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' 16 December 2005 • AGE-NC Project No. 04-1214 Page 3 of 8 thick sequences of sediment ranging in age from Jurassic to Recent, creating a nearly flat lying ' alluvial plain extending 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 Formations 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. ' The closest surface water feature to the site is the Stanislaus River located approximately 9,000 feet south of the site. The river is used primarily for domestic and agricultural uses and recreational . boating. 1 2.3. LOCAL GROUND WATER SETTING Ground water is currently encountered at a depth of approximately .8`feet below surface grade(bsg) ' at the site and has a north to northwesterly flow direction. Ground water occurs in a generally sandy layer extending relatively horizontal and somewhat continuous over the site. ' 2.4. WELL SURVEY ' A survey of ground water wells within 2,000 feet of the subject property was conducted on 18 November 1998.Domestic Wells: Water at the site is currently supplied by a domestic well,located at the southern edge of the site. Off-site domestic wells include a well north of the site, which ' supplies water for the adjacent Jimco Truck Stop, one well which serves the residence northeast of the site and one well which serves a small restaurant and truck-wash station south of the site. This well is schedule for destruction due to high nitrate contamination. Municipal Wells: The City of ' Ripon has established twelve wells; five of the twelve wells have been either abandoned or are off- line due to the presence of high nitrate concentrations. Seven wells are operational and are tested or have been tested for California Title 22 contaminants. One well is located approximately 750 feet ' west of the site; this well is the only municipal well within 2,000 feet of the site. 1 i Advanced GeoEnvironmental,Inc. 1