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APR-05-04 MON 1230 PMELL NELSON SCHRIMP FAX N0, 2 26-9320 <br /> I2/e3/2M 17:11 Fd3 :oo 84 ,.7 P. 12 <br /> JUEINFELDER <br /> B-2.8 Soil Boriug Closure ar.d Cutting Disposal <br /> Soil borirbs are closed immediately aft <br /> ar the collection and logging of soil samples. Closrue is <br /> accomplished by groutiu;the boring with a cemeat/bentonite slurry or as 01hetv.•ise required. <br /> 0611 cuttings will be placed in 55-g211on drums wrapped in plastic of spread kxot.nd the boring <br /> and left on site for disposal by the site owner. if requested, Rle;nfelder can coordinate disposal <br /> of soil and water after analytical results arc available. <br /> f <br /> 13-3 GROTWAVATER WELL INSTALLATION <br /> 9-3.1 ManitoringWell Constr•uctiun <br /> Contraction details for shallow groundwater monitoring wells are as f0)1nws: <br /> • The well casing are 2- or 4-iuch inside diameter, flush threaded joint, schedule 40 PVC <br /> pipe. <br /> • The wells are coosTructcd in S-or 10-inch diameter borhrgs. <br /> • Well screen seotiouse are perforated with 0,010-or 0,020-inch factery-cut slots, <br /> • The wells aro generally screened fon a 5 feet above to IS feet below fust greundwarer. <br /> The sorccn length is reduced if an aquitard with a mirumnm tbiekness of 5 feet is <br /> encountered. If an apparem a"itard is uncow.tered, the well is usually terminated I to 2 <br /> fast into tho aquitard, Effort is utade not to screen across two aquifers. Lf confined <br /> aquifer conditions or high.vadose zone contamination are eucountered;dw we]1 screen is <br /> usually not set abovoF the depth of first cnoountered groundwater. Wells arc usually not <br /> set in areas of suspected significant soil contamination. <br /> • The PVC pipe and end caps a re stea.n cl caned prior to installation. <br /> ■ The annular space between the screen and fire wall of the boring is backfilled with the <br /> approcr-ate clean sand to appmai.natah feet a90Ve The tap of la p2Y_4raT.cd sEC[.an5: <br /> Rased on soil 1095 or a sieve test, modifications may be made regarding the size of sand <br /> to be used. Installation of rhe sand may require that the sand be ttomnried, using clean <br /> water. <br /> 02eeIrRV'BNV/STO:1,44: vecrc=5, ,'.J03 <br /> �ZCe3 Alnnfel.!rr,tee Pose w pi is <br /> t <br />