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1.0 INTRODUCTION/PREVIOUS WORK <br /> This report is being submitted in response to a request by the San Joaquin County Public Health <br /> Services, Environmental Health Division to further define the petroleum hydrocarbon impact to <br /> ' soils and groundwater at 2431 East Mariposa Road, Stockton, California (Figure 1). <br /> ' BJJ Company, Inc operates a truck terminal facility at the subject site. Three underground fuel <br /> storage tanks are mamtamed at the facility Two of the tanks are newly installed double walled <br /> ' tanks used to contain diesel for company trucks. These tanks are located near the facility <br /> entrance. The other tank is a 3500 gallon underground tank located partially beneath one of the <br /> ' maintenance buildings. This tank is the subject tank proposed for in-place abandonment. Figure <br /> 2 depicts the tank and piping locations relative to other facility features <br /> ' <br /> Although ttus tank is approximately 43 years old, there had been no indications of product loss <br /> or tank leakage A monitoring program was implemented beginning in 1985, pursuant to local <br /> and state requirements for all underground storage tanks. Annual tank system tightness tests <br /> utilizing static pressure by applied product head have been conducted as part of the monitoring <br /> program. The most recent test was conducted on March 16, 1990. These tests have consistently <br /> ' found the tank system to be "tight" pursuant to local and state requirements and NFPA <br /> guidelines. Tank test results from 1989 and 1990 tests are presented in Appendix I Daily <br /> ' volume gauging by "sticking" the tank and inventory record checks are also conducted as part <br /> of the monitoring program. Records have reflected no observable losses over the monitoring <br /> ' period. <br /> ' Due to the location of the tank, BJJ Company, Inc. requested and received conditional approval <br /> for in-place abandonment from the Montezuma Fire Protection District. A copy of the Fire <br /> ' District's letter is presented in Appendix II. <br /> ' On June 15, 1990, WaterWork personnel advanced two angled soil borings (ASB-1, ASB-2) <br /> beneath the existing tank. The location and orientation of the borings are depicted on Figure <br /> 2. These borings were advanced at 450 from vertical and terminated beneath the longitudinal <br /> ' WJSR122 NK 1 <br />