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05 August 1999 AGE-NC Project No. 98-0497 Page 2 of 5 (milligrams per kilogram). 2.3. REGIONAL GEOLOGIC SETTING The property is situated within the Great Valley Geom rphic Province of California, a large, elongate, northwest trending, asymmetric structural troug i. The Great Valley Province has been filled with thick sequences of sediment ranging in age from urassic to Recent,creating a nearly flat- lying atlying alluvial plain,extending from the Tehachapi Moun ' in the south to the Klamath Mountains in,the north. The western and eastern boundaries of thus p ovince are comprised of the California Coast Range and the Sierra Nevada,respectively.Rocks c)mposing the basement complex of the province have not been completely defined but are belie red to be metamorphic and igneous in origin.The northern and southern portions of the Great V ley Province have been designated the Sacramento and San Joaquin Valleys,respectively. Based on the General Soil Map from the San Joaquin Counry Soil Survey,published by the United States Department of Agriculture Soil Conservation Service in 1992, the site area is within the Jackson-Hallenbeck-Stockton (JHS) association. The JHS soils are located within basins, and generally consist of moderate to poorly drained fuse texturc d soils. The soils are generally derived from both marine and non-marine sediment, and are generally formed in alluvium derived from mixed crock sources. The Modesto,Riverbank,Turlock Lake Formations and ov lying recent alluvium are the principal sources of domestic ground water in the 13,500 square-mile an Joaquin Valley Ground Water Basin (Basin 5-22). This basin is drained primarily by the San R aquin River.The nearest surface water feature in the vicinity of the property is the Morrison-51ou ;approximatelyx1;Q00-feet-north-af the property, 2.4. GROUND WATER DEPT14 AND FLOW DIRECTION Based on review of the Lines of Equal Depth to Groundwa r, Fall 1997 map published by the San Joaquin County Flood Control District and Water Conservati Dn District(FCD&WCD),the estimated depth-to-ground water-at-She-site-is-between-60-and,-70 feet bflow surface grade(bsg).Review of the map Lines of Equal Elevation of Groundwater, Fall 1997(F D&WCJD)depicts the regional ground water flow direction towards thenortheast: Review of historical depth to ground water maps(FCD& CD)dating back to 1973 suggests that ground water depth near the site has fluctuated between 60 and 100 feet bsg. AdvanrW GraEuvfronmental,Inc.