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' 6 ' Ms. Vera Fischer, P.G., RWQCB Work Plan for Additional Site Assessment 1817 South Fresno Avenue, Stockton, CA Page 2 April 24, 2017 Project No. 2154-1817-01 SITE DESCRIPTION The Site is located south of the intersection of State Highway 4 (West Charter Way) at 1817 South Fresno Avenue, Stockton, California, on the west side of the intersection of South Fresno Avenue and La Vita Drive. The property is located in a mixed residential and commercial neighborhood in southwest Stockton, approximately 1.3 miles south of the port of Stockton Turning Basin and 0.75 miles northeast of the San Joaquin River. The property is currently used as a truck, recreational vehicle, and boat parking area. The current configuration of the property is depicted on Figure 2. SITE HISTORY Petroleum hydrocarbon impact to the subsurface was discovered in 1992, at the time that two underground storage tanks (USTs) were removed from the subsurface. Beginning in 1997, subsurface investigation and sampling work was performed in order to assess conditions and levels of contaminants beneath the property. This work included the installation of 31 monitoring/remediation wells at the Site, advancement of at least 15 additional soil borings, and performance of groundwater monitoring and sampling for nearly 20 years. Table 1 provides a summary of information concerning the construction of the monitoring and remediation wells. The following presents a historical summary of conditions and events at the Barnes Trucking Facility, based largely on information provided from data and reports available on the State of California's GeoTracker website. Fine grained soils (clay/silt mixtures) are predominately encountered between surface grade and approximately 20 to 25 feet below ground surface (bgs). Clayey sand and silty sand have predominately been observed from 20 to 25 feet bgs to 36 feet bgs, the maximum depth explored at the property. Based on the available data, most of the petroleum hydrocarbon mass appears situated between about 15 and 30 feet below surface grade. Groundwater monitoring and sampling beneath the property has been performed since September 1997, and is ongoing. Groundwater levels beneath the property have fluctuated between about 4 and 12 feet bgs between 1997 and March 2017. Groundwater flow beneath the property has been consistently to the southeast. Figures 5 and 6 illustrate the generalized extent of GRO and benzene in groundwater using March 2017 data. Groundwater samples are no longer tested for fuel oxygenates, including methyl tertiary butyl ether (MTBE), due to the absence of these analytes in historical samples. K:Barnes Trucking\ Work Plansthames trucking work plan 2017.doc STRATUS