Laserfiche WebLink
i <br /> 09 April 2003 <br /> . AGE-NC Project No. 98-0450 <br /> Page 4 of 4 <br /> 4.1. PROBE BORING ADVANCEMENT <br /> Probe borings will be advanced using a van-mounted Geoprobe 5400 direct-push probing unit <br /> equipped with 1.25-inch probing rods.The Geoprobe advances soil probe borings using a hydraulic <br /> hammer to drive soil sampling tools to specified depths. <br /> 4.1.1. Grab Ground Water Sampling Procedures <br /> For the collection of`grab' ground water samples, selected probe borings will first be advanced to <br /> a depth of four feet below the ground water surface (approximately 45 or 50 feet bsg). The grab <br /> ground water samples will be collected using a Geoprobe water sampling assembly with a wire- <br /> wound steel screen or a pre-cleaned one-inch diameter, 0.01 slotted screen. Each ground water <br /> sample will be extracted by lowering a Teflon bailer through the hollow center of the push rods into <br /> the screened section. Samples will be collected in laboratory-supplied,40-m1 VOA vials containing <br /> 0.5-m1 of hydrochloric acid as sample preservative and one-liter bottles. The labeled vials will be <br /> placed in a chilled container under ice and transported under chain-of-custody to a DHS-certified <br /> laboratory. <br /> • 4.1.2. 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 /> i <br /> 4.1.3. 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 GeoEnvironmental,Inc. <br />