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13 May 2002 AGE-NC Project No. 03-1023 Page 2 of 5 g) was detected in the same sample at 1.1 mg/kg. TPH-d and TPH-g were also detected in the stockpiled soil sample STK-1 at concentrations of 81 mg/kg and 1.3 mg/kg, respectively. The laboratory report (CT214-0304018) and chain-of-custody forms are presented in Appendix A. 2.4. SITE HYDROGEOLOGIC CONDITIONS The closest surface water feature to the site is the Stockton Diverting Canal, located approximately 1500 feet northeast of the site. Water from the Diverting Canal drains into the Calaveras River and then to the San Joaquin River Deep Water Channel. Based upon well information obtained from nearby sites, ground water flow direction is northerly and is currently estimated to occur at a depth of approximately 50 feet below surface grade(bsg). Ground water occurs in a generally sandy layer extending from approximately 40 feet bsg to 60 feet bsg. The sedimentary units are relatively horizontal and continuous over the area. 2.5. REGIONAL GEOLOGIC CONDITIONS The site is situated within the Great Valley Geomorphic Province of California, a large, 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 lying 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 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. 3.0. SCOPE OF WORK Based on the laboratory analysis of soil samples collected and field observations noted during UST removal,petroleum hydrocarbon impacts to soil appear to be located immediately west of the of the former fuel UST,beneath the former dispenser island. The proposed interim soil remediation scope of work will include the following tasks: Advanced Geo Enviro n mental