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08 February 2007 <br />AGE-NC Project No. 07-1508 <br />Page 4 of 4 <br />the borings will be visually classified by an AGE professional in accordance with the Unified Soil <br />Classification System (USCS). Additionally, soil samples will be field-screened for the presence of <br />volatile organic compounds using an organic vapor meter (OVM), equipped with photo-ionization <br />detector (PID). <br />3.3. GRAB GROUND WATER SAMPLE COLLECTION <br />For the collection of "grab" ground water samples, soil probe borings will be advanced to the top <br />of the ground water table as identified by collection of a saturated soil sample. Once ground water <br />has been encountered, a Geoprobe push-driven water sampling device will be advanced two to three <br />feet into the water bearing zone. <br />Grab ground water samples will be collected using a Geoprobe water sampling assembly fitted with <br />a pre-cleaned one-inch 0.010-inch slotted temporary well screen. Each ground water sample will be <br />extracted by lowering Teflon tubing through the hollow center of the push rods into the screen <br />section. <br />Samples for BTEX, DIPE, ETBE, MTBE, TAME, TBA, EDB, 1,2-DCA, and TPH-g analysis will <br />be collected in laboratory-supplied, 40-ml VOA vials, with out preservative. Samples for TPH-d <br />analysis will be collected in laboratory-supplied one-liter glass containers. The labeled containers <br />will be placed in a chilled container under ice and transported under chain of custody to a DHS- <br />certified laboratory. <br />3.4. 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 />3.5. BORING ABANDONMENT <br />All probe borings will be permanently sealed to prevent vertical migration of potential contaminants. <br />Soil borings shall be abandoned by backfilling with portland cement from the total depth to surface <br />grade. <br />Advanced GeoEnvironmental, Inc.