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Mr. Kenneth Earnest <br /> May 18, 1994 <br /> Page 2 <br /> • Implementation of Level D health and safety personnel protective measures. <br /> • Advancement of six soil borings near the west end of the former underground storage <br /> tanks (Figure 5). Two of the soil borings will be drilled within conductor casing <br /> installed during underground storage tank removal activities in October 1993. A third <br /> soil boring, SB-3, will be drilled at an angle of approximately 30 degrees to below <br /> the fuel island area. Each soil boring will be advanced using hollow-stem auger <br /> drilling techniques. Soil cuttings from each soil boring will be stored on site on <br /> plastic (and covered with plastic) pending receipt of analytical results and <br /> characterization for disposal. <br /> • Collection of soil samples from each soil boring at 5-foot-depth intervals and/or at <br /> changes in lithology with a modified California split-spoon sampler. Recovered soil <br /> samples will be classified according to the Unified Soil Classification System (USCS). <br /> • Screen the recovered soil samples in the field with a photoionization detector (PID) <br /> for the presence of organic vapors. Borings will be terminated if two consecutive soil <br /> samples record a concentration of less than 5 parts per million (ppm) organic vapors <br /> with the PID and/or wet soil is encountered. <br /> • Possible installation of the vadose zone well nest(s) will be based on observations of <br /> apparent concentrations of petroleum hydrocarbon constituents made in the field. <br /> Possible installation of nested vapor extraction well(s) (to potentially be used at a later <br /> date for remediation) in the borings within the conductor casings and in at least one <br /> additional boring. <br /> • Submittal of selected soil samples for chemical analysis based on field observations <br /> and PID readings. Soil samples will be analyzed for TPHg, TPHd, and BTEX by a <br /> state-certified laboratory. <br /> • Replacement of monitoring well MW-7 by: <br /> - Drilling out the construction materials of the damaged monitoring well. <br /> - Reinstallation of monitoring well MW-7 in the boring of the damaged well. <br /> • Compilation and review of the collected data and preparation of a results report. <br /> ACTON- <br /> MICKELSON - LRYrWg.MAF <br /> van DAM,INC. <br /> Consulting Scientists,Engineers,and Geologists <br />