HomeMy WebLinkAboutCC AG PKT 2012-07-09 #N `�E SE� gC'�t
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AGENDA STAFF REPORT { ' -
DATE: July 9, 2012
TO: Honorable Mayor and City Council
THRU: Jill R. Ingram, City Manager
FROM: Sean P. Crumby, Assistant City Manager/Public Works
SUBJECT: 2012 WATER MASTER PLAN UPDATE
SUMMARY OF REQUEST:
It is requested that the City Council adopt Resolution No. 6288 approving the
Seal Beach 2012 Water Master Plan Update.
BACKGROUND AND ANALYSIS:
The City of Seal Beach operates a domestic water system serving the City's
residents and businesses. The existing system includes approximately 67.5
miles of transmission and distribution piping, four active wells, two reservoirs,
and two booster pump stations. The City completed its most recent water master
plan in 2003.
Between 2003 and 2012, the City of Seal Beach experienced tremendous
development, including the Pacific Gateway project (50+ acre industrial complex)
and Heron Pointe Homes (64+ residential homes). Additionally, other changes
have occurred since the last master plan. The City has been aggressive with
constructing improvements to its domestic water infrastructure including a new
water well built in 2010 on Lampson Avenue, a water conservation ordinance
was adopted, and in 2008 the City Council adopted an update to its water rate
structure. The 2012 Water Master Plan Update includes:
• Evaluations and updates to the Water Distribution Model of the system;
• Recommendations to improve efficiency both with energy and water
consumption to the system based upon current technology;
• Outlines the remainder of the effective life of components of the system
through historical records and past reports;
• A comprehensive, prioritized Capital Improvement Program with cost
estimates;
• Latest Federal, State, and Local Regulations;
• Most recent status of regulatory permits; and
• A report with backup calculations for an appropriate Capital Buy in Charge
(connection fee).
Agenda Item N
The City of Seal Beach recognizes its responsibility to address its customers'
needs with long range planning efforts. By reviewing its existing water system
and focusing on future needs, the City can continue to maintain a high service
level and reliability in its water system in a cost effective and fiscally responsible
manner. This Water Master Plan has been developed to assist the City in
achieving these objectives.
ENVIRONMENTAL IMPACT:
This project complies with all requirements of the California Environmental
Quality Act (CEQA) and is categorically exempt under section 15301.
LEGAL ANALYSIS:
No legal analysis is required for this item.
FINANCIAL IMPACT:
There is no Financial Impact required for this item
RECOMMENDATION:
It is recommended that the City Council adopt Resolution No. 6288 approving the
Seal Beach 2012 Water Master Plan Update.
SUBMITTED BY: NOTED AND APPROVED:
114 .
Sean P. Crumby, P.E. `� . Ingram, City . ager
Assistant City Manager/ blic Works
Prepared by: David Spitz, Associate Engineer
Attachments:
A. Resolution No. 6288
B. 2012 Water Master Plan Executive Summary
Page 2
RESOLUTION NUMBER 6288
A RESOLUTION OF THE SEAL BEACH CITY COUNCIL
ADOPTING THE 2012 WATER MASTER PLAN UPDATE
WHEREAS, The City of Seal Beach proposes a Water Master Plan Update
which outlines over$33 million in water infrastructure improvements.
THE SEAL BEACH CITY COUNCIL DOES HEREBY RESOLVE:
Section 1. The City Council hereby adopts the 2012 Water Master Plan
Update,which is on file with the City Clerk.
PASSED, APPROVED and ADOPTED by the Seal Beach City Council at a
regular meeting held on the 9th day of July 2012 by the following vote:
AYES: Council Members:
NOES: Council Members:
ABSENT: Council Members:
ABSTAIN: Council Members:
Mayor
ATTEST:
City Clerk
STATE OF CALIFORNIA }
COUNTY OF ORANGE } SS
CITY OF SEAL BEACH }
I, Linda Devine, City Clerk of the City of Seal Beach, do hereby certify that the
foregoing resolution is the original copy of Resolution Number 6288 on file
in the office of the City Clerk, passed, approved, and adopted by the Seal Beach
City Council at a regular meeting held on the 9th day of July , 2012.
City Clerk
SECTION 1
EXECUTIVE SUMMARY
1-1 History and Background
The City of Seal Beach was incorporated in 1915 and has been in operation under its own charter since 1964.
It covers an area of 11.2 square miles along the Pacific coast in the northwest corner of Orange County. The
City's total population was 24,168 in 2010 according to Census information. The California State Department
of Finance estimated the City's population to be 24,215 in 2011.
1-2 Objectives and Scope of Work
The objective of this master plan is to evaluate the City's water supply system with the most current
information and provide a framework for undertaking the construction of new and replacement facilities in an
efficient manner.
1-3 Study Area
The City of Seal Beach is primarily a residential community located along the California coastline in western
Orange County. It is bordered to the north by the City of Los Alamitos and the unincorporated Rossmoor
community; to the east by the Cities of Garden Grove, Westminster, and Huntington Beach; to the south by
the Pacific Ocean and City of Huntington Beach; and to the west by the City of Long Beach (Los Angeles
County).
Topographical Description
The City is relatively flat, except in the Marina Hill Community, where the highest ground elevation is
approximately 57 feet above mean sea level (amsl) along Crestview Avenue, between Crest Drive and
Bayside Drive. The lowest ground elevation is sea level along the beach frontage.
Geology
The 1986 Orange County Hydrology Manual classifies the soils into four (4) hydrologic soil groups: "A", "B",
"C", and "D". Several soil types underlie the study area, with the predominant soil type being silty-loam soils
(Soil Group C),which impede downward movement of water.
Climate
The study area has a Mediterranean-like climate, enjoying plenty of sunshine throughout the year. The period
of April through November is warm to hot and dry with high temperatures of 82 - 84°F and lows of 53 -65°F.
The coolest months are typically December and January, with an average minimum temperature of 46°F.
Heaviest precipitation generally occurs between October and March. The average rainfall between the
1989/1999 fiscal year and the 2006/20007 fiscal year is 10.61 inches.
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Land Use
Excluding the U.S. Naval Weapons Station, the City of Seal Beach is primarily a residential community with
supporting commercial as well as light industrial and institutional land uses. The City is mostly developed with
a mix of residential, commercial, industrial, and public land uses.
According to the 2011 California Department of Finance Housing Estimates, the total number of housing units
within the City is 14,558 with a 10.59 percent vacancy rate.
Population
Since its incorporation in 1915, the City of Seal Beach has grown from a population of 250 to 24,215 in 2011
(California Department of Finance, Demographic Research Unit).
1-4 Water Use
Historic Water Production
The City purchases imported water from Metropolitan Water District of Southern California (MWD) through
Municipal Water District of Orange County (MWDOC) and the West Orange County Water Board (WOCWB).
The imported water supplements the groundwater that the City obtains from the Orange County Groundwater
Basin through its four wells.
The total annual water purchase and groundwater from July 2001 to June 2011 is shown in Table 1-1. Over
the last ten fiscal years, the annual imported water purchase has averaged 1,249 acre feet per year (AFY)
{1.11 million gallons per day (mgd); 774 gallons per minute (gpm); 1.72 cubic feet per second (cfs)}, and the
annual groundwater production has averaged 2,756 AFY{2.46 mgd; 1,708 gpm; 3.81 cfs}.
Table 1-1
Historic Water Production and Purchase (Annual)
Groundwater Total Water
Imported Water Beverly Manor Leisure Bolsa Chica Lampson Total Use
Fiscal Year (AFY) (mgd) (%) (AFY) (mgd) (AFY) (mgd) (AFY) (mgd) (AFY) (mgd) (AFY) (mgd) (%) (AFY) (mgd)
2001-2002 1,361 _ 1.21 32% 790 0.71 690 0.62 1,434 1.28 - - 2,914 2.60 68% 4,275 3.82
2002-2003 1,051 _ 0.94 25% 954 0.85 502 0.45 1,639 1.46 - - 3,095 2.76 75% 4,146 3.70
2003-2004 1,173 1.05 27% 1,076 0.96 400 0.36 1,664 1.49_ - - 3,140 2.80 73% 4,313 3.85
2004-2005 1,505 1.34 38% 847 0.76 378 0.34 1,247 1.11 - - 2,472 2.21 62% 3,978 3.55
2005-2006 1,408 1.26 36% 942 0.84 168 0.15 1,408 1.26 - - 2,518 2.25 64% 3,927 3.51
2006-2007 1,141 1.02 27% 1,191 1.06 265 0.24 1,706 1.52 - - 3,162 2.82 73% 4,303 3.84
2007-2008 919 0.82 23% 1,019 0.91 444 0.40_ 1,645 1.47 - - 3,107 2.77 77% 4,026 3.59
2008-2009 1,180 1.05 30% 701 0.63 510 0.45 1,521 1.36 - - 2,731 2.44 70% 3,911 3.49
2009-2010 1,456 1.30 40% 436 0.39 340 0.30 1,445 1.29 - - 2,221 1.98 60% 3,678 3.28
2010-2011 1,294 1.16 37% 405 0.36 453 0.40 1,208 1.08 139 0.12 2,203 1.97 63% 3,498 3.12
Average 1,249 1.11 31% 836 0.75 415 0.37 1,492 1.33 139 0.12_ 2,756 2.46 69% 4,005 3.58
*Water Data from Seal Beach Water Department
Since the 2006-2007 fiscal year„ the City's total water use has declined from 4,303 AFY to 3,498 AFY. This
reduction is primarily due to a conscientious water conservation effort by the City and its residents
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Water Consumption versus Water Purchase/Production
The City's consumption records from July 2009 to June 2010 were reviewed for the purposes of this master
plan. The Citywide average consumption was estimated at 3,615 AFY{3.22 mgd, 2,240 gpm, 4.99 cfs}.
Unaccounted for water is the difference between the purchase/production and the sum of the individual
customers' consumption. The City typically purchases and produces more water than the quantity measured
by the customer meters. Unaccounted for water may be partly due to the differences in the accuracies of the
large meters which measure purchase and production, and the thousands of small customer meters which
measure sales. Water losses can also be due to unmeasured uses such as water main flushing and other
maintenance related tasks and water leaks.
The water purchase and production records from July 2009 to June 2010 totaled 3,678 AFY{3.28 mgd, 2,278
gpm, 5.08 gpm}. During this study period, approximately 1.7 percent of the water supply was unaccounted
for. This is well within the 10 percent or less industry standard for unaccounted for water.
Monthly Demand Variations
Typical of most Southern California communities, the City's water consumption exhibits a distinct seasonal
pattern. Peak and low monthly consumption occur during the dry summer months and wet winter months,
respectively. The highest and lowest monthly demand factors are 1.36 in August 2007 and 0.59 in February
2010, respectively.
Hourly Demand Variations
The total system diurnal curve exhibits two peaks. The main peak factor is approximately 1.93 and occurs in
the early morning around 1:15 a.m. This peak factor is attributed to high irrigation water usage within the
Leisure World community, which provides the majority of the irrigation between 12:00 a.m. and 5:00 a.m. to
minimize any inconvenience to the community residents. The second peak factor is approximately 1.39 and
occurs around 7:00 a.m. which is typical for a primarily residential community. Two diurnal curves were
developed for this study.
Currently, heavy water usage occurs in the Leisure World community for irrigation between 12:00 a.m. and
5:00 a.m. The demands remain relatively constant throughout the remainder of the day between 6:00 a.m.
and 12:00 a.m. The peak hour demand is approximately 3.84 times the daily average at about 12:45 a.m.
The demand pattern for the remainder of the City is quite typical of predominately residential service areas,
with the peak demands occurring between 6:00 a.m. and 9:00 a.m. The peak hour demand for this portion of
the system is 1.68 times the daily average and occurs at about 7:00 a.m.
System Demand and Peaking Factors
Typically, a water system is designed to meet the maximum demands placed on it. The system components
must be designed to cope with these demands as they occur. Maximum month and maximum day demands
are important factors in sizing a system's supply capability. Maximum day demands usually dictate the
design criteria for both system transmission and storage needs. Peak hour criterion is a measure of the
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system's overall adequacy with respect to its transmission and distribution elements. The City of Seal
Beach's water system demands utilized in this study are shown in Table 1-2.
Table 1-2
Water System Demands and Peaking Factors
Demand Existing Demand Peaking
Descripti (gpm) (mgd) (AFY) Factor
Average
Day 2,169 3.12 3,498 1.00
Max
Month 3,036 4.37 4,897 1.40
Max Week 3,687 5.31 5,947 1.70
Max Day 4,120 5.93 6,646 1.90
Peak Hour, 7,960 11.46 12,839 3.67
Ultimate Demands
The City has identified one (1) planned area in Old Town community southwest of Marina Drive and First
Street. The Bay City Partners LLC currently owns this property and proposes constructing a development
that includes 48 residential units and 6.4 acres of open space land.
Because the City is nearly developed, large increases in population and water demands are not expected. It
is expected that any incremental increase in population and therefore water demands will be offset by the
City's proactive and rigorous conservation efforts (See Section 4-10). Therefore, the ultimate demands are
expected to be similar to the existing demands for this study.
Water Conservation
Water conservation will continue to be an important issue as California's water storage and supply remain at
critically low levels and as legislative mandates for reduced water consumption become law. The Water
Conservation Act of 2009 (SBx7-7), was adopted in November 2009 to reduce the agricultural and urban
water use throughout the State of California. The goal is to reach a 20 percent overall reduction in urban per
capita water use statewide on or before December 31, 2020.
Per the City's 2010 Urban Water Management Plan, the baseline daily per capita water use is set at 151.7
gallons per day per capita (gpcd). The City's 2020 target is 139.5 gpcd. This is an eight percent decrease in
per capita water use. To achieve this target, the City plans to continue its water conservation effort with its
existing demand management measures.
1-5 Water Supply
Sources of Supply
The City's potable water supply consists of imported water from Metropolitan Water District of Southern
California (MWD)through Municipal Water District of Orange County(MWDOC)and the West Orange County
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Water Board (WOCWB) and groundwater from the Orange County Groundwater Basin through the City's four
(4)wells.
Imported Water Supply
MWD is the purveyor of imported water for most of Southern California. It provides supplemental water to 26
member public agencies through a regional distribution network of canals, pipelines, reservoirs, treatment
plants, pump stations, hydropower plants and other appurtenances
Imported water is supplied to Seal Beach by the Municipal Water District of Orange County (MWDOC)via the
West Orange County Water Board (WOCWB), which is a joint powers agency formed in 1955 for the purpose
of providing a dependable imported water supply to its member agencies. The City of Huntington Beach
operates the WOCWB system under contract to the Board, and communicates with MWDOC and MWD for
the requested flows.
Groundwater Supply
The City of Seal Beach has four (4) active wells, which provide groundwater from the Main Orange County
Groundwater Basin. The groundwater basin is approximately 229,000 acres in size and has historically
provided over 300,000 AFY to the residents of Orange County.
1-6 Water System
The City of Seal Beach's domestic water system consists of the following:
D 73.4 Miles of pipe ranging in size from 4-inches to 20-inches in diameter
D 2 Booster pump stations (Navy and Beverly Manor)
D 2 Forebay reservoirs with a total capacity of 7 million gallons (Navy and Beverly Manor)
D 4 Active wells(Leisure World, Beverly Manor, Bolsa Chica,and Lampson Avenue)
D 1 Imported water supply connection (West Orange County Water Board {WOCWB} through
Metropolitan Water District OC-35 Connection)
D Emergency connections with the City of Long Beach, the City of Huntington Beach, the City of
Westminster, and the Golden State Water Company
D Partially completed SCADA system
D 680 fire hydrants
D Approximately 5,677 potable water services
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Pressure Zones
Aside from the Marina Hill community, the study area is generally characterized by flat terrain. Therefore,
multiple pressure zones are not required. The City's water system is a single zone closed system without a
free-water surface. System pressure is maintained through the pressure at the imported water supply
connection, and the pumping at varying speeds based upon demand at the (2) booster pump stations, Bolsa
Chica Well, and Lampson Avenue Well.
Transmission and Distribution System
The potable water system includes 387,690 feet (73.4 miles) of transmission and distribution system pipes
ranging in size from 4-inches to 20-inches in diameter. Less than 2 percent of these mains are 4-inches in
diameter. Approximately 6 percent of the system was constructed before 1960. Approximately 55 percent of
the system was installed during the 1960's, and 22 percent in the 1970's. Approximately 75% of the system
is asbestos cement pipe(ACP).
Emergency Connections
The City has emergency connections with the City of Long Beach, the City of Huntington Beach, the City of
Westminster, and the Golden State Water Company. These emergency connections should not be relied on
as primary sources of supply, but only for emergencies.
Wells
The City of Seal Beach has four (4) active wells, which pump groundwater from the Main Orange County
Groundwater Basin. A summary of the existing groundwater supply is provided in Table 1-3.
Table 1-3
Existing Groundwater Supply Sources
Design
Source Type Stages Capacity TDH(ft) Disinfection Driver
400 HP 525 HP
3,000 gpm On-site Sodium Electric Motor
Bolsa Chica Well Local 5 (4.32 mgd) 300 Hypochlorite Generator wNariable Natural Gas
Speed Drive Engine
Beverly Manor 2,100 gpm On-site Sodium 100 HP
Well Local 4 (3.02 mgd) 252 Hypochlorite Generator N/A Natural Gas
Engine
Sodium Hypochlorite
Leisure World Local 3 3,600 gpm 153 Generator at Beverly 250 HP N/A
Well (5.18 mgd) Manor Booster Station Electric Motor
On-site Sodium 500 HP
Lampson Local 4 3,000 gpm 512 Hypochlorite Generator Electric Motor N/A
Avenue Well (4.32 mgd) at Lampson Avenue wNariable
Station Speed Drive
Booster Pump Stations
The City's water system relies greatly on its two existing booster pump stations to provide adequate system
pressures. The two storage reservoirs act as forebay storage to the booster pump stations.
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Navy Booster Station — The Navy Booster Station pressurizes the distribution system in the Old Town and
Marina Hill communities during high demand periods. The Navy Booster Station was constructed in 1963 and
upgraded in 2007. The pump station and reservoir are located within the U.S. Naval Weapons Station, east
of Seal Beach Boulevard and north of Bolsa Avenue.
Beverly Manor Booster Station— Beverly Manor Booster Station is located south of the San Diego Freeway
and west of Seal Beach Boulevard. The Beverly Manor Pump Station was constructed in 1969. It is located
in the same structure as the Beverly Manor Well.
Reservoirs
The City of Seal Beach owns two forebay reservoirs with a total capacity of 7 MG and a usable capacity of 6.3
MG.
1-7 Service Criteria
Performance criteria is established to evaluate the adequacy of various water system components through a
systematic analysis and to identify necessary improvements to the system for inclusion in a Capital
Improvement Program (CIP). Some criteria, such as service pressures, storage capacity, and sources of
supply are based upon experience and their application is at the discretion of the water purveyor. For the
City, these criteria are generally in accordance with the California Code of Regulations, Title 22. Other
criteria, such as water quality and fire protection, are based on federal, state and local jurisdictional
requirements. A summary of the service criteria for Seal Beach's system is listed in Table 1-4.
Table 1-4
Service Criteria
Description Criteria Existing
Requirement
1. Source of Supply_ _
a. Total Maximum Day Demand 4,120 gpm
- -- - (5.93 mgt_
b. Local Supply Average Day Demand 2,169 gpm
(3.12 mgd)
2. Reservoir Capacity_
a. Operational Storage 35%of Maximum Day Demand (includes an increase of 2.38 MG
15%for submergence over the reservoir outlet pipe)
Seventy Percent of Seven (7)Average Day Demand less
b. Emergency Storage local groundwater well capacity N.A.
c. Fire Suppression Includes an increase of 15%for submergence over the
reservoir outlet pipe
Single Family 2,000 gpm for 2 hours(plus 15%) 0.28 MG
Residential
Multi-Family
Residential 3,000 gpm for 4 hours(plus 15%) 0.83 MG
Schools 3,500 gpm for 4 hours(plus 15%) 0.97 MG
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Commercial/Industrial 4,000 gpm for 4 hours(plus 15%) 1.10 MG
Firm Capacity including well capacity directly pumped into
3. Booster Pump Stations the system, must deliver Maximum Day Demand plus Fire
Flow Demand or Peak Hour Demand, whichever is greater _
Stand-by pump equal in size to the largest duty pump
Flow meters, suction and discharge pressure gauges, and
telemetry equipment for alarm and status notification at
each station
Provisions for emergency power at all stations
4. Minimum Pipe Size 6-inch
5. Maximum Velocities _ 6 fps at Eeak flows(5 fps for PVC)_ ___
10 fps at Fire Flow Demand
6. Static Pressures _ Minimum 50 psi
_ _Desired 60-80 psi _ _______
Maximum 100 psi
7. Dynamic Pressures Minimum 40 psi during Maximum Day Demand
8. Fire Flow Demands
a. Single Family 2,000 gpm for 2 hours with 20 psi residual pressure at fire
Residential hydrant 0.24 MG
b. Multi-Family 3,000 gpm for 4 hours with 20 psi residual pressure at fire 0.72 MG
Residential hydrant
c. Schools 3,500 gpm for 4 hours with 20 psi residual pressure at fire
hydrant 0.84 MG
d. Commercial/ 4,000 gpm for 4 hours with 20 psi residual pressure at fire 0.96 MG
Industrial hydrant
Water Quality
The quality of water served by the City has to be in accordance with the Federal standards as well as the
State of California Department of Public Health (CDPH) standards as set forth in Title 22 of the California
Code of Regulations.
The basic water quality standards are established by the Safe Drinking Water Act(SDWA),which was passed
by the Congress in 1974. Amendments to the SDWA were enacted in 1986 and 1996. The SDWA mandated
the U.S. Environmental Protection Agency (EPA) to develop primary drinking water standards or maximum
contaminant levels (MCL'S) in public water supplies.
The CDPH has the responsibility for the State's drinking water program. It is accountable to the EPA for
enforcement of the SDWA and for adoption of standards that are at least as stringent as that of the EPA.
Since California conducts independent risk assessments, some of its standards are more stringent than the
standards of the Federal Government.
Water quality requirements are described in detail in Section 7 of this report.
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1-8 Hydraulic Model
A computer model of the City's water system was utilized to aid in the evaluation of the adequacy of the
existing facilities.
The features included in the water model are as follows:
D. 73.4 miles of transmission and distribution mains, 4-inches to 20-inches in diameter
• 2 Booster pump stations (Navy and Beverly Manor), 5 pumps total
D. 4 Active wells(Leisure World, Beverly Manor, Boise Chica, and Lampson Avenue),4 pumps total
• 2 Forebay reservoirs with a total capacity of 7 million gallons (Navy and Beverly Manor)
> 1 altitude valve (Navy Reservoir)
> 1 WOCWB connection
> 680 fire hydrants
The demand distribution, diurnal curves, friction coefficients, and pressure controls, were inputted in the City's
model to perform the hydraulic analyses.
Model Calibration
The existing water system model was calibrated by closely matching the demands and pressures to field
measured values. The resulting model can be used to analyze the system under various operating
conditions. The selected calibration day was Monday June 6, 2011.
Demands-The total system demand was set to 3,068 gpm, which was the calculated daily production for the
calibration day.
Pressure Controls-The Bolse Chica Well and the Lampson Avenue Well were operated during the calibration
day. The Navy Booster Pump Station is operated to maintain pressure in the south part of the City during the
high demand periods.
Field Data—Supervisory Control and Data Acquisition (SCADA) data and pressure information was collected
from June 3, 2011 to June 13, 2011 and used in calibrating the 24-hour extended period simulation.
Pressure data loggers were installed on fire hydrants at 12 locations throughout the system. The selected
locations were scattered throughout the service area in order to obtain representative pressure
measurements in all areas of the system.
Calibration Results-The difference between measured pressures and the model output range from 0.2 psi to
3.4 psi. The average difference for all pressure readings was 1.8 psi. The percentage differences ranged
from 0.3 percent to 5.2 percent. On average, the percentage difference was 2.9 percent. Typically, pressure
differences of 5 percent and less are considered to be good indicators of the model's overall accuracy
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Hydrant Flow Testing- Hydrant flow testing was conducted in the field on Wednesday, February 1, 2012 to
further refine the calibrated model. The field testing was performed at seven (7) hydrants by City and AKM
staff. Portable pressure gauges were set up on two (2) nearby hydrants in the vicinity of the flow hydrant.
The static pressures were recorded at each flow hydrant and the nearby hydrants. When the flow hydrant
was opened, the available flows were recorded and the residual pressures were recorded at the two (2)
nearby hydrants. The model was adjusted to reflect the conditions of the hydrant flow testing day. The City-
wide demands, facility flows, facility pressures, and hydrant flows were input into the model to reflect the
actual real-time field results. Following the field flow testing, the recorded pressures were compared to the
model results. If the difference in the pressure drop between the field results and the model results were less
than 5 psi, the model was considered to be representative of the existing system. The model is considered to
be representative of the existing system.
1-9 System Evaluation
The established system criteria, calibrated system computer model, and condition assessment were utilized in
analyzing the system, and evaluating its adequacy. The system model was utilized to analyze the existing
system under average day, maximum day, peak hour, and maximum day plus fire flow conditions.
Existing system deficiencies were identified and mitigation projects were formulated based upon the results of
the model runs and input from City staff. Proposed projects were added in the hydraulic model to test the
operation of the system after their implementation.
A capital improvement program was developed as a result of these analyses. Recommended projects and
cost estimates are discussed in Section 10 of this Master Plan Report.
Source of Supply
The criterion for source of supply is providing one maximum day demand (4,120 gpm). The City is fortunate
to have access to groundwater from the Orange County Main Groundwater Basin, which is managed by
OCWD. One hundred percent(100%)of the City's maximum day demands can be supplied by a combination
of the four(4)groundwater wells, even if imported water is unavailable.
If groundwater is unavailable, the City can supply the maximum day demands with the maximum available
imported water supply from WOCWB (10 cfs or 4,488 gpm), which is 109 percent of the maximum day
demand.
Storacae
For a water system such as the City's, three (3) categories of storage are of importance: fire suppression,
operational, and emergency. The total storage is summarized below:
Fire Suppression 1.10 MG
Operational 2.38 MG
Emerciencv(Available from Groundwater) 0 MG
Total 3.48 MG
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The two existing reservoirs have a total usable volume of 6.3 MG, which is significantly greater than the
required total storage. To further increase its reliability, the City has the capability of utilizing its emergency
connections with the City of Long Beach, the City of Huntington Beach, and the Golden State Water
Company.
The City currently does not require any additional storage. Whenever either reservoir is scheduled to be
replaced, the City should reevaluate its water usage, operations, and redevelopment plans to determine if
additional storage may be required.
Model Runs and System Pressures
The hydraulic model was utilized to analyze the existing system under average day, maximum day, peak
hour, and maximum day plus fire flow conditions.
The hydraulic model was used to analyze for six (6) scenarios which consisted of different combinations of
the City's water sources: Lampson Avenue Well, Bolsa Chica Well, WOCWB turnout, and the Beverly Manor
Booster Pump Station (supplied by Beverly Manor Well and Leisure World Well). All analyses were run with
the Navy Booster Pump Station in operation. The pressure ranges for each of these scenarios under average
day, maximum day, and peak hour maximum day demands is summarized in Table 1-5.
Table 1-5
Scenario System Pressures
Average Day Demands Maximum Day Demands Peak Hour Maximum Day Demands
Pressure Pressure
Range Satisfy 40 psi Pressure Satisfy 40 psi Range
Scenario Facilities in Operation (Psi) Requirement? Range(psi) Requirement? (psi) Satisfy 40 psi Requirement?
Beverly Manor Booster Low pressures are experienced in the Marina
1 Pump Station 48-77 psi Yes 47-76 psi Yes 38-67 psi Hill area only during the early morning hours
WOCWB Connection due to the high irrigational usage by the
Leisure World Community.
Beverly Manor Booster
2 Pump Station 49-78 psi Yes 48-77 psi Yes 42-71 psi Yes
Boise Chica Well
Lampson Avenue Well Low pressures are experienced in the Marina
3 48-77 psi Yes 46-76 psi Yes 32-68 psi Hill area only during the early morning hours
Bolsa Chica Well due to the high irrigational usage by the
Leisure World Community.
Lampson Avenue Well Low pressures are experienced in the Marina
4 - 48-77 psi Yes 46-76 psi Yes 38-68 psi Hill area only during the early morning hours
Beverly Manor Pump Station due to the high irrigational usage by the
Leisure World Community.
Bolsa Chica Well Low pressures are experienced in the Marina
5 48-77 psi Yes 46-75 psi Yes 38-67 psi Hill area only during the early morning hours
due to the high irrigational usage by the
WOCWB Connection Leisure World Community.
Lampson Avenue Well Low pressures are experienced in the Marina
6 48-77 psi Yes 46-75 psi Yes 39-69 psi Hill area only during the early morning hours
due to the high irrigational usage by the
WOCWB Connection Leisure World Community.
Average Day Demand - Pressures during average day demands were above the City's dynamic pressure
criteria(40 psi)throughout the service area.
1-11 City of Seal Beach
R:rptslCity of Seal BeachlWater Master Plan Update Water Master Plan Update
SECTION 1 EXECUTIVE SUMMARY
Maximum Day Demand - The maximum day demand for each of the 6 scenarios did not indicate any
hydraulic deficiencies. System pressures range from 46 psi in the Marina Hill area to 77 psi near the Aquatic
Park.
Maximum Day Peak Hour Demand-Generally, the maximum day peak hour pressures are slightly less than
the 40 psi criteria in the Marina Hill area during peak hour irrigation usage in Leisure World at around 1:15
a.m., when the majority of the residents are asleep. During the typical residential peak at 7:00 a.m., the
hydraulic model indicates that the system is capable of providing the 40 psi requirement in the Marina Hill
area. Should low pressures become a common occurrence, the City may consider utilizing a third source of
water during the maximum month water usage periods.
Maximum Day Demand plus Fire Flow-The fire flow criterion requires a residual pressure of 20 psi at the
fire hydrant outlet. The maximum day demand plus fire flow scenarios revealed one (1) deficieny in the
system where the required residual pressure could not be met.
Since the analyses were conducted for the maximum day period, the model was set up with the Beverly
Manor Well, Beverly Manor Booster Pump Station, Navy Booster Pump Station and the MWD connection in
operation. During a fire flow event,the low pressures at the Lampson Avenue Well or Bolsa Chica Well would
be less than their emergency settings of 40 psi and 38 psi, respectively. As discussed in Section 8-5, the
facilities will respond to provide the necessary water. For the fire flow analysis, the model was also set up
with the Lampson Avenue Well placed into operation.
Fire flow was applied at each hydrant in accordance with the California Fire Code (Table 105.1) and the
criteria established in Section 7-11. In summary, the fire flow applied in a single family residential area is
2,000 gpm; in a multi- family residential area is 3,000 gpm; near a school is 3,500 gpm; in a commercial or
industrial area is 4,000 gpm. If two land uses are present in the same area,the higher fire flow was used.
For most of the model analyses, fire flow was taken at more than one hydrant. This is especially necessary in
commercial and industrial areas where the criterion is 4,000 gpm. The maximum day plus fire flow run
resulted in one deficiency. The residential fire flow demand of 2,000 gpm cannot be provided at the 6-inch
dead end on Harvard Lane, north of Dartmouth Circle. To improve the fire flow demands at this location, it is
recommended that the City provide the following improvements:
➢ Provide an emergency connection with the City of Long Beach at College Park Drive, west of the
San Gabriel River
➢ Replace 471 feet of 6-inch with 8-inch pipe
Transmission and Distribution System
The existing distribution pipes are generally well looped throughout the system, providing redundancy as well
as reliability.
The system velocities are generally within an acceptable range during the average and maximum day
demand periods. During maximum day demands, the maximum velocity is almost 6.2 ft/s near the northern
Leisure World connection and meter,which is slightly greater than the 6 ft/s criteria.
1-12 City of Seal Beach
R:rptslCiry of Seal Beach%WaterMasster Plan Update Water Master Plan Update
SECTION 1 EXECUTIVE SUMMARY
Minor velocity deficiencies are experienced during maximum day plus fire flow analyses. The existing 8-inch
suction and discharge pipes at Navy Booster Pump Station may experience velocities greater than the 10 fps
criteria, if a 4,000 gpm fire flow is required in the southern portion of the City. Other velocity deficiencies may
occur at dead end pipes during a fire flow event.
The expected useful life of the City's water facilities are discussed in Section 9-5. Approximately 29,189 feet
(5.5 miles or 8% of the total system) of pipe are currently older than the expected useful life. An aggressive
annual replacement program is needed to tend to the aging pipes. Many of the pipes in the Old Town
community may be over 90 years old. The replacement program for these pipes have been broken down into
two (2) phases. Phase 1 is of greater priority and consists of 4,152 feet of pipe, which the City has identified
being in poor condition. Phase 2 consists of the remaining 24,795 feet of pipe in the Old Town community.
The Phase 2 projects should be scheduled on a yearly basis, to accommodate the City's available budget.
The City may take advantage of concurrent construction such as street paving or adjacent infrastructure work
when determining the priority of the Phase 2 improvements. There is 1,213 feet of pipe outside the Old Town
community that have exceeded their expected useful lives. These pipes have been addressed directly in the
Capital Improvement Program. The City should verify the pipe material and condition of the pipes that have
exceeded their expected useful lives before initiating the pipeline replacement.
Water Age Analysis
The existing system model was used to determine the age of the water in the system. Water that remains in
a reservoir or in an oversized pipe for an extended period of time may be susceptible to water quality
problems such as trihalomethanes, haloacetic acids, and nitrification.
The hydraulic model was utilized to determine the water age in the system. The existing water system was
analyzed with average day demands. The average water age in the Navy Reservoir and Beverly Manor
Reservoir were estimated as 80 hours (3.3 days) and 84 hours (3.5 days) respectively. The model estimated
that the greatest average water age was approximately 126 hours (5.3 days) in the Sunset Beach community.
From the introduction into the City's system from the City's wells, it is anticipated that it will take approximately
5.3 days to circulate the water to the Sunset Beach community, which is located the furthest from the City's
wells.
The City is in compliance with all Federal and State water quality standards, including those for TTHM and
HAAS, which indicate that the City does not have any problems water age in the system.
1-10 Capital Improvement Program
The Capital Improvement Program (CIP) consists of projects that will enhance the system to meet the
established criteria, properly maintain the system's assets, and replace the facilities that have reached the
end of their expected useful lives. The goal of the CIP is to provide the City with a long-range planning tool
that will allow construction of the recommended projects in an orderly manner to improve the existing system
and provide for any future growth. In order to accomplish this goal, it is necessary to determine the estimated
cost of the needed water system improvements identified in this study, establish a basis and prioritize each of
the projects. The recommended CIP is shown in Table 1-6. Project locations are shown on Figure 1-1.
1-13 City of Seal Beach
R:rptslCiry of Seal BeachlWaterMaster Plan Update Water Master Plan Update
SECTION 1 EXECUTIVE SUMMARY
Cost estimates have been prepared for each recommended project, based upon information from recent
similar projects. The pipeline replacement costs are generally based upon $50 per diameter inch per foot for
the Old Town area and $35 per diameter inch per foot for the remaining areas of the City. The City of Seal
Beach is mostly developed, and there are many existing utilities to consider in future pipeline replacement
projects. Therefore, the costs of replacing water facilities will be generally higher than in an area that is
undeveloped. Construction costs can be expected to fluctuate as changes occur in the economy. These
costs should therefore be reevaluated and updated annually based upon Engineering News Record (ENR)
Index for the Los Angeles area (ENRLA),with the base ENRLA Index of 10,091 for February 2012.
It should be noted that some of the improvements recommended herein are conceptual in nature based on
existing planning information. Therefore, they should not be considered as absolute for final design. Further
analysis and refinement will be necessary prior to commencing work on the final plans, specifications and
estimates package for each project. Detailed preliminary design studies should be prepared to select
the final design projects.
The cost estimates that follow were generated by estimating the quantities of required items for each
improvement, and applying typical unit prices to obtain the total estimated construction costs. An amount
equal to 40 percent is added to the construction cost estimates to cover contingencies, project design,
administration, and construction duration services. The resultant sum is the total estimated project cost. Cost
estimates for each recommended project are shown in Table 1-6. The total Capital Improvement Program
cost is estimated at$33,531,000.
1-14 City of Seal Beach
R:rptslCiry of Seal BeachlWater Master Plan Update Water Master Plan Update
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