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' Site Background Information LOPEZ PROPERTY 1601 Turnpike Road, Stockton, California ' The site is located near the intersection of Turnpike Road and Lincoln Street,in a mostly commercial area of south Stockton, San Joaquin County(Figure 1) The subject property was developed in the mid-1950s as "R Goold and Sons" and utilized for electrical contracting from the mid-1950s through the mid to late 1980's A directory listing of historical occupancy lists"Harbor Signs"as the occupant in the early 1990's,no occupant in 1994 and 1999,and the current owner(Nereida Lopez) ' as the occupant in 2003 The property is presently used for office space, an auto repair shop and an auto body shop REGIONAL GEOLOGIC/HYDROLOGIC 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) The estimated depth to ground water at the site is approximately 20 to 25 ' feet below surface grade(bsg)based on information obtained during the November 2004 monitoring event Ground water flow direction during the monitoring event was towards the southwest However, this may be greatly modified by local recharge and discharge patterns 1 UNDERGROUND STORAGE TANK REMOVAL ' One 1,000-gallon leaded gasoline UST was removed in October 1987, the San• Joaquin County ty Environmental Health Department(EHD)noted hydrocarbon odor and soil discoloration at the time Advanced GeoEnvironmental,Inc