HomeMy WebLinkAboutAGENDA REPORT 1994 1109 CC ADJ ITEM 07D.0 i ION:
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The Honorable City Council
Ken Gilbert, Director of Public Works
October 7, 1994 (Meeting 10- 19 -94)
Subject: Consider Authorizing Staff to Solicit Proposals
for a Feasibility Study to Construct a Pumping and
Transport System to Convey Groundwater from the
Water Wells at Arroyo Vista Community Park to
other City Parks and Landscaped Areas in the City
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Irrigation Water
October 1994
Page 2
Discussion
Transport System
•@ a •a
The Fox Canyon Groundwater Management Agency (FCGWMA) has
advised City staff that the maximum amount of groundwater
which can be extracted from these two wells is
approximately 574 acre feet (af) per year. The estimated
amount of water required to irrigate the present 33 acre
park is approximately 100 of per year. The estimated
amount of water required to irrigate Arroyo Vista
Community Park subsequent to full development is
approximately 200 of per year. This leaves approximately
374 of per year of groundwater extraction rights which are
not anticipated to be required for the irrigation of
Arroyo Vista Community Park. In addition, staff has
learned that the City may be able to acquire additional
groundwater extraction rights, making even more
groundwater available for other uses.
B. FCGWMA Regulations
The Fox Canyon Groundwater Management Agency (FCGWMA) has
established regulations requiring owners of water wells
under their jurisdiction to gradually reduce the amount of
groundwater extracted over the next several years. These
regulations may have a bearing on the feasibility of
developing and implementing the subject concept.
C. Irrigation Water Needs
Staff has prepared a survey of all of the City parks
(other than Arroyo Vista Community Park) and the City -
maintained parkways and medians. That survey indicates
that the annual irrigation water demands and costs for all
of the parks, parkways and medians now maintained by the
City is estimated to be approximately as follows:
AF f Yr Cost f Yr ($)
City Parks 163 100,000
Parkways & Medians 70 40,000
233 140,000
From this preliminary estimate it appears that the City
has sufficient unused groundwater extraction rights to
serve these facilities.
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Irrigation Water Transport system
October 1994
Page 3
D. Water Cost Comparison
1. Purchased Water: The above chart indicates that the
City's annual water purchase costs for landscape
irrigation is approximately $140,000. With the rate
increases being proposed by the Metropolitan Water
District (MWD), it is anticipated that the cost of
purchased water will increase at a rate much higher
than inflation over the next several years.
2. Reclaimed Water: Like other water purveyors in
Southern California, the County Waterworks District #1
is looking into the feasibility of marketing reclaimed
water from their sewage treatment plant. As you know,
the maximum amount of this resource available to the
District for this purpose is limited to the volume of
the treatment plant effluent. It is the understanding
of City staff that, when and if the District is in a
position to distribute reclaimed water to its
agricultural use customers, the cost for this product
would be comparable to the cost of potable water. The
primary objective of developing this resource is a
water conservation effort aimed at lessening regional
dependence on water imported from sources outside of
Southern California.
3. Well Water: If approved, the cost to construct the
capital improvements necessary to extract, store, pump
and distribute groundwater to the City's landscaped
areas would be amortized over a thirty (30) year
period. It is anticipated that this cost would be
considerably less than the cost of purchased potable or
reclaimed water.
E. Groundwater Transport System
The objective of the subject feasibility study would be to
determine if it would be cost effective to construct
storage facilities, booster pumps and water transport
lines to convey groundwater pumped from the Arroyo Vista
Community Park irrigation water wells to some or all of
the parkways, medians and City Parks in the City. That
study would consider a number of factors in providing this
analysis, including the following:
• the irrigation water requirements of those facilities;
• the extraction limitations imposed by FCGWMA;
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Irrigation Water Transport System
October 1994
Page 4
• the estimated amount of the capital improvement costs;
• the long term maintenance and operation costs;
• the estimated capital replacement costs; and,
• an assessment of the cost /benefit (or amortization
period) of the capital construction cost as compared to
the long term savings in water purchase costs.
F. Estimated Cost of Consultant Study,
Although a formal Request for Proposals (RFP) has not been
prepared and the full scope of work has not yet been
defined by a Proposal prepared by a qualified Consultant,
it is estimated that the cost of performing the subject
study would be between $10,000 and $20,000.
G. Committee Recommendation
At a recent meeting of the Public Works, Facilities and
Solid Waste Committee (Councilmembers Wozniak and
Montgomery) discussed the subject project and recommended
that the City proceed with the steps necessary to have a
Feasibility Study prepared.
H. FY 1994/95 Goals & Objectives
This new project is not listed as one of the identified
objectives in the FY 1994/95 Goals & Objectives being
considered by the City Council. If this prject is
approved, it is recommended that it be added to the list
of Goals and Objectives as a high priority ( *) item.
I. Fiscal Impact
If approved, it is the recommendation of staff that the
subject study be funded by a loan from the General Fund,
to be repaid by Assessment Districts 84 -2 and 85 -1. The
repayment of this loan could be handled in a number of
ways including the following:
• repayment of the loan from the FY 1995/96 assessments;
• repayment of the loan spread over several years;
• repayment of the loan whether or not the program is
actually implemented;
• repayment only if the program is designed, constructed
and implemented;
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Irrigation Water Transport System
October 1994
Page 5
deferral of the repayment until actual irrigation water
cost savings are realized by the Assessment Districts
through the implementation of this program; or,
future City Council action to forgive the loan if the
irrigation water distribution system is not
implemented.
It is also recommended that the actual appropriation and
budget amendment for the subject study be deferred until
the City Council considers a staff report recommending
retaining a consultant to perform the study.
Recommendation
The Public Works, Facilities and Solid Waste Committee
recommend that the City Council authorize staff to proceed
with the steps required to solicit proposals for a study to
evaluate the feasibility of developing and implementing the
above described irrigation well water distribution system.
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