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LEVINE•FRICKE <br /> DTSC Comment 2: Levine-Fricke will screen the soil samples in <br /> the field for volatile organic compounds (VOCs) in soil <br /> headspace using a PID. If PID readings are greater than <br /> background levels at the 10-foot sample interval depth (the <br /> proposed total depth of each boring) drilling and soil <br /> sampling will continue for an additional 5 feet or until the <br /> PID readings of the soil samples are equivalent to background <br /> levels. Based on the PID readings, one additional soil sample <br /> collected from each 5-foot interval of increased boring depth <br /> will be submitted for chemical analysis. <br /> DTSC Comment 3 : As discussed, borings proposed to be drilled <br /> in the vicinity of former borings ED-2, ED-3, and ED-4 will be <br /> located within five feet of the former borings and one <br /> additional boring will be drilled in the corner of the empty <br /> drum storage area between ED-3 and ED-4. <br /> DTSC Comment 4: All downhole drilling and sampling equipment <br /> will be steam cleaned before use at each drilling location. <br /> Steam cleaning of drilling equipment will be conducted off <br /> site by the drilling contractor. If steam-cleaning services <br /> are required on site, the rinsate water will be contained, and <br /> stored on site in appropriately sealed and labeled 55-gallon <br /> drums. <br /> DTSC Comment 5: In accordance with San Joaquin County Local <br /> Health District regulations, the completed boreholes will be <br /> backfilled to the land surface with neat cement grout <br /> containing a maximum of 3 to 5 percent bentonite. <br /> Waste Management <br /> We are proposing to store the soil cuttings from borehole <br /> drilling on plastic sheeting placed on a cement or asphalt <br /> paved area of the site. Additionally, the soil will be <br /> covered with plastic sheeting. This has proven to be a <br /> cost-effective procedure for storing soil until a disposal <br /> option is selected. <br /> soil Sample Analysis <br /> DTSC Comment 1: Levine-Fricke will assign a sample <br /> identification number (ID) for each soil sample. The sample <br /> ID will consist of the borehole number and sample depth <br /> interval; for example, ED-5 (2 . 01-2 .51 ) . Figure 2 is correct; <br /> soil samples collected from the former ultra etch storage area <br /> will be analyzed for VOCs (EPA method 8010) , arsenic (EPA <br /> 2617\2617CMTS:wlk 2 <br />