HomeMy WebLinkAbout09/21/2004, BUS 2 - WATER REUSE MASTER PLAN council. Sept. 21, 2004
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CITY OF SAN LUIS O B I S P O
FROM: John Moss, Utilities Director,
Prepared By: Gary W. Hen rson, Water Division Manager A&I
SUBJECT: WATER REUSE MASTER PLAN
CAO RECOMMENDATION
1. Approve the Final Water Reuse Master Plan,July 2004.
2. Consider the Addendum to the Water Reuse Project EIR relative to the Water Reuse
Master Plan and find that the preparation of a Supplemental EIR is not necessary.
3. Approve the strategy based on a hybrid of alternatives A-1 & A-2, for future annual
expansion of the Water Reuse System to provide incremental increase in the water available
for non-potable uses.
DISCUSSION
Background
The City of San Luis Obispo has been pursuing development of the Water Reuse Project for many
years. Phase 1 of the Project is currently under construction, which includes improvements at the
Water Reclamation Facility and offsite distribution pipelines for delivery of recycled water to parks,
schools and other sites in the southern portion of the City.
The City applied for a State grant to prepare a Water Reuse Master Plan to identify the logical
expansion of the reclaimed water distribution system and to allow full utilization of the available
water from the Water Reclamation Facility. In October of 2002,the City received notification from
the State Board that the grant application had been approved. The grant provides matching funds,
up to$75,000,for the development of the Master Plan.
The City contracted with Dudek and Associates for development of the Water Reuse Master Plan.
The total contract for the Master Plan development was $124,390. The grant funding will pay for
50% of the cost and will also reimburse the City's staff time associated with this project up to the
total grant of$75,000.
Existing Water Reuse System
The Water Reclamation Facility (WRF) produces tertiary treated wastewater that can provide up to
1,200 acre feet per year of non-potable water for irrigation and other approved uses. Improvements
are under construction at the WRF to provide treated effluent storage, pumping facilities and other
related improvements. In addition to the onsite improvements, approximately 7.6 miles of
distribution pipelines have been installed ranging in size from 6" to 20". The existing distribution
system has two branches referred to as the west branch and the east branch as described below:
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Council Agenda Report—Water Reuse Master Plan
Page 2
1. West Branch: The west branch extends west from the WRF under Highway 101, then along
Calle Joaquin to Los Osos Valley Road (LOUR) to near the westerly city limits on LOVR.
There is a secondary branch which extends from LOVR along Madonna Road to Laguna
Lake Park.
2. East Branch: The east branch begins at the WRF and follows Prado Road easterly to the
city limits, then along existing easements to Broad Street, thence southerly along Broad to
Tank Farm Road,then easterly to the terminus at Islay Hills Park.
Following completion of the Phase 1 project, it is estimated that up to 130 acre feet of recycled
water will be used to meet irrigation demands at parks, schools, sports fields, and other sites. This
leaves approximately 1,000 acre feet of additional recycled water available for other locations.
Market Assessment
A market assessment was undertaken utilizing the City's GIS information and water billing
consumption records. These two systems were linked to allow a geographic analysis of potential
large water users that could utilize recycled water to meet a portion of their water needs. Also
identified in the assessment is the potential to deliver recycled water for agricultural purposes in
exchange for groundwater currently used to meet those agricultural demands. The groundwater
could then be treated and utilized to meet potable water demands throughout the system. The
analysis indicates that potential user sites along the Phase 1 system could utilize approximately 740
acre feet per year of recycled water. This includes approximately 380 acre feet of groundwater
exchange. In addition, it is estimated that new development in the Dalidio, Orcutt and
Margarita/Airport areas could utilize approximately 275 acre feet per year for irrigation uses. This
analysis reveals that up to 1,015 acre feet per year could potentially be served from the Phase 1
backbone system. If this level of demand can be achieved, this would leave approximately 200 acre
feet available for other areas in the city.
Alternative Analysis
Five alternative system expansions were evaluated to deliver additional recycled water to areas
north of the Phase 1 system. In addition, the analysis evaluated the need for storage and additional
pump station capacity to meet the full system demands. The goal of each alternative is to utilize the
full available supply (approximately 1,200 afy) from the Reuse Project. A hydraulic model was
used to evaluate each alternative and identify required pump capacity, storage capacity, and pipeline
sizes. The five alternatives are identified as Alternatives A (1&2), B, C and D as discussed in more
detail below.
Alternative A — Alternatives A-1 and A-2 are similar and attempt to serve the southern area of the
city with the one pressure zone (elevation 425) currently designed for the Phase 1 project. This
eliminates the need for additional booster stations out in the distribution system. Alternative A-1
(Attachment 2) proposes two additional pumps at the WRF (facilities have already been designed
with necessary space) and an additional 1.3 million gallon (mg) storage reservoir onsite at the
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Council Agenda Report—Water Reuse Master Plan
Page 3
WRF. Alternative A-2 (Attachment 3) proposes one additional pump at the WRF and a 1.3 mg
storage reservoir located on the western portion of the South Street Hills area. Both alternatives
provide water to the terminus locations but take different routes. A-1 utilizes South Broad Street as
the primary corridor while A-2 follows South Higuera north to South Street and beyond. Each
alternative identifies using one of the two abandoned 8" steel oil pipelines that have been granted to
the city many years ago. This would allow delivery of water to San Luis Obispo High School.
Since the school currently uses groundwater to meet the majority of their irrigation demand,
extension of the system to the High School may not be warranted.
Alternative B —Alternative B (Attachment 4) extends the pipe system north from Sinsheimer Park
(as identified in Alternative A-1 & 2) to Cal Poly University- Because of the higher elevations as
you move north through the city, this alternative would require one additional pump at the WRF, a
one million gallon reservoir and pump station on Terrace Hill, and a 500,000 gallon reservoir on a
hillside on the Cal Poly Campus.
Alternative C — Alternative C (Attachment 5) also evaluates providing water to the Cal Poly
Campus but extends the pipe system from San Luis Obispo High School (as identified in
Alternative A-2) to the Cal Poly Campus. This alternative would require an additional pump at the
WRF and 1.0 mg reservoir on South Hill (same as Alternative A-2), as well as a new pump station
near San Luis Obispo High School and a 500,000 gallon reservoir on Cal Poly Campus.
Alternative D—Alternative D (Attachment 6) adds a separate higher pressure zone to serve the Cal
Poly Campus irrigation needs. This alternative would include a separate pump station to serve Cal
Poly at the WRF, two additional pumps at the "existing" WRF pump station (Phase 1 project), an
additional 800,000 gallon storage reservoir onsite at the WRF, and a 500,000 gallon storage
reservoir on the Cal Poly Campus. The pipelines to serve Cal Poly would extend from the WRF
along Highway 101 right-of-way to California Blvd. to cal Poly Campus.
Following the evaluation of the physical systems necessary to deliver water under the five
alternatives, life cycle cost estimates were prepared for each alternative. The life cycle costs (LCC)
include capital costs and operation and maintenance costs. The present value of O&M costs is
based on an amortization of 30 years at an interest rate of 6 percent. The capital, O&M (present
worth)and total life cycle cost for each alternative are shown in Table 1 below:
Table 1: Life Cycle Cost Comparison
Cost Alternative
Category A-1 A-2 B C D
Construction $4,344,000 $4,480,000 $5,823,000 $4,781,900 $598949000
O&M $578,000 $596,000 $845,000 $771,000 $7319000
(present worth)
TOTAL $4,922,000 $5,076,000 $6,668,000 $5,552,900 $6,625,000
Q - 3
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Council Agenda Report—Water Reuse Master Plan
Page 4
Recommended Alternative
Staff and our consultants evaluated the various alternatives and a consensus was reached relative to
the preferred alternative that should be recommended to the City Council. The preferred alternative
was selected based on consideration of capital costs, environmental issues, long term operation
costs and ability to phase the construction and related costs over a number of years. Based on this
analysis, a hybrid alternative of Alternatives A-1 and A-2 was identified as discussed below.
The recommended Alternative (Attachment 7) expands the Phase I distribution system in a single
pressure zone and does not supply Cal Poly. Alternatives A-1 and A-2 supply the same users,
but Alternative A-1 provides future storage capacity at an additional WRF clearwell and
Alternative A-2 constructs a new reservoir in the distribution system. The recommended
alternative locates the reservoir storage at the WRF, but incorporates the distribution system
pipelines of Alternative A-2. The recommended distribution system provides increased pipeline
phasing opportunities over the previous alternatives. There is also the potential to supply
existing cemeteries along Higuera Street, which are now irrigated with well water.
Implementation Strategy
The market assessment identified numerous potential recycled water users in the southern portion
of the city that can be served from the Phase 1 distribution system. Since there are opportunities
near the existing system, northerly expansion of the system may not be warranted for many years.
Incremental annual projects to provide user site modifications necessary to utilize recycled water
would be the recommended strategy for expanding the use of the available recycled water in the
near term.
The Capital Improvement Plan of the 2003-05 Financial Plan identified$250,000 in 2005-06 and
2006-07 for implementation/expansion of the Water Reuse Project. The strategy would be to
fund level expenditures each year and add new users from the existing Phase 1 facilities.
Following project completion, new user sites would be evaluated to determine the opportunity
and cost necessary to use recycled water for irrigation purposes. Over the years, use would
continue to be increased off the existing system until such point that no additional sites are
available or are deemed not cost beneficial to retrofit. At that point, the Council could decide to
proceed with additional expansion of the system to northern areas of the city. The funding levels
identified above will likely be adjusted based on experience gained during the first several years
of the program.
Environmental Documentation
The Community Development Department has prepared an Addendum to the Water Reuse
Project Environmental Impact Report (Attachment 1). The addendum was prepared to document
minor technical changes or additions that have occurred in the project description since the Final
EIR was originally prepared. Staff recommends that the Council consider the addendum in its
consideration of the Water Reuse Master Plan and find that the preparation of a Supplemental
EIR is not necessary because:
Council Agenda Report—Water Reuse Master Plan
Page 5
None of the circumstances included in Section 15162, which require a subsequent EIR, have
occurred, specifically:
a. The project changes do not result in new or more severe environmental
impacts.
b. The circumstances under which the project is undertaken will not require
major changes to the EIR.
C. There is not a need to modify previously approved mitigation measures.
FISCAL IMPACT
There is no immediate fiscal impact associated with this report and the recommended action.
Funding to support expansion of system users and the distribution system will be identified in
future budgets for Council consideration and approval.
ATTACHMENTS
1. Addendum to Water Reuse Project EIR Certified by City Council on March 25, 1997
2. Alternative A-1
3. Alternative A-2
4. Alternative B
5. Alternative C
6. Alternative D
7. Recommended Alternative
AVAILABLE FOR REVIEW IN THE COUNCIL OFFICE
1. Final Water Reuse Master Plan, July 2004, prepared by Dudek and Associates
2. Final Environmental Impact Report, Water Reuse Project, March 1997
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i
Attachment 1
Addendum to Water Reuse Project EIR
Certified by City Council on March,25,1997
(SCH No. 92031048)
1. Project Title:
City of San Luis Obispo Water Reuse Project
2. Lead Agency Name and Address:
City of San Luis Obispo
990 Palm Street
San Luis Obispo, CA 93401
Pamela Ricci, Senior Planner
(805) 781-7168
3. Project Contact Person and Phone Number:
Gary Henderson, Water Division Manager
(805) 781-7237
4. Project Location:
Water reclamation property at 35 Prado Road for certain base facilities
and various City streets and other right-of-way for distribution lines.
S. Project Sponsor's Name and Address:
City of San Luis Obispo Utilities Department
879 Morro Street
San Luis Obispo, CA 93401
6. Previous Environmental Review
On March 25, 1997, the City Council certified a Final Environmental
Impact Report (EIR) for the Water Reuse Project. A Notice of
Determination was filed with the County Clerk on September 11, 2000.
Section 15164 of the CEQA Guidelines allows a lead agency to prepare
an addendum to a previously certified EIR if "some changes or additions
are necessary" but none of the conditions included in the Guidelines,
which require the preparation of a new EIR, have occurred. This
addendum has been prepared consistent with Section 15164 to document
why the potential environmental impacts of the updated information in the
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Addendum to Final EIR'for the City`s Water Reuse Project Attachment 1
Page 2
Water Reuse Master Plan is consistent with the prior analysis included in
the March 1997 Water Reuse Project EIR.
7. Project Description:
The City Water Reuse Project involves the construction of treatment
equipment, pipelines, pump stations, and water storage facilities
necessary to distribute reclaimed water to customers in the San Luis
Obispo area. The project is intended to meet the non-potable water needs
of certain large volume customers, with the potential in the future to also
serve small volume users. The most common use of the reclaimed water
will be for irrigation. Some of the selected large volume users include City
parks, common areas in residential developments, commercial
landscaping, schools, and cemeteries. An added benefit of the project is
the improvement in the water quality of San Luis Obispo Creek by
reducing the quantity of effluent, and therefore the pollution load,
discharged by the Water Reclamation Facility.
A Facilities Map, Figure 2-1 in the Final EIR (attached), showed the
construction of pipelines that would reach Cal Poly to the north and serve
other large volume users like San Luis Obispo High School, Sinsheimer
Park and Laguna Lake Park. Dudek & Associates recently completed a
Water Reuse Master Plan (WRMP) for the City dated July 2004. The
WRMP provides a strategic framework for expanding use of recycled
water in the City and provides a preferred alternative in terms of facilities
and distribution lines.
At the design level, environmental input is used to avoid known sensitive
resources for the location of the distribution facilities. With respect to
distribution pipelines, the design team has almost exclusively selected
developed roadway corridors for the placement of these components.
This approach takes advantage of existing right-of-way easements,
provides the best access for long-term maintenance, and tends to avoid
environmental resources. Section 6 of the WRMP evaluates various
system expansion alternatives. Section 7 of the WRMP includes the
recommended distribution system, which is depicted on the attached
Figure 7-1. This is the current preferred alternative. However, as specific
engineering plans are developed for the actual distribution lines, routing
preferences may change.
ENVIRONMENTAL FACTORS POTENTIALLY AFFECTED:
Since March of 1997 the project has been under design and is now completing
the first phase of pipeline construction in the southern portion of the City, as well
a - �
Addendum to Final EIR for the City's Water Reuse Project Attachment 1
Page 3
as improvements at the Water Reclamation Facility. In reviewing the certified
EIR, the bulk of the environmental issue area discussion focused on the strategy
of using reclaimed water for maintaining San Luis Obispo Creek habitat. The
focus of the WRMP is the distribution system.
The amended Project Description is the preferred alternative in the WRMP.
Comparing Figure 2-1 from the March 1997 Water Reuse Project EIR with Figure
7-1 from the WRMP, the two configurations of distribution systems are
substantially the same in terms of utilizing roadways and other rights-of-ways to
serve potential customers. The preferred alternative depicted in the WRMP is
actually somewhat smaller in scope in that it does not show a distribution line
extending to Cal Poly. The most important factor in determining that the new
information constitutes an insignificant change and that the evaluation done in
the certified EIR is still applicable is that the same construction methods
evaluated in the EIR continue to apply.
The issue areas previously evaluated that are impacted by pipeline construction
include:
1. Geology—disruption of soil from excavation.
2. Air Ouality - temporary increase in dust and emissions due to
construction activity.
3. Transportation temporary disruption to traffic flow due to
construction activity.
4. Noise—temporary noise from project construction.
5. Cultural Resources — potential disturbance or disruption of
archaeological or historical resources during project construction.
None of the mitigation measures included in the EIR for the above-noted
construction impacts are altered by the current preferred alternative plan for
routing the pipelines. As with all City Capital Improvement Projects, the detailed
engineering plans for the pipelines themselves will be evaluated for potential
environmental impacts. Depending on the specific information included in plans,
another initial study may need to be prepared unless a determination can be
made to file a Notice of Exemption.
DETERMINATION
The City of San Luis Obispo has determined that this addendum to the Final
Environmental Impact Report (EIR) for the Water Reuse Project is necessary to
document minor technical changes or additions that have occurred in the project
description since the Final EIR was originally prepared. The City Council has
reviewed and considered the information contained in this addendum in its
consideration of the Water Reuse Master Plan, and finds that the preparation of a
Supplemental EIR is not necessary because:
a-g
Addendum to Final EIR for the City's Water Reuse Project Attachment 1
Page 4
1. None of the circumstances included in Section 15162, which require a
subsequent EIR, have occurred, specifically:
a. The project changes do , not result in new or more severe .
environmental impacts.
b. The circumstances under which the project is undertaken will
not require major changes to the EIR.
C. There is not a need to modify previously approved mitigation
measures.
Attached: Facilities Map, Figure 2-1 in the Final EIR
Recommended Distribution System, Figure 7-1 in the WRMP
L:\ER\Addendum to Water Reuse EIR
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Attachment 1
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LEGEND
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LEGEND
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DATE: DEC. '03AvaoaATM LM
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LEGEND
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DATE: APR '04