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accordance with the Unified Soil Classifica ion System. Samples will be obtained <br /> using a split-spoon sampler loaded with three pre-cleaned brass tubes. <br /> S) Complete B11 as a 2-inch groundwater monitoring well (MW-11). Boring B12 will <br /> t, be completed with two wells, an extraction well (MW-12A) and an air sparging well <br /> (MW-12B). The well designs are illustrated in Figures 3 and 4, respectively. Boring <br /> B13 will be backfilled to the surface with cement. <br /> 6) Decontaminate sampling equipment in an alc nox solution and rinse twice with water <br /> prior to each sampling run. <br /> 7) Preserve soil samples in the lead brass tube by covering bothends with aluminum <br /> sheets, capping and sealing with tape. <br /> 8) Label and log soil samples on a chain of custody form. <br /> 9) Store the samples under ice and transport the samples in a chilled container to a <br /> State certified laboratory for analysis. Selected soil samples will be analyzed for total <br /> petroleum hydrocarbons (TPH as gasoline) and volatile aromatics (BTE&X) in <br /> accordance with EPA methods 8015m and 8020, respectively. <br />?El," <br /> 10) Monitor auger returns and soil sample duplicates for the presence of volatile organics <br /> using a photo-ionization detector (PID) pre- alibrated to isobutylene. <br /> f, <br /> 11) Place auger returns on plastic sheeting and store on-site pending analytical results of <br /> r' soil samples. <br /> 6.2 Groundwater Monitoring <br /> Following the drilling and sampling, monitoring wells within the hydrocarbon plume (based <br /> t upon existing data) will be purged and sampled. The following procedures will be <br /> performed: <br /> r- <br />;,, 1) Measure the static water level in all wells, re ative to the top of the well.casing, to <br /> the nearest 0.01 foot; this task will be performed no sooner than 72 hours after the <br /> k <br /> installation of the new wells. <br /> 2) Calculate the hydraulic gradient and the grot ndwater flow direction using the field <br /> r data. <br /> h .. <br /> 3) Prior to the start-up of the IAS pilot test, grou dwater samples will be collected from <br /> monitoring wells MW-2, MW-6 and MW-11 ( )roposed). Each well will be purged of <br /> standing water to stabilize pH, temperature a d conductivity. A single water sample <br /> r will then be collected using a new, disposabl plastic bailer for each well. <br /> t� <br /> G-bS-I A.d�t_-j. 4 <br /> IO4.9-94jL"MERt%gLL.E WFj <br /> r <br /> a�, <br />