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Site Background Information THATER PROPERTY (former TUCKER CONSTRUCTION) 336 East Locust Street, Lodi, California The site is located at 336 East Locust Street in Lodi, California(Figure 1). The property is paved with asphalt and currently contains no standing structures.Two 1,000-gallon gasoline underground storage tanks (USTs) were removed from the site in the mid 1980s. REGIONAL GEOLOGIC/HYDROGEOLOGIC SETTING The property is situated within the Great Valley Geomorphic Province of California (GVGP), a large, elongate, northwest-trending, asymmetric structural trough. The GVGP has been filled with thick sequences of sediment ranging in age from Jurassic to Recent, creating a nearly flat- lying alluvial plain that extends from the Tehachapi Mountains in the south to the Klamath Mountains in the north. The western and eastern boundaries of this province are the California Coast Range and the Sierra Nevada, respectively. Rocks composing the basement complex of the province have not been completely defined but are believed to be of metamorphic and igneous origins. The northern and southern portions of the GVGP have been designated the Sacramento and San Joaquin Valleys, respectively. The Modesto, Riverbank, and Turlock Lake Formations and overlying Recent alluvium are the principal source of domestic ground water in the 13,500-square-mile San Joaquin Valley Ground Water Basin (Basin 5-22). This basin is drained primarily by the San Joaquin River. The nearest surface water feature in the vicinity of the property is the Moklumne River,approximately 0.8 miles north of the subject property. The estimated depth to ground water at the property is approximately 30 feet to 35 feet below surface grade (bsg), based on the map titled Lines of Equal Depth to Groundwater Spring 1996 published by the San Joaquin County Flood Control District and Water Conservation District (FCD&WCD).The map titled Lines of Equal Elevation of Groundwater Spring 1996,also published by the FCD&WCD, shows the property to be in an area where ground water flows toward the south and southwest, but this may be modified by changing recharge and discharge patterns. Based on quarterly ground water monitoring events conducted at the site beginning in April 2005, depth to ground water is approximately 47 feet to 50 feet bsg and flows toward the southwest. Ground water is considered to be of beneficial use and is used for domestic, industrial, and commercial purposes. UNDERGROUND STORAGE TANK REMOVAL Based on conversations conducted by J.H. Kleinfelder & Associates (JI-IK) with former property owner Tom Tucker and San Joaquin County Environmental Health Department(EHD) personnel, two 1,000-gallon USTs were removed from the site in 1984 or 1985. No further information regarding the excavation and removal of the USTs is available to AGE at this time. Advanced GeoEmironmental,Inc.