HomeMy WebLinkAbout03-21-2017 - Council Reading File - RWMPCity of San Luis Obispo
2017 Recycled Water Master Plan
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Table of Contents
Terminology ......................................................................................................................... iv
Abbreviations & Acronyms .......................................................................................................... vi
Executive Summary ............................................................................................................... 1
Chapter 1. Introduction ......................................................................................................... 3
Master Plan Scope ....................................................................................................................... 3
Chapter 2. Policy Framework and Program History ................................................................ 5
Statewide Policy Framework ....................................................................................................... 5
Statewide Goals for Expanded Recycled Water Use ............................................................... 5
Conservation, a California Way of Life .................................................................................... 5
Potable Reuse Options ............................................................................................................ 5
Local Plans and Policies ............................................................................................................... 6
Municipal Code ........................................................................................................................ 6
General Plan Goals and Policies .............................................................................................. 7
2015 Urban Water Management Plan .................................................................................... 8
2012 Climate Action Plan ........................................................................................................ 8
Master Reclamation Permit ..................................................................................................... 9
2005 Biological Opinion ........................................................................................................... 9
Water Resource Recovery Facility Project............................................................................. 10
2004 Master Plan ................................................................................................................... 11
Chapter 3. Existing Recycled Water Distribution System and Demand .................................. 13
Construction Water Demand .................................................................................................... 17
Chapter 4. Strategic and Beneficial Use of Recycled Water ................................................... 22
Factors Influencing Availability and Demand of Recycled Water ............................................. 22
Recycled Water Supply Assumptions .................................................................................... 22
Recycled Water Demand Assumptions ................................................................................. 23
Deliveries to Irrigation Customers ............................................................................................ 23
Irrigation Demand in 2015 ..................................................................................................... 23
Irrigation Demand at Buildout ............................................................................................... 24
Alternative Uses of Recycled Water .......................................................................................... 25
Recycled Water Use Outside of the City ............................................................................... 26
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Indirect Potable Reuse (IPR) .................................................................................................. 27
Direct Potable Reuse ............................................................................................................. 28
Laguna Lake ............................................................................................................................... 29
Dual Plumbing ........................................................................................................................... 29
Chapter 5. Future Recycled Water Use for Landscape Irrigation............................................ 30
Pending Projects/Approved Accounts ...................................................................................... 30
Use of Recycled Water in Specific Plan Areas ........................................................................... 31
High-Priority Retrofit Projects ................................................................................................... 31
Medium-Priority Irrigation System Retrofit Projects ................................................................ 36
Low Priority Irrigation System Retrofit Projects ....................................................................... 40
Chapter 6. Recycled Water Storage ...................................................................................... 42
Chapter 7. Capital Improvement Plan .................................................................................. 45
Past Capital Investment ............................................................................................................ 45
Future Capital Investment ......................................................................................................... 45
Recycled Water Distribution System Projects ....................................................................... 46
Irrigation System Retrofit Project Cost Estimates ................................................................. 46
Documents Referenced ....................................................................................................... 48
Appendix A. Recycled Water Facilities Planning Study ......................................................... A-1
Appendix B. Recycled Water to Augment Lake Level at Laguna Lake ................................... B-1
Appendix C. Storage Analysis .............................................................................................. C-1
Appendix D. High Priority Irrigation System Retrofit Projects .............................................. D-1
Appendix E. Medium Priority Projects ................................................................................. E-1
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List of Tables
Table 1. Metered Recycled Water Irrigation Account Expansion, 2006 to 2016 ......................... 16
Table 2. Construction Use of Recycled Water, 2014 to 2016 ....................................................... 17
Table 3. Recycled Water Demand and Availability, Calendar Year 2015 ..................................... 24
Table 4. Future (Buildout) Monthly Recycled Water Demand with High and Medium Projects . 25
Table 5. Estimated Short-term Recycled Water Surplus by Month ............................................. 26
Table 6. Estimated Long-term Recycled Water Surplus by Month .............................................. 27
Table 7. Estimated Recycled Water Demand from Pending Projects .......................................... 30
Table 8. Recycled Water Demand Estimate for Specific Plan Areas ............................................ 31
Table 9. High-Priority Irrigation System Retrofit Projects ............................................................ 33
Table 10. Medium-Priority Irrigation System Retrofit Projects .................................................... 37
Table 11. Low-Priority Irrigation System Retrofit Projects ........................................................... 40
Table 12: Recycled Water Capital Plan ......................................................................................... 47
List of Figures
Figure 1. One Water Approach ..................................................................................................... 11
Figure 2. Recycled Water Service Area ......................................................................................... 14
Figure 3. Existing (2016) Recycled Water Customers ................................................................... 18
Figure 4. Recycled Water System Expansion (2006-2015) ........................................................... 20
Figure 5. High-Priority Irrigation System Retrofit Projects ........................................................... 34
Figure 6. Medium-Priority Irrigation System Retrofit Projects..................................................... 38
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Terminology
Acre-foot: The volume of one acre of surface area to a depth of one foot. Since the acre is defined as a
chain by a furlong (66 ft × 660 ft) the acre-foot is exactly 43,560 cubic feet. In San Luis Obispo in 2016, one
acre-foot is the water usage of approximately six single-family households, annually.
Creek Discharge: As a condition of approval of the Water Reuse Project in 2005, the City was required by
National Oceanic and Atmospheric Administration, National Marine Fisheries Service to maintain a
minimum average daily release, year-round, of treated effluent to San Luis Obispo Creek at a rate of 2.5
cubic feet per second (cfs), or 1.6129 million gallons per day (mgd) to provide satisfactory habitat and flow
volume for anadromous fish species (steelhead trout) within the San Luis Obispo Creek environment.
Direct Potable Reuse (DPR): The planned introduction of advanced purified water either directly into a
public water system, as defined in Section 116275 of the Health and Safety Code, or into a raw water
supply immediately upstream of a water treatment plant.
Indirect Potable Reuse (IPR): Indirect potable reuse is the planned use of advanced purified water for
replenishment of a groundwater basin or an aquifer that has been designated as a source of water supply
for a public water system.
One-Water: The One-Water approach considers the urban water cycle as a single integrated system, in
which all urban water flows are recognized as potential resources, and the interconnectedness of water
supply, groundwater, stormwater and wastewater is optimized, and their combined impact on flooding,
water quality, wetlands, watercourses, estuaries and coastal waters is recognized.
Potable or Drinking Water: Potable water is water that meets the Environmental Protection Agency (EPA)
Safe Water Drinking Act and California Water Code requirements. Residents and businesses receive
potable water at their water meter connection, and its use is unrestricted.
Recycled Water: Recycled water means water which, as a result of treatment of waste, is suitable for a
direct beneficial use or a controlled use that would not otherwise occur and is therefore considered a
valuable resource. (Water Code § 13050(n)).
Surplus Recycled Water: The quantity of recycled water available beyond the City’s required creek
discharge and the quantity of recycled water delivered for landscape irrigation is described as the
“Seasonal Surplus” as it is available outside of the irrigation season.
Title 22: Wastewater recycling is regulated under Title 22, Division 4 of the California Code of Regulations.
These regulations establish the treatment and water quality requirements for recycled water to varying
levels, as well as establish types of uses that are allowed for each level. The State Water Resources Control
Board (SWRCB) has jurisdiction over recycled water use and enforcement of Title 22 regulations.
Wastewater: Wastewater comes from homes or businesses and has been polluted to the point of
requiring special management and treatment. In the City, wastewater is collected and treated at the
Water Resource Recovery Facility. Some of the City’s wastewater is recovered as recycled water.
Wastewater does not include stormwater in San Luis Obispo. Stormwater is collected in a separate system
of pipes and typically not treated before discharge.
Water Resource Recovery: Water resource recovery is a broad term used to describe the process of
converting wastewater to a valuable water resource through treatment processes. Water resource
recovery includes non-potable recycled water development and either direct potable reuse or indirect
potable reuse involving integration with drinking water supplies.
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Abbreviations & Acronyms
AF - Acre-Foot or Acre-Feet
AFY (of afy) - Acre-Feet per Year
AWWA - American Water Works Association
CDPH - California Department of Public Health
CIMIS - California Irrigation Management Information System
CUWCC - California Urban Water Conservation Council
CWC - California Water Code
DDW - State Water Resources Control Board, Division of Drinking Water
DOF - Department of Finance
DPR - Direct Potable Reuse
DWR - California Department of Water Resources
EPA - U.S. Environmental Protection Agency
ETo - Reference Evapotranspiration
GIS - Geographic Information System
GPCD (or gpcd) - Gallons per Capita per Day
IPR - Indirect Potable Reuse
IRWM - Integrated Regional Water Management
LAFCO - Local Agency Formation Commission
MGD (or mgd) - Million Gallons per Day
NOAA NMFS - National Oceanic and Atmospheric Administration, National Marine Fisheries
Service
NPDES - National Pollutant Discharge Elimination System
PRV - Pressure Reducing Valve
RWMP - Recycled Water Master Plan
RWQCB - Regional Water Quality Control Board
SB X7-7 - Senate Bill Seven of the Senate’s Seventh Extraordinary Session of 2009
SDWA - Safe Drinking Water Act
SGMA - Sustainable Groundwater Management Act
SWRCB - State Water Resources Control Board
UWMP - Urban Water Management Plan
WDR - Waste Discharge Requirement
WRRF - Water Resource Recovery Facility. The WRRF is the City’s wastewater treatment facility.
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City of San Luis Obispo
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Executive Summary
The City of San Luis Obispo has been utilizing recycled water as a component of its multi-source
water supply since 2006. The City’s goal is to use this water source to the highest and most
beneficial use and is committed to sound and progressive planning for its recycled water
infrastructure.
The main purpose of the City’s Master Plan in 2004, originally called the Water Reuse Master
Plan, was to offset potable water use by reducing the need to use potable water for non-potable
uses. While the City continues to deliver recycled water for landscape irrigation, technology and
regulations have evolved and other opportunities for utilization of recycled water have emerged.
The 2017 Recycled Water Master Plan describes future opportunities for the City to consider
potable reuse consistent with a One-Water approach, presents a plan to serve recycled water to
developing areas of the community for use as landscape irrigation, prioritizes opportunities to
retrofit existing sites to offset potable water use, and explores use of recycled water outside the
City limits during periods where much of the City’s recycled water supply goes underutilized. The
Master Plan includes an updated storage analysis and a capital plan through 2035.
The 2017 Master Plan is organized into the following seven chapters:
Chapter 1 provides an introduction to the 2017 Recycled Water Master Plan.
Chapter 2 provides a summary of State regulations and local recycled water policy
framework and describes changed conditions since adoption of the 2004 Master
Plan.
Chapter 3 describes the existing recycled water distribution system and demand.
Chapter 4 summarizes alternatives considered to maximize use of the City’s
available recycled water supply.
Chapter 5 provides a plan for the continued logical expansion of the City’s recycled
water distribution system.
Chapter 6 describes existing recycled water storage and future storage needs
Chapter 7 includes the capital plan for the expanded use of recycled water.
Five appendices to the 2017 Master Plan are provided with detailed analysis that supports the
City’s water management goals.
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Chapter 1. Introduction
Population growth and climate change are leading cities to further consider methods of
sustainable development and management. Recycling treated wastewater is a strategy being
utilized around the world to meet and manage urban water demands. Rec ycling water involves
altering the traditional municipal pathway from the wastewater treatment facility to the
discharge point, and treating it sufficiently to reuse for either non-potable or potable
applications. As opposed to treating and discharging, recycling treated wastewater is a more
sustainable practice. By recycling water through potable reuse, cities could extend or create an
additional municipal supply, also reducing demand on the City’s potable water resources. By
recycling water for landscape irrigation, policy makers ensure reduced consumption of potable
water, thereby conserving availability of freshwater sources.
In accordance with the City’s General Plan, the City intends to use recycled water to the highest
and most beneficial use today and into the future. To effectively manage this resource, the City
must have a solid understanding of evolving State water regulations, production capability, cost,
and existing and future water demands and demand patterns. This Master Plan presents a plan
to serve recycled water to developing areas of the community for use as landscape irrigation,
presents opportunities to retrofit existing sites to offset potable water use, explores use of
recycled water outside the City limits during periods where much of the City’s recycled water
supply is underutilized, and describes future opportunities for the City to consider potable reuse
consistent with a One-Water approach.
Master Plan Scope
The 2017 Recycled Water Master Plan is part of a comprehensive strategy to efficiently manage
the City’s water resources. The scope of the Master Plan work effort is as follows:
1. Plan for the strategic and beneficial use of recycled water, including the potential for future
potable reuse.
2. Analyze recycled water production capability in the short- and long-term, ensuring the
Master Plan reflects current wastewater generation rates.
3. Understand the City’s expected growth patterns and recycled water demand.
4. Develop a hydraulic model for the recycled water distribution system that can be utilized for
future infrastructure analysis.
5. Analyze the available recycled water supply, including surplus supply.
6. Confirm the long-term extent of the Master Plan area.
7. Provide a plan for incremental expansion of the recycled water distribution system.
8. Prioritize future retrofit opportunities based on defined criteria.
9. Identify future storage needs based on future peak day demand.
10. Evaluate infrastructure improvements needed to reach new customers and a prioritized
Capital Improvement Project (CIP).
The Master Plan covers the planning period to the year 2035 consistent with development
projections in the City’s General Plan.
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Recycled water means water which, as a result
of treatment of waste, is suitable for a direct
beneficial use or a controlled use that would not
otherwise occur and is therefore considered a
valuable resource.
Water Code § 13050(n)
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Chapter 2. Policy Framework and Program History
This chapter summarizes State and local recycled water policy framework, discusses the history
of the City’s recycled water program, and describes changed conditions since adoption of the
2004 Master Plan.
Statewide Policy Framework
Since the City adopted its 2004 Master Plan and began delivering recycled water for landscape
irrigation in 2006, State water regulations related to recycled water use have continued to evolve
in a number of areas. These regulations involve expanding recycled water use, new water use
efficiency requirements, and the treatment of wastewater to drinking water standards.
Statewide Goals for Expanded Recycled Water Use
On February 3, 2009, the State Water Resources Control Board adopted a Recycled Water Policy
for California and statewide goals for expanded use of this valuable resource. The policy identifies
the goals and mandates to recycled water by 2010, 2015 and 2030. Section 13577 of the
California Water Code establishes water recycling goals of 700,000 acre feet of water per year by
the year 2000 and 1,000,000 acre-feet of water per year by the year 2010.
Conservation, a California Way of Life
On May 9, 2016 the Governor released Executive Order (B-37-16) which established a new water
use efficiency framework for California by aiming to “Make Conservation a California Way of
Life.” The 2016 Executive Order bolsters the state’s drought resilience and preparedness by
establishing long-term water conservation measures that include:
Permanent monthly water use reporting,
New urban water use targets based on strengthened standards,
Reducing system water loss,
Eliminating clearly wasteful practices, and
Strengthening urban drought contingency plans.
These updated measures aim to not only reduce water use in the short-term but to establish a
long-term change in the way Californians think about water. The drought across the State of
California, and specifically in the Central Coast region, has contributed to a heightened interest
in the City’s recycled water supply.
Potable Reuse Options
In 2010, then-Governor Arnold Schwarzenegger signed a bill that in part required the California
Department of Public Health (CDPH) to investigate the feasibility of developing uniform water
recycling criteria for direct potable reuse. Direct potable reuse, or DPR, is the planned
introduction of recycled water either directly into a public water system, as defined in Section
116275 of the Health and Safety Code, or into a raw water supply immediately upstream of a
water treatment plant. Direct potable reuse is a practice which is not currently occurring in
California; however, the feasibility of implementing direct potable reuse is being drafted.
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Indirect potable reuse, or IPR, is a practice that occurs when tertiary or advanced treated
wastewater augments drinking water resources. The two types of indirect potable reuse are:
• Indirect potable reuse for groundwater recharge ‐ where recycled water recharges a
groundwater basin and groundwater is later extracted from the basin.
• Surface water augmentation – where recycled water is added into a surface water
reservoir used as a source of domestic drinking water supply.
Indirect potable reuse does not actually occur until the water is subsequently pumped from the
ground or withdrawn from the reservoir, treated, and added to the drinking water distribution
system.
Indirect potable reuse through groundwater recharge has occurred in California since 1962. Title
22, Division 4, Chapter 3, Article 5.1 (CCR §60320 et seq), effective June 18, 2014, describes the
permitting and monitoring process required to obtain a Regional Water Quality Control Board
(RWQCB) permit for groundwater recharge. Indirect potable reuse through surface water
augmentation is not currently permitted in California, but regulations are being drafted. Like
groundwater recharge with recycled water, surface water augmentation will only occur with a
permit and monitoring requirements from a RWQCB.
Local Plans and Policies
Water recycling has been part of the overall water supply strategy in the City since the 1980s. In
1994 the City completed a major capital improvement project at its Water Resource Recovery
Facility (WRRF) that included addition of tertiary treatment and other unit processes required to
meet stringent effluent quality limits intended to protect and enhance the receiving waters of
San Luis Obispo Creek. The City received regulatory approvals for diversion of treated effluent
for off-site landscape irrigation and other approved uses in 2002. In 2004, the City’s Water Reuse
Master Plan analyzed alternative distribution system routes, identified areas of the City to be
served with recycled water, and anticipated future recycled water demand.
Municipal Code
The City adopted a mandatory use ordinance for recycled water in 2004. The policy, codified in
the Municipal Code as Chapter 13.24, allows the City to require the use of recycled water on
parcels when considered feasible. The code language is as follows:
13.24.010 Statement of Policy
When in the judgment of the city, reclaimed water service can be feasibly provided
to a particular parcel for particular uses, the utilities director shall require the use
of reclaimed water in lieu of potable water for those uses. As used herein, the term
“feasible” means reclaimed water is available for delivery to the property in
compliance with all applicable federal, state, and local laws, ordinances and
regulations and such reclaimed water can be delivered to the property at an overall
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cost to the user which does not exceed the overall cost of potable water service
(Ord. 1403 § 1,2001).
The mandatory use ordinance is an important component of the City’s recycled water program
as small volume users are ultimately expected to make up a significant portion of the City’s overall
recycled water demand for irrigation use.
General Plan Goals and Policies
The City’s Water and Wastewater Management Element of the General Plan, or WWME, has
been the guiding policy document for the provision of water and wastewater services to the
community since 1987. The Element translates the Land Use Element's capacity for development
into potential demand for water supply and wastewater service. The WWME Element identifies
multiple water sources to meet projected short and long-term water demand. Having several
sources of water avoids dependence on any one source that may not be available during a
drought or other water supply reduction or emergency. There is usually greater reliability and
flexibility if sources are of different types (such as surface water and groundwater) and if the
sources of one type are in different locations (such as reservoirs in different watersheds).
Consistent with the multi-source concept, the City obtains water from five sources: Salinas
Reservoir (Santa Margarita Lake), Whale Rock Reservoir, Nacimiento Reservoir, recycled water
from the City’s Water Resource Recovery Facility, and groundwater.
When the 2004 Master Plan was adopted, the City’s General Plan had established a buildout
population of 56,000 with an equivalent potable water demand of nearly 9,100 acre feet per
year. The City had a water supply deficit of approximately 1,800 acre-feet per year at the
projected buildout. The City was considering a number of potential water supply projects to meet
the projected demand including a recycled water program and participation in the Nacimiento
Water Project. When recycled water deliveries began in 2006, it was the first new water supply
project developed by the City in 40 years. The 2004 Master Plan saw the use of recycled water as
a method to offset potable water use and extend the City’s potable water supply to serve General
Plan buildout.
The City adopted an updated WWME in June 2016. With that update, the City’s goal (7.1.1) for
the utilization for its recycled water supply was broadened to read as follows:
Maximize recycled water use for all approved purposes.
The 2017 Master Plan presents opportunities to maximize non-potable recycled water use and
future potable reuse opportunities. It describes the existing non-potable recycled water
distribution system and expansions through 2035, and identifies potential long-term non-potable
recycled water distribution system expansion concepts.
Deliveries of recycled water outside the City limits is addressed in two areas of the General Plan.
The 2014 General Plan Land Use Element update included a new policy and specific findings
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related to potential recycled water deliveries outside the City limits. Related to Annexation and
Services, Policy 1.13.2 states the following:
Provision of recycled water outside of City limits may only be considered in
Compliance with Water and Wastewater Element Policy A 7.3.4 and the
following finding:
A. Non-potable/recycled water is necessary to support continued
agricultural operations.
B. Provision of non-potable/recycled water will not be used to increase
development potential of property being served.
C. Non-potable/recycled water will not be further treated to make it
potable.
D. Prior to provision of non-potable/recycled water, the property to be
served will record a conservation, open space, Williamson Act, or other
easement instrument to maintain the area being served in agriculture
and open space while recycled water is being provided.
The WWME includes Program A 7.3.4, which states that the City should:
Consider the potential to deliver available recycled water supplies to customers
outside the city limits, including analysis of policy issues, technical concerns, and
cost recovery, provided it is found to be consistent with the General Plan.
The 2017 Master Plan addresses deliveries outside the city limits in more detail in Chapter 3.
2015 Urban Water Management Plan
Chapter 5 of the City’s 2015 Urban Water Management Plan was
prepared to fulfill the requirements of Section 10633 (a-g) of
California Water Code Division 6, Article 2, Part 2.6 regarding the
City’s recycled water supply.
In this document the City made conservative estimates that
future recycled water use for landscape irrigation and
construction water would reach 350 acre feet per year by 2035.
2012 Climate Action Plan
The goal identified in the City’s 2012 Climate Action Plan (CAP)
related to water is to reuse water consumed by the community.
The CAP includes implementation measure WTR 1.3 to
“encourage the use of recycled water, greywater or rainwater-
harvesting systems” and notes that:
Recycled Water Uses
Landscape Irrigation
Mandatory Use
Ordinance adopted in
2004
Deliveries began in 2006
Construction Water
Permit program began
in 2009
Sale of Seasonal Surplus
Under Study
Potable Reuse
Under Study
Pending New Statewide
Regulations
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The use of recycled water for non-potable needs directly reduces drinking water
demand and conserves water resources. The City will continue to implement the
[Recycled Water] Master Plan to utilize the capacity of recycled water when available.
Continued implementation of the Recycled Water Master Plan will help the City meet its Climate
Action Plan goals.
Master Reclamation Permit
Production and distribution of tertiary treated recycled water is regulated under the City’s
existing Waste Discharge Requirements/Master Reclamation Permit (Order No. R3-2003-081).
The Permit outlines prohibitions, requirements for construction and irrigation use, and a
monitoring program for use of recycled water. In accordance with this Permit, the City complies
with the following:
1. Meter the total quantity of reclaimed
water distributed daily,
2. Monitor and record chlorine residual
concentration at a point after the final
chlorine contact basin,
3. Provide guidance to recycled water
users including a user manual and
other guidance as needed,
4. Provide instruction to all City field staff
to report incidents of unauthorized
daytime irrigation activity or runoff,
5. Cooperate with County Environmental Department of Health Services to ensure backflow
devices are present, tested and repaired or replaced if found defective,
6. Inspect the operation of reuse sites,
7. Perform cross connection testing,
8. Conduct site supervisor training and quarterly interviews to verify system operation, and
9. Quarterly review of monthly meter readings with follow-up on change in patterns of use.
The entirety of the recycled water treated at the WRRF is compliant with Title 22 requirements,
but only a portion is currently used. The remainder is discharged to San Luis Obispo Creek. The
available seasonal surplus of recycled water is described further in Chapter 3.
2005 Biological Opinion
In addition to complying with the permit requirements described above, the City is required to
comply with minimum daily average discharge requirements from the WRRF to San Luis Obispo
Creek for protection of downstream biological resources as required by National Oceanic
Atmospheric Association, National Marine Fisheries Service (NOAA NMFS).
The City’s 2004 Master Plan noted that the City must discharge a minimum of 1.7 cubic feet per
second (cfs), equivalent to 1.1 MGD, to San Luis Obispo Creek at all times to provide satisfactory
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habitat and flow volume for anadromous fish species within the creek environment. However, in
2005 the NOAA NMFS amended the Biological Opinion for the City’s Water Reuse Project to a
minimum daily average year-round discharge of 1.6129 MGD (or 2.5 CFS). This change reduced
the City’s total available recycled water supply by over 500,000 gallons a day. Operationally, this
requirement may lead to other challenges during periods where the Water Resource Recovery
Facility receives low flows. The City may work to reduce the mandatory discharge requirement
to balance competing needs for recycled water in the future consistent woth the One-Water
approach.
Water Resource Recovery Facility Project
The design phase for the upgrade of the City’s
WRRF began in 2016 and will allow the City to
accommodate General Plan buildout and
maximize recycled water production. The
proposed project will meet more stringent
standards of the City’s 2014 NPDES permit (Order
No. R3-2014-0033) which will improve the quality
of recycled water that would be distributed to
customers. The WRRF upgrade will also enable the
City to consider potable reuse, part of a One-
Water approach (See Figure 1), in the future.
Completion of the upgrade is anticipated to occur
in 2021.
The Environmental Impact Report for the Water Resource Recovery Facility Project states:
The proposed project would upgrade the WRRF facility to meet performance
standards and be in compliance with the State Water Resources Control Board
discharge requirements. The project would include increasing the facility’s capacity
to produce recycled water, as well as upgrading and replacing aging infrastructure.
The proposed project would increase the amount of recycled water available for
use within the City of San Luis Obispo, which is one of the GHG reduction strategies
outlined in the CAP.
Also, the use of recycled water in place of imported, offset, at least partially, the energy
requirements to deliver the same amount potable water supplies would of water from outside
sources.
WRRF Community Open House at the
San Luis Obispo Farmer’s Market on March 19, 2015
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FIGURE 1: One-Water Approach
2004 Master Plan
The City adopted the 2004 Master Plan on September 21, 2004. In the 2004 Master Plan, the City
estimated that demand existed for over 1,000 acre-feet of recycled water annually. The 2004
Master Plan was a plan to deliver recycled water for landscape irrigation to the Orcutt, Margarita,
and Airport Specific Plan areas, as well as retrofits of existing irrigation systems using potable
water to use recycled water.
The One-Water approach considers the urban water cycle as a single integrated system, in
which all urban water flows are recognized as potential resources, and the
interconnectedness of water supply, groundwater, stormwater and wastewater is optimized,
and their combined impact on flooding, water quality, wetlands, watercourses, estuaries and
coastal waters is recognized.
SOURCE: US Water Alliance.
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The 2004 Master Plan included a groundwater exchange program concept whereby the City’s
recycled water supply would be exchanged for a potable ground water supply that was used to
irrigate agricultural land outside the City limits. This included both the Dalidio Groundwater
Exchange and the South Higuera Groundwater Exchange. Since that time, the City elected not to
pursue a groundwater exchange program.
A number of other factors have changed since the adoption of the 2004 Master Plan related to
water demand and wastewater generation. Per capita water demand is down from 1 26 gallons
per capita per day (gpcd) in 2004 to 92 gpcd in 2015. Correspondingly, the average daily and
monthly influent flows to the WRRF have also decreased since the 2004 Master Plan reported
the average flow as 4.5 mgd (a 2003 figure) to 2.74 mgd in 2015. This average daily flow is further
lowered during the summer months while the student population associated with Cal Poly is
away (mid-June to mid-September), thus reducing the available recycled water supply during the
peak irrigation season. The available recycled water supply and demand trends are described in
more detail in Chapter 3 and in Appendix C related to recycled water storage.
City of San Luis Obispo Multi-Source Water Supply
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Chapter 3. Existing Recycled Water Distribution System and Demand
The City completed construction of the Water Reuse Project in 2006 which included eight miles
of the recycled water distribution system with two main branches (see Figure 2).
West Branch: The west branch extends west from the W ater Resource Recovery
Facility under Highway 101, then along Calle Joaquin to Los Osos Valley Road to
near the westerly City limits. There is a secondary branch which extends from Los
Osos Valley Road along Madonna Road to Laguna Lake Park.
East Branch: The east branch begins at the Water Resource Recovery Facility and
follows Prado Road east to the City limits, then along existing easements to Broad
Street, south along Broad to Tank Farm Road, then east to the terminus at Islay
Hills Park.
The Water Reuse Project also included improvements within the Water Resource Recovery
Facility. These are:
A diversion structure and modulating control valve to split the effluent flow between the
recycled water tank and San Luis Obispo Creek.
A new 220,000-gallon chlorine contact tank to meet recycled water disinfection
requirements which differ from those for discharge to San Luis Obispo Creek.
A 600,000 gallon buried concrete recycled water storage tank to provide the storage
necessary for operation of the distribution system.
A pump station to deliver recycled water into the distribution system. It included two 40-
horsepower and three 120-horsepower variable speed pumps and was designed to
accommodate two additional 120 horsepower pumps for a future capacity expansion.
Recycled water delivery began in October, 2006 to a large City park, the Damon Garcia Sports
Complex. In 2016, the City delivered over 193 acre-feet of recycled water with over 40 metered
connections to the system. To date, the Damon Garcia remains as the City’s largest user of
recycled water.
Additional sites continue to be connected to the recycled water distribution system through
retrofits of existing irrigation systems as well as the irrigation systems associated with new
development in the master plan area. Recycled water is used for the irrigation of parks,
streetscape and median landscaping, common area (homeowner’s association) landscaping, and
landscaping in commercial centers, industrial areas, and business parks. There are currently 39
metered connections to the recycled water system that supply recycled water for irrigation use.
The recycled water service area is shown on Figure 2 and locations of the existing connections
and approved future connections can be found on Figure 3.
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City of San Luis Obispo
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Since the City’s original eight miles of recycled water main were installed for the water reuse
project, an additional 3.2 miles of main line have been installed to expand the system. Both the
east and west branch of the recycled water system have been expanded since 2004, leading to
an increased demand in recycled water for ten consecutive years.
As the recycled water system has expanded, existing customers currently served by potable
water have converted existing irrigation systems to recycled water. As shown in Figure 2,
segments of “dry” recycled water main have been installed in areas not yet served by recycled
water. The installation of “dry” pipe has been done in order to place the City in a position to
connect additional customers to recycled water as the system expands through capital projects
and expansion into several specific plan areas.
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Table 1: Metered Recycled Water Irrigation Account Expansion
2006 to 2016
East/West
Branch Irrigation Accounts Year
Connected
New
Construction (N)
or Retrofit (R)?
West Los Osos Valley Road Medians 2006 R
West Courtyard by Marriott 2006 N
East Damon Garcia Park 2006 N
West Laguna Middle School 2007 R
West Laguna Village Shopping Center 2007 R
West Costco 2007 N
West Irish Hills Plaza West 2007 N
West Calle Joaquin Parkways 2007 N
West Laguna Lake Golf Course 2008 R
West Laguna Hills Park 2009 R
West Laguna Lake Park 2009 R
West Mission Community Bank 2009 N
West De Tolosa Ranch 2010 R
West DeVaul Ranch Park 2010 R
West Los Verdes I Home Owners Association 2010 R
East Meathead Movers 2010 N
East Margarita Medians 2010 R
East French Park 2010 R
East Islay Hills Park 2010 R
West Olive Garden 2011 N
West Irish Hills Plaza East 2011 N
West Hampton Inn 2012 N
West American Tire 2013 N
West Madonna Road Apartments 2014 R
East SESLOC Credit Union 2014 N
West Cal Trans 2009/2015 R
East Wathen Castano Homes 2015 N
Note: Properties may be supplied by multiple recycled water meters/connections.
Source: City of San Luis Obispo, Utilities Department, Cityworks database, 2017.
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Construction Water Demand
A portion of the City’s increase in recycled water use since 2014
has come from the use of recycled water for construction
activities. Since 1989, in accordance with the City’s Municipal
Code section 13.07.070 C 3:
Potable city water shall not be used for major
construction activities, such as grading
and dust control, and shall not be used to
wash down sidewalks, driveways, or parking
areas except to alleviate immediate fire or
sanitation hazards.
The presence of recycled water filling stations at various
locations in the City has reduced the demand on the Prado Road
well and other non-potable resources that were traditionally
used to supply water for dust control, grading and compaction
related to large construction projects. While the municipal code
does not require the use of recycled water for construction-
related activities, the City’s only publically accessible non-
potable well is no longer permitted as a source of water for
construction use. While construction water demand varies from
year-to-year, based on construction activity, weather, and a
variety of other factors, there is not a large future increase
expected in construction water use. Annual construction water
demand from 2014 to 2016 is provided in Table 2.
Table 2: Construction Use of Recycled Water
2014 to 2016
Source: City of San Luis Obispo,
Utilities Department, Springbrook
database, 2017.
As shown on Figure 2, in 2017 the City has six existing recycled water filling stations, and three
temporary locations in the Margarita and Orcutt specific plan areas. Additional filling stations are
planned in the future proximate to developing areas of the City. Locating recycled water filling
stations within the recycled water distribution system can reduce a significant number of truck
trips through the City.
Year Acre-Feet
2014 9.20
2015 17.56
2016 16.94
Wharf head-style hydrants are
provided at existing recycled
water filling stations.
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Chapter 4. Strategic and Beneficial Use of Recycled Water
The City’s goal is to use its available recycled water
supply to the highest and most beneficial use today
and into the future, which requires an understanding
of recycled water demand patterns. This chapter
examines factors that influence the supply of and
demand for recycled water, and summarizes
assumptions regarding increased demand for
recycled water over time for landscape irrigation use.
Also provided in this chapter is a detailed
examination of potable reuse opportunities, and
short- and long-term use of surplus water outside of
the City.
Factors Influencing Availability and
Demand of Recycled Water
A variety of factors influence future recycled water supply and demand. The supply and demand
assumptions explained below forecast a conservative baseline for wastewater generation and
recycled water irrigation demand. The City will update this analysis as new information becomes
available to help forecast the supply and demand of recycled water in the future.
Recycled Water Supply Assumptions
As the drought in California has highlighted the need for expansion and diversification of water
supplies across the state, it has also led to a reduction in indoor water use which has reduced
wastewater flows to the WRRF. Along with this reduction, the State is drafting legislation
(Executive Order B-37-16) which could further reduce wastewater generation rates by increasing
water efficiency standards for water-using fixtures and appliances. Improved water efficiency
standards, along with an increased awareness in water conservation, may lead to a continued
decrease in the water demand of new homes and businesses.
Applying what the City learned during the early 1990s when plumbing and appliance water
efficiency standards were last significantly lowered, the City may also see decreased water use
within the existing customer base. The amount of reduction will be dependent on the level of
water efficiency required by new standards and if state or local ordinances are enacted to require
replacement of existing fixtures with more efficient fixtures.
The City also made assumptions to develop the 2017 Master Plan related to construction
schedules and the future of potable reuse. Future recycled water supply projections are based
on the quantity of available recycled water during 2015, which represents a conservative baseline
year as wastewater flows were at a historic low. The City should make adjustments over time to
these supply assumptions as new information is available about water efficiency standards,
Irrigation
Use
Outside
City
Delivery
Direct
Potable
Reuse
Indirect
Potable
Reuse
City of San Luis Obispo
2017 Recycled Water Master Plan
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construction schedules, etc. These adjustments will ensure the City does not over allocate the
available recycled water supply.
Recycled Water Demand Assumptions
As most of the existing demand for recycled water is for landscape irrigation, weather influences
recycled water demand in the City. When the City enters wet or dry periods, demand for recycled
water may decrease or increase. In this study, the baseline period used to predict future recycled
water demand was calendar year 2015. This year was used as it is a conservative representation
of what demand may look like during periods of extended drought.
As described in Chapter 2, another factor that may influence future demand of recycled water is
City and State policy related to water conservation. In 2017, recycled water is not regulated by
water efficiency ordinances and state-mandated reduction requirements (such as SBx 7-7 and
the State’s emergency drought declaration). If the City elects to further pursue potable reuse
options, it may make sense to conserve all water resources. For the purposes of this study,
recycled water demand was examined as it is today, exempt from most conservation mandates
and requirements.
Deliveries to Irrigation Customers
Over the past ten years, the City has analyzed daily, monthly, and yearly irrigation trends, noting
that approximately 75 percent of recycled water demand occurs between May and October.
During the same time frame, recycled water production decreases due to reduced wastewater
generation related to the City’s reduced population during Cal Poly’s summer break.
Irrigation Demand in 2015
Table 3 shows calendar year 2015 monthly wastewater generation, required environmental
discharges, recycled water demand, surplus recycled water, and the percent of the available
supply utilized each month for irrigation and construction use. As shown, supply and demand
occur on an inverse schedule throughout the year, resulting in several months where there is
limited demand for recycled water but production is at its highest. In 2015, there were five
months where the City used less than ten percent of available recycled water due to limited
demand for landscape irrigation during these months.
Total
Wastewater
Generated
Environmental
Discharges
Irrigation &
Construction
Demand
Surplus
Recycled Water
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2017 Recycled Water Master Plan
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Table 3: Recycled Water Demand and Availability
Calendar Year 2015
Month
Total
Wastewater
Generated
(AF)
Environmental
Discharges
(AF)
2015 Demand
(AF)*
Surplus
Recycled
Water
(AF)
% of
available
RW used **
January 323.49 155.22 5.64 165.63 3%
February 327.62 137.49 5.05 185.08 3%
March 305.90 152.22 10.61 143.07 7%
April 307.73 147.31 16.89 143.53 11%
May 307.73 152.22 23.46 132.05 15%
June 289.12 147.31 26.11 115.70 18%
July 255.93 152.22 25.76 77.95 25%
August 262.15 152.22 28.64 81.29 26%
September 261.92 147.31 28.16 86.45 25%
October 317.79 152.22 22.25 143.32 13%
November 301.44 147.31 9.78 144.36 6%
December 263.23 152.22 5.04 106.03 5%
Total 3,524.09 1,792.23 207.39 1,524.47 11%
* Current demand includes water loss; this figure does not represent billed/metered water.
** 2015 Demand / (Total Wastewater Generated - Environmental Discharges)
Note: “Surplus Recycled Water” is an estimate of recycled water available for future use over the course of a
month this does not account for storage constraints or treatment plant limitations.
SOURCE: City of San Luis Obispo Utilities Department, 2017.
Irrigation Demand at Buildout
Table 4 projects the total monthly recycled demand and surplus recycled water at General Plan
buildout with high and medium priority projects completed. Although the buildout timeline is
uncertain, if wastewater flow does not increase above 2015 levels, the City will have a sufficient
supply to provide recycled water to irrigation customers through the year. In July, August, and
September the City may experience peak day shortages in recycled water availability. Under this
scenario the City may supplement recycled water supplies temporarily or consider scheduled
recycled water deliveries. Future storage constraints limiting the delivery of the available supply
are described in Chapter 6. High and medium priority project details are provided in Chapter 5.
While the City plans to use recycled water to its highest and most beneficial use, expanding the
recycled water system for landscape irrigation will offset the demand for potable water both
during drought and non-drought periods. Table 4 also shows that should the City choose to
continue expansion of the recycled water distribution system; it will continue to have seasonal
surplus water for available for alternative uses such as potable reuse or delivery outside of City
limits. However, there may be limitations on availability of surplus water during peak demand
periods such as July, August, and September.
City of San Luis Obispo
2017 Recycled Water Master Plan
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Table 4: Future (Buildout) Monthly Recycled Water Demand
With High and Medium Projects
Month
Recycled Water Demand Surplus
Recycled
Water
2015
Demand
Pending
Projects
High
Priority
Projects
Medium
Priority
Projects
New
Development
January 5.64 0.74 1.72 2.42 11.01 149.74
February 5.05 0.66 1.54 2.17 9.85 170.87
March 10.61 1.39 3.23 4.55 20.69 113.21
April 16.89 2.21 5.15 7.25 32.95 95.98
May 23.46 3.07 7.15 10.06 45.76 66.01
June 26.11 3.42 7.95 11.20 50.94 42.18
July 25.76 3.37 7.85 11.05 50.26 5.42
August 28.64 3.75 8.73 12.29 55.88 0.65
September 28.16 3.69 8.58 12.08 54.93 7.17
October 22.25 2.92 6.78 9.55 43.41 80.67
November 9.78 1.28 2.98 4.19 19.07 116.83
December 5.04 0.66 1.54 2.16 9.84 91.83
Total 207.39 27.17 63.18 88.97 404.59
NOTE: Assumes use of recycled water for landscape irrigation; demand for approved projects is as of June 2016.
SOURCE: City of San Luis Obispo Utilities Department, 2017.
Alternative Uses of Recycled Water
With the assistance of Water Systems Consulting (WSC), the City was awarded state grant funding
to develop a Recycled Water Facilities Planning Study (RWFPS). The study examined several
options in addition to in-City landscape irrigation for maximizing the long-term beneficial use of
recycled water within the City’s sphere of influence. These are:
1: Deliver tertiary-treated recycled water to agricultural interests outside of the City;
2: Deliver tertiary-treated recycled water to California Polytechnic State University,
San Luis Obispo (Cal Poly);
3: Provide groundwater recharge (GWR) within the San Luis Obispo Valley Basin for
indirect potable reuse (IPR);
4: Provide direct potable reuse (DPR); and
5: Construct a new satellite water resource recovery facility to serve Cal Poly and the
surrounding areas.
Using a “triple bottom line” approach to examine the social, economic, and environmental
benefit of the five options, the City and other stakeholders narrowed the list of the top three.
The top three options were:
1: Deliver tertiary-treated recycled water to agricultural interests outside of the City;
City of San Luis Obispo
2017 Recycled Water Master Plan
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3: Provide groundwater recharge (GWR) within the San Luis Obispo Valley Basin for
indirect potable reuse (IPR);
4: Provide direct potable reuse (DPR);
For more information on the methodology and criteria used to identify these options, along with
associated cost estimates for each option, please see Appendix A.
Recycled Water Use Outside of the City
As discussed in the RWFPS, the City’s current recycled water demand is less than its production
capability. The City refers to this unallocated recycled water supply as “surplus.” Short- and long-
term outside City delivery scenarios may provide short-term beneficial use of the City’s recycled
water supply through the entire year and long-term beneficial use during off-peak demand.
Details on future WRRF infrastructure upgrades, outside City delivery scenarios, and a timeline
for implementation are provided in Appendix A.
Short-Term Use of Surplus Water
Based on 2015 recycled water demand
data, the City has approximately 75 acre-
feet of surplus recycled water available per
month during the peak demand period
(July, August, and September). During the
remainder of the year (off-peak period)
the City has over 100 acre-feet per month
of surplus recycled water. As demand
increases within the City, the volume of
surplus recycled water would reduce;
however, monthly deliveries of surplus
recycled water could continue for several
years before significant impacts to
available surplus are seen from irrigation
system expansion or potable reuse.
A potable reuse program cannot be
implemented until after completion of the
WRRF Project, in the short-term, as the
timeline for IPR is estimated at greater
than five years and the timeline for DPR is
unknown in 2017.
Table 5: Estimated Short-term Recycled Water
Surplus by Month
Month Available Recycled Water
Surplus (AF)*
January 165.63
February 185.08
March 143.07
April 143.53
May 132.05
June 115.70
July 77.95
August 81.29
September 86.45
October 143.32
November 144.36
December 106.03
Total 1,524.47
*Recycled water quantities identified above are preliminary
estimates based on 2015 WRRF influent and 2015 recycled
water demand. The City’s production capability may vary.
SOURCE: City of San Luis Obispo Utilities Department, 2017.
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2017 Recycled Water Master Plan
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Long-Term Use of Surplus Water
Based on the estimated surplus water available at
buildout, the City has minimal surplus recycled water
available per month during the peak demand period
(July, August, and September) for outside City delivery.
During the remainder of the year (off-peak period) the
City has a significant supply of surplus recycled water.
With the upgrade of the WRRF, the City will explore
potable reuse in the future. Until the City conducts
additional research on the groundwater basin, the
quantity of recycled water that could be used for indirect
potable reuse is unknown. Just as deliveries to outside
City interests could be reduced as recycled water is
needed for future development and irrigation system
expansion, the same could occur when water is needed
for potable reuse.
Indirect Potable Reuse (IPR)
As described in the RWFPS, an alternative use of
recycled water is IPR through groundwater recharge.
Using recycled water as a means for recharging the basin
allows the City to increase groundwater availability by
injecting or percolating recycled water into the aquifer
during months when the basin is not naturally
recharging through rainfall. IPR can be completed
through percolation or direct injection which are each
discussed in further detail below.
Groundwater Recharge via Percolation
Groundwater recharge via percolation can be completed in two ways: streambed percolation or
dedicated infiltration basins. Groundwater recharge via streambed percolation was examined in
the RWFPS. According to the RWFPS, streambed percolation could only occur during periods
when San Luis Obispo Creek is dry which would limit the overall yield due to the limited quantity
of recycled water available during the summer months. The RWFPS concluded that the basin may
recharge up to 840 acre-feet during dry weather periods. T his number could be affected by a
variety of factors including yearly variance in rainfall and weather, the rate at which the basin
could percolate the recycled water, future supply constraints related to changing indoor water
use, or future demand increases related to in-City irrigation use and outside City deliveries.
The potential recharge amount identified in the RWFPS was not based on hydrogeological data
and would require additional studies to determine the actual yield that the City could realize.
Advantages and disadvantages of streambed percolation, along with cost estimates and
regulatory considerations are provided in Appendix A.
Table 6: Estimated Monthly
Long-term Recycled Water
Surplus
Month
Long-term
Recycled Water
Surplus (AF)*
January 149.74
February 170.87
March 113.21
April 95.98
May 66.01
June 42.18
July 5.42
August 0.65
September 7.17
October 80.67
November 116.83
December 91.83
*The long-term recycled water surplus
identified here represents an estimate of
the available recycled water supply each
month once buildout has been reached
and all high- and low-priority projects have
been implemented.
SOURCE: City of San Luis Obispo Utilities
Department, 2017.
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2017 Recycled Water Master Plan
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Groundwater recharge via percolation can also be achieved through dedicated infiltration basins.
The RWFPS did not examine the ability to recharge through dedicated infiltration basins and
additional studies would be required to determine the feasibility, cost, and the yield that could
be achieved through the use of dedicated infiltration basins. Dedicated infiltration basins are
commonly used to reduce stormwater
pollution by diverting stormwater into
dedicated basins where the water is
filtered naturally into the groundwater
basin. As with streambed percolation,
the City could experience difficulties
recharging the basin during wet
weather months.
Groundwater Recharge via Injection
Although not studied in the RWFPS,
groundwater recharge can also be
achieved using injection wells.
Additional treatment may be required
using this technique as the earth’s natural treatment abilities that are provided through
percolation would be bypassed. The injection/recharge rate, costs, and a variety of other matters
would require further study.
Direct Potable Reuse
Direct Potable Reuse (DPR) is the introduction of advanced purified water directly into a public
water system, or into a raw water supply immediately upstream of a water treatment plant .
Based on the information available in 2016, WSC provided a high level overview of the feasibility
of use of direct potable reuse in the RWFPS. Unlike IPR, direct potable reuse would not
experience seasonal limitations and could be used during times of low demand and high supply
when irrigation use and groundwater recharge are not feasible. While the City may have existing
obligations to irrigation customers, potable reuse could supply the remainder of the water to the
community as a drinking water source.
While DPR is not approved in California as of 2017, regulations are being developed and should
provide the City with the information necessary to further examine the cost effectiveness and
feasibility. While DPR may provide the highest and best use of recycled water by providing it as a
potable source, costs, regulatory requirements, and public acceptance are still yet to be fully
vetted and identified. Pending regulatory approval, an implementation timeline for DPR is
unknown but has been estimated to take close to ten years. This leaves the City with adequate
time to further consider the potential use of DPR. Additional information on cost estimates,
regulatory concerns and advantages and disadvantages of DPR are provided in Appendix A.
City of San Luis Obispo
2017 Recycled Water Master Plan
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Laguna Lake
Another potential customer for recycled water within the City is Laguna Lake. Laguna Lake Park is
a 375-acre City park, with the main entrance located at the corner of Madonna Road and Dalidio
Drive. The park includes group barbecue and picnic areas, fitness and recreational facilities, hiking
trails, and provides habitat for waterfowl and other wildlife . Recycled water is used for
landscape irrigation within the park.
The Laguna Lake Management Program (1982), as well as the updated Laguna Lake Natural
Reserve Conservation Plan in 2014, recognized use of recycled water as one option to enhance
Lake levels. It is estimated that up to 450 AFY of water could be utilized to augment the lake level.
This demand would vary from year to year with the amount of runoff from the corresponding
drainage basins. Additional analysis related to Laguna Lake is provided in Appendix B.
Dual Plumbing
The use of disinfected tertiary recycled water for toilet and urinal flushing in nonresidential
buildings is allowed in Section 60307(a) of Title 22 of the California Code of Regulations (Title 22).
Recycled water has been used for toilet and urinal flushing in buildings in California since 1991.
The Irvine Ranch Water District (IRWD) in Orange County has over 40 dual plumbed commercial
buildings using recycled water within its service area. Marin Municipal Water District, the City of
San Diego, and several other agencies have also constructed dual plumbed buildings within their
service areas.
One concern with dual plumbing is the potential for the cross connection of potable and non-
potable water supplies. A cross connection occurs when a potable water supply and a non-
potable supply are connected, creating an environment where non-potable water may be
unknowingly consumed. Proper design and diligent agency oversight of dual plumbed facilities
is necessary to prevent any cross-connections and minimize risk to public health.
Recycled water has not been used for dual plumbing in the City, however, the City may consider
taking the necessary steps in the future to be permitted to deliver recycled water for dual
plumbed systems. The City would need to obtain the required permits and approvals prior to
allowing customers to use recycled water for dual plumbed systems including:
Regulatory permitting from the RWQCB, and
Responsibilities of the City’s Chief Building Official to ensure compliance with specific
Plumbing Code requirements, and
Modifications to the City’s Procedures for Recycled Water Use ensuring that the City’s
rules and regulations properly address dual plumbed uses.
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Chapter 5. Future Recycled Water Use for Landscape Irrigation
In order to understand future recycled water demand for landscape irrigation, this chapter
discusses demand from pending projects, use of recycled water in specific plan areas, and high,
medium and low priority retrofit opportunities and projects.
Pending Projects/Approved Accounts
The City and the Regional Water Quality Control Board have approved the use of recycled water
at eleven locations. These projects are at various stages of construction or are existing properties
that have submitted plans to retrofit irrigation systems to use recycled water.
Table 7: Estimated Recycled Water Demand from Pending Projects
Account/Property Address
Projected
Recycled Water
Demand
(Acre-Feet)
Community Garden 11175 Los Osos Valley Road 0.5
Irish Hills Hamlet 11321-11359 Los Osos Valley Road 7
Calle Joaquin Park and Ride Calle Joaquin 1
Long Bonetti Ranch Public Market 3987 South Higuera / Tank Farm 5
Toscano Homes (4 meters) 3000 Calle Malva (meter locations
on San Vicente and Arrezo)
10
Ironworks 3682-3684 Broad Street 5
Coast BMW 1251 Calle Joaquin 2.5
Homeless Services Center 40 Prado Road 2.5
Town Place Suites 1301 Calle Joaquin 2.5
Perry Ford 12200 Los Osos Valley Road 1
36-unit Affordable Housing Project 3175 Violet Street 2.5
Total: 39.5*
Note: Projected recycled water demand is an estimate based on projected use, irrigated area, and previous use
by similar properties.
*Additional properties have been approved for recycled water use since the projection of 27.17 AF/year was made
in Table 4.
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2017 Recycled Water Master Plan
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Use of Recycled Water in Specific Plan
Areas
The route of the City’s initial eight miles of recycled
water pipe from the Water Reuse Project was
selected to serve the developing portions of the City
including the Margarita Area, the Orcutt Area, and
the Airport Area (including Avila Ranch). The San
Luis Ranch and Froom Ranch specific plan areas are
also located proximate to the City’s existing recycled
water distribution system. New development in
these areas will be designed to use recycled water
for irrigation rather than potable water. Although
development in these areas may not occur for many
years, the backbone distribution system has been
planned to deliver recycled water to future
development areas as the need develops.
High-Priority Retrofit Projects
As shown in Table 1, many existing recycled water
customers were brought online by retrofitting
existing irrigation systems for recycled water use. The City has provided funding for irrigation
system retrofits in the past, however, due to completing priorities in the Water Fund, this funding
was eliminated. The City requires existing potable water customers to retrofit their irrigation
system to utilize recycled water when seeking a discretionary approval. The City has continued
to see property owners seeking to retrofit their properties to use recycled water without
reimbursement by the City. Customers may retrofit their properties for a variety of reasons
including:
Recycled water is not subject to most water conservation and drought regulations.
Reduced rates for recycled water may provide a cost-benefit to transitioning from
potable to recycled water for irrigation use.
Social and environmental stewardship involved with reducing the demand for
potable water.
The identified high-priority projects would be considered with other projects for funding during
the City’s Financial Plan process. The City’s 2017-19 Capital Improvement Plan proposes funding
for a study related to additional recycled water storage.
Retrofitted properties must follow the same procedures for recycled water use as newly
constructed properties. Expansion of the recycled water system through retrofits remains a
priority to the City as a method for expanding the beneficial use of recycled water. Appendix D
describes 12 potential recycled water service/irrigation system retrofits. These projects are
identified as “high priority” (or “high feasibility”) as they meet the following criteria:
TABLE 8: Recycled Water Demand
Estimate for Specific Plan Areas
Specific Plan
Area
Projected Recycled
Water Demand
(Acre-Feet)
Margarita Area 35
Orcutt Area 98
Airport Area* 139
San Luis Ranch 73
Froom Ranch 60
TOTAL: 405
Note: Projected recycled water demand is an
estimate based on projected use, irrigated
area, and previous use by similar properties.
* Recycled water demand for the Avila Ranch
project and the Chevron, Fiero Lane, and East
Airport annexations areas are included in the
Airport Area Specific Plan total.
City of San Luis Obispo
2017 Recycled Water Master Plan
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All locations have existing irrigation meters or could easily have a new meter installed.
No new recycled water mains extensions or installations are required.
Service locations are proximate to existing mains or could feasibly be relocated.
Minor irrigation system modifications and signage installations would be necessary .
The identified projects are highly desirable due to the amount of potable water offset that could
be achieved, varying from approximately one-acre foot per year to over eight acre feet per year.
The total potable water offset from the completion of these projects is over 63 acre-feet per year.
A summary table and cost estimates is provided in Table 9 and project locations are shown on
Figure 5. The average per acre foot cost for these high-priority retrofit projects is $3,764 per acre
foot. Detailed maps and descriptions of projects can be found in Appendix D.
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Table 9: High-Priority Irrigation System Retrofit Projects
Project # Address Customer/Common Name AF/Y Total AF/Y Cost/AF*
1.1
1490 Descanso Laguna Linda Homeowners 0.92
2.50 $12,480 1492 Prefumo Canyon Prefumo Canyon Estates 0.50
1496 Prefumo Canyon Prefumo Canyon Estates 0.28
1445 Prefumo Canyon Laguna Green Home Assoc 0.80
1.2 1106 Oceanaire Windermere Homeowners 1.15 2.53 $6,166 11295 Los Osos Valley Cedarwood Inc. / HOA 1.38
1.3 1704 Tonini (1) De Tolosa Ranch 1.84 3.67 $3,433 1704 Tonini (2) De Tolosa Ranch 1.84
1.4 1778 Tonini Rancho Obispo Properties 3.44 4.59 $3,399 2000 Devaul Ranch Rancho Obispo HOA 1.15
1.5 1433 Calle Joaquin Motel 6 1.15 1.15 $6,261
1.6 1585 Calle Joaquin Rose Garden Inn 2.30 4.59 $3,573 1625 Calle Joaquin Motel 6 2.30
1.7
210 Margarita SLO Non Profit Housing 0.69
8.95 $2,011
200 Via San Blas Margarita Villa Association 2.75
210 Via San Blas Margarita Villa Association 2.07
280 Via La Paz Margarita Villa Association 2.07
285 Via La Paz Margarita Villa Association 1.38
1.8
711 Tank Farm Tank Farm Properties 1.38
3.44 $5,930 715 Tank Farm Tank Farm Properties 0.46
735 Tank Farm Edna Valley Office BLDG 1.61
1.9
899 Columbine REG/Santa Lucia Hills 3.10
8.41 $3,424 945 Tank Farm L-B City of San Luis Obispo 1.15
946 Tank Farm L-A Willowbrook II HOA 2.98
944 Felicia Willowbrook II HOA 1.18
1.10
1096 Sunrose REG/Willowcreek HOA 2.07
8.38 $3,437 1024 Tank Farm SLO Parks 0.11
949 Bluebell Summerhills HOA 4.13
1055 Bluebell Summerhills HOA 2.07
1.11
1102 Ironbark Islay Hills Associates 1.19
6.47 $3,617 1223 Manzanita Islay Pointe HOA 1.72
1280 Chaparral Islay Pointe HOA 3.56
1.12
3590 Broad Broad St Owners Assoc 1.73
8.49 $2,332 3588 Broad Broad St Community Assoc 5.05
3586 Broad Sacramento Owners Assn 1.71
Total High Priority Retrofit AF: 63.18 $3,764
NOTE: Cost information is summarized in Table 12 and detailed in Appendix D. The Project #s included in the table
are for identification purposed only and are not intended to suggest project prioritization.
SOURCE: City of San Luis Obispo, Utilities Department, 2017.
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Medium-Priority Irrigation System Retrofit Projects
This section describes nine potential retrofit projects to expand recycled water use for landscape
irrigation. These projects are identified as “medium priority,” or “medium feasibility,” as they
meet the following criteria:
All locations have existing irrigation meters or could have an irrigation meter installed
New recycled water main extensions are required
Service locations are proximate to existing recycled water mains or the service location
could be relocated
Irrigation system modifications and signage installations would be necessary.
The identified projects are desirable due to the amount of potable water offset that could be
achieved, varying from approximately 2.66 acre-feet per year to over 36 acre-feet per year. The
total offset from existing potable water usage for these projects is estimated at 89 acre-feet per
year. A summary table and cost estimates can be viewed in Table 11, all locations are shown on
Figure 4. Detailed maps and descriptions of these medium-priority projects are provided in
Appendix E.
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Table 10: Medium Priority Irrigation System Retrofit Projects
Project
# Address Customer/Common Name AF/Y Total
AF/Y Cost/AF*
2.1 11491 Los Osos Valley Pathpoint/Old SESLOC 0.55 2.85 $5,474 1351 Royal The Pines HOA 2.30
2.2 1375 Balboa CL Smith Elementary
School 10.32 10.34 $25,706
2.3
90 Encanto Los Verdes II 1.15
6.26 $29,808 20 Perla Los Verdes II 1.61
50 El Mirador Los Verdes II 1.55
51 El Mirador Los Verdes II 1.95
2.4* 4021 Broad Ottano Shell Station 1.26 2.66 $115,940 651 Tank Farm Mindbody 1.4
2.5* 892 Aerovista Aerovista LLC 1.03 5.62 $166,612 895 Aerovista Aeroloop LLC 4.59
2.6
1211 Ironbark Islay Hill Owners 2.47
8.62 $57,285 1341 Purple Sage L-B Rodriguez Adobe Park 3.49
4600 Spanish Oaks Islay Hill Owners 2.66
2.7*
3510 Broad IOMG Inheritence LLC 0.40
5.73 $24,817 3550 Broad Broad & Capitolio LLC 2.00
775 Capitolio Level 3 Communications 3.33
2.8*
803 Basil Avivo HOA 3.44
10.79 $41,928 805 Bay Leaf Tumbling Waters INC 2.75
3280 Sacramento Four Creeks 4.59
2.9*
1102 Laurel Andre Morris & Buttery 0.95
36.12 $17,488
1150 Laurel ESCORP 3.44
904 Southwood (Field) Sinsheimer Baseball Fields 8.03
2550 Blvd Del Campo Sinsheimer Park Bike Path 0.73
904 Southwood (Park) Sinsheimer Park 6.89
2800 Augusta Johnson Park 4.82
1045 Southwood Parkwood Village HOA 4.59
1198 Bedford Laurelwood HOA 1.38
2755 Augusta Sinsheimer Elementary 5.28
Total Medium Priority Retrofit AF: 88.98
NOTE: Cost information is summarized in Table 12 and detailed in Appendix E. The Project #s included in the table
are for identification purposed only and are not intended to suggest project prioritization.
* Portions of identified projects may be constructed with orderly development and may require prior completion of
other projects to be feasible.
SOURCE: City of San Luis Obispo, Utilities Department, 2017.
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Low Priority Irrigation System Retrofit Projects
Through the examination of potential recycled water customers within the city limits, staff
identified 50 existing accounts that were deemed “low-priority” or “low-feasibility” for
connecting to the recycled water system. Many of these properties encountered one or a
combination of the following factors which influenced their placement as low priority/feasibility
projects.
Low projected recycled water demand
Lack of existing irrigation meter separate from domestic meter
Requirement of significant capital to finance extensive main line installations
Needed additional research/information to inform placement
While these properties are currently low-priority/feasibility, the continued extension of recycled
water lines may increase feasibility of certain projects over time. Staff will reevaluate the
feasibility and likelihood of connecting future accounts as the recycled water system is expanded.
Table 11: Low-Priority Irrigation System Retrofit Projects
Project
# Address Customer/Common Name AF/Y Total
AF/Y
3.1 1451 Diablo - A Clearview HOA 1.15 2.30 1451 Diablo - B Clearview HOA 1.15
3.2 1750 Prefumo Canyon La Canada Village 4.59 5.02 1098 Isabella Prefumo Creek HOA 0.42
3.3 1274 Laguna Laguna Shores 0.69
3.16
1330 Vista Lago Laguna Shores 0.57
1269 Vista Lago City of San Luis Obispo 0.57
1267 Vista Lago Laguna Shores 0.17
1220 Vista Lago Laguna Shores 1.15
3.4 1551 Froom Ranch Home Depot 0.80 0.80
3.5 4280 Higuera S Housing Authority 0.92 0.92
3.6 3765 Higuera S Hind Properties 0.00
0.05 3650 Higuera S Eagles 0.05
3.7 3595 Higuera S Wayne's tires 0.01
0.76
3566 Higuera S Coastal Peaks Coffee 0.23
3536 Higuera S Fiduciary Properties 0.11
3583 Higuera S Gary Heon 0.02
3577 Higuera S Big Brand Tire 0.04
3547 Higuera S Tract 1399 Homeowners 0.34
3.8 145 Prado Easy Ad 0.11
0.11 3433 Higuera S County of San Luis Obispo 0.00
183 Prado Wightons 0.00
3.9 2885 Higuera S Cal Trans 1.55 1.55
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Project
# Address Customer/Common Name AF/Y Total
AF/Y
3.10 1800 El Mercado Madonna Plaza SRT LP 4.82 5.97 201 Madonna Madonna Plaza SRT LP 1.15
3.11 2275 King Meadow Park 11.94
25.02 2331 Meadow Meadow Park 12.63
2333 Meadow Meadow Park Garden 0.46
3.12 4111 Broad Alan Mcvay 0.06
0.20 4115 Broad Alan Mcvay 0.14
4119 Broad Alan Mcvay 0.00
3.13 4420 Broad Pepper tree business park 0.26
1.64 943 Ambrosia Willows at Islay Hill 0.46
986 Fuller HOA of Stonecreek DEV 0.92
3.14 4005 Poinsettia Willowbrook I HOA 0.57 1.49 4035 Poinsettia Edna-Islay Housing Corp 0.92
3.15 1170 Poppy Santa Lucia Hills HOA 0.69
3.27 1074 Yarrow Santa Lucia Hills HOA 2.30
4662 Poinsettina -A City of San Luis Obispo 0.29
3.16 3362 Rockview Quaglino Properties 1.03
2.76 3340 Rockview Ridgepoint H/O Assoc 1.15
3240 Broad Dan Lemburg (Subway Complex) 0.24
3230 Broad Dan Lemburg (Thai Boat Complex) 0.34
3.17 3212 Broad Village Marketplace (Lemos) 0.63
6.23
3180 Broad Chevron Sta - Site 81341 0.23
3165 Broad Michael Hook 0.09
3050 Broad Chevron USA INC 1.10
781 Mutsuhito Rosa Homeowners Assn 4.18
3.18 3003 Rockview Jack Foster 0.14 0.98 2975 Rockview Rockview Heights 0.84
Total Low Priority 62.22
NOTE: The Project #s included in the table are for identification purposed only and are not intended to suggest
project prioritization.
SOURCE: City of San Luis Obispo, Utilities Department, 2017.
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Chapter 6. Recycled Water Storage
Future recycled water demand for landscape irrigation is approximately 800 acre-feet per year.
This chapter discusses storage necessary to meet anticipated daily recycled water deliveries and
summarizes the Recycled Water Storage Analysis prepared by Wallace Group. The complete
memorandum is provided in Appendix C. Incremental expansion of the City’s recycled water
storage will be necessary to supply this level of recycled water demand.
To minimize operation and maintenance costs, the City’s recycled water distribution system is
designed with one pressure zone. As part of the City’s Water Reuse Project completed in 2006, a
600,000-gallon underground storage tank was constructed at the WRRF to provide storage for
the recycled water distribution system. The usable storage volume is approximately 500,000
gallons. The 2004 Master Plan concluded that this existing storage volume could supply
approximately 320 acre feet per year.
As part of the storage evaluation, Wallace Group reviewed the 2004 RWMP to confirm
assumptions and hydraulic parameters compared to current data. It is evident that several 2004
assumptions have changed over the past 12 years; findings include:
Actual irrigation demands are 30 to 35 percent less than projected in 2004.
Overall demand, including average-day demand and peak-day demand, are somewhat
lower than anticipated in 2004.
Peak hour demand for recycled water is at or near the 2004 RWMP projections.
Historically, the City generally operated the distribution system at 133 psi at the pumping station,
which corresponds to a hydraulic grade line of 432 feet above mean sea level. More recently, the
operating pressure set point was reduced to 125 psi (410 feet) to help control hydraulics and
pressure fluctuations in the delivery system.
The Storage Analysis recognizes key factors related to WRRF operations and the upcoming WRRF
project. As part of their work on the RWFPS, WSC prepared a recycled water production analysis
which concluded that currently the WRRF was limited in recycled water production by availability
of secondary effluent, estimated to be 1.5 mgd to 1.9 mgd. However, the reliability of delivering
such effluent during summer demand was seen to diminish below 90 percent when demands
ranged from 1.0 mgd to 1.4 mgd. When the WRRF improvements are completed in Year 2021, all
effluent, minus the 1.6 mgd creek discharge required by NOAA NMFS, will be available for
recycled water production. This flow will not be available at a constant flow rate. The WRRF
project was designed to treat 5.4 mgd to serve General Plan buildout.
As part of the storage evaluation, Wallace Group evaluated recent supply and demand
information. This includes the City's population and flow data planned as part of the City's WRRF
Project, slated for completion in Year 2021. The storage analysis is based on the following:
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• Recycled water demand will occur within an irrigation window between 11 pm and 6 am.
Incidental demands for construction water will occur during the day.
• Future daily recycled water demand uses the same trend curve as existing daily recycled
water demand through the daily irrigation period.
• WRRF Production rates will be assumed to follow a typical municipal diurnal curve.
The analysis evaluated both storage volume and demand to identify when the City would need
additional recycled water storage. Four scenarios were analyzed to simulate maximum daily
demand through the irrigation period for 2016, 2018, 2019 and 2036. The chart below illustrates
estimated recycled water production at the WRRF, recycled water supplied for irrigation, and
recycled water storage volume for a 24-hour period in the year 2018.
Recycled Water Storage Analysis Memorandum,
Figure 8, 2018 Production, Outflow and Cumulative Storage Volume.
The Wallace Group recommends additional storage be constructed when annual recycled water
demand reaches 300 acre-feet, and notes that by providing additional 1.36 million gallons of
storage for a total of 1.96 million gallons of storage, the City can meet summer peak day demands
under buildout conditions.
Additional storage will be included in the Capital Improvement Plan provided in Chapter 7. The City’s
desire is that future storage continue to be integrated into the existing recycled water
distribution system to minimize necessary maintenance.
The Wallace Group analyzed the following sites for additional recycled water storage including
repurposing existing facilities within the WRRF (approximately 1.36 million gallons), repurposing the
existing potable water Islay Tank (a 400,000 gallon tank south of Tank Farm Road), construction of
a “sister” tank next to the existing recycled water storage tank, locating an elevated storage tank
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adjacent to the Froom Ranch project, and locating an elevated storage tank off of Higuera Street
east of the cemetery. A study phase of a recycled water storage project is proposed as part of the
2017-19 Capital Improvement Plan to provide further analysis of storage tank options. A review
of the existing pump station may be conducted while considering the future recycl ed water
storage options.
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Chapter 7. Capital Improvement Plan
Past Capital Investment
When recycled water deliveries began in 2006, it was the City’s first new water supply since
deliveries from Whale Rock Reservoir began in the 1960s.
In the City’s 2003-05, 2005-07, 2007-09 and 2009-11 Financial Plans, annual funding of
$250,000/year was identified from the Water Fund Capital Improvement Plan (CIP) for expansion
of the recycled water distribution system and to reimburse customers who retrofitted irrigation
systems to use recycled water. This funding was utilized for the retrofit of five City parks irrigation
systems, user site improvements at Laguna Middle School, Los Verdes I and De Tolosa Homes,
and the extension of the recycled water distributio n system on Broad Street, South Higuera Street
and Margarita Street. In the 2011-13 Financial Plan, with limited available revenue, the Water
Fund CIP focused on debt repayment and replacement of aged potable water infrastructure and
facilities. This was the City’s continued focus in the 2013-15 Financial Plan. In the past, the
Utilities Department has applied for grant funding through the Integrated Regional Water
Management (IRWM) funds and will pursue additional grant opportunities in the future as
available.
Future Capital Investment
This chapter presents a capital improvement plan for future expansion of the City’s recycled
water distribution system. The capital plan summarizes improvements, cost estimates, and
establishes phasing of projects through the 2035 planning horizon. The purpose of this capital
plan is to provide the City with a guideline for the planning and budgeting of future improvements
to the recycled water distribution system. This capital plan is based on the evaluation of the
projects described in Chapter 6 and Appendices C and D. These include:
Recycled water storage
Recycled water distribution system and retrofit projects
All project costs are in 2016 dollars. Treatment improvements required for maximum recycled
water production are identified in the City’s Water Resource Recovery Facility Facilities Plan from
June of 2015.
Capital investment is required to expand the City’s recycled water distribution system to establish
a reliable recycled water supply for existing and new recycled water customers through year
2035. Figures 5 and 6 show distribution system expansions, with corresponding identification
number (IDs) shown in Table 9 and 10. As presented in Table 12, the improvements total
approximately $5.25 million dollars.
The City is planning to expand its recycled water distribution system , where appropriate, to
continue offsetting potable water demands and improve the City’s overall water supply
resiliency. To define and prioritize the capital improvement projects needed to achieve this goal,
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the City worked with the Wallace Group on modelling the future recycled water distribution
system and to identify potential locations for future recycled water storage tanks. Planning level
project costs were developed and include estimated costs of engineering design, construction,
construction management and inspection, and contingencies.
Recycled Water Distribution System Projects
Construction costs for extending the recycled water distribution system include pipe material,
excavation, installation, bedding material, backfill material, transport, and paving where
applicable. Valves and appurtenances are included in the cost estimate. The costs of acquiring
easements for pipeline construction are not included in this estimate, although most distribution
pipeline routings are within existing City street right-of-way. Cost estimates for pipeline
construction were based on unit costs from the Wallace Group for the water pipelines within the
City. Pipeline capital costs for 8-inch and smaller pipelines was estimated to be $200 per linear
foot (LF), 10-inch to 18-inch pipelines to be $300/LF.
Irrigation System Retrofit Project Cost Estimates
New service connections are required for serving recycled water from the distribution pipelines
to customer properties. Items included in the connection cost are: abandonment of existing
potable services, tapping the recycled water distribution mains and installing service laterals,
meters, pressure reducing valves (PRVs), and a backflow prevention device on the property’s
potable water system. It is assumed that the average size for laterals, meters, and PRVs will be
two-inch. Service connection costs are estimated to be $4,000 each.
Irrigation system retrofit costs are associated with separating the customer’s existing water
system from a new recycled water system. An example would be a park where restroom and
drinking fountain water supply pipes would need to be isolated from an existing irrigation system.
Additional costs include posting signs that identify recycled water is being used. Customer
retrofits are one-time costs and are a function of existing irrigation systems at each individual
site. Retrofits for most customers were estimated to range from $1,500 to $2,500 based on the
extent of necessary irrigation modifications. If the site has existing separate landscape irrigation
service, then the retrofit cost is assumed to be on the low-end of that range.
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Table 12: Recycled Water Capital Plan
Project
# Project Estimated
Cost Phasing
Recycled Water Storage Project
S-1 Recycled Water Storage – Study Phase $50,000 2017-19
S-2 Recycled Water Storage – Design Phase $250,000 2019-21
S-3 Recycled Water Storage – Construction Phase $1,250,000 2021-23
Recycled Water Storage Project Total $1,550,000
High Priority Irrigation System Retrofit Projects
1.1 Los Osos Valley Road / Descanso $31,200
2017-25
1.2 Los Osos Valley Road / Oceanaire $15,600
1.3 Los Osos Valley Road / Madonna $12,600
1.4 Los Osos Valley Road / DeVaul Ranch $15,600
1.5 Calle Joaquin (1400 Block) $ 7,200
1.6 Calle Joaquin (1500-1600 Block) $16,400
1.7 Margarita (200 Block) $18,000
1.8 Tank Farm / Broad $20,400
1.9 Tank Farm / Columbine / Felecia $28,800
1.10 Tank Farm / Sunrose / Bluebell $28,800
1.11 Tank Farm / Chaparral $23,400
1.12 Broad (3500 Block) $19,800
High Priority Irrigation System Retrofit Projects Total $237,800
Medium Priority Irrigation System Retrofit Projects
2.1 Los Osos Valley Road / Royal $15,600
2025-35
2.2 Main Extension to CL Smith $265,800
2.3 Los Osos Valley Road / South Higuera $186,600
2.4* Tank Farm west of Broad Street $308,400
2.5* Broad Street south of Tank Farm Road $936,360
2.6 Brookpine/Purple Sage $493,800
2.7* Capitolio Extension $142,200
2.8* Capitolio/Sacramento $452,400
2.9* Sinsheimer Extension $667,500
Medium Priority Irrigation System Retrofit Projects Total $3,468,660
NOTE: * Portions of identified projects may be constructed with orderly development and may require prior
completion of other projects to be feasible.
SOURCE: City of San Luis Obispo, Utilities Department, 2017.
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Documents Referenced
City of San Luis Obispo
a. Municipal Code
http://www.codepublishing.com/CA/SanLuisObispo/#!/SanLuisObispo13/SanLuisObispo
1324.html
b. General Plan
Land Use Element, 2014.
http://www.slocity.org/home/showdocument?id=6635w
Water and Wastewater Management Element, 2016.
c. Climate Action Plan, August 2012
http://www.slocity.org/home/showdocument?id=4086
d. Urban Water Management Plan, 2015
http://www.slocity.org/home/showdocument?id=13618
e. Water Resource Recovery Facility Project, Final Environmental Impact Report
(SCH2015101044), July 2016.
http://www.slocity.org/Home/ShowDocument?id=10532
f. Water Reuse Master Plan, Dudek and Associates, 2004.
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Appendix A. Recycled Water Facilities Planning Study
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Appendix B. Recycled Water to Augment Lake Level at Laguna Lake
As part of the work to update the 2004 Master Plan, the City hired the Wallace Group to evaluate
the potential to augment Laguna Lake with recycled water. This section is a summary of that analysis.
Laguna Lake Park is a 375-acre City park, with the main entrance located at the corner of Madonna
Road and Dalidio. The park includes group barbecue and picnic areas, fitness and recreational
facilities, hiking trails, and provides habitat for waterfowl and other wildlife. Recreational activities
at the Lake include sail boating, row boating, power boating (under one horsepower}, and fishing
(from shoreline and boat). According to the 1982 Laguna Lake Management Plan, swimming is
allowable in the central and southeast portions of the Lake so long as CDPH water
quality/bacteriological standards are met. According to the City, swimming activity at the Lake is
infrequent.
The lake is approximately 110-acres in surface area, and has a full capacity volume of approximately
800 AF. The lake level is maintained by stormwater runoff only, which eventually discharges to
Prefumo Creek, tributary to San Luis Obispo Creek. The watershed to Prefumo Creek includes over
7,500 acres from the Prefumo Creek, Sycamore Canyon, Los Osos and O'Conner Valley watersheds.
The high elevation of the lake is 120 feet above mean sea level (MSL), and generally ranges from 115
to 116 feet MSL. It is estimated that the Lake loses an average of 450 AFY to evaporation,
corresponding to a lowering of the lake level by three to four feet annually. Based on CIMIS Weather
Station 52, San Luis Obispo, annual average evapotranspiration is approximately 52 inches, or 4.33
feet. Also, evaporation data from Bulletin No. 54, Department of Water Resources (DWR), also
shows local evaporation data for Salinas Reservoir (1942 to 1945 records) at 52 inches. Although this
data is outdated somewhat, it matches very closely to the modern CIMIS data on evapotranspiration.
These values of referenced evapotranspiration and evaporation data correlate well to the 1982
Laguna Lake Management Plan estimates of annual losses to evaporation in conjunction with
corresponding lowering of lake levels.
Lake depths range from 12 feet at the downstream terminus, six to eight feet in the central portion
of the lake, and zero to four feet in the various marsh areas and inlets to the north and west. The
1976 to 1978 drought nearly completely dried up the Lake; this incident help promote community
interest in the Lake and to help preserve its environmental, recreational and aesthetic value to the
City and nearby residents.
In the 1982 Laguna Lake Management Plan, five management alternatives were identified to
maintain and preserve the qualities of the Lake:
Maintain at least three to four feet of lake depth at seasonal low water level.
Reduce or eliminate existing aquatic weeds.
Provide for ongoing aquatic weed control.
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Prevent Prefumo Creek watershed sediment from reaching the lake.
Preserve the characteristics of the lake which are important to existing wildlife habitat,
flood protection, and recreational opportunity.
The City is again considering utilizing recycled water to augment the lake level. Based on the earlier
discussion on lake losses, the estimated quantity of recycled water that can be utilized year to year
is approximately 450 AFY. The 1982 Laguna Lake Management Plan recognized use of recycled water
as one option to enhance Lake levels to meet the above objectives, but technical/environmental
review of the recycled water constituents suggested recycled water use in the lake would not be
advisable (due to increased nutrient loading to the lake). It was decided at that time, that weed
abatement and focused excavation in areas of sediment deposition would be the most favorable
long-term plans to preserve the Lake's attributes.
According to Title 22 regulations, surface impoundment in non-restricted recreational
impoundments is allowable. Discussions with CDPH confirm that this is an acceptable use, and that
the City would be exempt from Section 60305(c) (supplemental monitoring) since the City treats
tertiary recycled water by conventional means (conventional sand filtration followed by disinfection,
as opposed to a direct filtration plant). As part of the approval process, the City will need to verify
that there are no public/domestic water wells within 100 feet of the impoundment.
The following considerations must be taken into account if recycled water is to be used to augment
the lake levels:
Signage will be required around the Lake, similar to "CAUTION RECYCLED WATER - DO NOT
DRINK".
Although swimming would be allowable so long as bacteriological standards for public
beaches are met, the City may wish to discourage or ban swimming as a recreational use.
With recycled water introduction into the Lake, CDPH requires signs to be posted that fish
caught in the Lake cannot be consumed.
Nutrient Loading Considerations
The 1982 Laguna Lake Management Plan, Technical Appendix B provides results of water quality
sampling from 1979 to 1980. The Lake also goes through an annual limnological cycle from winter to
spring, to fall and summer, with varying concentrations of dissolved oxygen, turbidity , pH and
nutrient concentrations year-round with the cycle of aquatic plant growth and die-off. The following
summarizes some of the key water quality considerations:
Dissolved oxygen (DO). DO concentrations appear to be maintained above 2 mg/L
year-round, ranging from around 6 to 10 mg/L in Spring/Summer. The higher
concentrations are above DO saturation in water, and would likely be due to algal
production of oxygen (photosynthesis). Significant wind action offers re-aeration of
water throughout the year, and keeps the water profile mixed.
pH. Summertime pH maintained around 8.0 to 8.2, slightly alkaline.
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Nitrate concentrations range from 10 to 20 mg/L during the Fall and Winter, and
from around 8 to 12 mg/L during Spring and Summer months. Total phosphorus
ranged from 0.3 to 0.7 mg/L year-round, but spiked as high as 1.3 mg/L during late
Fall to early Winter.
Temperature. The lake remains well mixed, and does not have thermal
stratification. Temperatures range from 50 degrees to 60 degrees Fahrenheit during
the winter months, and 55 to 75 degrees Fahrenheit during the warmer summer
season. Optimum temperatures for growth of algae generally range from 68 to 75
degrees Fahrenheit.
Nutrient loading of recycled water to the lake may be of concern from a water quality perspective,
with potential for increased algae generation. With the City's future plans to denitrify plant
effluent, this concern may lessen over time depending on how the lake responds to additional
phosphorus loading, and to what degree future treatment upgrades may reduce phosphorus in
plant effluent. The total phosphorus levels, especially at current concentrations, may still be of
concern relative to potential algal blooms. The USEPA recommends that phosphorus levels
remain below 100 ug/L (0.1mg/L) and nitrate levels below 10,000 ug/L {10 mg/L) to prevent
excessive growth of algae in water bodies. From the above, natural concentrations of nutrients
are typically in excess of these values for algae control. In wastewater, total phosphorus levels
are typically 4 to 12 mg/L, and have the potential to be well above recommended levels for algae
control. Sources of phosphorus addition include human waste, food and certain soaps and
detergents. The City's recycled water quality (based on 2012 analyses) indicates the total
phosphorus in the effluent is 4.5 mg/L (annual average) and total nitrogen is 0.17 mg/L (annual
average). The recycled water addition to the Lake would not likely impact nitrogen loading based
on historic levels naturally occurring in the lake; however, there would be a significant increase
in Total Phosphorus to the Lake.
This must be carefully considered as to the degree of impact on algal production from using
recycled water. During Spring/Summer months, Laguna Lake has the potential for significant algal
blooms with the shallow lake depths, pooled water, abundant sunlight, expected water
temperature ranges, and abundance of nutrient loading. It is also envisioned that if this
alternative were employed, the recycled water would enter the Lake at a single location with no
mixing other than by wind action. It is likely the recycled water would be dominant in the
southeast portion of the Lake, near the main Park entrance, and unsightly algal blooms could have
higher incidence in this area. If this option were employed, consideration of more than a single
source of introduction to the Lake might be prudent, possibly adding a point of dis charge in the
area of Laguna Middle School in addition to the Park Entrance area.
Midge (fly) Outbreaks
In the 1970s, there were several outbreaks of midge flies. These flies were of particular nuisance
to the surrounding community as they were small enough to enter homes through window
screens. According to the technical studies performed, and as summarized in Appendix B of the
Laguna Lake Management Plan Report, potential midge outbreaks increase with increased
City of San Luis Obispo
2017 Recycled Water Master Plan
B-4
production of phytoplankton. Thus, there is concern that any potential for increased nutrient
loading to the Lake could cause increased algal production and therefore midge populations as
well. The 1982 study recommended that recycled water NOT be used to augment the Lake levels,
unless phosphorus and nitrate levels could be reduced.
Although the City's WRRF treats to a much higher degree than in the 1970s, actual
recommendations for target nutrient concentration goals were not stated in this past report.
However, if the EPA target goals of 0.1mg/L total phosphorus and 10 mg/L nitrates serve as a
guideline in this regard, the addition of recycled water would significantly increase total
phosphorus levels above the minimum recommendations. This coupled with
background/existing nitrate levels in the Lake of 10 to 20 mg/L, could create a higher potential
for algae generation and thus midge outbreaks.
Recycled Water Supply
Recycled water augmentation to Laguna Lake is expected to be on average, 500 AFY. Since
surface water runoff peaks during the rainy season, Lake augmentation with recycled water
would be expected to begin around Summer each year, and diminish in the Fall (in anticipation
of beginning of rainy season and thus surface water runoff). Monitoring and management of
Lake levels will be prudent, to anticipate winter runoff peaks to minimize flooding impacts
downstream on Prefumo Creek.
Based on 110-acre surface area of the Lake, and using CIMIS Weather Station 52 data for historic
evapotranspiration, an estimation of evaporative losses to the Lake through the year is
presented in Figure F-1. Total annual evaporative losses were calculated at 477 AF per year
(historical average).
Figure F-1. Lake Evaporative Losses,
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
City of San Luis Obispo
2017 Recycled Water Master Plan
B-5
It is possible that delivery of recycled water to the Lake could be from multiple outlets. If the City
delivers water to Laguna Lake from two locations, such as near Laguna Middle School and near the
Park entrance off of Madonna Road, recycled water would be delivered through an eight-inch
diameter and 14-inch diameter pipe, respectively. Based on pipe diameter and capacity/velocity
considerations, a 14-inch diameter pipe can convey three times the amount of water in an eight-inch
diameter pipe. if it is assumed that recycled water deliveries are split between the two location s by
this ratio, the following table (Table B-1) summarizes the range of pipe velocities that would be seen
in the pipes given a range of delivery times and amount of delivered recycled water in a given month.
Based on this table, even an eight-hour delivery window would yield desirable pipe velocities. If all
water were delivered through the 14-inch pipeline on Madonna Road, the pipe velocity would still be
below five feet/second when delivering 100 AF/month (delivering eight hours per day, every day for
a month).
Table B-1. Summary of Pipeline Velocities at Potential Turnouts
Pipe
Diameter,
Inch
Total Delivery
to Lake,
AF/Month 1
Pipe Velocity, ft/s
8-hour
Day 10-hour Day 12-hour Day 16-hour Day 24-hour Day
14 50 1.8 1.4 1.2 0.9 0.6 8
14 75 2.7 2.1 1.8 1.3 0.9 8
14 100 3.6 2.9 2.4 1.8 1.2 8
1Assumes flow is split hydraulically between eight-inch turnout and 14-inch turnout.
Recommendations
The City of San Luis Obispo met on the Laguna Lake Management Plan in 2015, and indicated that
future plans will include the potential to supplement Laguna Lake with recycled water. This future plan
was generally accepted by the public. Based on the above findings, future considerations for use of
recycled water to augment Laguna Lake include:
Study to verify water quality parameters of the Lake such as nitrates, phosphates,
temperature, pH and dissolved oxygen, in conjunction with evaluating recycled water
quality parameters, particularly phosphorus removal based on future WRRF process
upgrades. Such results should then be used to assess potential for algae blooms in the
Lake.
Further study and consideration of mixing and dispersion of Lake water may be
warranted, in conjunction with alternative points of discharge of recycled water to
assess dispersion/dilution of nutrients in the Lake.
City of San Luis Obispo
2017 Recycled Water Master Plan
B-2
Continue to update the public on this potential future use of recycled water at Laguna
Lake, and stay up to date on any regulatory changes that may occur over the coming
years that could impact this proposed use.
City of San Luis Obispo
2017 Recycled Water Master Plan
C-1
Appendix C. Storage Analysis
City of San Luis Obispo
2017 Recycled Water Master Plan
Appendix D. High Priority Irrigation System Retrofit Projects
D-1
Appendix D. High Priority Irrigation System Retrofit Projects
Retrofit Project 1.1
Retrofit Project 1.1 - Estimated Project Cost
Item Quantity Unit Unit Price Extended Price
Installation of new services 4 Connections $4,000 $16,000
On-site retrofit cost 4 Properties $2,500 $10,000
Contingency @ 20% $5,200
Construction Estimate Total $31,200
City of San Luis Obispo
2017 Recycled Water Master Plan
Appendix D. High Priority Irrigation System Retrofit Projects
D-2
Prj. # Address Customer/Common Name AF/Y
Has LDP
Meter?
Ft of Main
Req.
1.1
1490 Descanso Laguna Linda Homeowners 0.92 Y 0
1492 Prefumo Canyon Prefumo Canyon Estates 0.50 Y 0
1496 Prefumo Canyon Prefumo Canyon Estates 0.28 Y 0
1445 Prefumo Canyon Laguna Green Home Assoc 0.80 Y 0
Project 1.1 consists of the relocation of four point of connections that provide irrigation service
to three homeowners associations. The northernmost meter serving the Laguna Linda
Homeowners Association at 1490 Descanso Street could be relocated to an easement that runs
between Laguna Hills Park and the property. This easement is approximately 20 feet from the
existing recycled water main that serves Laguna Hills Park. This property could be retrofitted to
recycled water without working in Los Osos Valley Road and would only require abandonment of
the existing potable water service that currently feeds the irrigation meter at this property.
Projected recycled water demand for this property is approximately one acre-feet per year.
Prefumo Canyon Estates, accessed from Prefumo Canyon Road and Descanso Street, is served by
two irrigation meters at separate sides of the property. Depending on the layout of the irrigation
system it may be possible to consolidate these two meters into a single point of connection at
either the intersection of Los Osos Valley Road and Descanso Street or at the intersection of Los
Osos Valley Road and Prefumo Canyon Road. Consolidation of these two meters and changing
the point of connection would require a new recycled water service line to be run from Los Osos
Valley Road to the new meter location. Without the consolidation of these two meters, two new
service lines would need to be installed on Los Osos Valley Road, each roughly 35 feet long. If
connected to recycled water, both existing potable service lines would need to be abandoned.
Both services are located within the Prefumo Canyon Estates property on privately maintained
roadway. Projected recycled water demand for this property is 0.77 acre-feet per year.
South of Prefumo Canyon Estates is Laguna Green Homeowners Association at 1445 Prefumo
Canyon Road. The landscaping on this property is served by a single irrigation meter which is
located near the center of the property. In order to connect this property to the recycled water
system the meter would need to be relocated through an existing walkway that leads to Los Osos
Valley Road. This relocation would allow for a new 35-foot-long service line to be installed in Los
Osos Valley Road. Abandonment of the existing potable service that currently supplies irrigation
water to this property would be done within the property where the City’s potable water service
lines currently exist. Total projected water demand for this property is 0.80 acre-feet per year.
Combining these three properties into a single project the City and proposed recipients of
recycled water would see significant cost savings as the properties are within close proximity to
one another. The total projected recycled water demand for these three properties is 2.50 acre-
feet per year.
City of San Luis Obispo
2017 Recycled Water Master Plan
Appendix D. High Priority Irrigation System Retrofit Projects
D-3
Retrofit Project 1.2
Retrofit Project 1.2 - Estimated Project Cost
Item Quantity Unit Unit Price Extended Price
Installation of new services 2 Unit $4,000 $8,000
On-site retrofit cost 2 Properties $2,500 $5,000
Contingency @ 20% $2,600
Construction Estimate Total $15,600
Prj. # Address Customer/Common Name AF/Y
Has LDP
Meter?
Ft of Main
Req.
1.2 1106 Oceanaire Windermere Homeowners 1.15 Y 0
11295 Los Osos Valley Cedarwood Inc. / HOA 1.37 Y 0
City of San Luis Obispo
2017 Recycled Water Master Plan
Appendix D. High Priority Irrigation System Retrofit Projects
D-4
Project 1.2 consists of the relocation of two point of connections that provide irrigation to two
home owners associations.
The eastern most meter that serves the Windermere Homeowners Association, at 1106
Oceanaire Drive, could be relocated 90 feet to Los Osos Valley Road. This meter relocation would
allow for a new 60-foot-long service recycled water service line to be installed on Los Osos Valley
Road. This would also require the abandonment of an existing potable water service line within
the privately owned complex. Projected recycled water demand for this property is
approximately 1.15 acre-feet per year.
Directly across Los Osos Valley Road from 1106 Oceanaire is the Cedarwood Homeowners
Association located at 11295 Los Osos Valley Road. The landscaping on this property is served by
a single irrigation meter located near the center of the property. In order to connect this property
to the recycled water distribution system the meter would be relocated to the front of the
property along Los Osos Valley Road. This relocation would allow for the installation of a new 35-
foot-long service line in Los Osos Valley Road. Abandonment of the existing potable service that
currently supplies irrigation water to this property would be done within the Cedarwood Complex
where the City’s potable water service lines currently exist. Total projected recycled water
demand for this property is 1.37 acre-feet per year.
By combining these two properties into a single project the City and proposed recipients of
recycled water would see significant cost savings as the properties are within very close proximity
to one another. Total projected recycled water demand for these three properties is 2.52 acre-
feet per year.
City of San Luis Obispo
2017 Recycled Water Master Plan
Appendix D. High Priority Irrigation System Retrofit Projects
D-5
Retrofit Project 1.3
Retrofit Project 1.3 - Estimated Project Cost
Item Quantity Unit Unit Price Extended Price
Installation of new services 2 Connections $4,000 $8,000
On-site retrofit cost 1 Property $2,500 $2,500
Contingency @ 20% $2,100
Construction Estimate Total $12,600
Prj. # Address Customer/Common Name AF/Y
Has LDP
Meter?
Ft of Main
Req.
1.3 1704 Tonini L-1 De Tolosa Ranch 1.836 Yes None
1704 Tonini L-2 De Tolosa Ranch 1.836 Yes None
City of San Luis Obispo
2017 Recycled Water Master Plan
Appendix D. High Priority Irrigation System Retrofit Projects
D-6
Project 1.3 consists of the connection of two existing landscape meters to recycled water and
abandonment of two existing potable service lines that supply these meters .
Along the north eastern property corner of 1704 Tonini, De Tolosa Ranch, are two existing
landscape meters which feed De Tolosa Ranch’s with potable water for irrigation use. To connect
these two meters to recycled water, the existing services would have to be abandoned in
Madonna Road and two new 15-20 foot recycled water services lines would need to be installed
from the recycled water main in Madonna Road. Projected recycled water demand for this
property is approximately 3.67 acre-feet per year.
Retrofit Project 1.4
City of San Luis Obispo
2017 Recycled Water Master Plan
Appendix D. High Priority Irrigation System Retrofit Projects
D-7
Retrofit Project 1.4 - Estimated Project Cost
Item Quantity Unit Unit Price Extended Price
Installation of new services 2 Unit $4,000 $8,000
On-site retrofit cost 2 Properties $2,500 $5,000
Contingency @ 20% $2,600
Construction Estimate Total $15,600
Prj. # Address Customer/Common Name AF/Y
Has LDP
Meter?
Ft of Main
Req.
1.4 1778 Tonini Rancho Obispo Properties 3.44 Y 0
2000 DeVaul Ranch Rancho Obispo HOA 1.15 Y 0
Project 1.4 consists of the connection of two existing landscape meters to recycled water and the
abandonment of two existing potable service lines that supply these meters. This project would
also require relocation of the two points of connection to Los Osos Valley Road.
Along each side of DeVaul Ranch Road are irrigation meters for 1778 Tonini Street and 2000
DeVaul Ranch Road, both used for the irrigation of Rancho Obispo Properties. In order to connect
these two meters to recycled water the points of connection would need to be moved from
DeVaul Ranch Road to Los Osos Valley Road. This would require the meters to be moved 55 feet
for the southern meter and roughly 140 feet for the northern of the two meters. Along with the
moving of the points of connection, new recycled water service lines would need to be installed
on Los Osos Valley Road. These two service lines would be roughly 100 feet each. Existing potable
water services for these two irrigation meters would need to be abandoned, the location of these
lines on DeVaul Ranch Road would allow for relatively easy abandonments. Projected recycled
water demand from this retrofit project is approximately 4.59 acre-feet per year.
City of San Luis Obispo
2017 Recycled Water Master Plan
Appendix D. High Priority Irrigation System Retrofit Projects
D-8
Retrofit Project 1.5
Retrofit Project 1.5 - Estimated Project Cost
Item Quantity Unit Unit Price Extended Price
Installation of new services 1 Connection $4,000 $4,000
On-site retrofit cost 1 Property $2,000 $2,000
Contingency @ 20% $1,200
Construction Estimate Total $7,200
Prj. # Address Customer/Common Name AF/Y
Has LDP
Meter?
Ft of Main
Req.
1.5 1433 Calle Joaquin Motel 6 1.15 N 0
City of San Luis Obispo
2017 Recycled Water Master Plan
Appendix D. High Priority Irrigation System Retrofit Projects
D-9
Project 1.5 consists of installation and connection of a new landscape meter to recycled water.
There is not currently a separate irrigation meter at this property, therefore the existing line
would not need to be abandoned since it would continue to be used to sup ply potable water to
the hotel. This project would require additional investigation and construction on site to
disconnect the irrigation system from the existing potable water meter in order to tie it into a
newly installed landscape meter.
In order to connect this property to recycled water a new 30 foot recycled water service would
need to be run across Calle Joaquin Road to the location of the new landscape meter installation.
Projected recycled water demand for this property is 1.15 acre-feet per year.
Retrofit Project 1.6
City of San Luis Obispo
2017 Recycled Water Master Plan
Appendix D. High Priority Irrigation System Retrofit Projects
D-10
Retrofit Project 1.6 - Estimated Project Cost
Item Quantity Unit Unit Price Extended Price
Installation of new services 2 Connections $4,000 $8,000
On-site retrofit cost 2 Properties $2,000 $4,000
Contingency @ 20% $2,400
Construction Estimate Total $16,400
Prj. # Address Customer/Common Name AF/Y
Has LDP
Meter?
Ft of Main
Req.
1.6 1585 Calle Joaquin Rose Garden Inn 2.295 N 0
1625 Calle Joaquin Motel 6 2.295 N 0
Project 1.6 consists of the installation and connection of a two new landscape meters on the
recycled water line in Calle Joaquin Road. The properties located at 1585 Calle Joaquin Road and
1625 Calle Joaquin Road do not currently have separate irrigation meters which means the
existing potable water line would not need to be abandoned since they would continue to be
used to supply potable water to the hotels for domestic use. This project would require additional
investigation and construction on site to disconnect th e irrigation systems from the existing
potable water meters in order to tie it into a newly installed landscape meters.
In order to connect these properties to recycled water new 20 foot recycled water services would
need to be run across Calle Joaquin Road to the location of the new landscape meter installation.
Projected recycled water demand for this project is 4.59 acre -feet per year.
City of San Luis Obispo
2017 Recycled Water Master Plan
Appendix D. High Priority Irrigation System Retrofit Projects
D-11
Retrofit Project 1.7
Retrofit Project 1.7 - Estimated Project Cost
Item Quantity Unit Unit Price Extended Price
Installation of new services 2 Connections $4,000 $8,000
On-site retrofit cost 2 Properties $3,500 $7,000
Contingency @ 20% $3,000
Construction Estimate Total $18,000
City of San Luis Obispo
2017 Recycled Water Master Plan
Appendix D. High Priority Irrigation System Retrofit Projects
D-12
Prj. # Address Customer/Common Name AF/Y
Has LDP
Meter?
Ft of Main
Req.
1.7
210 Margarita SLO Non Profit Housing 0.688 N 0
200 Via San Blas LDP Margarita Villa Association 2.754 Y 0
210 Via San Blas LDP Margarita Villa Association 2.065 Y 0
280 Via La Paz LDP Margarita Villa Association 2.065 Y 0
285 Via La Paz LDP Margarita Villa Association 1.377 Y 0
Project 1.7 consists of the consolidation of four existing landscape meters and a point of
connection change for the Margarita Villa Homeowners Association at 285 Via San Blas and the
new installation of a landscape meter for SLO Non-Profit Housing at 210 Margarita Avenue.
In order to connect 210 Margarita Avenue to recycled water a new landscape meter would need
to be installed along with a 50-foot service line to the recycled water main located in Margarita
Avenue. Since there is not currently a separate landscape meter at this property, the existing line
could be used entirely for potable use and would not require any type of abandonment.
Margarita Villa Homeowners Association’s landscaping is currently served by four irrigation
meters located within property. In order to make this project feasible, the four meters would
need to be relocated to the entrance of the property along Margarita Avenue where they could
be fed by the existing recycled water main. Depending on the construction of the irrigation
system within the complex, it may be feasible to consolidate these meters and serve the property
from two points of connection rather than four. If consolidated and moved to the entrance of
the property, the four existing potable services would need to be abandoned in Via La Paz and
Via San Blas and two new 30-foot-long recycled water service lines would need to be installed
along with new meters.
Projected recycled water demand for this project is roughly 8.95 acre-feet per year.
City of San Luis Obispo
2017 Recycled Water Master Plan
Appendix D. High Priority Irrigation System Retrofit Projects
D-13
Retrofit Project 1.8
Retrofit Project 1.8 - Estimated Project Cost
Item Quantity Unit Unit Price Extended Price
Installation of new services 3 Connections $4,000 $12,000
On-site retrofit cost 3 Properties $2,000 $6,000
Contingency @ 20% $2,400
Construction Estimate Total $20,400
Prj. # Address Customer/Common Name AF/Y
Has LDP
Meter?
Ft of Main
Req.
1.8
711 Tank Farm LDP Tank Farm Properties 1.377 Y 0
715 Tank Farm LDP Tank Farm Properties 0.459 Y 0
735 Tank Farm LDP Edna Valley Office BLDG 1.606 Y 0
City of San Luis Obispo
2017 Recycled Water Master Plan
Appendix D. High Priority Irrigation System Retrofit Projects
D-14
Project 1.8 consists of the connection of existing irrigation meters at 711 Tank Farm, 715 Tank
Farm, and 735 Tank Farm to the existing recycled water main in Tank Farm Road.
In order to connect these three properties, existing potable services that currently feed th ese
three meters will need to be abandoned in Tank Farm Road and three new 20-foot-long recycled
water services will need to be tied into existing irrigation meters.
Projected recycled water demand for this project is roughly 3.44 acre-feet per year.
Retrofit Project 1.9
City of San Luis Obispo
2017 Recycled Water Master Plan
Appendix D. High Priority Irrigation System Retrofit Projects
D-15
Retrofit Project 1.9 - Estimated Project Cost
Item Quantity Unit Unit Price Extended Price
Installation of new services 4 Connections $4,000 $16,000
On-site retrofit cost 4 Properties $2,000 $8,000
Contingency @ 20% $4,800
Construction Estimate Total $28,800
Prj. # Address Customer/Common Name AF/Y
Has LDP
Meter?
Ft of Main
Req.
1.9
899 Columbine LDP REG/Santa Lucia Hills 3.098 Y 0
945 Tank Farm L-B SLO City Parks 1.147 Y 0
946 Tank Farm L-A Willowbrook II HOA 2.984 Y 0
944 Felicia LDP Willowbrook II HOA 1.182 Y 0
Project 1.9 consists of the connection of two existing irrigation meters at 945 Tank Farm to the
existing recycled water main in Tank Farm Road and the relocation of the points of connection of
899 Columbine Court and 944 Felicia Way.
In order to connect Santa Lucia Hills Homeowners Association at 899 Columbine to the existing
recycled water main, the existing landscape meter at the end of Columbine Way would need to
be relocated to the front of the HOA-owned walkway at Tank Farm Road. This relocation would
require the abandonment of the existing potable service in Columbine Way and would require a
new 55-foot-long service line in Tank Farm Road. Privately owned irrigation system would need
to be modified to accommodate the new point of connection.
Similar to the meter on Columbine, the existing landscape meter at 944 Felicia Way would need
to be relocated to the frontage of the property along Tank Farm Road. This relocation would
require abandonment of the existing potable service line in Felicia Way and would require a new
55-foot-long recycled water service line to be run from the recycled water main in Tank Farm to
the new meter location. Privately owned irrigation system would need to be modified to
accommodate the new point of connection.
The two existing landscape meters located at 945 Tank Farm Road serve properties owned and
maintained by the City of San Luis Obispo and Willowbrook II Homeowners Association. In order
to connect these existing landscape meters to recycled water, two new 15 -foot-long recycled
water service lines would need to be installed in Tank Farm Road and existing potable service
lines to these meters in Tank Farm Road would need to be abandoned. No private irrigation
system modifications would need to be made. The total projected recycled water demand for
this project is 8.41 acre-feet.
City of San Luis Obispo
2017 Recycled Water Master Plan
Appendix D. High Priority Irrigation System Retrofit Projects
D-16
Retrofit Project 1.10
Retrofit Project 1.10 - Estimated Project Cost
Item Quantity Unit
Unit
Price
Extended
Price
Installation of new services 4 Connections $4,000 $16,000
On-site retrofit cost 4 Properties $2,000 $8,000
Contingency @ 20% $4,800
Construction Estimate Total $28,800
Prj. # Address Customer/Common Name AF/Y
Has LDP
Meter?
Ft of Main
Req.
1.10 1096 Sunrose LDP REG/Willowcreek HOA 2.065 Y 0
1024 Tank Farm LDP SLO City Parks 0.114 Y 0
City of San Luis Obispo
2017 Recycled Water Master Plan
Appendix D. High Priority Irrigation System Retrofit Projects
D-17
949 Bluebell LDP Summerhills HOA 4.131 Y 0
1055 Bluebell LDP Summerhills HOA 2.065 Y 0
Project 1.10 consists of the connection of one existing irrigation meter at 1024 Tank Farm to the
existing recycled water main in Tank Farm Road and the relocation of the points of connection of
1096 Sunrose Court, 1055 Bluebell Way and 949 Bluebell Way.
In order to connect the City owned landscape meter at 1024 Tank Farm Road to the existing
recycled water main, a 50-foot-long recycled water service line would need to be installed in Tank
Farm Road along with the abandonment of the existing potable service line in Tan k Farm Road.
Relocating the point of connection for Willowcreek Homeowners Association at 1096 Sunrose
Court would require the current landscape meter to be moved to the front of the property along
Tank Farm Road. This would require the installation of a 50-foot-long recycled water service line,
abandonment of the existing potable service line in Sunrose Court, and potential modifications
to privately owned irrigation lines.
Relocating the two points of connection for Summerhills Homeowners Association at 1 1055
Bluebell way and 949 Bluebell Way would require the current landscape meters to be moved to
the entrance of the property along Morning Glory Way. This would require the installation of one
ten-foot-long recycled water service line for 949 Bluebell way and a 40-foot-long recycled water
service line for 1055 Bluebell Way. Abandonment of the existing potable service lines in Bluebell
Way would also be required along with potential modifications to privately owned irrigation
piping.
The total projected recycled water demand for this project is 8.37 acre-feet.
City of San Luis Obispo
2017 Recycled Water Master Plan
Appendix D. High Priority Irrigation System Retrofit Projects
D-18
Retrofit Project 1.11
Retrofit Project 1.11 - Estimated Project Cost
Item Quantity Unit Unit Price Extended Price
Installation of new services 3 Connections $4,000 $12,000
On-site retrofit cost 3 Properties $2,500 $7,500
Contingency @ 20% $3,900
Construction Estimate Total $23,400
Prj. # Address Customer/Common Name AF/Y
Has LDP
Meter?
Ft of Main
Req.
1.11
1102 Ironbark LDP Islay Hills Associates 1.193 Y 0
1223 Manzanita LDP Islay Pointe HOA 1.721 Y 0
1280 Chaparral LDP Islay Pointe HOA 3.558 Y 0
City of San Luis Obispo
2017 Recycled Water Master Plan
Appendix D. High Priority Irrigation System Retrofit Projects
D-19
Project 1.11 consists of the relocation of the points of connection of 1102 Ironbark Street which
is owned by the Islay Hills Homeowners Association and two meters owned by Islay Pointe
Homeowners Association at 1223 Manzanita and 1280 Chaparral.
In order to connect the existing landscape meter at 1102 Ironbark Street to the recycled water
main in Tank Farm Road, the point of connection for this meter would need to be relocated to
the front of the back of the property along Tank Farm Road. A 70-foot-long recycled water service
line would need to be installed in Tank Farm Road along with the abandonment of the existing
potable service line in Ironbark. This property would require changes to the irrigation piping in
order to facilitate the new point of connection location .
Relocating the point of connection for the two meters owned by Islay Pointe Homeowners
Association would require the current landscape meters to be moved to the north side of the
property along Tank Farm Road. This would require the installation of a 70-foot-long recycled
water service line for each of the two meters and abandonment of the existing potable service
lines in Manzanita and Chaparral. Potential modifications to privately owned irrigation lines
would likely be required due to the point of connection changes.
The total projected recycled water demand for this project is 6.47 acre -feet.
City of San Luis Obispo
2017 Recycled Water Master Plan
Appendix D. High Priority Irrigation System Retrofit Projects
D-20
Retrofit Project 1.12
Retrofit Project 1.12 - Estimated Project Cost
Item Quantity Unit Unit Price Extended Price
Installation of new service lines 3 Connections $4,000 $12,000
On-site retrofit cost 3 Properties $1,500 $4,500
Contingency @ 20% $3,300
Construction Estimate Total $19,800
Prj. # Address Customer/Common Name AF/Y
Has LDP
Meter?
Ft of Main
Req.
1.12
3590 Broad LDP Broad St Owners Assoc. 1.730 Y 0
3588 Broad LDP Broad St Community Assoc. 5.050 Y 0
3586 Broad LDP Sacramento Owners Assoc. 3.558 Y 0
City of San Luis Obispo
2017 Recycled Water Master Plan
Appendix D. High Priority Irrigation System Retrofit Projects
D-21
Project 1.12 consists of the connection of three existing landscape meters to the recycled water
main in Broad Street.
In order to connect the existing landscape meters at 3590, 3588, and 3586 Broad Street to the
recycled water main in Broad Street, the three existing potable service lines within the privately
owned complex must be abandoned and a single service with a manifold or thr ee separate
service lines installed from Broad Street to the current meter locations. These service lines would
be roughly 70 feet in length and there would likely need to be alterations to the irrigation lines
and meters to accommodate the service line feeding from Broad Street.
The total projected recycled water demand for this project is 8.5 acre-feet.
Appendix E. Medium Priority Projects
Project 2.1
Project 2.1 - Estimated Project Cost
Item Quantity Unit Unit Price Extended Price
Installation of new services 2 Connections $4,000 $8,000
On-site retrofit costs 2 Properties $2,500 $5,000
Contingency @ 20% $2,600
Construction Estimate Total $15,600
Prj. # Address Customer/Common Name AF/Y
Has LDP
Meter?
Ft of Main
Req.
2.1 11491 Los Osos Valley Pathpoint / Old SESLOC 0.55 N 0
1351 Royal LDP The Pines HOA 2.30 Y 0
City of San Luis Obispo
2017 Recycled Water Master Plan
Appendix E. Medium Priority Retrofit Projects
E-2
This project consists connecting two new accounts to the recycled water system. This project
could be moved to the high feasibility category if the point of connections could be moved to the
Los Osos Valley Road frontage. If they are unable to be moved to this location additional main
line would need to be added which would make this project significantly less feasible.
In order for this project to be feasible, The Pines Homeowners Association at 1351 Royal Way
would need to have its irrigation system converted to recycled water. To make this happen there
are three options, each with varying cost and each significantly effecting the feasibility of this
project. For the purposes of costing this project the most cost -effective option will be examined.
Option 1: Relocation of irrigation meter from center of complex to Los Osos Valley Road frontage.
This would require abandonment of existing potable water service inside the complex and the
installation of a new 65-foot-long recycled water service line in Los Osos Valley Road. This option
would not require a main line extension.
Option 2: Extension of a 4”-6” inch water main from Los Osos Valley Road 200 feet down Royal
way and the relocation of the existing irrigation meter to the front of the property along Royal
Way. This option would also require abandonment of the existing potable water service line.
Option 3: Extension of a 4”-6” inch water main approximately 150 feet down Royal Way from Los
Osos Valley Road along with an additional 250 -foot-long extension through the private street
where homes at 1351 Royal Way are located. This extension would not require a relocation of
the existing irrigation meter.
In addition to the adding 1351 Royal Way to the recycled water system, 11491 Los Osos Valley
Road could also be added at this time but would only be feasible if a contractor was already
adding infrastructure related to 1351 Royal Way. Connecting 11491 Los Osos Valley Road to the
recycled water system would require the new installation of an irrigation meter on the Los Osos
Valley Road frontage. This would require a new recycled water service line to be installed in Los
Osos Valley Road but no abandonment of existing potable service line as it would continue to
serve this property potable water for use within the building.
Total projected recycled water demand for these two properties is 2.85 acre-feet per year.
City of San Luis Obispo
2017 Recycled Water Master Plan
Appendix E. Medium Priority Retrofit Projects
E-3
Project 2.2
Project 2.2 - Estimated Project Cost – Option 2 ( LOVR-Royal Way Tie-In)
Item Quantity Unit Unit Price Extended Price
Installation of new services 1 Connection $4,000 $4,000
On-site retrofit costs 1 Property $2,500 $2,500
6” Main Line Installation 1050 LF $200 $210,000
Tie-in at LOVR 1 LS $5,000 $5,000
Contingency @ 20% $44,300
Construction Estimate Total $265,800
Prj. # Address Customer/Common Name AF/Y
Has LDP
Meter?
Ft of Main
Req.
2.2 1375 Balboa C.L. Smith Elementary School 10.33 Y 1050
City of San Luis Obispo
2017 Recycled Water Master Plan
Appendix E. Medium Priority Retrofit Projects
E-4
This project consists of serving C.L. Smith Elementary School with recycled water via the
extension of the existing recycled water line on either Madonna Road or Los Osos Valley Road.
Option number one examines the extension from Madonna Road to the front of the property
and option number two examines a main line extension from Los Osos Valley Road to the back
of the property on Galleon Way. C.L. Smith Elementary School currently has separate potable
water meters for irrigation use and domestic use, both are located in front of the property on
Balboa Street.
Option #1:
In order to feed C.L. Smith from Madonna Road a 4” to 6” recycled water main would need to be
installed from Madonna Road at Oceanaire Drive through residential streets, for approximately
2,075 feet. This option would allow for connection to the existing irrigation line on Balboa Street
without relocation of the meter or significant alteration of existing irrigation system.
Option #2:
Another alternative, which would be significantly more cost effective, would to serve the School
from a tie in at the intersection of Royal Way and Los Osos Valley Road. In order for this
alternative route to be feasible, the City would need to seek an expansion of an existing access
easement from Galleon way to the back side of C.L. Smith Elementary School to allow for a
recycled water service line to be run through it. If this easement was feasible, an extension of 4”-
6” main line from Los Osos Valley Road at Royal Way would need to be made. This would require
roughly 800 feet of recycled water main be installed on Royal Way and 250 feet on Galleon Way.
The existing potable connection used for irrigation, located on Balboa Street, would need to be
abandoned and moved to the easement on Galleon way. This would allow for the installation of
a new meter at this location. The location of this new meter would require alteration of on-site
plumbing at the school for a tie in to the irrigation system.
Option number two would also make it possible for this project to be joined with project 2.1,
minimizing the overall cost for both projects.
City of San Luis Obispo
2017 Recycled Water Master Plan
Appendix E. Medium Priority Retrofit Projects
E-5
Project 2.3
Project 2.3 - Estimated Project Cost
Item Quantity Unit Unit Price Extended Price
Installation of new services 1 Connections $4,000 $4,000
On-site retrofit costs 1 Property $2,500 $2,500
6”- 8” Main Line Installation on South
Higuera and LOVR 720 LF $200 $144,000
Tie-in on South Higuera 1 LS $5,000 $5,000
Contingency @ 20% $31,100
Construction Estimate Total $186,600
City of San Luis Obispo
2017 Recycled Water Master Plan
Appendix E. Medium Priority Retrofit Projects
E-6
Prj. # Address Customer/Common Name AF/Y
Has LDP
Meter?
Ft of Main
Req.
2.3
90 Encanto Los Verdes II 1.15 Y
720 20 Perla Los Verdes II 1.61 Y
50 El Mirador Los Verdes II 1.55 Y
51 El Mirador Los Verdes II 1.95 Y
This project consists of extending recycled water main line 720 feet down South Higuera and Los
Osos Valley Road to reach the entrance of Los Verdes II Condos. For this project to be feasible
Los Verdes II would need to abandon four existing potable irrigation meters and consolidate them
into one or two meters at the entrance of the park. This project would not be feasible without
having the meters moved to the front of the property due to the significant cost to extend the
main through the entirety of the privately owned complex.
Project 2.4
City of San Luis Obispo
2017 Recycled Water Master Plan
Appendix E. Medium Priority Retrofit Projects
E-7
Project 2.4 - Estimated Project Cost
Item Quantity Unit Unit Price Extended Price
Installation of new services 2 Connections $4,000 $8,000
On-site retrofit costs 2 Properties $2,000 $4,000
8”- 12” Main Line Installation 800 LF $300 $240,000
Tie-in at Tank Farm/Broad Intersection 1 Unit $5,000 $5,000
Contingency @ 20% $51,400
Construction Estimate Total $308,400
Prj. # Address Customer/Common Name AF/Y
Has LDP
Meter?
Ft of Main
Req.
2.4 4021 Broad Ottano Shell Station 1.26 Y 264
651 Tank Farm Mindbody 1.40 Y 700
Project 2.4 consists of extending 8” – 12” recycled water main from the intersection of Tank Farm
and Broad, south on Tank Farm to serve 4021 Broad and 651 Tank Farm. These two properties
have existing irrigation meters that are currently connected to potable water. This project would
require abandonment of the existing service lines and the installation of two new recycled water
service lines to the existing irrigation meters. There would likely be minimal on-site
improvements necessary with tying these two properties over to the recycled water system.
City of San Luis Obispo
2017 Recycled Water Master Plan
Appendix E. Medium Priority Retrofit Projects
E-8
Project 2.5
Project 2.5 - Estimated Project Cost
Item Quantity Unit Unit Price Extended Price
Installation of new services 2 Connections $4,000 $8,000
On-site retrofit cost 2 Properties $1,500 $3,000
6” Main Line Installation (down Aerovista) 260 LF $200 $52,000
10” Main Line Installation (down Broad) 2,100 LF $300 $630,000
Jack & Bore Creek Crossing at 4147 Broad 100 LF $750 $75,000
Tie in at Broad/Aerovista (6”x10”x10” tee) 1 LS $5,000 $5,000
Tie-in at Tank Farm/Broad (10” cross) 1 LS $10,000 $10,000
Contingency @ 20% $156,060
Construction Estimate Total $936,360
City of San Luis Obispo
2017 Recycled Water Master Plan
Appendix E. Medium Priority Retrofit Projects
E-9
Prj. # Address Customer/Common Name AF/Y
Has LDP
Meter?
Ft of Main
Req.
2.5 892 Aerovista Aerovista LLC 1.03 Y 2360
895 Aerovista Aeroloop LLC 4.59 Y 2360
Project 2.5 consists of installation of roughly 2100 feet of 10” recycled water main line on Broad
Street between Tank Farm and Aerovista along with a 260-foot-long extension down Aerovista
to serve 892 and 895 Aerovista with recycled water for irrigation use. The two properties to be
served have existing irrigation meters that are currently tied into the potable water system. This
project would require the abandonment of the two existing service lines and the connection of
new recycled water service lines to the existing irrigation meters.
Project 2.6
City of San Luis Obispo
2017 Recycled Water Master Plan
Appendix E. Medium Priority Retrofit Projects
E-10
Project 2.6 - Estimated Project Cost
Item Quantity Unit Unit Price Extended Price
Installation of new services 3 Connections $4,000 $12,000
On-site retrofit costs 3 Properties $2,500 $7,500
6” Main Line Installation 1,980 LF $200 $396,000
6” Tie in at Tank Farm/Brookpine 1 Unit $5,000 $5,000
Contingency @ 20% $84,100
Construction Estimate Total $493,800
Prj. # Address Customer/Common Name AF/Y
Has LDP
Meter?
Ft of Main
Req.
2.6
1211 Ironbark Islay Hills Owners 2.47 Y 1340
1341 Purple Sage L-B Rodriguez Adobe Park 3.49 Y 1340
4600 Spanish Oaks Islay Hills Owners 2.66 Y 1980
Project 2.6 consists of the installation of 1,340 – 1,980 feet of six-inch recycled water main to
provide three properties recycled water for irrigation use. In order to serve recycled water to
1211 Ironbark and 1341 Purple Sage, 1,340 feet of six-inch recycled water main would be installed
from Tank Farm Road down Ironbark to the entrance of Rodriguez Adobe Park. 1341 Purple Sage
has an existing irrigation meter which means disconnection and abandonment of the existing
potable service would be required along with running a new recycled water service line to the
existing meter.
To provide recycled water to 1211 Ironbark, the existing service line and meter must be
disconnected from the potable water system at the end of Ironbark Street and the point of
connection must be moved next to the meter for 1341 Purple Sage. This would minimize the
amount of recycled water main that needs to be installed by moving the meter to a location
where recycled water main is proposed to be installed for the other properties associated with
this project. Abandonment of the existing service line and meter on Ironbark would be required
along with the installation of a new recycled water service line and meter at the end of Brookpine.
Connecting 4600 Spanish Oaks would require an additional 640 feet of recycled water main line
be installed on Purple Sage and would require that the current meter and point of connection be
abandoned and moved northwest toward the edge of the Rodriguez Adobe Park. This part of the
project would require abandonment of one potable service and meter and installation of a new
recycled water service and meter along with potential alterations to the existing irrigation system
to accommodate the new point of connection.
City of San Luis Obispo
2017 Recycled Water Master Plan
Appendix E. Medium Priority Retrofit Projects
E-11
Project 2.7
Project 2.7 - Estimated Project Cost
Item Quantity Unit Unit Price Extended Price
Installation of new services 3 Connections $4,000 $12,000
On-site retrofit costs 3 Properties $2,000 $6,000
4” Main Line Installation 485 LF $300 $97,000
4” Tie in on Capitolio 1 Unit $3,500 $3,500
Contingency @ 20% $23,700
Construction Estimate Total $142,200
City of San Luis Obispo
2017 Recycled Water Master Plan
Appendix E. Medium Priority Retrofit Projects
E-12
Prj. # Address Customer/Common Name AF/Y
Has LDP
Meter?
Ft of Main
Req.
2.7
3510 Broad IOMG Inheritence LLC 0.40 Y 0
3550 Broad Broad & Capitolio 2.00 Y 305
775 Capitolio Level 3 Communications 3.33 Y 180
Project 2.7 consists of connecting two existing irrigation meters to recycled water and relocating
a third irrigation meter from Sacramento Drive to Capitolio Way.
In order to connect 3510 Broad to recycled water the existing landscape connection to the
potable water system must be abandoned and a new service line run from the existing 4” recycled
water line in front of the property on Capitolio. The existing meter could be used and would not
require any type of relocation.
Connecting 3550 Broad street to the recycled water system would require an extension of the
existing four-inch recycled water main roughly 305 feet to the current location of the property’s
irrigation meter and to extend the entire frontage of the property . This would also require that
the current potable connection used for irrigation be abandoned and a new service line be run
to the newly installed four-inch recycled water main. The existing irrigation meter could be used
and would not require relocation.
Connecting 775 Capitolio to the recycled water system would require both a main line extension
of roughly 180 feet to extend the entire Capitolio Way frontage and would also require that the
existing potable irrigation meter on Sacramento Drive be moved along the frontage of the
property on Capitolio. This would require abandonment of the existing meter and service line
and running a new recycled water service from the recycled water main in Capitolio. This would
also require the installation of a new water meter in this location.
City of San Luis Obispo
2017 Recycled Water Master Plan
Appendix E. Medium Priority Retrofit Projects
E-13
Project 2.8
Project 2.8 - Estimated Project Cost
Item Quantity Unit Unit Price Extended Price
Installation of new services 3 Units $4,000 $12,000
On-site retrofit costs 3 Properties $2,000 $6,000
4” Main Line Installation 1,760 LF $200 $352,000
4” Tie in on Capitolio 1 Unit $3,500 $3,500
4” Tie in on Sacramento 1 Unit $3,500 $3,500
Contingency @ 20% $75,400
Construction Estimate Total $452,400
City of San Luis Obispo
2017 Recycled Water Master Plan
Appendix E. Medium Priority Retrofit Projects
E-14
Project 2.8 consists of connecting three existing landscape meters that are currently using
potable water to a recycled water line that would be run from Capitolio to an existing dry line at
the intersection of Sacramento and Orcutt.
Connecting 803 Basil to the recycled water system would require an installation of 1,300 feet of
four-inch main line from the intersection of Capitolio and Sacramento to the front of the
property. This property has an existing irrigation meter which would need to be connected to the
recycled water system. This would require abandonment of the existing potable service line and
connection of a new recycled water service to the existing meter.
Connecting 805 Bay Leaf would require an existing 300 feet of four-inch main line be installed
from 803 Basil to the existing irrigation meter location for 805 Bay Leaf. The existing irrigation
meter is connected to potable water which would require abandonment of the existing potable
service line and connection of a new recycled water service to the e xisting irrigation meter.
Connecting 3280 Sacramento would require an additional 160 feet of four-inch main line from
805 Bay Leaf to the existing dry recycled water line near the intersection of Sacramento and
Orcutt. This would require an abandonment of the existing potable service and connection of the
existing meter to the recycled water system via a new service line.
Prj. # Address Customer/Common Name AF/Y
Has LDP
Meter?
Ft of Main
Req.
2.8
803 Basil Avivo HOA 3.44 Y 1,300
805 Bay Leaf Tumbling Waters HOA 2.75 Y 300
3280 Sacramento Creekston HOA 4.59 Y 160
City of San Luis Obispo
2017 Recycled Water Master Plan
Appendix E. Medium Priority Retrofit Projects
E-15
Project 2.9
Project 2.9 - Estimated Project Cost
Item Quantity Unit Unit Price Extended Price
Installation of new services 9 Units $4,000 $36,000
On-site retrofit costs 9 Properties $2,000 $18,000
4” Main Line Installation 1,650 LF $200 $330,000
4” Jack and Bore at UPRR 150 LF $750 $112,500
4” Jack and Bore at Acacia Creek Crossing 75 LF $750 $56,250
4” Tie in on Orcutt 1 Unit $3,500 $3,500
Contingency @ 20% $111,250
Construction Estimate Total $667,500
City of San Luis Obispo
2017 Recycled Water Master Plan
Appendix E. Medium Priority Retrofit Projects
E-16
Prj. # Address
Customer/Common
Name AF/Y
Has LDP
Meter?
Ft of Main
Req.
2.9
1102 Laurel Andre Morris & Buttery 0.95 Y 0
1150 Laurel ESCORP 3.44 Y 300
904 Southwood City of San Luis Obispo 8.03 Y 800
2550 Boulevard Del Campo City of San Luis Obispo 0.73 Y 0
904 Southwood (Concessions) City of San Luis Obispo 6.89 Y 0
2800 Augusta City of San Luis Obispo 4.82 Y 200
1045 Southwood Parkwood Village 4.59 Y 150
1198 Bedford Laurelwood HOA 1.68 Y 1230
2755 Augusta
SLO Coastal Unified School
District 5.28 Y 70
Project 2.9 consists of the connection of nine irrigation meters to recycled water, including
Sinsheimer Park and Johnson Park. In order for this project to be feasible, the section of dry pip
on Orcutt road would need to have been connected to recycled w ater through previously
mentioned projects.
Connecting these nine meters to recycled water would require a jack and bore under the Union
Pacific Railroad and an additional installation of 1,650 feet of four-inch recycled water main along
the bike path, between the two baseball fields within Sinsheimer Park, out the entrance of the
park, and down Southwood Drive to the furthest meter at the intersection of Southwood Drive
and Bedford Court. In order to serve Johnson Park and Sinsheimer Elementary School an
additional section of main line would be required to be run through Johnson Park to where
Johnson Park and the school meet. Sinsheimer Elementary School may not be feasible to connect
if a jack and bore was required to cross under the creek that flows between the school and
Johnson Park.
All of the meters in this project would likely require relocation with the exception of 2800 Augusta
(would still be needed to serve the restrooms) and 904 Southwood Con (still needed to serve
concession stand and bathroom).