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09/17/2003 09:39 2098325 WRIGHT ENVIRONME ,L PAGE 06 <br /> Weil and Piro lrftttailation Procedures <br /> The vapor Wradion weffs and vapor rnonitor�ng probes will be Installed using hollowatern drilling methods. Ea;h <br /> well or probe will be Installed In a boreho.e to the depth shown, The welts vvtll be installed under approved <br /> PHS EHD permits and the work wilt be supervised by a registered geologfat_ <br /> The Bite has Won logged and the site stratigraphy has been mapped. Sample li#ho(ogic logging will bo <br /> Wormed to verity strata contacts to install the well slots at the desired depth)nl+urval. <br /> The boreholes will be advanavd by drilling to the desired depth with pr"eaned hafiowalem augers, Augers, <br /> sarmplirtp tools end rode will be cleaned after each borehole and price to leavirr4 the site. $CA logging for <br /> ccntact verification wilt use the Unload Sol Clessincation System(USCS) using aspic#-spoon so)I sampler <br /> edvsrreed at tRe deslretl elepttt. A 9ee)e9iai will leg file sell and retain}samples as needed. It a811 sales <br /> are retaln6d, grey will be collected in clean brass I ners Completely driven to completely flil the liners in the earn)iler drive.. <br /> The$oil 66MOO will be taken from the split-spoon, sQ8Wd with Teflon aper or foil,capped with plastlC <br /> ondplugs, 'Cooed onto a C1181M.of-custody form and pw*k of crushed ire for shipment of Me laboratory. <br /> Each wall Or grebe will be conatructed in the appropriate borehole The wells willU40 Schedule go PVC <br /> resin>�ae she►yn, The owing will use ihresdeo fotn#a seed glues will not be;Sed. The casino wlll be cut to the <br /> length and threaded together end layered In#e i e t,allowAtOm augers. The sla#t$d Intervals will use 0 20 slots <br /> machine cut at the fstatory. Qnoe the casing is set,an squarivm sand paok wfll be.placed around the osaairrQ <br /> wrular:pane using the hollOwatem anger all tremis pips. The.sand peck will be' ataQcf to a point about 2-tee t <br /> above the slotted interval. A berrtorilte clay spacer will be placed stop the sand pack and hydrated prior to the <br /> camera grout placement to prevent grout invasion into the sand pack. A cement ground seat will avert bo placed stop <br /> the bontonite Clay and raised to the surface trc n the bottom to the top of each borehole using the <br /> holiewftern sugars as*tremis pipe, <br /> A traf'Ic rated locking well vault box Yell)COMplete each extraction well head and vaporprobe ess. <br /> The engineer r+ will modify the box rag needed to set#1e vapor camptlng pprte,tnagr'rahelix gauges 8rd other eq�,iF.�erlt <br /> as ed for the vapor test and probe rneasut arnenta andlcr for fur&mr vapor VdraclltQr from the wails. <br /> vapor MAractlon M11 and <br /> vapor Probe 8peo{ficolm <br /> Prej. NO.;4,133-3 <br /> slefanos Gasoline Dirttertsions as shover: <br /> Wright Environmental Servide, Inc. 1410 Charter way bate_Sept,2003 <br /> stoctston:CA <br /> T���Y► CAFigura i <br /> _ :.••,jai -.f['AT 'p_..."�'�;� y��:' . <br />