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x '�` rs 9`�- �y 9 - q �:r w ,•tee",. _ <br /> � L <br /> NC�i`t,.,-:. , =.;��' <br />_ 2 <br /> k+ <br /> f <br /> le <br /> ed at the <br /> k-� <br /> and screened intervals were detern;ined in the f!ted wiield th a minimum d on data loftl5 feet of <br /> time the wells were drilled. Each well�'as comp <br /> - ddie the eater table witl-=five feet of <br /> 0.020-inch,slotted well screen positioned to si=ated interface. <br /> screen above and at least 10 feet below the <br /> e r Ir augers and a#2115 quartzite <br /> assembled well pipe was installed through was backfilled#2 through the <br /> sand, a size compatible with the well screen slot size, <br /> of <br /> t above the to <br /> M-+ <br /> annulus. The filter p e filter pack,benton to pellets were trd to extend at least two emied to form a 2 0 <br /> the well screen. Abovethen added <br /> to 2.5 feet thick bentonite <br /> to�a cl. Potable ement grout awas then backfilled from tithe top of the <br /> the bentonite. Abe ter was <br /> / was <br /> bentonite seal to grow bu aafiush mounted, se. The pvC teelgprotectiveropcurb box 'Me curb <br /> locking cap and coveredy <br /> box was grouted in place to limit disturbance to the pVC well pipe. <br /> ers after completioning urgeand eachbail <br /> monitoring <br /> tWe <br /> ecllniqueslDeelopl,the �men <br /> At least twenty four ot <br /> contractor developed the <br /> continued until each well piomentdwasclear, <br /> thor used'ghlytsteam cleaned,erinsed with <br /> locations, all downhole equ p revent well cross- <br /> isopropyl alcohol and rinsed with distilled water to p <br /> .contamination. <br /> Groundwater Sampling and Analysis <br /> On September 23, 1991, approximately 72 hours ter thmartitlor ng weredeveloped, <br /> werde <br /> intallegroundwater samples from the three newlysthree <br /> collected. Groundwater was us ed andmoved until om each monitoring e <br /> unt 1 field parame ersoluntil at a <br /> f temperture, pH, <br /> well volumes had been e <br /> ertified <br /> and electrical conductivity were a Oy ed f r BTEXbilized. The I by EPA Method 602,TPHD <br /> hazardous waste laborator} and total <br /> the DHS/LUFT Method (Modified EPA Method 8015), <br /> and TPHG by EHD). <br /> fecal coliform(requested by SJCPHS/ accompanied the groundwater sample <br /> A chain-of-custody record (Appendix B) accom p ro riate container a, the <br /> shipment from selection and preparation of the app P <br /> laboratory, to the sample collection site and back to the laboratory. Each sample <br /> ed <br /> was individually labeled, recorded the field <br /> notebook, imm <br /> and shipped byoverinight co r er to <br /> y sealed inside an insulated shipping <br /> the laboratory- <br /> Groundwater Llevation and Product Thickness ;Measurements product <br /> Prior to sampling, each well was checked for depth to water and free <br /> thickness using an electric water level meter/freetpwellstwereinterface <br /> rveyed to allone <br /> single <br /> t.`.�e wells contained free product. All monitor g roximate elevation above sea <br /> {fixed surface datum on site (later converted to an app Hydraulic gradient <br /> level) in order to create an accurate groundwater elevation yap estabishin�gl <br /> groundwater flow to be in a southerly dig the�irccon of groundwater flow. <br /> across thesite <br /> i data are sumnotably flat mariz d in02 tTable I. <br /> elevation <br /> LLL/SY132.211=3 Itly U <br /> ` 4 <br />