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27 December 1996 AGE-NC Project No 95-0143 ' Page 2 of 19 23 REGIONAL GEOLOGICAL/HYDROGEOLOGICAL SETTING ' The site is situated within the Great Valley Geomorphic Province of California, a Iarge, elongate northwest tending, asymmetric structural trough The Great Valley Province has been filled with thick sequences of sediment ranging in age from Jurassic to Recent, creating a nearly flat Iying alluvial plain, which extends from the Tehachapi Mountains in the south to the Klamath Mountains ' in the north The western and eastern boundaries of this province are comprised of the California Coast Range and the Sierra Nevada, respectively Rocks composing the basement complex of the province have not been completely defined but are believed to be of metamorphic and igneous ' origin The Great Valley Province has been subdivided into two major divisions identified as the Sacramento and San Joaquin Valleys ' The Modesto Riverbank and Turlock Lake Forn-iations and overlying Recent alluvium are the principal sources of domestic ground water in the 13,500-square mile San Joaquin Valley Ground Water Basin (Basin 5-22) This basin is drained primarily by the San Joaquin River 1 2 4 LOCAL GROUND WATER SETTING The closest surface water feature to the: site is the Stockton Deep Water Channel (McLeod Lalte) ' located approximately 500 feet south of the site Water from the Deep Water Channel is ptimarily used for commercial and recreational boating Ground water is currently encountered at a depth of approximately 21 feet below surface grade (bsg), and has a northerly flow direction, away from the ' deep water channel Since the Deep Water Channel is up-gradient with respect to the ground water flow direction, impacted water at the site does not pose a threat to beneficial use of the Deep Water Channel Ground water occurs in a generally sandy Iayer extending from approximately 20 feet bsg ' to 36 feet bsg The sedimentary units are relatively horizontal and continuous over the site Recent depth to ground water information is summarized on Table 2 25 MUNICIPAL WELL SURVEY Drinking water near the site is supplied by the City of Stockton municipal wells California Water Service Company (Cal Water) maintains a municipal well and tank approximately 1,100 feet west I of the site at Lindsey Street and Edison Street No other municipal wells maintained by the City of Stockton or Cal Water are located within 2,000 feet of the site The nearest municipal well located down-gradient from the site is approximately 2,600 feet northeast of the site on East Poplar Street, between San Joaquin Street and Hunter Street First encountered ground water is not used for drinking or irrigation I