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• 22 June 2001 <br /> AGE-NC Project No 01-0839 <br /> Page 3 of 7 <br /> 2 3 REGIONAL GEOLOGIC/HYDROGEOLOGIC SETTING <br /> The site is located within the southern San Joaquin Valley which comprises part of the Great Valley <br /> geomorphic province of California The San Joaquin Valley is formed by the Great Valley <br /> geosyncline, which is a large, elongate, northwest-trending asymmetrical structural trough (basin) <br /> It is bordered by the Coast Ranges to the west, the Klamath Mountains and Cascade Range to the <br /> north, and the Sierra Nevada to the east This trough has been filled with sediments derived from <br /> both marine and continental sources Thickness of the sedimentary fill ranges from thin veneers <br /> along the valley edges to more than 20,000 feet in the south central portion of the valley The <br /> sedimentary formations range in age with the older deposits being primarily marine in origin and the <br /> younger deposits being primarily continental Continental-derived sediments were primarily <br /> deposited in Iacustnne, fluvial, and alluvial environments with sediment sources being the mountain <br /> ranges surrounding the valley(Olmsted and Davis, 1961) The site is located on unconsolidated and <br /> semi-consolidated alluvium, lake, playa and terrace deposits of Quaternary age (California Division <br /> of Mines and Geology, 1977) <br /> The Modesto, Riverbank and Turlock Lake Formations and overlying Recent alluvium are the <br /> principal sources of domestic ground water in the 13,500-square mile San Joaquin Valley Ground <br /> Water Basin (Basin 5-22) <br /> 2 4 GROUND WATER DEPTH AND FLOW DIRECTION <br /> Based on information obtained from a nearby site(4648 East Waterloo Road), ground water depth <br /> in the vicinity of the site is approximately 60 feet bsg The prevailing ground water flow direction <br /> in the vicinity of the site is inferred to be toward the east However, flow direction may be both <br /> locally and seasonably variable <br /> 3.0 SCOPE OF WORK <br /> Based on the results of the UST removal soil sampling, an unauthorized release of petroleum <br /> hydrocarbon compounds from the fuel UST system has been determined to have occurred at the site <br /> AGE proposes to collect soil samples and iii-situ grab ground water samples to assess the lateral and <br /> vertical extent of hydrocarbon-impacted soil and ground water The preliminary site assessment will <br /> consist of the following tasks <br /> • Permitting and pre-field work preparations, <br />. • Soil sample collection and analysis, <br /> Advanced GeoEnvironmental,Inc <br />