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21 January 2004 <br /> AGE-NC Project No. 95-0135 <br /> Page 7 of 7 <br /> A second soil boring will be located no more than three feet from the first CPT boring for ground <br /> water sample collection. Based on CPT findings,a groundwater sample will be collected based on <br /> significant lithologic variation. Grab ground water samples will be collected from within 2-inch <br /> diameter hollow-stem rods equipped with a four-foot,extendable 0.01-inch slotted PVC screen.Grab <br /> ground water samples will be collected in selected intervals of saturated porous and permeable <br /> material. The screen will be exposed at the selected depths and a stainless steel bailer will be used <br /> to retrieve the water samples.Ground water samples for appropriate EPA analyses will be collected <br /> into 40-m1 volatile organic analysis(VOA)vials containing 0.5 ml of hydrochloric acid as a sample <br /> preservative. <br /> After collection, the samples will be appropriately labeled and placed on ice and kept in a cooler <br /> until delivered to the laboratory for analysis. Chain-of-custody protocols will be used to document <br /> sample custody transfer from the field to the analytical laboratory. A chain-of-custody form will <br /> accompany the samples. <br /> The proposed soil boring location is illustrated in Figure 2. Following borehole advancement, <br /> portland cement (grout mix) will be utilized to backfill the borehole from total depth utilizing a <br /> down-hole tremie pipe. The EHD will be given a 48-hour inspection notice to inspect the grout mix <br /> and backfilling activities. <br /> 4.2. EQUIPMENT DECONTAMINATION <br /> All sampling tools used for sample collection will be thoroughly rinsed with clean water after being <br /> washed with a solution of Alconox.All down-hole drilling and sampling equipment will be pressure <br /> washed prior to starting each boring. <br /> Advanced GeoEnviron mental,Inc. <br />