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Site Background Information �E g Lodi Airport 23987 North Highway 99, Acampo, California SITE DESCRIPTION The site is located on the northeastern portion of the Lodi Airport at 23987 North Highway 99, Acampo, California and situated in an area of agricultural land-use and is bordered by California State Highway 99 to the east and agricultural land to the south through north The Lodi Airport is used as a private airport facility for agricultural and recreational flying Several airplane hangers, maintenance facilities, storage facilities, one office structure and a restaurant are located on the property The Jahant Slough,the nearest surface water body is located approximately 100 feet north of the western-most section of the airport property The site presently utilizes two domestic wells Most of the site is paved with asphalt,however,some areas of dirt and grassy landscaping are located near the former UST area REGIONAL GEOLOGIC/HYDROGEOLOGIC SETTING The Great Valley has been filled with sediments derived from both marine and continental sources Thickness of the sedimentary fill ranges from thin veneers along the valley edges to more than 20,000 feet in the south central portion of the valley The sedimentary formations range in age from Jurassic to Recent,with the older deposits being primarily marine in origin and the younger deposits being primarily continental Contmental-derived sediments were primarily deposited in lacustrzne, fluvial,and alluvial environments with sediment sources being the mountain ranges surrounding the valley(Olmsted and Davis, 1961),the site itself is located on unconsolidated and semi-consolidated alluvium, lake, playa and terrace deposits of Quaternary age (California Division of Mines and Geology, 1977) Rocks composing the basement complex of the Province have not been completely defined but are believed to be metamorphic and igneous in origin 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) ' SITE ASSESSMENT ACTIVITIES On 21 December 1998 , AGE submitted a work plan to the San Joaquin County Public Health Service-Environmental Health Division(PHS-EHD) for in-place abandonment of UST and collect soil samples iOn 19 March 1999,as directed by PHS-EHD,AGE collected one domestic water well water sample . identified as DW-1 from the domestic well directly north of the UST area The sample was analyzed for total petroleum hydrocarbons quantified as aviation" fuel (TPH-ag), benzene, toluene, ethylbenzene, xylenes (BTEX), and methyl-ternary butyl ether (MTBE) by EPA methods 5030,