Chapter 2 Existing System - Modesto, CA

2-1 City of Modesto

September 2017 Water Master Plan o\c\418\02-14-36\wp\mp\100814_2Ch2

CHAPTER 2

EXISTING WATER SYSTEM

This Chapter describes the City’s existing water distribution system. System information was

obtained through the review of previous reports, maps, plans, operating records, and other

available data provided to West Yost by the City. The following sections of this Chapter describe

the key components of the City’s existing water distribution system:

• Existing Water Service Area

• Existing Water Supplies

• Existing Water System Facilities

2.1 EXISTING WATER SERVICE AREA

The City is located in the Central Valley of California and is the County seat for Stanislaus

County. California State Highways 99, 108, and 132 converge in the heart of the City, and the

Tuolumne River flows west through the City to form the divide between the North and South

Modesto contiguous service areas of the City.

The City is currently the largest retail water supplier in Stanislaus County and has been

providing potable water service to its urban area since 1895 through the purchase and acquisition

of several private water companies. The City’s existing water service area consists of one large

‘contiguous service area’ and several smaller ‘outlying service areas’. The contiguous service

area is primarily defined by the City’s current SOI and also includes Salida, portions of North

Ceres, and several unincorporated Stanislaus County “islands” located within and adjacent to the

City’s SOI. These County islands include Empire, Bret Harte, Shackelford, and West Modesto,

among several others. The outlying service areas are not part of the contiguous service area and

include Grayson, Del Rio, Jennings Treatment Plant, Ceres (Walnut Manor), and portions of

Turlock1. Figure 2-1 shows the City’s existing water service area boundaries for the contiguous

and outlying systems. As shown on Figure 2-1, the City’s contiguous service area is co-terminus

with the City’s SOI boundary except for the Salida and North Ceres areas.

2.2 EXISTING WATER SUPPLIES

The City’s existing water supply portfolio includes surface water and groundwater sources.

The following sections briefly describe these water sources. Additional details regarding these

two water supply sources are provided in Chapter 4. Existing Water Supply.

2.2.1 Surface Water Supply

The City, MID, and the former Del Este Water Company (DEW Co) formed the Modesto

Domestic Water Partnership in the early 1990’s (in 1995, the City acquired the DEW Co) to use

a portion of MID’s surface water rights for municipal uses, and entered into a Treatment and

Delivery Agreement (TDA) to cover the design, construction, commercial operation

1 Effective July 1, 2015, the City no longer provides water service to the communities of Hickman and Waterford.

The water supplies for Hickman and Waterford are now managed by the City of Waterford. The City of Waterford

also owns and operates these two water systems.

Chapter 2 Existing Water System

2-2 City of Modesto


(i.e., governing delivery of treated surface water from MID to the City), and financing for the

Initial Phase (Phase One) of the MRWTP. This new surface water treatment plant, along with

associated storage and delivery facilities, became operational in 1995, and the City has

purchased wholesale treated surface water from MID since. It should be noted that Phase One of

the MRWTP significantly reduced the City’s reliance on groundwater pumping and eliminated

an increasing local groundwater overdraft condition that was emerging at the time.

The MRWTP is owned and operated by MID and, per the original TDA, it delivers an annual

average supply of 30 million gallons per day (mgd) [33,601 af/yr] to the City with a functional

hydraulic peaking capacity up to 42.5 mgd. This treated surface water supply from MID, coupled

with the available groundwater supply (together termed a “conjunctive supply”) is used to meet

the City’s water supply needs for municipal customers in the contiguous service area located

north of the Tuolumne River (this is the southern boundary of MID’s service area).

The MRWTP Phase Two Expansion was completed in early 2016, and will provide the City with

up to an additional 30 mgd of treated surface water supply for a total annual average supply of up

to 60 mgd (67,202 af/yr). The Phase Two Expansion project is projected to provide a near-term

capacity of 10 mgd by 2020 (not accounting for supply reductions due to drought). The supply

available from the MRWTP Phase Two Expansion project to meet City demands is projected to

increase as additional development occurs within the City’s contiguous service area and within

MID’s treated water ‘place of use’. It should be noted that the total 60 mgd capacity is a normal

and wet year annual average, and the MRWTP facility has the ability to provide a peaking

capacity greater than the annual average.2

2.2.2 Groundwater Supply

The City’s groundwater supply wells are located throughout the City’s existing water service

areas, and these wells are located within the San Joaquin Valley Groundwater Basin (Modesto,

Turlock and Delta-Mendota subbasins). The residents within the contiguous service area north of

the Tuolumne River (North Modesto, Salida, and Empire) generally rely on treated surface water

supply from MID year-round, and supplemented with groundwater to meet increased water

demands primarily in the summer months. Water demands from the contiguous service area

located south of the Tuolumne River (South Modesto) and the outlying service areas are met

with groundwater supply year-round.

2 Peaking capacity for the Phase Two Expansion will be determined after start-up operations and testing protocols

are completed.


2-3 City of Modesto


2.3 EXISTING WATER SYSTEM FACILITIES

The following sections detail the existing water system facilities that serve the City’s existing

water service areas. Facilities for the contiguous service area are presented first, followed by the

facilities for the outlying service areas. A summary of the existing water system facilities for the

outlying service areas is only presented below for completeness, and their respective system

evaluations are included as separate appendices. The subsequent chapters for this WMP report

focus on evaluations for the contiguous service area only.

Figure 2-2 illustrates the existing water system facilities within the City’s water service area

(including the outlying water systems). Figure 2-3 illustrates only the existing water system

facilities specifically within the contiguous service area.

2.3.1 Contiguous Service Area

Water system facilities for the contiguous service area consist of groundwater wells, storage

tanks, booster pump stations, Tier 1 and 2 Turnouts, and pipelines. A summary for each type of

water system facility is provided below.

2.3.1.1 Groundwater Wells

Table 2-1 summarizes the key characteristics of the City’s existing groundwater wells within the

contiguous service area. The City has a total of 92 existing groundwater wells in the contiguous

service area. Of these wells, 77 are currently active and supplement the treated surface water

supplied from the MRWTP. Table 2-1 also includes the Grogan Park Well, which the City is

currently in the process of designing and is expected to be online mid- to late-2017. These 78

(the existing 77 plus the Grogan Park Well) active groundwater wells in the contiguous service

area have the capacity to supply approximately 107 mgd of groundwater supply. This total

groundwater pumping capacity includes wells that feed directly into the City’s storage tanks

and/or are equipped with various wellhead treatment facilities. The total active well capacity,

which only includes well that are active and discharge directly to the City distribution system, is

approximately 99 mgd.

2.3.1.2 Storage Tanks

Table 2-2summarizes the key characteristics of the City’s existing storage tanks within the

contiguous service area. The contiguous service area contains ten at-grade storage tanks. Eight

are owned and operated by the City, and two are owned and operated by MID. Each storage tank

is equipped with a booster pump station, although the two MID storage tanks supply a single

booster pump station at the MID Terminal Reservoirs site. In addition, the City plans to construct

two additional storage facilities in the near-term; North Tank (Tank 11) and Industrial Tank

(Tank 13). The total existing storage capacity in the contiguous service area is equal to

22.1 million gallons (MG). The planned near-term facilities will add an additional 10 MG,

bringing the total storage capacity in the contiguous service area to 32.1 MG.

Table 2-1. Summary of Existing Groundwater Wells Within the Contiguous Service Area

Well Number(a) Service Area(a) Well Status(b)

Ground Surface

Elevation(a)

,feet

Water Surface

Elevation(a)

,feet Year Drilled(c)

Depth(c)

,feet Gravel Packed(c)

Pump Capacity(c)

,gpm Pump HP(c)

Standby

Generator(a)

1 North Modesto Active 93.3 38.3 1954 118 No 950 752 North Modesto Out of Service 88.7 41.2 1976 255 No 1,500 1503 North Modesto Out of Service 88.7 40.2 1956 138 Yes 650 1004 North Modesto Active 89.8 41.4 1933 225 No 950 1006 North Modesto Active 89.0 36.0 1921 234 No 950 757 North Modesto Active 90.4 43.4 1922 260 No 950 7510 North Modesto Active 87.7 39.7 1939 110 No 400 6014 North Modesto Out of Service 89.2 47.2 1948 263 No 1,500 100 Yes16 North Modesto Active 90.8 50.8 1976 312 No 1,800 15017 North Modesto Active 89.1 49.6 1954 232 No 1,450 10018 North Modesto Out of Service 98.1 43.6 1956 250 No 750 10021 North Modesto Out of Service 93.1 52.6 1959 320 No 1,500 12522 North Modesto Out of Service 81.0 52.0 1960 280 No 1,000 12525 North Modesto Active 90.9 54.9 1962 395 No 1,500 125 Yes29 South Modesto Active 74.2 39.2 1964 144 No 1,058 75 Yes30 South Modesto Active 78.9 43.7 1964 123 No 1,000 7533 North Modesto Active 81.2 54.2 1966 380 No 1,800 150 Yes36 North Modesto Out of Service 84.7 39.2 1968 158 No 1,050 10037 North Modesto Out of Service 97.4 52.3 1970 228 No 1,250 12538 South Modesto Active 84.4 49.3 1971 252 No 1,163 10039 North Modesto Active 102.3 59.8 1972 292 No 1,950 15040 North Modesto Active 104.7 40.5 1974 275 No 1,400 150 Yes41 North Modesto Active 112.6 52.5 1976 248 No 1,200 150 Yes42 North Modesto Active 82.2 50.7 1976 430 No 1,800 150 Yes43 North Modesto Active 90.9 56.4 1977 321 No 1,900 150 Yes45 North Modesto Active 117.0 61.5 1985 292 No 1,500 12546 North Modesto Active 104.4 55.9 1985 329 No 1,150 7547 North Modesto Active 108.0 44.3 1985 280 No 1,600 15048 North Modesto Active 100.1 58.1 1990 500 Yes 1,330 15049 South Modesto Active 84.5 47.5 1984 266 No 500 75 Yes50 North Modesto Active 94.2 47.7 2000 295 Yes 800 10051 North Modesto Active 83.6 51.6 1990 470 Yes 2,200 25052 North Modesto Active 105.5 62.0 1992 280 Yes 1,600 150 Yes53 North Modesto Out of Service 82.6 41.4 1992 255 Yes 1,500 10054 North Modesto Active 107.1 65.6 1993 472 Yes 2,400 200 Yes56 North Modesto Active 82.4 47.8 1964 250 Yes 650 7557 North Modesto Active 91.8 37.3 1994 200 Yes 1,350 100 Yes58 North Modesto Active 96.7 54.7 1994 500 Yes 1,300 10059 North Modesto Active 112.4 43.9 1995 265 Yes 1,400 12561 North Modesto Active 85.4 48.6 2006 422 Yes 1,575 20062 North Modesto Active 111.1 58.1 2004 390 Yes 2,200 20063 North Modesto Active 77.3 34.8 2006 500 Yes 1,845 20064 North Modesto Active 84.8 54.2 2005 430 Yes 1,800 20065 North Modesto Active 101.7 52.7 2000 379 Yes 2,000 200 Yes66 South Modesto Active 79.3 47.1 2006 460 Yes 1,350 200100 South Modesto Out of Service 88.3 47.6 1958 127 No 650 40204 North Modesto Active 103.0 40.4 1954 256 No 1,450 150211 North Modesto Active 96.9 41.6 1974 215 No 1,450 100212 North Modesto Active 105.3 33.6 1973 169 No 1,000 100214 South Modesto Out of Service 98.6 39.6 1964/90 162 No 400 40216 South Modesto Active 89.7 38.3 1960/88 200 No 550 40217 South Modesto Active 88.4 41.3 1949/72 232 No 400 40223 South Modesto Active 91.0 45.2 1940 134 No 400 40225 North Modesto Active 99.0 35.7 1946/56 320 No 1,200 150 Yes226 North Modesto Out of Service 81.7 53.7 1963 235 No 675 40229 North Modesto Active 85.2 43.5 1950/85 230 No 425 50232 North Modesto Out of Service 72.9 43.4 1949 81 Yes 775 75236 North Modesto Active 83.6 47.2 1950 224 No 750 75237 North Modesto Active 80.6 47.4 1960/86/87 300 No 630 40241 North Modesto Active 77.9 50.4 1953 217 No 350 40247 North Modesto Active 119.0 53.6 1964 225 No 560 40250 North Modesto Active 69.1 44.6 1949/85 246 No 835 75259 North Modesto Active 99.8 56.8 1960/78 344 No 400 40262 North Modesto Active 92.9 52.9 1954/75 290 No 350 40264 North Modesto Active 94.5 60.0 1958/83 428 No 700 40265 North Modesto Active 110.3 49.8 1960 300 No 500 40267 North Modesto Active 97.0 48.0 1951 270 No 1,190 100269 North Modesto Active 100.1 46.1 1959 265 No 750 50277 North Modesto Active 113.5 42.3 1976 257 No 1,000 100278 North Modesto Active 98.3 43.3 1972 270 No 800 100279 North Modesto Active 99.7 29.0 1971 208 No 800 100 Yes281 North Modesto Out of Service 75.5 48.6 1979 365 No 480 100283 North Modesto Active 83.4 45.2 1980 165 No 800 75284 South Modesto Active 94.0 38.1 1981 224 No 750 75285 North Modesto Out of Service 117.3 49.8 1984 300 No 1,000 100 Yes287 South Modesto Active 89.9 40.5 1954 102 Yes 750 75288 North Modesto Active 67.8 42.7 1986 230 No 650 50290 North Modesto Active 71.7 45.6 1987 304 No 633 50291 North Modesto Active 105.9 25.7 1988 268 No 500 75292 North Modesto Active 105.7 26.3 1988 267 No 850 75297 North Modesto Active 72.3 43.9 2000 322 No 1,300 100298 North Modesto Active 70.1 42.7 1990 324 No 1,200 100 Yes299 North Modesto Active 71.3 43.8 1990 258 No 450 100 Yes300 North Modesto Active 97.0 48.0 1990 368 No 700 75301 North Modesto Active 78.4 48.9 1991 156 No 500 40304 North Modesto Active 78.4 48.9 1991 172 No 525 40 Yes305 South Modesto Active 91.7 39.3 1991 344 No 750 75307 North Modesto Active 100.3 37.4 1993 268 No 1,050 100308 North Modesto Active 105.3 31.2 1993 256 No 850 75310 North Modesto Active 116.2 46.5 1994 330 No 1,320 150 Yes312 North Modesto Active 120.0 47.8 2002 355 Yes 1,000 100313 North Modesto Active 71.5 46.5 2000 322 Yes

New Well online 2016, need information from Jack1,175 100 Yes

gpm

mgdTotal Pumping Capacity of All Wells:

97,694

141

gpm

mgdTotal Pumping Capacity of Active Wells:

83,014

120Indicates that data is missing or not provided and will be updated as more information is received.

(a) Data obtained from GPS_Wells.shp provided by the City on 10/09/2014.

(b) Well Status provided by City staff on 10/21/2014.

(c) Data obtained from Facilities Inventory TM presented in 2010 Engineer's Report. Pump Capacities to be updated when pump efficiency data is received.

o\c\418\02-14-36\e\t110\Ch2_tables.xlsx

Last Revised: 11-17-14

City of ModestoWater Master Plan

Table 2-2. Summary of Existing Storage Tanks Within the Contiguous Service Area(a)

Tank Name

Tank Capacity,

MG Service Area

Construction

Year

Tank Material

Type

Diameter,

feet

Base

Elevation,

feet

Overflow

Level,

feet

Tank 3 1.3 South Modesto 1993 Steel 95.0 73.8 24.5

Tank 4 1.3 North Modesto 1995 Steel 95.0 108.1 24.5






Tank 11(b) 6.0 North Modesto 2016

Pre-Stressed

Partially Buried200.0 81.5 28.0


Tank 13(c) 4.0 North Modesto -

Pre-Stressed

Concrete 180.0 115.0 22.5

MID Terminal Reservoirs(d,e) 10.0 North Modesto 1995 Steel 146.0 113.0 39.5

Existing Storage Capacity(f) 22.1

Existing and Near Term

Storage Capacity32.1

: Indicates Near Term Facilities (a)

Data obtained from Facilities Inventory TM presented in 2010 Engineer's Report.(b)

Data for Tank 11, or "North Tank", was obtained from a review design drawings dated March 2015 (10D-116) and is expected to be operational in fall of 2016.(c)

Data for Tank 13, or "Industrial Tank", was obtained from a review of design drawings dated June 2016 (10D-120).(d)

Tank capacity based on the combination of two reservoirs at 5.0 MG each.(e)

Data obtained through a review of the available as-builts.(f)

Total does not include Tank 11 (North Tank) and Tank 13 (Industrial Tank).



City of Modesto

Water Master Plan


2-6 City of Modesto


2.3.1.3 Booster Pump Stations

Table 2-3 summarizes the key characteristics of the City’s existing booster pump stations within the

contiguous service area. Within the contiguous service area, there are nine active and two planned

near-term booster pump stations. Ten of these are/will be located at each of the City-owned storage

tanks and are owned and operated by the City. MID owns and operates the booster pump station

that supplies water to the system from MID’s Terminal Reservoirs site. The total existing booster

pump station capacity for the contiguous service area is 119,375 gallons per minute (gpm) or about

172 mgd. The total existing firm booster pumping capacity, with the largest pump reserved as a

standby unit at each pump station, is 90,555 gpm, or about 130 mgd. The total and firm booster

pump station capacity once near-term facilities are completed (i.e., Tank 11 and 13 booster pump

stations) increases to 147,283 gpm (212 mgd) and 111,486 gpm (161 mgd), respectively.

2.3.1.4 Tier 1 and 2 Turnouts from the MID Transmission System

Table 2-4 summarizes the key characteristics of the City’s existing Tier 1 and 2 Turnouts within

the contiguous service area. Within the contiguous service area, there are 14 active turnouts

constructed as part of the Tier 1 Downstream Improvements (completed in early 2008). An

additional 11 turnouts were recently constructed (as of late 2015/early 2016) as part of the Tier 2

improvements. These turnouts have the ability to control the surface water supply from the

MRWTP via MID transmission mains at various points within the City’s water distribution system.

Each turnout is equipped with a hydraulically operated control valve, which can be operated to

maintain a predetermined set point pressure or flow. However, based on conversations with City

Water Operations staff, the control valves are currently operating wide open without flow or

pressure control. Once additional treated surface water supply is available from the MRWTP Phase

Two Expansion, these turnouts can be controlled to provide the City with operational flexibility.

2.3.1.5 Pipelines

Table 2-5 and Table 2-6 summarize the key characteristics of the existing pipelines within the

contiguous service area by diameter and by material type, respectively.3 The City’s existing

water system consists of approximately 914 miles of water system pipelines. The pipelines can

be classified as either distribution pipelines or transmission mains. Distribution pipeline sizes

generally range from 2 to 12-inches in diameter, while the larger transmission mains range from

12 to 24-inches in diameter. A portion of the transmission mains is owned and operated by MID,

and these transmission mains provide treated surface water either directly into the water system

or through a number of turnouts, as discussed above. The MID-owned transmission mains range

from 24 to 60-inches in diameter. The older pipelines, generally located in the Downtown and in

the former Del Este Water Company service areas, are primarily constructed of cast iron, welded

steel, or asbestos cement. In some locations, ductile iron and reinforced concrete pipe are found

in mains larger than 16-inches in diameter. As shown in Tables 2-5 and 2-6, the City’s existing

water system pipelines in the contiguous service areas primarily consist of 6 to 8-inch diameter

pipelines that are either asbestos cement (AC) or polyvinyl chloride (PVC).

3 Pipeline statistics presented in Tables 2-5 and 2-6 are based on the Water_MainLine.shp, provided by the City on

10/23/2014.

Table 2-3. Summary of Existing Booster Pump Stations Within the Contiguous Service Area(a)

Rated Total

Existing Pumping Capacity(g) gpm 119,375 90,555

-mgd 172 130

Existing and Near Term Pumping Capacity gpm 147,283 111,486

mgd 212 161

Pump Station Name Service Area Pump Number Pump HP gpm feet gpm gpm Generator

Nominal Pump Dynamic Total Pumping Firm Pumping

Capacity, Head, Capacity, Capacity , Standby (b)

P1 30 600 148

P2 30 600 148(c)

P3 30 600 148

P4 30 600 148

P1 40 950 300

P2 40 950 300

P3 40 950 300

P4 40 910 300

P1 40 950 300

P2 40 900 300

P3 40 950 300

P4 40 950 300

P1 125 2,475 150

P2 125 2,460 150Tank 6 South Modesto 7,450 Yes4,935

P3 125 2,515 150

P1 125 2,450 150


P3 125 2,450 150

P1 125 2,570 150


P3 125 2,570 150

P1 105 2,085 152


P3 100 2,085 152

P1 250 4,200 160

P2 250 4,200 160(d)

P3 250 4,200 160

P4 250 4,200 160

P1 150 2,800 150

P2 150 2,800 150

P3 150 2,800 150

P4 150 2,800 150

P1 200 2,777 150

P2 200 2,777 150(e)

P3 200 2,777 150

P4 200 2,777 150

P1 800 13,900 175

P2 800 13,900 175

P3 400 6,950 175MID Terminal

P4 400 6,950 175Reservoirs

P5 800 13,900 175

P6 800 13,900 175

: Indicates Near Term Facilities

(a) Data obtained from Facilities Inventory TM presented in 2010 Engineer's Report.

(b) Firm pumping capacity is defined as the total pumping capacity with the largest pump unit out of service.

(c) Data obtained through a review of the available pump curves.

(d) Data obtained from recent pump curve, dated 06/02/2015 from Flowserve (Type: 18ENL, Curver: EC-1455).

(e) Data obtained from recent Pump Selection/curve, dated 11/30/2010 from American-Marsh Pumps (Type:340_HSC, Curve: CS-15550).

(g) Total does not include Tank 11 (North Tank) and Tank 13 (Industrial Tank).

(f) Actual firm capacity based on existing pumps at MID's Terminal Reservoir Booster Pump Station is 55,600 gpm (80 mgd). However, the existing firm capacity is limited to the

MRWTP Phase I peaking capacity of 42.5 mgd (see Chapter 8).

16,800 12,600 YesTank 11 North Modesto

Tank 13 North Modesto 11,108 8,331 Yes

(f) North Modesto 69,500 55,600 Yes

North Modesto YesTank 12 8,40011,200

Tank 5 North Modesto Yes2,8003,750

Tank 3 South Modesto 2,400 Yes1,800

Tank 4 North Modesto 3,760 Yes2,810

o\c\418\02-14-36\e\t110\Ch2_tables.xlsxLast Revised: 01-30-17


Table 2-4. Summary of Existing Turnouts Within the Contiguous Service Area(a,b)

Turnout Valve Diameter, Main Diameter, Main Diameter, Current Control

Number inches inches inches SettingLocation Enclosure

Downstream Upstream

Distribution Transmission

1 12 12 24 100% Open Above Ground Metal CaseCreekwood Drive and

Noresemand Drive

2B 24 24 24 100% Open Above Ground Metal CaseYosemite Boulevard and

Frazine Road

3 12 12 48 100% Open Above Ground Metal CaseEast Orangeburg Avenue and

Patriots Lane

4 12 12 48 100% Open Above Ground Metal CaseBriggsmore Avenue and

Claus Road


Claus Road


Roselle Avenue

6 12 12 30 100% Open Above Ground Metal CaseOakdale Road and

Merle Avenue


Floyd Avenue

11 16 16 36 100% Open Above Ground Metal CaseE Briggsmore Avenue and

Coffee Road

11B 24 24 24 Building100% OpenOrangeburg Avenue and

Ford Avenue

12 16 16 36 100% Open Above Ground Metal CaseKimble Street and

Helen Avenue

13 16 16 36 100% Open Above Ground Metal CaseW. Morris Avenue and

Virginia Avenue

17 12 12 24 Vault100% Open S Martin Luther King Drive and

Maze Boulevard

18 12 12 24 Vault100% OpenWestern Way and

Chicago Avenue

9.5B 16 24 24 100% Open Above Ground Metal CaseCoffee Road and

Mable Avenue


Mable Avenue

8C 12 20 30 100% Open Above Ground Metal CaseSylvan Avenue and

Oakdale Road

2A 12 24 24 100% Open Above Ground Metal CaseYosemite Boulevard and

Claus Road

10 10 48 48 100% Open Above Ground Metal CaseEast Briggsmore Avenue and

Rose Avenue

11A 12 36 36 100% Open Above Ground Metal CaseOrangeburg Avenue and

Citrus Drive

14 12 36 36 100% Open Above Ground Metal CaseNellie Avenue and

Needham Avenue

14A 8 36 36 100% Open Above Ground Metal CaseNorth Emerald Avenue and

Laurel Avenue

16 12 24 24 100% Open Above Ground Metal CaseNorth Carpenter Road and

Hillview Drive (MID Lateral 4)

19 10 16 16 100% Open Above Ground Metal CaseSutter Avenue and

Elsie Street

19A 8 16 16 100% Open VaultSutter Avenue and

Pelton Avenue

ier 1 Improvements

ier 2 Improvements

b) Control settings provided by City staff on 11/3/2014.

a) Data based on: (1) Contract Drawings (Jan. 2008) of Downstream Water System Improvements - Tier 1 Priority 1 and 2 Turnouts (08D-00897), and;

(2) April 2014 Bid Set of Downstream Water System Improvements Tier 2 Pressure Regulating Valves (08D-00948).

T

T

(

(



Table 2-5. Summary of Pipeline Lengths by Diameter in the Contiguous Service Area(a)

Pipe Diameter,

inches

Length of Pipelines,

feet

Length of Pipelines,

miles

Percent of

Water System

Unknown 293,022 55 6.07

2 37,013 7 0.77

2.5 825 0 0.02

3 948 0 0.02

4 463,283 88 9.60

6 1,300,995 246 26.97

8 1,433,933 272 29.72

9 2 0 0.00

10 640,330 121 13.27

12 324,733 62 6.73

14 34,184 6 0.71

16 93,148 18 1.93

18 17,809 3 0.37

20 24,648 5 0.51

24 72,420 14 1.50

30 10,354 2 0.21

36 20,928 4 0.43

40 19 0 0.00

48 16,760 3 0.35

60 39,133 7 0.81

Total 4,824,490 914 100(a)

Based on the file entitled "Water_MainLine.shp", provided by the City on 10/23/2014.



Table 2-6. Summary of Pipeline Lengths by Material Type in the Contiguous Service Area(a)

Material Type Acronym Material Type Description

Length of

Pipelines, feet

Length of

Pipelines, miles Percent of Water System

ACO/ACP/ADP/AP/TRANSITE Asbestos Cement 1,784,194 338 36.98

CAP/CIP Cast Iron Pipe 679,546 129 14.09

DIP/DUCT/DUCT MID Ductile Iron Pipe 243,960 46 5.06

GIP Galvanized Iron Pipe 33,397 6 0.69

PCV/PVC/PVC10/C900/SDR Polyvinyl Chloride 1,114,031 211 23.09

STL/STL16 Steel 659,612 125 13.67

Unknown Unknown 309,752 59 6.42

Total 914 100(a)

Based on the file entitled "Water_MainLine.shp", provided by the City on 10/23/2014.




2-11 City of Modesto


2.3.2 Outlying Service Areas

As discussed above, detailed system evaluations pertaining to each of the outlying service areas

are provided as separate appendices (Q, R, S).4&5 A general summary of the major facilities

located within the outlying service areas is provided below.

2.3.2.1 Groundwater Wells

The City has a total of 18 groundwater wells located within all of the outlying service areas.

Of these wells, 17 are currently in production to provide groundwater to their corresponding

service area. Table 2-7 summarizes the key characteristics of the City’s existing groundwater

wells within the outlying service areas.

2.3.2.2 Storage Tanks

The Grayson outlying service area is the only outlying water system that contains an at-grade

storage tank (Tank 9). Tank 9 was constructed in the early 1990’s and is located at the same site

as Well 295, which is one of the two wells that supply the Grayson outlying service area. Table

2-8 summarizes the key characteristics of Tank 9.

2.3.2.3 Booster Pump Stations

The Grayson outlying service area is the only outlying water system that contains a booster

pump station. The pump station is located at Tank 9, and it includes two 50 horsepower booster

pumps (one duty and one backup). Table 2-9 summarizes additional details particular to the

booster pump station at Tank 9.

2.3.2.4 Pipelines

The City has approximately 15.2 miles of pipelines within all of the outlying service areas.

Distribution pipeline sizes generally range from 4 to 10-inches in diameter. Table 2-10

summarizes the key characteristics of the existing pipelines within all of the outlying service

areas. Pipeline lengths and diameters within each of the outlying service areas are discussed in

more detail in Appendices Q, R and S.

4 As previously mentioned, the City no longer provides water service to the communities of Hickman and

Waterford, but for completeness of inventorying the existing facilities, these two-water system’s information is

described in the following subsections. However, these two water systems will not be analyzed in this WMP from a

supply and demand perspective like the other Outlying Areas.

5 Since publication of the Engineer’s Report in 2010, a new outlying water system has been added to the City’s

service areas, in that, an operating permit for the Jennings Wastewater Treatment Plant water system was issued by

the State in May 2013, to operate one well (which produces ~ 25 to 35 gpm) and one 5,500-gallon storage tank for

less than 20 City employees. The system is permitted as a potable system; however, bottled water is supplied to the

site due to the well’s manganese concentration levels being over the maximum contaminant level (MCL).

Table 2-7. Summary of Existing Groundwater Wells Within the Outlying Service Areas

213 Active 101.1 38.7 1978 52 No 242

Total Ceres (Walnut Manor) Service Area Pumping Capacity, gpm -

271 Active 104.0 56.0 1956 284 No 395

282 Active 100.7 57.7 1980 292 No 800 75

289 Active 113.1 55.6 1987/91 368 No 700 75

Total Del Rio Service Area Pumping Capacity, gpm 1,895

274 Active 52.5 34.6 1967 168 No 200

295 Active 43.7 33.4 1989 336 No 350 75

Total Grayson Service Area Pumping Capacity, gpm 550

272 Active 174.2 76.9 1961 332 No 183 30

309 Active 170.0 71.8 1994 160 No 380

Total Hickman Service Area Pumping Capacity, gpm 563

255 Active 104.9 19.2 1950/89 348 No 350

256 Active 108.4 58.1 1967/73 208 No 209

275 Active 108.6 62.3 1973 272 No 300

306 Out of Service 109.6 49.5 - 355 No -

Total Turlock Service Area Pumping Capacity, gpm 859

242 Active 167.2 81.1 1945/85 295 No 325

244 Active 173.9 81.5 1949 259 No 260

245 Active 176.6 78.4 1965 300 No 507

286 Active 164.5 82.3 1984 311 No 648

302 Active 167.3 77.7 1991 237 700(d) 75

303 Active 169.1 82.0 1991 276 800(d) 75

Total Waterford Service Area Pumping Capacity, gpm 3,240 -

25

-

20

Yes

Yes

-

20

Yes

-

Yes

40

-

40

20

40

-

-

40

40

40

75

No Yes

No Yes

-

JWell1 Active

Total Jennings Waste Water Treatment Plant Pumping Capacity, gpm - -

Well Number Well Status feet feet Drilled feet Packed gpm Pump HP Generator(a) (b) (c) (c) (c) (a)

Ground Water

Surface Surface Pump

Elevation , Elevation , Year Depth , Gravel Capacity , Standby (a) (a) (c) (c)

: Indicates that data is missing or not provided and will be updated as more information is received.(a)

Data obtained from GPS_Wells.shp provided by the City on 10/09/2014.(b)

Well Status provided by City staff on 10/21/2014.

(d) Pump equipped with a variable frequency drive (VFD).

Ceres (Walnut Manor)

Del Rio

Grayson

Hickman

Turlock

(c) Year Drilled, Gravel Packed, Pump Capacity, Pump HP Data obtained from associated Outlying Area TMs presented in 2010 Engineer's Report.

Pump capacities were updated to reflect pump efficiency testing (10/2014 - 11/2014) results.

Jennings Waste Water Treatment Plant

Waterford



Table 2-8. Existing Storage Tanks Within the Outlying Service Areas(a)

Tank Name

Tank Capacity(b)

,

MG Service Area

Construction

Year

Tank Material

Type

Diameter,

feet

Base

Elevation,

feet

Overflow

Level,

feet

Tank 9 0.2 Grayson 1990 Steel 42.0 56.0 19.5

Total Storage Capacity 0.2(a)

(b)

Data obtained from the Grayson TM presented in 2010 Engineer's Report

Available storage volume is 0.16 MG due to a minimum operating tank level of 4 feet and an operating range of 15.5 feet.



Table 2-9. Existing Booster Pump Stations Within the Outlying Service Areas(a)

Pump Station Name Service Area Pump Number Pump HP

Nominal Pump

Capacity, gpm

Rated Total

Dynamic Head,

feet

Total Capacity,

gpm

Firm Pumping

Capacity(b)

,

gpm

Standby

Generator

Tank 9 GraysonP1 50 450 -

900 450 YesP2 50 450 -

Total Pumping Capacity 900 450

: Indicates that data is missing or not provided and will be updated as more information is received.(a)

(b)

Data obtained from Grayson TM presented in 2010 Engineer's Report.

Firm pumping capacity is defined as the total pumping capacity with the largest pump unit out of service.



Table 2-10. Summary of Pipeline Lengths by Diameter in the Outlying Service Areas(a)

Length of Pipelines, feet

Del Rio Grayson Turlock

4 310 5,963 10,368

6 4,729 4,415 7,226

8 15,101 5,640 5,984

10 19,761 665 0

Total 39,901 16,683 23,578

Total (miles) 8 3 4(a)

Based on Input by City Staff and the hydraulic models submitted as part of the 2010 Engineer's Report. Refer to Appendices Q, R, and S for more detail.

Pipe Diameter,

inches



City of Modesto

Water Master Plan

0 21

Scale in Miles

Notes1. Sphere of influence boundary obtained from the City

on 11/6/2014.

2. The City's contiguous service area is co-terminus with the

City's SOI boundary except for the Salida and

North Ceres areas.

3. Effective July 1, 2015, the City no longer provides water

service to the communities of Hickman and Waterford.

4. The City's study area boundary represents the maximum

area. The actual boundary will be determined by future

Council action.

5. City limit boundary based on County GIS data downloaded

on October 6, 2014.

FIGURE 2-1City of Modesto

Water Master Plan

WATER SERVICE AREAS

5

SA N JOAQUIN RIV ER

TUO LU M NE RIVER

STANISLA USRIVE R

DRY CREEK

LEGEND

Sphere of Influence

(SOI)

Contiguous Service

Area

Contiguous Area

Outside of SOI

Outlying Service Area

Outlying Service Area

No Longer Served by

City (see Note 3)

Water System Study

Area (see Note 4)

City Limits

Last Saved: 8/23/2017 7:58:08 AM bvera; O:\Clients\418 City of Modesto\02-14-36 Water Master Plan\GIS\Figures\Fig2-1_WatServArea.mxd

Modesto

Salida

Empire

Grayson

Turlock

Del Rio

North Ceres(Portion Served by Modesto)

132

99

Ceres (Walnut Manor)

Bret Harte

West Modesto

Shackelford

99

108

Stanislaus County

Merced County

33

Waterford

Hickman

132

99

0 2.251.125

Scale in Miles

Notes1. Pipeline diameters are based on City's current GIS provided by the City on 10/23/2014.2. Effective July 1, 2015, the City no longer provides water service to the communities of Hickman and Waterford.3. Tier 1 and 2 MID turnouts are shown.4. City limit boundary based on County GIS data downloaded on October 6, 2014.


Water Master Plan

EXISTING WATERSYSTEM FACILITIES

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T-11

T-13 LEGEND

3QModesto Regional WaterTreament Plant(MRWTP)

#* Active Well#* Out of Service Well#* Near-Term Well

UTTank and Booster PumpStation

UTNear-Term Tank andBooster Pump Station

")Well Previously Operatedby the City

!!2 MID TurnoutExisting PipelineNear-Term PipelinesContiguous Service AreaOutlying Service AreaOutlying Service Area NoLonger Served by City(see Note 2)City Limits

Last Saved: 12/29/2016 3:35:58 PM sdean; O:\Clients\418 City of Modesto\02-14-36 Water Master Plan\GIS\Figures\Fig2-2_ExSys.mxd

¬«108

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0 10.5

Sc a le in Miles

Notes1. Pip eline d ia meters a re b a sed on rec ently up d a ted hyd ra ulic mod el.2. Tier 1 a nd 2 Turnouts a re shown.3. City limit b ound a ry b a sed on County GIS d a ta d ownloa d ed on O c tob er 6, 2014.


Water Master Plan

EXISTING CONTIGUOUSSERVICE AREAWATER SYSTEM

FACILITIES

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T-13

LEGEND#* Active Well#* O ut of Servic e Well#* Nea r-Term Well

UTTa nk a nd Booster PumpSta tion

UTNea r-Term Ta nk a ndBooster Pump Sta tion

!!2 MID TurnoutPip elines > 24-inc hes12-inc hes < Pip elines ≤24-inc hesPip elines ≤ 12-inc hesContiguous Servic e AreaCity Limits

La st Sa ved : 12/29/2016 3:38:11 PM sd ea n; O :\Clients\418 City of Mod esto\02-14-36 Wa ter Ma ster Pla n\GIS\Figures\Fig2-3_ExSysContiguous.mxd

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Chapter 2 Existing System - Modesto, CA

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