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south-of the excavation; both borings are in the presumed upgradient direction from the tanks <br /> according to the San Joaquin CountyFlood Control <br /> . The <br /> Ma purpose Map. p rpp of these borings is to <br /> provide an indication of the laterai extent of soil contamination. The fourth boring will be drilled <br /> east of the excavation,and will.be drilled to groundwater so that a water sample can be collected. <br /> I` The precise,depth of groundwater in,the area is unknown at this time, but it is our understanding <br /> from Mr.Hartzell that he recently measured the depth at approximately 80 feet in a domestic well, <br /> on the property. <br /> Soil samples will be collected at 5-foot intervals and boring logs will be prepared. We estimate <br /> that twenty samples will be preserved for laboratory analysis, and five of these will be analyzed <br /> for gasoline oxygenates using EPA method 8260. Selected shallow samples will also be analyzed <br /> for total lead. 1 <br /> Augers will.be steam-cleaned between borings, and drill cuttings will be placed on'plastic il( <br /> sheetijig pending laboratoryanalysis to profile them for disposal. JJ' <br /> 3.0 PROCEDURES <br /> 1) Prepare a site-specific Health and Safety PIan <br /> 2) .Submit an application for a drilling permit <br /> 3) Notify PHS/EHD at least 48 hours prior to field work <br /> 4) Drill four vegicaI borings with 8-inch diameter hollow-stem augers <br /> 5) Collect soil samples at 5-foot intervals and screen for hydrocarbon odors using a portable <br /> PID; describe the samples on the boring log <br /> 6) Preserve the bottom sleeve of each sample on ice for possible laboratory analysis <br /> 7) Decontaminate the sampling and drilling equipment between borings <br /> 8) Place drill cuttings on plastic sheeting <br /> 9) Collect a groundwater sample through the augers from the deepest boring <br /> 10) Use a tremmie pipe to backfill the borings with-cement grout <br /> 11) Transmit selected soil and water samples to a state-certified laboratory for analysis'of: <br /> Total Petroleum Hydrocarbons as gasoline <br /> Benzene,'toluene,ethylbenzene,xylene, and MTBE <br /> Gasoline oxygenates <br /> Total lead <br /> 12)Prepare a Preliminary Investigation and Evaluation report, signed by a California <br /> Registered Geologist <br /> - I <br /> i <br />