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Site Background Information LODI AIRPORT 23987 North Highway 99,Acampo,California SITE DESCRIPTION Lodi Airport is a private airport utilized for agricultural and recreational flying; airplane hangers, maintenance facilities, storage facilities, one office structure and a restaurant are located on the property. The property is bordered by California State Highway 99 to the east and agricultural land to the north, south and west. The area of investigation(the site)is located on the northeastern corner of Lodi Airport,adjacent to the restaurant. The site was er location of three underground storage tanks (USTs)utilized for storage of aviation fu 1. Mo5`tof'the site is paved with asphalt with the exception of an area of grassy landscaping behind staurant. One domestic well(DW-1),utilized by the restaurant,is located immediately adjacent to the former UST location; in addition, one other domestic well is located approximately 950 feet south of the former UST area(Figure 2). REGIONAL GEOLOGIC SETTING The site is situated within the southern portion of the Great Valley Geomorphic Province of California, a large, elongate, northwest trending, asymmetric structural trough. The northern and southern portions of the Province have been designated the Sacramento and San Joaquin Valleys, respectively.The Province is bordered by the Coast Ranges to the west,the Klamath Mountains and Cascade Range to the north, and the Sierra Nevada to the east. 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. Continental-derived sediments were primarily deposited in lacustrine, fluvial,and alluvial environments with sediment sources being the mountain ranges surrounding the valley(Ohnsted 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. Based on a General Soil Map from the San Joaquin County Soil Survey, published by the United States Department of Agriculture Soil Conservation Service in 1992, the site area is described as within the Jacktone-Hollenbeck-Stockton(JHS)association.The JHS soils are located on basin rims and within basins, and generally consist of somewhat poorly drained and moderately well drained, fine-textured soils that are moderately deep and deep to a cemented hardpan.The JHS soils generally formed in alluvium from mixed rock sources. Advanced GeoEnvironmental,Inc.