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i <br /> 11 February 2003 <br /> AGE-NC Project No. 98-0520 , <br /> ' Page 7 of 7 <br /> 1 4.3. 1N-SITU GROUND WATER SAMPLING PROCEDURES <br /> For the collection of grab ground water samples; soil probe borings will be advanced to the top of <br /> ' the ground water table as identified by collection of a saturated soil sample. Once ground water has <br /> been encountered,a Geoprobe push-driven water sampling device will be advanced two to three feet <br /> into the water-bearing zone. Grab ground water samples will be collected using a Geoprobe water <br /> 1 sampling assembly fitted with a pre-cleaned,one-inch diameter 0.01-slotted temporary well screen. <br /> Each ground water sample will be extracted by lowering a polyethylene bailer through the hollow <br /> center of the push rods into the screen section. Samples for` TPH-g, BTEX, and fuel oxygenate <br /> ' analyses will be collected into laboratory-supplied, 40-m1 VOA vials containing 0.5-m1 of <br /> hydrochloric acid as sample preservative. Samples for TPH-d analysis will be collected into <br /> laboratory-supplied, 1 liter amber bottles without sample preservative. <br /> 1' Appropriately sealed and labeled samples will be placed in a chilled container under ice and <br /> transported under chain-of-custody procedure to a DHS-certified laboratory.Each sample container <br /> ' will be labeled with the boring designation, time, date and sampler's initials. <br /> 4.4. 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 /> ' 4.5. 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 /> 1 Advanced CeoEnvironmental,Inc. <br /> 1 <br />