Laserfiche WebLink
15 February 2005 <br /> AGE-NC Project No. 02-0950 <br /> Page 7 of 7 <br /> 4.5. IN-SITU GROUND WATER SAMPLING PROCEDURES <br /> For the collection of grab ground water samples, soil borings will be advanced to the top of the <br /> ground water table as identified by collection of a saturated soil sample.Once ground water has been <br /> encountered,a Geoprobe.push-driven water sampling device will be advanced two to three feet into <br /> the water-bearing zone. Grab ground :water samples will'be collected using a Geoprobe water <br /> sampling assembly fitted with a pre-cleaned one-inch diameter-0.010-inch slotted temporary well <br /> screen. Each ground water sample will be.extracted by lowering a.polyethylene bailer through the <br /> hollow center of the push rods into-the screen section. Samples for TPH-g, BTEX, and fuel . <br /> oxygenate analyses will be collected into laboratory-supplied, 40-m1 VOA vials containing 0.5 ml <br /> of 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 /> 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 for analysis. <br /> 4.6. 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 CPT and Geoprobe rods will be cleaned prior to . <br /> advancement at each boring location.., - <br /> 4.7. BORING ABANDONMENT <br /> All borings will be permanently sealed to prevent vertical migration of potential contaminants. Soil <br /> borings shall be abandoned by backfilling with portland cement from the total depth to surface grade. <br /> Advanced GeoEnvironmental,Inc. <br />