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Eastern San Joaquin Groundwater Basin Groundwater Management Plan Northeastern San Joaquin County Section 1 Groundwater Banking Authority 34 Introduction to 3.65 MGD of reclaimed waste water is applied to fodder crops on City owned and leased lands. The City of Manteca is expected to grow to over 130,000 by 2025. Recognizing the need for a reliable water supply to meet the demands of growth, the City of Manteca will participate with SSJID in the South County Surface Water Supply Project. At build out in 2025, the City will receive up to 18,500 af/yr of high quality water from the Project. City of Ripon – The city of Ripon is located at the southern edge of the county along State Route 99. The population in 2002 was approximately 11,500 and is expected to grow to 29,900 by 2020. All of the city’s potable water is provided by groundwater wells supplying 4,565 af in 2002, and this is estimated to increase to 12,310 af in 2020 in the 2003 City of Ripon Urban Water Management Plan. In 2002, 1,400 af of non-potable water was supplied by city groundwater wells, and 500 af of non-potable water was supplied with SSJID contracted surface water. In 2020, the city’s non-potable wells are expected to supply the same amount of water, and the SSJID’s contract is expected to increase to 5,080 af. The plan also anticipates 960 af of non-potable groundwater supplied by Nestle in 2020. The City of Ripon Urban Water Management Plan contains 14 demand management measures (DMM) to promote conservation. A few of these are interior and exterior water audits for single family and multi-family customers, large landscape conservation programs and incentives, school education, and water waste prohibition. City of Lathrop – Information not received prior to release of Plan. City of Escalon – Information not received prior to release of Plan. 1.6.3 Overview of Groundwater Management by San Joaquin County East San Joaquin Parties Water Authority – In 1995, County water interests facilitated the ESJPWA to conceive and implement a joint conjunctive use and groundwater banking project with EBMUD. Several alternatives were developed and explored with the goal of implementing the Mokelumne Aquifer Recharge and Storage Project (MARS). In wet years, supplemental surface water obtained would be used by County interest in-lieu of groundwater or be actively recharged using various methods. In dry years, EBMUD would be allowed to extract and export from the Basin a portion of the recoverable supply for use in the EBMUD service area. In order to technically support the concept of aquifer storage and recovery, the ESJPWA undertook the Beckman Injection/Extraction Study (Beckman Study). The Beckman Study involved the injection of water from EBMUD’s Mokelumne River entitlement via the Mokelumne Aqueduct and subsequent monitoring. The Beckman Study provided insight into the Groundwater Basin’s ability to accept injected water. The Beckman Study concluded that the migration of injected water is attributed to many factors including seasonal hydrogeology, regional pumping patterns, and prevailing groundwater gradients. In 2002, the Authority continued the work of the ESJPWA and completed the Beckman Test Final Report. The Report concluded water injected at the site remained in the general vicinity. Further studies are needed to evaluate long-term storage and the overall recoverability of injected water from the underlying aquifer. Further analysis has concluded that the test area is suitable for recharge and that the recoverability of injected water is high.