HomeMy WebLinkAboutSan Sevaine Channel Flood Control System LOWER SAN SEVAINE BASIN
SAN_SEIAINE CHANNEL FLOOD CONTROL SYSTEM
PRELIMINARY DESIGN
AND
ENVIRONMENTAL REVIEW ANALYSIS
CITY OF RANCHO CUCAMONGA
COUNTY OF SAN BERNARDINO
Prepared by
Bill Mann & Associates, Inc.
1814 Commercenter West, Suite A
San Bernardino, CA 92404
April, 1987
TABLE OF CONTENTS
Page
SECTION I. INTRODUCTION 1
SECTION II. PROPOSED PROJECT 3
A. PROJECT DESCRIPTION 3
B. DAY, ETIWANDA AND SAN SEVAINE CREEKS 4
SYSTEM DRAINAGE PLAN
C. SAN SEVAINE CREEK WATER PROJECT 5
D. HYDROLOGY 5
E. PRELIMINARY DESIGN OF THE BASIN 6
F. SOILS AND GEOLOGY 8
SECTION III. ENVIRONMENTAL SETTING AND FINAL ENVIRONMENTAL 10
ASSESSMENTS AND REPORTS
A. ENVIRONMENTAL SETTING 10
B. PRIOR ENVIRONMENTAL ASSESSMENTS AND REPORTS 10
C. SOCIAL IMPACTS 12
SECTION IV. REFERENCES 16
APPENDIX 1. SAN SEVAINE CREEK WATER PROJECT - ENVIRONMENTAL ASSESSMENT -
PROPOSED MITIGATION MEASURES
i
SECTION I. INTRODUCTION
This report is proposed to develop the preliminary design plans and environ-
mental review analysis for the Lower San Sevaine Basin located in the City of
Rancho Cucamonga. The proposed basin is a vital part of the San Sevaine Creek
Channel System, the regional flood control and water conservation system pro-
viding protection, and a drainage outlet for the Cities of Fontana, Rancho
Cucamonga and Ontario, and the Counties of San Bernardino and Riverside.
The proposed basin is located in northeastern Rancho Cucamonga immediately
north of the Devore Freeway and easterly of the community of Etiwanda. The
proposed basin and immediate area around the basin is shown on Figure No. I,
Vicinity Map.
The proposed basin is planned to be a flood flow storage basin regulating
flows from the upper San Sevaine Creek tributary system. The flood flow
storage will allow the downsizing of flood control channels from the basin
southerly to the Santa Ana River. The San Sevaine Channel System Drainage
Plan and Hydrology Report is discussed in Sections II,B and D.
The County of San Bernardino in conjunction with the Cities of Fontana, Rancho
Cucamonga and Ontario, has applied for a low - interest loan from the U. S.
Bureau of Reclamation. The funding for the "San Sevaine Creek Water Project"
is being sought under the Bureau of Reclamation's Small Reclamation Projects
Act of 1956. The Loan Application Report and Environmental Assessment have
been prepared by the firms of Engineering- Science, Inc., and Bill Mann &
Associates, Inc. The Lower San Sevaine Basin is a major water conservation
element of the "San Sevaine Creek Water Project" to increase the percolation
to the underground Chino Basin. The proposed Bureau of Reclamation project
includes the major portions of the San Sevaine Channel System regional flood
control project. The Bureau project is discussed in Section II,C.
1
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Several environmental assessments and environmental impact reports have been
prepared for the regional flood control and water conservation system. The
prior reports are discussed in Section III,B.
At the present time, in addition to the request for partial funding for the
San Sevaine Creek Water Project through the Bureau of Reclamation, the County
of San Bernardino and City of Fontana are presently reviewing other funding
sources for construction of the overall flood control and water conservation
project. Because of the necessity of new development in the area to mitigate
the increased runoff that will be generated by development, an effort is being
made to provide the mitigation by increasing the storage volume in existing
water conservation basins or by developing new basins. The expansion of the
Lower San Sevaine Basin is one of the major basins that is programmed for the
mitigation of the increased drainage runoff. The excavation of the basin not
only will support new development, it will at the same time provide a major
element of the regional flood control system at a reduced cost.
The proposed basin will provide a 2,350 acre -foot flood storage facility
requiring a levee approximately 10 to 40 feet in height and approximately
2,130,000 cubic yards of excavation. Approximately 1,300,000 cubic yards of
the excavated material will be placed in the levee.
Although the overall flood control drainage plan has had prior environmental
reports prepared, an additional environmental assessment has been recommended
due to the height of the levee. The preliminary design and plan is necessary
to provide the required data for environmental review. Therefore, this report
has a dual purpose, to provide a preliminary design document for review by the
cognizant agencies and to provide the format for a determination on environ-
mental concern and significance.
2
SECTION II. PROPOSED PROJECT
A. Project Description
The proposed project as far as this report is concerned is the excavation,
levee placement and construction of the concrete spillway, ungated 10'x 8'
RCB basin outlet, 48 -inch RCP Etiwanda Channel turnout, and 36 -inch RCP basin
drain for the Lower San Sevaine Basin.
Figure No. II, Sheets 1 thru 3, are reduced sheets of the preliminary plan and
cross - sections for the basin.
Following are the major pertinent construction features of the project:
Basin excavation = 2,130,000+ yd3
Fill required for levee = 1,300,000+ yd3
Estimated Cost = $5,725,000
The height of the south levee of the basin will vary from 10 to 40 feet above
existing terrain. Due to the higher existing ground along the north side of
the basin, the height of the north levee will vary from 0 to approximately 10
feet above the existing terrain.
There is an existing elongated basin on the site at the present time. The
existing basin is approximately 250 feet wide and 20+ to 30 feet deep. The
existing basin will be widened to an approximate maximum width of 950 feet.
The basin excavation, along with the levee construction, will provide the
necessary storage volume of 2,350 acre -feet.
Due to the need to minimize the amount of excavated material that will have to
be hauled away from the site, the proposed levee has been designed with a
wider top width and flatter slopes than may be necessary. Due to the expense
of disposing of any excess excavated material, it is proposed to place as much
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of the material as possible in the levee. The proposed levee, based on the
preliminary design, will have a 30 -foot top width and 3:1 side slopes.
A spillway approximately 200 feet in width is proposed to pass a major flood
without topping the levee.
The design criteria for the preliminary plan is discussed in Section II,E.
The environmental setting for the site is discussed in Section III,A. The
estimated cost of $5,725,000 can be reduced significantly if the major part of
the excavation can be removed through the development process.
B. Day, Etiwanda and San Sevaine Creeks System Drainage Plan
The proposed Lower San Sevaine Basin is a part of the San Sevaine Creek
Drainage System. A master plan was prepared for the Day, Etiwanda and San
Sevaine Creeks System in 1983 by Bill Mann & Associates. The major elements
of the master plan were the Day, Etiwanda and San Sevaine Creek Channels. The
San Sevaine Creek Drainage System comprises the easterly portion of the master
plan drainage area. The Day, Etiwanda and San Sevaine Creeks System Drainage
Plan is shown on Figure No. III.
The drainage master plan development was a joint effort by the Cities of
Rancho Cucamonga, Fontana and Ontario, and the Counties of San Bernardino and
Riverside. The drainage plan was accepted by all the agencies involved in
1983.
Lower San Sevaine Basin serves two purposes as an element of the drainage
plan. Because of inadequate, existing, improved flood channels in Ontario and
Riverside County and the need to downsize the proposed channels southerly of
the basin, the basin was designed as a flood flow storage basin. Addi-
tionally, the drainage plan included a "Water Conservation Report ". The water
conservation report recommended 11 basins within the 90 square -mile watershed
area for water conservation purposes.
4
Lower San Sevaine Basin will provide 2,350 acre -feet of flood flow storage and
at the same time, provide available water conservation facility. The water
conservation element is discussed in more detail in Section II,C.
C. San Sevaine Creek Water Project
The Technical and Steering Committees of the Cities of Fontana, Rancho Cuca-
monga and Ontario, and the County of San Bernardino recommended the
preparation of an application for a low- interest loan from the Bureau of
Reclamation to assist in funding the San Sevaine Creek System.
The Loan Application Report and Environmental Assessment have been prepared by
the firms of Engineering- Science, Inc., and Bill Mann & Associates, Inc. The
report requests a low- interest loan of approximately $27,000,000 for an
approximate $42,000,000 project.
The Bureau of Reclamation Project will be funded under the Bureau's Small
Reclamation Projects Act of 1956, as amended. The "San Sevaine Creek Water
Project" is a water conservation project designed to capture and recharge
approximately 25,000 acre -feet into the Chino Underground Basin on an average
annual basis. The project area facilities, including the proposed water con-
servation basins, are shown on Figure No. IV.
The proposed Lower San Sevaine Basin is the major water conservation element
in the project, designed to provide 2,350 acre -feet of flood storage and a
recharge capacity of 234 acre -feet per day.
D. Hydrology
At the time the Day, Etiwanda and San Sevaine Creeks System Drainage Plan was
developed, preliminary hydrology for the three flood channels was provided.
Because of the significant development occurring in the Fontana area, the
updating of the hydrology for the entire San Sevaine Creek Watershed became
necessary.
5
An updated hydrology analysis and report entitled "Hydrologic Analysis and
Modeling of the San Sevaine Creek Watershed" was prepared by the firms of Bill
Mann & Associates, Inc., and Hall & Foreman, Inc. The computer modeling has
been approved by the Flood Control District. The hydrology report text dated
January, 1987 (revised), has been submitted in final form for review and
approval by the Flood Control District.
The major significance of the Lower San Sevaine Basin to the watershed area is
the flood flow storage. The basin will provide 2,350 acre -feet of storage
volume. The storage reduces the 100 -year frequency peak flow of the San
Sevaine Creek tributary area from 12,300 to 2,650 cfs. The reduction in peak
flow has allowed the downsizing of the channel below the basin at significant
savings in construction costs, and has reduced the channel flow in Riverside
County to the point where channels already constructed are adequate in size.
The San Sevaine Creek watershed hydrology map is included as Figure No. V for
reference purposes. Table I shows the 100 -year peak flow at certain points
within the watershed, including the Lower San Sevaine Basin.
E. Preliminary Design of the Basin
Sheets 1 thru 3 of Figure No. II show the preliminary design of the basin. It
should be emphasized the plans included herein are provided primarily to
prepare a reasonable cost estimate, estimate the approximate excavation
required to develop the basin capacity, and estimate the cubic yards of
material necessary to construct the levee embankment. The preliminary plan is
also necessary to determine the environmental significance and whether an
environmental impact report will be necessary.
The basin will fall under the jurisdiction of the California Division of Dams
and Safety. Therefore, the basin plan will have to be reviewed and approved
by the State Division of Dams. Because of the requested funding under the
Bureau of Reclamation's Small Reclamation Projects Act of 1956, the final
plans will have to be approved by the Bureau.
6
11
I Table I
1 Unit Hydrograph Peak Flow Rate (cfs)
100 -Year Event
li (Nodes)
Watershed Location
li Point Number 1983* 1986
1r UPPER ETIWANDA CREEK
2 3,077 4,821
1 3 5,287 7,385
4 - 7,996
or 7 = 8, 1 14
8 8,209
Ir UPPER SAN SEVAINE CREEK
1 1,967 2,921
1 401 ** - 7,425
403 * ** - 6,068 (12,330 * * * *)
t 4.1 (spillway) 4,100 2,651
ir SAN SEVAINE - ETIWANDA CREEKS
5 8,200 4,600
i r 7 12,200 7,258
8 8,530
ir 8' 12,200 14,958
9 15,550 18,218
ir 11 18,850 22,860
12 18,850 23,722
I * Day, Etiwanda and San Sevaine Creeks System Drainage
Plan (March, 1983)
I ** Flow at San Sevaine Basin No. 1
* ** Flow at Hawker Crawford at San Sevaine Basin No. 3
* * ** Combined flow at San Sevaine Basin No. 3
The watershed locatio1i point numbers (Nodes) are shown
on Figure No. II as 1
6A
Various aspects of the preliminary plan are briefly discussed below.
1. Basin Capacity
The San Sevaine Creek watershed hydrology analysis and report is based on
a flood flow storage volume of 2,350 acre -feet and a basin regulating
10'x 8' RCB ungated outlet. The preliminary basin plan, with the basin
flowline and elevation of top of levee as shown, was developed with the
intent to minimize the levee height and the amount of excavation. The
conceptual plan developed in the Day, Etiwanda and San Sevaine Creeks
System Drainage Plan was followed very closely because of the prior
approved Environmental Impact Report.
The flowline of the ungated 10'x 8' RCB was established to provide 350
acre -feet of dead storage below the outlet in accordance with the water
conservation requirements of the Bureau of Reclamation San Sevaine Creek
Water Project.
2. Basin Levee Embankment
The basin levee height was established to provide the required volume of
flood flow storage (2,350 acre -feet) discussed above. Dams and levees can
usually be designed with a minimum slope of 2:1 to 2.5:1 with the onsite
soils prevalent in the general area. The minimum top width of the levee
is usually 20 feet to provide an access roadway as well as the necessary
structural requirement. However, in this case, it is intended to place as
much of the required excavation in the levee as possible to reduce the
cost of having to haul the basin excavated material off site. Therefore,
a 30 -foot top width and 3:1 side slopes are proposed for the levee. The
final design of the levee will depend upon a detailed geological and soils
investigation, seismic criteria, the possible need for a core in the
levee, and criteria established by the State Division of Dams and Bureau
of Reclamation.
7
3. Spillway Design
As indicated in Section II,D, Hydrology, the hydrology for the San Sevaine
Creek watershed and the proposed basin has been established. The basin
will be designed to regulate a 100 -year frequency flood utilizing the
basin storage and the ungated 10'x 8' RCB outlet. The basin and outlet
will reduce the 100 -year flood flow of 12,330 cfs above the basin to a
2,650 cfs outlet flow. However, the spillway has to be designed for a
much higher flood flow to protect the integrity of the dam and prevent
overtopping the structure. The State Division of Safety of Dams requires
the design of "dam" spillways to pass the "maximum probable flood ".
The spillway consists of a 200 -foot wide rectangular spillway sized to
pass a 37,200 cfs flow without overtopping the dam. This flow corresponds
to the "Creager" formula with C = 100.
The final design of the spillway will be based on new hydrology for the
spillway based on the maximum probable flood criteria. The channel down-
stream of the spillway and levee embankment will continue to be based on a
100 -year frequency storm flow.
4. Outlet Works
The outlet works will be similar to the Los Angeles County Flood Control
District standards and will be uncontrolled. It will consist of a
10'x 8' RCB conduit that passes through the dam discharging into the
downstream San Sevaine Channel.
F. Soils and Geology
The onsite soil is predominantly cohesioness sand, gravel, cobbles and some
boulders. The site is a part of a boulder- strewn, sand and gravel alluvial
fan (wash) created over the eons by outflow from the San Gabriel Mountains.
8
The embankment will be constructed exclusively from reservoir excavation from
the site. If it is determined a core is needed for the embankment, it may be
necessary to import some fine material for the core. If this is the case, the
fine material will be excavated from other basins owned and operated by the
Flood Control District.
A detailed geological and geotechnical investigation and analysis will be
necessary for the final design.
9
SECTION III. ENVIRONMENTAL SETTING AND PRIOR ENVIRONMENTAL
ASSESSMENTS AND REPORTS
A. Environmental Setting
The proposed basin area consists of an existing elongated basin approximately
250 feet wide, 4,000 feet long and 20 to 30 feet deep. A concrete spillway is
located at the lower end of the existing basin. The basin outlets into a
concrete lined channel that passes under Highland Avenue and the Devore
Freeway. A grouted rock spillway also exists at the upstream end of the
existing basin that inlets flows from the San Sevaine Basins located
immediately northeast of the basin. Sheet 1 of Figure No. II shows the
existing basin, channels and Devore Freeway.
According to the Environmental Assessment provided for the Bureau of Reclama-
tion Loan Application Report, the site is composed of alluvial scrub, coastal
sage scrub and grassland with some Eucalyptus trees dispersed within the
basin. An old growth of alluvial fan woodland dominated by holly - leafed
Cherry is located at the western end of the site.
In recognition of the value of the holly- leafed Cherry woodland at the west
end of the site, the proposed levee will be designed to avoid as much of the
woodland as feasible from an engineering standpoint. This is a recommended
mitigation measure in the Environmental Assessment.
There have been several environmental assessments and impact reports prepared
for the drainage plan and proposed Bureau project. These reports are
referenced for a detailed analysis of the environmental setting.
B. Prior Environmental Assessments and Reports
There have been several prior environmental impact reports and /or assessments
on the overall flood control and water conservation projects. These reports
are listed below for reference.
10
1. A "Draft Environmental Impact Report /Statement" was prepared for the
Day, Etiwanda and San Sevaine Creeks Drainage Plan in February, 1984.
The EIR was approved by the County Environmental Review Board on June 7,
1985, and was certified by the Board of Supervisors on June 10, 1985.
The EIR was prepared by The Planning Network and Bill Mann & Associates.
The EIR included the proposed Lower San Sevaine Basin.
2. An "Environmental Assessment" was prepared for the San Sevaine Creek
Water Project to support the Loan Application Report submitted to the
Bureau of Reclamation.
The assessment was prepared by Engineering- Science and dated March, 1987.
A detailed biological survey of the San Sevaine Creek Water Project was
conducted by Karlin Marsh in 1983. A supplemental survey of the water
project area and a special survey for Federal candidate and proposed
endangered species was conducted by Karlin Marsh in May, 1986.
The Environmental Assessment is presently being reviewed by the County,
Bureau of Reclamation and other Federal and State agencies. The EA
covered the proposed Lower San Sevaine Basin in detail and listed several
concerns and mitigation measures. The concerns and mitigation measures
are discussed in Section III,C, "Social Impacts, Cultural and Biological
Resources ".
An EA was also prepared for the Bureau of Reclamation "Day Creek Water
Project" by The Planning Network and Bill Mann & Associates. Although the
assessment did not cover San Sevaine Creek, it is listed because of the
similarity in projects and some of the assessments were done for both
projects at that time.
11
C. Social Impacts
1. Water Conservation
As indicated above in Section II,C, the proposed basin is a major element
of the proposed San Sevaine Creek Water Project. The basin will assist in
capturing annual local runoff flow and storm flow for percolation into the
Chino Underground Basin. The local and major storm flow will flow through
the valley area to the Santa Ana River if sufficient water conservation
basins are not developed to store and percolate the flows for recharge
purposes.
The basin has an estimated recharge rate of 3 feet per day. The 100 -acre
recharge basin has an estimated recharge capacity of 234 acre - feet /day or
approximately 7,000 acre - feet /year based on a 30- day /year period. The
basin will have water in it on an average annual basis.
In addition, the California State Division of Water Resources and the
Metropolitan Water District of Southern California have reviewed the use
of basins in the Chino Basin area for their Conjunctive Use Program. The
agencies propose to recharge water into the underground basin during
periods of excess rainfall for retraction during dry years. The proposed
Lower San Sevaine Basin is one of the basins proposed for spreading of
State imported water.
Reference is made to the Water Conservation Report of the Day, Etiwanda
and San Sevaine Creeks Drainage Plan and the Bureau of Reclamation San
Sevaine Creek Water Project application report for details on water
conservation in the proposed project.
2. Flood and Drainage Control
As indicated above, the proposed basin is an integral part of the regional
flood control system described in Sections II,B and C. The basin will
12
provide 2,350 acre -feet of flood flow storage and regulate a 12,330 cfs,
100 -year flood flow down to 2,650 cfs.
The proposed basin storage has allowed the downsizing of the San Sevaine
Channel downstream because of the storage and peak flow reduction.
Several reaches of the channel have been constructed and /or designed with
the reduced flow in both San Bernardino and Riverside Counties.
Therefore, the project will provide direct benefits through improved flood
control at reduced costs to the general area.
3. Aesthetics
The proposed basin will have a levee varying from 10 to 40 feet above
natural ground on the south side of the basin. However, there are already
a series of fill areas between the Devore Freeway and the basin and
between Highland Avenue and the basin. The existing fill areas are 30 to
40 feet above the level of the Devore Freeway. There are also several
fill areas south of the freeway that are the same height.
The existing mounds are fill that was placed at the time the Devore
Freeway was constructed for the future Interstate Route 15 /Route 30
freeway to freeway construction. There is also an additional 200,000 yd3
to be placed by Caltrans for a ramp immediately south of the basin. The
ramp is part of the proposed interim interchange access construction
proposed for the 1987/88 Fiscal Year. The fill material for the ramp will
come from the basin excavation. In addition, an existing series of basins
located west of Cherry Avenue and upstream at the proposed Lower San
Sevaine Basin has levees in the 20 -foot range.
There will be limited visual contact of the proposed levee from the Devore
Freeway (Interstate 15) due to the existing freeway ramp fill. The
existing freeway fill will also limit visibility of the basin levee from
the area south of the freeway. Highland Avenue crosses over the freeway
13
on a fill and therefore will limit visual contact of the basin levee from
the south. The westerly part of the basin levee and spillway will be
visible from the area north of Highland Avenue and west of the existing
Etiwanda Channel. The area north of the basin is for the most part at the
same elevation as the top of the north basin levee. There will be a levee
approximately 10 feet in height along a portion of the north levee.
It is proposed to infill between the south basin levee and the proposed
freeway ramp to dispose of material. The California Department of
Transportation has considered the concept and has included it in their
project report due to its safety feature relating to the freeway ramp. If
the area between the proposed levee and ramp is filled in, it will assist
in softening the visual impacts of the levee.
The basin plan view, Devore Freeway, Highland Avenue, existing future
freeway ramp fills, and existing Etiwanda and San Sevaine Channels are
shown on the preliminary plans, Figure No. II, Sheets 1 thru 3.
Due to the existence of the 20 to 30 -foot high future freeway ramp fill,
the Devore Freeway, elevated Highland Avenue and the existing basins east
of the proposed basin, it would appear the visual impact of the basin
levee will be minimal. The basin area is a part of the hiking trails pro-
posed for the area by the City of Rancho Cucamonga. Subject to
compatibility and arrangements made for maintenance and operation, it may
be possible to landscape the basin to some degree to further soften the
aesthetic impact of the levee.
4. Cultural and Biological Resources
A Class III cultural resources inventory and impact evaluation, including
a field survey, were conducted as a part of the Environmental Assessment
for the Bureau of Reclamation San Sevaine Creek Water Project.. No prehis-
toric archaeological sites were identified within or near the proposed
basin. The inventory is listed in Section IV, References, and discussed
in detail in the Environmental Assessment.
14
A biological assessment of the proposed Lower San Sevaine Basin was made
by Karlin Marsh for the San Sevaine Creek Water Project. The studies are
listed in Section IV, References, and discussed in the above mentioned
Environmental Assessment.
The County of San Bernardino, in support of the Loan Application Report
and Environmental Assessment submitted to the Bureau of Reclamation for
request of project funding, has committed to certain mitigation measures
for the Bureau San Sevaine Creek Water Project. For information purposes,
Section 7 of the Environmental Assessment is included in the Appendix.
Table 7 -1 lists a Summary of Mitigation Measures. Mitigation Measures 1,
2 and 8 apply directly to the proposed Lower San Sevaine Basin.
15
SECTION IV. REFERENCES
Bill Mann & Associates, Day, Etiwanda and San Sevaine Creeks System Water Con-
servation Report, March 1983.
Bill Mann & Associates, Day, Etiwanda and San Sevaine Creeks Drainage Plan,
Volumes 1 and 2, March, 1983.
Cottrell, M.G. (Archaeological Resources Management Corp.), 1983, Archaeo-
logical Resources Assessment Conducted for the Day /Etiwanda /San Sevaine Creeks
Drainage Plan and the Day Creek Channel Debris Basin, May.
Lerch, M.K., 1986, Class III Cultural Resources Inventory, San Sevaine Creek
Water Project, San Bernardino County, California, August.
Marsh, K.G., Day Creek Flood Control Project Biological Resources Assessment,
March, 1983.
Marsh, K.G., Biological Resources Assessment Physical Setting Reconnaissance
San Sevaine and Etiwanda Creeks for Proposed Channel Improvements, Levee Rein-
forcements and Debris Dams, prepared for The Planning Network, May, 1983.
Marsh, K.G., Results of Survey of Upper Etiwanda Creek Debris Dam and
Spreading Basin Site, Upper San Sevaine Creek Debris Dams and Spreading Basin
and Lower San Sevaine Basin for Federal Candidate and Proposed Rare /Endangered
Biota Species, June, 1986.
Marsh, K.G., Supplemental Information Attachment to Biological Resources
Assessment, Physical Setting Reconnaissance, San Sevaine and Etiwanda Creeks
for Proposed Channel Improvements, Levee Reinforcements and Debris Dams,
August 21, 1986.
Moore & Taber, 1981, Reconnaissance Geotechnical Investigation, Debris /Reten-
tion Basins, Day and East Etiwanda Creeks, Western San Bernardino County,
California, July 8.
The Planning Network /Bill Mann & Associates, 1984, Draft Environmental Impact
Report /Statement Day Creek Water Project /Day, Etiwanda and San Sevaine Creeks
Drainage Plan /Master Plan for the San Sevaine Channel, February.
The Planning Network /Bill Mann & Associates, 1984, (Preliminary Draft)
Environmental Assessment, Day Creek Water Project, prepared for County of San
Bernardino, submitted to U. S. Department of Interior Bureau of Reclamation,
August.
The Planning Network /Bill Mann & Associates, 1985, 1986, Draft Environmental
Assessment, Day Creek Water Project, prepared for County of San Bernardino,
submitted to U. S. Department of Interior Bureau of Reclamation.
16
APPENDIX
1. San Sevaine Creek Water Project - Environmental Assessment -
Proposed Mitigation Measures
r
✓ DRAFT
✓ ENVIRONMENTAL
r
ASSESSMENT
✓ SAN SEVAINE CREEK
- WATER PROJECT
r
PREPARED FOR
COUNTY OF SAN BERNARDINO
11 California
n
SUBMITTED TO
n
U.S. DEPARTMENT OF TH E INTERIOR
f BUREAU OF RECLAMATION
n
n MARCH 1987
n
ENGINEERING - SCIENCE
DESIGN • RESEARCH • PLANNING
n 75 NORTH FAIR OAKS AVE. • P.O. BOX 7107 • PASADENA, CALIFORNIA 91109
ri
/
•
ri
SECTION 7
ENVIRONMENTAL COMMITMENTS
1 Twenty -eight mitigation measures are proposed to reduce potential
adverse impacts to environmental resources in the project area. These
1 measures are summarized in Table 7 -1. The agency that would be
responsible for these mitigation measures is the contracting agency,
most likely the County of San Bernardino. Some mitigation measures are
part of the project design, would be part of project specifications, or
1 are standard practice, while others would require the commitment of the
project sponsor. Some mitigation measures are contingencies and might
be required as a result of construction activities. Preliminary cost
estimates for those mitigation measures that are not design elements,
specifications, or standard practice are provided in the accompanying
Loan Application Report.
TABLE 7 -1
SUMMARY OF MITIGATION MEASURES
Mitigation
Measure
No. Brief Description
WATER QUALITY
1 Develop and conduct water quality monitoring program for
urban runoff
BIOLOGICAL RESOURCES
2 Limit construction work to avoid and /or minimize
disturbance to alluvial fan scrub habitat
3 Revegetate temporary construction staging areas and
roadways
r -I R 133 _ 7 -1
1
ripir TABLE 7 -1 (Contd)
Mitigation
Measure
No. Brief Description
4 Salvage native needle grass Stipa cernua prior to
excavation of Lower San Sevaine Basin
5 Use low smooth- wire - topped fencing for the western end of
9111 Lower San Sevaine Basin to avoid disturbance by ORVs
6 Provide water to Etiwanda Creek woodland
SOILS
7 Stockpile excavated construction material, sediment, and
rill debris to prevent erosion
8 Use excavated material from project area for fill
LAND USE
9 Set aside a major portion of existing Etiwanda Spreading
Grounds as open space
PUBLIC SERVICES
rill Submit plans to utility companies
11 Have local agencies review development projects
TRAFFIC /TRANSPORTATION
7 11( 12 Plan construction to minimize number of roads to be
closed
13• Schedule construction to minimize amount of time each
road is to be closed
14 Post notice to motorists of road closure and alternate
routes
15 Circulate railroad closure notice and construct temporary
bypass
SAFETY /NUISANCES
16 Fence facilities to minimize unauthorized entry
17 Conduct mosquito /vector inspection and treatment
R 133 7 -2
T
• .
[ TABLE 7 -1 (Contd)
Mitigation
Measure
No. Brief Description
I n
18 Limit construction to 7 a.m. to 7 p.m. in residential
1 rml areas
19 Develop access routes for trucks that avoid residential
i areas
i
20 Temporary storage of excavated materials below debris dam
ni , and basins; transport discarded household items to
Milliken Landfill
ill CULTURAL AND PALEONTOLOGIC RESOURCES
21 Avoid historic site on high ground near transmission
lines in San Sevaine Spreading Grounds
22 Monitor construction during initial grading of northern
- portions of project area (i.e., at canyon mouths)
ill 23 Have site evaluated by archaeologist if artifacts or
historic resources are found during construction
24 Have site evaluated by paleontologist if fossil remains
uncovered during construction
0 VISUAL RESOURCES
25 Fence construction storage areas
n -
26 Remove unneeded construction material and equipment
h AIR QUALITY
27 Time clearing and excavation to minimize exposure of
cleared areas
0 28 Water cleared areas, compact soil, and pave, seal, and /or
oil access routes and parking areas to prevent fugitive
irl dust
0
(I R 133 . 7 -3