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S#e Background Information TER1VMOUS MARKET 138P West Highway 12,Lodi,Callfomis BACKGROUND The property at 13889 West Highway 12,Lodi,California is currently utilized as Terminous Market. The site is occupied by a one-story market with a septic tank, a residential dwelling with a septic tank, a tool sited amt outhouse,a propane tank, and a domestic well which, according to property owner Charles Jacobs, is not used for drinking water. The site is bordered on the west by the Mokelumne River,and on the north,south,and east by agricultural property.The f ecility,established in 1939,formerly operated two fuel undergrootnd storage tanks(USTs)and two fuel dispensers.The formerUSTs cortsisted of one 530-gallon unleaded gasoline UST and one 550-gallon leaded gasoline UST. REGIONAL GEOLOGIC/HYDROGEOLOGIC SETTING According to Geologic Map of Cad iia,published in 1977 by the State of California Department of Mines and Geology, the site area is located within the Great Valley Geomorphic Province of California.The Groat valley Province is a nearly flat,elongated structural uuu b trending northwest and southeast ftw approximately 430 miles;it is bounded on the east by the Sierra Nevada mountains and on the west by the Coast Ranges. The Province has been filled to its present elevation with thick sequences of sediment ranging in age hem Jurassic to present day,creating a nearly flat-lying alluvial plain extending from the Tehachapi Mountains in the south to the Klamath Morins in the north. The surfifieial and upper several hundred feet of suabanface layers consists of a great thickness of predominsady unconsolidated alluvial and flood plain deposits (primarily sand`, silts, and clays) of Quaternary age, which are derived from the granitic mountains of the Sierra Nevada.Beneath the upper nAmentary deposits lies a thick a xponce of marine deposits of Mesozoic age. These niarine deposits are further umdmiain by a pw)umssic complex of ignaoum and mimic basement rock. The Province is subdivided into two major divnions,desipaied the Socram®elo and San Joaquin VaSays.Tho Sae Ioaquin Valley is drained primarily by the San Joaquin River,and the Modesto, Riverbank,and Turlock Lake Formations and overlying Racent alluvium an the principal sources of domestic ground waw in the 13,380-square mile San Joaquin Valley (around Water Basin (Basin 5-22).The nearest su ince water feature in the vicinity of the property is an irrigation drainage ditch,loafed approximately 120 feet south of Tenninouus Market,and the Mokelumne River,located appro--ately 2,380 feet west of the site. Bawd on the United States Department of Agriculture-Natural Resources Conservation Service's Web Soil Sswveey map,surface sediment at the site area is classified as Kingile muck. The Kingile series consists ofvery deep,very poorly drained soils formed in highly decomposed organic material .erravftW U&