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Eastern San Joaquin Groundwater Basin Groundwater Management Plan John Izbicki US Geologic Survey Patrick Dwyer US Army Corps of Engineers Other Participants&Agencies Barbara Williams Sierra Club Carolyn Ratto California Center for Collaborative Policy David Beard Great Valley Center Gerald Schwartz East Bay Municipal Utility District Gina Veronesc Camp, Dresser, &McKee James Cornellius Calaveras County Water District James Moore Galt Economic Development Task Force John Aud Stanislaus County Larry Diamond Calaveras County Water District Mark Williamson Saracino-Kirby-Snow Robert Vince Camp, Dresser, &McKee Ron Addington Business Council, Inc. The Authority will continue to seek the input of its neighbors and interest groups during the implementation of the Groundwater Management Plan and any future planning efforts. ES-5 Consistency with Water Code Section 10750 et. seq. Groundwater management is the planned and coordinated effort of sustaining or improving the health of the underlying basin in order to meet future water supply needs. With the passage of Assembly Bill (AB) 3030 in 1992, local water agencies were provided a systematic way of formulating groundwater management plans and granted the Authority to implement those plans through fees and assessments. AB 3030 also encourages coordination between local entities through joint power authorities or memorandums of understanding. In 2002, the passage of Senate Bill (SB) 1938 further emphasized the need for groundwater management in California. SB 1938 requires AB 3030 groundwater management plans to contain specific plan components in order to receive state funding for water projects. Table ES- 4 illustrates the recommended components of a groundwater management plan as outlined in AB 3030 and the required sections under SB 1938. Table ES-4 also indexes the sections of this Plan where the recommended or required AB 3030/SB 1938 components are addressed. ES-6 Eastern San Joaquin County Hydrogeology Current and historical groundwater pumping rates exceed the sustainable yield of the underlying groundwater Basin on an average annual basis. Historic groundwater level trends as seen by well hydrographs throughout the Basin illustrate the following trends: 1. In the central portion of the Basin, the groundwater table dropped continuously from the 1950s to the early 1980s. Inclines during the early 1980s are attributed to extreme wet years of heavy rainfall. 2. In the northern part of the Basin, groundwater levels declined into the early 1990s. 3. Beginning in the early 1980s, a distinct drawdown and recovery cycle appears be driven by climatic conditions more than long-term changes in groundwater use. Northeastern San Joaquin County Executive Summary Groundwater Banking Authority 5