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SITE HEALTH & SAFETY PLAN <br /> 1.0 INTRODUCTION <br /> A. Overview <br /> This Site Safety Plan has been prepared by Pacific Environmental Group, Inc. <br /> (PACIFIC) for the installation of two off-site groundwater monitoring wells at former <br /> Unocal Service Station 2859, located at 1665 Pacific Avenue, in Stockton, California. <br /> The site is currently a vacant lot. Unocal originally leased the site in January 1947. The <br /> station was demolished between February and April 1988. <br /> During station demolition, two 10,000-gallon underground gasoline tanks were removed <br /> from a common excavation along with a separate 550-gallon waste oil tank. During <br /> tank removal, 1,100 cubic yards of soil were removed from the site. Soils within the <br /> tank excavation were removed to a depth of 30 feet. Soils at the base of the excavation <br /> contained a maximum of 18 parts per million (ppm) total petroleum hydrocarbons <br /> calculated as gasoline (TPH-g) and 1.7 ppm benzene. Soils beneath the product lines <br /> were found to have a maximum TPH-g concentration of 6 ppm. No benzene was <br /> detected in the product line samples. No hydrocarbons were detected beneath the <br /> waste oil tank. <br /> Kleinfelder, Inc. installed five soil borings (KB 1 through K135) at the site in <br /> January 1988. These borings were installed around the former tank complex, adjacent <br /> to the product islands, and adjacent to the former waste oil tank. <br /> Between June 1988 and February 1992, Applied and Resna (formerly Applied <br /> Geosystems) installed a total of seven monitoring wells (MW-1 through MW-7) and <br /> 3104001/SSPDRILL 1 October 7, 1993 <br />