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Site Background Information <br /> ENTERPRISE INVESTMENTS (Former J.B. Murphy Trucking) <br /> 355 Enterprise Place, Tracy, California <br /> is <br /> SITE LOCATION AND DESCRIPTION k <br /> The site is located in a commercial/industrial area of north Tracy, California, at an estimated <br /> .� elevation of 5 feet above mean sea level (MSL). The site is presently occupied by Jimco <br /> r <br /> Construction and Rerailing. The site is located on the north side of Enterprise Place. The major <br /> F, <br /> portion of the site consists of an unpaved dirt area used as a parking lot for trucks.A two-story office <br /> ==� facility and truck garage are presently located on the site. r <br /> REGIONAL GEOLOGIC SETTING <br /> -; The site is located within the northern San Joaquin Valley,which comprises part of the Great Valley <br /> geomorphic province of California. The San Joaquin Valley is formed by the Great Valley <br /> geosyncline, a large, elongate, northwest-trending, asymmetrical structural trough (basin). It is <br /> bordered by the Coast Ranges to the west,the Klamath Mountains and Cascade Range to the north, <br /> "j and the Sierra Nevada to the east. This trough has been filled with sediments derived from both <br /> marine and continental sources.Thickness of the sedimentary fill ranges from thin veneers along the <br /> valley edges to more than 20,000 feet in the south centralportion of the valley. The sedimentary <br /> `~ formations vary in age, with the older deposits being primarily marine in origin and the younger <br /> deposits continental. Continental-derived sediments were typically deposited in lacustrine,fluvial, <br /> and alluvial environments with sediment sources being the mountain ranges surrounding the valley <br /> (Olmsted and Davis, 1961). The site is located on unconsolidated and semi-consolidated alluvium, <br /> lake, playa, and terrace deposits of Quaternary age (California Division of Mines and Geology, <br /> ! 1977). The Modesto,Riverbank,and Turlock Lake Formations and overlying Recent alluvium are <br /> - the principal sources of domestic ground water in the 13,500-square mile San Joaquin Valley <br /> Ground Water Basin(Basin 5-22). <br /> STRATIGRAPHY ' <br /> Generally, gray to brown, damp to saturated, silty clay was encountered from surface grade to <br /> approximately 15 feet to 20 feet below surface grade(bsg)and 25 feet to 30 feet bsg.Discontinuous <br /> intervals of brown, saturated, sandy silt of varying thickness were encountered at 15 feet to 20 feet <br /> bsg and 30 feet to 35 feet bsg. Pea gravel was encountered in the former underground storage tank <br /> (UST)pit at 5 feet and 10 feet bsg. <br /> UNDERGROUND STORAGE TANK REMOVAL <br /> On 12 August 1997,one 10,000-gallon diesel UST was removed from the site by Stockton Service <br /> Advanced GeoEnvironmental,Inc. <br /> Gj <br />