Comprehensive Plan for the City of Plant City Florida ......Hydraulic Level-of-Service (LOS) -...

Comprehensive Plan for the City of Plant City Florida

Public Facilities As amended by the City of Plant City City Commission April 13, 2009 (Ordinance 11-2009) Department of Community Affairs Notice of Intent to Find Comprehensive Plan Amendments in Compliance published June 16, 2009 [DCA Docket No. 09-IER-NOI-2902-(A)-(I)] Effective Date: July 7, 2009

Comprehensive Plan for the City of Plant City, Public Facilities

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Comprehensive Plan Amendment Number and Description

Ordinance Number, Adoption Date & Effective Date

PC/CPA 09-24 - Removes references to concurrency requirements/impact fees for transportation facilities within the City of Plant City. In lieu of this, recognizes the recently adopted transportation mobility plan and fees of Plant City.

Ordinance 30-2010, October 11, 2010 Effective Date: December 14, 2010

PC/CPA 11-07 – A text amendment to streamline and improve the understanding of the PFE.

Ordinance 28-2012, September 10, 2012 Effective Date: October 18, 2012

PC/CPA 12-01 – A text amendment to incorporate the findings of the updated 10 Year Water Facilities Work Plan.

Ordinance 01-2013, January 14, 2013 Effective Date: March 1, 2013

Comprehensive Plan for the City of Plant City, Public Facilities Page 3

City of Plant City Public Facilities TABLE OF CONTENTS PAGE I. INTRODUCTION ............................................................................................ 5 II. SANITARY SEWER SUB-ELEMENT .................................................................... 6 III. SOLID WASTE SUB-ELEMENT ....................................................................... 16 IV. STORMWATER SUB-ELEMENT ....................................................................... 23 V. POTABLE WATER SUB-ELEMENT ................................................................... 32 VI. GOALS, OBJECTIVES AND POLICIES* ............................................................. 39 VII. CONCURRENCY, IMPLEMENTATION AND MONITORING SYSTEM* .......................... 51 VIII. BACKGROUND ON OTHER SUPPORT DEPARTMENTS .......................................... 54 (*) DENOTES ADOPTED TEXT TABLE OF TABLES PAGE TABLE 1. WASTEWATER FLOW PROJECTIONS ........................................... 11 TABLE 2. WASTEWATER FLOW PROJECTIONS, DETAILED......................... 12 TABLE 3. 2005-2025 RESIDENTIAL SOLID WASTE (TONS). ......................... 18 TABLE 4. 2005-2025 COMMERCIAL/INDUSTRIAL SOLID WASTE (TONS) .... 18 TABLE 5. RIVER BASIN SYSTEMS ............................................................... 26 TABLE 6. WATER PRODUCTION FACILITIES ............................................... 33 TABLE 7. WATER STORAGE FACILITIES ..................................................... 33 TABLE 8. WATER SERVICE PROJECTION ................................................... 36 TABLE 9. ESTIMATED FUTURE SERVICE DEMAND .................................... 36 TABLE 10. FUTURE FIRE FLOW REQUIREMENT ......................................... 37 TABLE 11. WATER FACILITIES WORK PLAN ................................................. 48 TABLE OF FIGURES PAGE FIGURE 1. EXISTING SANITARY SEWER SYSTEM ....................................... 58 FIGURE 2. PROPOSED SANITARY SEWER SYSTEM..................................... 59 FIGURE 3. EXISTING STORMWATER MANAGEMENT SYSTEM. ................... 60 FIGURE 4. EXISTING POTABLE WATER FACILITIES. ................................... 61 FIGURE 5. PROPOSED POTABLE WATER FACILITIES. ................................ 62 FIGURE 6. EXISTING RECLAIMED WATER LINES………………………………...63


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I. INTRODUCTION Plant City is a rapidly growing city in eastern Hillsborough County covering approximately 28 square miles with a projected 2025 population expected to exceed 49,000 people within the existing City limits. The anticipated distribution of land use and population provides direction for the capital expenses in providing the infrastructure for Plant City. This Element has been prepared to meet the requirement of the Local Government Comprehensive Planning and Land Development Regulation Act, Chapter 163, Florida Statutes (FS). In relevant part, the Act requires Comprehensive Plans to describe: 1) sanitary sewer, solid waste, stormwater and potable water problems and needs; 2) ways to provide for future requirements; and, 3) general facilities that will be required for solution of the problems and needs. This element covers a planning period of twenty years overall, beginning with the year 2005 and projecting future conditions to the year 2025. Facility needs and implementation plans have been evaluated based on the most current demographic and land use data and projections, using the same methodologies as in the original construct of the above master facility plan. This Element is divided into sections containing: 1) the support documents, which are the technical reports summarizing the data and analyses on which the Element is based; and 2) the Goals, Objectives and Policies for the Element, to be adopted in the Comprehensive Plan for the City. The support documents are presented as sub-elements for the different types of facilities dealt with in the Element. Each sub-element includes: 1) a survey of existing conditions; and; 2) an assessment of existing and future needs and recommendations for meeting those needs. The Public Facilities Element contains the sanitary sewer, solid waste, stormwater and potable water sub-elements.


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II. SANITARY SEWER SUB-ELEMENT EXISTING CONDITIONS Area of Service Sanitary sewer service by Plant City is supplied within the incorporated city limits, which comprises approximately 28 square miles. Minimal areas outside the City limits are also provided with sanitary sewer service. The mechanism by which Plant City extends its infrastructure services to accommodate development is through annexation. In this way, services are concurrent with application of municipal regulations and funding requirements, so as to provide uniform and equitable municipal costs and benefits. The City recognizes the need to develop public and private partnerships to support sustainable growth. The City has initiated these partnerships in the form of developers agreements allowing for infrastructure to be constructed at developer’s cost, but allowing for reimbursement under certain conditions. Historic population figures and projections, prepared by the Hillsborough County City County Planning Commission, are provided and are consistent with the Future Land Use Element. Approximately 35% of the total City acreage does not have sanitary sewer service. This also includes newly annexed properties intended for future development. Reuse or reclaimed water is generated by the City to reduce the impacts from water withdrawls and provide beneficial reuse of wastewater. The City is in the process of expanding the reclaimed water system to service the eastern portion of the City and is working with potential large quantity users to increase their current reclaimed water use. The City requires reclaimed water be used for all new development projects requiring irrigation, if reclaim is available. Existing Sewer System Description The City’s sanitary sewer system includes approximately 91 miles of gravity sewer with 3,100 manholes, 24 miles of forcemain, and 38 lift stations. The system includes facilities that were constructed between 1913 to present day. Approximately 75% of the system is constructed of VCP (clay) pipe. In-house crews have an annual minimum goal of replacing 1 mile of gravity sewer per year. (Please see Figures 1 and 2, Existing Sanitary Sewer System and Proposed Sanitary Sewer System.) The City’s TV camera crews help identify priority areas subject to inflow and infiltration or collapse. The City currently has a 20” forcemain project under construction to provide service to new development east of the current service limits. This project is scheduled for completion in 2008 and will increase collection system capacity by over 1.5 million gallons per day.


Developer initiated improvements to be completed in 2008 include the construction of two new master lift stations, one located at the Henderson Way industrial area and one located at the proposed County Line Farms industrial area. These lift stations will service the easternmost part of the City and the proposed Lakeside Station industrial area. The City will take responsibility for operation and maintenance of the lift stations when the developer completes the project. A major expansion and upgrade to the City’s water reclamation facility is currently under construction. The majority of process components constructed prior to 1975 are being replaced with more modern facilities to improve efficiency and reliability. The design treatment capacity will increase from 8 million gallons per day to 10 million gallons per day. The Plant City sanitary sewer system has ongoing improvements that will provide additional capacity and conveyance to meet the needs of the changing economy. The ongoing improvements being performed by the City and those initiated by developers represent the City’s commitment to support continued growth within the City. The City has extended a 24” trunk line along SR 39 to CF Industries for reclaimed water and a 24” line along Cherry Street to serve City parks and for future reclaimed water distribution. Regulatory Framework Federal - The Federal Water Pollution Control Act (PL 92-500) is the controlling national legislation relating to the provision of sanitary sewer service. The goal of this act is the restoration and/or maintenance of the chemical, physical and biological integrity of the nation’s waters. The act established the national policy of implementing area wide waste treatment and management programs to ensure adequate control of sources of pollutants. The U.S. Environmental Protection Agency is responsible for implementing the Act. State - The Florida Department of Environmental Protection (FDEP) is responsible for ensuring that the State carries out responsibilities assigned to it under PL 92-500. FDEP has adopted rules for the regulation of wastewater and reclaimed water facilities in the Florida Administrative Code. These rules apply to facilities which treat flows exceeding 5,000 gallons per day for domestic establishments, 3,000 gallons per day for food service establishments, and where the sewage contains industrial or toxic or


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hazardous chemical wastes. Treated biosolids and effluent are regulated by the Florida Department of Environmental Protection for the treatment, reuse and disposal. The Florida Department of Health (DOH) regulates septic tank and drain field installation within the State. These requirements have been adopted by rule in Chapter 10D-6, F.A.C. Local - Plant City has ordinances that require mandatory connection to the City sewer system when gravity sewer service is within 200 feet of connection. The City also requires that all non-residential development connect to the City sanitary sewer system prior to issuance of a certificate of occupancy. The City calculates sanitary sewer flows based upon an equivalent residential connection (ERC). The equivalent residential connection is 350 gpd or 20 fixture units, whichever is greater. Non-residential development discharging to the City system is calculated using flows based upon State Rule 64E for calculation of sanitary flows. The Engineering Division is responsible for determining concurrency for sanitary sewer. The City also has an industrial pretreatment program for industrial discharges to the collection system. Wastewater concurrency is accomplished annually by comparing wastewater flows to permitted treatment capacity to determine the available capacity. This assessment allows development to occur if available capacity exists to service proposed development. Wastewater Treatment Facilities The upgraded wastewater treatment facility replaced the old biological treatment system completely, including new aeration and anoxic basins, final clarifiers, RAS/WAS pump station, and on-line instrumentation and controls to dramatically improve the treatment reliability and efficiency. The project also involved expansion of existing reclaimed water production facilities including filter addition, expanded chlorine contact basins, new ground storage tank, additional high service pumping capacity. Other improvements included a new administration building and belt press modifications. This new system provides for improved treatment through the use of high efficiency aeration systems and through the extensive use of instrumentation and control systems throughout the facility. This new treatment train is intended to reduce energy use per unit of wastewater treated and to improve the quality of final effluent discharged to surface waters. The old biological treatment system utilized hyacinth ponds for nutrient polishing and surge attenuation. This type of system was subject to excessive seasonal variations and provided inconsistent treatment. Hydraulic Level-of-Service (LOS) - Sewage Flows The level-of-service for sanitary sewer flows is the equivalent residential connection (ERC). The ERC is set at 350 gpd or 20 fixture units. Non-residential concurrency for sanitary sewer capacity is calculated based upon


how many ERC’s are generated using State Rule 64E or fixture units, whichever is greater. Concurrency for conveyance is determined by calculating the quantity of ERC’s and then assigning a peaking factor. Residential connections are considered to be one ERC or 350 gpd. Adjustments to the ERC are calculated for multi-family dwelling units where wastewater flow per unit is expected below the ERC. In 2007, the wastewater treatment plant experienced an annual average flow of 5.266 mgd with a peak flow of 6.476 mgd. Currently, the plant is permitted for 8.0 mgd and upon completion of the treatment plant upgrades will have a capacity of 10 mgd (2008). Existing available capacity is determined using annual average flow and deducting the quantity of ERC’s required for development. Using a population estimate of 33,000 and the annual average flow, the per capita demand is 160 gallons per capita. However, such an assessment is inconsistent with the City’s 350 gpd ERC and flows estimated using Rule 64E. The inconsistency has developed because of the significant flows that are received from industrial users. Therefore, the City deducts the significant industrial flow component and estimated Inflow and Infiltration (I&I) to develop a per capita value more consistent with regional per capita flows. The City will utilize a per capita flow based upon the ERC of 350 gpd and a per household population of 2.8 persons. This results in a residential per capita flow of 125 gallons per capita, exclusive of flow from Significant Industrial Users and I &I. Significant Industrial Users are defined for this purpose as those customers generating an annual average wastewater flow of 25,000 gallons per day or more. Adopted Level-of-Service The adopted level-of-service in the City's comprehensive plan for its wastewater system is 350 gpd per equivalent residential connection. This equates to 125 gallons per day per capita exclusive of Inflow ‐ Infiltration and Significant Industrial Users. For the purpose of the Sanitary Sewer LOS, Significant Industrial Users (SIUs) are industrial customers that are permitted to discharge 25,000 gallons per day or more to the City’s Sanitary Sewer System. SIUs contribute a significant portion of the flow in Plant City’s system, and their discharge volumes are not related to the population of the City, therefore it is not reasonable to account for their flows under the overall Level of Service Standard. The number of SIUs


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in the City has varied from a high of eight to a low of six over the last five years. During this period, the average annual flow per SIU has also varied from a high of 173,000 gallons per day to a low of 133,000 gallons per day. For the purpose of establishing a SIU LOS, a value of 200,000 gallons per day per SIU is appropriate. No level-of-service has been adopted for reclaimed water. NEEDS ASSESSMENT A complete analysis of existing residential, multi-family, industrial and commercial flow needs to be performed to develop a more accurate per capita assessment and determine available capacity in the conveyance system. Capacity Assessment - General The City’s sanitary sewer collection system continues to operate satisfactorily, with few to no performance related sewer overflows or spills. Routine inspection, cleaning, and replacement of damaged or failing components will continue to be necessary for the foreseeable future. The Water Reclamation Facility continues to operate under a Consent Order with the Florida Department of Environmental Protection. Operational or treatment deficiencies are being addressed largely through the current construction project; however, other improvements have been implemented through the Industrial Pretreatment program and other operational controls. Sanitary sewer water demand projections indicate that the 10 million gallon per day capacity should serve the City’s needs through 2020. The City is also actively expanding the reclaimed water transmission and distribution system capacity in order to meet future needs. A 24” reclaimed water main is currently under construction to serve existing and future customers located in the north and east portions of the City. This main will have a capacity of over 2.5 million gallons per day. An additional 18” diameter reclaimed water main is planned to serve the southwest portion of the City. This project is partially funded through current Capital Improvement Project funds and the City is pursuing other funds to complete financing of the project. In the projection of demand, assumptions must be made concerning the nature of the future development scenario. These assumptions are keyed to growth management concepts as presented in the Land Use Element. The governing entity, in this case the municipal government of Plant City, has the responsibility of managing the growth of its community, and can therefore either validate or invalidate these assumptions through their developmental policies. The higher the degree of conformance to the growth management strategies which are stated or implicit in this study, the more accurate these projections will be. It is assumed that growth in the study area will be relatively uniform and continuous and follow the guidelines and patterns given in the Future Land


Use Element. It is assumed that sewer service will be provided to annexed areas at the time of development, with such provision being for compact areas which are contiguous with the existing City limits. Finally, it is assumed that new sewage flows will be qualitatively similar to existing flows within the same user category, with the total plant loading reflecting relative categorical changes within the user population matrix. Departure from this scenario for single or multiple users with flows which vary greatly in quantity or quality from the current user profile will generate system impacts that cannot be determined except on a case by case basis. Hydraulic Capacity The bases for estimating future sewage production are the categorical Level-of-Service parameters for flow developed in the previous section. When these are combined with the residential population projections provided by the Hillsborough County City-County Planning Commission, we can forecast levels of demand for the system. Current and Future Projections The City is currently experiencing significant growth in industrial development. Areas previously considered as residential in the future land use are being converted to industrial use. The eastern section of the City has experienced considerable demand for industrial development. Industrial development typically creates less demand for sewer services. The City expects the eastern edge of the City along County Line Road to develop as an industrial hub. The City recently completed the Northeast Plant City Area Master Plan which examined the area north of I-4 and east of SR 39. The master plan which the City has adopted as a vision plan for the area is a multi-use vision with a variety of residential and commercial components. Service to this area will require upgrades to the collection system to support growth. The City has recently completed an engineering study to estimate future growth and subsequent utility demands through the year 2025. (Jones Edmunds Report, May 2008) The study included growth of the City limits by approximately 31 square miles. Population projections were developed utilizing Hillsborough County Metropolitan Planning Organization Traffic Analysis Zones (TAZ) populations. The population and wastewater flow projections developed by the study are provided in Table 1. TABLE 1. WASTEWATER FLOW PROJECTIONS

Year City Population

Residential Flow (MGD)

Commercial and Industrial

Flow (MGD)

Total Service Area Wastewater

Flow (MGD) 2015 40,207 3.26 4.20 7.46 2025 51,769 4.47 5.64 10.11

Source: Plant City Public Works Department, 2008


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Table 2 provides interpolation of the study data, and further adjustment for an estimated annual inflow and infiltration values of 0.5 MGD. TABLE 2. WASTEWATER FLOW PROJECTIONS, DETAILED

Year Annual Average Influent Flow

(MGD)

Infiltration and Inflow (MGD)

Total Wastewater Flow (MGD)

System Capacity

(MGD) 2010 6.60 0.50 7.10 10.0 2015 7.46 0.50 7.96 10.0 2020 8.78 0.50 9.28 10.0 2025 10.1 0.50 10.61 10.0

Source: Plant City Public Works Department, 2008 Wastewater Treatment Plant Hydraulic Capacity The Plant City Treatment Facility will be adequate for the hydraulic capacity projected until the end of the planning period. The upgraded and expanded system has been designed and constructed to facilitate further expansion to 12 MGD. Hydraulic design has been completed to assure adequate treatment and reliability for the design peak hour flow conditions. Collection System Hydraulic Capacity Previous studies have demonstrated that the City’s collection system is sufficient to accommodate flows through the 2015 timeframe. The City recently provided approximately 2.5 MGD of additional wastewater conveyance capacity through construction of a new 20” wastewater forcemain. This new forcemain serves anticipated high growth areas to the east and northeast of the City. Further, the City plans to continue development of the Utility Master Planning effort through detailed modeling of the sanitary sewer gravity and forcemain systems. System Expansion Existing capacity will be adequate throughout the planning period. However, if unanticipated growth materializes, additional developer agreements may need to be pursued to require interceptor upgrading installations. Sewer trunk main and pump stations will be required to expand service into areas of future development. System Performance Assessment The primary source of information for this section is the office of the City Engineer. The performance of the Public Works staff in terms of system operations and maintenance is good and will not require further discussion. The main thrust of this section will be on specific structural inadequacies whose remedies will enhance the ability to analyze system performance and project future requirements. Likewise, there are nonstructural or organizational areas which have evolved over time which need to be reviewed to determine how best to serve their intended purpose. The City shall evaluate


new technology and possibly the use of remote treatment systems for service to remote areas of the City. The collection system of Plant City shows evidence of infiltration and inflow (I&I) in various areas of the City. In response, the City has an active grouting and televising crew dedicated to the location and repair of I&I. Also, development within the City is encouraged to utilize forcemains which reduce the I&I component into the system. Gravity collection systems are required to be designed to new standards that require better construction of manholes and the use of manhole gaskets at the point of connection to eliminate the potential for I&I. The implementation of new design standards is working, but needs to be finalized and updated with current technological advances. Replacement of existing service lines that are at or near their service life needs to be a priority. In 2007, the City crews replaced 5,173 feet of sanitary sewer lines and grouted another 14,683 feet of line. While grouting provides an immediate repair only, replacement will provide long term sustainable I&I control. The City will evaluate expanding its line replacement program to further reduce I&I issues. Lift stations: The City has 38 lift stations currently under maintenance. Many are old and in need of upgrades or replacement. The City has a good record of maintenance of its lift stations, but system efficiencies need to be evaluated to support growth. The City should examine the collection system in combination with its lift stations to determine available capacities. During the review process of new development, staff will implement a mechanism to quickly evaluate potential points of connection to determine available capacity. However, before this can be done, a system wide analysis of the capacity will need to be performed to develop a model which can then be utilized for review. The City has an industrial pretreatment program which evaluates discharges to the collection system. The pretreatment program identifies those industrial users who, based on their standard industrial classification code (SIC) or discharge quality, may impact the treatment system. While this system has worked in the past due to a limited quantity of industrial users in the City, future industrial development will require a more comprehensive assessment of the total flows, both industrial in nature and sanitary, and the combined impacts to the system. The City will evaluate combining or more fully integrating its pretreatment program within the scope of the overall development review process. This will provide a more detailed analysis of combined flows and impacts to the system. Septic systems represent a significant source for ground water pollution within the State. The City will evaluate areas serviced by septic systems for future CIP projects. The City will also try to develop partnering opportunities with other agencies such as the Florida Department of Environmental Protection to provide financial assistance to current septic system owners for payment of


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connection and development fees incurred for connection to City sanitary service. Administrative procedures will be developed which encourage development to utilize the best available technology in their system design. This can be accomplished by reimbursement agreements, or in kind system improvements. The City will develop regulations designating wellhead protection areas and prohibit onsite sewage treatment and disposal systems in those areas. SUMMARY AND RECOMMENDATIONS Overview The Plant City Sewer System is generally in good condition and serves the City’s population well. Changing conditions in the waste profile of the service population and the regulatory climate necessitate upgrading of the treatment facility. Continued growth along the perimeter of the City will require expansion of the collection system. In addition to structural improvements to the system, other aspects of system policy, monitoring and baseline data acquisition require improvement to allow for better operation and planning. The following recommendations will serve as a guide for these improvements. 1. Data acquisition, evaluation and possible action in dealing with suspected

I&I need to be undertaken in selected areas. 2. All existing and future users need to be surveyed and/or monitored to

determine quality and quantity of wastes discharged, with particular emphasis on industrial sources and other wastes which have high impact on treatment plant capacity and operation.

3. The user charge and pretreatment programs need to be periodically

reviewed with respect to the information developed in the user survey. 4. Design standards for reclaimed water and master planning for reclaimed

water distribution need to be included in the City’s planning horizon. 5. The City needs to evaluate user fees for reclaimed water use to recover

operating and capital costs. 6. The economic viability of the Sewer Utility depends on recovery of operating

and capital expenditures in an equitable fashion from both present and future users. To accomplish this, adequate data on the relationship between sewage generation and the total costs for collection and treatment must be developed. This relationship includes not only the volume of wastes, but also both operating and capital treatment cost impacts of the


various pollutants within those wastes. Baseline data on system structural inventory and operational costs needs to be developed and periodically updated.

7. Data upon which the projections within this report were made are in some

cases estimated. As direct measurement of key parameters are obtained, adjustments to these projections should follow.

Capital Expenditures Program The structural improvements and projected expansion of the Plant City Sewage System will be translated into a capital expenditures program in the annual review and included in the Capital Improvement Program as funds are available.


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III. SOLID WASTE SUB-ELEMENT INTRODUCTION The Solid Waste Sub-element has been prepared to meet the requirements of Chapter 163, F.S. The Sub-element addresses Plant City’s existing and future solid waste collection needs through the year 2025. The collected solid waste is currently being transported to the Paragon Development Group, LLC Plant City Solid Waste Transfer Station and then transferred to the City of St. Cloud landfill located in Osceola County. Currently, there is no disposal of the City’s solid waste within the jurisdiction of Hillsborough County. The City of Plant City through Chapter 40 of the Plant City Code of Ordinances provides for the operation of a solid waste collection system service within the municipal boundaries. Pursuant to a Special Act by the Florida Legislature, Chapter 83-415, Law of Florida (The Hillsborough County Resource Recovery Act of 1983), areas of unincorporated Hillsborough County annexed by the Cities of Plant City, Tampa, and Temple Terrace after June 1983 remain within the solid waste service area of the County. Those areas annexed by Plant City after 1983 are provided for in the Hillsborough County Solid Waste Element. CONTEXT FOR SERVICE PROVISION Virtually all Federal and State regulations relating to solid and hazardous waste address disposal facilities. Plant City is responsible for the collection of disposable material and for the transport to an acceptable disposal facility. For hazardous wastes, the National Resource Conservation and Recovery Act (RCRA) of 1976 directed EPA to develop a national program to regulate and manage hazardous waste and provide incentives for states to adopt consistent programs. The Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA), passed by Congress in 1980 provided EPA with authority and funds to respond to incidents requiring site clean-up and emergency mitigation (the “Superfund” program). This act also defined the liability of business engaged in hazardous waste generation, transport and disposal, and provided enforcement processes. The Florida Resource Recovery and Management Act (Sec. 403.7, FS), passed in 1980, adopted the federal guidelines and directed FDEP to develop a hazardous waste management program. Amendments to the Act in 1983, provided direction and funds to establish a cooperative hazardous waste


management program between local, regional and State levels of government. The City of Plant City cooperates with Hillsborough County in these programs. PLANT CITY SOLID WASTE COLLECTION FACILITIES The City currently meets its LOS of being able to provide solid waste disposal of 5 lbs/day/capita for residential service and 400 lbs. per pick-up for commercial service. The permitted allowable tonnage at the Plant City Waste Transfer Station is 528 tons per day. In 2005, the City expects to transport 147 tons of solid waste daily. In 2025, the City projects that it will generate a total of 218 tons of solid waste per day. Overall, the Plant City Waste Transfer Station will still maintain a surplus capacity of 310 tons per day. The City operates a comprehensive solid waste collection program which is designed to provide residents and businesses with regular and special solid waste collection service. The City still maintains the same number of residential routes and remains responsible for the collection of solid waste. Existing Conditions Residential Collection - Single and multi-family residential garbage and trash pickups continue to be twice per week at curbside and are then transported to the Plant City Transfer Station. Single family residential collection is accomplished with crews and rear loaders. Spare loaders are available for backup if a route truck is unavailable due to repairs or maintenance. Multi-family, which relies upon large containers, is serviced by commercial collection front-end loader method. Commercial Collection - Due to the volume of solid waste multi-family and commercial establishments generate, they require the use of containers which in turn require mechanical lifting. The City currently provides service to users whose dumpsters range in cubic yardage size. The rate charged is determined by those who are serviced by municipal automatic loader containers and those not serviced by municipal automatic loader containers. Rate structures include the cost of the dumpster and the cost of providing collection and disposal. Commercial collection service is provided 6 days a week and it involves the use of a crew and a front-end loader. A backup loader is available for use when needed. Special Pickup - Garbage in prescribed containers and trash in containers or properly bundled are picked up during a regular designated once-weekly pickup. Refuse that does not meet these precollection requirements has to be removed by the owner or the owner must request that the City provide a special pickup. An extra charge is applied for this service. This service generates refuse and is incorporated into the total tonnage outlined. All solid waste is transported to the Plant City Waste Transfer Station.


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Spring Cleanup - The City of Plant City annually picks up hazardous materials at its hazardous waste collection center. Newspaper and Oil Recycling - In 1989, the newspaper recycling program was municipally operated, with the City providing disposal containers on City property. The City continues to operate a newspaper recycling program. The oil recycling program which was also municipally operated, is now operated by the City Garage. Permitted Haulers - Some establishments generate volumes that economically justify the use of large servicing on a limited basis. This service is only provided to commercial and industrial establishments within the City. Due to its limited use, it is not presently cost effective for the City to purchase the specialized equipment needed to provide service. The locations with this type of service requirements are served by permitted private haulers who contract directly with the individual users. Table 3 and Table 4 summarize the current and projected future demands placed on the Plant City solid waste collection system. TABLE 3. 2005-2025 RESIDENTIAL SOLID WASTE (TONS)

Year

Population

LOS Standard

(1)

Residential Demand

Com./Ind. Demand

Capacity

(2)

LOS Surplus/

Deficiency (3) 2005 33,000 83 74 73 455 381 2025 49,040 123 110 108 420 310

1. (5 lbs/Capita/Day x Population)/2000 2. Permitted Capacity (528 Tons/Day) – (Commercial/Industrial Tonnage) 3. Capacity – LOS Standard Source: City of Plant City Public Works Department, December 2008

TABLE 4. 2005-2025 COMMERCIAL/INDUSTRIAL SOLID WASTE (TONS)

Year

Com./Ind. Pick-

Ups/Day

LOS Standard

(1)

Residential Demand

Com./Ind. Demand

Capacity (2)

LOS Surplus/

Deficiency(3) 2005 390 78 74 73 454 381 2025 549 110 110 108 418 310

1. (400 lbs/per Pick-Up x Pickups/Day)/2000 2. Permitted Capacity (528 Tons/Day) – (Residential Tonnage) 3. Capacity – LOS Standard Source: City of Plant City Public Works Department, December 2008

Levels of Service Levels of service (LOS) can be set on the basis of volume of solid waste per capita per day or for commercial (including multi-family) on the basis of number of pickups per route per day. The first approximation of the current LOS for collection would be pounds per capita per day (total pounds/total population serviced/365). Design standards generally rely on a standard of 5 to 8 pounds per capita per day. It has been determined that Plant City


generates 5.55 pounds per capita of total solid waste daily. Of this total 2.56 pounds per capita are picked up from residential households and 390.2 pounds per pickup from non-residential customers. The current inventory of vehicles for residential and commercial service is adequately servicing the current population. As the population grows, additional vehicles will be purchased. Adopted Levels of Service Current adopted levels of service for the City's solid waste facilities allow for 5.0 pounds of solid waste per day per capita for residential customers and 400 pounds per pickup for non-residential customers. Recycling Program With the advent of the State recycling legislation (CS/CS SB 1192), Plant City coordinates with the private sector to reduce the amount of solid waste collected by the City. Currently various civic groups, church groups, and local businesses operate recycling programs for newspaper, corrugated paper, aluminum, and motor oil. The City continues to promote these activities in an effort to make the public aware of these programs and encourage reduction of solid waste on a voluntary basis. Hazardous Materials and Waste The Objectives and Policies regarding Hazardous Materials and Waste cover two specific issue areas: public education and contaminated sites. This requires coordination among federal, state and local regulatory agencies and the City and its residents to manage hazardous materials and dispose of hazardous waste properly. The main focus is to provide the public with proper information such that informed decisions are made in the handling of various types of hazardous materials. Additionally, proper disposal must be addressed while a comprehensive network of facilities to manage hazardous materials and wastes is developed. The lead agency in coordinating public education relative to hazardous materials is the Environmental Protection Commission of Hillsborough County (EPC). In cooperation with the Florida Department of Environmental Protection (FDEP), sufficient public information materials will continue to be produced. A joint effort is needed to provide the public with the current disposal information, including emergency programs. Hillsborough County, through EPC, the Planning Commission and the Metropolitan Planning Organization, will assist the City in distributing information to city residents.

Existing contaminated sites are also an area of concern. Federal and state agencies, the U. S. Environmental Protection Agency (EPA) and FDEP, are responsible for site clean-up. The City may provide site cleanup prioritization criteria and encourage re-use of areas once restored. It will be a joint effort of


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the various federal, state, and local regulatory agencies to provide guidance to ensure that public safety is not jeopardized in dealing with hazardous materials and wastes. In 1983, the Florida Legislature passed the Water Quality Assurance Act (Section 403.7225, Florida Statutes, and Chapter 83-310, Laws of Florida) which required each county to conduct a County Government Hazardous Waste Management Assessment. These Assessments were to include: A list of hazardous waste

generators; Results of the generator survey

(generators, waste types and quantities, and waste management practices);

Identification of abandoned dump sites;

Hazardous waste operating procedures at sanitary landfills;

Type(s) of facilities needed to serve the County’s generators; and

Designation of a transfer/temporary storage facility area(s). In 1984, Hillsborough County completed the required assessment, satisfying the statutory requirements and providing the County with sufficient information to develop tools necessary to properly control the storage, transfer, recovery and/or disposal of hazardous wastes. This assessment is inclusive of Plant City, and hazardous waste management on a City level is assumed as a part of this county-wide program. Any municipal or county governing bodies responsible for policing efforts will work in coordination with state regulators. Based on the results of the county-wide survey, approximately 13.2 million pounds (lbs.) of hazardous wastes are known to be produced annually in Hillsborough County. All types of waste can be found in the County, ranging from approximately 6.8 million lbs. of waste oil, greases, and lubricants to 1,642 lbs. of waste wood preservatives. Presently, 58.1% of the waste is being recycled, reused, or treated. The type of hazardous waste with the largest production is waste oils, greases, and lubricants which accounts for 51.4% of the waste produced annually in Hillsborough County. A large percentage of this waste is related to vehicular maintenance and repair. Another large amount of waste produced annually in Hillsborough County is spent solvents. This waste type accounts for


approximately 1.3 million lbs., or 10.2% of the total amount of hazardous waste. To provide a more complete review of hazardous waste produced in Plant City and Hillsborough County, the quantities of hazardous waste recorded in the county-wide survey were projected as if a 100% response to the survey had been obtained. Based on this assumption, the quantity of waste produced annually in Hillsborough County was estimated to be approximately 26.2 million lbs; 63.6% of the waste is estimated to be recycled, reused, or treated. As expected, waste oils, greases, and lubricants; waste paints with flammable solvents; spent solvents; and wastewater treatment sludges containing heavy metals remained the waste types with the largest quantities produced annually. These wastes account for 83.7% of the total hazardous waste anticipated to be produced in Hillsborough County. Based on survey results, the most often used storage methods for hazardous waste in Hillsborough County include: above ground tanks, 55 gallon drums, 40 gallon drums, and various size cans and pails. Cans and pails of various size are the most used method which is indicative of the small quantity generator that periodically produces a limited amount of waste (less that 2,200 lbs. per month) over an extended time period, such as 6 to 12 months. Practices often employed to dispose of hazardous waste in Hillsborough County include recycling the waste, disposal in a landfill, and pouring the waste into the sewer system. According to survey results, the most often employed disposal practices for hazardous waste is recycling and placement in existing landfills. The recycling effort for waste is an encouraging practice and is indicative of the markets that are available for such activities. These disposal practices also provide an incentive for landfill operators to improve solid waste control procedures to reduce liabilities associated with groundwater and surface water contamination resulting from the disposal of hazardous waste. Of the millions of pounds of hazardous waste estimated to be produced annually in Hillsborough County, it is estimated that 64% of the wastes are currently being disposed of in an acceptable manner, including recycling, treatment, or reusing practices. This indicates 36% or approximately 9.5 million lbs., would be available to provide a county-wide market for a transfer/temporary storage facility. Due to the availability of reuse or recycle markets for waste oil, spent solvents, photographic wastes, and lead acid batteries, the amount of waste available for the transfer/temporary storage facility could be reduced an additional 2.1 to 4.9 million lbs. This results in 4.6 to 7.4 million lbs. of the waste available for handling at a transfer/temporary storage facility.


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Abandoned dump sites can be described as disposal sites that are improperly constructed without precautions for health or environmental protection such as odor, gas and vector controls; water quality protection measures; cover materials; and erosion controls. The purpose of identifying abandoned dump sites is to determine whether action is necessary to correct existing or potential environmental problems or whether additional information is required to make a decision concerning the potential hazard of the site. Determination of potential environmental problems associated with the dump sites was based on a three-level classification: indeterminate, minimal, and substantial. Concerns for ground and surface waters, in conjunction with the type of dump site and level of development on or near the site, provided a basis for the classification. There are 20 solid waste management facilities in Hillsborough County. These facilities include sanitary landfills (Classes I and III), transfer stations, incinerators, refuse-to-energy plants (proposed), a sludge disposal facility, and a composting plant. Two active landfills are presently operating in Hillsborough County: Hillsborough Heights (Class I) and Kingsway Road Landfill (Class III). The two landfills have valid operating permits from FDEP, and groundwater monitoring plans which have been approved and implemented for each landfill.


IV. STORMWATER SUB-ELEMENT

EXISTING CONDITIONS Area of Service Drainage systems are provided by Plant City within the incorporated City limits, which comprise some 28 square miles. (Please see Figure 3, Existing Stormwater Management System.) The mechanism by which Plant City extends its infrastructure services to accommodate development is through annexation. In this way, services are concurrent with application of municipal regulations and funding requirements so as to provide uniform and equitable municipal costs and benefits. Guiding Document The guiding documents for stormwater infrastructure are the Eastside Canal Master Plan (2001), the Westside Canal Master Plan and the engineering standards manual (currently in development). The Eastside Canal Master Plan identified projects to reduce flooding in the Laura Street area. The plan listed six projects to be constructed in sequence which would eliminate roadway overtopping in the 25-year 24-hour storm event, however minor flooding would still occur for the 100-year 24-hour event. The City has completed project one of the master plan and construction of project two is underway. The Westside Canal Master Plan listed various improvements along the Westside Canal and the Ball Street Area. The Westside Canal Master Plan projects have been completed. Regulatory Framework Federal - Section 208 of the Federal Water Pollution Control Act (PL 92-500, 1972) is the directing federal law with respect to water pollution abatement. In implementing the Act, the Environmental Protection Agency (EPA) identified pollutants carried in stormwater runoff as a major source of water contamination. To achieve the pollution abatement goals of the Act, EPA provided assistance to state and local governments to develop areawide Water Quality Management Plans, or 208 Plans, as they are commonly known. These 208 Plans studied a broad range of potential water pollution sources, including stormwater, and focused on identifying pollutant sources and abatement needs as well as development of regulatory programs to ensure implementation. Additionally, in Plant City data concerning stormwater runoff and water quality was developed as a result of the 201 Facility Plan, which was another


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requirement of PL 92-500. Plant City continues to enforce and meet federal National Pollution Discharge Elimination System (NPDES) permit requirements for stormwater runoff and retention for all ongoing and planned development and construction within the City limits. State - In 1985, the Florida Legislature passed the Local Government Comprehensive Planning and Land Development Regulation Act (LGCPLDRA), Chapter 163, Florida Statutes (FS). The LGCPLDRA strengthens the role of local governments in developing and implementing a comprehensive plan to guide future growth and development. Chapter 163 F.S., requires local governments to prepare an Element dealing with the stormwater management system..

Recent planning legislation has strengthened the legal status of local government comprehensive plans. The legislation also provides sanctions for communities that fail to adopt adequate comprehensive plans. The Florida Department of Environmental Protection (FDEP) has adopted a Stormwater Rule (Chapter 62-25, F.A.C.) to fulfill part of the State’s responsibilities under

Section 208 of the Federal Water Pollution Control Act. The Rule’s basic objective is to achieve 80-95 percent removal of stormwater pollutants before discharge to receiving waters. This Rule requires treatment of the first ½ inch of runoff for sites less than 100 acres in size or the runoff from the first 1 inch of rainfall for sites 100 acres or greater in size. Treatment is generally accomplished through retention or through detention with filtration. Retention requires the diversion of the required volume of runoff to an impoundment area with no subsequent direct discharge to surface waters. Pollutant removal by settling and by percolation of the stormwater through the soil is almost total. Detention facilities are typically within the line of flow of the drainage system. Stormwater from a site passes through the detention facility and is filtered prior to discharge to remove pollutants. Implementation of the stormwater rule is achieved through a permitting process. FDEP has delegated permitting responsibility to the Southwest Florida Water Management District (SWFWMD), with jurisdiction over the Plant City area. Plant City addresses the stormwater quality LOS issue for all existing and new development, as indicated above. The City continues to


comply with all applicable NPDES permits and uses the EPA's requirements for the NPDES stormwater discharge permit and the presumptive requirements of the Southwest Florida Water Management District as the minimum water quality standard for stormwater drainage. Local - The Engineering Division is responsible for verifying level-of-service for development within the City. The division is charged with reviewing all plans for development, land alteration, or modifications to existing facilities that may impact the stormwater management system. The Preliminary Engineer’s Report Master Plan for Plant City was adopted in October 1988, which contained a Master Drainage Plan. Standard details and plans for the construction of drainage facilities fall under the jurisdiction of various development ordinances. Topography The terrain of the service area is level to gently sloping, generally descending to the north and west. The elevation in the City varies from a high point of 170 feet to 88 feet (datum 1988). A complete topographic survey of the City and surrounding area was recently completed. The topography will be used to develop accurate flood maps for the City. Soils are rated by the Soil Conservation Services as either A, B, C, D or a combination. The City contains a variety of A soil locations (well drained) to D soils (poorly drained) with the majority of soil types within the City being classified as type D. Throughout the incorporated City and surrounding planning area, there may be found many lowland marshes and small ponds. These features comprise several thousand acres in the planning area, with water alone being 480 acres, or 3.2% of the total. The largest body of water within the City is Lake Walden (formerly Mud Lake). In the extraterritorial planning area, primarily to the southeast and southwest, there are many abandoned phosphate mining pits which have become surface water impoundments. The rainfall varies from 51 inches to 58 inches annually, which provides an average of approximately 0.90 million gallons per day (MGD) of precipitation incident upon the incorporated City, and 1.87 MGD upon the planning area. Rainfall which does not evaporate or become runoff acts to recharge the surficial aquifer, the surface of which varies from several inches to several feet below the ground elevation. There is low to moderate aquifer recharge of the Floridan Aquifer within the planning area. The direction of groundwater flow of the surficial aquifer varies with the local topography while the Floridan Aquifer flows generally southwest toward Tampa Bay.


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There are two major river basin systems which drain the planning area: the Hillsborough, flowing north and west, draining the central and northern portions of the planning area; and the Alafia, flowing south and west, draining the southeastern and southwestern areas. The tributaries to these rivers and their respective drainage basins are as follows in Table 5: TABLE 5. RIVER BASIN SYSTEMS

Basin Drainage Area

Location Main Drainage Route

Hillsborough River System Water Oak Branch Basin

East side of Plant City and Northeast Planning Area.

Water Oak Branch – Itchepackesassa Creek - Blackwater Creek - Hillsborough River.

Westside Canal Basin

West side of Plant City and Northwest Planning Area Receives WWTP Discharge.

Westside Canal (Westside Branch) - Mill Creek - Pemberton Creek – Lake Thonotosassa – Flint - Hillsborough River.

Sparkman Branch Basin

South Central Plant City and Western Planning Area - Includes Lake Walden.

Via Marshlands, West and North - Sparkman Branch - Pemberton Creek - as above.

Alafia River System Turkey Creek Basin

Southwest Planning Area.

Via lowland marshes, Southwest Turkey Creek - Alafia River (2 miles upstream of Lithia Springs).

Howell Branch Basin

Southeast Planning Area.

Howell Branch and English Creek - North Prong Alafia River. Headwaters mainly wide marshy areas.

Existing Drainage System Facilities Ideally, the provision of stormwater facilities should be made in conjunction with urban development, and this has been the case since 1973 in Plant City. Due to lack of such policies previous to that time, there are areas within the City which are presently experiencing problems as a result of inadequate storm drainage facilities. As would be expected, these generally occur in the most densely developed and heavily traveled areas where problems of this nature result in the greatest inconvenience through restrictions to vehicular traffic and damage to street paving and private property. At the time Plant City was established as a community, storm drainage was not a problem. The route for the railroad to Tampa was selected, generally, along the highest ground and the north-south railroad followed the ridge between Water Oak Branch and the stream comprising the Westside Canal. It was only natural that the City should grow around the intersection of these two railroads.


As the City grew, the lower, poorly drained areas were developed. This, coupled with an increased stormwater runoff resulting from a more densely developed urban area, created many stormwater drainage problems in various sections of the City. Many of these problems are localized and are of minor significance, limited to the flooding of a single intersection during a heavy rain; others are more extensive and serious in nature, involving areas of several acres containing many City blocks. The first storm sewers in Plant City were constructed in 1913. They are located in the area from Haines Street to Baker Street and from Wheeler Street to Water Oak Branch. Also constructed at that time were storm sewers along Herring, McLendon and Franklin Streets, which drain to Westside Canal. These systems are still in service. The major storm sewers that have been constructed in Plant City in recent years have been in connection with the urban construction of the Florida Department of Transportation streets on South Collins Street, State Road 39; East Baker Street, U.S. Highway 92; Thonotosassa Road, State Road No. 600A; and Alexander Street, State Road 39A. These sewers were built to serve specific state road projects and were not designed to encompass any overall drainage plan for the City. Other major storm drainage projects undertaken by the City included concrete sewers along Warren, Ohio, Haines and Jenkins Streets, and construction of a large culvert along the Water Oak Branch between Haines and Laura Streets. These projects were designed to help provide overall stormwater relief to the Water Oak Branch and Westside Drainage Areas. The final additions to the stormwater system took place in 1983 with the enlargement of selected structures, canal regrading and the construction of retention basins for both the Water Oak Branch and Westside Canals. As streets were developed, more and more culverts were constructed to the Water Oak Branch and Westside Canals. Since these two waterways are natural drains, they have a fairly uniform slope even though some drainage structures and canal sections are inadequate in size and are above the optimum grade.


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Prior to 1970, in the absence of a master drainage plan, a system of ditches was developed along the sides of the streets for local stormwater relief. For small areas, the ditch drains cause no particular problem other than an unsightly appearance; but when they are required to serve large drainage areas in flat terrain, ditches may be four to five feet deep. At these depths, ditches become hazardous to vehicular traffic and potential habitats for snakes and vermin. Additionally, such structures are difficult to maintain with respect to weed control and debris removal. The City initiated stormwater master plans for the Westside Canal, and the Eastside Canal to address flooding issues that have historically plagued the City. These along with more stringent regulations regarding allowable runoff have improved conditions along the Westside Canal and Eastside Canal. While projects still remain for the completion of the Eastside Canal Master Plan the City is progressing towards completion. The City also completed a pilot project in conjunction with Hillsborough County and the Southwest Florida Water Management District at the McIntosh Park site. This facility diverts water from the Eastside Canal and treats the water using both natural systems and chemical controls. Stormwater Management Plan History - Past analysis of stormwater drainage for Plant City has been directed at specific areas for the design of subsystem elements such as individual culverts or street storm sewers. The first basin-wide plan was developed in 1970, with the intent of providing enough capacity to allow adequate drainage throughout the urban area of that period. Although some of the structural recommendations were translated into system improvements, notably the rehabilitation of some portions of the canal system, major portions of the plan were not carried out. A portion of the study was reviewed in the early 1980’s to provide for relief of stormwater problems within the Central Business District. This review also incorporated concepts of stormwater treatment through detention/retention into its recommendations. The construction of facilities which took place in 1983 was the result of this effort. The replacement of some ditch sections with storm conduits, the retention at the source, swales of the “first flush” of runoff for areas being sewered and the construction of diversion detention basins for the two main drain canals.


Priorities - The main intent of the Stormwater Management Plan is to develop a drainage system which: 1) provides a level of flood protection for life, property, and community activities that maximize the citizen benefits received for the costs incurred; and 2) protects and enhances the surface and underground water resources of the City and State. The order of priorities which guides the development of the system is:

1. Protect citizen health and safety. 2. Satisfy statutory requirements. 3. Extend benefits to existing City residents. 4. Expand system by planned increments to serve area growth. 5. Reduce impacts to the system by adopting regulations that reduce

downstream impacts. 6. Meet State water quality standards at all discharges from stormwater

treatment systems. Level-of-Service The City has the following standards for stormwater management facilities: Roadways: No encroachment outside of the gutter line for the 25-year 24-hour storm event. Major Ditches, Canals: All crossing shall be designed to safely convey drainage as a result of the 100-year 24-hour storm event. Floodplain: 1% chance of occurrence in any year. Designed as the 100-year - 24-hour event. Floodplain encroachments shall be compensated as cup for cup compensation on the developed site. Development: Development shall be designed to treat the first ½ inch of runoff from the site for dry detention systems. Wet detention systems are required to detain the first 1 inch of runoff. Attenuation: All sites larger than ½ acre shall be required to attenuate the discharge to the predevelopment condition unless located within a volume sensitive or closed basin. Water Quality - The level-of-service concerning stormwater quality shall involve using data and recommendations from the master drainage plan effort and from SWFWMD, level-of-service standards for stormwater drainage will address water quality and quantity for both existing and new development.


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The City shall comply with all applicable National Pollution Discharge Elimination System (NPDES) permits and use the U.S. Environmental Protection Agency (EPA) requirements for the NPDES stormwater discharge permit as a minimum water quality standard for stormwater drainage. The City has completed a water quality treatment facility in conjunction with Hillsborough County and the Southwest Florida Water Management District to address water quality issues in the Eastside Canal. The system is in place and functioning, but data on the system effectiveness is limited due to the recent completion of the facility. Design Standards - The City is in the process of finalizing new design standards for stormwater management. Historically, the City relied upon the existing design standards developed by the Florida Department of Transportation and the Southwest Florida Water Management District as guiding principles. The new design standards will incorporate the results of the Westside and Eastside Canal Master Plans along with other drainage basin information to minimize impacts to receiving water bodies and attenuate discharge rates. Regulatory Review - The Engineering Division is responsible for the development and implementation of stormwater regulations within the City. The City has implemented interim standards more stringent than those previously used and performs its review in conjunction with the Southwest Florida Water Management District, and Hillsborough County EPC. Since no formal policies were established regarding design standards for stormwater management systems, the interim standards were developed consistent with the Southwest Florida Water Management District regulations. While not formally adopted, the interim standards represent the City’s next step in developing formal regulations for a stormwater management needs assessment. Structural needs for the Eastside Canal and Westside Canal were identified in master plans developed for the respective basins. The City has completed the improvements outlined in the Westside Canal Master Plan and is working towards completion of the improvements to the Eastside Canal. The remaining basins within the City have not been evaluated and will need to be analyzed to determine what improvements will be required.


Capacity Analysis System Survey - A complete survey of the remaining basins will need to be completed to accurately evaluate any needed improvements. The City has initiated a project within the Engineering Division to complete that task. At this time the topography has been completed for the City and modeling of the Alafia tributaries has started. The City, upon completion of the Alafia basin, will begin modeling of the remaining Hillsborough River sub-basins that originate within the City. Method - Stormwater modeling using Advanced Interconnected Pond and Routing software along with field verification of historic stream levels will be used to generate computer models for each sub-basin within the City. The City will utilize data from recently completed topographic surveys, United States Soil Conservation Service, Southwest Florida Water Management District and the U.S. Geological Survey to calibrate the model prior to implementation. Stormwater System Deficiencies - Identified stormwater deficiencies exist in the Eastside Canal area and will remain until the projects in the master plan can be completed. Other areas of the City experience minor flooding that will require the installation of a stormwater conveyance system. The City will need to develop a City-wide master plan to address historic areas that were developed with limited or no stormwater management systems. Summary and Recommendations - What follows is the description of a process which will result in an effective and serviceable Stormwater Management Plan: Steps in the Process: The following tasks are necessary for implementation of the Stormwater Management Plan: 1. Finalize and adopt stormwater development standards. 2. Perform analyses of each sub-basin within the City to determine where

localized flooding exists. 3. Coordinate water quality analyses with the Florida Department of

Environmental Protection and the Southwest Florida Water Management District.

4. Develop and adopt a Capital Improvements Program (CIP) outlining where and when improvements to the system will be made.

5. Adopt water quality and quantity regulations for sensitive areas subject to flooding or poor water quality.

Capital Expenditures Plan - The structural aspects of improvements to address recognized deficiencies have been organized and will be shown in the CIP (Eastside Canal Stormwater Management Master Plan).


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V. POTABLE WATER SUB-ELEMENT EXISTING CONDITIONS Area of Service Potable water service by Plant City is supplied by the Plant City Public Works Department within the incorporated City limits, which comprise approximately 28 square miles. Minimal areas outside the City limits are also served by the City Potable Water System. The mechanism by which Plant City extends its infrastructure services to accommodate development is through annexation. In this way, services are concurrent with application of municipal regulations and funding requirements, so as to provide uniform and equitable municipal costs and benefits. Existing Potable Water System Description The City’s Potable Water Distribution System is currently undergoing a significant expansion to provide service outside the City Limits to residents potentially affected by alleged groundwater contamination by a local industry. This 7 mile pipeline extension will provide service to, and provide additional capacity for future development in the area. The City’s Potable Water Supply System includes four independent wells, each with it’s own tretment and storage facilities. The four facilities have a combined annual average permitted capacity of approximately 7.4 million gallons per day. One new facility with a design capacity of approximately 2.4 million gallons per day is scheduled to be complete in 2010, for a combined capacity of over 9.8 million gallons per day. The sole source of potable water for the Plant City system is the Floridan Aquifer, from which water is pumped via wells several hundred feet in depth. The wells supplying the Plant City water system provide water of a quality which generally requires only disinfection and system protection from corrosion and iron precipitation. This is accomplished by chlorination and periodic iron sequestrant addition at the well head. The water is then pumped into storage tanks, from which it flows by gravity or by pumping to the distribution system. There are now four active storage tanks in Plant City. Each of the tanks are filled from their respective well directly. The elevated tanks are described in Table 7. The combined storage volume of all tanks is 2.25 MGD.


TABLE 6. WATER PRODUCTION FACILITIES

Site

Operational Status

Location

Date

Depth

Well Casing

WTP Max‐Day Permit Capacity, mgd

Well Annual Ave. Day Permit Capacity, mgd

High Service Pump Capacity gpm

Well #5 Reliable Service 1903 Commerce St 1965 800’ 156’ of 18” 2.15 0.788 1,100 Well #6 Reliable Service 2708 E. Cherry St. 1974 1203’ 224’ of 18” 3.60 2.069 n/a Well #7 Reliable Service 2905 Airport Rd. 1982 734’ 198’ of 18” 3.60 2.069 n/a Well #8 Reliable Service 1101 W. Alexander St. 1989 800’ 230’ of 18” 4.9 2.463 n/a Well #9 Isolated facility 4606 N. Paul Buchman

Hwy. 1997 95’ 63’ of 2” 0.00 0 n/a

Subtotal 14.25 7.389 n/a Well #10 Not in Service 3000 N. Paul Buchman

Hwy. 2005 800’ 150’ of 18” 5.0 2.463 3,000

Totals 19.25 9.852 n/a

Source: Plant City Utilities Department, July 2012

TABLE 7. WATER STORAGE FACILITIES Site Operational Status Location Tank Description Rated CapacityTank #3 Active 1903 Commerce Street Ground Concrete ‐ 2000 0.750 M.G. Tank #4 Active 2708 E. Cherry Street Elev. Steel ‐ 1978 0.500 M.G. Tank #5 Active 1101 W. Alexander Street Elev. Steel ‐ 1986 0.500 M.G. Tank #6 Active 4004 National Guard Dr. Elev. Steel ‐ 1993 0.500 M.G. Tank #7 Future 3000 N. Paul Buchman

Hwy. Ground Concrete 1.000 M.G.

TOTAL STORAGE 2.25 M.G. (3.25 Future) Source: Plant City Utilities Department, July 2012 Command and control of the system is based on continuous monitoring and telemetry of storage tank water elevations and other pertinent data to a centralized location. Well pumps are automated, using storage tank water levels to provide on/off activation. Operating in this manner, the Average Daily Demand on the system is met by well pumping output, while Peak Demands are met by a combination of well pumping and storage. The reader will refer to Figure 4, Existing Potable Water Facilities and Figure 5, Proposed Potable Water Facilities. They will illustrate the discussion of potable water system components which follows. Water Production Facilities - Plant City is served by four active wells which pump water from the Floridian Aquifer. Details concerning the age, depth, production of the individual wells may be found in Table 6. The gross combined maximum production and high service pumping capacity of these installations is approximately 14.25 MGD, well above the permitted annual average capacity of 9.852 MGD. Until the new well and water production facility are placed into service, the system capacity should remain


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within the cumulative permitted capacity of the existing facilities, 7.389 MGD. The entire product is delivered to the storage tank facilities and is chlorinated prior to release into the water system for public use. Water Treatment - Disinfection by chlorination at the well head is the main treatment given to raw water in Plant City. The delivery capacity of chlorine is matched to the pumping capacity at each well. Raw water quality is well within the allowable standards established by FDEP regulations. No trends in deteriorating water quality have been observed for Total Dissolved Solids, Iron or Odor. Water Storage Facilities - There are four active storage facilities in Plant City. The combined storage volume of all tanks is 2.25 mg. All tanks are continuously monitored for water level with the data transmitted to a centralized operator location. Location of tanks is shown on Figure 7. Water Distribution System - The City has over 1 million linear feet of water line from 2” to 16”. The transmission mains serving Plant City are shown in Figure 7 and are primarily 10-inch and 12-inch in diameter, with a small amount of 16-inch diameter pipe. The 12-inch portions are predominantly located on the west side of the City. Of the service network, primary mains are generally 6-inch and 8-inch in diameter on the east side, with a recent addition of several thousand feet of 12-inch diameter along Wiggens Road and Coronet Road, extension of 12” water line from the intersection of Timberlane and Trapnell Road to Trapnell Elementary, and the extension of 12” water line from Medulla to Springhead Elementary. The condition of existing piping varies, with some locations being near the end of their service lives. Regulatory Framework Federal - The federal government has established quality standards for the protection of water for public use, including operating standards and quality controls for public water systems. These regulations are provided in the Safe Drinking Water Act, Public Law 93-523. This law directed the Environmental Protection Agency (EPA) to establish minimum drinking water standards. The EPA standards are divided into “primary” (those required for public health) and “secondary” (recommended for aesthetic quality) categories. State - In accordance with federal requirements, the Florida Legislature has adopted the Florida Safe Drinking Water Act, Sections 403.850403.864, F.S. The Florida Department of Environmental Protection (FDEP) is the State agency responsible for implementing this act. In this regard, FDEP has promulgated rules classifying and regulating public water systems under Chapter 62-550 and 62-555, F.A.C. The primary and secondary standards of the Federal Safe Drinking Water Act are mandatory in Florida.


The Southwest Florida Water Management District (SWFWMD) is responsible for managing water supplies to meet existing and future demands. Regulation of consumptive use is achieved through a permitting system through which water resources are allocated among the permitted consumers. The SWFWMD rules pertinent to Plant City are contained in Chapter 40D-2, F.A.C. Local - The Environmental Health Division of the Hillsborough County Health Department is responsible for enforcement of the programs required by the FDEP regulations. Water quality and production records are submitted by the City Public Works Department to the County Health Department for determination of compliance with FDEP regulations. Level-of-Service (LOS) To define a LOS standard for the Water Utility, facilities requirements were assessed on their conformance with water quality standards as set forth in the Florida Safe Drinking Water Act, demands for water use, provision of adequate circulation for disinfection, and delivery of required Fire Flow. An analysis of billing records and well pumping data in conjunction with service population estimates provided the basis for the level-of-service parameters. Pursuant to Chapter 163 Florida Statutes, LOS standards must be established which will ensure that adequate facility capacity will be provided for future development prior to issuance of development orders or permits. Chapter 163 F.S., requires that LOS standards be established and utilized as follows for potable water: Minimum design flow, storage

capacity, and pressure for potable water facilities.

The Level-of-Service was amended in 1998 as shown in the Goals, Objectives and Policies section of the Capital Improvements Element and is reflected as follows: City water systems: 130 gallons per day adjusted per capita water use. Gross adjusted per capita water use shall be computed using Southwest Florida Water Management District accepted methodology for the Northern Tampa Bay Water Use Caution Area. This methodology includes specific population adjustments for tourist or other seasonal populations. For consistency, the same population values are used for calculating sanitary sewer LOS compliance in the City of Plant City.


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FUTURE NEEDS ASSESSMENT The intent of this section is to delineate improvements, both structural and nonstructural, which must be made to the Plant City potable water system and its associated organizational entity to provide the defined level-of-service to both existing and projected service populations. In the area of water production, wherein additional wells are proposed to meet future service requirements, it is understood that all such proposals fall under the permitting authority of the Southwest Florida Water Management District (SWFWMD). Prior to design and implementation of the Capital Improvements, the City shall seek a “conceptual type” review of those proposals over which SWFWMD has jurisdiction. Capacity Assessment The City has recently completed an engineering study to estimate future growth and subsequent utility demands through the year 2025. (Jones Edmunds Report, May 2008) The study included growth of the City limits to approximately 31 square miles. Population projections were developed utilizing Hillsborough County Metropolitan Planning Organization Traffic Analysis Zones (TAZs). For consistency, the same projections were used to estimate needs for sanitary sewer services in the City of Plant City. The population and potable water demand projections developed by the study are provided in Table 8. TABLE 8. WATER SERVICE PROJECTION

Year City Population

Residential Demand (MGD)

Commercial and Industrial

Demand (MGD)

Total Service Area Water Demand

(MGD) 2015 40,207 3.74 4.9 8.64 2025 51,769 5.24 6.70 11.94

Source: Plant City Public Works Department, 2008 Utilizing the above projected demands and the methodologies of the Florida Department of Environmental Protection for Public Water System Capacity Analysis Reports, the City has estimated future demands and system storage requirements as shown in Tables 9 and 10. TABLE 9. ESTIMATED FUTURE SERVICE DEMAND

Year Average Day Demand (MGD)

Max Day Demand (MGD)

Peak Hour Demand (MGD)

2010 7.06 10.59 17.65 2015 8.64 12.96 21.61 2020 10.29 15.44 25.73 2025 11.94 17.92 29.86

Source: Plant City Public Works Department, 2008


TABLE 10. FUTURE FIRE FLOW REQUIREMENT Year Equalization

Storage (MGD) Fire Storage

(MGD) Total Storage

Required (MGD) 2010* 1.22 0.62 1.84 2010 0.14 0.00 0.14 2015 0.80 0.10 0.90 2020 1.49 0.41 1.90 2025 1.90 0.72 2.90

Source: Plant City Public Works Department, 2008, Note, 2010* indicates storage requirements based on current production facilities. All other data includes increased production capacity from new water supply facility to be placed into service in 2010.

Performance Assessment The general operational performance of the system is good, obtaining full service from the available system components. Maintenance is performed regularly, and the control system achieves efficient utilization of the system capacity. The following paragraphs will discuss specific system components, and focus on areas where problems have been experienced or are seen as developing. Wells and Water Production Facilities - The current sustained capacity totals MGD. The City shall evaluate the peak production capacity of existing facilities and assure availability of existing permitted Maximum Daily Flow capacity. Where feasible the City shall document increased capacity through re-rating the permitted capacity of each facility. Water Storage Facilities - The three elevated and one ground storage tanks are in good physical condition and are inspected in accordance with FDEP rules Water Distribution System - The City has over 1 million linear feet of water lines ranging from 2” to 16”. The City recently completed an inventory of the sizes and lengths of water line and is developing a new water model based upon this update. The City will utilize the hydraulic model to better service customers by evaluating water age, pressure and flow. The model will also be used as a forecasting tool for future expansion of the system. Raw Water Quality - Raw water quality is well within the allowable standard established by FDEP regulations. No trends in deteriorating water quality have been observed for Total Dissolved Solids, Iron or Odor. Monitoring and Metering - The City maintains an active program to check meter performance and to repair or replace meters when necessary. Meters are provided on all potable water and reclaimed water service points.


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Water Treatment - The current water quality suggests that disinfection will continue to be the only treatment required for the near future. Recommendations: To meet the existing and projected needs of the City through the year 2025, the following recommendations are made: 1. Develop a new water model utilizing updated information. 2. Complete construction of a new Potable Water Supply and Storage

Facility before the end of 2010. 3. Institute a program of systematic replacement for old, deteriorated or

undersized pipe. 4. Maintain economic viability through updating of an appropriate rate

structure, as is currently in place, and accurately apportioning expansion costs to future users through development fees.

5. Develop policies and procedures for oversizing of developer initiated projects.

6. Finalize development standards for the installation of new systems. 7. Evaluate the use of existing private wells for the orderly expansion of the

water system into agricultural areas. 8. Develop wellhead protection regulations. The structural portion of these recommendations takes the form of a Capital Expenditures Plan as delineated in the Plant City Capital Improvement Program. The service area has been planned so utilities may be expanded in an orderly fashion under a phased construction program, according to the projections in growth provided by The Planning Commission. Proposed future improvements to the City’s potable water facilities are shown in Figure 8.


VI. GOALS, OBJECTIVES AND POLICIES PUBLIC FACILITIES: GENERAL CONSIDERATIONS GOAL 1: Needed public facilities shall be provided in a manner which protects investments in existing facilities and promotes orderly, compact urban growth. Objective 1.A: The City of Plant City will continue to implement procedures to ensure that at the time a development permit is issued, capacity, consistent with the level-of-service standards, is available, or will be available, when needed to serve the development. Policy 1.A.1:

The following level-of-service standards are hereby adopted, and shall be used as the basis for determining the availability of facility capacity and the demand generated by a development:

Sanitary Sewer Facilities 125 gallons per day per capita for the overall system (residential, commercial and non-significant industrial uses) exclusive of infiltration and inflow and exclusive of significant industrial users.

200,000 gallons per day

Comprehensive Plan for the City of Plant City Florida ......Hydraulic Level-of-Service (LOS) -...

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Transcript of Comprehensive Plan for the City of Plant City Florida ......Hydraulic Level-of-Service (LOS) -...