Rev. 03 STP 3 & 4 Environmental Report · 2012-12-02 · Benefit-Cost Balance 10.4-3 STP 3 & 4...

STP 3 & 4 Environmental Report

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10.4 Benefit-Cost BalanceThe benefits and costs of constructing and operating STP 3 & 4 are discussed in the following paragraphs. The results are summarized in Table 10.4-2. Costs are given as monetary (where feasible), quantitative, or qualitative.

A summary of the overall benefits and costs of the proposed project and the comparison to the alternative sites, discussed in Section 9.3, is included in Subsection 10.4.3. Table 10.4-3 is a comparative summary of the benefits of the proposed project and alternative sites. Table 10.4-4 summarizes the unavoidable adverse impacts, which could be considered qualitative costs, of the proposed project at the alternative sites and measures and controls to reduce environmental impacts.

10.4.1 Benefits

10.4.1.1 Need for PowerSTP 3 & 4 will each generate approximately 1350 MWe for a total of approximately 2700 MW. Assuming a reasonably low capacity factor of 85%, the two-unit plant average annual electrical-energy generation would be more than 20,000,000 MW-hours. A reasonably high capacity factor of 93% would result in approximately 22,000,000 MW-hours of electricity.

As discussed in Chapter 8, the Electric Reliability Council of Texas (ERCOT), the independent system operator for the electric grid for most of Texas, conducted several studies on the need for power in their service area. ERCOT has concluded that a significant amount of new generation will be needed to meet the demand projected for 2016 along with maintaining the recommended minimum of a 12.5% reserve margin. The addition of 20,000,000 to 22,000,000 MW-hours of electricity from STP 3 & 4 will help maintain system reliability by increasing the availability of baseload power in the ERCOT distribution area.

10.4.1.2 Fuel Diversity and Natural Gas AlternativeFuel diversity is the key to affordable and reliable electricity. A diverse fuel mix protects electric companies and consumers from contingencies such as fuel unavailability, price fluctuations, and changes in regulatory practices (Reference 10.4-1). Experience has shown that it is risky to develop an over-reliance on any one energy source. In fact, a balanced energy portfolio has been the key to providing the United States with a growing supply of affordable electricity for the past 30 years (Reference 10.4-2).

Nuclear power plants currently generate approximately 20% of the electricity produced in the United States; however, recent electric generating capacity additions and projected future additions are primarily fueled by natural gas. According to the Department of Energy, an over-reliance on a single fuel source, like natural gas, is a potential vulnerability to the long-term security of our nation’s energy supply. Additional new nuclear plants must be built in the next decade to address increasing concerns over air quality and to ease the pressures on natural gas supply (Reference 10.4-3). The ERCOT region fuel mix consists of approximately 46.6% natural gas, 37.4% coal,

Benefit-Cost Balance 10.4-1


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13.6% nuclear, 1.9% renewables and 0.4% from other sources (actual energy production values June 2005–May 2006) (Reference 10.4-4).

Maintaining fuel diversity is a matter of maintaining a balance of fuel mixes. Relying heavily on natural gas is a matter of choosing a limited resource over more abundant fuels. High prices for natural gas and the intense, recurring periods of price volatility experienced over the last several years are influenced partly by demand for natural gas in the electric generation sector. Electric sector demand for natural gas is being driven by new gas-fired electric generating capacity built in the United States during the last decade. More than 90% of all new electric generating capacity added over the past 5 years is fueled with natural gas. New nuclear plants provide forward price stability that is not available from generating plants fueled with natural gas. The intense volatility in natural gas prices experienced over the last several years is likely to continue, and leaves the U.S. economy vulnerable. Although nuclear plants are capital-intensive to build, the operating costs are stable and dampen the volatility elsewhere in the electricity market (Reference 10.4-5). Natural gas has uses that are not readily served by other fuel choices, such as many manufacturing processes. This led the U. S. House of Representatives to prepare a Majority Staff report that included the following findings (Reference 10.4-6):

To enhance competitiveness and protect American jobs, natural gas must not be used for baseload electricity generation or for new generating capacity. Natural gas should be reserved for industries that use it as a feedstock or for primary energy—and cannot substitute for it by fuel-switching.

Nuclear energy must become the primary generator of base load electricity, thereby relieving the pressure on natural gas prices and dramatically improving atmospheric emissions.

For Texas, the addition of STP 3 & 4 would represent a step towards maintaining what has been a successful mix of fuel types for generating electricity. STP 3 & 4 will help maintain the state’s fuel diversity while meeting state and national goals of creating new baseload generation that would not use natural gas as a fuel.

10.4.1.3 Emissions Reduction Nuclear generation contributes considerable air quality benefits to the nation. Unlike electricity generated from coal and natural gas, nuclear energy does not result in significant emissions of air pollutants associated with global warming and climate change (e.g., nitrogen oxides, sulfur dioxide, carbon dioxide) or methyl mercury (Reference 10.4-6). Fossil fuel-fired power plants are responsible for 64% of the nation's sulfur dioxide emissions, 26% of nitrogen oxide emissions, 33% of mercury emissions, and 36% of man-made carbon dioxide emissions. The majority of the industry’s emissions are from coal-fired plants (Reference 10.4-6).

Subsections 9.2.3.1 and 9.2.3.2 analyze coal- and gas-fired alternatives to STP 3 & 4, respectively. Air emissions from these alternatives and for nuclear power are summarized in Table 10.4-1.

10.4-2 Benefit-Cost Balance


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Regardless of which reasonable alternative one compares to nuclear power, STP 3 & 4 would represent a substantial benefit in emission reduction, or emission avoidance, assuming that an alternative power source would be constructed if STP 3 & 4 were not.

10.4.1.4 Advantages of Nuclear PowerConcerns about global warming and climatic change make it reasonable to expect that, eventually, the United States may have to strictly curb emissions from fossil-fuel electric generation plants, conceivably to the point of displacing coal- and gas-fired electricity generation. If environmental policies greatly restrict carbon emissions in the future, the cost of building and operating fossil-fired plants could increase by 50% to 100%. Nuclear power is the only technology currently available that is a viable alternative to fossil-fired plants for baseload generation. In view of the time that it takes the nuclear industry to regain its capacity for construction and operation, the prospect of needing nuclear power to displace fossil-fuel power is one of the reasons for national concern with maintaining a nuclear energy capability (Reference 10.4-7).

10.4.1.5 Licensing CertaintyThe regulatory scheme used for the existing domestic fleet of nuclear plants, under 10 CFR 50, was a two-step process that resulted in much uncertainty about cost projections and, in retrospect, final costs. This was due, in part, to the fact that the industry had to make large capital investments before resolving licensing issues. In large, capital-intensive construction projects, interest costs are a significant portion of the project cost. Interest charges on overnight capital costs account for a quarter of the levelized cost of electricity from nuclear power plants (Reference 10.4-7). For existing nuclear power plants built under 10 CFR 50, licensing delays quickly and substantially increased project cost. Design changes, whether driven by licensing concerns, backfit requirements, or other factors, had similar effects.

STPNOC is looking to NRC’s 10 CFR 52 process to increase the licensing certainty of proposed new nuclear power plants. This new regulatory process provides for early resolution of siting issues before making large investments of financial capital and human resources in new plant design and construction, early resolution of issues on the environmental impacts of construction and operation of proposed reactors, the ability to bank sites on which nuclear plants may be located, and the facilitation of future decisions on whether to build new nuclear plants. STPNOC believes that the resultant increase in licensing certainty will reduce project costs by decreasing premiums associated with uncertainty and making licensing and construction scheduling more controllable and reliable.

10.4.1.6 Tax PaymentsDuring construction, STPNOC has projected the sales tax payments to be an estimated $23.9 million per unit, with $5.8 million due to Bay City and $18.1 million to the state of Texas over the construction period. These payments would provide a total of $11.6 million to Bay City over the 7-year construction period. Increased tax revenues will also come from housing purchases by the incoming workforce and increased school and property taxes as a result of the construction of STP 3 & 4.



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The owners will pay property taxes on STP 3 & 4 for the duration of the 40-year operating licenses. Matagorda County receives the taxes paid on STP property. As described in Subsection 5.8.2.2.2, over the life of the plant, annual franchise tax payments could range from approximately $4.7 million during initial operations to approximately $10 million in the last years of the 40-year operational life. Additional tax revenue would be generated from sales and use taxes, and property taxes on the operational workforce housing. Most people consider large tax payments a benefit to the taxing entity because they support the development of infrastructure which supports further economic development.

10.4.1.7 Local EconomySTP 3 & 4 would require a construction peak workforce of 5950 people. As presented in Subsection 4.4.2.2.1, 4790 direct and indirect jobs would be created during the 7-year construction period, assuming that 50% of the workforce migrates into the 50-mile region. The creation of these jobs could inject between $67.6 and $676 million dollars into the regional economy during the life of the construction project, reduce unemployment by up to 20%, and create business opportunities for housing and service-related industries.

STP 3 & 4 would require an operations workforce of about 888 people. Of this total, 444 are assumed to migrate into the 50-mile region. According to the multiplier effect, for every one job at STP 3 & 4, an estimated 1.47 jobs would be created within the 50-mile region. This would result in the creation of 653 additional indirect jobs. In total, 1097 new jobs within about a 50-mile radius of the plant (Subsection 5.8.2.2.1) would be created by the startup of STP 3 & 4 and would be maintained throughout the life of the plant. Many of these indirect jobs would be in the service sector and could be filled by local residents, lessening demands on social service agencies in addition to strengthening the economy. The economic multiplier effect of the increased spending by the direct and indirect labor force created as a result of STP 3 & 4 would increase the economic activity in the region, most noticeably in rural Matagorda County. The dollar impact of these jobs, as discussed in Subsection 5.8.2.2.1, would be approximately $45,000,000 to $55,000,000 per year within the 50-mile region.

Nuclear plants such as the STP site are estimated to generate approximately $350 million in total output for the local community and roughly $60 million in total labor income. The Southern States Energy Board reference (Reference 10.4-8) does not provide specific years for the $350 and $60 million figures, nor does it specifically identify the studies done by the NEI to support this statement. However, the Southern States Energy Board is considered a reliable source of data. STPNOC believes that the Southern States Energy Board’s interpretation of NEI’s data is correct, reasonably current (within the late 1990s to early 2000s), and useful for this analysis, even if the exact years of the data cannot be determined. These figures include direct effects, which reflect expenditures for goods, services, and labor, and indirect effects, which include subsequent spending in the community. The economic multiplier effect is one way of measuring indirect effects. Every dollar spent by nuclear plants results in the creation of an additional $1.13 in the community (Reference 10.4-8).



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10.4.1.8 Benefit SummaryTable 10.4-2 includes a summary of the benefits of the proposed project (STP Units 3 & 4). In ER Section 9.3, STPNOC evaluated environmental impacts of construction and operation of the proposed project at three alternative alternate sites (Red 2 greenfield site, Limestone Site, Allens Creek Ggreenfield Ssite, and Trinity 2 greenfield sitethe Malakoff Greenfield Site). Two additional sites were previously selected and evaluated as alternate sites in other revisions of the ER: Malakoff and Limestone. For completeness, similar evaluations of these two sites are also included in ER Section 9.3. Table 10.4-3 provides a comparison of the benefits of construction and operation of STP Units 3 & 4 to those at the three alternative alternate sites and the two additional sites.

10.4.2 Costs

10.4.2.1 Monetary–ConstructionIn evaluating the STP 3 & 4 monetary cost, STPNOC reviewed published literature, vendor information, internally generated general information, and internally generated site-specific information. There are many cost studies available in the literature with a wide range of cost estimates. STPNOC found four studies to be most authoritative due to the breadth and depth of their analyses and the fact that other studies tend to be based on them. These are:

University of Chicago Study (Reference 10.4-7)

MIT Study (Reference 10.4-9)

OECD Study (Reference 10.4-10)

EIA Study (Reference 10.4-11)

The phrase commonly used to describe the monetary cost of constructing a nuclear plant is “overnight capital cost.” The capital costs are those incurred during construction, when the actual outlays for equipment, construction, and engineering are expended. Overnight costs are exclusive of interest and include engineering, procurement, and construction costs, owner’s costs, and contingencies (Reference 10.4-7).

Estimates of overnight capital costs in 2003 dollars range from $1000 per kW to $2500 per kW (Reference 10.4-10), with $1500 to $2000 per kW being the most representative range (Reference 10.4-10). Many factors account for the range in cost, such as:

The specific technology used

Assumptions about the number of like-units built

Allocation of first-of-a-kind cost



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Site location

Parity adjustments to allow comparison between countries

Allowances for contingencies

The estimates are not based on nuclear plant construction experience in this country, which is more than 20 years old. Actual construction costs overseas have been less than the most recent domestic construction, suggesting that the industry has learned from the domestic experience. There is an assumption that the overseas experience can be applied domestically and the studies have found the overseas experience to be most applicable to estimating the cost of new domestic nuclear plant construction (Reference 10.4-7). There is reason to believe that new reactors will be less expensive to build than those currently in operation in the United States. Over the past 30 years, there have been technological advances in construction techniques that would reduce costs. In addition, simplified, standardized, and pre-approved designs clearly result in cost savings. The newer plants have fewer components and therefore would be less expensive. Because the designs of advanced reactors are pre-approved by the NRC, much of the design work will be done before construction begins, and this will lower the costs (Reference 10.4-11)

The four studies tend to support $2000 per kW as a reasonable high-end overnight capital cost estimate. The $2500 value is based on construction in Japan. While no explanation is offered as to why the cost in Japan is so high in this study, it is reasonable to suggest that contributing factors are the high cost of living in Japan (labor accounts for more than 20% of costs) and difficulties associated with construction on an island. Construction experience with ABWR plants worldwide will be used to minimize First of a Kind Engineering (FOAKE) costs discussed in the studies. For the purposes of analysis in this environmental report, to avoid understating the cost, STPNOC has chosen to use the $2000 per kW value (year 2003 dollars). Together with an installed capacity of 2700 MWe, $2000 per kW results in a STP 3 & 4 construction cost of approximately $5.4 billion in 2003 dollars.

10.4.2.2 Monetary–OperationThe four studies discussed in Subsection 10.4.2.1 show a wide range of operation cost estimates. Operation costs are frequently expressed as levelized cost of electricity, which is the price at the busbar needed to cover operating costs and annualized capital costs. The levelized cost of a project is equivalent to the constant dollar (“real”) price of electricity that would be necessary over the life of the plant to cover all operating expenses, interest, and principal repayment obligations on project debt, taxes, and provide an acceptable return to equity investors over the economic life of the project (Reference 10.4-9). Overnight capital costs account for a third of the levelized cost, and interest costs on the overnight costs account for another 25%. Levelized cost estimates range from $36 to $65 per MW-hour (3.6 to 6.5 cents per kW hour) (Reference 10.4-7). Factors affecting the range include choices for discount rate, construction duration, plant lifespan, capacity factor, cost of debt and equity and split between debt and equity financing, depreciation time, tax rates, and premium for uncertainty. It is concluded that $65 per MW-hour (6.5 cents per kW-hour) is a



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reasonably conservative high-end levelized cost of electricity for nuclear generation. This includes nuclear fixed operation and maintenance and fuel costs of approximately $60,000 per MW-hr ($60 per kW – hour) and $4.35 per MW-hr (0.435 cents per kW-hour), respectively. Decommissioning costs have been estimated for one reactor at STP to be approximately $517 million (in year 2006 dollars), consistent with the formula established by the NRC in 10 CFR 50.75.

In addition to nuclear plant costs, the four studies provide coal- and gas-fired generation costs for comparison to nuclear generation costs. One study shows nuclear costs competitive with coal and gas (Reference 10.4-10). The other studies show nuclear costs that exceed those of coal and gas. The MIT study indicates that new nuclear power is not economically competitive but goes on to suggest steps that the government could take to improve nuclear economic viability (Reference 10.4-9). Since this study, the government has undertaken those steps as follows:

U. S. Department of Energy has provided financial support for plants testing the U. S. NRC licensing processes for early site permits and combined operating licenses.

The U. S. government has endorsed nuclear energy as a viable carbon-free generation option.

The Energy Policy Act of 2005 instituted a production tax credit for the first advanced reactors brought on line in the United States.

STPNOC has concluded that the government steps have negated the MIT study’s conclusion that new nuclear power is not economically competitive.

10.4.2.3 Environmental and MaterialSection 10.1 identifies unavoidable adverse impacts of the proposed action (i.e., impacts after consideration of proposed mitigation actions), and Section 10.2 identifies irretrievable commitments of resources. Table 10.4-2 includes these costs. The qualitative costs that are unavoidable impacts to the environment are in the general categories of land and water.

Environmental impacts of construction and operation of the proposed project at three alternativealternate sites (Red 2 greenfield site, Limestone site, Allens Creek Ggreenfield site, and the Malakoff GreenfieldTrinity 2 greenfield site) are discussed in ER Section 9.3. Two additional sites were previously selected and evaluated as alternate sites in other revisions of the ER: Malakoff and Limestone. For completeness, similar evaluations of these two sites are also included in ER Section 9.3. Table 10.4-4 describes the impacts of construction and operation of the proposed project at the three alternativealternate sites and the two additional sites, and provides details regarding potential mitigation, and the unavoidable adverse impacts after mitigation has been considered.

Consistent with Regulatory Guide (RG) 4.2, each site was evaluated using preliminary publicly available and reconnaissance level information. Consequently, the costs of



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mitigation must be estimatedare not easy to determine at this time. Many costs would be built into the project design (e.g., scheduling to ensure that construction is completed in the shortest possible time; using construction best management practices to limit erosion, fugitive dust, runoff, spills, and air emissions; providing first aid stations at the construction site). Others Other cost categories would be dependent rely on communications between STPNOC and the affected communities to mitigate the impacts and associated costs.

10.4.3 SummaryTable 10.4-3 summarizes benefits of the proposed action in comparison to the benefits of constructing the units at alternativealternate sites, as identified in Section 9.3. Table 10.4-4 summarizes the environmental costs (adverse impacts) associated with construction and operation of the proposed project at the three alternativealternate sites. Most of the impacts associated with construction of the proposed project, particularly operational impacts, would be the similar regardless of the location of the site. The impacts that are similar are stated as such and can be found in detail in Section 10.1.

10.4.4 References10.4-1 “Fuel Diversity,” Edison Electric Institute 2006. Available at http://www.

eei.org/industry_issues/energy_infrastructure/fuel_diversity/index.htm, accessed March 19, 2007.

10.4-2 “Fuel Diversity,” Center for Energy and Economic Development 2006. Available at http://www.ceednet.org/ceed/index.cfm?cid=7500,7583, accessed March 19, 2007.

10.4-3 “Nuclear Power 2010,” U.S. Department of Energy, available at http://nuclear.energy.gov/np2010/neNP2010a.html, accessed March 22, 2007.

10.4-4 “Electric Reliability and Resource Adequacy Update,” Electric Reliability Council of Texas July 13, 2006. Available at http://www.ercot.com/news/presentations/2006/index.html, accessed August 7, 2007.

10.4-5 “Nuclear Energy’s Role in Reducing Demand for Natural Gas Through Diversification of Energy Sources Used for Electricity Generation,” Nuclear Energy Institute 2005, January 24, 2005, responding to questions posed by the Senate Energy and Natural Resource Committee for its Natural Gas Supply and Demand Conference, Quotation from Report of the President’s National Energy Policy Development Group, May 2001. Available at http://www.nei.org/documents/White_Paper_Reducing_Demand_Natural_Gas_1-24-05.pdf, accessed March 19, 2007.

10.4-6 “U. S. House of Representatives, Securing America’s Energy Future, Majority Staff Report to Committee on Government Reform and Subcommittee on Energy and resources,” Nuclear Energy Institute 2005,



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May 8, 2006. Available at http://www.nei.org/documents/House_Energy_Report_5-8-06.pdf, accessed March 19, 2007.

10.4-7 “The Economic Future of Nuclear Power; A Study Conducted at The University of Chicago,” University of Chicago 2004, August 2004. Available at http://np2010.ne.doe.gov/reports/NuclIndustryStudy.pdf, accessed March 19, 2007.

10.4-8 “Nuclear Energy: Cornerstone of Southern Living, Today and Tomorrow,” Southern States Energy Board 2006. Available at http://np2010.ne.doe.gov/reports/NuclIndustryStudy.pdf, accessed March 19, 2007.

10.4-9 “The Future of Nuclear Power, An Interdisciplinary MIT Study,” Massachusetts Institute of Technology 2003. Available at http://web.mit.edu/nuclearpower/, accessed March 19, 2007.

10.4-10 International Energy Agency, Organization for Economic Co-operation and Development, and International Energy Agency, Projected Costs of Generating Electricity; 2005 Update, available at http://www.iea/org/Textbase/publications/free_new_Desc.asp?PUBS_ID=1472, accessed March 23, 2007.

10.4-11 “Annual Energy Outlook 2004,”Energy Information Administration. Available at http://www.eia.doe.gov/oiaf/archive/aeo04/pdf/0383(2004).pdf, accessed April 2, 2007.



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Table 10.4-1 Avoided Air Pollutant Emissions

Pollutant

Coal Emissions(tons per year/2700 MWe) [1]

[1] Based on constructing two units to replace the power produced by STP 3 & 4 (gross power) (see Section 9.2).

Gas Emissions(tons per year/2700 MWe) [1]

Nuclear Emissions

(tons per year) [2]

[2] Nuclear power plants have emergency and auxiliary equipment that is fossil-fuel-fired and emits pollutants. The equipment is generally operated only for testing purposes for less than 250 hours per year. As such, the emissions are considered minimal and are excluded here.

Sulfur dioxide 2,900 41 0

Nitrogen oxides 2,000 680 0

Carbon monoxide 2,800 141 0

Carbon dioxide 27,000,000 6,900,000 0

Mercury 0.46 0 0

Particulates having a diameter of less than 10 microns

50 0 0

Particulates having a diameter of less than 2.5 microns

13 119 0



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Table 10.4-2 Benefit-Cost Summary

Benefit-Cost Category Description

Benefits

Electricity generated 20,000,000 (85% capacity) to 22,000,000 (93% capacity) MW-hours per year

Generating capacity 2700 MW (gross)

Fuel diversity and natural gas alternative Nuclear option to coal- and gas-fired baseload generation

Emissions reduction Avoidance of 41 to 2900 tons per year sulfur dioxide Avoidance of 680 to 2000 tons per year nitrogen oxidesAvoidance of 141 to 2800 tons per year carbon monoxideAvoidance of 6,900,000 to 27,000,000 tons per year carbon dioxideAvoidance of 13 to 119 tons per year fine particulates

Advanced Light Water Reactor development Maintaining domestic nuclear technology capability as hedge against possible need to control global warming

Tax payments (construction and operation) Projected sales tax payments on construction goods at an estimated $23.9 million per unit, with $5.8 million due to Bay City and $18.1 million to the State of Texas over the 7 yr construction period. $4.7 to $5.4 million in franchise taxes in 2015, the first year of operation for STP 3, and an estimated $8.6 to $10.0 million in 2016, when STP 4 comes on line, and in subsequent years.

Socioeconomics 2975 direct and 1815 indirect jobs added to local economy during construction.444 direct jobs and 653 indirect jobs added to local economy during operation.The creation of jobs during construction could inject between $67.6 and $676 million dollars into the regional economy during the life of the construction project, reduce unemployment by up to 20 percent, and create business opportunities for housing and service-related industries. The operations workforce impact on the regional economy would be estimated at between approximately $45,000,000 to $55,000,000 per year in the 50-mile region.



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Costs

Construction cost $5.4 billion dollars (overnight capital cost)

Operating cost 6.5 cents per kW-hour (levelized cost of electricity)$60 per kW fixed O&M cost0.435 cents per kW hour nuclear fuel cost$517 million for decommissioning of one reactor

Land use 90 acres (excluding the Main Cooling Reservoir [MCR]) occupied on long-term basis by STP 3 & 4 and associated infrastructure. On-site landfill may restrict future uses of that land.

Total annual land requirements for fuel cycle support would be 21 permanently committed acres and 160 temporarily committed acres per unit.

Hydrology - Groundwater use During operations, the expected average rate of groundwater removal for STP 3 & 4 would be 1077 gpm for normal operations and 3935 gpm for maximum (peak) operations. During the construction period, dewatering of shallow, water-table aquifer would have only small, local affect.

Hydrology - Surface water use The expected rate of withdrawal of Colorado River water to replace water losses from the MCR will be 42,604 gallons per minute (gpm) for normal two-unit operations and 44,779 gpm during maximum (peak) use operations

Material (per reactor building) 240,000 yards concrete13,000 tons structural steel2,500,000 linear feet cable for reactor building6,500,000 linear feet of cable for a single reactor55,000 feet of piping having diameter >2.5 inches17,000 metric tons of uranium

Table 10.4-2 Benefit-Cost Summary (Continued)

Benefit-Cost Category Description


Benefit-C

ost Balance

10.4-13

STP 3 & 4

Environmental R

eport

B itional Site #1 Additional Site #2

posed Project Malakoff Site (Greenfield)

Proposed Project at Limestone Site

(Greenfield)

EG

GC

D ng the 7-year truction period,

itional property ill be paid to

derson County the state will an increase in s tax revenues.

During the 7-year construction period, additional property tax will be paid to Freestone County and the state will see an increase in sales tax revenues.

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Table 10.4-3 Benefits of the Proposed Project

enefit CategoryProject as Proposed Alternate Site #1 Alternate Site #2 Alternate Site #3 Add

Description of Project STP Units 3 & 4

Proposed Project at Red 2 Site (Greenfield)

Proposed Project at Allens Creek Site (Greenfield)

Proposed Project at Trinity 2 Site

(Greenfield)

Proat

Monetary Benefits

lectricity enerated

The following description applies to all proposed/alternate/additional sites.20,000,000 to 22,000,000 MW-hours per year

enerating apacity

The following description applies to all proposed/alternate/additional sites.2,700 MW

State and Local Tax Payments

uring Construction During the 7-year construction period for STP 3&4, NRG would not pay franchise tax, but would pay additional property taxes, and state will see an increase in sales tax revenues. Projected sales tax payments on construction goods at an estimated $23.9 million per unit, with $5.8 million due to Bay City and $18.1 million to the State of Texas.

During the 7-year construction period, additional property tax will be paid to Fannin County and the state will see an increase in sales tax revenues.

During the 7-year construction period, additional property tax will be paid to Austin County and the state will see an increase in sales tax revenues.

During the 7-year construction period, additional property tax will be paid to Freestone County and the state will see an increase in sales tax revenues.

Duriconsaddtax wHenandsee sale

10.4-14B

enefit-Cost B

alance

STP 3 & 4

Environmental R

eport

D ng operation, ayments for

2 new units will ade to

derson County.

During operation, tax payments for the 2 new units will be made to Freestone County.

D The creation of jobs during during the life of the construction

D impact on the regional economy is

F

ER oxides; 141 to 2,800 tons per year

r year fine particulates.

AWD

trol global warming.

B itional Site #1 Additional Site #2

posed Project Malakoff Site (Greenfield)


(Greenfield)

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uring Operations $4.7 to $5.4 million in franchise taxes in 2015, the first year of operation for STP 3, and an estimated $8.6 to $10.0 million in 2016, when STP 4 comes on line, and in subsequent years.

During operation, tax payments for the 2 new units will be made to Fannin County.

During operation, tax payments for the 2 new units will be made to Austin County.

During operation, tax payments for the 2 new units will be made to Freestone County.

Duritax pthe be mHen

Effects on Regional Productivity

uring Construction The following description applies to all proposed/alternate/additional sites.5,950 direct jobs (2,975 would in-migrate) and 1,815 indirect jobs added to local economy.construction could inject between $67.6 and $676 million dollars into the regional economyproject.

uring Operation The following description applies to all proposed/alternate/additional sites.888 direct jobs and 1,305 indirect jobs added to local economy. The operations workforceestimated at between $45,090,864 to $55,064,880 per year.

Technical and Other Non-Monetary Benefits

uel Diversity The following description applies to all proposed/alternate/additional sites.Nuclear option to coal- and gas-fired baseload generation.

missions eduction

The following description applies to all proposed/alternate/additional sites.Avoidance of 41 to 2,900 tons per year sulfur dioxide, 680 to 2,000 tons per year nitrogen carbon monoxide; 6,900,000 to 27,000,000 tons per year carbon dioxide; 13 to 119 tons pe

dvanced Light ater Reactor evelopment

The following description applies to all proposed/alternate/additional sites.Maintaining domestic nuclear technology capability as hedge against possible need to con

Table 10.4-3 Benefits of the Proposed Project (Continued)

enefit CategoryProject as Proposed Alternate Site #1 Alternate Site #2 Alternate Site #3 Add

Description of Project STP Units 3 & 4


Proposed Project at Allens Creek Site (Greenfield)

Proposed Project at Trinity 2 Site

(Greenfield)

Proat

Benefit-C

ost Balance

10.4-15

STP 3 & 4

Environmental R

eport

t Alternate Sitesl Site #1 Additional Site #2

Droject at f Site field)


(Greenfield)

La t – ,100 acres

d be

cluding a cooling 2,300-acres n existing

access ), rail spur and makeup e (42 acres) ailable for

ure – plicable s, zoning irements ngineering ctices (Best

ractices or nt ontrols

ormwater tion Plan

as weekly ections,

of runoff estrict

Adverse Impact – Approximately 4,000 acres of the site would be disturbed during construction (including construction of a cooling reservoir up to 3,200-acres in size, based on existing topography).Land devoted to construction of makeup water intake line (582 acres) would not be available for other uses.Mitigation Measure – Comply with applicable laws, regulations, zoning and permit requirements and use good engineering construction practices (Best Management Practices or BMP). Implement environmental controls required in a Stormwater Pollution Protection Plan (SWPPP) such as weekly compliance inspections, documentation of runoff controls, etc. Restrict construction to designated areas within the site. Re-

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Table 10.4-4 Unavoidable Adverse Environmental Impacts of Proposed Project aCategory Alternate Site #1 Alternate Site #2 Alternate Site #3 Additiona

escription of Project


Proposed Project at Allens Creek Site

(Greenfield)

Proposed Project at Trinity 2 Site (Greenfield)

Proposed PMalakof(Green

Construction-Relatednd Use Adverse Impact –

Approximately 2,500 acres of the site would be disturbed during construction (including construction of a cooling reservoir up to 1,700-acres in size, based on existing topography).Land devoted to construction of access roads (20 acres), rail spur line (26 acres), and makeup water intake line (35 acres) would not be available for other uses.Mitigation Measure – Comply with applicable laws, regulations, zoning and permit requirements and use good engineering construction practices (Best Management Practices or BMP). Implement environmental controls required in a Stormwater Pollution Protection Plan (SWPPP) such as weekly compliance inspections, documentation of runoff controls, etc. Restrict

Adverse Impact – Approximately 10,300 acres of the site would be disturbed during construction. This includes 9,500 acres (cumulative) for a cooling water reservoir to support the nuclear plant combined with a water supply reservoir currently planned for the same location by the Brazos River Authority to supply future water supply needs of the City of Houston; the proposed reservoir size is based in part on existing topography.Land devoted to construction of access roads (11 acres), rail spur line (5 acres), and makeup water intake line (36 acres) would not be available for other uses.Mitigation Measure – Comply with applicable laws, regulations, zoning and permit requirements and use good engineering construction practices (Best

Adverse Impact – Approximately 2,500 acres of the site would be disturbed during construction (including construction of a cooling reservoir up to 1,700-acres in size, based on existing topography).Land devoted to construction of access roads (27 acres), rail spur line (120 acres), and makeup water intake line (36 acres), would not be available for other uses.Mitigation Measure – Comply with applicable laws, regulations, zoning and permit requirements and use good engineering construction practices (Best Management Practices or BMP). Implement environmental controls required in a Stormwater Pollution Protection Plan (SWPPP) such as weekly compliance inspections, documentation of runoff controls, etc. Restrict

Adverse ImpacApproximately 3of the site wouldisturbed duringconstruction (inconstruction of reservoir up to in size, based otopography).Land devoted toconstruction of roads (29 acresline (16 acres), water intake linwould not be avother uses.Mitigation MeasComply with aplaws, regulationand permit requand use good econstruction praManagement PBMP). Implemeenvironmental crequired in a StPollution Protec(SWPPP) suchcompliance inspdocumentation controls, etc. R

10.4-16B

enefit-Cost B

alance

STP 3 & 4

Environmental R

eport

La(c

designated site. Re-vegetate mporary rposes. id wetlands ssible h quality

identified on l fencing s during protect tent he area. ntour turbed

ordance with tions.verse

Impacts – exclusion

excluded cultural and . Small to

oidable s would be

the plant, nal size of xtent to areas are

contour and re-vegetate land used for temporary construction purposes. Identify and avoid wetlands to the extent possible (although no high quality wetlands were identified on the site). Install fencing around wetlands during construction to protect against inadvertent excursion into the area. Stabilize and contour permanently disturbed locations in accordance with design specifications.Unavoidable Adverse Environmental Impacts – Areas within the exclusion zone would be excluded from future agricultural and recreational use. Small unavoidable adverse impacts would be expected during construction within immediate site footprint (since most of area has been previously disturbed); small to moderate adverse impacts at reservoir site depending on final size of reservoir and extent to which forested areas are

rnate Sites (Continued)l Site #1 Additional Site #2



(Greenfield)

Rev. 03

nd Use ontinued)

construction to designated areas within the site. Re-contour and re-vegetate land used for temporary construction purposes. Identify and avoid wetlands to the extent possible (although no high quality wetlands were identified on the site). Install fencing around wetlands during construction to protect against inadvertent excursion into the area. Stabilize and contour permanently disturbed locations in accordance with design specifications.Unavoidable Adverse Environmental Impacts – Areas within the exclusion zone would be excluded from future agricultural and recreational use. Small to moderate unavoidable adverse impacts would be expected during construction of the plant.

Management Practices or BMP). Implement environmental controls required in a Stormwater Pollution Protection Plan (SWPPP) such as weekly compliance inspections, documentation of runoff controls, etc. Restrict construction to designated areas within the site. Re-contour and re-vegetate land used for temporary construction purposes. Identify and avoid wetlands to the extent possible (high quality wetlands would be affected by reservoir construction). Install fencing around wetlands during construction to protect against inadvertent excursion into the area. Stabilize and contour permanently disturbed locations in accordance with design specifications.Unavoidable Adverse Environmental Impacts – Areas within the exclusion zone (if necessary) would be excluded from future agricultural and recreational

construction to designated areas within the site. Re-contour and re-vegetate land used for temporary construction purposes. Identify and avoid wetlands to the extent possible (high quality wetlands would be impacted by reservoir construction). Install fencing around wetlands during construction to protect against inadvertent excursion into the area. Stabilize and contour permanently disturbed locations in accordance with design specifications.Unavoidable Adverse Environmental Impacts – Areas within the exclusion zone would be excluded from future agricultural and recreational use. Small to moderate unavoidable adverse impacts would be expected during construction of the plant.

construction to areas within thecontour and re-land used for teconstruction puIdentify and avoto the extent po(although no higwetlands were the site). Instalaround wetlandconstruction to against inadverexcursion into tStabilize and copermanently dislocations in accdesign specificaUnavoidable AdEnvironmental Areas within thezone would be from future agrirecreational usemoderate unavadverse impactexpected duringconstruction of depending on fireservoir and ewhich forested affected.

Table 10.4-4 Unavoidable Adverse Environmental Impacts of Proposed Project at AlteCategory Alternate Site #1 Alternate Site #2 Alternate Site #3 Additiona




(Greenfield)



Benefit-C

ost Balance

10.4-17

STP 3 & 4

Environmental R

eport

La(c

affected.

La(T

t – Three lt es would be in a new orridor. new e corridors es) would t-of-way, r in an area

arily of oodlands.ure – Where corridors ing rights-of-acts to , reservoirs If required, tudy that unt mpacts.

ns of federal ies into

decisions. idors to

Adverse Impact – Three new 345-kilovolt transmission lines would be required in a new 200-foot wide corridor. Construction of new transmission lines corridors (total of 24 acres) would be required.Mitigation Measure – The proposed site is approximately 1 mile east of the existing Limestone power plant where multiple 345 kV connections exist. Once at the Limestone plant, it is assumed that the lines could parallel existing ROW (with potential need for expansion). Minimal impact given the short distance between site and transmission tie-in, and area has been previously disturbed. Additional siting study not expected to be required. Restrict




(Greenfield)

Rev. 03

nd Use ontinued)

use. Moderate to large unavoidable adverse impacts would be expected during construction of the plant (considering cumulative impacts from planned construction of water supply reservoir at same location).

nd Use ransmission)

Adverse Impact – Three new 345-kilovolt transmission lines would be required in a new 200-foot wide corridor. Construction of new transmission line corridor (120 acres) would occur in an area consisting primarily of pasture and crops.Mitigation Measure – Where possible select corridors that follow existing rights-of-way. Avoid impacts to streams, ponds, reservoirs and wetlands. If required, conduct siting study that takes into account environmental impacts. Incorporate recommendations of federal and state agencies into route selection decisions. Route new corridors to avoid state or federal parks, and critical or sensitive

Adverse Impact – Three new 345-kilovolt transmission lines would be required, each in a new 200-foot wide corridor. Construction of new transmission line corridors (2,060 acres) would be required.Mitigation Measure – Where possible select corridors that follow existing rights-of-way. Avoid impacts to streams, ponds, reservoirs and wetlands. If required, conduct siting study that takes into account environmental impacts. Incorporate recommendations of federal and state agencies into route selections. Site new corridors to avoid state or federal parks, and critical or sensitive habitats or species as much as possible.

Adverse Impact – Three new 345-kilovolt transmission lines would be required in a new 200-foot wide corridor. Construction of new transmission line corridor (120 acres) would occur in area consisting primarily of open pasture and woodland.Mitigation Measure – Where possible select corridors that follow existing rights-of-way. Avoid impacts to streams, ponds, reservoirs and wetlands. If required, conduct siting study that takes into account environmental impacts. Incorporate recommendations of federal and state agencies into route selection decisions. Route new corridors to avoid state or federal parks, and critical or sensitive

Adverse Impacnew 345-kilovotransmission linrequired, each 200-foot wide cConstruction oftransmission lin(total of 970 acrrequire new righand would occuconsisting primfarmland and wMitigation Measpossible select that follow existway. Avoid impstreams, pondsand wetlands. conduct siting stakes into accoenvironmental iIncorporate recommendatioand state agencroute selection Route new corr





(Greenfield)



10.4-18B

enefit-Cost B

alance

STP 3 & 4

Environmental R

eport

La(T(c

deral parks, ensitive ies as much strict

tivities to rridors and Before site nduct and ys and pecific measures. applicable s, permits, ents, good vironmental nd ctices.verse

Impacts – oidable s of new es on land ssumption ld be in

sturbed

construction activities to transmission corridors and access roads. Sensitive resources not expected to be found within the corridors; however, before site disturbance, conduct archaeological and ecological surveys and determine site-specific erosion control measures. Comply with all applicable laws, regulations, permits, zoning requirements, good engineering, environmental management, and construction practices.Unavoidable Adverse Environmental Impacts – Small unavoidable adverse impacts of new transmission lines on land use.

LaM

space would be consumed for disposal of




(Greenfield)

Rev. 03

nd Use ransmission) ontinued)

habitats or species as much as possible. Restrict construction activities to transmission corridors and access roads. Before site disturbance, conduct archaeological and ecological surveys and determine site-specific erosion control measures. Comply with all applicable laws, regulations, permits, zoning requirements, good engineering, environmental management, and construction practices.Unavoidable Adverse Environmental Impacts – Small unavoidable adverse impacts of new transmission lines on land use.

Restrict construction activities to transmission corridors and access roads. Before site disturbance, conduct archaeological and ecological surveys and determine site-specific erosion control measures. Comply with all applicable laws, regulations, permits, zoning requirements, good engineering, environmental management, and construction practices.Unavoidable Adverse Environmental Impacts – Moderate unavoidable adverse impacts of new transmission lines on land use.

habitats or species as much as possible. Restrict construction activities to transmission corridors and access roads. Before site disturbance, conduct archaeological and ecological surveys and determine site-specific erosion control measures. Comply with all applicable laws, regulations, permits, zoning requirements, good engineering, environmental management, and construction practices.Unavoidable Adverse Environmental Impacts – Small unavoidable adverse impacts of new transmission lines on land use.

avoid state or feand critical or shabitats or specas possible. Reconstruction actransmission coaccess roads. disturbance, coarchaeological ecological survedetermine site-serosion control Comply with alllaws, regulationzoning requiremengineering, enmanagement, aconstruction praUnavoidable AdEnvironmental Moderate unavadverse impacttransmission linuse, based on athat portion woupreviously undirights-of-way.

nd Use (Waste anagement)

The following description applies to all alternate/additional sites.Adverse Impact – Construction debris would be disposed in onsite and/or offsite landfills.Mitigation Measure – Use waste minimization to reduce volume of debris.Unavoidable Adverse Environmental Impacts – Small unavoidable adverse impacts to land use. Landfillconstruction debris and would not be available for disposal of other wastes.





(Greenfield)



Benefit-C

ost Balance

10.4-19

STP 3 & 4

Environmental R

eport

LaRe

aeological surveys. Develop and urces.l, or paleontological resources. Small

HyW n.

quirements. Practice water conservation

e through a permitted TPDES outfall.

ways.PPP); conduct monitoring as required by

h erosion control devices and after

surface water.aks. Prepare and implement Spill ng petroleum products that are equipped




(Greenfield)

Rev. 03

nd Use (Cultural sources)

The following description applies to all alternate/additional sites.Adverse Impact – Potential to disturb buried historic, archaeological, or paleontological resources.Mitigation Measure – Consult State Historic Preservation Officer. Before site disturbance, conduct archimplement procedures that include actions to protect or recover cultural, historic, or paleontological resoUnavoidable Adverse Environmental Impacts – Potential for destruction of unanticipated historic, culturaunavoidable adverse impacts to cultural resources from construction.

drology and ater Use

The following description applies to all alternate/additional sites.Adverse Impact – Construction would require up to 1,200 gpm of groundwater for use during constructioMitigation Measure – Comply with applicable water rights requirements, laws, regulations, and permit reas practical. No other measures or controls would be necessary.Unavoidable Adverse Environmental Impacts – Small unavoidable adverse impacts.

Adverse Impact – Install excavation dewatering wells for use during construction.Mitigation Measure – Install drainage system to divert dewatering runoff to settling basin before dischargFollow best management practices for erosion control.Unavoidable Adverse Environmental Impacts – Small unavoidable adverse impacts.

Adverse Impact – Construction along river banks or stream banks could introduce sediments into waterMitigation Measure – Develop and implement a construction Storm Water Pollution Prevention Plan (SWthe storm water general permit. Stabilize upslope areas and adjacent to shoreline construction sites witconstruction, re-seed the areas.Unavoidable Adverse Environmental Impacts – Small unavoidable adverse impacts.

Adverse Impact – Use of heavy equipment introduces the possibility of petroleum spills that could enterMitigation Measure – Use good maintenance practices to maintain equipment, and prevent spills and lePrevention Control and Countermeasures (SPCC) Plan for construction activities. Restrict activities usiwith spill containment.Unavoidable Adverse Environmental Impacts – Small unavoidable adverse impacts.





(Greenfield)



10.4-20B

enefit-Cost B

alance

STP 3 & 4

Environmental R

eport

Aq – Reservoir uld inundate atic habitat treams in r Creek and Some high are in the

edging along oreline, ake cause the

ganisms and adation of er, no aquatic nd in nty.

ne and rail uld require erbodies or rs within

d would of some temporary habitat.ure – Install

store ment and ea designed ng in atercourses; r retention ed; re-seed

Adverse Impact – Reservoir construction would inundate the natural aquatic habitat along existing streams in the area (Red Hollow Channel and Lynn Creek). Some high quality wetlands along Lynn Creek are in the potential reservoir area. Construction/dredging along the reservoir shoreline, including an intake structure, would cause the loss of some organisms, and temporary degradation of habitat. However, no Federally listed aquatic species are found in Freestone County/Trinity River. Construction of water intake line could require crossing of waterbodies and would cause temporary degradation of habitat.Mitigation Measure – Install cofferdam and store excavated sediment and soils in spoils area designed to prevent loading in wetlands and watercourses; use storm water retention basins as needed; re-seed spoils area after construction. Develop and




(Greenfield)

Rev. 03

uatic Ecology Adverse Impact – Reservoir construction would inundate the natural aquatic habitat along existing streams in the area (e.g., Bushy Creek). Construction/ dredging along the reservoir shoreline, including an intake structure, would cause the loss of some organisms, and temporary degradation of habitat. However, no Federally listed aquatic species are found in Fannin County/Red River. Transmission line and rail construction could require crossing of waterbodies or erection of towers within waterbodies and would cause the loss of some organisms and temporary degradation of habitat.Mitigation Measure – Install cofferdam and store excavated sediment and soils in spoils area designed to prevent loading in wetlands and watercourses; use storm water retention basins as needed; re-seed spoils area after construction. Develop and implement a construction

Adverse Impact – Reservoir construction would inundate the natural aquatic habitat along existing streams in the area (e.g., Allens Creek). Construction/ dredging along the reservoir shoreline, including an intake structure, would cause the loss of some organisms, and temporary degradation of habitat. There are no Federally listed aquatic species in Austin County; however, a candidate species (sharpnose shiner) has potential to occur in the Brazos River. Transmission line and rail construction could require crossing of waterbodies or erection of towers within waterbodies and would cause the loss of some organisms and temporary degradation of habitat.Mitigation Measure – Install cofferdam and store excavated sediment and soils in spoils area designed to prevent loading in wetlands and watercourses; use storm water retention

Adverse Impact – Reservoir construction would inundate the natural aquatic habitat along existing streams in the area (e.g., Tehuacana Creek and Big Brown Creek). Construction/ dredging along the reservoir shoreline, including an intake structure, would cause the loss of some organisms, and temporary degradation of habitat. However, no Federally listed aquatic species are found in Freestone County/Trinity River. Transmission line and rail construction could require crossing of waterbodies or erection of towers within waterbodies and would cause the loss of some organisms and temporary degradation of habitat.Mitigation Measure – Install cofferdam and store excavated sediment and soils in spoils area designed to prevent loading in wetlands and watercourses; use storm water retention basins as needed; re-seed spoils area after

Adverse Impactconstruction wothe natural aqualong existing sthe area (CedaWalnut Creek).quality wetlandssite area. Construction/drthe reservoir shincluding an intstructure, wouldloss of some ortemporary degrhabitat. HowevFederally listedspecies are fouHenderson CouTransmission liconstruction cocrossing of waterection of towewaterbodies ancause the loss organisms and degradation of Mitigation Meascofferdam and excavated sedisoils in spoils arto prevent loadiwetlands and wuse storm watebasins as need





(Greenfield)



Benefit-C

ost Balance

10.4-21

STP 3 & 4

Environmental R

eport

Aq(c

r evelop and nstruction ct quired by general e upslope ent to

ruction sites ntrol devices uction, re-

and water sitive areas plan utes to ts to ater bodies ssed; use ifically rk around

treams, ontrols, and ractices to ts to aquatic e e nduct ys and pecific measures. tial for a new e to degrade

implement a construction SWPPP; conduct monitoring as required by the storm water general permit. Stabilize upslope areas and adjacent to shoreline construction sites with erosion control devices and after construction, re-seed the areas.Avoid wetlands and water bodies and sensitive areas when possible; plan water intake pipeline routes to minimize impacts to wetlands and water bodies that must be crossed; use equipment specifically designed for work around wetlands and streams, install erosion controls, and implement best management practices to minimize impacts to aquatic systems. Before water intake line construction, conduct ecological surveys and determine site-specific erosion control measures. If there is potential for construction of new pipeline to degrade habitat of a listed aquatic species, work closely with the state agency to develop a




(Greenfield)

Rev. 03

uatic Ecology ontinued)

SWPPP; conduct monitoring as required by the storm water general permit. Stabilize upslope areas and adjacent to shoreline construction sites with erosion control devices and after construction, re-seed the areas.Avoid wetlands and water bodies and sensitive areas when possible; plan transmission routes to minimize impacts to wetlands and water bodies that must be crossed; use equipment specifically designed for work around wetlands and streams, install erosion controls, and implement best management practices to minimize impacts to aquatic systems. Before transmission line construction, conduct ecological surveys and determine site-specific erosion control measures. If there is potential for construction of a new transmission line to degrade habitat of a listed aquatic species, work closely with the state agency to develop

basins as needed; re-seed spoils area after construction. Develop and implement a construction SWPPP; conduct monitoring as required by the storm water general permit. Stabilize upslope areas and adjacent to shoreline construction sites with erosion control devices and after construction, re-seed the areas.Avoid wetlands and water bodies and sensitive areas when possible; plan transmission routes to minimize impacts to wetlands and water bodies that must be crossed; use equipment specifically designed for work around wetlands and streams, install erosion controls, and implement best management practices to minimize impacts to aquatic systems. Before transmission line construction, conduct ecological surveys and determine site-specific erosion control measures. If there is potential for construction of a new

construction. Develop and implement a construction SWPPP; conduct monitoring as required by the storm water general permit. Stabilize upslope areas and adjacent to shoreline construction sites with erosion control devices and after construction, re-seed the areas.Avoid wetlands and water bodies and sensitive areas when possible; plan transmission routes to minimize impacts to wetlands and water bodies that must be crossed; use equipment specifically designed for work around wetlands and streams, install erosion controls, and implement best management practices to minimize impacts to aquatic systems. Before transmission line construction, conduct ecological surveys and determine site-specific erosion control measures. If there is potential for construction of a new transmission line to degrade habitat of a listed aquatic

spoils area afteconstruction. Dimplement a coSWPPP; condumonitoring as rethe storm waterpermit. Stabilizareas and adjacshoreline constwith erosion coand after constrseed the areas.Avoid wetlandsbodies and senwhen possible; transmission rominimize impacwetlands and wthat must be croequipment specdesigned for wowetlands and sinstall erosion cimplement bestmanagement pminimize impacsystems. Befortransmission linconstruction, coecological survedetermine site-serosion control If there is potenconstruction of transmission lin





(Greenfield)



10.4-22B

enefit-Cost B

alance

STP 3 & 4

Environmental R

eport

Aq(c

d aquatic losely with y to develop chedule and hniques that f the habitat question.verse

Impacts – oidable s at the n; small

verse er plant site.

construction schedule and construction techniques that are protective of the habitat and species in question.Unavoidable Adverse Environmental Impacts – Moderate unavoidable adverse impacts at the reservoir location; small unavoidable adverse impacts at power plant site.

Te t – Habitat tial impacts r imals at the inity. tivities permanent 00 acres of g the voir. f animals uction site, ile ls, and the ation of nd high

Adverse Impact – Habitat loss, and potential impacts to threatened or endangered plants or animals at the site or in the vicinity. Construction activities would result in permanent loss of up to 3,500 acres of habitat, including the proposed reservoir. Displacement of animals from the construction site, loss of less mobile individual animals, and the potential degradation of forested




(Greenfield)

Rev. 03

uatic Ecology ontinued)

a construction schedule and construction techniques that are protective of the habitat and species in question.Unavoidable Adverse Environmental Impacts – Moderate unavoidable adverse impacts.

transmission line to degrade habitat of a listed aquatic species, work closely with the state agency to develop a construction schedule and construction techniques that are protective of the habitat and species in question.Unavoidable Adverse Environmental Impacts – Large unavoidable adverse impacts (considering cumulative impacts of larger reservoir compared to other sites; and potentially more waterbody crossings due to longer transmission line length).

species, work closely with the state agency to develop a construction schedule and construction techniques that are protective of the habitat and species in question.Unavoidable Adverse Environmental Impacts – Moderate unavoidable adverse impacts.

habitat of a listespecies, work cthe state agenca construction sconstruction tecare protective oand species in Unavoidable AdEnvironmental Moderate unavadverse impactreservoir locatiounavoidable adimpacts at pow

rrestrial Ecology Adverse Impact – Habitat loss, and potential impacts to threatened or endangered animals at the site or in the vicinity. Construction activities would result in a permanent loss of 2,000 acres of habitat, including the proposed reservoir. Displacement of animals from the construction site, loss of less mobile individual animals, and the potential degradation of wetlands could also occur.

Adverse Impact – Habitat loss, and potential impacts to threatened or endangered animals at the site or in the vicinity. Construction activities would result in a permanent loss of up to 9,800 cumulative acres of habitat, including the proposed reservoir(s) (to support the plant and provide public water supply). Displacement of animals from the construction site, loss of less mobile

Adverse Impact – Habitat loss, and potential impacts to threatened or endangered plants or animals at the site or in the vicinity. Construction activities would result in a permanent loss of 2,000 acres of habitat, including the proposed reservoir. There would also be a potential loss of over 300 acres of high quality habitat at reservoir site. Moderate to large (permanent) impacts to habitat and

Adverse Impacloss, and potento threatened oendangered ansite or in the vicConstruction acwould result in aloss of up to 2,6habitat, includinproposed reserDisplacement ofrom the constrloss of less mobindividual animapotential degradforested lands a





(Greenfield)



Benefit-C

ost Balance

10.4-23

STP 3 & 4

Environmental R

eport

Te(c

could also

ures – Land be rding to e permits, ents, good ctices, and t ractices. ment ocedures to ion and fugitive

g. Delineate etermine tigation prior nstruction h quality

ied). ction to s.verse

Impacts – y impact to life at t site during phase of ge pacts to life at ven potential uality

r

lands and high quality wetlands could also occur.Mitigation Measures – Land clearing would be conducted according to federal and state regulations and permits, zoning requirements, good construction practices, and established best management practices. Schedule equipment maintenance procedures to minimize emission and spills. Minimize fugitive dust by watering. Delineate wetlands and determine impacts and mitigation prior to beginning construction activities (no high quality wetlands identified). Restrict construction to designated areas.Unavoidable Adverse Environmental Impacts – Small temporary impact to habitat and wildlife at immediate plant site during the construction phase of the project. Moderate to large (permanent) impacts to habitat and wildlife at reservoir site. Potential for more forested areas to be disturbed than at Malakoff,




(Greenfield)

Rev. 03

rrestrial Ecology ontinued)

Mitigation Measures – Land clearing would be conducted according to federal and state regulations and permits, zoning requirements, good construction practices, and established best management practices. Schedule equipment maintenance procedures to minimize emission and spills. Minimize fugitive dust by watering. Delineate wetlands and determine impacts and mitigation prior to beginning construction activities (no high quality wetlands identified). Restrict construction to designated areas.Unavoidable Adverse Environmental Impacts – Small temporary impact to habitat and wildlife at immediate plant site during the construction phase of the project. Moderate (permanent) impacts to habitat and wildlife at reservoir site.

individual animals, and the potential degradation of wetlands could also occur.Mitigation Measures – Land clearing would be conducted according to federal and state regulations and permits, zoning requirements, good construction practices, and established best management practices. Schedule equipment maintenance procedures to minimize emission and spills. Minimize fugitive dust by watering. Delineate wetlands and determine impacts and mitigation prior to beginning construction activities (no high quality wetlands identified). Restrict construction to designated areas.Unavoidable Adverse Environmental Impacts – Small temporary impact to habitat and wildlife at immediate plant site during the construction phase of the project. Large (permanent) impacts to habitat and wildlife at reservoir site. Moderate to large impacts along

wildlife at reservoir site given potential for impacting high quality habitat during the construction phase of the project. Displacement of animals from the construction site, loss of less mobile individual animals, and the potential degradation of wetlands could also occur.Mitigation Measures – Land clearing would be conducted according to federal and state regulations and permits, zoning requirements, good construction practices, and established best management practices. Schedule equipment maintenance procedures to minimize emission and spills. Minimize fugitive dust by watering. Delineate wetlands and determine impacts and mitigation prior to beginning construction activities (no high quality wetlands identified). Restrict construction to designated areas.Unavoidable Adverse Environmental Impacts – Small temporary impact to

quality wetlandsoccur.Mitigation Measclearing would conducted accofederal and statregulations andzoning requiremconstruction praestablished besmanagement pSchedule equipmaintenance prminimize emissspills. Minimizedust by waterinwetlands and dimpacts and mito beginning coactivities (no higwetlands identifRestrict construdesignated areaUnavoidable AdEnvironmental Small temporarhabitat and wildimmediate planthe constructionthe project. Lar(permanent) imhabitat and wildreservoir site gito impact high qhabitat in Ceda





(Greenfield)



10.4-24B

enefit-Cost B

alance

STP 3 & 4

Environmental R

eport

Te(c

reek area, r protected esent; small f facility rge impact on lines nificant 70 acres viously ts-of-way.

but much of site area has been previously disturbed (industrial area that includes lignite mine) with good existing infrastructure (i.e., minimal to no acreage required for rail, transmission and access road).

So t – lated x of 9,616

ould mand for school increase the services.ure – employment gradually. emand for nd more e/teachers by rty and venues e ject, which

ties could , facilities, services.

Adverse Impact – Construction-related population influx of 9,616 into the region would increase the demand for housing, add to school enrollment and increase the need for public services.Mitigation Measure – Project-related employment would increase gradually. An increased demand for local services and more classroom space/teachers would be offset by increased property and sales/use tax revenues generated by the construction project, which counties and cities could use to add staff, facilities, equipment, and services.




(Greenfield)

Rev. 03

rrestrial Ecology ontinued)

transmission depending on percentage of right-of-way that is undisturbed.

habitat and wildlife at immediate plant site during the construction phase of the project. Moderate to large (permanent) impacts to habitat and wildlife at reservoir site. Small impacts are expected at the plant site; and moderate to large impacts at the reservoir site, because of high quality habitat.

Creek/Walnut Cand potential fospecies to be primpact in area ofootprint; and lafrom transmissiassuming a sigportion of the 9would be in preundisturbed righ

cioeconomic Adverse Impact – Construction-related population influx of 9,616 into the region would increase the demand for housing, add to school enrollment and increase the need for public services.Mitigation Measure – Project-related employment would increase gradually. An increased demand for local services and more classroom space/teachers would be offset by increased property and sales/use tax revenues generated by the construction project, which counties and cities could use to add staff, facilities, equipment, and services.



Adverse ImpacConstruction-repopulation influinto the region wincrease the dehousing, add toenrollment and need for public Mitigation MeasProject-related would increaseAn increased dlocal services aclassroom spacwould be offsetincreased propesales/use tax regenerated by thconstruction procounties and ciuse to add staffequipment, and





(Greenfield)



Benefit-C

ost Balance

10.4-25

STP 3 & 4

Environmental R

eport

So(c

ction plans influx of mmunity rs and ld meet the itional se the

ng lead time, the cipates the ulation, able

oom space, ices would

verse Impacts – cts to host ty of in-ation resides pacts on , given

llas ea; Ellis southern

as and can population

– Increased oads.ure –

uction affic plan t of dd turn

Discuss construction plans and anticipated influx of workers with community leaders. Builders and developers would meet the demand for additional housing. Because the project has a long lead time, it is likely that if the community anticipates the increase in population, adequate affordable housing, classroom space, and public services would be available.Unavoidable Adverse Environmental Impacts – Large impacts to host county if majority of in-migrating population resides there. Large impacts to two-county area, since area is very rural; small impacts to the region. Note that impacts could be alleviated to a certain extent if the construction workforce supporting the planned Unit 3 expansion at the Limestone coal plant (estimated at 1,000 workers who would already be living in the area) would be available to support construction of the new




(Greenfield)

Rev. 03

cioeconomic ontinued)

Discuss construction plans and anticipated influx of workers with community leaders. Builders and developers would meet the demand for additional housing. Because the project has a long lead time, it is likely that if the community anticipates the increase in population, adequate affordable housing, classroom space, and public services would be available.Unavoidable Adverse Environmental Impacts – Large impacts to host county if majority of in-migrating population resides there. Small to moderate impacts on two-county area, given proximity to Sherman-Denison metropolitan area in adjacent Grayson County. Small impacts to region.

Adverse Impact – Increased traffic on local roads.Mitigation Measure – Develop construction management traffic plan prior to the start of construction. Add turn lanes at construction entrance and possible

Discuss construction plans and anticipated influx of workers with community leaders. Builders and developers would meet the demand for additional housing. Because the project has a long lead time, it is likely that if the community anticipates the increase in population, adequate affordable housing, classroom space, and public services would be available.Unavoidable Adverse Environmental Impacts – Large impacts to host county if majority of in-migrating population resides there. Small impacts to two-county area and region given site’s proximity to large metropolitan area of Houston and the ability of Houston to easily absorb a population influx.

Adverse Impact – Increased traffic on local roads.Mitigation Measure – Develop construction management traffic plan prior to the start of construction. Add turn lanes at construction

Discuss construction plans and anticipated influx of workers with community leaders. Builders and developers would meet the demand for additional housing. Because the project has a long lead time, it is likely that if the community anticipates the increase in population, adequate affordable housing, classroom space, and public services would be available.Unavoidable Adverse Environmental Impacts – Large impacts to host county if majority of in-migrating population resides there. Small to moderate impacts on two-county area. Small impacts to region.

Adverse Impact – Increased traffic on local roads, especially combined with workers commuting to nearby Big Brown coal plant and lignite mining operation.Mitigation Measure – Develop construction management traffic plan prior to the start of construction. Add turn lanes at construction

Discuss construand anticipatedworkers with coleaders. Buildedevelopers woudemand for addhousing. Becauproject has a loit is likely that ifcommunity antiincrease in popadequate affordhousing, classrand public servbe available.Unavoidable AdEnvironmental Moderate impacounty if majorimigrating populthere. Small imtwo-county areaproximity to Dametropolitan arCounty includessuburbs of Dallreadily absorb ainflux.

Adverse Impacttraffic on local rMitigation MeasDevelop constrmanagement trprior to the starconstruction. A





(Greenfield)



10.4-26B

enefit-Cost B

alance

STP 3 & 4

Environmental R

eport

So(c

ction ossible e. Install hting and

age. Post truction xists to aware of construction ncourage r shuttle ers to and tagger shifts nal periods.verse

Impacts – ge adverse construction d traffic on h also

ort area ary site

e SH-31 rt of the ritage Trails o provides r Creek and bers

nuclear facility; this would depend on final scheduling for the two construction projects.

Adverse Impact – Increased traffic on local roads, especially combined with workers commuting to nearby Limestone plant (including new Unit 3 which is assumed to be constructed well before peak construction for nuclear plant).Mitigation Measure – Develop construction management traffic plan prior to the start of construction. Add turn lanes at construction entrance and possible second entrance. Install traffic-control lighting and directional signage. Post signs near construction entrances and exists to make the public aware of potentially high construction traffic areas. Encourage carpooling, offer shuttle service to workers to and from site, and stagger shifts to avoid traditional congestion time periods.




(Greenfield)

Rev. 03


second entrance. Install traffic-control lighting and directional signage. Post signs near construction entrances and exists to make the public aware of potentially high construction traffic areas. Encourage carpooling, offer shuttle service to workers to and from site, and stagger shifts to avoid traditional congestion time periods.Unavoidable Adverse Environmental Impacts – Small to moderate adverse impacts during construction due to increased traffic on local roads.

entrance and possible second entrance. Install traffic-control lighting and directional signage. Post signs near construction entrances and exists to make the public aware of potentially high construction traffic areas. Encourage carpooling, offer shuttle service to workers to and from site, and stagger shifts to avoid traditional congestion time periods.Unavoidable Adverse Environmental Impacts – Small to moderate adverse impacts during construction due to increased traffic on local roads.

entrance and possible second entrance. Install traffic-control lighting and directional signage. Post signs near construction entrances and exists to make the public aware of potentially high construction traffic areas. Encourage carpooling, offer shuttle service to workers to and from site, and stagger shifts to avoid traditional congestion time periods.Unavoidable Adverse Environmental Impacts – Small to moderate adverse impacts during construction due to increased traffic on local roads.

lanes at construentrance and psecond entranctraffic-control ligdirectional signsigns near consentrances and emake the publicpotentially high traffic areas. Ecarpooling, offeservice to workfrom site, and sto avoid traditiocongestion timeUnavoidable AdEnvironmental Moderate to larimpacts during due to increaselocal roads whicappear to supprecreation. Primaccess would bwhich is also paTexas Lakes HeSystem, and alsaccess to CedaRichland ChamReservoirs.





(Greenfield)



Benefit-C

ost Balance

10.4-27

STP 3 & 4

Environmental R

eport

So(c

Unavoidable Adverse Environmental Impacts – Large unavoidable adverse impacts during construction due to increased traffic on local roads.

EnJu m construction of the proposed new units

PhNo ion.

l exposure to noise, dust and exhaust gularly inspect and maintain equipment to sion requirements. Phase construction to aylight hours. Develop and implement a tion roads, phasing grading activities and

exhaust emissions during construction.

bcontractors to develop and implement onitoring. of the project.

Ra




(Greenfield)

Rev. 03


vironmental stice

The following description applies to all alternate/additional sites.Adverse Impact – No disproportionately high or adverse impact on minority or low-income populations frohave been identified.Mitigation Measure – None required.Unavoidable Adverse Environmental Impacts – Small unavoidable adverse impacts.

ysical andn-Radiological

The following description applies to all alternate/additional sites.Adverse Impact – Temporary and localized noise, fugitive dust, and exhaust emissions during constructMitigation Measure – Train and appropriately protect construction workers to reduce the risk of potentiaemissions. Make public announcements or prior notification of atypically loud construction activities. Reinclude exhaust and noise aspects. Operate equipment in accordance with federal, state and local emisminimize daily emissions. Restrict noise-related activities to daylight hours. Restrict delivery times to ddust control plan that includes mitigation measures such as watering unpaved roads, stabilizing construcceasing them during high winds, etc.Unavoidable Adverse Environmental Impacts – Small temporary and localized noise, fugitive dust, and

Adverse Impact – Construction workers could experience occupational illnesses, injuries, or death.Mitigation Measure – Train contractors on safety requirements. Require construction contractors and susafety procedures. Provide onsite services for emergency first aid; conduct regular health and safety mUnavoidable Adverse Environmental Impacts – Small, temporary impacts during the construction phase

diological The following description applies to all alternate/additional sites.Adverse Impact – None.Mitigation Measure – No mitigation required.Unavoidable Adverse Environmental Impacts – No unavoidable adverse impacts.





(Greenfield)



10.4-28B

enefit-Cost B

alance

STP 3 & 4

Environmental R

eport

AtM ion.

missions. Develop and implement a dust roads, phasing grading activities, and s and debris stockpiles, reducing material equipment, etc.ust, and exhaust emissions during

La t – Land nt facility reservoir nently plant until g. aintenance

line and restrict land ransmission ut eration tially cultivation, ting but

ntial and

ure – No be required nd use post

verse Impact – land will not til

Adverse Impact – Land occupied by plant facility and associated reservoir would be permanently dedicated to the plant until decommissioning. Operation and maintenance of transmission line and corridors would restrict land use within the transmission rights-of-way, but transmission operation would be potentially compatible with cultivation, grazing and hunting but preclude residential and industrial use.Mitigation Measure – No mitigation would be required for continued land use post construction.Unavoidable Adverse Environmental Impact – Small impacts: land will not be available until




(Greenfield)

Rev. 03

mospheric and eteorological

The following description applies to all alternate/additional sites.Adverse Impact – Temporary and localized noise, fugitive dust, and exhaust emissions during constructMitigation Measures – Regularly inspect and maintain equipment. Phase construction to minimize daily econtrol plan that includes mitigation measures such as watering unpaved roads, stabilizing constructionsuspending grading/earthmoving during high winds and extreme air pollution events, covering truck loadhandling, limiting vehicle speed, re-vegetating medians and slopes, visually inspecting emission controlUnavoidable Adverse Environmental Impacts – Small, temporary impacts from localized noise, fugitive dconstruction.

Operations-Relatednd Use Adverse Impact – Land

occupied by plant facility and associated reservoir would be permanently dedicated to the plant until decommissioning. Operation and maintenance of transmission line and corridors would restrict land use within the transmission rights-of-way, but transmission operation would be potentially compatible with cultivation, grazing and hunting but preclude residential and industrial use.Mitigation Measure – No mitigation would be required for continued land use post construction.Unavoidable Adverse Environmental Impact – Small impacts: land will not be

Adverse Impact – Land occupied by plant facility and associated reservoir(s) would be permanently dedicated until decommissioning. Operation and maintenance of transmission line and corridors would restrict land use within the transmission rights-of-way, but transmission operation would be potentially compatible with cultivation, grazing and hunting but preclude residential and industrial use.Mitigation Measure – No mitigation would be required for continued land use post construction.Unavoidable Adverse Environmental Impact – Small impacts: land will not be available until

Adverse Impact – Land occupied by plant facility and associated reservoir would be permanently dedicated to the plant until decommissioning. Operation and maintenance of transmission line and corridors would restrict land use within the transmission rights-of-way, but transmission operation would be potentially compatible with cultivation, grazing and hunting but preclude residential and industrial use.Mitigation Measure – No mitigation would be required for continued land use post construction.Unavoidable Adverse Environmental Impact – Small impacts: land will not be available until

Adverse Impacoccupied by plaand associatedwould be permadedicated to thedecommissioninOperation and mof transmissioncorridors woulduse within the trights-of-way, btransmission opwould be potencompatible withgrazing and hunpreclude resideindustrial use.Mitigation Measmitigation wouldfor continued laconstruction.Unavoidable AdEnvironmental Small impacts: be available un





(Greenfield)



Benefit-C

ost Balance

10.4-29

STP 3 & 4

Environmental R

eport

La(c

g of the decommissioning of the plant.

LaM are required to be disposed in permitted

federal requirements.te disposal facility(ies) with a land use

iate regulations and guidelines until such ea could be restored for other uses.ated to permitted landfills or licensed

HyW er would be withdrawn from the cooling

ns. Design and operate intake structures

Water would be added back to the river

dards. Prepare and implement a SWPPP nt/minimize contamination from spills.

ld be maintained within limits set in the




(Greenfield)

Rev. 03

nd Use ontinued)

available until decommissioning of the plant.

decommissioning of the plant.

decommissioning of the plant.

decommissioninplant.

nd Use (Waste anagement)

The following description applies to all alternate/additional sites.Adverse Impact – Operating the new units would generate radioactive and non-radioactive wastes that disposal facilities or permitted landfills. Generation of spent fuel will require disposal in accordance withMitigation Measure – Implement waste minimization program. Disposal area(s) would be permitted wasdesignated for such activities. Temporary spent fuel storage facilities would be operated under approprtime a NRC licensed high-level waste disposal facility is constructed. At that time, the storage facility arUnavoidable Adverse Environmental Impacts – Small unavoidable impacts. Some land would be dedicdisposal facilities and would not be available for other uses.

drology and ater Use

The following description applies to all alternate/additional sites.Adverse Impact – The site is assumed to require construction of a cooling water reservoir. Makeup watwater source to replace water lost to evaporation, drift, seepage, and blowdown.Mitigation Measure – Comply with surface water rights and water withdrawal requirements and restrictiobased on best available technology. Monitor hydrological impacts as required by water permit(s).Unavoidable Adverse Environmental Impacts – Small unavoidable adverse impacts.

Adverse Impact – Operations would result in discharge of small amounts of chemicals to Texas waters. through the blowdown discharge.Mitigation Measure – All discharges would comply with TPDES permit and applicable water quality stanto avoid/minimize releases of contaminated storm water. Prepare and implement a SPCC plan to preveUnavoidable Adverse Environmental Impacts – Small unavoidable adverse impacts.

Adverse Impact – Operations may result in a small thermal plume discharged to Texas waters.Mitigation Measure – The differences between plume temperature and ambient water temperature wouTPDES permit.Unavoidable Adverse Environmental Impacts – Small unavoidable adverse impacts.





(Greenfield)



10.4-30B

enefit-Cost B

alance

STP 3 & 4

Environmental R

eport

Aq

the “Best Technology Available”. g discharges to surface water. Use of

ct aquatic populations or water quality.

activities near water.

Te

rom routine maintenance of woody

ect flora and fauna. Train personnel in the pill response equipment on hand during

plant.So t –

ted direct rkers (and ould d for

oom space,

Adverse Impact – Operations-related direct and indirect workers (and their families) would increase demand for housing, classroom space,




(Greenfield)

Rev. 03

uatic Ecology The following description applies to all alternate/additional sites.Adverse Impact – Impacts to aquatic biota from impingement, entrainment and thermal discharges.Mitigation Measure – Intake structure designed to minimize impingement and entrainment mortality withDischarges would comply with USEPA and Texas regulations (e.g., TPDES permit conditions) addressincooling towers that minimize withdrawal of river water for plant operation.Unavoidable Adverse Environmental Impacts – Small unavoidable adverse impacts.

Adverse Impact – Operations would result in discharge of small amounts of chemicals to Texas waters.Mitigation Measure – The TPDES permit limits are set to ensure that discharges do not significantly affeUnavoidable Adverse Environmental Impacts – Small unavoidable adverse impacts on aquatic ecology.

Adverse Impact – Potential impacts to aquatic ecology due to petroleum spills from routine maintenanceMitigation Measure – Prepare and implement a SPCC Plan to avoid/minimize contamination from spills.Unavoidable Adverse Environmental Impacts – Small unavoidable adverse impacts.

rrestrial Ecology The following description applies to all alternate/additional sites.Adverse Impact – No adverse impacts from cooling towers are anticipated.Mitigation Measures – None required.Unavoidable Adverse Environmental Impacts – No unavoidable adverse impacts.

Adverse Impact – Episodic loud noises at the site or along lines could frighten animals.Mitigation Measure – Animal displacement due to noise would be temporary in nature.Unavoidable Adverse Environmental Impacts – Small temporary unavoidable adverse impacts.

Adverse Impact – Potential impacts to vegetation and habitat within the transmission line rights-of-way fvegetative growth by manual and mechanical methods and herbicides.Mitigation Measure – Implement existing procedures for transmission line maintenance designed to prothandling of fuel and lubricants and the clean-up and reporting of any incidental spills. Have adequate smaintenance activities in the corridors.Unavoidable Adverse Environmental Impacts – Small unavoidable adverse impacts during the life of the

cioeconomic Adverse Impact – Operations-related direct and indirect workers (and their families) would increase demand for housing, classroom space,



Adverse ImpacOperations-relaand indirect wotheir families) wincrease demanhousing, classr





(Greenfield)



Benefit-C

ost Balance

10.4-31

STP 3 & 4

Environmental R

eport

So(c

ices within Ellis e ROI over conditions,

han the ated

ure – ated influx of hedule with ers, nd regional ortunity to x. Builders

would meet additional sed tax esult of the nd l resources, ed to

onal ent and hire

public ecessary. oject has a it is likely unity

increase in quate ing, e, and would be

and public services within Henderson and Ellis Counties and the ROI over pre-construction conditions, but much less than the construction-related population.Mitigation Measure – Discuss anticipated influx of workers and schedule with community leaders, allowing local and regional officials the opportunity to plan for the influx. Builders and developers would meet the demand for additional housing. Increased tax revenues as a result of the project would fund additional school resources, and could be used to purchase additional facilities/equipment and hire train additional public service staff if necessary. Because the project has a long lead time, it is likely that if the community anticipates the increase in population, adequate affordable housing, classroom space, and public services would be available.




(Greenfield)

Rev. 03


and public services within Fannin and Grayson Counties and the ROI over pre-construction conditions, but much less than the construction-related population.Mitigation Measure – Discuss anticipated influx of workers and schedule with community leaders, allowing local and regional officials the opportunity to plan for the influx. Builders and developers would meet the demand for additional housing. Increased tax revenues as a result of the project would fund additional school resources, and could be used to purchase additional facilities/equipment and hire train additional public service staff if necessary. Because the project has a long lead time, it is likely that if the community anticipates the increase in population, adequate affordable housing, classroom space, and public services would be available.

and public services within Austin and Fort Bend Counties and the ROI over pre-construction conditions, but much less than the construction-related population.Mitigation Measure – Discuss anticipated influx of workers and schedule with community leaders, allowing local and regional officials the opportunity to plan for the influx. Builders and developers would meet the demand for additional housing. Increased tax revenues as a result of the project would fund additional school resources, and could be used to purchase additional facilities/equipment and hire train additional public service staff if necessary. Because the project has a long lead time, it is likely that if the community anticipates the increase in population, adequate affordable housing, classroom space, and public services would be available.

and public services within Freestone and Henderson Counties and the ROI over pre-construction conditions, but much less than the construction-related population.Mitigation Measure – Discuss anticipated influx of workers and schedule with community leaders, allowing local and regional officials the opportunity to plan for the influx. Builders and developers would meet the demand for additional housing. Increased tax revenues as a result of the project would fund additional school resources, and could be used to purchase additional facilities/equipment and hire train additional public service staff if necessary. Because the project has a long lead time, it is likely that if the community anticipates the increase in population, adequate affordable housing, classroom space, and public services would be available.

and public servHenderson andCounties and thpre-constructionbut much less tconstruction-relpopulation.Mitigation MeasDiscuss anticipworkers and sccommunity leadallowing local aofficials the oppplan for the influand developersthe demand forhousing. Increarevenues as a rproject would fuadditional schooand could be uspurchase additifacilities/equipmtrain additional service staff if nBecause the prlong lead time, that if the commanticipates the population, adeaffordable housclassroom spacpublic services available.





(Greenfield)



10.4-32B

enefit-Cost B

alance

STP 3 & 4

Environmental R

eport

So(c

verse Impacts – ble adverse ite proximity bs, which is dily absorb x.

– Operation ld increase al roads ge; Trinidad earby

rkforce is significantly pe of plant. site would even further.ure –

ering outage plant-ic on local ift changes; travel tives at STP

verse Impacts – ate verse

– Additional may impact

Unavoidable Adverse Environmental Impacts – Small to moderate unavoidable adverse impacts, given site’s rural location.

Adverse Impact – Operation of two units would increase the traffic on local roads during shift change, especially given site’s close proximity to the existing Limestone coal plant and lignite mining operations. Outages at the site would increase traffic even further.Mitigation Measure – Consider staggering outage shifts to reduce plant-associated traffic on local roads during shift changes; vanpooling and travel reduction incentives (currently in use at STP Units 1 & 2).Unavoidable Adverse Environmental Impacts – Small to moderate unavoidable adverse impacts.

Adverse Impact – Additional cooling towers may impact existing viewscape.




(Greenfield)

Rev. 03


Unavoidable Adverse Environmental Impacts – Small to moderate unavoidable adverse impacts.

Adverse Impact – Operation of two units would increase the traffic on local roads during shift change. Valley power plant is located adjacent to the site, although its workforce is expected to be significantly smaller given type of plant. Outages at the site would increase traffic even further.Mitigation Measure – Consider staggering outage shifts to reduce plant-associated traffic on local roads during shift changes; vanpooling and travel reduction incentives (currently in use at STP Units 1 & 2).Unavoidable Adverse Environmental Impacts – Small unavoidable adverse impacts.

Adverse Impact – Additional cooling towers may impact existing viewscape.Mitigation Measure – During

Unavoidable Adverse Environmental Impacts – Small unavoidable adverse impacts given proximity to metropolitan area of Houston, which is expected to readily absorb population influx.

Adverse Impact – Operation of two units would increase the traffic on local roads during shift change. Outages at the site would increase traffic even further.Mitigation Measure – Consider staggering outage shifts to reduce plant-associated traffic on local roads during shift changes; vanpooling and travel reduction incentives (currently in use at STP Units 1 & 2).Unavoidable Adverse Environmental Impacts – Small unavoidable adverse impacts.

Adverse Impact – Additional cooling towers may impact existing viewscape.Mitigation Measure – During plant layout, attempt to locate towers in an area


Adverse Impact – Operation of two units would increase the traffic on local roads during shift change, especially if they coincided with operating shifts of workers at nearby Big Brown plant and lignite mining operations. Outages at the site would increase traffic even further.Mitigation Measure – Encourage carpooling/vanpooling, offer shuttle service to workers to and from site, and travel reduction incentives (currently in use at STP Units 1 & 2). Consider staggering outage shifts to reduce plant-associated traffic on local roads during shift changes.Unavoidable Adverse Environmental Impacts – Small unavoidable adverse impacts.

Adverse Impact – Additional

Unavoidable AdEnvironmental Small unavoidaimpacts given sto Dallas suburexpected to reapopulation influ

Adverse Impactof two units wouthe traffic on locduring shift chanpower plant is nalthough its woexpected to be smaller given tyOutages at the increase traffic Mitigation MeasConsider staggshifts to reduceassociated traffroads during shvanpooling andreduction incen(currently in useUnits 1 & 2).Unavoidable AdEnvironmental Small to moderunavoidable adimpacts.

Adverse Impactcooling towers





(Greenfield)



Benefit-C

ost Balance

10.4-33

STP 3 & 4

Environmental R

eport

So(c

ape, heavy in the

ure – During empt to an area ea view um extent

verse Impacts – ate verse

t – f fossil fuels cycle be small ower

ure – No ed.verse

Impacts – ble adverse

t – Site is in ric and l vidence of ing and peration

Mitigation Measure – During plant layout, attempt to locate towers in an area isolated from area view points to maximum extent possible.Unavoidable Adverse Environmental Impacts – Site is located in an industrialized area. Small unavoidable adverse impacts.

Adverse Impact – Consumption of fossil fuels during the fuel-cycle process would be small relative to the power production.Mitigation Measure – No mitigation needed.Unavoidable Adverse Environmental Impacts – Small unavoidable adverse impacts.

Adverse Impact – Site is in an area of historic and potential mineral development (evidence of oil and gas drilling and lignite mining operation nearby). Purchase of mineral rights to develop site for nuclear would result




(Greenfield)

Rev. 03


plant layout, attempt to locate towers in an area isolated from area view points to maximum extent possible.Unavoidable Adverse Environmental Impacts – Small to moderate unavoidable adverse impacts.


isolated from area view points to maximum extent possible.Unavoidable Adverse Environmental Impacts – Small to moderate unavoidable adverse impacts.


cooling towers may impact existing viewscape.Mitigation Measure – During plant layout, attempt to locate towers in an area isolated from area view points to maximum extent possible.Unavoidable Adverse Environmental Impacts – Small to moderate unavoidable adverse impacts.Adverse Impact – Consumption of fossil fuels during the fuel-cycle process would be small relative to the power production.Mitigation Measure – No mitigation needed.Unavoidable Adverse Environmental Impacts – Small unavoidable adverse impacts.

Adverse Impact – Site is in an area of historic and potential mineral development (evidence of oil and gas drilling and lignite mining operation nearby). Purchase of mineral rights to develop site for nuclear would result

existing viewscespecially givenrecreational usegeneral area.Mitigation Measplant layout, attlocate towers inisolated from arpoints to maximpossible.Unavoidable AdEnvironmental Small to moderunavoidable adimpacts.

Adverse ImpacConsumption oduring the fuel-process would relative to the pproduction.Mitigation Measmitigation needUnavoidable AdEnvironmental Small unavoidaimpacts.

Adverse Impacan area of histopotential mineradevelopment (eoil and gas drilllignite mining o





(Greenfield)



10.4-34B

enefit-Cost B

alance

STP 3 & 4

Environmental R

eport

So(c

ase of develop would result t or loss of ells (or ing of ine at otential loss xploration

ure – ime for rights w them to mineral could rk at new

verse Impacts – ble impact, f access to ble

oil, gas).

in displacement or loss of active oil/gas wells; or prevent potential plans to expand existing lignite mining operations (if needed for Limestone plant); and potential loss of oil and gas exploration jobs.Mitigation Measure – Sufficient lead time for current mineral rights owners will allow them to plan for loss of mineral rights; workers could presumably find construction work at new nuclear plant.Unavoidable Adverse Environmental Impacts – Small unavoidable impact, including loss of access to potentially valuable minerals (coal, oil, gas).

EnJu resulting from operation of the proposed




(Greenfield)

Rev. 03


in displacement or loss of active oil/gas wells; lost potential to expand lignite mining operations (if needed for nearby Big Brown coal plant); and potential loss of oil and gas exploration jobs.Mitigation Measure – Sufficient lead time for current mineral rights owners will allow them to plan for loss of mineral rights; workers could presumably find construction work at new nuclear plant.Unavoidable Adverse Environmental Impacts – Small unavoidable impact, including loss of access to potentially valuable minerals (coal, oil, gas).

nearby). Purchmineral rights tosite for nuclear in displacemenactive oil/gas wpossible reopenhistoric lignite mMalakoff); and pof oil and gas ejobs.Mitigation MeasSufficient lead tcurrent mineralowners will alloplan for loss of rights; workers presumably findconstruction wonuclear plant.Unavoidable AdEnvironmental Small unavoidaincluding loss opotentially valuaminerals (coal,

vironmental stice

The following description applies to all alternate/additional sites.Adverse Impact – No disproportionately high or adverse impacts on minority or low-income populations new units have been identified.Mitigation Measure – No mitigation needed. Unavoidable Adverse Environmental Impact – No unavoidable adverse impacts.





(Greenfield)



Benefit-C

ost Balance

10.4-35

STP 3 & 4

Environmental R

eport

PhNo

t – Potential l injuries and

ure – strial safety

verse Impacts – ble adverse

t – The noise.ure – Noise

rmally not be nd at the o mitigation


t – Episodic ld annoy s.ure – s on a case-

verse Impacts – y verse

Adverse Impact – Potential for occupational injuries and illnesses.Mitigation Measure – Implement industrial safety program.Unavoidable Adverse Environmental Impacts – Small unavoidable adverse impacts.

Adverse Impact – The plants emit low noise.Mitigation Measure – Noise levels would normally not be above background at the site boundary. No mitigation is necessary.Unavoidable Adverse Environmental Impacts – Small unavoidable adverse impacts.

Adverse Impact – Episodic loud noises could annoy nearby residents.Mitigation Measure – Handle incidents on a case-by-case basis.Unavoidable Adverse Environmental Impacts – Small temporary unavoidable adverse impacts.




(Greenfield)

Rev. 03








Adverse Impact – Potential for occupational injuries and illnesses.Mitigation Measure – Implement industrial safety program.Unavoidable Adverse Environmental Impacts – Small to moderate unavoidable adverse impacts, depending on mineral reserves found beneath the site.


Adverse Impact – Episodic loud noises could annoy nearby residents.Mitigation Measure – Handle incidents on a case-by-case basis.Unavoidable Adverse Environmental Impacts – Small temporary

Adverse Impacfor occupationaillnesses.Mitigation MeasImplement induprogram.Unavoidable AdEnvironmental Small unavoidaimpacts.

Adverse Impacplants emit low Mitigation Measlevels would noabove backgrousite boundary. Nis necessary.Unavoidable AdEnvironmental Small unavoidaimpacts.

Adverse Impacloud noises counearby residentMitigation MeasHandle incidentby-case basis.Unavoidable AdEnvironmental Small temporarunavoidable adimpacts.





(Greenfield)



10.4-36B

enefit-Cost B

alance

STP 3 & 4

Environmental R

eport

PhNo(c

t – New e has ce electric standing

ure – Build e to NESC e noise and


Adverse Impact – New transmission line has potential to induce electric shock in people standing near the line.Mitigation Measure – Build transmission line to NESC code to minimize noise and electric shock.Unavoidable Adverse Environmental Impacts – Small unavoidable adverse impacts.

Rae water. Dose to terrestrial and aquatic e to public and workers due to transport of

eleases would be well below regulatory

further mitigation required.




(Greenfield)

Rev. 03


ontinued)

Adverse Impact – New transmission line has potential to induce electric shock in people standing near the line.Mitigation Measure – Build transmission line to NESC code to minimize noise and electric shock.

Unavoidable Adverse Environmental Impacts – Small unavoidable adverse impacts.


unavoidable adverse impacts.


Adverse Impactransmission linpotential to indushock in peoplenear the line.Mitigation Meastransmission lincode to minimizelectric shock.Unavoidable AdEnvironmental Small unavoidaimpacts.

diological The following description applies to all alternate/additional sites.Adverse Impact – Potential doses to workers and members of the public from releases to air and surfacecosystems from chronic radiation exposure caused by the small discharges of radioactive liquids. Dosnuclear fuel.Mitigation Measure – Monitor radiological releases as required by radiological monitoring program. All rlimits. No further mitigation required.Unavoidable Adverse Environmental Impact – Small unavoidable adverse impacts.

Adverse Impact – Fuel cycle activities would have liquid discharges.Mitigation Measure – Monitor radiological releases as required by radiological monitoring program. No Unavoidable Adverse Environmental Impact – Small unavoidable adverse impacts.





(Greenfield)



Benefit-C

ost Balance

10.4-37

STP 3 & 4

Environmental R

eport

AtM rease in precipitation. Noise attenuates

cessary to result in damage to vegetation.its and regulations for operating air

g equipment.rmitting regulations for installing and




(Greenfield)

Rev. 03

mospheric and eteorological

The following description applies to all alternate/additional sites.Adverse Impact – Operation of cooling towers would result in noise, salt deposition, and a very small incquickly so noise levels would be minimal at the site boundary. Salt deposition of less than the amount neMitigation Measure –None required for cooling towers. Plant operation will comply with state permit limemission sources.Unavoidable Adverse Environmental Impact – Small unavoidable adverse impacts.

Adverse Impact – Emissions from intermittent operation of diesel generators and other emission emittinMitigation Measure – Power facility must meet applicable federal, state (TCEQ), and local air quality peoperating air emission sources.Unavoidable Adverse Environmental Impact – Small unavoidable adverse impacts.

Adverse Impact – Relatively small quantities of air pollutants would result from fuel cycle.Mitigation Measure – No mitigation required.Unavoidable Adverse Environmental Impact – Small unavoidable adverse impacts.





(Greenfield)



10.4-38B

enefit-Cost B

alance

STP 3 & 4

Environmental R

eport

2 Alternative Site #3

llens ld)

Proposed Project at Malakoff Site (Greenfield)

E 0 20,000,000 to 22,000,000 MW-hours per year

G 2700 MW

D uction ty tax unty

During the 7-year construction period, additional property tax will be paid to Henderson County and the state will see an increase in sales tax revenues.

Dunits ounty.

During operation, tax payments for the 2 new units will be made to Henderson County.

Rev. 03

Table 10.4-3 Benefits of the Proposed Project

Benefit Category Project as Proposed Alternative Site #1 Alternative Site #

Description of Project STP 3 & 4

Proposed Project at Limestone Site (Brownfield)

Proposed Project at ACreek Site (Greenfie

Monetary Benefits

lectricity Generated 20,000,000 to 22,000,000 MW-hours per year

20,000,000 to 22,000,000 MW-hours per year

20,000,000 to 22,000,00MW-hours per year

enerating Capacity 2700 MW 2700 MW 2700 MW

State and Local Tax Payments

uring Construction During the 7-year construction period for STP 3 & 4, NRG would not pay franchise tax but would pay additional property taxes and state will see an increase in sales tax revenues. Projected sales tax payments on construction goods at an estimated $23.9 million per unit, with $5.8 million due to Bay City and $18.1 million to the State of Texas.

During the 7-year construction period, additional property tax will be paid to Limestone County and the state will see an increase in sales tax revenues.

During the 7-year constrperiod, additional properwill be paid to Austin Coand the state will see anincrease in sales tax revenues.

uring Operations $4.7 to $5.4 million in franchise taxes in 2015, the first year of operation for STP 3, and an estimated $8.6 to $10.0 million in 2016, when STP 4 comes on line, and in subsequent years.

During operation, tax payments for the 2 new units will be made to Limestone County.

During operation, tax payments for the 2 new will be made to Austin C

Benefit-C

ost Balance

10.4-39

STP 3 & 4

Environmental R

eport

D sed Similar effects as proposed project at STP.

D sed Similar effects as proposed project at STP.

Fu nd Nuclear option to coal- and gas-fired baseload generation.


llens ld)


Rev. 03

Effects on Regional Productivity

uring Construction 5950 direct jobs (2975 would in-migrate) and 1815 indirect jobs added to local economy. The creation of jobs during construction could inject between $67.6 and $676 million dollars into the regional economy during the life of the construction project.

Similar effects as proposed project at STP.

Similar effects as propoproject at STP.

uring Operations 888 direct jobs and 1305 indirect jobs added to local economy.The operations workforce impact on the regional economy would be estimated at between $45,090,864 to $55,064,880 per year.

Similar effects as proposed project at STP.

Similar effects as propoproject at STP.

Technical and Other Non-Monetary Benefits

el Diversity Nuclear option to coal- and gas-fired baseload generation.

Nuclear option to coal- and gas-fired baseload generation.

Nuclear option to coal- agas-fired baseload generation.






10.4-40B

enefit-Cost B

alance

STP 3 & 4

Environmental R

eport

E tons 80 to

gen per

tons 13 to

Avoidance of 41 to 2900 tons per year sulfur dioxide, 680 to 2000 tons per year nitrogen oxides; 141 to 2800 tons per year carbon monoxide; 6,900,000 to 27,000,000 tons per year carbon dioxide; 13 to 119 tons per year fine particulates.

AR

clear need g.

Maintaining domestic nuclear technology capability as hedge against possible need to control global warming.


llens ld)


Rev. 03

missions Reduction Avoidance of 41 to 2900 tons per year sulfur dioxide, 680 to 2000 tons per year nitrogen oxides; 141 to 2800 tons per year carbon monoxide; 6,900,000 to 27,000,000 tons per year carbon dioxide; 13 to 119 tons per year fine particulates.

Avoidance of 41 to 2900 tons per year sulfur dioxide, 680 to 2000 tons per year nitrogen oxides; 141 to 2800 tons per year carbon monoxide; 6,900,000 to 27,000,000 tons per year carbon dioxide; 13 to 119 tons per year fine particulates.

Avoidance of 41 to 2900per year sulfur dioxide, 62000 tons per year nitrooxides; 141 to 2800 tonsyear carbon monoxide; 6,900,000 to 27,000,000per year carbon dioxide;119 tons per year fine particulates.

dvanced Light Water eactor Development



Maintaining domestic nutechnology capability ashedge against possible to control global warmin






Benefit-C

ost Balance

10.4-41

STP 3 & 4

Environmental R

eport

t Alternative Sites

oject at Malakoff Site (Greenfield)

L - Clearing of approximately 650 and e of the cleared area consists of

s) of land for construction of the new m clearing additional acreage for roads, parking lots, and switchyard. be available for other uses. ure - Conduct construction activities agement Practices (BMP) in regulatory and permit requirements.

ronmental controls required in a lution Protection Plan (SWPPP) such liance inspections, documentation of etc.verse Environmental Impacts –.

(if necessary) would be would be uture agricultural and recreational navoidable adverse impacts during

the plants

Rev. 03

Table 10.4-4 Unavoidable Adverse Environmental Impacts of Proposed Project a

CategoryProposed Project at Limestone

Site (Brownfield)Proposed Project at Allens Creek

Site (Greenfield) Proposed Pr

Construction-Related

and Use Adverse Impact – No new land would be acquired for additional facilities. The proposed project could be configured to fit within the existing, previously disturbed area of the site. . Land would not be available for other uses. Mitigation Measure - Conduct construction activities using Best Management Practices (BMP) in accordance with regulatory and permit requirements. Implement environmental controls required in a Stormwater Pollution Protection Plan (SWPPP) such as weekly compliance inspections, documentation of runoff controls, etc.Unavoidable Adverse Environmental Impacts –Exclusion zone (if necessary) would be excluded from future agricultural and recreational use. Small unavoidable adverse impacts during construction of the plants.

Adverse Impact – Based on STP 3 & 4, approximately 770 acres of land out of the 11,000 acre site would be disturbed during construction, with the potential for erosion. Land would not be available for other uses.Mitigation Measure - Conduct construction activities using Best Management Practices (BMP) in accordance with regulatory and permit requirements. Implement environmental controls required in a Stormwater Pollution Protection Plan (SWPPP) such as weekly compliance inspections, documentation of runoff controls, etc.Unavoidable Adverse Environmental Impacts –. Exclusion zone (if necessary) would be excluded from future agricultural and recreational use. Moderate to large unavoidable adverse impacts during construction of the plants.

Adverse Impact2700 acres (somforested systemfacilities and froconstruction of Land would notMitigation Measusing Best Manaccordance withImplement enviStormwater Polas weekly comprunoff controls, Unavoidable AdExclusion zoneexcluded from fuse. Moderate uconstruction of

10.4-42B

enefit-Cost B

alance

STP 3 & 4

Environmental R

eport

L(c

- New transmission lines could be ing ROW, but it may need to be

ure - Conduct siting study that takes vironmental impacts. Incorporate ns of federal and state agencies into . Site new corridors to avoid critical itats or species as much as possible. ction activities to transmission cess roads. Restrict sites of access

fore site disturbance, conduct nd ecological surveys and determine sion control measures. Comply with ws, regulations, permits, good vironmental management, and ctices.verse Environmental Impacts - Small

avoidable adverse impacts.

native Sites (Continued)


Rev. 03

Construction-Related

and Useontinued)

Adverse Impact – Two new 345-kilovolt transmission lines would be required in a new 200-foot wide corridor. The new lines would be installed mostly within existing Right-of-Ways.Mitigation Measure – If required, conduct siting study that takes into account environmental impacts. Incorporate recommendations of federal and state agencies into route selections. Site new corridors to avoid critical or sensitive habitats or species as much as possible. Restrict construction activities to transmission corridors and access roads. Restrict sites of access to corridors. Before site disturbance, conduct archaeological and ecological surveys and determine site-specific erosion control measures. Comply with all applicable laws, regulations, permits, good engineering, environmental management, and construction practices.Unavoidable Adverse Environmental Impacts -. Small to moderate unavoidable adverse impacts of new transmission lines on land use.

Adverse Impact - Two 345 kv transmission lines in new corridor would be required.Mitigation Measure - Conduct siting study that takes into account environmental impacts. Incorporate recommendations of federal and state agencies into route selections. Site new corridors to avoid critical or sensitive habitats or species as much as possible. Restrict construction activities to transmission corridors and access roads. Restrict sites of access to corridors. Before site disturbance, conduct archaeological and ecological surveys and determine site-specific erosion control measures. Comply with all applicable laws, regulations, permits, good engineering, environmental management, and construction practices.Unavoidable Adverse Environmental Impacts - Small to large unavoidable adverse impacts of new transmission lines on land use.

Adverse Impactbuilt in the existexpanded.Mitigation Measinto account enrecommendatioroute selectionsor sensitive habRestrict construcorridors and acto corridors. Bearchaeological asite-specific eroall applicable laengineering, enconstruction praUnavoidable Adto moderate un

Table 10.4-4 Unavoidable Adverse Environmental Impacts of Proposed Project at Alter




Benefit-C

ost Balance

10.4-43

STP 3 & 4

Environmental R

eport

L(c

- Potential to disturb buried historic, or paleontological resources.ure - Select transmission routes to properties. Consult State Historic ficer. Before site disturbance, ological surveys. Develop and edure for construction activities that to protect cultural, historic, or resources.verse Environmental Impacts -

struction of unanticipated historic, ontological resources. Small verse impacts to cultural resources n.

- Construction debris would be ite and/or offsite landfills.ure - Use waste minimization to of debris.verse Environmental Impacts - idable adverse impacts to land use. ould be consumed for disposal of

bris and would not be available for r wastes.



Rev. 03

and Useontinued)

Adverse Impact - Potential to disturb buried historic, archaeological, or paleontological resources.Mitigation Measure - Consult State Historic Preservation Officer. Before site disturbance, conduct archaeological surveys. Develop and implement procedure for construction activities that includes actions to protect cultural, historic, or paleontological resources.Unavoidable Adverse Environmental Impacts - Potential for destruction of unanticipated historic, cultural, or paleontological resources. Small unavoidable adverse impacts to cultural resources from construction.

Adverse Impact - Potential to disturb buried historic, archaeological, or paleontological resources.Mitigation Measure - Select transmission routes to avoid historical properties. Consult State Historic Preservation Officer. Before site disturbance, conduct archaeological surveys. Develop and implement procedure for construction activities that includes actions to protect cultural, historic, or paleontological resources.Unavoidable Adverse Environmental Impacts - Potential for destruction of unanticipated historic, cultural, or paleontological resources. Small unavoidable adverse impacts to cultural resources from construction.

Adverse Impactarchaeological,Mitigation Measavoid historical Preservation Ofconduct archaeimplement procincludes actionspaleontological Unavoidable AdPotential for decultural, or paleunavoidable adfrom constructio

Adverse Impact - Construction debris would be disposed in onsite and/or offsite landfills.Mitigation Measure - Use waste minimization to reduce volume of debris.Unavoidable Adverse Environmental Impacts - Small unavoidable adverse impacts to land use. Landfill space would be consumed for disposal of construction debris and would not be available for disposal of other wastes.

Adverse Impact - Construction debris would be disposed in onsite and/or offsite landfills.Mitigation Measure - Use waste minimization to reduce volume of debris.Unavoidable Adverse Environmental Impacts - Moderately unavoidable adverse impacts to land use. Landfill space would be consumed for disposal of construction debris and would not be available for disposal of other wastes.

Adverse Impactdisposed in onsMitigation Measreduce volume Unavoidable AdModerate unavoLandfill space wconstruction dedisposal of othe





10.4-44B

enefit-Cost B

alance

STP 3 & 4

Environmental R

eport

HW

– Based on STP 3 & 4, construction p to 1200 gpm of groundwater.ure - Practice water conservation as er measures or controls would be

verse Environmental Impacts -. ble adverse impacts.

- Potential need to dewater s.ure - Install drainage system to divert ff to settling basin before discharge

itted TPDES outfall. Follow best actices for erosion control.verse Environmental Impacts - Small verse impacts.



Rev. 03

ydrology and ater Use

Adverse Impact – Based on STP 3 & 4, construction would require up to 1200 gpm of groundwater.Mitigation Measure - Practice water conservation as practical. No other measures or controls would be necessary.Unavoidable Adverse Environmental Impacts -. Small unavoidable adverse impacts.

Adverse Impact – Based on STP 3 & 4, construction would require up to 1200 gpm of groundwater.Mitigation Measure - Practice water conservation as practical. No other measures or controls would be necessary.Unavoidable Adverse Environmental Impacts -. Small unavoidable adverse impacts.

Adverse Impactwould require uMitigation Measpractical. No othnecessary. Unavoidable AdSmall unavoida

Adverse Impact - Potential need to dewater excavation areas.Mitigation Measure - Install drainage system to divert dewatering runoff to settling basin before discharge through a permitted TPDES outfall. Follow best management practices for erosion control.Unavoidable Adverse Environmental Impacts - Small unavoidable adverse impacts.

Adverse Impact - Potential need to dewater excavation areas.Mitigation Measure - Install drainage system to divert dewatering runoff to settling basin before discharge through a permitted TPDES outfall. Follow best management practices for erosion control.Unavoidable Adverse Environmental Impacts - Small unavoidable adverse impacts.

Adverse Impactexcavation areaMitigation Measdewatering runothrough a permmanagement prUnavoidable Adunavoidable ad





Benefit-C

ost Balance

10.4-45

STP 3 & 4

Environmental R

eport

HW(c

- Construction along river banks or n the case of the transmission line) sediments into waterways.ure - Develop and implement a PP Plan; conduct monitoring as

storm water general permit. Stabilize nd adjacent to shoreline construction n control devices and after

-seed the areas.

verse Environmental Impacts –Small verse impacts.

- Use of heavy equipment introduces f petroleum spills that could enter

ure - Use good maintenance intain equipment, and prevent spills are and implement SPCC Plan for tivities.



Rev. 03

ydrology and ater Useontinued)

Adverse Impact - Construction along river banks or stream banks could introduce sediments into waterways.Mitigation Measure - Develop and implement a construction Storm Water Pollution Prevention Plan (SWPP); conduct monitoring as required by the storm water general permit. Stabilize upslope areas and adjacent to shoreline construction sites with erosion control devices and after construction, re-seed the areas.

Adverse Impact - Construction along river banks or stream banks (in the case of the transmission line) could introduce sediments into waterways.Mitigation Measure - Develop and implement a construction SWPP Plan; conduct monitoring as required by the storm water general permit. Stabilize upslope areas and adjacent to shoreline construction sites with erosion control devices and after construction, re-seed the areas.

Adverse Impactstream banks (icould introduceMitigation Measconstruction SWrequired by the upslope areas asites with erosioconstruction, re

Unavoidable Adverse Environmental Impacts - Small unavoidable adverse impacts.

Unavoidable Adverse Environmental Impacts - Small unavoidable adverse impacts.

Unavoidable Adunavoidable ad

Adverse Impact - Use of heavy equipment introduces the possibility of petroleum spills that could enter surface water.Mitigation Measure - Use good maintenance practices to maintain equipment, and prevent spills and leaks. Prepare and implement Spill Prevention Control and Countermeasures (SPCC) Plan for construction activities.

Adverse Impact - Use of heavy equipment introduces the possibility of petroleum spills that could enter surface water.Mitigation Measure - Use good maintenance practices to maintain equipment, and prevent spills and leaks. Prepare and implement SPCC Plan for construction activities.

Adverse Impactthe possibility osurface water.Mitigation Measpractices to maand leaks. Prepconstruction ac





10.4-46B

enefit-Cost B

alance

STP 3 & 4

Environmental R

eport

HW(c

s using petroleum products and gnated areas that are equipped with t.verse Environmental Impacts - Small verse impacts.

A - Construction at rivers, lakes, and servoir, including an intake structure, loss of some organisms, and

adation of habitat. Transmission line ross streams would cause the loss of s and temporary degradation of



Rev. 03

ydrology and ater Useontinued)

Restrict activities using petroleum products and solvents to designated areas that are equipped with spill containment.Unavoidable Adverse Environmental Impacts - Small unavoidable adverse impacts.

Restrict activities using petroleum products and solvents to designated areas that are equipped with spill containment.Unavoidable Adverse Environmental Impacts - Small unavoidable adverse impacts.

Restrict activitiesolvents to desispill containmenUnavoidable Adunavoidable ad

quatic Ecology Adverse Impact - Construction along shoreline, including an intake structure, would cause the loss of some organisms, and temporary degradation of habitat. Transmission line construction across streams would cause the loss of some organisms and temporary degradation of habitat.

Adverse Impact - Construction at rivers, lakes, and the proposed reservoir, including an intake structure, would cause the loss of some organisms, and temporary degradation of habitat. Transmission line construction across streams would cause the loss of some organisms and temporary degradation of habitat.

Adverse Impactthe proposed rewould cause thetemporary degrconstruction acsome organismhabitat.





Benefit-C

ost Balance

10.4-47

STP 3 & 4

Environmental R

eport

A(c

ure - Install cofferdam and store ent and soils in spoils area

vent loading in wetlands and se storm water retention basins as

ding of spoils area after construction. plement a construction SWPP Plan; ring as required by the storm water Stabilize upslope areas and adjacent struction sites with erosion control

er construction, re-seed the areas.



Rev. 03

quatic Ecologyontinued)

Mitigation Measure - Install cofferdam and store excavated sediment and soils in spoils area designed to prevent loading in wetlands and watercourses; use storm water retention basins as needed; re-seeding of spoils area after construction. Develop and implement a construction SWPP Plan; conduct monitoring as required by the storm water general permit. Stabilize upslope areas and adjacent to shoreline construction sites with erosion control devices and after construction, re-seed the areas.

Mitigation Measure - Install cofferdam and store excavated sediment and soils in spoils area designed to prevent loading in wetlands and watercourses; use storm water retention basins as needed; re-seeding of spoils area after construction. Develop and implement a construction SWPP Plan; conduct monitoring as required by the storm water general permit. Stabilize upslope areas and adjacent to shoreline construction sites with erosion control devices and after construction, re-seed the areas.

Mitigation Measexcavated sedimdesigned to prewatercourses; uneeded; re-seeDevelop and imconduct monitogeneral permit. to shoreline condevices and aft





10.4-48B

enefit-Cost B

alance

STP 3 & 4

Environmental R

eport

A(c

and water bodies and sensitive areas plan transmission routes to minimize nds and water bodies that must be uipment specifically designed for tlands and streams, install erosion plement best management practices acts to aquatic ecosystems. Before e construction, conduct ecological termine site-specific erosion control re is potential for construction of a n line to degrade habitat of a listed

, work closely with the state agency nstruction schedule and construction are protective of the habitat and tion.

verse Environmental Impacts -Small verse impacts.



Rev. 03

quatic Ecologyontinued)

Avoid wetlands and water bodies and sensitive areas when possible; plan transmission routes to minimize impacts to wetlands and water bodies that must be crossed; use equipment specifically designed for work around wetlands and streams, install erosion controls, and implement best management practices to minimize impacts to aquatic ecosystems. Before transmission line construction, conduct ecological surveys and determine site-specific erosion control measures. If there is potential for construction of a new transmission line to degrade habitat of a listed aquatic species, work closely with the state agency to develop a construction schedule and construction techniques that are protective of the habitat and species in question.

Avoid wetlands and water bodies and sensitive areas when possible; plan transmission routes to minimize impacts to wetlands and water bodies that must be crossed; use equipment specifically designed for work around wetlands and streams, install erosion controls, and implement best management practices to minimize impacts to aquatic ecosystems. Before transmission line construction, conduct ecological surveys and determine site-specific erosion control measures. If there is potential for construction of a new transmission line to degrade habitat of a listed aquatic species, work closely with the state agency to develop a construction schedule and construction techniques that are protective of the habitat and species in question.

Avoid wetlands when possible; impacts to wetlacrossed; use eqwork around wecontrols, and imto minimize imptransmission linsurveys and demeasures. If thenew transmissioaquatic speciesto develop a cotechniques thatspecies in ques

Unavoidable Adverse Environmental Impacts -Small unavoidable adverse impacts.

Unavoidable Adverse Environmental Impacts -Small unavoidable adverse impacts.

Unavoidable Adunavoidable ad





Benefit-C

ost Balance

10.4-49

STP 3 & 4

Environmental R

eport

T Habitat loss and potential impacts to ndangered plants or animals at or in lacement of animals from the . Loss of less mobile individual

ial degradation of wetlands.ure - Land clearing would be rding to federal and state regulations nt procedures, good construction stablished best management dule equipment maintenance inimize emission and spills. Minimize watering. Delineate wetlands and cts and mitigation prior to beginning tivitiesverse Environmental Impacts – Small porary impacts to habitat and wildlife

truction phase of the project



Rev. 03

errestrial Ecology Adverse Impact - Habitat loss, and potential impacts to threatened or endangered plants or animals at the site or in the vicinity. Displacement of animals from the construction site. Loss of less mobile individual animals. Potential degradation of wetlands.Mitigation Measure - Land clearing would be conducted according to federal and state regulations and permits, plant procedures, good construction practices, and established best management practices. Schedule equipment maintenance procedures to minimize emission and spills. Minimize fugitive dust by watering. Delineate wetlands and determine impacts and mitigation prior to beginning construction activitiesUnavoidable Adverse Environmental Impacts - Small, temporary impacts to habitat and wildlife during the construction phase of the project

Adverse Impact - Habitat loss, and potential impacts to threatened or endangered plants or animals at the site or in the vicinity. Displacement of animals from the construction site. Loss of less mobile individual animals. Potential degradation of wetlands.Mitigation Measure - Land clearing would be conducted according to federal and state regulations and permits, plant procedures, good construction practices, and established best management practices. Schedule equipment maintenance procedures to minimize emission and spills. Minimize fugitive dust by watering. Delineate wetlands and determine impacts and mitigation prior to beginning construction activitiesUnavoidable Adverse Environmental Impacts - Small, temporary impacts to habitat and wildlife during the construction phase of the project

Adverse Impactthreatened or ethe vicinity. Dispconstruction siteanimals. PotentMitigation Measconducted accoand permits, plapractices, and epractices. Scheprocedures to mfugitive dust by determine impaconstruction acUnavoidable Adto moderate temduring the cons





10.4-50B

enefit-Cost B

alance

STP 3 & 4

Environmental R

eport

S - Temporary and localized noise, d exhaust emissions during

ure - Train and appropriately protect rkers to reduce the risk of potential se, dust and exhaust emissions.

nouncements or prior notification of onstruction activities. Regularly

intain equipment to include exhaust cts. Phase construction to minimize . Restrict noise-related activities to Restrict delivery times to daylight and implement a dust control plan itigation measures such as watering stabilizing construction roads, activities and ceasing them during

verse Environmental Impacts – ry and localized noise, fugitive dust, issions during construction.

- Construction workers could upational illnesses, injuries, or death.



Rev. 03

ocioeconomic Adverse Impact - Temporary and localized noise, fugitive dust, and exhaust emissions during construction.Mitigation Measure - Train and appropriately protect construction workers to reduce the risk of potential exposure to noise, dust and exhaust emissions.

Adverse Impact - Temporary and localized noise, fugitive dust, and exhaust emissions during construction.Mitigation Measure - Train and appropriately protect construction workers to reduce the risk of potential exposure to noise, dust and exhaust emissions.

Adverse Impactfugitive dust, anconstruction.Mitigation Measconstruction woexposure to noi

Make public announcements or prior notification of atypically loud construction activities. Regularly inspect and maintain equipment to include exhaust and noise aspects. Phase construction to minimize daily emissions. Restrict noise-related activities to daylight hours. Restrict delivery times to daylight hours. Develop and implement a dust control plan that includes mitigation measures such as watering unpaved roads, stabilizing construction roads, phasing grading activities and ceasing them during high winds, etc.Unavoidable Adverse Environmental Impacts – Small temporary and localized noise, fugitive dust, and exhaust emissions during construction.

Make public announcements or prior notification of atypically loud construction activities. Regularly inspect and maintain equipment to include exhaust and noise aspects. Phase construction to minimize daily emissions. Restrict noise-related activities to daylight hours. Restrict delivery times to daylight hours. Develop and implement a dust control plan that includes mitigation measures such as watering unpaved roads, stabilizing construction roads, phasing grading activities and ceasing them during high winds, etc.Unavoidable Adverse Environmental Impacts – Small, temporary and localized noise, fugitive dust, and exhaust emissions during construction.

Make public anatypically loud cinspect and maand noise aspedaily emissionsdaylight hours. hours. Developthat includes munpaved roads,phasing gradinghigh winds, etc.Unavoidable AdSmall, temporaand exhaust em

Adverse Impact - Construction workers could experience occupational illnesses, injuries, or death.

Adverse Impact - Construction workers could experience occupational illnesses, injuries, or death.

Adverse Impactexperience occ





Benefit-C

ost Balance

10.4-51

STP 3 & 4

Environmental R

eport

S(c

ure - Train contractors on safety equire construction contractors and to develop and implement safety vide onsite services for emergency t regular health and safety

verse Environmental Impacts - ry impacts during the construction ject.

- Increased traffic on local roads.ure - Develop construction

affic plan prior to the start of d turn lanes at construction

signs near construction entrances e the public aware of potentially high

ffic areas.verse Environmental Impacts – Small erse impacts during construction due ffic on local roads

– Increase in demand for housing.



Rev. 03

ocioeconomicontinued)

Mitigation Measure - Train contractors on safety requirements. Require construction contractors and subcontractors to develop and implement safety procedures. Provide onsite services for emergency first aid; conduct regular health and safety monitoring.

Mitigation Measure - Train contractors on safety requirements. Require construction contractors and subcontractors to develop and implement safety procedures. Provide onsite services for emergency first aid; conduct regular health and safety monitoring.

Mitigation Measrequirements. Rsubcontractors procedures. Profirst aid; conducmonitoring.

Unavoidable Adverse Environmental Impacts - Small, temporary impacts during the construction phase of the project

Unavoidable Adverse Environmental Impacts - Small, temporary impacts during the construction phase of the project

Unavoidable AdSmall, temporaphase of the pro

Adverse Impact - Increased traffic on local roads. Mitigation Measure - Develop construction management traffic plan prior to the start of construction. Add turn lanes at construction entrance. Post signs near construction entrances and exits to make the public aware of potentially high construction traffic areas.Unavoidable Adverse Environmental Impacts – Small to moderate adverse impacts during construction due to Increased traffic on local roads.

Adverse Impact - Increased traffic on local roads. Mitigation Measure - Develop construction management traffic plan prior to the start of construction. Add turn lanes at construction entrance. Post signs near construction entrances and exits to make the public aware of potentially high construction traffic areas.Unavoidable Adverse Environmental Impacts - Small to moderate adverse impacts during construction due to Increased traffic on local roads.

Adverse ImpactMitigation Measmanagement trconstruction. Adentrance. Post and exits to makconstruction traUnavoidable Adto moderate advto Increased tra

Adverse Impact – Increase in demand for housing.

Adverse Impact – Increase in demand for housing.

Adverse Impact





10.4-52B

enefit-Cost B

alance

STP 3 & 4

Environmental R

eport

S(c

sure - Discuss construction plans influx of workers with community s and developers would meet the itional housing, and because the ng lead time, and the construction build gradually, it is likely that if the

cipates the increase in population, ng would always be available.

verse Environmental Impacts – ge short-lived unavoidable adverse

– Initially there may be insufficient e for the influx of construction .



Rev. 03


Mitigation Measure - Discuss construction plans and anticipated influx of workers with community leaders. Builders and developers would meet the demand for additional housing, and because the project has a long lead time, and the construction workforce would build gradually, it is likely that if the community anticipates the increase in population, adequate affordable housing would always be available.

Mitigation Measure - Discuss construction plans and anticipated influx of workers with community leaders. Builders and developers would meet the demand for additional housing, and because the project has a long lead time, and the construction workforce would build gradually, it is likely that if the community anticipates the increase in population, adequate affordable housing would always be available.

. Mitigation Meaand anticipatedleaders. Builderdemand for addproject has a loworkforce wouldcommunity antiadequate housi

Unavoidable Adverse Environmental Impacts – Moderate to large short-lived unavoidable adverse impacts.

Unavoidable Adverse Environmental Impacts – Moderate to large short-lived unavoidable adverse impacts.

Unavoidable AdModerate to larimpacts.

Adverse Impact - Initially there may be insufficient classroom space for the influx of construction workers families.

Adverse Impact - Initially there may be insufficient classroom space for the influx of construction workers families.

Adverse Impactclassroom spacworkers families





Benefit-C

ost Balance

10.4-53

STP 3 & 4

Environmental R

eport

S(c

ure - Discuss construction plans and x of workers with community leaders. venues as a result of the large ject would fund additional school use the project has a long lead time,

ction workforce would build gradually, the community anticipates the ulation, adequate classroom space e available.

verse Environmental Impacts – rge temporary unavoidable adverse

- Increase in demand for public

ure Discuss construction plans and x of workers with community leaders. venues after construction begins

o purchase additional ent and hire/train additional staff, if

verse Environmental Impacts – Small ary unavoidable adverse impacts.



Rev. 03


Mitigation Measure - Discuss construction plans and anticipated influx of workers with community leaders. Increased tax revenues as a result of the large construction project would fund additional school resources. Because the project has a long lead time, and the construction workforce would build gradually, it is likely that if the community anticipates the increase in population, adequate classroom space would always be available.

Mitigation Measure - Discuss construction plans and anticipated influx of workers with community leaders. Increased tax revenues as a result of the large construction project would fund additional school resources. Because the project has a long lead time, and the construction workforce would build gradually, it is likely that if the community anticipates the increase in population, adequate classroom space would always be available.

Mitigation Measanticipated influIncreased tax reconstruction proresources. Becaand the construit is likely that ifincrease in popwould always b

Unavoidable Adverse Environmental Impacts – Moderate to Large temporary unavoidable adverse impacts.

Unavoidable Adverse Environmental Impacts – Moderate to Large temporary unavoidable adverse impacts.

Unavoidable AdModerate to Laimpacts.

Adverse Impact - Increase in demand for public services.

Adverse Impact - Increase in demand for public services.

Adverse Impactservices.

Mitigation Measure Discuss construction plans and anticipated influx of workers with community leaders. Increased tax revenues after construction begins could be used to purchase additional facilities/equipment and hire/train additional staff, if necessary.

Mitigation Measure Discuss construction plans and anticipated influx of workers with community leaders. Increased tax revenues after construction begins could be used to purchase additional facilities/equipment and hire/train additional staff, if necessary.

Mitigation Measanticipated influIncreased tax recould be used tfacilities/equipmnecessary.

Unavoidable Adverse Environmental Impacts – Small to large temporary unavoidable adverse impacts.

Unavoidable Adverse Environmental Impacts – Small to large temporary unavoidable adverse impacts.

Unavoidable Adto large tempor





10.4-54B

enefit-Cost B

alance

STP 3 & 4

Environmental R

eport

R - None. The site is undeveloped so workers would not be exposed to

ure - No mitigation required.verse Environmental Impacts - No verse impacts.

AM

- Temporary and localized noise, d exhaust emissions during

ure - Regularly inspect and maintain se construction to minimize daily elop and implement a dust control es mitigation measures such as ed roads, stabilizing construction grading activities and ceasing them ds, etc.verse Environmental Impacts -

ry impacts from localized noise, d exhaust emissions during



Rev. 03

adiological Adverse Impact – None. The site is currently a coal fired plant that does not house any radioactive materials. Mitigation Measure - No mitigation required.Unavoidable Adverse Environmental Impacts - No unavoidable adverse impacts.

Adverse Impact - None. The site is undeveloped so the construction workers would not be exposed to radiation.Mitigation Measure - No mitigation required.Unavoidable Adverse Environmental Impacts - No unavoidable adverse impacts.

Adverse Impactthe constructionradiation.Mitigation MeasUnavoidable Adunavoidable ad

tmospheric and eteorological

Adverse Impact - Temporary and localized noise, fugitive dust, and exhaust emissions during constructionMitigation Measure - Regularly inspect and maintain equipment. Phase construction to minimize daily emissions. Develop and implement a dust control plan that includes mitigation measures such as watering unpaved roads, stabilizing construction roads, phasing grading activities and ceasing them during high winds, etc.Unavoidable Adverse Environmental Impacts – Small, temporary impacts from localized noise, fugitive dust, and exhaust emissions during construction.

Adverse Impact - Temporary and localized noise, fugitive dust, and exhaust emissions during constructionMitigation Measure - Regularly inspect and maintain equipment. Phase construction to minimize daily emissions. Develop and implement a dust control plan that includes mitigation measures such as watering unpaved roads, stabilizing construction roads, phasing grading activities and ceasing them during high winds, etc.Unavoidable Adverse Environmental Impacts - Small, temporary impacts from localized noise, fugitive dust, and exhaust emissions during construction.

Adverse Impactfugitive dust, anconstructionMitigation Measequipment. Phaemissions. Devplan that includwatering unpavroads, phasing during high winUnavoidable AdSmall, temporafugitive dust, anconstruction.





Benefit-C

ost Balance

10.4-55

STP 3 & 4

Environmental R

eport

EJ

- No disproportionately high or s on minority or low-income ulting from construction of the nits have been identified. ure - None required.verse Environmental Impacts - Small verse impacts.

L - Operating the new units would ctive and non-radioactive wastes that be disposed in permitted disposal itted landfills. Generation of spent

disposal in a geologic repository.

ure - Disposal area(s) would be a disposal facility with a land use uch activities. Disposal area would

der appropriate regulations and such time a NRC licensed high-level facility is constructed. At that time, a could be restored for other uses.



Rev. 03

nvironmental ustice

Adverse Impact - No disproportionately high or adverse impacts on minority or low-income populations from construction of the proposed new units have been identified. Mitigation Measure - None required.Unavoidable Adverse Environmental Impacts - Small unavoidable adverse impacts.

Adverse Impact - No disproportionately high or adverse impacts on minority or low-income populations resulting from construction of the proposed new units have been identified. Mitigation Measure - None required.Unavoidable Adverse Environmental Impacts - Small unavoidable adverse impacts.

Adverse Impactadverse impactpopulations resproposed new uMitigation MeasUnavoidable Adunavoidable ad

Operations-Related

and Use Adverse Impact - Operating the new units would generate radioactive and non-radioactive wastes that are required to be disposed in permitted disposal facilities or permitted landfills. Generation of spent fuel will require disposal in a geologic repository.

Adverse Impact - Operating the new units would generate radioactive and non-radioactive wastes that are required to be disposed in permitted disposal facilities or permitted landfills. Generation of spent fuel will require disposal in a geologic repository.

Adverse Impactgenerate radioaare required to facilities or permfuel will require

Mitigation Measure - Disposal area(s) would be a permitted waste disposal facility with a land use designated for such activities. Disposal area would be operated under appropriate regulations and guidelines until such time a NRC licensed high-level waste disposal facility is constructed. At that time, the storage area could be restored for other uses.

Mitigation Measure - Disposal area(s) would be a permitted waste disposal facility with a land use designated for such activities. Disposal area would be operated under appropriate regulations and guidelines until such time a NRC licensed high-level waste disposal facility is constructed. At that time, the storage area could be restored for other uses.

Mitigation Measpermitted wastedesignated for sbe operated unguidelines until waste disposal the storage are





10.4-56B

enefit-Cost B

alance

STP 3 & 4

Environmental R

eport

L(c

verse Environmental Impacts - Small pacts Some land would be dedicated dfills or licensed disposal facilities e available for other uses.

- Approximately 21 acres of land will dedicated and 160 will be mitted to the uranium fuel cycle ration.ure - No mitigation would be requiredverse Environmental Impacts - Small

pacts 160 acres of land will not be ecommissioning of the plant resulting idable impact. 21 acres will never be

ure use.



Rev. 03

and Useontinued)

Unavoidable Adverse Environmental Impacts – Small unavoidable impacts. Some land would be dedicated to permitted landfills or licensed disposal facilities and would not be available for other uses.

Unavoidable Adverse Environmental Impacts - Small unavoidable impacts Some land would be dedicated to permitted landfills or licensed disposal facilities and would not be available for other uses.

Unavoidable Adunavoidable imto permitted lanand would not b

Adverse Impact - Approximately 21 acres of land will be permanently dedicated and 160 will be temporarily committed to the uranium fuel cycle during plant operation. Mitigation Measure - No mitigation would be requiredUnavoidable Adverse Environmental Impacts - Small unavoidable impacts 160 acres of land will not be available until decommissioning of the plant resulting in a small unavoidable impact. 21 acres will never be available for future use.

Adverse Impact - Approximately 21 acres of land will be permanently dedicated and 160 will be temporarily committed to the uranium fuel cycle during plant operation. Mitigation Measure - No mitigation would be requiredUnavoidable Adverse Environmental Impacts - Small unavoidable impacts 160 acres of land will not be available until decommissioning of the plant resulting in a small unavoidable impact. 21 acres will never be available for future use.

Adverse Impactbe permanentlytemporarily comduring plant opeMitigation MeasUnavoidable Adunavoidable imavailable until din a small unavoavailable for fut





Benefit-C

ost Balance

10.4-57

STP 3 & 4

Environmental R

eport

HW

- Operations would result in all amounts of chemicals to Texas

ure - All discharges would comply rmit and applicable water quality are and implement a SWPP plan to releases of contaminated storm and implement a SPCC plan to contamination from spills.verse Environmental Impacts -Small verse impacts.

- Maintenance activities at the site ansmission line could result in small .ure - Prepare and implement a void/minimize contamination from the SPCC plan when working on es.verse Environmental Impacts –Small verse impacts.



Rev. 03

ydrology and ater Use

Adverse Impact - Operations would result in discharge of small amounts of chemicals to Texas waters Mitigation Measure - All discharges would comply with TPDES permit and applicable water quality standards. Prepare and implement a SWPP plan to avoid/ minimize releases of contaminated storm water. Prepare and implement a SPCC plan to avoid/minimize contamination from spills.Unavoidable Adverse Environmental Impacts - Small unavoidable adverse impacts.

Adverse Impact - Operations would result in discharge of small amounts of chemicals to Texas water. Mitigation Measure - All discharges would comply with TPDES permit and applicable water quality standards. Prepare and implement a SWPP plan to avoid/ minimize releases of contaminated storm water. Prepare and implement a SPCC plan to avoid/minimize contamination from spills.Unavoidable Adverse Environmental Impacts - Small unavoidable adverse impacts.

Adverse Impactdischarge of smwaters.Mitigation Measwith TPDES pestandards. Prepavoid/ minimizewater. Prepare avoid/minimize Unavoidable Adunavoidable ad

Adverse Impact - Maintenance activities at the site and along the transmission line could result in small petroleum spills.Mitigation Measure - Prepare and implement a SPCC plan to avoid/minimize contamination from spills. Adhere to the SPCC plan when working on transmission lines.Unavoidable Adverse Environmental Impacts –Small unavoidable adverse impacts.

Adverse Impact - Maintenance activities at the site and along the transmission line could result in small petroleum spills.Mitigation Measure - Prepare and implement a SPCC plan to avoid/minimize contamination from spills. Adhere to the SPCC plan when working on transmission lines.Unavoidable Adverse Environmental Impacts –Small unavoidable adverse impacts.

Adverse Impactand along the trpetroleum spillsMitigation MeasSPCC plan to aspills. Adhere totransmission linUnavoidable Adunavoidable ad





10.4-58B

enefit-Cost B

alance

STP 3 & 4

Environmental R

eport

HW(c

– Surface water consumption from

ure - Design and operate intake d on best available technology. gical impacts as required by water ication to existing long-range water ans for region.verse Environmental Impacts – Small verse impacts

- Operations may result in a small ischarged Texas waters.ure - The differences between plume d ambient water temperature would ithin limits set in the TPDES permit.verse Environmental Impacts - Small verse impacts.

- Water consumption and discharges activities.ure - No mitigation would be



Rev. 03

ydrology and ater Use ontinued)

Adverse Impact –Water required for site operation will be obtained from Carrizo-Wilcox Aquifer and Lake Limestone.Mitigation Measure - Design and operate intake structures based on best available technology. Monitor hydrological impacts as required by water permit(s). Unavoidable Adverse Environmental Impacts - Small unavoidable adverse impacts

Adverse Impact – Adequate groundwater is available; however Allens Creek reservoir would need to be constructed for the plant.Mitigation Measure - Design and operate intake structures based on best available technology. Monitor hydrological impacts as required by water permit(s). Unavoidable Adverse Environmental Impacts – Small to moderate unavoidable adverse impacts

Adverse ImpactPalestine LakeMitigation Measstructures baseMonitor hydrolopermit(s). Modifmanagement plUnavoidable Adunavoidable ad

Adverse Impact - Operations may result in a small thermal plume discharged to Texas waters. Mitigation Measure - The differences between plume temperature and ambient water temperature would be maintained within limits set in the TPDES permit.Unavoidable Adverse Environmental Impacts - Small unavoidable adverse impacts.

Adverse Impact - Operations may result in a small thermal plume discharged to Texas waters.Mitigation Measure - The differences between plume temperature and ambient water temperature would be maintained within limits set in the TPDES permit.Unavoidable Adverse Environmental Impacts - Small unavoidable adverse impacts.

Adverse Impactthermal plume dMitigation Meastemperature anbe maintained wUnavoidable Adunavoidable ad

Adverse Impact - Water consumption and discharges during fuel cycle activities.Mitigation Measure - No mitigation would be required.

Adverse Impact - Water consumption and discharges during fuel cycle activities.Mitigation Measure - No mitigation would be required.

Adverse Impactduring fuel cycleMitigation Measrequired.





Benefit-C

ost Balance

10.4-59

STP 3 & 4

Environmental R

eport

HW(c

verse Environmental Impacts - Small verse impacts. Consumptive use of from fuel cycle. Total annual water cycle would be 1.82 x 1010 gallons

A - Operations would result in all amounts of chemicals to Texas

ure - The TPDES permit limits are set ischarges do not significantly affect ions or water quality.verse Environmental Impacts - Small verse impacts on aquatic ecology

- Potential impacts to aquatic petroleum spills from routine tivities near water.ure - Prepare and implement a void/minimize contamination from

verse Environmental Impacts - Small verse impacts.



Rev. 03

ydrology and ater Use ontinued)

Unavoidable Adverse Environmental Impacts – Small unavoidable adverse impacts. Consumptive use of water resources from fuel cycle. Total annual water use for the fuel cycle would be 1.82 x 1010 gallons per unit.

Unavoidable Adverse Environmental Impacts - Small unavoidable adverse impacts. Consumptive use of water resources from fuel cycle. Total annual water use for the fuel cycle would be 1.82 x 1010 gallons per unit.

Unavoidable Adunavoidable adwater resourcesuse for the fuel per unit.

quatic Ecology Adverse Impact - Operations would result in discharge of small amounts of chemicals to Texas waters.Mitigation Measure - The TPDES permit limits are set to ensure that discharges do not significantly affect aquatic populations or water quality.Unavoidable Adverse Environmental Impacts - Small unavoidable adverse impacts on aquatic ecology.

Adverse Impact - Operations would result in discharge of small amounts of chemicals to Texas waters Mitigation Measure - The TPDES permit limits are set to ensure that discharges do not significantly affect aquatic populations or water quality.Unavoidable Adverse Environmental Impacts - Small unavoidable adverse impacts on aquatic ecology

Adverse Impactdischarge of smwaters.Mitigation Measto ensure that daquatic populatUnavoidable Adunavoidable ad

Adverse Impact – Potential impacts to aquatic ecology due to petroleum spills from routine maintenance activities near water.Mitigation Measure - Prepare and implement a SPCC Plan to avoid/minimize contamination from spills.Unavoidable Adverse Environmental Impacts - Small unavoidable adverse impacts.

Adverse Impact - Potential impacts to aquatic ecology due to petroleum spills from routine maintenance activities near water.Mitigation Measure - Prepare and implement a SPCC Plan to avoid/minimize contamination from spills.Unavoidable Adverse Environmental Impacts - Small unavoidable adverse impacts.

Adverse Impactecology due to maintenance acMitigation MeasSPCC Plan to aspills.Unavoidable Adunavoidable ad





10.4-60B

enefit-Cost B

alance

STP 3 & 4

Environmental R

eport

A(c

– Impacts to aquatic biota from ntrainment and thermal discharges.ure - Intake structure designed with ology Available”. verse Environmental Impacts - Small verse impacts.

T – Potential impacts from cooling n design.ure - None required.verse Environmental Impacts - Small verse impacts.

- Episodic loud noises at the site or ion lines could frighten animals.ure - Animal displacement due to temporary in nature. verse Environmental Impacts – Small oidable adverse impacts.



Rev. 03

quatic Ecology ontinued)

Adverse Impact – Impacts to aquatic biota from impingement, entrainment and thermal discharges.Mitigation Measure - Intake structure designed with the “Best Technology Available”. Use of cooling towers that minimize withdrawal of river water.Unavoidable Adverse Environmental Impacts - Small unavoidable adverse impacts.

Adverse Impact – Impacts to aquatic biota from impingement, entrainment and thermal discharges.Mitigation Measure - Intake structure designed with the “Best Technology Available”.Unavoidable Adverse Environmental Impacts – Small unavoidable adverse impacts.

Adverse Impactimpingement, eMitigation Measthe “Best TechnUnavoidable Adunavoidable ad

errestrial Ecology Adverse Impact – No adverse impacts from dry cooling tower are anticipated.Mitigation Measure - None required.Unavoidable Adverse Environmental Impacts - No unavoidable adverse impacts.

Adverse Impact – Potential impacts from cooling towers, based on design.Mitigation Measure - None required.Unavoidable Adverse Environmental Impacts - Small unavoidable adverse impacts.

Adverse Impacttowers, based oMitigation MeasUnavoidable Adunavoidable ad

Adverse Impact - Episodic loud noises at the site or along transmission lines could frighten animals.Mitigation Measure - Animal displacement due to noise should be temporary in nature. Unavoidable Adverse Environmental Impacts – Small temporary unavoidable adverse impacts.

Adverse Impact - Episodic loud noises at the site or along transmission lines could frighten animals.Mitigation Measure - Animal displacement due to noise should be temporary in nature. Unavoidable Adverse Environmental Impacts – Small temporary unavoidable adverse impacts.

Adverse Impactalong transmissMitigation Measnoise should beUnavoidable Adtemporary unav





Benefit-C

ost Balance

10.4-61

STP 3 & 4

Environmental R

eport

T(c

- Potential impacts to vegetation and e transmission line rights of way from ance of woody vegetative growth by chanical methods and herbicides.

ure – Implement existing procedures line maintenance designed to fauna. Train personnel in the

and lubricants and the clean-up and incidental spills. Have adequate spill ment on hand during maintenance corridors. verse Environmental Impacts - Small voidable adverse impacts during the

S - The plants emit low noise. ure - Noise levels would normally not round at the site boundary. No essary.verse Environmental Impacts - Small verse impacts.



Rev. 03

errestrial Ecology ontinued)

Adverse Impact - Potential impacts to vegetation and habitat within the transmission line rights of way from routine maintenance of woody vegetative growth by manual and mechanical methods and herbicides.

Adverse Impact - Potential impacts to vegetation and habitat within the transmission line rights of way from routine maintenance of woody vegetative growth by manual and mechanical methods and herbicides.

Adverse Impacthabitat within throutine maintenmanual and me

Mitigation Measure – Implement existing procedures for transmission line maintenance designed to protect flora and fauna. Train personnel in the handling of fuel and lubricants and the clean-up and reporting of any incidental spills. Have adequate spill response equipment on hand during maintenance activities in the corridors. Unavoidable Adverse Environmental Impacts - Small unavoidable adverse impacts during the life of the plant

Mitigation Measure – Implement existing procedures for transmission line maintenance designed to protect flora and fauna. Train personnel in the handling of fuel and lubricants and the clean-up and reporting of any incidental spills. Have adequate spill response equipment on hand during maintenance activities in the corridors. Unavoidable Adverse Environmental Impacts - Small unavoidable adverse impacts during the life of the plant

Mitigation Measfor transmissionprotect flora andhandling of fuelreporting of anyresponse equipactivities in the Unavoidable Adto moderate unalife of the plant

ocioeconomic Adverse Impact - The plants emit low noise. Mitigation Measure - Noise levels would normally not be above background at the site boundary. No mitigation is necessary.Unavoidable Adverse Environmental Impacts - Small unavoidable adverse impacts.

Adverse Impact - The plants emit low noise. Mitigation Measure - Noise levels would normally not be above background at the site boundary. No mitigation is necessary.Unavoidable Adverse Environmental Impacts –Small unavoidable adverse impacts.

Adverse ImpactMitigation Measbe above backgmitigation is necUnavoidable Adunavoidable ad





10.4-62B

enefit-Cost B

alance

STP 3 & 4

Environmental R

eport

S(c

- Episodic loud noises could annoy s. ure - Handle incidents on a case-by-

verse Environmental Impacts - ry unavoidable adverse impacts.

– Increase in demand for housing in Navarro Counties. ure - Discuss anticipated influx of mmunity leaders. Builders and ld meet the demand for additional cause the project has a long lead

that if the community anticipates the ulation, adequate affordable housing e available

verse Environmental Impacts – Small able adverse impacts.



Rev. 03

ocioeconomic ontinued)

Adverse Impact - Episodic loud noises could annoy nearby residents. Mitigation Measure - Handle incidents on a case-by-case basis.Unavoidable Adverse Environmental Impacts - Small, temporary unavoidable adverse impacts.

Adverse Impact - Episodic loud noises could annoy nearby residents. Mitigation Measure - Handle incidents on a case-by-case basis.Unavoidable Adverse Environmental Impacts - Small, temporary unavoidable adverse impacts.

Adverse Impactnearby residentMitigation Meascase basis.Unavoidable AdSmall, tempora

Adverse Impact – Increase in demand for housing in Freestone, Limestone, and Leon Counties. Mitigation Measure - Discuss anticipated influx of workers with community leaders. Builders and developers would meet the demand for additional housing, and because the project has a long lead time, it is likely that if the community anticipates the increase in population, adequate affordable housing would always be available.

Adverse Impact – Increase in demand for housing in Austin, Fort Bend, and Waller Counties. Mitigation Measure - Discuss anticipated influx of workers with community leaders. Builders and developers would meet the demand for additional housing, and because the project has a long lead time, it is likely that if the community anticipates the increase in population, adequate affordable housing would always be available

Adverse ImpactHenderson andMitigation Measworkers with codevelopers wouhousing, and betime, it is likely increase in popwould always b


Unavoidable Adverse Environmental Impacts – Small to large unavoidable adverse impacts.

Unavoidable Adto large unavoid





Benefit-C

ost Balance

10.4-63

STP 3 & 4

Environmental R

eport

S(c

- Increase in demand for classroom

ure - Discuss construction plans and x of workers with community leaders. venues as a result of the large ject would fund additional school use the project has a long lead time,

the community anticipates the ulation, adequate classroom space e available.verse Environmental Impacts - Small

avoidable adverse impacts.

- Increase in demand for public

ure Discuss anticipated influx of mmunity leaders. Increased tax onstruction begins could be used to

onal facilities/equipment and nal staff, if necessary.

verse Environmental Impacts – Small avoidable adverse impacts.



Rev. 03


Adverse Impact - Increase in demand for classroom space. Mitigation Measure - Discuss construction plans and anticipated influx of workers with community leaders. Increased tax revenues as a result of the large construction project would fund additional school resources. Because the project has a long lead time, it is likely that if the community anticipates the increase in population, adequate classroom space would always be available.Unavoidable Adverse Environmental Impacts – Small to moderate unavoidable adverse impacts.

Adverse Impact - Increase in demand for classroom space.Mitigation Measure - Discuss construction plans and anticipated influx of workers with community leaders. Increased tax revenues as a result of the large construction project would fund additional school resources. Because the project has a long lead time, it is likely that if the community anticipates the increase in population, adequate classroom space would always be available.Unavoidable Adverse Environmental Impacts – Small to moderate unavoidable adverse impacts.

Adverse Impactspace. Mitigation Measanticipated influIncreased tax reconstruction proresources. Becait is likely that ifincrease in popwould always bUnavoidable Adto moderate un

Adverse Impact - Increase in demand for public services Mitigation Measure Discuss anticipated influx of workers with community leaders. Increased tax revenues after construction begins could be used to purchase additional facilities/equipment and hire/train additional staff, if necessary.

Adverse Impact - Increase in demand for public servicesMitigation Measure Discuss anticipated influx of workers with community leaders. Increased tax revenues after construction begins could be used to purchase additional facilities/equipment and hire/train additional staff, if necessary.

Adverse Impactservices. Mitigation Measworkers with corevenues after cpurchase additihire/train additio



Unavoidable Adto moderate un





10.4-64B

enefit-Cost B

alance

STP 3 & 4

Environmental R

eport

S(c

- New transmission line has potential ic shock in people standing near the

ure - Build transmission line to NESC e noise and electric shock.verse Environmental Impacts - Small verse impacts.

- Additional cooling towers may viewscape. ure - No mitigation needed. verse Environmental Impacts - Small verse impacts.

– Operation of two units would ffic on local roads during shift s at the site would increase traffic

ure –Consider staggering outage plant-associated traffic on local roads nges.verse Environmental Impacts – Small verse impacts.



Rev. 03


Adverse Impact - New transmission line has potential to induce electric shock in people standing near the line. Mitigation Measure - Build transmission line to NESC code to minimize noise and electric shock.Unavoidable Adverse Environmental Impacts - Small unavoidable adverse impacts.

Adverse Impact - New transmission line has potential to induce electric shock in people standing near the line. Mitigation Measure - Build transmission line to NESC code to minimize noise and electric shock.Unavoidable Adverse Environmental Impacts - Small unavoidable adverse impacts.

Adverse Impactto induce electrline. Mitigation Meascode to minimizUnavoidable Adunavoidable ad

Adverse Impact - Additional cooling towers may impact existing viewscape. Mitigation Measure - No mitigation needed.Unavoidable Adverse Environmental Impacts - Small unavoidable adverse impacts.

Adverse Impact - Additional cooling towers may impact existing viewscape. Mitigation Measure - No mitigation needed. Unavoidable Adverse Environmental Impacts - Small unavoidable adverse impacts.

Adverse Impactimpact existing Mitigation MeasUnavoidable Adunavoidable ad

Adverse Impact - Operation of two units would increase the traffic on local roads during shift change. Outages at the site would increase traffic even further. Mitigation Measure – Consider staggering outage shifts to reduce plant-associated traffic on local roads during shift changes.Unavoidable Adverse Environmental Impacts – Small unavoidable adverse impacts.

Adverse Impact - Two additional units would increase the traffic on local roads during shift change. Outages at the site would increase traffic even further. Mitigation Measure –Consider staggering outage shifts to reduce plant-associated traffic on local roads during shift changes.Unavoidable Adverse Environmental Impacts – Small unavoidable adverse impacts.

Adverse Impactincrease the trachange. Outageeven further. Mitigation Measshifts to reduce during shift chaUnavoidable Adunavoidable ad





Benefit-C

ost Balance

10.4-65

STP 3 & 4

Environmental R

eport

S(c

- Potential for occupational injuries

ure - Implement industrial safety

verse Environmental Impacts - Small verse impacts.

- Consumption of fossil fuels during ocess would be small relative to the n. ure - No mitigation needed.verse Environmental Impacts - Small verse impacts.

R - Potential doses to members of the ases to air and surface water. ure - All releases would be well y limits. No mitigation required.verse Environmental Impacts - Small verse impacts.

- Fuel cycle activities would have s. ure - No mitigation needed.verse Environmental Impacts - Small verse impacts.



Rev. 03


Adverse Impact - Potential for occupational injuries and illnesses. Mitigation Measure - Implement industrial safety program.Unavoidable Adverse Environmental Impacts - Small unavoidable adverse impacts.

Adverse Impact - Potential for occupational injuries and illnesses. Mitigation Measure - Implement industrial safety program.Unavoidable Adverse Environmental Impacts - Small unavoidable adverse impacts.

Adverse Impactand illnesses. Mitigation Measprogram.Unavoidable Adunavoidable ad

Adverse Impact - Consumption of fossil fuels during the fuel cycle process would be small relative to the power production. Mitigation Measure - No mitigation needed.Unavoidable Adverse Environmental Impacts - Small unavoidable adverse impacts.

Adverse Impact - Consumption of fossil fuels during the fuel cycle process would be small relative to the power production. Mitigation Measure - No mitigation needed.Unavoidable Adverse Environmental Impacts - Small unavoidable adverse impacts.

Adverse Impactthe fuel cycle prpower productioMitigation MeasUnavoidable Adunavoidable ad

adiological Adverse Impact - Potential doses to members of the public from releases to air and surface water. Mitigation Measure - All releases would be well below regulatory limits. No mitigation required.Unavoidable Adverse Environmental Impacts - Small unavoidable adverse impacts.

Adverse Impact - Potential doses to members of the public from releases to air and surface water. Mitigation Measure - All releases would be well below regulatory limits. No mitigation required.Unavoidable Adverse Environmental Impacts - Small unavoidable adverse impacts.

Adverse Impactpublic from releMitigation Measbelow regulatorUnavoidable Adunavoidable ad

Adverse Impact - Fuel cycle activities would have liquid discharges. Mitigation Measure - No mitigation needed.Unavoidable Adverse Environmental Impacts - Small unavoidable adverse impacts.

Adverse Impact - Fuel cycle activities would have liquid discharges. Mitigation Measure - No mitigation needed.Unavoidable Adverse Environmental Impacts - Small unavoidable adverse impacts.

Adverse Impactliquid dischargeMitigation MeasUnavoidable Adunavoidable ad





10.4-66B

enefit-Cost B

alance

STP 3 & 4

Environmental R

eport

AM

– Potential visible plumes from if used.ure - None required.verse Environmental Impacts - Small verse impacts.

- Emissions from intermittent l generators and other emission ent. ure - Comply with TCEQ permit limits for installing and operating air s.verse Environmental Impacts - Small verse impacts.

- Relatively small quantities of air be result from the fuel cycle.ure - No mitigation needed.verse Environmental Impacts - Small verse impacts.



Rev. 03

tmospheric and eteorological

Adverse Impact – No adverse impacts from dry cooling tower are anticipated.Mitigation Measure - None required.Unavoidable Adverse Environmental Impacts - No unavoidable adverse impacts.

Adverse Impact – Potential visible plumes from cooling towers, if used.Mitigation Measure - None required.Unavoidable Adverse Environmental Impacts - Small unavoidable adverse impacts.

Adverse Impactcooling towers, Mitigation MeasUnavoidable Adunavoidable ad

Adverse Impact - Emissions from intermittent operation diesel generators and other emission emitting equipment. Mitigation Measure - Comply with TCEQ permit limits and regulations for installing and operating air emission sources.Unavoidable Adverse Environmental Impacts - Small unavoidable adverse impacts.

Adverse Impact - Emissions from intermittent operation diesel generators and other emission emitting equipment. Mitigation Measure - Comply with TCEQ permit limits and regulations for installing and operating air emission sources.Unavoidable Adverse Environmental Impacts - Small unavoidable adverse impacts.

Adverse Impactoperation dieseemitting equipmMitigation Measand regulationsemission sourceUnavoidable Adunavoidable ad

Adverse Impact - Relatively small quantities of air pollutants would be result from the fuel cycle.Mitigation Measure - No mitigation needed.Unavoidable Adverse Environmental Impacts - Small unavoidable adverse impacts.

Adverse Impact - Relatively small quantities of air pollutants would be result from the fuel cycle.Mitigation Measure - No mitigation needed.Unavoidable Adverse Environmental Impacts - Small unavoidable adverse impacts.

Adverse Impactpollutants wouldMitigation MeasUnavoidable Adunavoidable ad





Benefit-C

ost Balance

10.4-67/68

STP 3 & 4

Environmental R

eport

EJ

- No disproportionately high or s on minority or low-income ulting from operation of the proposed been identified. ure - No mitigation needed.verse Environmental Impacts - Small verse impacts.



Rev. 03

nvironmental ustice

Adverse Impact - No disproportionately high or adverse impacts on minority or low-income populations resulting from operation of the proposed new units have been identified. Mitigation Measure - No mitigation needed.Unavoidable Adverse Environmental Impacts - Small unavoidable adverse impacts.

Adverse Impact - No disproportionately high or adverse impacts on minority or low-income populations resulting from operation of the proposed new units have been identified. Mitigation Measure - No mitigation needed.Unavoidable Adverse Environmental Impacts - Small unavoidable adverse impacts.

Adverse Impactadverse impactpopulations resnew units have Mitigation MeasUnavoidable Adunavoidable ad





Rev. 03 STP 3 & 4 Environmental Report · 2012-12-02 · Benefit-Cost Balance 10.4-3 STP 3 & 4...

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Transcript of Rev. 03 STP 3 & 4 Environmental Report · 2012-12-02 · Benefit-Cost Balance 10.4-3 STP 3 & 4...