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27 December 1999 <br /> AGE-NC Project No. 99-0683 <br /> Page 6 of 6 <br /> 4.1 .2. Grab Ground Water Sampling Procedures <br /> For the collection of`grab' ground water samples, selected probe borings will be advanced to a depth <br /> Of four feet below the ground water surface. The grab ground water samples will be collected using <br /> a Geoprobe water sampling assembly with a wire-wound steel screen or a pre-cleaned one-inch <br /> diameter, 0.01 slotted screen. Each ground water sample will be extracted by lowering a Teflon <br /> bailer through the hollow center of the push rods into the screened section. Samples will be collected <br /> in laboratory-supplied,40-m1 VOA vials containing 0.5 ml hydrochloric acid as sample preservative <br /> and 1-liter amber bottles. The labeled vials will be placed in a chilled container under ice and <br /> transported under chain-of-custody to a DHS-certified laboratory. <br /> 4.1.3. Equipment Decontamination <br /> Prior to use, all sampling tools used for sample collection will be thoroughly rinsed with clean water <br /> after being washed with a solution of Alconox. All probing rods will be cleaned prior to <br /> advancement at each probe boring location. <br /> 4.1.4. Boring Abandonment <br /> All probe borings will be permanently sealed to prevent vertical migration of contaminants. Soil <br /> borings shall be abandoned by backfilling with portland from the total depth to surface grade. <br /> Advanced GeoEn ironmental,Inc. <br />