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1 • <br /> August 18, 1993 ���WA <br /> ni <br /> Unocal Service Station No 6981, Stockton, Califora Wnrking To Restart, Nature <br /> 1 PROPOSED WORK <br /> The following work will be conducted according to RESNA's field procedures section, our <br /> Site Safety Plan (RESNA Industries, Report No 38032-93S, January 1993) and in <br /> r <br /> accordance with the Leaking Underground Fuel Tank (LUFT) Field Manual Guidelines <br /> for Site Assessment, Cleanup, and Underground Storage Tank Closure (CRWQCB, October <br /> 1989) <br /> RESNA proposes the following work <br /> o Prior to installing the vapor wells, RESNA will acquire permits from San <br /> Joaquin Public Health Services Department,contact underground service alert <br /> to delineate public utility lines, and update the Site Safety Plan for the site <br /> a Observe drilling of two 10-inch diameter soil borings (by a licensed well <br /> driller) to approximately 30 feet Observe the installation of 4"-inch diameter <br /> vapor-extraction wells in the borings Collect relatively undisturbed soil <br /> samples at 5-foot intervals from the ground surface to the total depth of each <br /> boring for geologic logging and possible chemical analysis Submit at least <br /> two soil samples per boring to a State-certified laboratory approved by <br /> Unocal Analyze soil samples for total petroleum hydrocarbons as gasoline <br /> (TPHg) and benzene, toluene, ethyl-benzene, and total xylenes (BTEX) <br /> Collect four soil samples from the drill cuttings and have them composited by <br /> the analyzing laboratory into one for analysis of TPHg and BTEX for soil <br /> disposal characterization. RESNA will inform Unocal of their disposal <br /> options, however, final disposal remains the responsibility of Unocal <br /> o Prepare a letter report summarizing our findings and conclusions and submit <br /> it to Unocal <br /> 38032-14W 5 <br />