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1 <br /> Site Background Information <br /> .' Lodi Airport <br />' 23987 North Highway 99, Acampo, California <br />' SITE DESCRIPTION <br /> The site is located on the northeastern portion of the Lodi Airport at 23987 North Highway 99, <br /> IAcampo, California and situated in an area of agricultural land-use and is bordered by California <br /> State Highway 99 to the east and agricultural land to the south through north The Lodi Airport is <br />' used as a private airport facility for agricultural and recreational flying Several airplane hangers, <br /> maintenance facilities, storage facilities, one office structure and a restaurant are located on the <br /> property The Jahant Slough,the nearest surface water body is located approximately 100 feet north <br />' of the western-most section of the airport property The site presently utilizes two domestic wells <br /> Most of the site is paved with asphalt, however, some areas of dirt and grassy landscaping are <br /> located near the former UST area <br /> I <br /> REGIONAL GEOLOGIC/HYDROGEOLOGIC SETTING <br /> The Great Valley has been filled with sediments derived from both marine and continental sources <br /> Thickness of the sedimentary fill ranges from thin veneers along the valley edges to more than <br /> . 20,000 feet in the south central portion of the valley The sedimentary formations range in age from <br /> Jurassic to Recent,with the older deposits being primarily marine in origin and the younger deposits <br /> being primarily continental Continental-derived sediments were primarily deposited in lacustrine, <br /> I fluvial,and alluvial environments with sediment sources being the mountain ranges surrounding the <br /> valley(Olmsted and Davis, 1961),the site itself is located on unconsolidated and semi-consolidated <br /> alluvium, lake, playa and terrace deposits of Quaternary age (California Division of Mines and <br /> I Geology, 1977) Rocks composing the basement complex of the Province have not been completely <br /> defined but are believed to be metamorphic and igneous in origin <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 /> I <br /> SITE ASSESSMENT ACTIVITIES <br /> I On 21 December 1998 AGE submitted a workplan to the San Joaquin County Public Health <br /> P q tY <br /> Service-Environmental Health Division(FHS-EHD)for in-place abandonment of UST and collect <br /> soil samples <br /> I On 19 March 1999,as directed by PHS-EHD,AGE collected one domestic water well water sample <br /> identified as DW-I from the domestic well directly north of the UST area The sample was analyzed <br /> for total petroleum hydrocarbons quantified as aviation fuel (TPH-ag), benzene, toluene, <br /> I ethylbenzene, xylenes (BTEX), and methyl-tertiary butyl ether (MTBE) by EPA methods 5030, <br /> modified 8015, and 8020 or 602 No analytes were detected in the sample above the method <br />