Resolution 2530
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RESOLUTION NO. 2530
A RESOLUTION OF THE BOARD OF DIRECTORS OF
SOUTH TAHOE PUBLIC UTILITY DISTRICT APPROVING
NEGATIVE DECLARATION FOR SOUTH TAHOE PUBLIC UTILITY DISTRICT
FALLEN LEAF LAKE SEWER COLLECTION SYSTEM IMRPOVEMENTS
ASSESSMENT DISTRICT 1990-1
BE IT RESOLVED by the Board of Directors of South Tahoe
6 Public Utili ty District:
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1) The Board finds on the basis of its review and
8 consideration of the Environmental Assessments for the Fallen
9 Leaf Lake Sewer Collection System Improvements Project, the
10 Preliminary Design Reports, all Comments received and Responses
11 thereto and modifications incorporated into the Project after
12 consideration of said Assessments, Reports, Comments, and
13 Responses, that there is no substantial evidence that the Project
14 will have a significant effect on the environment.
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2) Based upon said finding the Board approves the
16 negative declaration circulated, a copy of which attached hereto
17 and made a part hereof.
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PASSED AND ADOPTED by the Board of Directors of South
19 Tahoe Public Utility District at a regular meeting on the 7th
20 day of June, 1990, by the following vote:
AYES: Directors Mason, Sinclair, Walker, Pierini, Onysk
ABSTAIN: None
NOES: None
ABSENT: None
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ROBERT MASON, CHAIRMAN OF BOARD
SOUTH TAHOE PUBLIC UTILITY DISTRICT
ATTEST:_~a ~~
PAT A. MAMATH, ERK OF BOARD
SOUTH TAHOE PUBLIC UTILITY DISTRICT
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NEGATIVE DECLARATION (CEQA)
FOR THE
SOUTH TAHOE PUBLIC UTILITY DISTRICT
F ALLEN LEAF LAKE SEWER COLLECTION SYSTEM IMPROVEMENT
PROJECT
The South Tahoe Public Utility District is the Lead Agency pursuant to CEQA and
has prepared an Environmental Assessment and Negative Declaration of
Environmental Impact for the project described as the Fallen Leaf Lake Sewer
Collection System Project. The District has conducted an Environmental
Assessment of the Projects' impacts and has determined that, with mitigation
incorporated in the project, there are no significant impacts.
Applicant:
South Tahoe Public Utility District.
Application:
Fallen Leaf Lake Sewer Collection System Project
Location:
Southwest shore of Fallen Leaf Lake
The Tahoe Regional Planning Agency is the Lead Agency pursuant to the TRP A
Compact, Regional Plan, and Code of Ordinances.
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Description of the Proposed Project
The project consists of the construction of improvements to the existing sewer
collection system at Fallen Leaf Lake. (Figure 1-3) The existing sewage
collection system has had numerous breakdowns and system failures which
have resulted in sewage being discharged on the ground and in some cases
reaching Fallen Leaf Lake.
A recent study by John Carollo Engineers titled "Fallen Leaf Lake Sewer
Collection System Facilities Study", Oct. 1989, has identified improvements
which will improve the operating reliability of the system. "The Project"
has been designed in two phases. Phase I construction is the Project. The
Phase I improvements are specifically designed to resolve the concerns of the
Lahontan Regional Water Quality Board and the SWRCB Lahontan Board
Order #6-89-95. The Phase I improvements consist of improvements to the
vacuum stations and export line on the south side of Fallen Leaf Lake.
The current system has been plagued with problems since its installation and
completion in 1983. The general problems with the current system are due to
the interdependent nature of all of the components of the system. A failure
in one component, e.g. a vacuum station, causes a "domino effect" which can
cause all of the vacuum stations to fail.
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The new system improvements will replace the components which have
caused the majority of the problems. The project will replace
the ejector pumps and combine some of the vacuum stations to provide a
significant increase in reliability. These improvements will also create more
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Fallen Leaf Lake Sewer Collection System Improvement Project
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FALLEN LEAF LAKE
SEWER COLLECTION SYSTEM MODIFICATIONS
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SEAL EXISTING AIR RELEASE
VALVE VAULTS ON
MAIN EXPORT UNE (TOTAL OF 11)
,-... FALLEN LEAF LAKE ~
(S)
MODIFY INSTRUMENTATION
AT EXISTING MAIN EXPORT
STATION
(3)
REMOVE VACUUM STATIONS
VVS-1 AND VVS-2
<ID
ADD STORAGE TANKS
TO EXISTING
VACUUM STATION VVS-3
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ADD PUMPS
TO EXISTING VAULTS
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INSTALL 40 FT. PIPING
FROM PRESSURE UNE
TO EXISTING MANHOLE.
INSTALL FLOW METER
PS-2 I cJ
STANfORD
- SIERryA ......
CAM
f-N
Not to Scale
A ril23,1990
Source: John Carollo En 'neers
STPUD Pallen. Leaf Se~er System
THE PROJECT
Im pro"Vemen. t
FIGURE
1-3
:I-1:.ARL.AN"D B.A.RT:I-1:C>LC>1vf:EYV &c .ASSC>CI.A TES, I:I:'-JC.
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independence among the system components so that when one component fails,
the entire system will not fail.
The Project improvements consist of replacing the existing ejector pumps ES-1,
ES-2 and ES-3 with conventional duplex pumps, and sealing the ejector vaults
to act as wet wells. The vacuum system will also be improved by
consolidation of vacuum stations VVS-1 and WS-2 into WS-3. Emergency
storage will be added to VVS-3, and air release valves will be added to the
vacuum main which will be converted for use as a pressure force main.
Improvements to the main export system will be made by sealing the existing
ARV vaults. Emergency power will be provided for the pump stations on the
south side of Fallen Leaf Lake. The emergency generator will be housed in a
small structure adjacent to Stanford Camp. Flow meters will be installed to
collect flow data from Stanford Sierra Camp, Stanford Hill, and Fallen Leaf
Lake Campground.
Installation of the project will entail the following: site excavation and
trenching; installation of piping and new pumps, installation of an emergency
storage tank, and provide for standby power/emergency generator for the
converted pump stations. Total additional permanent coverage for the project
is estimated to be 135 sq. ft.; the project construction activities will impact
an estimated 3,300 sq. ft. The disturbed areas will be revegetated and
restored according to an approved BMP plan.
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Replacement of the ejector pumps will require some disturbance of the
surrounding soils or geology. Replacement of the existing ejectors with
conventional duplex pumps at stations ES-1, ES-2 and ES-3 will be done
within the existing ejector vaults, which will also be sealed to act as wet
wells. The converted ejector vaults will be a totally sealed container located
underground to provide a wet well for the new duplex pumps.
Consolidation of vacuum stations WS-1 and VVS-2 into WS-3 will also be
accomplished with little excavation. The existing 4" vacuum main will be
converted to a low pressure force main requiring air release valves to be
installed at periodic intervals in the existing vacuum main. An emergency
storage tank will be added to vacuum station WS-3.
Standby/emergency power will be provided to the pump stations on the south
side of the Lake. The standby power system will consist of a package
generator, two exterior propane tanks and an electrical panel which will be
housed in a structure about 15'x 9' in size. No other additional land coverage
is proposed as part of the Phase I improvements. Refer to Figure 1-4 for the
generator location.
The Fallen Leaf Lake collection system improvements proposed in the future
may consist of the following modifications:
· The pumps at stations ES-6, 7, and 8 may be replaced with
conventional duplex pumps. Stations ES-8 and ES-9 may be
consolidated into one station; this consolidation would require
approximately 700 feet of trenching. Emergency storage would be
added into stations ES-5, 6, 7 and 9.
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Fallen Leaf Lake Sewer Collection System Improvement Project
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· Other modifications proposed as part of future improvements may
consist of consolidation of vacuum stations VVS-7 into VVS-8;
approximately 500 lineal feet of trenching will be required to
consolidate these two pump stations. The existing discharge
pumps may also be replaced, and emergency power installed.
The total cost for these future improvements is estimated to be
approximately $900,000.
Project Mitigation
The Environmental Assessment is intended to address in detail the Phase I
improvements proposed, the Project. If a determination is made that
additional improvements must be installed, a successive Environmental
Assessment will be made. Many of the impacts and mitigations identified
for the Project improvements will, however, be similar for the future
improvements.
Geologyl Seismicity
Trenching and excavation for new sewer lines, conversion of pump stations
and the installation of emergency generators shall meet all local, state and
federal seismic safety standards.
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Soils
The project sites shall comply with the coverage requirements of the TRP A.
Where project facilities exceed the allowable TRP A coverages, site specific
coverage off-sets shall be proposed in compliance with the Chapter 20 of the
TRP A Code of Ordinances.
Air Quality
Compliance with state vehicle emission control standards shall be required
for all propane equipment. Machinery will be maintained in the best
working condition.
Water Quality
All construction shall be completed in compliance with the TRP A code of
ordinances; the project shall incorporate Best Management Practices into the
design of soil stabilization and the contractor shall be required to follow
Best Management Practices during construction.
The District shall prepare an operations and maintenance manual for the
operations and emergency response program for the improved collection
system. The District shall require strict adherence to the approved
operations and maintenance manual.
Flora, Fauna and Fisheries
All construction and on-site improvements shall be conducted in compliance
with the adopted Best Management Practices.
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Fallen Leaf Lake Sewer Collection System Improvement Project
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4.,
Findings
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Noise
Powered equipment and vehicles used during construction phases and for site
maintenance will be equipped with adequate mufflers and/or enclosures at
all times.
Construction activities or equipment with noise levels in excess of 50 CNEL or
threshold single event levels will be limited to the hours of 8 a.m. to 6:30
p.m. Construction activity may begin before 8:00 a.m. if approved by the
TRPA in compliance with the TRPA Code of Ordinances. Work at night will
be specifically authorized by the TRP A.
Scenic Resources
Site revegetation and landscaping shall include plant materials to screen the
generator from view from adjacent residential areas. All landscaping and
revegetation shall be installed according to the TRP A Best Management
Practices.
Cultural Resources
In the event that any cultural or historic resources should be uncovered during
construction, all work will be stopped and an evaluation of the resource
shall be conducted by a qualified professional in compliance with state and
TRP A regulations.
It has been found that this project as described herein and in the
Environmental Assessment for the Fallen Leaf Lake Sewer Collection System,
April 23, 1990, will not have a significant effect on the environment and an
Environmental Impact Report (EIR) is not required by the California
Environmental Quality Act. The following findings support the Negative
Declaration of environmental impact:
1. The environmental impacts associated with the proposed
modifications are construction related short-term impacts which
will occur within the existing project site. No significant
irreversible impacts associated with the project have been
identified.
2. The project will not significantly alter the risk of upset or
exposure to a risk of failure during a seismic event. The project
will be engineered to the latest applicable UBC seismic
standards.
3. Implementation of the project will increase the operational
reliability of the sewage collection system and will eliminate or
reduce the potential for spills of sewage into Fallen Leaf Lake.
4. Construction impacts associated with the project will be limited to
the immediate area around the existing pump and ejector vaults.
Each site will be revegetated and landscaped in accord with an
approved Best Management Practices Plan for revegetation and
erosion control.
5. The noise generated from the project pumps and emergency
generator will be less than significant with the implementation of
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Fallen Leaf Lake Sewer Collection System Improvement Project
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acoustic project mitigation measures. During the construction of
the project, noise from construction activities will dominate the
noise environment in the immediate area. Construction activities
will be temporary and will occur between 8:00 am and 6:30 pm.
6. The project will result in no permanent increases in vehicular
trips. During the project construction period an estimated increase
of 10 to 20 vehicle trips will be generated.
7. The project components will be installed in the existing pump
vaults below ground with the exception of the emergency generator
housing.
Any person may object to dispensing with an EIR for this project, or they may
respond to ,the findings in this Negative Declaration. Information relating to
the proposed project is on file in the following locations:
South Tahoe Public Utility District
Attention: Robert Baer
P.O. Box 19487
South Lake Tahoe, California 95706-3487
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Tahoe Regional Planning Agency
P.O. Box 1038
Zephyr Cove, Nevada 89448-1038
City of South Lake Tahoe
1052 Tata Lane
P.O. Box 1210
South Lake Tahoe, CA 95705
EI Dorado County Library
1000 Rufus Allen Blvd,
South Lake Tahoe, CA 95705
Harland Bartholomew and Assoc, Inc.
3807 Pasadena Avenue, Suite 180
Sacramento, Calif. 95821
Any person wishing to examine or obtain a copy of this document, or seeking
information as to the time and manner to comment or register their objection,
may do so by inquiring at said offices during regular business hours.
A copy of the Environmental Assessment is attached hereto.
day of May, 1990.
Manager/Engineer
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South Tahoe Public Utility District
1275 Meadow Crest Drive,
South Lake Tahoe, Calif. 95705
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Fallen Leaf Lake Sewer Collection System Improvement Project
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