Water Supply Assessment

Tentative Tract No. 72626 Project

MAY 2014

Prepared by: Stetson Engineers Inc.

861 Village Oaks Drive, Covina, California 91724 Phone: (626) 967-6202, Fax: (626) 331-7065 Covina, CA San Rafael, CA Centennial CO TABLE OF CONTENTS

Executive Summary ...... 1 1.0 Introduction ...... 1 1.1 San Gabriel County Water District ...... 2 1.2 Water Supply Planning Provisions ...... 2 1.2.1 California Water Code (Sections 10910-10915) ...... 3 1.2.2 Government Code 66473.7 ...... 3 2.0 Water Demands ...... 4 2.1 Historic Water Demand ...... 4 2.2 Projected Future Water Demand ...... 5 3.0 Water Supply Sources ...... 7 3.1 Groundwater Wells ...... 7 3.2 Main San Gabriel Basin ...... 7 3.2.1 Main San Gabriel Basin Reliability ...... 8 3.2.2 Imported Water Supplies ...... 15 3.2.2.1 SWP Water Reliability ...... 15 3.2.2.2 Colorado River Water Reliability ...... 17 3.2.2.3 Metropolitan Water District of Southern California ...... 17 3.2.2.4 San Gabriel Valley Municipal Water District ...... 20 3.3 Raymond Basin ...... 22 4.0 Future Supply ...... 24

-i- TABLE OF CONTENTS

List of Tables

Table 1. Historical Water Demands (AFY) ...... 4 Table 2. Current and Projected Water Use for SGCWD (AFY) ...... 6 Table 3. SGCWD’s Production from the Main San Gabriel Basin (AFY) ...... 8 Table 4. Historic Water Supplies in the Main San Gabriel Basin (AFY) ...... 9 Table 5. 10-Year Rolling Average of Main San Gabriel Basin Water Supplies ...... 10 Table 6. Projected Population Served by Main San Gabriel Basin Producers ...... 11 Table 7. Projected Main San Gabriel Basin Water Demands (AFY) ...... 12 Table 8. Operation of Main San Gabriel Basin (AFY) ...... 14 Table 9. Projected Total Main San Gabriel Basin Imported Water Demands (AFY) 15 Table 10. MWD’s Projected Average Year Water Supplies and Demands (AFY) ..... 19 Table 11. MWD’s Projected Single Dry Year Water Supplies and Demands (AFY) .. 19 Table 12. MWD’s Projected Multiple Dry Year Water Supplies and Demands (AFY) 20 Table 13. Replacement Water Provided by SGVMWD (AFY) ...... 21 Table 14. SGCWD’s Water Rights and Production in the Raymond Basin ...... 23 Table 15. SGCWD’s Projected Water Supplies in 2015 (AFY) ...... 25 Table 16. SGCWD’s Projected Water Supplies in 2020 (AFY) ...... 26 Table 17. SGCWD’s Projected Water Supplies in 2025 (AFY) ...... 27 Table 18. SGCWD’s Projected Water Supplies in 2030 (AFY) ...... 28 Table 19. SGCWD’s Projected Water Supplies in 2035 (AFY) ...... 29

-ii-

Water Supply Assessment San Gabriel County Water District Tentative Tract No. 72626 Project May 2014

Executive Summary

The proposed “Tentative Tract No. 72626 Project” (Project) area is located within the City of San Gabriel to which San Gabriel County Water District (SGCWD) currently provides water service. The proposed Project will result in an additional water demand during average/normal year of up to 73 acre-feet per year (AFY) by year 2035. SGCWD’s estimated water demands, assuming the service area population increases only as a result of the Project’s population/water demands, is approximately 6,552 AFY by the year 2035. SGCWD currently meets water demands by pumping groundwater from the Main San Gabriel Basin and Raymond Basin. SGCWD pumps the majority of groundwater from the Main San Gabriel Basin. Management of the Main San Gabriel Basin, including delivery of untreated imported water for groundwater replenishment, allows SGCWD, and all other producers, to meet all water demands without any limitations on groundwater pumping from the Main San Gabriel Basin. Reliability of the Main San Gabriel Basin groundwater supplies has been demonstrated during droughts with no resulting limitation of groundwater production. SGCWD’s Decreed Rights in the Raymond Basin has been reduced by 30 percent (to about 763.7 AFY in fiscal year 2013-14). SGCWD currently has an estimated reliable pumping capacity of about 560 AFY from the Raymond Basin. Consequently, the reduction in Decreed Rights will not have an effect on SGCWD meeting its water demands. Based on the demonstrated reliability of SGCWD’s water supply sources, sufficient water supplies can be reasonably concluded to be fully reliable and available to meet SGCWD’s future demands with the Project, including during single and multiple dry years.

1.0 Introduction

The approximately 5-acre Project, which includes multi-family residences for condominium proposes is proposed for a portion of SGCWD’s service area in the City of San Gabriel. The Project is located east of Gladys Avenue, north of Grand Avenue, west of the Rubio Wash, and south of Commercial Avenue (see Figures 1A and 1B). It is anticipated SGCWD will provide all water supply to the Project. Project water demands within SGCWD and the long-term water supply for SGCWD are discussed below.

-1- 1.1 San Gabriel County Water District

SGCWD is located in Los Angeles County and serves portions of the Cities of San Gabriel, Rosemead, Temple City and unincorporated portions of Los Angeles County (see Figure 1). SGCWD’s total service area is approximately 2,680 acres. There are approximately 9,000 service connections serving a population of approximately 43,000 people. SGCWD will provide water service to the proposed Project area.

1.2 Water Supply Planning Provisions

Population growth in the State of California has resulted in additional water demand on water systems. The State legislature has enacted laws to ensure the increased demands are adequately addressed and a firm source of water supply is available prior to approval of certain new developments. The regulations include California Water Code Division 6, Part 2.10, Sections 10910-10915 (Water Supply Planning to Support Existing and Planned Future Use) and Government Code 66473.7, which are briefly described below. The provisions of the California Water Code and the Government Code seek to promote more collaborative planning between local water suppliers and cities and counties and require detailed information regarding water availability to be provided to city and county land use planners prior to approval of certain specified large land use development projects.

This Water Supply Assessment was prepared pursuant to the requirements of the California Water Code and the Government Code for the approach, required information, and criteria confirming SGCWD has sufficient water supplies to meet the projected water demands of the Project, in addition to existing and other planned future uses. The Urban Water Management Plan (UWMP) is a foundational document for compliance with the California Water Code and the Government Code. The provisions of the California Water Code and the Government Code repeatedly identify the UWMP as a planning document that can be used by a water supplier to meet the standards set forth in both statutes. California Environmental Quality Act (CEQA) guidelines section 15083.5 contains similar provisions regarding consultation with water agencies for certain projects. SGCWD’s 2010 UWMP (May 2011), Metropolitan Water District of Southern California’s (MWD) 2010 Regional UWMP (November 2010), Upper San Gabriel Valley Municipal Water District’s (Upper District) 2010 UWMP (June 2011), and San Gabriel Valley Municipal Water District’s (SGVMWD) 2010 UWMP (December 2010), prepared pursuant to California Water Code Division 6, Part 2.55, Section 10608 (Sustainable Water Use and Demand Reduction) and California Water Code Division 6, Part 2.6, Sections 10608-10656 (Urban Water Management Planning), describe future water demands and future availability of the water supply sources used by SGCWD and other retail water agencies operating within the Main San Gabriel Basin and Raymond Basin. These UWMP documents were used to prepare this Water Supply Assessment.

-2- 1.2.1 California Water Code (Sections 10910-10915)

Existing law requires every urban water supplier to identify, as part of its UWMP, the existing and planned sources of water available to the supplier over a prescribed 5-year period. Existing law prohibits an urban water supplier that fails to prepare or submit its UWMP to the Department of Water Resources from receiving financial or drought assistance from the state until the plan is submitted.

California Water Code Division 6, Part 2.10, Sections 10910-10915 requires an urban water supplier to include in its UWMP a description of all water supply projects and programs that may be undertaken to meet total projected water use over the next 20 years. The California Water Code requires a city or county that determines a project is subject to the California Environmental Quality Act to identify any public water system that may supply water for proposed developments and to request those public water systems to prepare a specific water supply assessment. If the water demands for the proposed developments have been accounted for in a recently adopted urban water management plan, the water supplier may incorporate information contained in that plan to satisfy certain requirements of a water supply assessment. The California Water Code requires the assessment to include, along with other information, an identification of existing water supply entitlements, water rights, or water service contracts relevant to the identified water supply for the proposed project and the quantities of water received in prior years pursuant to those entitlements, rights, and contracts.

The California Water Code also requires the public water system, or the city or county, as applicable, to submit its plans for acquiring additional water supplies if that entity concludes that water supplies are, or will be, insufficient.

1.2.2 Government Code 66473.7

Government Code 66473.7 prohibits approval of a tentative map, or a parcel map for which a tentative map was not required, or a development agreement for a subdivision of property of more than 500 dwelling units, except as specified, including the design of the subdivision or the type of improvement, unless the legislative body of a city or county or the designated advisory agency provides written verification from the applicable public water system that a sufficient water supply is available or, in addition, a specified finding is made by the local agency that sufficient water supplies are, or will be, available prior to completion of the project. Sufficient water supply is the total water supply available during normal, single-dry, and multiple-dry years within a 20-year projection that will meet the projected demand of the proposed Project, in addition to existing and planned future uses.

-3- 2.0 Water Demands

2.1 Historic Water Demand

SGCWD’s water supply sources include groundwater rights to both the Main San Gabriel Basin and Raymond Basin (see Figure 2). Table 1 provides SGCWD’s historical water use. Over the past 20 years, SGCWD’s groundwater production has ranged from approximately 6,157 AFY to approximately 8,092 AFY, with an average production of approximately 7,230 AFY.

Table 1. Historical Water Demands (AFY)

Fiscal Year Main Basin Raymond Basin Total Demand

1993-94 7,403 0 7,403 1994-95 7,353 0 7,353 1995-96 6,994 0 6,994 1996-97 7,364 0 7,364 1997-98 7,156 0 7,156 1998-99 7,383 0 7,383 1999-00 7,484 0 7,484 2000-01 7,610 0 7,610 2001-02 7,480 0 7,480 2002-03 7,577 0 7,577 2003-04 8,092 0 8,092 2004-05 7,779 0 7,779 2005-06 7,276 0 7,276 2006-07 7,665 0 7,665 2007-08 7,672 0 7,672 2008-09 7,042 0 7,042 2009-10 6,378 0 6,378 2010-11 6,090 67 6,157 2011-12 5,720 539 6,260 2012-13 5,761 716 6,477

Average 7,230

Sources: San Gabriel County Water District 2010 Urban Water Management Plan, 2012-13 Main San Gabriel Basin Annual Report, 2012-13 Raymond Basin Management Board Annual Report

-4- 2.2 Projected Future Water Demand

The proposed Project consists of about 88 condominiums within 5 acres in the City of San Gabriel. SGCWD will provide potable water to the entire Project. The estimated water demand is based on an average consumption for a residential customer within SGCWD’s service area, which is about 748 gallons per day per meter. Consequently, the entire proposed Project will have an estimated water demand of about 73 AFY, which will be supplied from potable sources.

SGCWD’s 2010 UWMP includes current and projected future water demands for its service area over the next twenty years. The projected water demands in SGCWD’s 2010 UWMP were calculated based on: (1) urban per capita water use targets developed pursuant to Senate Bill SBX7-7 (Water Conservation Act of 2009); and (2) population projections. Urban per capita water use targets were identified in SGCWD’s 2010 UWMP. The population projections incorporated in SGCWD’s 2010 UWMP were projected using information from the Southern California Association of Governments (SCAG), an organization mandated by the federal government to research and draw up plans for transportation, growth management, hazardous waste management, and air quality. For the purposes of this Water Supply Assessment (WSA), the following was assumed:  The Project’s water demands will be in addition to existing demands.  There will be no population growth other than the additional Project population. The Project is assumed to be fully constructed by 2020. Population after 2020 will remain constant.  Urban per capita water use for 2015 through 2035 is based on actual fiscal year 2012-13 data, which is lower than the Urban per capita water use “targets” calculated in the 2010 UWMP and in compliance with SBX7-7.

Table 2 shows the projected water demands through 2035 for SGCWD’s service area including the Project’s water demands. For the purposes of this WSA, it has been assumed Project construction will begin in 2014 and end by 2020.

-5-

Table 2. Current and Projected Water Use for SGCWD (AFY)

Water Demands (AFY) Fiscal Year (Excluding Project) [1] (Including Project) [2]

2012-13 6,477 6,477 2014-15 6,479 6,494 2019-20 6,479 6,552 2024-25 6,479 6,552 2029-30 6,479 6,552 2034-35 6,479 6,552

Notes: [1] Current and projected water demands based on SGCWD's 2010 UWMP. [2] Project water demands are estimated at 0 AFY for FY 2012-13. Project water demands for FY 2014-15 is assumed the Project will begin construction August 2014 and will be completed in phases and therefore, water demands are estimated at proportional amounts. Project water demands are estimated at 73 AFY for FY 2019-20 through 2034-35.

-6- 3.0 Water Supply Sources

3.1 Groundwater Wells

SGCWD has nine wells, eight in the Main San Gabriel Basin (Wells No. 5, 8, 9, 10, 11, 12, 14, and 15) and one in the Raymond Basin (Well No. 3). Currently, Wells No. 3, 9, 11, 12, 14, and 15 are active sources of water supply. SGCWD’s wells are located at various points within the distribution system, in the Cities of San Gabriel, Rosemead, Temple City and unincorporated portions of Los Angeles in residential and commercial areas. The wells were drilled at depths ranging from 340 feet to 1,340 feet below ground surface (bgs) between years 1924 and 2012, with a maximum pumping capacity ranging from 950 gallons per minute (gpm) to 2,700 gpm. The screened intervals of the wells range from 50 feet to 1,320 feet bgs. SGCWD’s active wells pump directly into the distribution system except for Well No. 15, which pumps directly into the Longden Reservoir No. 2, and Well No. 3, which pumps directly into the Van Nuys Reservoir. The proposed Project may require SGCWD to implement system improvements, which would be funded through connection fees and Project development fees, collected by SGCWD.

3.2 Main San Gabriel Basin

The total fresh water storage capacity of the Main San Gabriel Basin is estimated to be approximately 8.7 million AF. Of that storage, about 1,000,000 AF is historically considered to have been actively managed for local public water supply. The Court adjudication of the Main San Gabriel Basin in 1973 provided groundwater management that allows operation of basin storage to meet water demands and provide a mechanism to fund the purchase and replenishment of untreated imported water to supplement recharge of local water. The management of basin storage, and the use of supplemental imported water for recharge, expand and increase the reliability of the available basin groundwater supply. A description of the elements of the adjudication that allow efficient management of the Main San Gabriel Basin is included in the attached Appendix A. Although there is no limit on the quantity of groundwater that may be extracted by parties to the Main San Gabriel Basin adjudication, including SGCWD, groundwater production in addition to a pumper’s proportional share (pumper’s share) of the Operating Safe Yield (see Appendix B), requires the pumper to bear the cost of imported replacement water to recharge the Main San Gabriel Basin. SGCWD’s pumper’s share is currently 2.73019 percent of the Operating Safe Yield.

Table 3 shows SGCWD’s historical groundwater production from the Main San Gabriel Basin. Table 3 shows that SGCWD’s production from the Main San Gabriel Basin ranged from 5,720 AFY to 8,092 AFY, with an average of approximately 7,164 AFY. The reliability of the Main San Gabriel Basin to meet all demands is discussed below in Section 3.1.1.

-7- Table 3. SGCWD’s Production from the Main San Gabriel Basin (AFY)

Fiscal Year Total Demand

1993-94 7,403 1994-95 7,353 1995-96 6,994 1996-97 7,364 1997-98 7,156 1998-99 7,383 1999-00 7,484 2000-01 7,610 2001-02 7,480 2002-03 7,577 2003-04 8,092 2004-05 7,779 2005-06 7,276 2006-07 7,665 2007-08 7,672 2008-09 7,042 2009-10 6,378 2010-11 6,090 2011-12 5,720 2012-13 5,761

Average 7,164

Source: Fiscal years 1995-96 through 2009-10 from SGCWD’s 2010 Urban Water Management Plan. Fiscal years 2010-11 through 2012-13 from Main San Gabriel Basin Annual Report for fiscal year 2012-13.

3.2.1 Main San Gabriel Basin Reliability

A majority of SGCWD’s water supply is from the Main San Gabriel Basin (additional water supply from the Raymond Basin is discussed in Section 3.3). The groundwater supply is reliable based on the 1973 Court adjudication and the resulting efficient management of total water supplies. Historical water supplies used within the Main San Gabriel Basin are shown in Table 4. This table includes groundwater extractions, surface water diversions, and direct delivery of treated imported water (from Upper San Gabriel Valley Municipal Water District and Three Valleys Municipal Water District) within the Main San Gabriel Basin. Table 5 provides rolling ten-year averages of the total water supplies. Although historical total water supplies in the Main San Gabriel Basin have generally increased as population increased, the recent rolling ten-year averages show a decrease in average total water supplies.

-8-

Table 4. Historic Water Supplies in the Main San Gabriel Basin (AFY)

Direct Deliveries (Treated Recorded Production [1] Imported Water) [2] Total Water Fiscal Year Demand [3] Surface Groundwater Total USGVMWD TVMWD Water

1993-94 227,527.16 19,303.39 246,830.55 4,421.10 10,776.90 262,028.55 1994-95 229,428.62 17,228.87 246,657.49 4,218.70 12,120.30 262,996.49 1995-96 253,160.59 18,939.81 272,100.40 3,667.10 10,113.53 285,881.03 1996-97 260,426.44 22,359.41 282,785.85 3,620.10 10,280.00 296,685.95 1997-98 239,717.72 17,714.26 257,431.98 4,011.40 6,803.50 268,128.88 1998-99 246,290.84 22,214.53 268,505.37 3,777.80 6,714.40 278,997.57 1999-00 265,183.96 17,011.48 282,195.44 7,642.80 9,910.70 299,748.94 2000-01 254,173.82 20,030.61 274,204.43 5,784.90 10,900.33 290,889.66 2001-02 250,564.07 17,203.00 267,767.07 14,907.20 16,806.40 299,480.67 2002-03 235,808.79 4,700.37 240,509.16 17,668.20 20,295.10 278,472.46 2003-04 248,571.06 7,336.89 255,907.95 24,616.20 23,083.90 303,608.05 2004-05 237,334.76 12,929.54 250,264.30 9,897.30 17,586.70 277,748.30 2005-06 249,288.93 13,466.37 262,755.30 8,165.80 12,143.60 283,064.70 2006-07 273,038.79 14,254.90 287,293.69 11,326.80 11,613.60 310,234.09 2007-08 253,249.69 7,944.34 261,194.03 13,930.70 13,216.10 288,340.83 2008-09 240,040.99 13,730.72 253,771.71 5,468.00 13,149.85 272,389.56 2009-10 225,933.43 14,524.38 240,457.81 3,945.30 9,772.60 254,175.71 2010-11 216,639.37 13,445.98 230,085.35 1,001.10 6,886.20 237,972.65 2011-12 222,533.64 17,494.33 240,027.97 975.4 6,586.60 247,589.97 2012-13 233,298.27 12,283.77 245,582.04 491.1 10,815.20 256,888.34

20 Year Average 243,110.55 15,205.85 258,316.39 7,476.85 11,978.78 277,766.12

Notes: [1] "Recorded Production" consists of groundwater extractions, surface water diversions and treated imported water from USG-5 which is counted as a groundwater extraction, but does not include imported water purchased for replacement/ recharge purposes. [2] "Direct Deliveries (Imported Water)" does not include imported water purchased for replacement/recharge purposes [3] Does not include recycled water deliveries

TVMWD = Three Valleys Municipal Water District USGVMWD = Upper San Gabriel Valley Municipal Water District

Source: Main San Gabriel Basin Watermaster Annual Report 2012-13

-9- Table 5. 10-Year Rolling Average of Main San Gabriel Basin Water Supplies 10-Year Rolling Annual Increase of 10- Fiscal Year Average Year Average

1998-99 269,605.42 0.0% 1999-00 271,218.90 0.6% 2000-01 274,106.50 1.1% 2001-02 280,046.27 2.2% 2002-03 282,331.02 0.8% 2003-04 286,488.97 1.5% 2004-05 287,964.15 0.5% 2005-06 287,682.52 -0.1% 2006-07 289,037.33 0.5% 2007-08 291,058.53 0.7% 2008-09 290,381.78 -0.2% 2009-10 285,752.12 -1.6% 2010-11 280,388.64 -1.9% 2011-12 275,125.70 -1.9% 2012-13 272,967.29 -0.8%

Source: Main San Gabriel Basin Watermaster Annual Reports

Future total water demands in the Main San Gabriel Basin can be projected based on population growth. Population projections within the Main San Gabriel Basin were based on population data provided in Upper San Gabriel Valley Municipal Water District’s 2010 UWMP, San Gabriel Valley Municipal Water District’s 2010 UWMP, and Three Valleys Municipal Water District’s 2010 UWMP. Based on the population data, the total population within the combined service areas for all Main San Gabriel Basin water producers was estimated (see Table 6). The total population served by Main San Gabriel Basin water producers is projected to increase from approximately 1,270,000 people, in 2015, to approximately 1,440,000 people, in 2035. This represents an increase of approximately 166,000 people over the next twenty years with an annual growth rate of approximately 0.6 percent.

-10- Table 6. Projected Population Served by Main San Gabriel Basin Producers

Year Population

2015 1,273,602 2020 1,316,250 2025 1,359,054 2030 1,399,597 2035 1,439,835

Sources: Population projections from Upper San Gabriel Valley Municipal Water District’s 2010 UWMP, San Gabriel Valley Municipal Water District’s 2010 UWMP, and Three Valleys Municipal Water District’s 2010 UWMP,

Total water demands in the Main San Gabriel Basin (excluding major industrial uses and exports to the Central Basin) can be compared with population information to obtain a water use per capita rate. Between fiscal years 2008-09 and 2012-13 (see Table 7), the average recorded production in the Main San Gabriel Basin was approximately 241,985 AFY; the average total export to the Central Basin was approximately 40,790 AFY; and the average total major industrial demand was approximately 5,786 AFY. Based on the net average demand in the Main San Gabriel Basin of approximately 195,409 (241,985 – 40,790 – 5,786) AFY and a 2010 population in the Main San Gabriel Basin of approximately 1,230,000 people, the average annual per capita water use rate was approximately 0.16 AFY (195,409 AFY / 1,230,000 people). For the purposes of this WSA, it is assumed the per capita water use rate of 0.16 AFY will continue over the next twenty years (from 2015 through 2035). Based on the estimated per capita water use and projected population growth, total water served by producers in the Main San Gabriel Basin will increase from approximately 250,356 AFY, in 2015, to approximately 278,946 AFY, in 2035, with an annual growth rate of approximately 0.5 percent, as shown in Table 7. For conservative purposes, reduced per capita water use targets required pursuant to Senate Bill SBX7-7 have not been incorporated in the Main San Gabriel Basin water use projections.

-11- Table 7. Projected Main San Gabriel Basin Water Demands (AFY)

Main San Gabriel Basin Demands (AFY) Demand Population from Industrial Year [1] Population Central Basin Demands [2] Exports [3] [4] Total

2008-09* -- 203,587 42,154 8,032 253,772 2009-10* -- 195,700 41,129 3,629 240,458 2010-11* -- 185,138 39,117 5,830 230,085 2011-12* -- 194,703 40,180 5,144 240,028 2012-13* -- 197,920 41,369 6,293 245,582

5-Year -- 195,410 40,790 5,786 241,985 Average

2015 1,273,602 203,780 40,790 5,786 250,356 2020 1,316,250 210,600 41,290 5,786 257,676 2025 1,359,054 217,450 41,790 5,786 265,026 2030 1,399,597 223,940 42,290 5,786 272,016 2035 1,439,835 230,370 42,790 5,786 278,946

Notes: * In fiscal year [1] See Table 6 [2] Based on an average annual water use rate was approximately 0.16 AFY per capita

[3] 2015 exports are based on average exports between fiscal years 2008-09 and 2012-13; Exports are anticipated to increase along with Project development and have been estimated to increase approximately 2,000 AF over a 20 year period

[4] Based on average industrial demands between fiscal years 2008-09 and 2012-13; assumed to remain constant

Producers in the Main San Gabriel Basin obtain water supplies from groundwater extractions, surface water diversions, and direct delivery of treated imported water. As discussed in Appendix B, producers within the Main San Gabriel Basin have a share of the Operating Safe Yield of the Main San Gabriel Basin and can produce that amount of water without paying a Replacement Water Assessment. A few producers also have surface water rights (approximately 10,500 AFY) in addition to their share of the Operating Safe Yield and can also produce those rights free of a Replacement Water Assessment. Producers that extract a groundwater and/or surface water amount greater than their allocated share are charged a Replacement Water Assessment, which is used to purchase imported water for replacement/recharge into the Main San Gabriel Basin. Imported water for replacement/recharge purposes is purchased from one of three municipal water districts overlying or partially overlying the Main San Gabriel Basin that provide imported water for groundwater replacement/recharge or for direct use (see Appendix B). The three municipal water districts are Upper District, SGVMWD and Three Valleys Municipal Water District (TVMWD). SGCWD is located within Upper District’s service area. The management of the Main San Gabriel Basin and the large volume of groundwater in storage allow groundwater producers, including

-12- SGCWD, to produce groundwater even when imported replacement water is not available. Any requirement to purchase imported water for replacement/recharge purposes can be met when such water is available in the future. Also discussed in Appendix B is the cyclic storage provision allowing producers like SGCWD to store supplemental water within the Main San Gabriel Basin for the purpose of supplying a future replacement water requirement. For example, SGCWD and other producers have added a total of approximately 76,700 AF in cyclic storage accounts over the last three (3) years illustrating the effectiveness of this water resource program in meeting the replacement water requirements of water producers.

The replacement water requirement in the Main San Gabriel Basin is determined by the Operating Safe Yield and Main San Gabriel Basin production. As shown in Table 5, the recent rolling ten-year averages show a decrease in average total water demands. As shown in Table 8, over the past five (5) years (fiscal years 2008-09 through 2012-13), the average water production from the Main San Gabriel Basin has been approximately 241,985 AFY, and the average replacement water requirement has been approximately 45,000 AFY.

Based on the projected water demands (see Table 7) and the recent historical average water production of 241,985 AFY (during fiscal years 2008-09 through 2012-13) in the Main San Gabriel Basin, the additional replacement water requirement can be projected for future years, assuming other sources of water supply remain at historic levels. Other sources of water supply historically used in the San Gabriel Valley include direct delivery of approximately 11,820 AFY of treated MWD imported water (discussed below). The projected water demands (less direct delivery) can be compared with the recent historical average water production (241,985 AFY) to determine the additional replacement water requirement. The total projected replacement water requirement is the sum of the recent historical average replacement water requirement (45,000 AFY) and the additional replacement water requirement.

-13-

Table 8. Operation of Main San Gabriel Basin (AFY)

Replacement Water Total Requirements and Fiscal Direct Production Cyclic Storage Year Deliveries [1] Deductions [2]

2008-09 253,772 18,618 56,712 2009-10 240,458 13,718 50,059 2010-11 230,085 7,887 48,467 2011-12 240,028 7,562 40,389 2012-13 245,582 11,306 29,645

5-Year 241,985 11,818 45,055 Average

Notes:

[1] See Table 4 [2] Includes Replacement Water Requirements and deductions from Producer Cyclic Storage

For the purpose of this WSA, the adopted 2014-15 Operating Safe Yield of 150,000 AFY (which was influenced by the decreasing water levels in the Main San Gabriel Basin) was used to identify potential future replacement water requirements. The estimated replacement water requirement in 2015, assuming an Operating Safe Yield of approximately 150,000 AFY, and based on average water production (during fiscal years 2008-09 through 2012-13), is approximately 52,000 AFY. The large storage capacity of the Main San Gabriel Basin provides the flexibility for replacement water deliveries to be made when supplemental water is available to MWD and SGVMWD for groundwater recharge.

In addition to untreated supplemental replacement/recharge deliveries, treated imported water is available to Main San Gabriel Basin water producers as a direct delivery (see Table 4). Over the past five years, total direct deliveries of treated imported water have ranged from approximately 7,600 AFY to 18,600 AFY, with an average of approximately 11,820 AFY. Demands for direct delivery water in the Main San Gabriel Basin previously increased (approximately 47,700 AF in 2003-04) due to groundwater contamination. However, these demands have declined with the completion of large- scale groundwater treatment facilities in 2005 and 2006. In addition, based on Upper District’s 2010 UWMP, direct deliveries of treated imported water are projected to decrease in the future within its service area.

Based on the average total direct delivery of treated imported water of approximately 11,820 AFY and the estimated 2014-15 replacement water requirement of approximately 52,100 AFY, the total current imported water demand is approximately

-14- 63,920 (11,820 + 52,100) AFY. Table 9 projects the total future imported water requirement (including replacement/recharge and a decreasing direct delivery) for producers in the Main San Gabriel Basin, without assuming increases from other sources of water supply such as recycled water. Table 9 shows that total imported water requirements could increase from approximately 63,920 AFY, in 2015, to approximately 92,500 AFY, in 2035. Since other sources of water supply, including groundwater imported from the Raymond Basin and groundwater recharge of local rainfall runoff, have been assumed to remain at historical levels, it is assumed the increasing Main San Gabriel Basin water demands listed in Table 9 will be met by increases in imported water. Increased water demands can also be met through increased use of recycled water in the Main San Gabriel Basin, including recycled water supplies discussed in Section 4.0. Recycled water supplies are not incorporated in determining the future imported water requirements shown in Table 9. Increases in imported water demands in Table 9 will be a combination of increased replacement water deliveries and a constant level of direct delivery of imported water. The reliability of imported water supplies is discussed further in Section 3.1.2.

Table 9. Projected Total Main San Gabriel Basin Imported Water Demands (AFY)

Year 2015 2020 2025 2030 2035

Total Imported Water 63,920 71,238 78,588 85,578 92,508

3.2.2 Imported Water Supplies

As discussed previously, Main San Gabriel Basin water producers can purchase untreated imported water from SGVMWD (from the California State Water Project (SWP)) and untreated imported water supplies from MWD (including Colorado River water, SWP water, water storage, and water transfers) through Upper District and TVMWD. Further discussions of imported water supplies from MWD and SGVMWD are provided in Sections 3.1.2.1 and 3.1.2.2.

3.2.2.1 SWP Water Reliability

MWD and SGVMWD contract with the State of California, through the SWP, for the delivery of northern California water through the California Aqueduct. The SWP is a water storage and delivery system maintained and operated by the California Department of Water Resources (DWR). The SWP is a statewide water conveyance system that diverts and stores water in Northern and Central California and conveys water (including through the Sacramento-San Joaquin Delta region) to 29 water agencies throughout the State. The SWP has delivered water since the 1960’s through

-15- a network of aqueducts, pumping stations and powerplants. In order for the SWP to increase deliveries to the maximum amount of contractual commitments to water, the SWP must expand its water conveyance facilities to divert greater flows from north of the Bay-Delta area into the California Aqueduct.

The San Francisco Bay -Sacramento River Delta area (Bay-Delta) is a part of the SWP water delivery system. The reliability of the Bay-Delta to deliver water may be impacted by potential risks associated with endangered species, earthquakes, levee failure, and climate change. In order to mitigate these potential risks, State and federal resources and environmental protection agencies and a broad range of stakeholders are involved in a multiyear planning process referred to as the CALFED process to develop programs to greatly improve the capacity and reliability of the SWP and the environmental conditions of the Bay-Delta. The Bay-Delta cooperating agencies approved a Record of Decision in August 2000 for a Programmatic Environmental Impact Report/Impact Statement for a multi-year improvement program. The improvement program includes projects related to DWR’s SWP conveyance capacity, water quality, and operation of the SWP. Those programs are undergoing thorough environmental review and public input is required.

The Bay Delta Conservation Plan (BDCP) grew out of the CALFED Bay-Delta Plan’s Ecosystem Restoration Program Conservation Strategy. A draft BDCP was prepared through a collaboration of state, federal, and local water agencies, state and federal fish agencies, and a broad range of stakeholders. The BDCP identifies conservation strategies, water flow, and habitat restoration actions in California’s Sacramento-San Joaquin Delta. The goal of the BDCP is to provide for both species/habitat protection and improved reliability of water supplies. The administrative draft BDCP documents are available. The Public Draft BDCP and Public Draft Environmental Impact Report / Environmental Impact Statement was released for formal public review and comment in December 2013. The comment period began on December 13, 2013 and is expected to conclude on June 13, 2014. The BDCP is intended to meet the standards of the Sacramento-San Joaquin Delta Reform Act of 2009, described below.

In November 2009, following more than three (3) years of BDCP planning, the State of California enacted comprehensive legislation, including the Sacramento-San Joaquin Delta Reform Act of 2009 (California Water Code Division 35) which provided for an independent state agency, the Delta Stewardship Council. Pursuant to that act, the Delta Stewardship Council developed a comprehensive management plan that provides more reliable water supply for California and protects and enhances the Delta ecosystem (through development and implementation of a Delta Plan). The Delta Stewardship Council adopted a final Delta Plan in May 2013 which is the comprehensive long-term management plan for the Delta to improve statewide water supply reliability and to protect the Delta. The Delta Stewardship Council also adopted a Programmatic Environmental impact Report (PEIR) on the Delta Plan in May 2013. The PEIR evaluates the potential impact of the Delta Plan and identifies mitigation measures. The Delta Stewardship Council is currently facing lawsuits challenging the certification of an EIR for the Delta Plan. However, the impact of the outcome of these lawsuits cannot be reasonably determined at this time.

-16- DWR’s “State Water Project Final Delivery Reliability Report 2011” (2011 Report), dated June 2012, indicates the delivery reliability of SWP water is approximately 60 percent, on average, over the next 20 years. The DWR report incorporated future impacts on water deliveries as a result of climate change and potential limited pumping of the SWP to protect salmon, smelt, and other species in the Sacramento-San Joaquin Delta and Central Valley areas, including operational restrictions of the biological opinions issued by the U.S. Fish and Wildlife Service (USFWS) in December 2008 and the National Marine Fisheries Service (NMFS) in June 2009 governing the SWP and Central Valley Project (a Federal water storage and conveyance facility) operations. Subsequently, a U.S. District Court Judge remanded the biological opinions to the USFWS and NMFS for further review and analysis. The long term impact of these issues cannot be fully quantified at this time. DWR plans to develop additional water supply facilities in order for the SWP to deliver contracted water beyond historical delivery quantities.

3.2.2.2 Colorado River Water Reliability

In addition to obtaining water from the SWP, MWD obtains water from the Colorado River. MWD owns and operates the Colorado River Aqueduct which conveys water from Lake Havasu on the Colorado River to water transmission pipelines and to Lake Matthews for storage. MWD’s Colorado River water right includes a fourth and fifth priority under the 1931 Seven Party Agreement relating to California's share in the Colorado River water supply. In 1964 a United States Supreme Court decree (Arizona v. California) limited California to 4.4 million AF per year from the Colorado River plus any available surplus water. An amount of 550,000 AF was allotted to California under the fourth priority right and an amount of 662,000 AF was allotted to California under the fifth priority right. MWD can receive water under the fifth priority right when the United States Secretary of the Interior determines that there is a surplus of water or if Arizona or Nevada does not use all of their allocated water. Through farm and irrigation conservation programs, improved reservoir system operations, land management programs, and water transfer and exchanges, MWD has increased the reliable supply from the Colorado River Aqueduct. According to MWD’s “The Regional Urban Water Management Plan” (RUWMP), dated November 2010, the supply capability of the Colorado River Aqueduct through the year 2035 is at least 1,250,000 AFY during average, single dry, and multiple dry year conditions. A further discussion of MWD’s additional water supplies is provided below.

3.2.2.3 Metropolitan Water District of Southern California

MWD provides approximately 95 percent of imported water supplies to the Main San Gabriel Basin for both replacement/recharge purposes and direct delivery. As discussed in Appendix B, imported water from MWD is provided through Upper District and TVMWD, which are both entitled to deliver and sell water from MWD. Untreated imported water can be spread and stored in the Main San Gabriel Basin for replacement/recharge. Treated imported water can be delivered directly to retail water utilities in the Main San Gabriel Basin with available connections.

-17- MWD’s RUWMP provides information regarding MWD’s water supply reliability and the ability to meet all projected water demands. MWD has indicated in its report that, with the addition of all water supplies existing and planned, MWD would have the ability to meet all of its member agencies’ projected supplemental demand for the next twenty years, even during a repeat of the worst drought scenario.

MWD’s 2010 RUWMP considers DWR’s “State Water Project Delivery Reliability Report 2009” (2009 Report), dated August 2010, which contains similar deliveries during future conditions as the 2011 Report. MWD’s 2010 RUWMP concludes that MWD will have sufficient water available for anticipated water demands in its service area, including the San Gabriel Valley area, through the year 2035. In addition, since the San Gabriel Valley primarily requires replacement water from MWD and delivery of replacement water can be shifted from dry years to wet years of water surplus, the available information shows adequate replacement water will be available through the year 2035.

Because of critically dry conditions in 2007 affecting MWD’s main water supply sources and Federal Court rulings protecting the Delta Smelt and other aquatic species in the Sacramento-San Joaquin River Delta, SWP water deliveries were reduced. As a result, MWD adopted a Water Supply Allocation Plan (WSAP), in February 2008 to allocate available water supplies to its member agencies. The WSAP establishes ten different shortage levels and a corresponding Allocation to each member agency. Although member agency water use is not restricted to the Allocation, additional charges would be assessed on water used above the total annual Allocation. The WSAP provides a reduced Allocation to a member agency for its Municipal and Industrial (M&I) retail demand. The WSAP considers historical local water production, full service treated water deliveries, agricultural deliveries and water conservation efforts when calculating each member agency’s Allocation.

In general, the WSAP process calculates total historical member agency demand. That historical demand is then compared to member agency projected local supply for a specific Allocation year. The balance required from MWD, less an Allocation reduction factor, is the member agency’s “Water Supply Allocation”. When an MWD Member Agency (such as Upper District and TVMWD) reduces its local demand through conservation or other means, the Allocation increases. The increased Allocation can be used for Full Service replenishment deliveries when an Allocation is in place.

In addition, MWD prepared a 2010 Update of its Integrated Resources Plan to evaluate water supply availability considering the recent developments discussed elsewhere in this Water Supply Assessment and provide a water resource strategy to meet future demands including anticipated groundwater replenishment demands.

According to MWD’s 2011 Annual Report, due to improved regional water supply conditions and lower-than-expected demand trends, no WSAP Allocations were declared for fiscal year 2011-12 and full imported water deliveries were restored. In addition, MWD did not declare any WSAP Allocations for fiscal year 2012-13. According to the Upper District’s 2010 UWMP, Upper District’s WSAP Allocation during fiscal-year 2009-10 was approximately 31,400 acre-feet. Although WSAP Allocations can be used to purchase imported water for replacement/recharge purposes, any

-18- requirement to purchase imported water for replacement/recharge purposes can be met when such water is available, including years when WSAP Allocations are not in effect.

Tables 10, 11, and 12 show MWD’s projected total water supplies and demands through year 2035 for average, single dry, and multiple dry years, respectively. MWD has sufficient water supplies to meet all of its member agencies projected supplemental demand for the next twenty years, even during multiple dry years. MWD’s greatest water demands, which occur during a multiple dry year, will increase at a rate of approximately 0.2 percent per year from approximately 2,236,000 AFY, in 2015, to 2,399,000 AFY, in 2035.

Table 10. MWD’s Projected Average Year Water Supplies and Demands (AFY) 2015 2020 2025 2030 2035

Supplies (Current Programs) 3,485,000 3,810,000 4,089,000 3,947,000 3,814,000

Demands 2,006,000 1,933,000 1,985,000 2,049,000 2,106,000

Surplus 1,479,000 1,877,000 2,104,000 1,898,000 1,708,000

Supplies (Proposed Programs) 588,000 689,000 1,051,000 1,051,000 1,051,000

Potential Surplus 2,067,000 2,566,000 3,155,000 2,949,000 2,759,000

Source: MWD's Regional UWMP, November 2010, Table 2-11

Table 11. MWD’s Projected Single Dry Year Water Supplies and Demands (AFY) 2015 2020 2025 2030 2035

Supplies (Current Programs) 2,457,000 2,782,000 2,977,000 2,823,000 2,690,000

Demands 2,171,000 2,162,000 2,201,000 2,254,000 2,319,000

Surplus 286,000 620,000 776,000 569,000 371,000

Supplies (Proposed Programs) 762,000 862,000 1,036,000 1,036,000 1,036,000

Potential Surplus 1,048,000 1,482,000 1,812,000 1,605,000 1,407,000

Source: MWD's Regional UWMP, November 2010, Table 2-9

-19- Table 12. MWD’s Projected Multiple Dry Year Water Supplies and Demands (AFY) 2015 2020 2025 2030 2035

Supplies (Current Programs) 2,248,000 2,417,000 2,520,000 2,459,000 2,415,000

Demands 2,236,000 2,188,000 2,283,000 2,339,000 2,399,000

Surplus 12,000 229,000 237,000 120,000 16,000

Supplies (Proposed Programs) 404,000 553,000 733,000 755,000 755,000

Potential Surplus 416,000 782,000 970,000 875,000 771,000

Source: MWD's Regional UWMP, November 2010, Table 2-10

3.2.2.4 San Gabriel Valley Municipal Water District

SGVMWD provides untreated imported SWP water supplies for replacement/recharge purposes to three (3) Main San Gabriel Basin producers (the Cities of Azusa, Alhambra, and Monterey Park). SGVMWD holds a long-term contract with the DWR for SWP water. SGVMWD currently has a contractual ‘Table A’ amount of 28,800 AFY of SWP water (‘Table A’ represents the proportion of available SWP water allocated and delivered to each SWP contractor. DWR determines the total amount of Table A water to be delivered on an annual basis). According to Table 13, SGVMWD has provided an average of approximately 12,094 AFY of imported SWP water, between fiscal years 2003-04 to 2012-13, to the Main San Gabriel Basin for replenishment purposes (which includes transfer of imported water that had been delivered into SGVMWD’s cyclic storage account for future replenishment demands and deductions from producer cyclic storage). Future increases in water demand for the Cities of Azusa, Alhambra, and Monterey Park will be met by increased groundwater pumping which will result in increased replacement water demands. The increased replacement water demands for the Cities of Azusa, Alhambra, and Monterey Park will be supplied to the Main San Gabriel Basin by SGVMWD. Based on current and projected population information provided in SGVMWD’s 2010 UWMP, and the 0.16 AFY per capita rate, mentioned in Section 3.1.1, the projected replacement water requirement for the Cities of Azusa, Alhambra, and Monterey Park will increase by approximately 5,300 AF from 2010 to 2035. This projected increase results in a total projected replacement water requirement from SGVMWD in 2035 of approximately 18,252 AFY. This value is approximately 63 percent of SGVMWD’s full ‘Table A’ amount of 28,800 AFY.

-20-

Table 13. Replacement Water Provided by SGVMWD (AFY)

Replacement Water Fiscal Year [1]

1993-94 5,691.49 1994-95 8,484.59 1995-96 14,525.94 1996-97 14,061.60 1997-98 10,490.25 1998-99 12,145.67 1999-00 14,128.14 2000-01 13,754.19 2001-02 10,388.49 2002-03 6,621.35 2003-04 9,370.89 2004-05 9,904.94 2005-06 4,007.79 2006-07 3,762.19 2007-08 6,191.69 2008-09 21,413.19 2009-10 25,955.86 2010-11 22,426.22 2011-12 23,769.22 2012-13 4,783.22

20 Year Average 12,093.85

Note: [1] Includes deductions from Producer Cyclic Storage Source: Main San Gabriel Basin Watermaster Annual Report, 2012-13

As discussed previously, DWR’s 2011 Report indicates the delivery reliability of SWP water is approximately 60 percent, on average, over the next 20 years. Any requirement to purchase imported water for replacement/recharge purposes in the Main San Gabriel Basin can be met when such water is available. Additional SWP ‘Article 21’ water (or water that SWP contractors may receive on a short-term basis, when available during wet months, in addition to their Table A water) may also be available during wet hydrologic periods on the SWP watershed. The large underground storage available in the Main San Gabriel Basin will allow storage of surplus water, when available, to be used during years when SWP water is less available. SGVMWD has historically used the cyclic storage provisions of the Main San Gabriel Basin Judgment (mentioned in Appendix B) to store supplemental water for future withdrawals, thereby reducing dependence on SWP water in any given year and increasing overall reliability. This conjunctive use of SGVMWD’s SWP supply and Main San Gabriel Basin groundwater storage space provides a reliable replacement water supply. It is expected that such conjunctive use practices will also continue to ensure adequate replacement water

-21- supplies through 2035, especially given that the total amount of increase in SWP water demand by the Cities of Azusa, Alhambra, and Monterey Park will only be 5,300 AF between 2010 and 2035. Furthermore, SGVMWD has the ability to use all SWP water available to it for replenishment. Given the periodic nature of water supplies in California, SGVMWD’s facilities and the Main San Gabriel Basin storage capacity will ensure that water budgets are balanced over the long term. SGVMWD has the ability to maximize replenishment of available water including surplus water during years when surplus water is available.

3.3 Raymond Basin

The Raymond Basin is a groundwater basin of approximately 40 square miles that extends from La Canada and the San Rafael hills to the west, the San Gabriel Mountain foothills to the north, the Santa Anita Canyon to the east, and the Raymond fault to the south (see Figure 2). The groundwater basin is recharged by the Arroyo Seco, a tributary to the Los Angeles River, and by Eaton Canyon, Santa Anita Canyon, and other streams in the San Gabriel River watershed. Pumping rights to the Raymond Basin are adjudicated and are managed by the Raymond Basin Management Board (RBMB). Sixteen parties have rights to pump from the Raymond Basin, which is separated into three major subareas: the Monk Hill Subarea, the Pasadena Subarea, and the Santa Anita Subarea.

The Raymond Basin Judgment adjudicated groundwater rights based on a long-term average yield of the Raymond Basin. The Judgment of the Trial Court of 1955 (Decreed Right of 1955) provides SGCWD with a Decreed Right of 1,091.0 AFY from the Pasadena Subarea (see Appendix C). The Judgment allows a party to exceed its Decreed Right by no more than 10 percent, which will be deducted from the following year’s total allowable extraction. Conversely, a party is not allowed to carryover more than 10 percent of its Decreed Right to a subsequent year.

In January 2008, the RBMB adopted a resolution which puts in place a self-imposed pumping reduction of 30 percent implemented over five years in the Pasadena Subarea. The goals of this resolution is to 1) reduce the total 1955 Decreed Rights from 17,843 AFY to 12,943 AFY in the Pasadena Subarea, 2) terminate the remaining Long-term Storage accounts in the Pasadena Subarea and 3) increase groundwater levels. In order to meet these goals, water production reductions were implemented incrementally at a rate of 1,070 AFY for five years until a 30 percent reduction is achieved. Implementation of this resolution began July 1, 2009 and has reached 30 percent in fiscal year 2013-14. As previously discussed, SGCWD’s Decreed Right is 1,091.0 AFY. The current reduction in fiscal year 2013-14 is 30 percent in the Pasadena Subarea, making SGCWD’s Decreed Rights 763.7 AFY. Table 14 provides annual Decreed Right including reductions during fiscal years 2009-10 through 2012-13, carryover, lease, and allowable groundwater extraction data for SGCWD.

-22- Table 14. SGCWD’s Water Rights and Production in the Raymond Basin Decreed Long Term Allowable Decreed Amount Season Right Leases Storage Groundwater Right Extracted Carryover Activity [1] Extraction

1993-94 1,091.0 109.1 -110.0 -981.0 109.1 0.0 1994-95 1,091.0 109.1 -975.0 -116.0 109.1 0.0 1995-96 1,091.0 109.1 -4,440.0 3,250.1 10.2 0.0 1996-97 1,091.0 10.2 -1,091.0 0.0 10.2 0.0 1997-98 1,091.0 10.2 -1,100.0 0.0 1.2 0.0 1998-99 1,091.0 1.2 -1,092.0 0.0 0.2 0.0 1999-00 1,091.0 0.2 -1,092.0 0.0 -0.8 0.0 2000-01 1,091.0 -0.8 -1,090.0 0.0 0.2 0.0 2001-02 1,091.0 0.2 -1,091.0 0.0 0.2 0.0 2002-03 1,091.0 0.2 0.0 -1,091.2 0.0 0.0 2003-04 1,091.0 0.0 -400.0 -691.0 0.0 0.0 2004-05 1,091.0 0.0 -750.0 -231.9 109.1 0.0 2005-06 1,091.0 109.1 0.0 -1,091.0 109.1 0.0 2006-07 1,091.0 109.1 -1,000.0 -91.0 109.1 0.0 2007-08 1,091.0 109.1 0.0 -204.3 995.8 0.0 2009-10 1,025.5 109.1 -50.0 -33.0 1,051.6 0.0 2010-11 960.1 109.1 0.0 -33.0 1,036.2 67.3 2011-12 894.6 109.1 0.0 -33.0 970.7 539.4 2012-13 829.2 109.1 -105.0 -8.2 825.1 716.0

Average 286.6 69.6

Note: [1] A negative value refers to storage being added to the Pasadena Subarea Source: Raymond Basin Management Board Reports, 1993 to 2003

In addition to its Decreed Right, SGCWD has a long-term storage account to store water within the Pasadena Subarea. The storage account, created by the Raymond Basin Management Board, minimizes the annual loss of Decreed water rights due to non-pumping. For example, if at the end of the operating year SGCWD has water rights in excess of the limit of 10 percent, the excess may be placed into the storage account. Water stored in this account is subject to a 1 percent annual loss. SGCWD’s maximum allowable storage in its Pasadena subarea account is 3,300 AF. SGCWD had 3,275.2 AF in its storage account as of June 30, 2013.

Over the past sixteen years, SGCWD has not extracted water from the Raymond Basin due to water quality concerns (Nitrate and Volatile Organic Compound contamination). SGCWD typically leases its entire unused Decreed water rights to other Raymond Basin water purveyors on an annual basis. Occasionally, SGCWD will store its unused water rights into its long-term storage account in the Pasadena Subarea. Beginning in fiscal year 2010-11, SGCWD began pumping from the Raymond Basin once the groundwater quality at its Well No. 3 was within the California Department of Public Health standards. During fiscal year 2012-13, production from the Raymond Basin was 716 AF and its reduced Decreed Right was 829.2 AF.

-23- 4.0 Future Supply

SGCWD’s main sources of water supply is groundwater from the Main San Gabriel Basin and the Raymond Basin. Tables 15 through 19 show SGCWD’s projected water demands and sources of water supply, under future average, single dry, and multiple dry year scenarios, from 2015 to 2035. SGCWD has historically met all of its water demands with groundwater production. Even with SGCWD’s historically reliable groundwater supply, SGCWD included a Water Shortage Contingency Plan in its 2010 UWMP identifying actions to be taken to respond to a catastrophic interruption of water supply (see Appendix D). If water supplies are temporarily insufficient to meet customer demand, SGCWD may implement its Water Shortage Contingency Plan.

SGCWD Well No. 3 pumps in the Raymond Basin with a pumping capacity of 460 gpm. Assuming a 75 percent well operating factor, the reliable pumping capacity of Well No. 3 is about 560 AFY. As previously discussed, the reduced Decreed Rights in the Raymond Basin is 763.7 AFY. Consequently, SGCWD can rely on production from the Raymond Basin as a source of water supply.

Any remaining future water demands can be supplied by groundwater from the Main San Gabriel Basin. SGCWD can rely on increased production from the Main San Gabriel Basin in accordance with the Main San Gabriel Basin Judgment (see Appendix B), even during periods of drought. As described in Appendix B, groundwater pumping limitations have never been applied to groundwater producers with rights in the Main San Gabriel Basin. As previously discussed in Section 3.1.1, SGCWD has sufficient total groundwater production capacity in the Main San Gabriel Basin to produce current and projected future water demands.

Table 15 shows the combined pumping from the Raymond Basin and Main San Gabriel Basin will provide sufficient water supply for SGCWD under all conditions in 2015. Tables 16 through 19 show that the combined pumping capacities from both the Raymond Basin and the Main San Gabriel Basin will provide sufficient water supply for SGCWD under all conditions from 2020 to 2035. Combined pumping capacities from both the Raymond Basin and the Main San Gabriel Basin will provide sufficient water supply to meet Project water demands under all conditions from 2020 to 2035.

-24- Table 15. SGCWD’s Projected Water Supplies in 2015 (AFY) Average/Normal Single Dry Multiple Dry Water Years Water Year Water Year Year 1 Year 2 Year 3

Demand (With Project) Demand (Without Project) [1] 6,479 6,300 6,300 6,500 6,272 Project Demand (Potable) [2] 15 16 16 16 14.5

Total Demand (With Project) 6,494 6,316 6,316 6,516 6,286

Supply Raymond Basin Supply [3] 560 560 560 560 560 Main San Gabriel Basin Supply [4] 5,934 5,756 5,756 5,956 5,726

Surplus/Deficiency 0 0 0 0 0

Notes:

[1] Water demands based on demands provided in SGCWD's 2010 UWMP. [2] It is assumed Project construction will begin in 2014. Project water demands for FY 2014-15 assumes the Project will begin construction August 2014 and will be completed in phases and therefore, water demands are estimated at proportional amounts. Single and multiple dry year demand and Project demand are based on the proportions of average water demand to single dry year and multiple dry year water demands, identified in SGCWD's 2010 UWMP [3] Based on current total pumping capacities of SGCWD's RB groundwater well (75% well operating factor). SGCWD's Decreed right with 30% reduction is 763.7 AFY. [4] SGCWD can pump the remaining demand from Main Basin wells. The reliable current total pumping capacities of SGCWD's MSGB groundwater wells is estimated to be about 11,300 AFY (75% well operating factor).

-25- Table 16. SGCWD’s Projected Water Supplies in 2020 (AFY) Average/Normal Single Dry Multiple Dry Water Years Water Year Water Year Year 1 Year 2 Year 3

Demand (With Project) Demand (Without Project) [1] 6,479 6,300 6,300 6,500 6,272 Project Demand (Potable) [2] 73 77 77 77 71

Total Demand (With Project) 6,552 6,377 6,377 6,577 6,343

Supply Raymond Basin Supply [3] 560 560 560 560 560 Main San Gabriel Basin Supply [4] 5,992 5,817 5,817 6,017 5,783

Surplus/Deficiency 0 0 0 0 0

Notes:

[1] Water demands based on demands provided in SGCWD's 2010 UWMP. [2] It is assumed Project construction will begin in 2014. The average year potable Project demand is estimated at 73 AFY. Single and multiple dry year demand and Project demand are based on the proportions of average water demand to single dry year and multiple dry year water demands, identified in SGCWD's 2010 UWMP [3] Based on current total pumping capacities of SGCWD's RB groundwater well (75% well operating factor). SGCWD's Decreed right with 30% reduction is 763.7 AFY. [4] SGCWD can pump the remaining demand from Main Basin wells. The reliable current total pumping capacities of SGCWD's MSGB groundwater wells is estimated to be about 11,300 AFY (75% well operating factor)

-26- Table 17. SGCWD’s Projected Water Supplies in 2025 (AFY) Average/Normal Single Dry Multiple Dry Water Years Water Year Water Year Year 1 Year 2 Year 3

Demand (With Project) Demand (Without Project) [1] 6,479 6,300 6,300 6,500 6,272 Project Demand (Potable) [2] 73 77 77 77 71

Total Demand (With Project) 6,552 6,377 6,377 6,577 6,343

Supply Raymond Basin Supply [3] 560 560 560 560 560 Main San Gabriel Basin Supply [4] 5,992 5,817 5,817 6,017 5,783

Surplus/Deficiency 0 0 0 0 0

Notes:

-27- Table 18. SGCWD’s Projected Water Supplies in 2030 (AFY) Average/Normal Single Dry Multiple Dry Water Years Water Year Water Year Year 1 Year 2 Year 3

Demand (With Project) Demand (Without Project) [1] 6,479 6,300 6,300 6,500 6,272 Project Demand (Potable) [2] 73 77 77 77 71

Total Demand (With Project) 6,552 6,377 6,377 6,577 6,343

Supply Raymond Basin Supply [3] 560 560 560 560 560 Main San Gabriel Basin Supply [4] 5,992 5,817 5,817 6,017 5,783

Surplus/Deficiency 0 0 0 0 0

Notes:

-28- Table 19. SGCWD’s Projected Water Supplies in 2035 (AFY) Average/Normal Single Dry Multiple Dry Water Years Water Year Water Year Year 1 Year 2 Year 3

Demand (With Project) Demand (Without Project) [1] 6,479 6,300 6,300 6,500 6,272 Project Demand (Potable) [2] 73 77 77 77 71

Total Demand (With Project) 6,552 6,377 6,377 6,577 6,343

Supply Raymond Basin Supply [3] 560 560 560 560 560 Main San Gabriel Basin Supply [4] 5,992 5,817 5,817 6,017 5,783

Surplus/Deficiency 0 0 0 0 0

Notes:

In addition to SGCWD’s allowable pumping allocation in the Raymond Basin and groundwater extraction from the Main San Gabriel Basin, SGCWD has the ability to obtain supplemental water supplies from the following sources: - Under the Main San Gabriel Basin, cyclic storage provisions allow producers, including SGCWD, to store supplemental water within the Main San Gabriel Basin for the purpose of supplying replacement water. - The Raymond Basin Judgment allows a party to exceed its Decreed Right by no more than 10 percent, which will be deducted from the following year’s total allowable extraction. Conversely, a party is not allowed to carryover more than 10 percent of its Decreed Right to a subsequent year. - Under the Raymond Basin, SGCWD has a long-term storage account to store water within the Pasadena Subarea. SGCWD’s maximum allowable storage in its Pasadena Subarea account is 3,300 AF.

As presented in Section 3 and Appendix B, active and effective groundwater management enables water producers in the Main San Gabriel Basin to historically meet water demands, including during single and multiple dry years. Based on the demonstrated reliability of water resources available to SGCWD, including SGCWD’s access to the Main San Gabriel Basin water supplies including imported replacement water and SGCWD’s access to Raymond Basin groundwater, SGCWD has sufficient and reliable water supplies to meet its future demands with the Project from 2015 to 2035, including during single and multiple dry years. Z:\Jobs\2099\02\Text\SGCWD_WSA.doc

-29- FIGURE 1A

ROBERT S. BRUMMETT RESERVOIR

WELL 3

VAN NUYS ZONE

WELL 15 LONGDEN RESERVOIRS 2 & 3

WELL 9

TENTATIVE TRACT NO. 72626

WELL 11

WELL 12

LONGDEN ZONE

WELL 14

861 VILLAGE OAKS DRIVE, SUITE 100 COVINA, CALIFORNIA 91791 SAN GABRIEL COUNTY WATER DISTRICT TEL: (626) 967-6202 FAX: (626) 331-7065

2171 E Francisco Blvd., Suite K SERVICE AREA BOUNDARY San Rafael California 94901 APPROXIMATE SCALE: TENTATIVE TRACT NO. 72626 2651 W Guadalupe Rd., Suite A209 1,500' 0 1,500' Mesa Arizona 85202 LOCATION MAP FIGURE 1B

WELL 9

TENTATIVE TRACT NO. 72626

WELL 11

WELL 12

861 VILLAGE OAKS DRIVE, SUITE 100 COVINA, CALIFORNIA 91791 SAN GABRIEL COUNTY WATER DISTRICT TEL: (626) 967-6202 FAX: (626) 331-7065

2171 E Francisco Blvd., Suite K SERVICE AREA BOUNDARY San Rafael California 94901 APPROXIMATE SCALE: TENTATIVE TRACT NO. 72626 2651 W Guadalupe Rd., Suite A209 500' 0 500' Mesa Arizona 85202 LOCATION MAP 861 VILLAGE OAKS DRIVE, SUITE 100 2651 W Guadalupe Rd., Suite A209 Mesa Arizona 85202 San Rafael California 94901 2171 E Francisco Blvd., Suite K FAX: (626) 331-7065 COVINA, CALIFORNIA 91724 TEL: (626) 967-6202 5,500' APPROXIMATE SCALE: TENTATIVE TRACT 0 5,500' NO. 72626 RAYMOND BASIN

ALHAMBRA WASH WASH

RUBIO WASH

RIO DISTRICT SERVICE COUNTY WATER SAN GABRIEL AREA BOUNDARY

EATON

HONDO MAIN SAN GABRIEL BASIN CHANNEL WASH ARCADIA

SAN

WASH SANTA SAN ANITA

GABRIEL JOSE

RIVER

SAWPIT CREEK WASH

WALNUT MAIN SAN GABRIEL AND RAYMOND BASINS SAN GABRIEL COUNTY WATER DISTRICT

BIG DALTON

PUENTE

CREEK

UPPER FEEDER

WASH

CREEK MIDDLE FEEDER MIDDLE

BIG LITTLE

WALNUT DALTON SGVMWD

SAN

DALTON

WASH CHARTER

OAK

CREEK

DIMAS

WASH

CREEK FOOTHILL FEEDER FOOTHILL

WASH SGVMWD PIPELINE SGVMWD FIGURE 2