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FR n <br /> August 7, 1987 <br /> Project 195-1.1 <br /> to drilling. Soil samples will be taken using a modified California sampler <br /> and 2 inch diEwieter bras., liners at cne foot below gro,uui surface and then <br /> at rive foot intervals until ground water is encountered, All cuttings from <br /> the boreholes will be placed in 55-gallon drums and will remain on site <br /> until the analytical results are received. We anticipate ground water to be <br /> encountered at approximately a f.�et below ground surface. The borings will <br /> ba advanced approximately ten feet into the aquifer. 7fle monitoring wells <br /> will be constructed using 2 inch diameter PVC monitoring casing, the lower <br /> ten feet of which will be factor;( slotted (slot size 0.02 incl%es). The <br /> annular space around the perforated interval will be backfilled with a <br /> coarse sand filter pack. One foot of bentonite will be placed on top of the <br /> sand, and the remaining annular space to ground surface will be backfilled. <br /> with cement grout. A locking ste!_1 vault will be set in each surface seal <br /> to prevent imauthorized accass to the wells. <br /> The monitoring wells will be developed and sampled by California Water Labs <br /> of Modesto using a down-hole positive displacement bladder pump. At least <br /> five well volumes will be removed from each well prior to sampling. A <br /> shallow ground water sample will be obt--,tined from each well and transported <br /> to the lab in a refrigerated container under appropriate chain of cvato:y <br /> documents. The samples will be'arslyzed for volatile organic constituents <br /> using EPA Test Method.601/602 and for gasoline or diesel product. Soil <br /> s-nmp]as will probably not be analyzed urless evidenee of contamination is . . <br /> seem during field oterations. <br /> There is a possibility than the monitoring wells will be adopted into a <br /> monitoring program for the underground tanks. However$ in the-event that <br /> the mc:atoring wells are no longer required, we would.propose that they be <br /> abane,6ned by re-drillirZ the.holes, removing the casings and all <br /> con:itruetion materiais, and grouting Idle holes back to ground surface.using <br /> a tremie-pipe. <br /> We hope this information is adequate for the permit application }process." .If <br /> you have any questions or require additional information please call. We <br /> Would like to perform the field work on.,Wednesday, August 12th, and Mould <br /> greatl7 apprwLiat.e $ray help you can give us in meeting our schedule. <br /> Sincerely <br /> BETA ASSOCIATES <br /> Andrew L. Wright <br /> Project Manager- - <br /> gUav4sc 'ciates <br /> s <br />