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� � <br /> :.72 <br /> tet ' �a ' a.,•. _ y, r r et� s ' <br /> �� .,. _ - �� <br /> i <br /> 4.� <br /> Mr. David Heinrich <br /> November 10, 1988 <br /> 202/150-4150 <br /> Page 8 <br /> Develop the monitoring wells and obtain representative <br /> water samples for laboratory analyses <br /> guidelines, following CRWQCB <br /> Survey well head elevations and locations for vertical <br /> and horizontal control. <br /> Monitor the wells to determine depth to groundwater and <br /> to detect the presence of free floating hydrocarbons, <br /> if any. <br /> All soil borings and monitoring wells would be drilled with a <br /> truck-mounted drill rig, using 10-inch outside diameter (O,D, <br /> hollow-stem augers. A field geologist would supervise the ) <br /> drilling and continuously Io <br /> g the With the Unified Soil ClssificationiSystemls �unSaild an accordance <br /> during drilling and excavation operations woulgenerated <br /> d be <br /> Plastic-wrapped plastic sheeting and covered. The lastic-wrapped soil would be <br /> Placed an <br /> left on site for disposal at a <br /> laboratory analysislater date pending the results of <br /> , Figure 4 details the locations of the <br /> itoring wellsUnerround ut <br /> nformationiisbnot presently orings and navailable and•willdbegincldedility <br /> following reports. in <br /> soil samples would bs obtalned with a 2,5-inch O.D. split-spoon <br /> sampler lined with three 2-inch diameter by 6-inch long brass <br /> sample tubes. Samples would be taken at 5-foot intervals by <br /> driving the sampler 18 inches ahead of the augers at each sample <br /> Point. The retained samples would then be sealed, labeled, and <br /> Placed on ice in an insulated cooler for delivery to an analyti- <br /> cal laboratory for analyses. Appropriate Chain-of-Custody forms <br /> would be maintained with ti.a samples at all times. <br /> An initial screening of the soil samples for hydrocarbon con- <br /> stituents would be conducted in the field using a photo-ioniza- <br /> tion detector ,PID) . PID readings would be used in conjunctic:j <br /> with field observations (i.e. odors) to select samples for <br /> lBTEX aboratory analyses. The soil and TPH as gasoline by EPA samples would then ae for <br /> for <br /> water samples would be analyzed Methods 5030/8015/8020. Ground- <br /> EPA Methods 5030/Modified 602, for BTZX and TPH as gasoline by <br /> An assessment report would be generated following hydrocarbon <br /> definition using the soil bnr9ng and monitoring well analytical. <br /> data. This report would provide maps depicting _ <br /> metric surface as well as dissolved benzene and totalpvolatile <br />