2002 Initial Study DRAFT - San Bernardino Countycms.sbcounty.gov/Portals/1/Newsfeeds/Management...

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SAN BERNARDINO COUNTY

DRAFT INITIAL STUDY ENVIRONMENTAL CHECKLIST FORM

This form constitutes the contents of an Initial Study pursuant to County Guidelines under Ordinance

3040 and Section 15063 of the State CEQA Guidelines.

PROJECT LABEL:

APN: Various

Applicant: County of San Bernardino

Regional Parks Department

777 E. Rialto Avenue

San Bernardino, CA 92415-0763

USGS Quad: San Bernardino North, Calif.

Community: Crestline T, R, Section: T2N

Section 23

R4W

Location: Lake Gregory, Crestline, California Thomas Bros.: Year 2005, Pages 516 - 517

Planning Area: Crestline

Staff: Philip Krause, County of San Bernardino


Rep: Lilburn Corporation

Proposal: The San Bernardino County Regional Parks

Department proposes to remove currently accumulated

sediments from various locations in the perimeter of

Lake Gregory, to construct or improve three

debris/sediment basins, to re-construct and enhance an

ephemeral channel, and to conduct on-going sediment

management and/or removal of future sediment

accumulation in and around the lake.

PROJECT CONTACT INFORMATION:

Lead agency: County of San Bernardino


Contact person: Philip Krause, Senior Park Planner, County of San Bernardino Regional Parks Department

Phone No: (909) 387-2588 Fax No: (909) 387-2052

E-mail: [email protected]

Project Sponsor: County of San Bernardino, Regional Parks Department 777 East Rialto Avenue

San Bernardino, CA 92415-0763

Lake Gregory Sediment Management & Bioretention Program Initial Study

January 2014

2

Project Background

The San Bernardino County Regional Parks Department (Regional Parks) operates Lake Gregory as a

regional park that offers year-round recreational opportunities to its patrons. Amenities available at the

park are anchored by Lake Gregory and include: seasonal boating and swimming, and year-round

shore fishing, picnic facilities, exercise stations, a skate park, and a dog park.

Lake Gregory is a man-made lake located in the community of Crestline in the San Bernardino

Mountains. Refer to Figures 1 and 2 for a Regional Vicinity Map and a Project Location aerial

photograph of the lake. The lake is naturally fed by storm runoff and snow melt from the east and

west forks of Houston Creek. The normal water level of the lake is set by the Lake Gregory Dam

spillway at 4,517 feet above mean sea level. The capacity of the lake is increased by three feet of

depth in the spring and summer months via the installation of flashboards on the lake spillway. The

flashboards are removed on September 10th

of each year. Water levels at the lake may fluctuate by up

to five feet below the spillway elevation depending on the season’s precipitation.

Regional Parks is proposing to establish a restoration/improvement project for the near-term sediment

removal, and an on-going maintenance program of sediment removal at Lake Gregory to improve the

lake’s beneficial uses. The Proposed Project’s objectives are to establish a plan for routine

maintenance of the lake in order to improve water clarity and quality, enhance recreational features,

and improve fishery habitat resources of the lake. Regional Parks proposes to conduct maintenance

activities on a year- round basis with seasonal restrictions on certain activities.

Environmental Setting

Lake Gregory Regional Park has been in operation since the completion of the Lake Gregory Dam in

1938. Lake Gregory Regional Park offers a variety of recreational opportunity to its patrons including:

fishing, boating, swimming, picnic facilities, a skate park, a dog park, and walking and fitness trails.

The landscape surrounding and adjacent to Lake Gregory consist of both native and non-native

vegetation types. Residential and commercial development exist adjacent to the project site as well as

all around the lake. Field surveys of the proposed construction sites and the lake perimeter were

conducted to assess habitat. Vegetation communities and habitats in the project vicinity are depicted in

Figure 3.

Proposed Lake Gregory Sediment Management and Bioretention Program

The Lake Restoration/Improvement Project encompasses four primary areas around the lake that have

been identified for the removal of accumulated sediment, and development of three new/improved

debris basins designed to prevent future sediment from impacting lake bottom elevations, isobaths and

the lake’s aquatic habitat. The four primary restoration/improvement areas are shown on Figure 4 and

are described as follows:

Houston Creek West:

Area 1 – Existing Houston Creek West – West Debris/Sediment Basin

This existing debris basin is located on the west side of Lake Gregory Drive adjacent to the Crestline

Public Library (See Figure 4). Basin improvements within this area will create an approximate

0.85-acre basin area encompassing an approximate 14,800 square foot soft bottom area.


January 2014

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Construction of the improved basin will entail the excavation of approximately 1,660 cubic yards of

accumulated sediment material and will include the importation of approximately 120 cubic yards of

rip-rap materials to armor portions of the basin side-slopes.

Area 2 – Proposed Houston Creek West - East Debris/Sediment Basin

This new sediment basin will be developed on an approximate 1-acre area located on the east side of

Lake Gregory Drive across from the Crestline Public Library (See Figure 4). This area has historically

been the inlet area for Houston Creek into Lake Gregory. Basin development will entail creation of a

raised basin designed to capture excess sediment flows from the Houston Creek West-West Debris

Basin and prevent impact on the lake’s aquatic system.

Construction of this basin will entail the placement of approximately 7,700 cubic yards of fill and rip-

rap below the OHWM and placement of approximately 2,750 cubic yards of fill, rip-rap, and concrete

above the OHWM.

Additionally, site preparation for construction of the Area 2 basin will involve the removal of

approximately 1,300 cubic yards of sediment in the Lake Gregory swim area along the South Beach,

the majority of which is located below the OHWM. Sediment removal at this location would occur as

a one-time activity. Continued regular maintenance for sediment control of the beach area following

construction of the sediment basins would occur as described below in the proposed Lake Gregory On-

Going Maintenance Program.

Houston Creek South:

Area 3 - Proposed Houston Creek South Debris/Sediment Basin and Channel

This basin will be developed on an approximate 1.2 acre area located on the south side of the existing

72-inch Houston Creek outlet culvert (See Figure 4). Under existing conditions the culvert transmits

flow from an approximately 853-acre watershed to the ephemeral channel that discharges to the lake.

Constructing this new basin will require excavation of approximately 9,950 cubic yard of materials and

placement of approximately 167 cubic yards of rip-rap.

The existing approximate 900-foot linear channel will be reconstructed and re-contoured to restore

storm flow capacities. Restoration and re-contouring will entail excavation of approximately

1,250 cubic yards of accumulated sediment and debris from within the channel. Approximately

534 cubic yards of gabions, and 711 cubic yards of Reno mattress reinforcement materials will be

placed on the side slopes to protect them from future erosion. The channel will remain a soft-bottom

channel. The channel outlet will be re-contoured to discharge into the lake approximately 50 feet south

of its current outlet location.

Area 4 - Sediment Removal

Accumulated sediment since the mid 1980’s has created an approximately 1.29 acre sand delta

formation at the outlet of the south fork of Houston Creek where it enters the lake (See Figure 4). The

restoration project will require removal of approximately 12,300 cubic yards of accumulated sediment

reducing the sand delta by approximately 0.85 acres. Additional sediment removal is also anticipated

from the lake’s east bank (opposite of the delta). The quantity of removal is anticipated to be


January 2014

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approximately 5,000 to 10,000 cubic yards of accumulated sediment. In Area 4, approximately 7,500

to 10,000 cubic yards will be removed from below the OHWM.

At conclusion of these one-time construction projects it is anticipated that excessive sediment routinely

entering the lake will be effectively eliminated and the lake will have been restored to an approximate

1995 condition. To regularly maintain these restored lake conditions, the following on-going

maintenance program is proposed:

Proposed Lake Gregory Maintenance Program

The Lake Gregory Maintenance Program will entail a number of maintenance activities that may be

conducted as determined necessary during the Park Operational Season period of March to September.

These activities include:

Aquatic plant weed control via application of aquatic herbicides based upon and consistent with

the written application recommendations and best management practices of the County’s State

General NPDES Permit for the Discharge of Aquatic Pesticides for Aquatic Weed Control

(CAG990005). These activities conditionally take place prior to the swim beach opening on

Memorial Day weekend, and on selective days during the season when the swim beach is

closed, allowing time for absorption and dissipation.

Swim beach area lake bottom footfall and/or foot contact grooming below the water line to a

depth of six (6) feet based on current elevation. Grooming will be accomplished manually and

mechanically. Workers with landscape and debris rakes will manually groom the lake bottom

surface, removing foreign objects and decaying plant material to an approximate depth of three

feet while ensuring a consistent, contoured and safe foot contact area for swimmers. A power

boat pulled drag will be used at low speed to accomplish the same tasks and minimize turbidity

to an approximate depth of six (6) feet. All material removed from the lake will be disposed of

in a safe and legal manner.

Proposed on-going maintenance activities would be conducted as necessary and limited to the Park

Non-operational (off-season) period of September through March. The following activities will be

conducted as determined necessary by Park management/staff to ensure protection of the lake, the

fishery, and the recreational resources available at Lake Gregory Regional Park. Maintenance activities

limited to the Off-Season include:

Houston Creek West - West Debris Basin, debris and sediment removal. Accumulated debris

and sediment within the bed of this existing debris basin would be completed by mechanical

means including wheeled and tracked vehicles when necessary, or at a minimum semi-

annually. No wheeled or tracked vehicles will be allowed on the vegetated basin side slopes

except on the designated access ramp(s). Care will be taken to preserve the side slope

vegetation as much as practical to provide for enhanced riparian and wetlands habitat.

Houston Creek West - East Sediment Basin, sediment removal. Accumulated sediment within

the new basin will be removed by mechanical means, but limited to long-reach excavators

and/or wheeled vehicles when necessary, or at a minimum semi-annually. No tracked vehicles

will be allowed below the OHWM.

Houston Creek South Debris Basin - Debris and sediment removal. Accumulated debris and

sediment within the bed of this debris basin would be completed by mechanical means

including wheeled and tracked vehicles when necessary, or at least semi-annually. No wheeled


January 2014

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or tracked vehicles will be allowed on the vegetated basin side slopes except on the designated

access ramp(s). Care will be taken to preserve the side slope vegetation as much as practical to

provide for enhanced riparian and wetlands habitat.

Tree and shrub pruning and management. All debris and sediment basins side slopes will be

routinely maintained to keep the soft bottom basins accessible by maintenance vehicles. This

may require periodic tree and shrub pruning so the equipment necessary for accumulated

sediment removal can safely and effectively maneuver within the basin areas.

Lake sediment maintenance removal at outlet locations. Sediment removal will be completed

by mechanical means at the identified locations of culvert outlets on the perimeter of the lake.

Access and topography varies by location; therefore, excavation methods would be site-specific

to each of the outlet locations. Approximately 31 pipe outlets have been identified around the

Lake Gregory perimeter. Regular maintenance is proposed at 13 of the lake outlets (see

Figure 5). Lake outlets vary in size from 4-inches to 36-inches in diameter and contribute to

lake sedimentation at varying rates. Lake sediment removal at the 13 outlet locations identified

on Figure 5 is proposed to occur as determined necessary by the Park management/staff.

Sediment removal would occur under the following conditions:

a) Sediment removal: accumulated sediment removal at the designated locations would be

completed by mechanical means including wheeled and tracked vehicles when necessary.

All sediment removal will be completed while equipment tracks/wheels are located above

the lake’s OHWM.

b) Culvert pipe repair: sediment loads travelling through inlets to the lake have resulted in

clogged inlets in the past. When an inlet is observed to be clogged or flow is observed to be

obstructed by sediment by the Park’s management/staff, culvert outlet cleaning and

grooming will be scheduled. All culvert pipe repair and maintenance activities would be

limited to occur during the Off-Season. Access and topography varies at each of the culvert

inlets; thus maintenance methodologies may vary by location; however, this maintenance

will not require any equipment to be situated below the lake’s OHWM.

REGIONAL VICINITY

FIGURE 1

Project Location

LILBURNC O R P O R A T I O N

Approximate Miles

0 2Lake Gregory Sediment Managementand Bioretention Program Initial Study San Bernardino County, California

PROJECT LOCATION

FIGURE 2LILBURNC O R P O R A T I O N

Approximate Feet

0 600Lake Gregory Sediment Managementand Bioretention Program Initial StudySan Bernardino County, California

Lake Gregory Drive

San Moritz Drive

Lake Drive

Lake

Driv

e

Lake Gregory

Crestline Library

VEGETATION AND HABITAT MAP


Approximate Feet

0 600

Lake Gregory

Lake Drive

San Moritz Dr.

FIGURE 3

Lake Gregory Sediment Managementand Bioretention Program Initial Study

San Bernardino County, California

LEGEND

Semi-Natural Herbaceous

Wetland

Riparian - Willow

Sand Beach

Lacustrine

Disturbed Park

Stream

Ponderosa Pine Forest

Parking Lot

Building/Structure

PROJECT IMPACT MAP

FIGURE 4



Approximate Feet

0 125

Approximate Feet

0 200


Houston Creek West Project Area Houston Creek South Project Area

Area 1: Houston Creek West - West Basin

Area 2: Houston Creek West - East Basin

Area 3: Houston Creek SouthDebris Basin and Channel

Area 4: SedimentRemoval

Source: Alb

ert A. W

ebb

Associa

tes, Lake G

regory D

ebris Red

uction Study C

onceptua

l Deb

ris Basins A

erial: Sa

n Bernard

ino County 1

0/2

01

3

Lake Gregory

LEGEND

Disturbed Herbaceous

Wetland

Riparian - Willow

Sand Beach

Lacustrine

Disturbed Parkland

Stream

Yellow Pine Forest

Parking Lot

San Moritz Dr. Houston Creek West

Project Area

Houston Creek SouthProject Area

CRESTLINELIBRARY

Area 2: South BeachSediment Removal

Houston Creek SouthFork Culvert Outlet


Approximate Feet

0 600

Lake Gregory

Lake Drive

San Moritz Dr.

LEGEND

Outlet location with proposed

Outlet location at a proposedbasin/channel location

off-season sediment removal

1 2 3

4 5

6

7

8

9

12

34

LAKE OUTLET SEDIMENT REMOVAL LOCATIONS

FIGURE 5



Lake Gregory Management & Bioretention Program Initial Study

January 2014

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Potentially

Significant

Impact

Less than

Significant

with

Mitigation

Incorp.

Less than

Significant

Impact

No

Impact

I. AESTHETICS Would the project:

a) Have a substantial adverse effect on a scenic vista?

b) Substantially damage scenic resources, including, but not

limited to, trees, rock outcroppings, and historic buildings

within a state scenic highway?

c) Substantially degrade the existing visual character or

quality of the site and its surroundings?

d) Create a new source of substantial light or glare which

would adversely affect day or nighttime views in the

area?

SUBSTANTIATION:

a) No Impact. The San Bernardino County Circulation and Infrastructure Background Report (2006)

defines a scenic vista as a location that:

Provides a view of undisturbed natural areas;

Includes a unique or unusual feature which comprises an important or dominant portion of the

viewshed; or

Offers a distant view which provides relief from less attractive views of nearby features (i.e.,

mountain backdrops behind urban area).

The Proposed Project does not include tall structures or improvements that would obstruct view sheds of

the mountain backdrops. Proposed construction activities include excavation of new debris and sediment

detention basins. On-going maintenance activities entail maintenance of sediment basins to the basin

design standards, and lake vegetation removal, application of aquatic herbicides, clearing culverts at lake

inlets as necessary, and maintenance/repair of lake outlet structures as necessary; these activities would

not result in impacts to scenic vistas available from the recreation areas of the park and no impacts

would occur.

b) Less than Significant Impact. The following roadways in the vicinity of the Proposed Project have

been designated in the Open Space Element of the County General Plan as scenic routes:

Lake Gregory Drive; and,

Lake Drive from Knapps Cutoff northeast to Dart Canyon Road.

Development along these roads is subject to aesthetic and land use controls outlined in the County’s

Scenic Highway Overlay. Implementation of the Proposed Project would result in clearing of

approximately one (1) acre of ponderosa pine forest for development of the Houston Creek South Debris


January 2014

13

Basin north of San Moritz Drive at the southeast portion of the Project Area. Additional views of the

lake would be available from San Moritz Drive upon clearing of the forested area. Construction of the

basin would not result in landscaping or grading that would prevent or obstruct scenic views; thus

impacts would be less than significant.

c) No Impact. Implementation of the proposed project would involve the improvements to/construction of

three debris/sediment basins, restoration of an ephemeral stream, and implementation of an on-going

lake maintenance program. The purpose of the Proposed Project is to restore the Lake Gregory surface

area and lake bottom elevations to the approximately 1995 status and minimize sediment loads entering

the lake by improving an existing sediment basin and expanding debris/sediment control by constructing

two new basins. The Proposed Project would benefit fishery resources at the lake, increase the lake area

available for water recreation, and improve water quality. The Project would not degrade the existing

visual character or quality of the site and its surroundings and no impacts would occur.

d) No Impact. The Proposed Project does not involve or require lighting. Per the County Noise

Ordinance (83.01.080(g)(3)) all construction activities would be limited to occur between 7:00 a.m. and

7:00 p.m., except Sundays and Federal Holidays; all construction activities would be scheduled during

daylight hours. The proposed project would not require any lighting for operation. No new sources of

light or glare would result from implementation of the Proposed Project; therefore, no impacts are

anticipated.

Potentially

Significant

Impact

Less than

Significant

with

Mitigation

Incorp.

Less than

Significant

Impact

No

Impact

II. AGRICULTURE AND FOREST RESOURCES – In

determining whether impacts to agricultural resources are

significant environmental effects, lead agencies may

refer to the California Agricultural Land Evaluation and

Site Assessment Model (1997) Prepared by the

California Department of Conservation as an optional

model to use in assessing impacts on agriculture and

farmland. In determining whether impacts to forest

resources, including timberland, are significant

environmental effects, lead agencies may refer to

information compiled by the California Department of

Forestry and Fire Protection regarding the state’s

inventory of forest land, including the Forest and Range

Assessment Project and the Forest Legacy Assessment

project; and forest carbon measurement methodology

provided in Forest Protocols adopted by the California

Air Resources Board. Would the project:


January 2014

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Potentially

Significant

Impact

Less than

Significant

with

Mitigation

Incorp.

Less than

Significant

Impact

No

Impact

a) Convert Prime Farmland, Unique Farmland, or Farmland

of Statewide Importance (Farmland) as shown on the

maps prepared pursuant to the Farmland Mapping and

Monitoring Program of the California Resources Agency,

to non-agricultural use?

b) Conflict with existing zoning for agricultural use, or a

Williamson Act contract?

c) Conflict with existing zoning for, or cause rezoning of, forest

land (as defined in Public Resources Code section 12220(g)),

timberland (as defined by Public Resources Code section

4526), or timberland zoned Timberland Production (as defined

by Government Code section 51104(g))?

d) Result in the loss of forest land or conversion of forest land to

non-forest use?

e) Involve other changes in the existing environment, which, due

to their location or nature, could result in conversion of

Farmland, to non-agricultural use or conversion of forest land

to non-forest use?

SUBSTANTIATION:

a) No Impact. Lake Gregory is located on the San Bernardino County Important Farmland 2012: Sheet 2

of 2 published by the California Department of Conservation Farmland Mapping and Monitoring

Program (December 2011). The site is not located on Prime Farmland, Unique Farmland, or Farmland

of Statewide Importance as shown on the map. There is no existing farmland on the project site and no

impacts to farmland would occur.

b) No Impact. Lake Gregory is located on the San Bernardino County Williamson Act FY 2012/2013 Sheet 2

of 2 map published by the California Department of Conservation Division of Land Resource Protection

(2013). The site is not reported to have land enrolled in a Williamson Act agricultural program. No zoning

for agricultural use or Williamson Act contract land uses occur at the site; therefore, no impacts would

occur.

c) No Impact. All project activities would occur on County owned land as identified on General Plan Map

FH22A. Land Use Zoning Districts as identified in the General Plan include Floodway at the lake, open

space on the perimeter parkland, and general commercial at the location of the west existing basin (adjacent

to the Public Library). The Open Space land use designation is applied to land that is legally constrained

from future development and allows only open space, recreation uses, and similar compatible uses. The

purpose of the proposed project is to provide sediment and silt control facilities that would protect and

enhance the recreational uses available at Lake Gregory Regional Park. The Proposed Project would not

conflict with existing zoning or cause rezoning or forest land, timberland, or timberland zoned for

timberland production.


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d) Less than Significant Impact. Implementation of the Proposed Project would result in clearing of

approximately one (1) acre of ponderosa pine forest for development of a debris and sedimentation basin

north of San Moritz Drive at the southeast portion of the Project Area. The Houston Creek South Debris

Basin would be approximately 1.2-acres and a portion of it would be constructed in an area currently

developed as a parking lot. The basin would receive flow from a 72” flood control culvert that drains an

approximately 853-acre watershed. Houston Creek, at this location, is the largest contributing watershed

to Lake Gregory. Sediment loads carried through the existing ephemeral channel to the lake have

resulted in accumulated sediment at the channel and the formation of an approximately 1.29-acre delta at

the channel terminus in the lake. The proposed Houston Creek South Debris Basin would intercept

sediment loads transmitted from the culvert and allow for debris and sediment settling before it reaches

the lake. The basin is a compatible use in the open space designation and its development would

constitute less than significant impacts in the conversion of forest land to non-forest use.

e) No Impact. Implementation of the proposed project would involve improvements to/construction of

three debris/sediment basins, restoration of an ephemeral stream, and implementation of an on-going

lake maintenance program. The purpose of the Proposed Project is to restore the Lake Gregory surface

area and lake bottom elevation to the approximate 1995 status and to minimize sediment loads entering

the lake by improving an existing sediment basin and expanding debris/sediment control by construction

of two new basins. The Proposed Project would benefit fishery resources at the lake, increase the lake

area available for water recreation, and improve water quality. The Project would not involve significant

changes to the existing environment, which, due to their location or nature, could result in conversion of

farmland, to non-agricultural use or conversion of forest land to non-forest use. Thus, no impacts are

anticipated.

Potentially

Significant

Impact

Less than

Significant

with

Mitigation

Incorp.

Less than

Significant

Impact

No

Impact

III. AIR QUALITY - Where available, the significance

criteria established by the applicable air quality

management or air pollution control district may be

relied upon to make the following determinations.

Would the project:

a) Conflict with or obstruct implementation of the

applicable air quality plan?

b) Violate any air quality standard or contribute

substantially to an existing or projected air quality

violation?

c) Result in a cumulatively considerable net increase of

any criteria pollutant for which the project region is

non-attainment under an applicable federal or state

ambient air quality standard (including releasing

emissions, which exceed quantitative thresholds for

ozone precursors)?


January 2014

16

Potentially

Significant

Impact

Less than

Significant

with

Mitigation

Incorp.

Less than

Significant

Impact

No

Impact

d) Expose sensitive receptors to substantial pollutant

concentrations?

e) Create objectionable odors affecting a substantial

number of people?

The Project Site is located in the South Coast Air Basin (SCAB). The South Coast Air Quality Management

District (SCAQMD) has jurisdiction over air quality issues and regulations within the SCAB. To assist local

agencies to determine if a project’s emissions could pose a significant threat to air quality, the SCAQMD has

published its Air Quality Rule Book. The air and dust emissions from the implementation of the Project would

be temporary, occurring during the excavation and grading activities. These were measured based on the

SCAQMD standards and evaluated against the most recent, applicable thresholds.

a) No Impact. The Lake Gregory Restoration/Improvement Project Maintenance Program involves the

construction of or improvements to three debris/sediment basins, the re-construction and enhancement

of a channel, and on-going sediment management program. Upon completion of earthmoving activities,

no permanent emissions would occur from the Proposed Project. Therefore, the Project would not

conflict with or obstruct implementation of the SCAQMD Air Quality Management Plan (AQMD) or

any other applicable air quality plans. No impact is anticipated.

b) Less Than Significant Impact: The Proposed Project construction would primarily require

earthmoving and hauling activities. The Project’s proposed earthwork activities were screened for

emission generation using South Coast Air Quality Management District (SCAQMD) Air Quality Rule

Book guidelines, SCAQMD Off-Road Mobile Source Emissions Factors (2014) and On-Road Heavy-

Heavy-Duty Diesel Trucks 2014 Emissions Factors. These tables are used to generate emissions estimates

for development projects. The criteria pollutants screened for included: reactive organic gases (ROG),

nitrous oxides (NOx), carbon monoxide (CO), and particulates (PM10 and PM2.5). Two of these, ROG and

NOx, are ozone precursors.

Construction Emissions

Construction earthwork emissions are considered short-term, temporary emissions and are estimated in

Table 1. The following construction parameters were assumed:

Lake Gregory Material Handling, Typical daily equipment:

1 Water Truck

1 Dozer

1 Loader

1 Crane

1 Excavator

2 Other Material Handling Equipment

100 On-Road Street Legal Haul Trucks


January 2014

17

Table 1

Construction Emissions

Lake Gregory Restoration/Improvement Project

(Pounds per Day)

Source1 ROG NOx CO PM10 PM2.5

Water Truck 0.6 5.8 3.0 0.2 0.2

Dozer 1.8 14.3 6.7 0.6 0.6

Loader 0.7 5.2 2.8 0.3 0.3

Excavators 0.7 5.0 3.2 0.2 0.2

Crane 0.8 6.6 2.7 0.3 0.3

Other Material Handling Equipment 4.0 28.0 10.2 1.2 1.2

On-Road Street Legal Haul Trucks1 2.1 24.9 8.0 1.0 1.0

Totals (lbs/day) 10.7 89.8 36.6 3.8 3.8

MDAQMD Threshold 75 100 550 150 55

Significant No No No No No Source: SCAQMD Off-Road Mobile Source Emissions Factors (2014)

1SCAQMD Emission Factors for On-Road Heavy-Heavy Duty Diesel Trucks, 2014

As indicated in Table 1, Project emissions would not exceed SCAQMD thresholds.

Compliance with Rule 402 and 403

The County will be required to comply with mandated SCAQMD rules and regulations, including but

not limited to, Rules 402 and 403. Therefore, the following dust control conditions applicable to the site

activities as recommended by Rules 402 and 403 shall be implemented:

1. The project proponent shall ensure that any portion of the site to be graded shall be pre-watered prior

to the onset of grading activities.

(a) The project proponent shall ensure that watering of the site or other soil stabilization method

shall be employed on an on-going basis after the initiation of any grading activity on the site at

least 2x per day. Portions of the site that are actively being graded shall be watered regularly to

ensure that a crust is formed on the ground surface, and shall be watered at the end of each

workday.

(b) The project proponent shall ensure that all disturbed areas are treated to prevent erosion until the

site is constructed upon.

(c) The project proponent shall ensure that landscaped areas are installed as soon as possible to

reduce the potential for wind erosion.

(d) The project proponent shall ensure that all grading activities are suspended during first and

second stage ozone episodes or when winds exceed 25 miles per hour.

During construction, exhaust emissions from construction vehicles and equipment and fugitive dust

generated by equipment traveling over exposed surfaces, would increase NOX and PM10 levels in the

area.

2. To reduce emissions, all equipment used in grading and construction must be tuned and maintained

to the manufacturer’s specification to maximize efficient burning of vehicle fuel. Site development

will be limited to one acre disturbed per day.


January 2014

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3. The contractor shall utilize (as much as possible) pre-coated building materials and coating transfer

or spray equipment with high transfer efficiency, such as high volume, low pressure (HVLP) spray

method, or manual coatings application such as paint brush, hand roller, trowel, dauber, rag, or

sponge.

4. The project proponent shall ensure that existing power sources are utilized where feasible via

temporary power poles to avoid on-site diesel power generation.

5. The project proponent shall ensure that construction personnel are informed of ride sharing and

transit opportunities.

6. All buildings on the project site shall conform to energy use guidelines in Title 24 of the California

Administrative Code as updated to reduce energy consumption and reduce GHG emissions.

7. The operator shall maintain and effectively utilize and schedule on-site equipment and delivery

trucks in order to minimize exhaust emissions from truck idling.

Operational Emissions

Operation emissions will occur primarily as seasonal maintenance of the proposed debris/sediment

basins and channel to remove excessive and accumulated debris and sediment from the previous season.

Additionally aquatic plant/weed control within the Lake Gregory swim area and swim area lake bottom

grooming will occur seasonally. Additional sediment removal may be conducted as determined

necessary during the On-Season period of March to September.

With the exception of occasional clearing or removal of depositional sediments to maintain functional

capacity, routine operational emissions are not associated with the Proposed Project. Therefore, impacts

are anticipated to be less than significant.

c) No Impact: The Proposed Project would not individually exceed any SCAQMD thresholds for criteria

pollutants. The County of San Bernardino General Plan EIR concluded that continued development

would contribute to pollutant levels in the County, many areas of which already exceed State and

Federal air quality criteria. Findings on potentially significant impacts of the General Plan indicated that

policies contained in the General Plan and mitigation measures in the EIR are expected to reduce

emissions associated with future development. However, even after application of these policies and

mitigation measures, the General Plan when viewed as a whole project, is expected to generate emission

levels that would exceed the SCAQMD thresholds for criteria pollutants, resulting in a significant

unavoidable adverse air quality impact. A Statement of Overriding Considerations for the General Plan

EIR was adopted by the County Board of Supervisors. No aspects of the project will exceed the

projections in the General Plan; therefore no impact is anticipated.

d) Less Than Significant Impact: The Proposed Project involves improvements to and/or construction of

three debris/sedimentation basins, restoration of an ephemeral stream, and implementation of an on-

going lake maintenance program. Air quality impacts associated with the project are limited to

construction activities, material handling, and maintenance. As shown in Table 1 impacts are determined

to be less than significant, therefore, the proposed project is not anticipated to impact any sensitive

receptors. A less than significant impact is anticipated.

e) No Impact: The Proposed Project involves improvements to and/or construction of three

debris/sedimentation basins, restoration of an ephemeral stream, and implementation of an on-going lake

maintenance program. Air quality impacts associated with the project are limited to construction


January 2014

19

activities and material handling maintenance. The Proposed Project is not anticipated to generate

emissions that would create objectionable odors affecting a substantial number of people. No impact is

anticipated.

Potentially

Significant

Impact

Less than

Significant

with

Mitigation

Incorp.

Less than

Significant

Impact

No

Impact

IV. BIOLOGICAL RESOURCES - Would the project:

a) Have substantial adverse effects, either directly or

through habitat modifications, on any species identified

as a candidate, sensitive or special status species in

local or regional plans, policies, or regulations, or by

the California Department of Fish and Game or U.S.

Fish and Wildlife Service?

b) Have a substantial adverse effect on any riparian

habitat or other sensitive natural community identified

in local or regional plans, policies, and regulations or

by the California Department of Fish and Game or US

Fish and Wildlife Service?

c) Have a substantial adverse effect on federally protected

wetlands as defined by Section 404 of the Clean Water

Act (including, but not limited to, marsh, vernal pool,

coastal, etc…) through direct removal, filling,

hydrological interruption, or other means?

d) Interfere substantially with the movement of any native

resident or migratory fish or wildlife species or with

established native resident or migratory wildlife

corridors, or impede the use of native wildlife nursery

sites?

e) Conflict with any local policies or ordinances

protecting biological resources, such as a tree

preservation policy or ordinance?

f)

Conflict with the provisions of an adopted Habitat

Conservation Plan, Natural Community Conservation

Plan, or other approved local, regional or state habitat

conservation plan?


January 2014

20

SUBSTANTIATION:

a) Less than Significant with Mitigation Incorporated. The Biological Resources Assessment (BRA) for

the Lake Gregory project site was completed in December 2013 (See Appendix A). The project area

was evaluated to determine habitat or species presence for a list of Candidate, Threatened, or

Endangered plant and animal species determined to have the potential to occur at the project area. These

species were identified as potentially occurring from California Natural Diversity Data Base (CNDDB)

observation records and the U.S. Fish and Wildlife Service San Bernardino County Species List. The

BRA documents the probability of occurrence for these species through direct observation of the species

or the existence of suitable habitat for the species.

The BRA concluded that there is a low probability for presence of Sierra Madre yellow-legged frog

(Rana muscosa), California red-legged frog (Rana draytonii), arroyo toad (Anaxyrus californicus), and

western yellow-billed cuckoo (Coccyzus amerianus occidentalis). Suitable habitat for these species

occurs in the areas with riparian growth in the existing detention basin and in riparian areas along the

perimeter of the lake (see Figure 3). Additionally, the lake provides foraging habitat for the bald eagle

(Haliaeetus leucocephalus) and the species has a high probability of occurrence during the nesting

season. The BRA also identified a moderate probability of occurrence for Mojave tarplant (Deinandra

mohavensis) and low probability of occurrence for salt marsh bird’s-beak (Cordylanthus maritimus ssp.

maritimus) in the riparian and wetland habitat at the existing west debris basin.

In order to avoid and minimize impacts to potentially occurring sensitive species the following

mitigation measures shall be implemented:

BIO-1: Vegetation removal associated with the development of the proposed basin facilities,

channel, and lake sediment removal shall be scheduled to occur outside of the bird

nesting season (March – September). Should vegetation removal occur during the

nesting season a nest clearance survey shall be conducted no more than 30 days

prior to removal of vegetation/trees and the vegetation removal shall be monitored

by a qualified biologist.

b) Less than Significant with Mitigation Incorporated. The BRA identified approximately 3.05 acres of

riparian habitat (2.66 acres of red willow thicket riparian habitat and approximately 0.39 acres of

wetland habitat with dominant red willow thicket vegetation) within the survey area. Riparian

vegetation occurs at the existing Houston Creek West – West Debris Basin and at Houston Creek South

project area and along the alignment of the existing ephemeral channel and delta (see Figure 3). Per the

Jurisdictional Delineation for the Lake Gregory Project, implementation of the proposed project would

impact jurisdictional riparian resources in Project Areas 1, 3, and 4. Approximately 0.63 acres of

riparian vegetation under the jurisdiction of the United States Army Corps of Engineers (USACE) and

the Lahontan Regional Water Quality Control Board (RWQCB) would be impacted, and approximately

1.14 acres under the jurisdiction of the California Department of Fish and Wildlife would be impacted.

Riparian resources at the site are subject to the jurisdiction of the regulatory agencies including the

California Department of Fish and Wildlife under section 1602 of the Fish and Game Code, and the

Lahontan Regional Water Quality Control Board and United States Army Corps of Engineers under

Sections 401 and 404 of the Federal Clean Water Act (CWA).

Applicable regulatory permits per the agencies will be required prior to project implementation for

impacts to riparian resources and jurisdictional waters. Guidelines established by the regulatory


January 2014

21

agencies for issuing of permits include mitigation requirements set forth to restore and maintain existing

aquatic resources and values when unavoidable impacts are identified. Impacts to riparian habitat are

considered unavoidable. There are three general mitigation types that may be implemented: avoidance,

minimization, and compensatory mitigation. In practice, unavoidable impacts are mitigated to the extent

appropriate and practicable by requiring steps to minimize impacts, and finally, compensate for aquatic

resource values. The level of appropriate compensatory mitigation will be determined by the regulatory

agencies during the permitting process, and based on the values and functions of the aquatic resource

being impacted.

The following mitigation measures shall be implemented in order to avoid and minimize impacts to

riparian vegetation and jurisdictional water resources. Compensatory mitigation is anticipated and will

be negotiated with the regulatory agencies during the regulatory permitting process.

BIO-2: Limits of construction shall be identified and marked in the field prior to initiation

of sediment removal activities and basin and channel construction activities. No

extraction of accumulated sediment or construction activities, other than in the

designated areas shall occur.

BIO-3: All excavated sediment shall be deposited in an upland area where it will not be

subject to re-depositing in surface waters.

BIO-4: All construction equipment must be clean and free from oil, grease and loose metal

material, and must be removed from service if necessary to protect water quality.

BIO-5: Construction equipment staging/storage shall occur in a designated upland area.

BIO-6: The County will ensure that its Contractor employs necessary measures to prevent

sediment discharge to surface waters and to prevent the introduction or spread of

noxious/invasive weeds within the project and staging area.

BIO-7: All litter shall be removed from the construction area and disposed of in an

appropriate manner at the end of each construction day to ensure that no litter

enters riparian areas or jurisdictional waters.

BIO-8: Access and topography at the 13 outlets with proposed ongoing maintenance varies

by location, therefore, excavation methods would be site-specific at each of the outlet

locations. Maintenance sediment removal at the outlet locations shall occur under

the following conditions: 1) all sediment removal shall be completed by mechanical

means including wheeled and tracked vehicles when necessary with equipment

located above the lake’s OHWM, 2) equipment access areas will be marked to define

the work area and minimize impacts to adjacent habitat to the greatest extent

practicable, and 3) outlet pipe repair and maintenance, as necessary, shall be

scheduled during the Park off-season.

c) Less than Significant with Mitigation Incorporated. The Jurisdictional Delineation prepared for the

Lake Gregory project site in December 2013 (Appendix B) identified one wetland, located within the

Houston Creek West – West Debris Basin, as defined in Section 404 of the Clean Water Act. Wetlands

are defined by the presence of three environmental parameters, hydrology (presence or evidence of a


January 2014

22

water source), hydric soils (inundated or saturated soils conditions resulting from permanent or periodic

inundation by groundwater or surface water), and hydrophytic vegetation (vegetation typically adapted

for life in saturated conditions). Field surveys to positively identify wetlands were conducted following

the guidelines established in the 1987 Army Corps of Engineers Wetland Delineation Manual and the

2008 Regional Supplement to the Corps of Engineers Wetland Delineation Manual: Arid West Region

(Version 2.0).

Implementation of the Proposed Project would result in unavoidable impacts to approximately

0.38 acres of wetlands. The wetland is located at the basin bottom of an existing debris sedimentation

basin that discharges to Lake Gregory; the wetland was formed due to lack of basin clearing and

maintenance. Under Section 404 of the CWA the US Army Corps of Engineers (USACE) issues

permits for the discharge of fill and dredge material to navigable waters including wetlands. Permits

issued by the USACE are reviewed by the U.S. Environmental Protection Agency, who has veto

authority over USACE Section 404 Permits. The USACE and U.S. EPA have a Memorandum of

Agreement establishing goals for restoring and maintain existing aquatic resources; for wetlands the

USACE will strive to achieve a goal of no overall net loss of values and functions when issuing Section

404 Permits. Additionally, under Section 401 of the CWA the State Regional Water Quality Control

Board has broad authority to review activities affecting waters, including wetlands, and may recommend

that the State Board grant, deny, or condition certification of federal permits or licenses that may result

in discharge to “waters of the United States.” Implementation policy in the Lahontan Basin Plan states

that “for proposed fill activities or other discharges which will result in wetland loss, the Regional Board

will require compensatory mitigation so that there will be no net loss of wetland acreage and no net loss

of wetland function and values when the project and mitigation lands are evaluated together” (Lahontan

Basin Plan, pg 4.9-10).

Appropriate and practicable mitigation to off-set impacts to the wetland resources at the project site will

be required and identified by the regulatory permitting requirements for minimization, avoidance, and

compensatory mitigation as discussed in item b) above. The implementation of the above mitigation

measures (BIO-1 through BIO-7) in addition to compensatory mitigation, to be negotiated during the

regulatory permitting process, would ensure that impacts to wetlands are less than significant. Per the

implementation guidelines of the Lahontan Basin Plan the following compensatory mitigation is

proposed.

BIO-9: The applicant shall provide compensatory mitigation for unavoidable permanent

impacts to riparian and wetland habitat at a minimum 1:1.5 ratio. Compensatory

mitigation may include restoration or creation of habitat as agreed to by the

Proponent and regulatory agencies.

d) Less than Significant with Mitigation Incorporated. Houston Creek to the northeast of the lake is a

wildlife corridor with large undisturbed areas that facilitate the movement of wildlife species across the

mountain range. Project activities are not proposed in that portion of the park and the proposed facility

improvements would not interfere with the wildlife corridor function.

Additionally Lake Gregory supports a cold and warm water fishery for recreation purposes. Generally,

fish species in warm water fisheries spawn from March through July when water temperatures start to

warm up. Usually warm water fishery species will move into shallow rocky or vegetated areas where

they build redds (nests) and lay their eggs. Cold water fish species are stocked at Lake Gregory and do

not spawn at the lake. Spawning habitat for warm water fishery species occurs throughout the perimeter


January 2014

23

of the lake. Shallow, vegetated, sandy and rocky areas provide good habitat for fish to congregate and

spawn. Sediment removal from these spawning areas may have an adverse effect on the warm water

fishery if the sediment removal is performed during the spawning period of March-July.

Implementation of Mitigation Measure BIO-10 will result in avoidance of impacts to the Lake Gregory

fishery.

BIO-10: Sediment removal within the lake shall be timed to avoid the fish spawning season

which is generally March through July.

e) Less than Significant with Mitigation Incorporated. The Plant Protection and Management Chapter

of the San Bernardino County Development Code provides regulation and guidelines for the

management of plant resources. The chapter applies to the removal of regulated trees or plants within

the unincorporated areas of the County and on public lands owned by the County. Regulated Trees in

the Mountain Region of the Plan are defined in Section 88.01.070(b) of the Code and include “living

native trees with 6-inch or greater stem diameter or 19-inch circumference measured 4.5-feet above

natural grade level.” Additionally, the Development Code states that in the mountain region “a perch

tree within a federally identified American Bald Eagle Habitat will not be removed unless an adequate

substitute is provided.” The Development Code also regulates removal of riparian vegetation throughout

the County. Regulation of riparian plants is defined in Section 88.01.080(b) of the Code and applies to

“… to riparian areas on public land owned by the County.”

Implementation of the Proposed Project would involve clearing of approximately one acre of ponderosa

pine forest in the Houston Creek South project area. Riparian vegetation would be cleared in the

Houston Creek West-West basin and in the Houston Creek South project area; implementation of

mitigation measures BIO-1, BIO-2, and BIO-7 (see above) would ensure that impacts to riparian

vegetation would be reduced to a level of less than significant. Removal of trees in the ponderosa pine

forest and removal of riparian vegetation would be regulated by the County ordinance. Less than

significant impacts with mitigation incorporated would occur.

f) No Impact. The Proposed Project is not located within critical habitat, within an existing or proposed

habitat conservation plan, or within a Natural Community Conservation Plan. No impacts are

anticipated.

Potentially

Significant

Impact

Less than

Significant

with

Mitigation

Incorp.

Less than

Significant

Impact

No

Impact

V.

CULTURAL RESOURCES - Would the project

a) Cause a substantial adverse change in the significance

of a historical resource as defined in §15064.5?

b) Cause a substantial adverse change in the significance

of an archaeological resource pursuant to §15064.5?


January 2014

24

Potentially

Significant

Impact

Less than

Significant

with

Mitigation

Incorp.

Less than

Significant

Impact

No

Impact

c) Directly or indirectly destroy a unique paleontological

resource or site or unique geologic feature?

d) Disturb any human remains, including those interred

outside of formal cemeteries?

SUBSTANTIATION:

a-c) Less than Significant with Mitigation: A Historical Resources Records Search was conducted by the

San Bernardino County Museum Archaeological Information Center in December 2013. The Historical

Resources Records Search concluded that based upon available historical maps and records, the Project

Site’s Sensitivity Assessment is as follows:

Prehistoric Archaeological Resources Moderate to High

Historic Archaeological Resources Moderate to High

Historic Resources Low

Cultural Landscapes Unknown

Ethnic Resources Unknown

To ensure potential impacts to historical resources, as defined in §15064.5 of CEQA, are reduced to a

less than significant level the following mitigation measures shall be required:

CR-1: An archaeologist shall monitor all ground disturbing activities to: 1) identify and/or

recover any cultural resources uncovered during site development; and 2) ensure

protection of any uncovered historical or archaeological resources. The extent and

duration of the monitoring will be dependent upon the schedule for development

and at the discretion of the County.

CR-2: If any paleontological specimens are identified, a paleontological monitoring

program shall be considered for the remainder of the project activities. Any

proposed program shall follow the current guidelines set forth by the San

Bernardino County Museum.

d) Less than Significant with Mitigation: Construction activities, particularly grading, could adversely

affect or eliminate unknown potential archaeological resources or buried human remains. The following

mitigation measure shall be implemented:

CR-3: If, at any time, evidence of human remains are uncovered, the County Coroner shall

be notified immediately and permitted to examine the remains. If the remains are

determined to be of Native American origin, the Native American Heritage

Commission shall be notified and the Most Likely Descendent (MLD) shall be

identified. In consultation with the MLD and archaeological consultant, the

disposition of the remains shall be determined. If a definitive decision is not possible

through consultation, the Lead Agency shall have the authority to make a final

decision.


January 2014

25

Potentially

Significant

Impact

Less than

Significant

with

Mitigation

Incorp.

Less than

Significant

Impact

No

Impact

VI. GEOLOGY AND SOILS - Would the project:

a) Expose people or structures to potential substantial

adverse effects, including the risk of loss, injury, or

death involving:

i. Rupture of a known earthquake fault, as delineated

on the most recent Alquist-Priolo Earthquake Fault

Zoning Map Issued by the State Geologist for the

area or based on other substantial evidence of a

known fault? Refer to Division of Mines and

Geology Special Publication 42

ii. Strong seismic ground shaking?

iii. Seismic-related ground failure, including

liquefaction?

iv. Landslides?

b) Result in substantial soil erosion or the loss of topsoil?

c) Be located on a geologic unit or soil that is unstable, or

that would become unstable as a result of the project,

and potentially result in on or off site landslide, lateral

spreading, subsidence, liquefaction or collapse?

d) Be located on expansive soil, as defined in Table 181-B

of the California Building Code (2001) creating

substantial risks to life or property?

e) Have soils incapable of adequately supporting the use of

septic tanks or alternative wastewater disposal systems

where sewers are not available for the disposal of

wastewater?

SUBSTANTIATION:

a) i, ii) Less than Significant Impact. The Project Site is located on the San Bernardino North

Quadrangle California Division of Mines and Geology official map effective July 1, 1974. As identified

on the map, the Project Site is not located near a potentially active fault. The County of San Bernardino

General Plan Geologic Hazards Overlay Map (FH22 C) identifies a portion of Lake Gregory Regional

Park, including the location of proposed improvements on the west side of the lake, within a County

designated earthquake fault zone. Project activities within this area would include the enhancement of


January 2014

26

the existing Houston Creek West – West Debris Basin located adjacent to the library and construction of

a new approximately one acre basin, Houston Creek West – East Debris Basin on the lake side. Per the

San Bernardino County Development Code, the proposed facilities would be engineered to adequately

address all natural and manmade hazards including potential seismic impacts; thus less than significant

impacts are anticipated.

iii) Less than Significant Impact. Liquefaction occurs primarily in saturated, loose, fine to medium

grained soils. Shaking may cause soils meeting these conditions to lose strength and move as liquid.

Liquefaction-related effects may include loss of bearing strength, ground oscillations, lateral spreading,

and flow failures or slumping. The General Plan Geologic Hazards Overlay Map does not identify a

potential for liquefaction in the vicinity of the Proposed Project. However, the proposed project would

involve construction and sediment removal activities in areas with saturated soils. Vibrations associated

with construction equipment operating on saturated soils may result in localized liquefaction on the

footprint occupied by the construction equipment leading equipment to sink. In order to avoid potential

liquefaction in construction areas, the contractor would ensure that the equipment staging area is

sufficiently dry to allow for material excavation, or utilize rubber-wheeled equipment that is less

susceptible to liquefaction.

iv) No Impact. The General Plan Geologic Hazards Overlay Map (FH22 C) identifies generalized

landslide susceptibility in the project vicinity as low to moderate. The Hydrology and Debris Reduction

Study prepared by Albert A. Webb Associates identifies two major tributary watersheds into the lake:

1) Houston Creek West and 2) Houston Creek East. Houston Creek West watershed consists of an area

of approximately 415 acres of mixed use residential and commercial development. Houston Creek East

watershed consists of approximately 853 acres of residential and undeveloped natural areas. The

proposed activities would not significantly change site topography or result in unstable conditions, soil

erosion, or loss of soil. No impacts are anticipated.

b) No Impact. The purpose of the Proposed Project is to improve existing flood control facilities and

construct new debris and sedimentation basins to reduce sediment loads entering the lake. The proposed

facilities would improve the efficiency and effectiveness of an on-going maintenance plan for the

routine removal of accumulated sediment from the basin bottoms. The project is not anticipated to result

in impacts resulting from soil erosion or loss of topsoil.

c) No Impact. Construction of the proposed facilities would involve some land clearing, grading, and

excavation activities. The General Plan Geologic Hazards Overlay Plan does not identify a potential for

liquefaction in the project area. The proposed project is not anticipated to occur in unstable conditions

that would become unstable or result in landslide, lateral spreading, subsidence, liquefaction, or

collapse.

d) No Impact. Expansive soils (shrink-swell) are fine grained clay soils generally found in historical

floodplains and lakes. Expansive soils are subject to swelling and shrinkage in relation to the amount of

moisture present in the soil. Structures built on expansive soils may incur damage due to differential

settlement of the soil as expansion and contraction takes place. Information about shrink-swell classes

and linear extensibility is available in the Natural Resources Conservation Service (NRCS) soil survey

reports. The shrink-swell classification indicates the relative change in volume that may be expected

with changes in moisture contents, that is, the extent to which the soil shrinks as it dries out or swells

when it gets wet. The extent of shrinking and swelling is influenced by the amount and kind of clay in

the soil. A high shrink-swell potential indicates a hazard to maintenance of structures built in/on/or with

materials having this rating. Moderate to low ratings lessen the hazard.


January 2014

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Two soil complexes are identified by the NRCS to occur at the project site; oak glen family-riverwash at

the location of the existing west basin and morical-wind river families complex at all other project areas.

Morical-wind river families complex soils at the project site have a moderate shrink-swell classification

of 0.5; the NRCS does not report shrink-swell ratings for oak glen family-riverwash. The proposed

project does not involve construction of any habitable structures. The proposed facilities would consist

of earthen debris/sedimentation basins and an ephemeral channel. No impacts from expansive soils are

anticipated.

e) No Impact. The proposed project does not include a proposal for habitable structures that would

require a septic tank or connection to wastewater disposal systems. No impact would occur.

VII. GREENHOUSE GAS EMISSIONS - Would the

project:

Potentially

Significant

Impact

Less than

Significant

with

Mitigation

Incorp.

Less than

Significant

Impact

No

Impact

a) Generate greenhouse gas emissions, either directly or indirectly,

that may have a significant impact on the environment?

b) Conflict with an applicable plan, policy or regulation adopted

for the purpose of reducing the emissions of greenhouse gases?

SUBSTANTIATION:

Greenhouse Gas Emissions Interim Measures

According to CEQA Guidelines Section 15064.4, when making a determination of the significance of

greenhouse gas emissions, the “lead agency shall have discretion to determine, in the context of a particular

project, whether to (1) Use a model or methodology to quantify greenhouse gas emissions resulting from a

project, and which model or methodology to use.” Moreover, CEQA Guidelines section 15064.7(c) provides

that “a lead agency may consider thresholds of significance previously adopted or recommended by other public

agencies or recommended by experts provided the decision of the lead agency to adopt such thresholds is

supported by substantial evidence” and or (2) “Rely on qualitative analysis or performance based standards”.

The San Bernardino County GHG Reduction Plan (“GHG Plan”) presents a comprehensive set of actions to

reduce the County’s internal and external GHG emissions to 15% below current levels by 2020, consistent with

the AB 32 Scoping Plan. The County has adopted a GHG threshold of 3,000 CO2e for all development projects

under its jurisdiction. Carbon dioxide (CO2) is the most common GHG emitted by human activities, in terms of

the quantity released and the total impact on global warming. As a result the term “CO2” is sometimes used as

a shorthand expression for all greenhouse gases, however, this causes confusion, and therefore another way of

referring to a number of GHGs collectively is to use the term “carbon dioxide equivalent” or “CO2e”.

a/b) Less Than Significant Impact. The following analysis is based on the Governor’s Office of Planning

and Research, Technical Advisory on CEQA and Climate Change. Per CEQA guidelines, new project

emissions are treated as standard emissions, and air quality impacts are evaluated for significance on an

air basin or even at a neighborhood level. Greenhouse gas emissions are treated differently, in that the

perspective is global, not local. Therefore, emissions for certain types of projects might not necessarily

be considered as new emissions if the project is primarily population driven. Many gases make up the

group of pollutants that are believed to contribute to global climate change. However three gases are

currently evaluated: Carbon dioxide (CO2) Methane (CH4) and Nitrous oxide (N2O).


January 2014

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SCAQMD provides guidance methods and/or Emission Factors. Project GHG emissions are shown in

Table 2. GHG emissions were evaluated using the following: Off-Road Mobile Source Emissions

Factors (2014), Emission Factors for On-Road Heavy-Heavy Duty Diesel Trucks 2014, California

Climate Action Registry General Reporting Protocol, 2009I, and Table A9-8-C SCAQMD Handbook;

Climate Leaders EPA, Section 3, Table 2. The County GHG Threshold of 3,000 CO2e was used to

determine significance.

Table 2

Greenhouse Gas Emissions

Lake Gregory Restoration/Improvement

Lbs/day

Source CO2 CH3 N2O1

Water Truck 984 .06 0.0

Dozer 1,434 0.18 0.01

Loader 654 0.0 0.0

Excavators 720 0.0 0.0

Crane 774 0.0 0.0

Other Material Handling

Equipment

2,820 0.2 0.0

On-Road Street Legal Haul

Trucks1

4,368 0.0 0.0

Totals (lbs/per year) 1,410,480

MTCO2e per year 640.00

County Threshold 3,000

Significant No Note: Assumes a 120-day construction schedule.

Source: Off-Road Mobile Source Emissions Factors (2014);

Emission Factors for On-Road Heavy-Heavy Duty Diesel Trucks 2014

1 California Climate Action Registry General Reporting Protocol, 2009I;

Table A9-8-C SCAQMD Handbook; Climate Leaders EPA, Section 3, Table 2.

As shown in Table 2, GHG emissions are not anticipated to exceed the County GHG emissions

threshold. Therefore a less than significant impact is anticipated.

The project emissions are less than significant. However, the applicant will be required to implement

GHG reduction performance standards. The GHG reducing performance standards were developed by

the County to improve the energy efficiency, water conservation, vehicle trip reduction potential, and

other GHG reducing impacts from all new development approved within the unincorporated portions of

San Bernardino County. As such, the following Performance Standards establish the minimum level of

compliance that development must meet to assist in meeting the 2020 GHG reduction target identified in

the County GHG Emissions Reduction Plan. These Performance Standards apply to all Projects,

including those that emit less than 3,000 MTCO2e per year, and will be included as Conditions of

Approval for development projects.


January 2014

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The following Performance Standards are applicable to the Project:

1. The County and its construction contractor shall:

a) Select construction equipment based on low-GHG emissions factors and high-energy efficiency.

All diesel/gasoline-powered construction equipment shall be replaced, where possible, with

equivalent electric or CNG equipment.

b) All construction equipment engines shall be properly tuned and maintained in accordance with

the manufacturer’s specifications prior to arriving on-site and throughout construction duration.

c) All construction equipment (including electric generators) shall be shut off by work crews when

not in use and shall not idle for more than 5 minutes.

Potentially

Significant

Impact

Less than

Significant

with

Mitigation

Incorp.

Less than

Significant

Impact

No

Impact

VIII. HAZARDS AND HAZARDOUS MATERIALS -

Would the project:

a) Create a significant hazard to the public or the

environment through the routine transport, use, or

disposal of hazardous materials?

b) Create a significant hazard to the public or the

environment through reasonably foreseeable upset and

accident conditions involving the release of hazardous

materials into the environment?

c) Emit hazardous emissions or handle hazardous or acutely

hazardous materials, substances, or waste within one-

quarter mile of an existing or proposed school?

d) Be located on a site which is included on a list of

hazardous materials sites compiled pursuant to

Government Code Section 65962.5 and, as a result,

would it create a significant hazard to the public or the

environment?

e) For a project located within an airport land use plan or,

where such a plan has not been adopted, within two miles

of a public airport or public use airport, would the project

result in a safety hazard for people residing or working in

the project area?


January 2014

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Potentially

Significant

Impact

Less than

Significant

with

Mitigation

Incorp.

Less than

Significant

Impact

No

Impact

f)

For a project within the vicinity of a private airstrip,

would the project result in a safety hazard for people

residing or working in the project area?

g) Impair implementation of or physically interfere with an

adopted emergency response plan or emergency

evacuation plan?

h) Expose people or structures to a significant risk of loss,

injury or death involving wildland fires, including where

wildlands are adjacent to urbanized areas or where

residences are intermixed with wildlands?

SUBSTANTIATION:

a, b, c) No Impact. The Proposed Project involves improvements to and/or construction of three

debris/sedimentation basins, restoration of an ephemeral stream, and implementation of an on-going lake

maintenance program. Construction and operation of the Proposed Project would not involve hazardous

materials that may result in a significant hazard to the public or to the environment. No impacts are

anticipated.

d) No Impact. The Project Site is not located on a site which is included on the Cortese List as retrieved

on November 5, 2013 from the California EPA Cortese List Data Resources.

e, f) No Impact. The Project Site is not located within an airport influence area or within an airport

compatibility zone as identified in General Plan Hazards Map FH22 B. No private airstrips occur in the

vicinity of the Project Site. Implementation of the proposed project would not result in a safety hazard

related to an airport land use plan or resulting from the use of an airstrip in the immediate project area.

g) No Impact. The Crest Forest Community Plan Safety Chapter identifies the evacuation routes for the

community in the event of potential fire or other natural disaster events. The following roadways are

identified in the plan as designated evacuation routes: SR-138, SR-18, SR-189, Waters Drive, Crest

Forest Drive, Knapps Cutoff, Lake Gregory Drive, Arosa Drive, San Moritz Drive, North Road, and

Lake Drive. Lake Gregory Drive, Lake Drive, and San Moritz Drive are located in the immediate project

vicinity and all provide access to the Lake Gregory Regional Park recreation area. Per the Crest Forest

Community Plan, in the event of an emergency, specific evacuation routes would be designated during

an emergency in order to respond to the specific needs of the situation and circumstances surrounding

the disaster.

The Project Site is also located within the planning area for the Lake Gregory Dam Emergency Action

Plan (EAP). The purpose of the EAP is to reduce risk and loss of human life and injury, and to

minimize property damage in the event of an emergency situation associated with the Lake Gregory

Dam. Potential emergency situations as identified in the plan may include: dam instability, felt

earthquakes, extreme storm events, major spillway releases, overtopping of the dam, outlet system

failure, abnormal instrumental readings, vandalism or sabotage, spillway gate failures, or failure of the


January 2014

31

dam. The plan establishes guidelines that should be followed for identification of emergency situations

and action protocols in the event of an emergency.

The proposed project would be limited to the identified construction areas. During the construction

phase, no activities would infringe on or restrict access to the designated evacuation routes in the project

vicinity. Similarly, operation of the project would be limited to basin maintenance and sediment

removal activities that would not result in impacts to adjacent roadways. The Proposed Project would

not impair implementation of or physically interfere with an adopted emergency response plan or

emergency evacuation plan, thus no impacts would occur.

h) Less than Significant Impact. The Project Site is located within the Fire Safety Area 1 (FS1) Overlay

of the San Bernardino County General Plan Hazards Overlay Map FH22 B. Development within the

Fire Safety Overlay Area is guided by Chapter 82.13 of the County Development Code. The purpose of

the overlay is to provide greater public safety in areas prone to wildland brush fires, by establishing

additional development standards (Development Code Section 82.13.010). The FS1 overlay is

characterized by areas with moderate and steep terrain and moderate to heavy fuel loading contributing

to high fire hazard conditions. The Development Code requires that a notice of application or permit for

development in FS areas be sent to the responsible Fire Authority for comment. Additionally, all

development within FS areas must comply with development standards as outlined in Section 82.13.050

and 82.13.060 of the Development Code. Fire Authority Standards include compliance with standards

required by the Responsible Fire Authority and compliance with standards and provisions of the

California Building Code Chapter 7A (Materials and Construction Methods for Exterior Wildfire

Exposure).

The Project Site is located within the Crest Forest Fire Protection District. Lake Gregory Regional Park

is located within the service area of two of the District’s fire stations: 1) Lake Gregory Station #29, and

2) Crestline Station #25.

The Proposed Project would involve land clearing of approximately one acre of ponderosa pine forest

for construction of a debris/sediment basin. Approximately 12,300 cubic yards of sediment accumulated

in the southeast side of the lake would be removed from a 0.85 acre area (sand delta). General erosion

control requirements and runoff control measures as required by the Fire Safety Area Development

Standards would be implemented via the implementation of a Storm Water Pollution and Prevention

Program. Implementation of a SWPPP and notification to the Crest Forest Fire Protection District

would ensure that project impacts related to risk involving wildland fires would be less than significant.

Potentially

Significant

Impact

Less than

Significant

with

Mitigation

Incorp.

Less than

Significant

Impact

No

Impact

IX. HYDROLOGY AND WATER QUALITY - Would the

project:

a) Violate any water quality standards or waste discharge

requirements?


January 2014

32

Potentially

Significant

Impact

Less than

Significant

with

Mitigation

Incorp.

Less than

Significant

Impact

No

Impact

b) Substantially deplete groundwater supplies or interfere

substantially with groundwater recharge such that there

would be a net deficit in aquifer volume or a lowering of

the local groundwater table level (e.g., the production

rate of pre-existing nearby wells would drop to a level,

which would not support existing land uses or planned

uses for which permits have been granted)?

c) Substantially alter the existing drainage pattern of the site

or area, including through the alteration of the course of a

stream or river, in a manner that would result in

substantial erosion or siltation on- or off-site?

d) Substantially alter the existing drainage pattern of the site

or area, including through the alteration of the course of a

stream or river, or substantially increase the rate or

amount of surface runoff in a manner that would result in

flooding on- or off-site?

e) Create or contribute runoff water, which would exceed

the capacity of existing or planned storm water drainage

systems or provide substantial additional sources of

polluted runoff?

f) Otherwise substantially degrade water quality?

g) Place housing within a 100-year flood hazard area as

mapped on a Federal Flood Hazard Boundary or Flood

Insurance Rate Map or other flood hazard delineation

map?

h) Place within a 100-year flood hazard area structures that

would impede or redirect flood flows?

i) Expose people or structures to a significant risk of loss,

injury or death involving flooding, including flooding as

a result of the failure of a levee or dam?

j) Inundation by seiche, tsunami, or mudflow?


January 2014

33

SUBSTANTIATION:

a, f) Less than Significant Impact with Mitigation Incorporated. The Proposed Project involves

improvements to and/or construction of debris/sedimentation basins, restoration of an ephemeral stream,

and implementation of an on-going lake maintenance program. Proposed project activities would occur

in wetland, riparian, and stream areas identified to be under the jurisdiction of the California Department

of Fish and Wildlife (CDFW), the Army Corps of Engineers (USACE), and the Lahontan Regional

Water Quality Control Board (RWQCB) as identified within a Jurisdictional Delineation prepared for

the Lake Gregory Management & Bioretention Program (Lilburn Corporation 2013).

Implementation of the Proposed Project will require a Clean Water Act Section 401 Certification from

the Lahontan Regional Water Quality Control Board to ensure that the proposed project will not violate

State water quality standards. Implementation of the project would involve notification and procurement

of necessary permits and authorizations. Notification to the Lahontan RWQCB and coordination for

attainment of the necessary CWA 401 Certification would ensure that the Proposed Project would not

violate water quality standards or waste discharge requirements.

Per the requirements of the National Pollutant Discharge Elimination System (NPDES) the Project

contractor would be responsible for submitting to San Bernardino County, copies of the approved

General Construction Permit, including an approved Stormwater Pollution and Prevention Plan

(SWPPP). Best Management Practices (BMPs) to be implemented during project construction activities

would be outlined in the SWPPP. The implementation of BMPs would ensure that potential impacts to

water quality are effectively avoided or minimized.

HWQ-1: To avoid water quality impacts on Lake Gregory during the proposed sediment

removal activities a Storm Water Pollution Program shall be implemented for

sediment removal and stockpiling activities. The SWPPP must include a list of

BMPs to be implanted as part of the Project and a visual monitoring program to

ensure the effectiveness of the Plan.

HWQ-2: Excavation methods shall implement the use of a silt fence or terminal berm, as

practicable, to reduce impacts to water quality associated with turbidity.

HWQ-3: Sediment extraction from the lake shall occur only at the designated project areas.

If practicable, sediment removal activities shall be scheduled to occur during the

off-season dry months.

HWQ-4: To minimize water quality impacts associated with disturbance during removal of

sediment on the lake’s shoreline, the contractor shall create a berm barrier between

the lake and sediment stockpile in order to reduce any incidental drainage to the

lake.

b) No Impact. The Proposed Project involves improvements to and/or construction of debris/sedimentation

basins, restoration of an ephemeral stream, and implementation of an on-going lake maintenance

program. The purpose of the project is to restore the Lake Gregory surface area and lake bottom

elevation to the approximate 1995 status and to minimize sediment loads entering the lake by improving

an existing sediment basin and expanding debris/sediment control by constructing two new basins.

Construction and operation of the project would not involve utilization of groundwater resources. The

proposed project would allow for a reduction of silt in storm runoff and snow melt discharging from the


January 2014

34

Houston Creek West and East watersheds into Lake Gregory. The proposed basin and channel

improvements include soft bottom designs that would allow for runoff to percolate into the underground

aquifer. Implementation of the project would not deplete groundwater supplies or interfere with

groundwater recharge, thus no impacts would occur.

c) Less than Significant Impact. The purpose of the Proposed Project is to restore the Lake Gregory

surface area and lake bottom elevation to the approximately 1995 status and to minimize sediment loads

entering the lake by improving an existing sediment basin and expanding debris/sediment control by

constructing two new basins. Implementation of the Project would include improvements to/construction

of three debris/sedimentation basins, restoration of an ephemeral stream, and implementation of an on-

going lake maintenance program. A Hydrology and Debris Reduction Study prepared in 2013 modeled

existing sediment yield from two watersheds draining to Lake Gregory at the locations for the proposed

improvements. The study concluded that Houston Creek West yields approximately 700 cubic yards of

sediment per year and Houston Creek East yields approximately 1,380 cubic yards of sediment per year.

In order to reduce sediment loads entering the lake, Regional Parks proposes the construction of a series

of sedimentation basins to capture and remove sediment before it enters the lake. The project would

include improvements to the existing approximately 0.85-acre Houston Creek West – West Debris

Basin, construction of the new approximately one acre Houston Creek West – East Sediment Basin, and

construction of the new approximately 1.2-acre Houston Creek South Debris Basin. Additionally, an

approximately 900-foot linear channel would be reconstructed and re-contoured to restore storm flow

capacities. Implementation of the project would also include removal of accumulated sediment in the

eastern portion of the lake. Accumulation of sediment since the 1980’s has resulted in the creation of an

approximately 1.29-acre sand delta. As part of the proposed restoration activities, the southeast delta

would be reduced by approximately 0.85 acres (12,300 cubic yards), approximately 5,000 to 10,000

cubic yards of sediment would be removed from the northeast edge of the lake.

All improvements are proposed to occur within existing drainage patterns; the proposed project would

not impede or alter existing flow patterns. Implementation of the proposed project would allow for

future reduction of siltation by establishing a series of basins that would capture sediment loads prior to

entering the lake. Sediment would be removed from the basins on a routine basis as part of the on-going

maintenance plan.

d, e) No Impact. The Proposed Project includes the reconstruction and restoration of an approximately 900-

foot long ephemeral stream. Under existing conditions the channel is lined with concrete mats and the

channel capacity has been reduced due to ongoing silt accumulation. Restoration of the channel would

entail excavation of approximately 1,250 cubic yards of accumulated sediment and debris from within

the channel. Approximately 534 cubic yards of gabions, and 711 cubic yards of Reno mattress

reinforcement material would be placed on the side slopes to protect them from future erosion. The

channel would remain a soft-bottom channel. The proposed activities would occur in the existing

watercourse and the drainage pattern of the site would not be altered.

In the past, the existing channel has been reported to overtop resulting in flooding to adjacent baseball

fields. The last reported occurrence was in 2011 (personal communication, Phil Krause, November 1,

2013). The proposed improvements to the channel would restore the channel capacity and reduce the

potential for future flooding. Thus no impacts would occur.


January 2014

35

g, h) No Impact. The Project Site was researched in the Federal Management Agency Flood Insurance Rate

Maps. The site is located on Map Number 0671C9735H, revised on August 28, 2008

The limits of Lake Gregory are designated as Zone A. Zone A is defined as “areas with a 1% annual

chance of flooding and 26% chance of flooding over the life of a 30-year mortgage. No detailed analysis

are performed for these areas and depth of base flood elevations for this zone are not identified.

The west existing basin (next to the library) is located at the boundary of Zone A and Zone X (shaded).

Zone X (shaded) is defined as areas with a “0.2% annual chance of flood, areas of 1% annual chance of

flood with average depths of less than one foot, or drainage areas less than one square mile, and areas

protected by levees from 1% annual chance flood.”

The proposed basin and channel in the south project area are located in Zone X (unshaded). Zone X

(unshaded) is defined as outside of the 0.2% annual chance floodplain. These areas are characterized as

areas of minimal flood hazard and are usually depicted on Flood Insurance Rate Maps as above the

500-year flood level.

The Proposed Project would not place housing or place structures within the delineated floodplains that

would impede or redirect flows. Debris and sediment control basins are proposed to occur within the

existing drainage patterns including the Houston Creek West – West Debris/Sedimentation Basin and

the Houston Creek South ephemeral channel. The Houston Creek West – East Debris/Sedimentation

Basin is proposed within the existing surface area of the lake. The Houston Creek

South/Debris/Sedimentation Basin is proposed at the outlet of the Houston Creek South watershed

culvert into the ephemeral channel that discharges at the Lake. The proposed facilities would allow for a

reduction of sediment loads reaching the lake. No impacts associated with housing or structures in the

floodplain would occur.

i) No Impact. In recent years the California Department of Safety of Dams (DSOD) has raised seismic

stability concerns should a major seismic event occur near the Lake Gregory Dam. In cooperation with

DSOD, Regional Parks has conducted seismic stability analysis of the dam, including collection of core

samples, to determine what action is necessary to address existing concerns. However, improvements to

the Dam will be a separate project. The Proposed Project would not place housing or place structures

within the floodplain and would not expose people or structures to a significant risk associated with the

failure of a levee or dam. No impacts resulting from the Proposed Project would occur.

j) No Impact. Lake Gregory has an approximate surface area of 88 acres and a capacity of 2,100 acre-feet

of water at its spillway elevation of 4,517 feet above mean sea level. Seiche or inundation conditions at

the Lake have the potential to be triggered by strong winds, severe storm fronts, or earthquakes.

The Proposed project restores the approximately 1995 volume baseline conditions at the lake and would

not result in a change that would significantly impact the potential for inundation, seiche, tsunami, or

mudflow. No impacts would occur.


January 2014

36

Potentially

Significant

Impact

Less than

Significant

with

Mitigation

Incorp.

Less than

Significant

Impact

No

Impact

X. LAND USE AND PLANNING - Would the project:

a) Physically divide an established community?

b) Conflict with any applicable land use plan, policy, or

regulation of an agency with jurisdiction over the project

(including, but not limited to the general plan, specific

plan, local coastal program, or zoning ordinance) adopted

for the purpose of avoiding or mitigating an

environmental effect?

c) Conflict with any applicable habitat conservation plan or

natural community conservation plan?

SUBSTANTIATION:

a, b) No Impact. Development in the community of Crestline is guided by the Crest Forest Community Plan.

The primary purpose of the Crest Forest Community Plan is to guide the future use and development of

land within the plan area in a manner that preserves the character and independent identity of the

community.

The community plan states that “Lake Gregory is a community asset that contributes to the character and

quality of life in [the] community and that there is a need to enhance recreation facilities to meet the

needs of local residents and limited tourists” (Crest Forest Community Plan, pg. 13). Community

priorities identified in the plan include the expansion of recreation opportunities in trail systems and

open space areas located both on public and private lands for residents and visitors.

The Proposed Project is consistent with the Community Plan guidance that includes improvements to

and maintenance of existing recreational opportunities at Lake Gregory. Implementation of the

Proposed Project would result in a reduction of sediment loads entering the lake and allow Regional

Parks to implement on-going maintenance activities to baseline conditions as established by initial

project implementation. The project would not result in impacts that would divide the community of

Crestline or conflict with applicable land use policy as established in the County of San Bernardino

General Plan and in the Crest Forest Community Plan, thus no impacts would occur.

c) No Impact. The Project Site is not located within an existing or proposed habitat conservation plan or

within a natural Community Conservation Plan.


January 2014

37

Potentially

Significant

Impact

Less than

Significant

with

Mitigation

Incorp.

Less than

Significant

Impact

No

Impact

XI. MINERAL RESOURCES - Would the project:

a) Result in the loss of availability of a known mineral

resource that would be of value to the region and the

residents of the state?

b) Result in the loss of availability of a locally important

mineral resource recovery site delineated on a local

general plan, specific plan or other land use plan?

SUBSTANTIATION:

a, b) No Impact. Lake Gregory was identified on Plate 7.3 of Special Report 143 Mineral Land

Classification of the Greater Los Angeles Area. The lake is located outside of the San Bernardino

Production-Consumption Region and no Mineral Resource Zone designation is identified for the site.

Lake Gregory was formed by the completion of an earthen-type dam on Houston Creek in 1938. The

lake has been maintained for recreational purposes since then and the Lake Gregory Regional Park is

currently operated by the San Bernardino County Regional Parks Department. The Proposed Project

would result in the construction and improvement of park storm flow facilities for the purpose of

maintaining recreational opportunities available at the park. The proposed project would not change

existing land use conditions and would not result in impacts to mineral resources.

Potentially

Significant

Impact

Less than

Significant

with

Mitigation

Incorp.

Less than

Significant

Impact

No

Impact

XII. NOISE - Would the project:

a) Exposure of persons to or generation of noise levels in

excess of standards established in the local general plan

or noise ordinance, or applicable standards of other

agencies?

b) Exposure of persons to or generation of excessive

groundborne vibration or groundborne noise levels?

c) A substantial permanent increase in ambient noise levels

in the project vicinity above levels existing without the

project?

d) A substantial temporary or periodic increase in ambient

noise levels in the project vicinity above levels existing

without the project?


January 2014

38

Potentially

Significant

Impact

Less than

Significant

with

Mitigation

Incorp.

Less than

Significant

Impact

No

Impact

e) For a project located within an airport land use plan or,

where such a plan has not been adopted, within two

miles of a public airport or public use airport, would the

project expose people residing or working in the project

area to excessive noise levels?

f)

For a project within the vicinity of a private airstrip,

would the project expose people residing or working in

the project area to excessive noise levels?

a) Less than Significant Impact. The Crest Forest Community Plan defers noise policy to the San

Bernardino County General Plan Noise Element. Goals established in the General Plan for the Mountain

Areas aim to maintain the quiet environment of the mountain region. Applicable policies for the mountain

region address vehicular noise. Further policy regulating noise is established in the Development Code.

Per the Development Code, noise impacts generated by temporary construction, maintenance, repair, or

demolition activities between 7:00 a.m. and 7:00 p.m., except Sundays and Federal holidays, are exempt

from the regulation of the Development Code’s noise general performance standards (Section

83.01.080(g)(3)).

Construction of the Proposed Project would require the use of heavy machinery that may generate short-

term noise impacts in the construction area. Heavy equipment used for project construction may include

backhoes and excavators Subsequent operation of the debris and sediment detention basin would generate

some noise during clean up and maintenance activities.

As identified in the General Plan the major noise contributor in the project vicinity is vehicular noise.

Residential land uses on the perimeter park roads will not experience increased noise impacts from

vehicular traffic as a result of the proposed project. Short-term impacts associated with construction and

on-going maintenance activities may affect park patrons and residents on the immediate perimeter roads;

however, these activities would be limited as outlined in the County Noise Ordinance.

Per Section 83.01.080(g)(3) of the Development Code potential noise impacts resulting from

implementation of the Proposed Project are exempt from the regulations of the Development Code

performance standards during both the construction and maintenance implementation phases.

Implementation of the project would result in less than significant impacts.

b) No Impact. Construction of the proposed debris and sediment control basins, and improvements to the

ephemeral channel, would require grading and excavation activities utilizing heavy machinery. Neither the

proposed construction-phase nor on-going maintenance activities are anticipated to result in the generation

of excessive groundborne vibration or groundborne noise levels.

c, d) Less than Significant Impact. Construction of the Proposed Project would require the use of heavy

machinery that may generate short-term noise impacts in the construction area. Heavy equipment used for

project construction may include backhoes and excavators. Subsequent operation of the debris and sediment

detention basin would generate some noise during on-going maintenance activities. Ambient noise levels in

the immediate project vicinity would increase above levels existing without the project only during the


January 2014

39

construction phase. Noise levels associated with maintenance activities would occur periodically. Noise

generated by the construction and maintenance activities is exempt from the performance standards of the

Development Code. Less than significant impacts are anticipated.

e, f) No Impact. The Project Site is not located within an airport influence area or within an airport


vicinity of the Project Site. The nearest airstrip is located at the Lake Arrowhead Airport approximately

seven miles northeast of the project site. Implementation of the proposed project would not result in a

safety hazard related to an airport land use plan or resulting from the use of an airstrip in the immediate

project area. The Proposed Project would not expose people residing or working in the project area to

excessive noise levels.

Potentially

Significant

Impact

Less than

Significant

with

Mitigation

Incorp.

Less than

Significant

Impact

No

Impact

XIII. POPULATION AND HOUSING - Would the project:

a) Induce substantial population growth in an area, either

directly (for example, by proposing new homes and

businesses) or indirectly (for example, through extension

of roads or other infrastructure)?

b) Displace substantial numbers of existing housing,

necessitating the construction of replacement housing

elsewhere?

c) Displace substantial numbers of people, necessitating the

construction of replacement housing elsewhere?

SUBSTANTIATION:

a, b, c) No Impact. Implementation of the proposed project would involve improvements to and/or construction

of debris/sediment basins, restoration of an ephemeral stream, and implementation of an on-going lake

maintenance program. The purpose of the project is to restore the Lake Gregory surface area and lake

bottom elevation to the approximately 1995 status and to minimize sediment loads entering the lake.

The project would benefit fishery resources at the lake, increase the lake area available for water

recreation, and improve water quality. Related construction activities would be short-term and would

not provide long-term employment that would require people to move to the area. The project would

not directly or indirectly, induce population growth in the area nor would it displace existing houses or

structures. The Proposed Project would have no impacts on population or housing in the area.


January 2014

40

Potentially

Significant

Impact

Less than

Significant

with

Mitigation

Incorp.

Less than

Significant

Impact

No

Impact

XIV. PUBLIC SERVICES

a) Would the project result in substantial adverse physical

impacts associated with the provision of new or physically

altered governmental facilities, need for new or physically

altered governmental facilities, the construction of which

could cause significant environmental impacts, in order to

maintain acceptable service ratios, response times or other

performance objectives for any of the public services:

Fire Protection?

Police Protection?

Schools?

Parks?

Other Public Facilities?

SUBSTANTIATION:

a)

Fire Protection: No Impact. The Project Site is located within the Crest Forest Fire Protection District.

Lake Gregory Regional Park is located within the service area of two of the District’s fire

stations: 1) Lake Gregory Station #29, and 2) Crestline Station #25. Implementation of

the proposed project would not create an additional demand for fire protection resources

or create conditions that would result in inadequate fire protection. No impacts are

anticipated.

Police Protection: No Impact. The Proposed Project would not require police protection, would not

necessitate the construction of new police protection facilities, and would not increase

demand on police protection services or result in extended response times for police

protection services. No impacts are anticipated.

Schools: No Impact. The Proposed Project would not require school services or necessitate the

construction of new school facilities, or alter enrollment. No impacts are anticipated.

Parks: Less than Significant Impact. Construction of the proposed Houston Creek West – East

basin would occur in an area that has historically been the inlet area for Houston Creek

West into the lake. The basin development would entail creation of a raised basin

designed to capture excess sediment flows from the Houston Creek West – West Basin in

an area currently available to park patrons. However, construction of the basin would

result in long term beneficial impacts including improved water quality and reduced

sedimentation in the lake. Additionally, temporary impacts to an area of the park used

for recreational fishing would occur during excavation of the delta in Project Area 4.


January 2014

41

This excavation would restore approximately 0.85 acres of lake habitat lost due to

sediment accumulation since the mid 1980’s.

The Proposed Project is the improvement and construction of storm flow facilities at

Lake Gregory Regional Park. Implementation of the proposed project would reduce the

sediment loads entering the lake and provide on-going maintenance of the lake and its

tributary basins and channel facilities. Lake Gregory serves primarily residents of the

community of Crestline and tourists. The proposed park improvements would not

significantly change the number of park patrons or create a demand for additional

recreation lands. Less than significant impacts are anticipated to occur.

Other Public No Impact. No existing public service facilities are located at the site or serve it, and the

proposed project would not involve the introduction of a temporary or permanent human

population into this area. Based on these factors, the proposed project would not result in

any long-term impacts to other public facilities.

Potentially

Significant

Impact

Less than

Significant

with

Mitigation

Incorp.

Less than

Significant

Impact

No

Impact

XV. RECREATION

a) Would the project increase the use of existing

neighborhood and regional parks or other recreational

facilities such that substantial physical deterioration of

the facility would occur or be accelerated?

b) Does the project include recreational facilities or require

the construction or expansion of recreational facilities,

which might have an adverse physical effect on the

environment?

SUBSTANTIATION:

a) No Impact. The proposed park improvements at Lake Gregory Regional Park would not substantially

increase park patrons or lead to a substantial physical deterioration of park facilities. No impacts to the

Park or its facilities are anticipated.

b) Less than Significant Impact. The Proposed Project is the improvement and construction of storm flow

facilities at Lake Gregory Regional Park. Implementation of the proposed project would reduce the

sediment loads entering the lake and provide on-going maintenance of the lake and its tributary basins

and channel facilities.

Construction of the proposed Houston Creek West – East basin would occur in an area that has

historically been the inlet area for Houston Creek West into the lake. The basin development would

entail creation of a raised basin designed to capture excess sediment flows from the Houston Creek West

– West Basin in an area currently available to park patrons. However, construction of the basin would

result in long term beneficial impacts including improved water quality and reduced sedimentation in the

lake. Additionally, temporary impacts to an area of the park used for recreational fishing would occur


January 2014

42

during excavation of the delta in Project Area 4. This excavation would restore approximately 0.85

acres of lake habitat lost due to sediment accumulation since the mid 1980’s. Implementation of the

overall project, would reduce sediment loads that have historically entered the lake and reduced the lake

volume and surface area by establishing baseline conditions (approximately 1995 lake surface area) and

implementing an on-going maintenance program to maintain baseline conditions in the future. Less than

significant impacts to recreation resources are anticipated.

Potentially

Significant

Impact

Less than

Significant

with

Mitigation

Incorp.

Less than

Significant

Impact

No

Impact

XVI. TRANSPORTATION/TRAFFIC - Would the project:

a) Cause an increase in traffic, which is substantial in

relation to the existing traffic load and capacity of the

street system (i.e., result in a substantial increase in either

the number of vehicle trips, the volume to capacity ratio

on roads, or congestion at intersections)?

b) Exceed, either individually or cumulatively, a level of

service standard established by the county congestion

management agency for designated roads or highways?

c) Result in a change in air traffic patterns, including either

an increase in traffic levels or a change in location that

results in substantial safety risks?

d) Substantially increase hazards due to a design feature

(e.g., sharp curves or dangerous intersections) or

incompatible uses (e.g., farm equipment)?

e) Result in inadequate emergency access?

f) Result in inadequate parking capacity?

g) Conflict with adopted policies, plans, or programs

supporting alternative transportation (e.g., bus turnouts,

bicycle racks)?

SUBSTANTIATION:

a, b) Less than Significant Impact. Access to Lake Gregory’s park lands is available at various access

points along Lake Gregory Drive, Lake Drive, and San Moritz Drive. Lake Drive is identified in the

Crest Forest Community Plan as a two-lane mountain secondary highway that extends eastward from

State Route 138 along the northern shore of Lake Gregory before becoming Arosa Drive at an

intersection with San Moritz Drive just east of the lake. Lake Gregory Drive is a two-lane mountain

major highway that begins at an intersection with Lake Drive just west of Lake Gregory and continues


January 2014

43

southeasterly before terminating at an intersection with State Route 189. San Moritz Drive is a two-lane

mountain secondary highway that originates immediately west of Lake Gregory at an intersection with

Lake Gregory Drive and continues along the southern shore until terminating at an intersection Lake

Drive immediately east of the lake.

The Crest Forest Community Plan provides Level of Service (LOS) scores for the roadways providing

access to the park based on average daily trip data to generally describe the operation of roadways

throughout the day. In the vicinity of the lake, Lake Drive is reported to operate at LOS B, Lake

Gregory Drive is reported to operate at LOS B, and San Moritz Drive is reported to operate at LOS A.

Roadways operating at LOS A are described as having a free flow traffic condition where drivers can

maintain their desired speeds with little or no delay and are unaffected by other vehicles. Roadways

operating at LOS B are described as having near to reasonably free-flow traffic conditions with reduced

maneuverability and limits to speed selection. Per the policies and goals of the Community Plan

development proposals should not degrade LOS on major arterials below LOS C during non-peak hours

or below D during peak hours.

Implementation of the proposed project would result in a temporary increase in traffic during

construction activities and exporting dredged material from the lake and basins. The project would not

result in the creation of new recreational facilities and is not anticipated to generate new park patrons.

Therefore, no impacts to the existing roadways that would be defined as significant per the policies of

the Community Plan are anticipated.

c) No Impact. The Project Site is not located within an airport influence area or within an airport


vicinity of the Project Site; the nearest is located at the Lake Arrowhead airport approximately seven

miles northeast of the project site. The airport website reports that the airport is currently closed until

further notice (web site as of 12-18-2013). Implementation of the proposed project would not result in a

safety hazard related to an airport land use plan or resulting from the use of an airstrip in the immediate

project area. The Proposed Project would not result in a change in the existing air traffic patterns,

including either an increase in traffic levels or a change in location that would result in substantial safety

risks.

d, e) No Impact. The proposed project improvements to reduce siltation entering the lake and on-going

maintenance program would not result in changes to internal or external park circulation. Access to the

park would not be changed by implementation of the proposed project. No impacts to circulation

system or access would occur.

f) Less Than Significant Impact. Implementation of the Proposed Project is not anticipated to increase

visitors to the regional park as the proposed improvements are not considered attractions. Parking at the

regional park is available at four surface lots located along the perimeter of the lake. Construction of the

proposed Houston Creek South debris/sediment basin will eliminate approximately 1/3 of an acre

currently developed as a parking lot north of San Moritz Drive. Development of this basin would result

in the elimination of approximately 16 parking spaces primarily used by visitors to the San Moritz

Lodge, which is predominantly used in the evening and occasional weekends. Ample parking exists

within the regional park’s four surface parking lots to accommodate existing park users. The elimination

of approximately 16 parking spaces would not significantly impact the available parking inventory at

Lake Gregory Regional Park, thus a less than significant impact is anticipated.


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g) Less than Significant Impact. Recreational opportunities available at Lake Gregory Regional Park

include walking and bicycle trails throughout the developed park area. Additionally there is a designated

walking trail built by the County Department of Public Works as part of the Safe Routes to School

Program in Project Area 3. Per the Crest Forest Community Plan, the guiding policy is to establish and

coordinate a system of pedestrian and bicycle trails that connect residential areas, schools, recreation

facilities, the National Forest, and commercial activities especially in the Downtown/Lake Gregory area.

Construction of the approximately 1.2-acre Houston Creek South Debris Basin north of San Moritz

Drive in the southeast project area would result in temporary impacts to the Safe Routes to School trail.

During construction activities access to the route may be limited or routed around the construction area.

Impacts would be temporary and access to the route would be restored upon completion of construction

activities. Implementation of the proposed project would have less than significant impact on pedestrian

and bicycle trails used for alternative transportation.

Potentially

Significant

Impact

Less than

Significant

with

Mitigation

Incorp.

Less than

Significant

Impact

No

Impact

XVII. UTILITIES AND SERVICE SYSTEMS - Would the

project:

a) Exceed wastewater treatment requirements of the

applicable Regional Water Quality Control Board?

b) Require or result in the construction of new water or

wastewater treatment facilities or expansion of existing

facilities, the construction of which could cause

significant environmental effects?

c) Require or result in the construction of new storm water

drainage facilities or expansion of existing facilities, the

construction of which could cause significant

environmental effects?

d) Have sufficient water supplies available to serve the

project from existing entitlements and resources, or are

new or expanded entitlements needed?

e) Result in a determination by the wastewater treatment

provider, which serves or may serve the project that it has

adequate capacity to serve the project's projected demand

in addition to the provider's existing commitments?

f) Be served by a landfill(s) with sufficient permitted

capacity to accommodate the project's solid waste

disposal needs?


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Potentially

Significant

Impact

Less than

Significant

with

Mitigation

Incorp.

Less than

Significant

Impact

No

Impact

g) Comply with federal, state, and local statutes and

regulations related to solid waste?

SUBSTANTIATION:

a, b) No Impact. The Proposed Project would not have an impact on the existing wastewater services in the

area. Operation of the project does not require wastewater treatment facilities and therefore would not

require construction of new or expanded wastewater treatment facilities that would result in significant

environmental effects. No impacts are anticipated.

c) Less than Significant Impact. Implementation of the Proposed Project would involve improvements to

and/or construction of three debris/sediment basin, restoration of an ephemeral stream, and

implementation of an on-going lake maintenance program. The design for the proposed basin was made

following extensive evaluation of the Lake Gregory hydrological regime in a Hydrology and Debris

Reduction Study prepared in 2013. The Study modeled existing sediment yield from two watershed

draining to Lake Gregory at the locations for the proposed improvements. The study concluded that

Houston Creek West yields approximately 700 cubic yards of sediment per year; Houston Creek East

yields approximately 1,380 cubic yards of sediment per year. Implementation of the Proposed Project

will minimize these sediments from entering the lake. Construction of the three debris/sediment basins,

restoration of an ephemeral stream, and implementation of an on-going lake maintenance program will

not create a need for additional stormwater facilities beyond those proposed as part of the project;

therefore, impacts will be less than significant.

d, e) No Impact. The Proposed Project would not impact the available water supply. The proposed

stormwater facility enhancements would not increase the Park’s water demand or result in inadequte

capacity by the water supply provider to serve the project area. No impacts to water supply or

wastewater treatment facility capacities would occur.

f) No Impact. Material removed from the existing basin bottoms and from the lake as part of the sediment

removal activities would initially be stockpiled on-site at a desgnated upland location in accordance with

Best Management Practicies listed in the project’s SWPPP. A sufficient amount of material necessary

for construction of the proposed improvements in the basins and channel would be kept on-site. Any

additional material would be transported to the San Bernardino County Special Districts Department

designated stockpile site for the Lake Gregory Dam Project. The stockpile site is located at the

Thousand Pines Camp site located approximately one mile from the Lake Gregory park site.

Vegetation and trees removed as part of the earthwork activities may be chipped/mulched on-site and

placed on the finished basin slopes for habitat restoration purposes if deemed appropriate by the

regulatory agencies. Alternatively mulch material may be offered to the local community at a “free

mulch day.” Trees may also be felled, cut, split, and repourposed on-site. Vegetation material that is not

chipped/mulched and disposed of on-site would be transferred to the County’s Heaps Peak transfer

station located approximately 12 miles from the Lake Gregory Park site.


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Potentially

Significant

Impact

Less than

Significant

with

Mitigation

Incorp.

Less than

Significant

Impact

No

Impact

XVIII. MANDATORY FINDINGS OF SIGNIFICANCE:

a) Does the project have the potential to degrade the quality

of the environment, substantially reduce the habitat of a

fish or wildlife species, cause a fish or wildlife population

to drop below self-sustaining levels, threaten to eliminate

a plant or animal community, reduce the number or

restrict the range of a rare or endangered plant or animal

or eliminate important examples of the major periods of

California history or prehistory?

b) Does the project have impacts that are individually

limited, but cumulatively considerable? (“Cumulatively

considerable” means that the incremental effects of a

project are considerable when viewed in connection with

the effects of past projects, the effects of other current

projects, and the effects of probable future projects)?

c) Does the project have environmental effects, which will

cause Substantial adverse effects on human beings, either

directly Or indirectly?

a) Less than Significant with Mitigation Incorporated: The Proposed Project includes improvements to

and/or construction of three debris/sediment basin, restoration of an ephemeral stream, and

implementation of an on-going lake maintenance program. Analysis of the potential environmental

impacts indicates potentially significant impacts to Biology, Cultural Resources, and Hydrology/Water

Quality. However, these potentially significant impacts can be reduced through mitigation to levels less

than significant.

Because these potential impacts can be mitigated to a less than significant level, the proposed project

will not degrade the quality of the environment, substantially reduce the habitat of a fish or wildlife

species, cause a fish or wildlife population to drop below self-sustaining levels, threaten to eliminate a

plant or animal community, reduce the number or restrict the range of a rare or endangered plant or

animal or eliminate important examples of the major periods of California history or prehistory.

b) Less than Significant Impact: Impacts associated with the proposed project would not be considered

cumulatively adverse or unfavorable. The project is not anticipated to generate significant amounts of air

pollutants, traffic or noise. Cumulative impacts to biological or cultural resources are also not

anticipated to be significant. In addition, mitigation measures are incorporated that would reduce all

impacts to less than significant level. No significant cumulative adverse impacts are anticipated

c) Less than Significant Impact: The Proposed Project would not cause substantial long-term adverse

effects on human beings, either directly or indirectly. Construction activities would temporarily increase

ambient noise levels for the surrounding area. However, the County’s noise regulations excludes

impacts generated by temporary construction, maintenance, repair, or demolition activities between


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47

7:00 a.m. and 7:00 p.m., except Sundays and Federal holidays. Adhering to the County’s noise

ordinance would ensure impacts from construction would be less than significant. The proposed project

would not be used for storing any toxic or hazardous materials nor does the construction and operation

of the project involves such a use. Any direct or indirect impacts to human beings would therefore, be

mitigated.


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XIX MITGATION MEASURES.

(Any mitigation measures which are not ‘self-monitoring’ shall have a Mitigation Monitoring and Reporting

Program prepared and adopted at the time of project approval)

BIO-1: Vegetation removal associated with the development of the proposed basin facilities,

channel, and lake sediment removal shall be scheduled to occur outside of the bird nesting

season (March – September). Should vegetation removal occur during the nesting season a

nest clearance survey shall be conducted no more than 30 days prior to removal of

vegetation/trees and the vegetation removal shall be monitored by a qualified biologist.

BIO-2: Limits of construction shall be identified and marked in the field prior to initiation of

sediment removal activities and basin and channel construction activities. No extraction of

accumulated sediment or construction activities, other than in the designated areas shall

occur.

BIO-3: All excavated sediment shall be deposited in an upland area where it will not be subject to

re-depositing in surface waters.

BIO-4: All construction equipment must be clean and free from oil, grease and loose metal

material, and must be removed from service if necessary to protect water quality.

BIO-5: Construction equipment staging/storage shall occur in a designated upland area.

BIO-6: The County will ensure that its Contractor employs necessary measures to prevent

sediment discharge to surface waters and to prevent the introduction or spread of

noxious/invasive weeds within the project and staging area.

BIO-7: All litter shall be removed from the construction area and disposed of in an appropriate

manner at the end of each construction day to ensure that no litter enters riparian areas or

jurisdictional waters.

BIO-8: Access and topography at the 13 outlets with proposed ongoing maintenance varies by

location, therefore, excavation methods would be site-specific at each of the outlet locations.

Maintenance sediment removal at the outlet locations shall occur under the following

conditions: 1) all sediment removal shall be completed by mechanical means including

wheeled and tracked vehicles when necessary with equipment located above the lake’s

OHWM, 2) equipment access areas will be marked to define the work area and minimize

impacts to adjacent habitat to the greatest extent practicable, and 3) outlet pipe repair and

maintenance, as necessary, shall be scheduled during the off-season.

BIO-9: The applicant shall provide compensatory mitigation for unavoidable permanent impacts

to riparian and wetland habitat at a minimum 1:1.5 ratio. Compensatory mitigation may

include restoration or creation of habitat as agreed to by the Applicant and regulatory

agencies.

BIO-10: Sediment removal within the lake shall be timed to avoid the fish spawning season which is

generally March through July.


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CR-1: An archaeologist shall monitor all ground disturbing activities to: 1) identify and/or

recover cultural resources uncovered during site development; and 2) ensure protection of

resources. The extent and duration of the monitoring will be dependent upon the schedule

for development; the grading permit specifications; and at the discretion of the County.

CR-2: If any paleontological specimens are identified, a paleontological monitoring program shall

be considered for the remainder of the project activities. Any proposed program shall

follow the current guidelines set forth by the San Bernardino County Museum

CR-3: If, at any time, evidence of human remains are uncovered, the County Coroner shall be

notified immediately and permitted to examine the remains. If the remains are determined

to be of Native American origin, the Native American Heritage Commission shall be

notified and the Most Likely Descendent (MLD) shall be identified. In consultation with

the MLD and archaeological consultant, the disposition of the remains shall be determined.

If a definitive decision is not possible through consultation, the Lead Agency shall have the

authority to make a final decision.

HWQ-1: To avoid water quality impacts on Lake Gregory during the proposed sediment removal

activities a Storm Water Pollution Program shall be implemented for sediment removal

and stockpiling activities. The SWPPP must include a list of BMPs to be implanted as part

of the Project and a visual monitoring program to ensure the effectiveness of the Plan.

HWQ-2: Excavation methods shall implement the use of a silt fence or terminal berm, as

practicable, to reduce impacts to water quality associated with turbidity.

HWQ-3: Sediment extraction from the lake shall occur only at the designated project areas. If

practicable, sediment removal activities shall be scheduled to occur during the off-season

dry months.

HWQ-4: To minimize water quality impacts associated with disturbance during removal of sediment

on the lake’s shoreline, the contractor shall create a berm barrier between the lake and

sediment stockpile in order to reduce any incidental drainage to the lake.


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GENERAL REFERENCES

California Department of Conservation, Division of Mines and Geology. 1987. Mineral Land Classification of

the Greater Los Angeles Area Special Report 143 Part VII.

California Department of Conservation, Farmland Mapping and Monitoring Program. San Bernardino County

Important Farmland 2012: Sheet 2 of 2. Published December 2011.

California Environmental Protection Agency. Cortese List Data Resources. Retrieved November 5, 2013.

California Regional Water Quality Control Board – Lahontan Region. December 2005. Water Quality Control

Plan for the Lahontan Region North and South Basins.

County of San Bernardino. 2007. Crest Forest Community Plan.

County of San Bernardino 2007 Development Code. Amended July 25, 2013.

County of San Bernardino. 2011. Emergency Action Plan (EAP) for Lake Gregory Dam No. 1803-003, NID#

CA00224.

County of San Bernardino General Plan, March 2007.

CEQA Guidelines, Appendix G

State of California Department of Conservation, 2009 Important Farmlands Maps for the County of San

Bernardino.

Lilburn Corporation. 2014. Biological Resources Assessment for Lake Gregory Sediment Management and

Bioretention Program. Prepared for County of San Bernardino Regional Parks Department.

Lilburn Corporation. 2014. Jurisdictional Delineation for Lake Gregory Sediment Management and

Bioretention Program. Prepared for County of San Bernardino Regional Parks Department.

United States Department of Agriculture, Natural Resources Conservation Service. Custom Soil Resource

Report for San Bernardino National Forest Area, California (Lake Gregory Siltation Management

Project). Retrieved from Web Soil Survey, September 19, 2012.

2002 Initial Study DRAFT - San Bernardino Countycms.sbcounty.gov/Portals/1/Newsfeeds/Management...

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