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0 0 Site Background Information COMFORT AIR, INC. 1607 Turnpike Road, Stockton, California The Comfort Air facility is a heating and air conditioning sales and repair business located at 1607 Turnpike Road, Stockton,California,in an area of low topographic relief in southwestern Stockton. 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, 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(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). UNDERGROUND STORAGE TANK REMOVAL One 550-gallon gasoline(UST)was removed from the site in January 1989.Following tank removal, soil samples were collected beneath the UST and submitted to a laboratory for analysis for petroleum hydrocarbons. Total petroleum hydrocarbons as gasoline (TPH-g)was reported in soil samples at concentrations as high as 5,800 milligrams per kilogram(mg/kg). Advanced GeoEnvironmental,Inc.