HomeMy WebLinkAbout02/20/1990, 6 - GROUNDWATER BASIN EVALUATION MEERNS
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a my o f San Luis omspo COFe1990
0096 UNCILe A ITBN
REPORT 6
FROM: William T. Hetlande Prepared by Allen Short
Utilities Director Water Division Manager 10
SUBJECT: Groundwater Basin Evaluation
RECOMMENDATION:
Authorize staff to solicit Request for Proposal (RFP) for
professional engineering services for evaluating the groundwater
basin.
BACKGROUND:
The City of San Luis Obispo relied primarily on groundwater until the
early 1940's when the Salinas Reservoir was developed. In the 19601s
the Whale Rock Reservoir was added to the City's water supply..
Recently, as the City began reaching the maximum yields of its
reservoir supplies, it once again began to look at groundwater as an
additional source. The firm of John L. Wallace and Associates in
conjunction with Timothy Cleath, Hydrologist, was retained to perform
a groundwater study in December of 1987. The first report,
"Groundwater Study Survey of Resources and Constraints Analysis", was
completed in March 1988. This report reviewed historical groundwater
data and identified a test drilling program. In August 1988, John
Wallace and Associates submitted the results of the drilling program
in its report "Groundwater Study - Exploration Results". This report
outlined drilling locations, test pumping and water quality analysis.
Based upon this work the groundwater development program was divided
into two phases.
Both phases of the groundwater development program have been
completed. The wells identified in both phases, have been developed
and are operational. Additionally, to fully utilize groundwater to
it's greatest benefit a zonal booster pump station was designed and
installed at the Edna Saddle Reservoir. This pump station allows the
City to move large amounts of groundwater from one area of the City
to another.
To assist staff in the proper management of groundwater and to
determine the safe annual yield (and environmental impacts) requires
a complete and thorough evaluation of the groundwater basin.
Council has identified 500 acre feet of groundwater as part of its
safe annual yield. After the City comes out of the drought the
Council may want to identify additional yield from the groundwater
supply. If this were the case, the groundwater basin may be required
to be modeled to accurately identify the additional yield. In either
case, in order to properly manage the groundwater basin and to insure
a long term water supply, the following information needs to be
addressed:
RECEIVE®
FEB 9 1990
CLERK s
SAN LUIS OBISPO.CA
Gay% City of.sari tins osispo
CO tJNCIL AGENDA REPORT
Groundwater Basin Evaluation
February 20, 1990
Page 2
1. Obtain, review, and summarize existing available data regarding
surficial and subsurface geology and hydrology as necessary to
characterize and define the horizontal and vertical extent of the
San Luis Obispo Valley Aquifer (DWR Basin Designation 3-9) .
Produce longitudinal and transverse sections of the aquifer
indicating limits and general geology.
2. Produce a contour map of the groundwater piezometric surface
indicating well locations and indicating general direction of
flow.
3. Describe and identify the timing, location, source, and volume of
recharge into the aquifer.
4. Describe and quantify the gross and net useable storage volume in .
the aquifer.
5. Identify locations and estimate total volume of annual
withdrawals from the aquifer.
6. Estimate the safe annual yield of the aquifer.
7. Identify and discuss general environmental impacts associated
with further development (i.e. , additional withdrawals) of the
aquifer, for both operation within the safe annual yield and
overdraft operation.
8. Prepare a report which identifies the best managerial approach to
maximum utilization of the groundwater basin and include:
a. Location of additional wells.
b. Maximum pumping rates.
C. Coordinated well operation.
d. Mitigation of environmental impacts.
9. Assist City Staff with at least two presentations to the City
Council during the study. Attendance at more than two such
meetings may be considered as extra cost to the Consultant.
The State Department of Resources and the County of San Luis Obispo
have jointly combined forces to investigate and model the San Luis
Obispo Creek and Pismo Creek Basins. Based upon discussions with the
State Department of Water Resources, they are in the beginning stages
of data collection. They optimistically estimate that the
evaluation, basin modeling and final report are approximately two
plus (2) years from completion. Additionally, they estimate that the I
data collection and evaluation phase is scheduled to be completed in
j p city of san Luis ompo
COUNCIL AGENDA REPORT
Groundwater Basin Evaluation
`- February 20, 1990
Page 3
the first half of 1991. Determination of the safe annual yield and
total groundwater basin evaluation is essential for proper resource
management. To wait for the State to complete their study is not in
the City's best interest. If the evaluation phase results recommends
basin modeling, we may be in a better position to wait for the State
results.
FINANCIAL IMPACT:
To conduct an evaluation of the groundwater basin is estimated not to
exceed $ 30,000 dollars. If the evaluation results indicate that the
groundwater basin should be modeled it is estimated not to exceed an
additional $ 150,000.
This project was not originally identified in the 1989-91 financial
plan and approved budget. The money has been identified to come from
water fund balances.
CONSEQUENCES OF NOT TAKING ACTION:
The ability to properly manage the groundwater basin will be greatly
impaired. Additionally, the safe annual yield and environmental
impacts will continue to be unknown.
ACTION RECOMMENDED:
Authorize staff to solicit Request for Proposal (RFP) for
professional engineering services for evaluating the groundwater
basin.
Attachment: Request for Proposal for Engineering Services for
Groundwater Basin Evaluation
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G r
amrgI city Of sa► . Luis OBISPO
COUNCIL AGENOA REPORT
Groundwater Basin Evaluation
February 20, 1990
Page 4
APPROVED:
Ci y A 'nis ativ fficer
t rn
e117 '11117
Finance Director
Utilities Director
Water Division Manager
I
o . .
CITY OF SAN LUIS OBISPO
REQUEST FOR PROPOSAL
FOR ENGINEERING SERVICES .
FOR GROUNDWATER BASIN EVALUATION
i
CO v
n
GENERAL NOTICE
1.
The City of San Luis Obispo invites your firm to submit a proposal to
provide engineering services for Groundwater Basin evaluation.
Sealed proposals for professional engineering services for the
Groundwater Basin Evaluation will be received by the City Clerk's
Office, P.O. Box 8100 San Luis Obispo CA, 93403, on or before
XXXXXXXXX Proposals received after that date will not be accepted.
Contacts regarding the development of a proposal and the status of
interviews shall be made with Allen Short Water Division Manager, in
the Utilities Department.
Please submit your proposal in six (6) copies to the attention of the
Water Division Manager. The proposals shall be submitted in
envelope(s) clearly marked indicating the project title.
BACKGROUND
The City of San Luis Obispo is located on the Central Coast
approximately at the half way point between San Francisco and Los
Angeles. The City, until the early 19401s, had used groundwater
exclusively as its sole source of domestic water supply. However, in
1944 the construction of Salinas Dam was completed and the City
converted from groundwater to surface water to satisfy its domestic_
requirements. Additionally, in 1963 construction was completed on a
second surface water reservoir (Whale Rock) which added to the City' s
supply. However, with increasing water demands and limited rainfall
over the past four (4) years, the surface water supplies have not
replenished to adequate levels. As a result, the City has undertaken
and implemented a groundwater development program.
Currently, the City has developed six wells which range in production
from 80 gpm (134 acre feet) to 700 gpm (1100 acre feet) . The City is
in the process of developing additional wells. The wells have been
. primarily developed in the southwest section of the City with a few
low producers located in the northern section of the City.
In an effort to manage increasing water demand with diminishing
surface water supplies, the City needs the groundwater basin
evaluated in order to provide the City with the information to
properly manage all of the City's water resources.
SCOPE OF WORK
The consultant(s) shall complete the. studies, evaluations, and
evaluation of the groundwater basin to determine the safe annual
yield and environmental impacts of groundwater development. The
consultant(s) shall address the following:
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1• Obtain, review, and summarize existing available data
regarding surficial and subsurface geology and hydrology as
necessary to characterize and define the horizontal and
vertical extent of the San Luis Obispo Valley Aquifer (DWR
Basin Designation 3-9) . Produce longitudinal and transverse
sections of the aquifer indicating limits and general geology.
2. Produce a contour map of the groundwater piezometric surface
indicating well locations and in
flow. dicating general direction of
3. Describe and identify the timing, location, source, and volume
of recharge into the aquifer.
4• Describe and quantify the gross and net useable storage volume
in the aquifer.
5• Identify locations and estimate total volume of annual
withdrawals from the aquifer.
6. Estimate the safe annual yield of the aquifer.
7• Identify and discuss general environmental impacts associated
with further development (i.e. , 'additional withdrawals) of the
aquifer, for 'both operation within the safe annual yield and
overdraft operation.
$• Prepare a "report which identifies the best managerial approach
to maximum utilization of the groundwater basin and include:
a• Location of additional wells.
b. Maximum pumping rates.
C. Coordinated well operation.
d. Mitigation of environmental impacts.
9• Assist city staff with at least two presentations to the City
Council during the study. Attendance at more than two such
meetings may be considered as extra cost to the Consultant.
SPECIAL REQUIREMENTS
1. Consultant selected will be required to enter into the City's
standard contract form. The City will also require proof of
Workers Compensation Insurance and Comprehensive General
Liability as a minimum of and Proof of Errors and Omissions
Insurance in minimum amounts of $500, 000/$1, 000,000.
2. Firms or individuals submitting a proposal and any associated
consultant or subcontractor must be legally qualified in the
State of California to practice the work required in this RFP
and must hold all licenses and /or registrations required by
law. The selected firm will have to obtain a City of San Luis
Obispo business license.
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CONTENT OF PROPOSAL
The proposal from the consultant should include the following;
1. Legal name, address and telephone number of firm submitting
proposal.
2 . Name, address, and telephone number of the person to whom
correspondence should be directed.
3 . Year the firm was established as it is currently operating.
4. Is the firm an individual, partnership, corporation, joint
venture, etc.
5. The maximum fee to do the work as outlined under the scope of
work.
6. A breakdown of the estimate for performing the work to include
'the costs of hourly personnel charges, equipment, materials,
and travel.
7. Comments from the consultant regarding his approach to the.
project and any recommended modifications to the scope of work
that consultant feels would be desirable.
8. The Consultant will submit a proposed schedules
9. Complete list and description of previous projects of a
similar nature in which the firm has been involved including
the status of these projects and address of contact persons
employed by the project owner.
SELECTION CRITERIA
The initial selection of a consultant(s) will be based on. the
following criteria:
1. It is the City of San Luis Obispo's desire to place the
responsibility for the success of the overall project with one
consultant because of the need for continuity in coordination
of the various phases of the project. Continuation of
consultant services beyond the preliminary study phases is
solely at the City's discretion.
2. Evaluation will be based not only upon thefirm's capabilities
but also the abilities and accomplishments of individuals to
be assigned to the project. Proven experience with
Groundwater evaluation is required expertise of the firm.
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SELECTION PROCESS
The proposals submitted will be reviewed by a selection committee
consisting of City staff members. After evaluating the proposals,
the City will select a minimum of three (3) candidates for an oral
interview. The committee will submit a recommendation to the City
Council for final determination. .
Each consultant's proposal will be reviewed on the following
criteria:
1. Professional excellence and technical approach.
2. Demonstrated competence on similar projects, (selected firm
will have been thoroughly involved in at least two successful
groundwater evaluation projects that are completed, including
control of costs, quality of work, and completion in a timely
manner.
3 . Education and experience of key personnel. Resumes should be
furnished for the proposed team members, team leader and
alternates designated.
4. Financial capability, estimated fee schedule and method of
compensation.
5. Candidate's capacity to perform the work in a timely fashion.
A proposed work plan, organization chart, and man-weeks
estimate for each item in the plan should be included.
6. Candidate's familiarity_ with the type of problems applicable
to the project.
FINA1 REPORT
1. Within thirty (30) days of project completion the consultant
shall furnish the City with a Final Report.
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