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FIELD METHODS AND PROCEDURES <br /> 1 0 GROUNDWATER AND LIQUID-PHASE PETROLEUM HYDROCARBON <br /> DEPTH ASSESSMENT <br /> A \\atc r/pttrolLum interfacL probe. Naas used to assess th,, thickness of liquid-phase petroleum hydrocarbons (l PH), <br /> if prtsLnt and a %rater ILLI indicator pias used to mc,astuL ground N%atc,r depth in monitoring iNclis that did not <br /> contain I PH Depth to ground rrattr ,Nas mcasurtd from tht top of tach monitoring «Lll casing `i hL tip of tht <br /> rratcr 1Lvd indicator rias subjLcti',tly anal,,ztd for LPH shLen <br /> 2 0 SUBJECTIVE ANALYSIS OF GROUND WATER <br /> Pnor to purging, a mater sample Nvas collected from the monitoring Nell for subjective analysis The sample VNas <br /> retnevcd by gently lo«enng a clean, disposable bailer to approximately one-half the bailer length past the air/liqwd <br /> interface The bailer was then retrieved and the sample contained within the bailer was examined for floating LPH <br /> and the appearance of a petroleum sheen <br /> 3 0 MONITORING WELL PURGING AND SAMPLING <br /> Monitoring wells were purged using a submersible pump or bailer until pH, temperature, and conductivity of the <br /> purge Nvc:xr baa. stzbilizc6 cTiL am I riL i Ori_IFCL LO 'OL- XtiL_I vOIL-Ls orl`uLLr "c_ acC-1 -ar ovcra ,JrOL L waLL- <br /> removed from the wells was si.orec in 55-gallo-i ba cls wt the site 7711; ba fcls were labcic6 wiLh corres2ordTrir, <br /> monitoring well numbers and the date of purging leer purging, grow iE water levels were allowed to stabilize A <br /> ground water sample was then removed from each of the wells using a disposable bailer If the well was purged <br /> dry, it was allowed to sufficiently recharge and a sample was collected Samples were collected in air-tight vials, <br /> appropriately labeled, and stored m an ice chest from the time of collection through the time of delivery to the <br /> laboratory A chane-of custody form was completed to ensure sample integrity, and document possession of the <br /> sample Ground water samples were transported to the laboratory and analyzed within the EPA-specified holding <br /> times for the requested analyses Purge water will be collected from the storage barrels in a vacuum truck and <br /> transported to an appropriate facility for treatment and/or disposal <br /> ID <br /> 1 RPO 10 809 <br />