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! I <br /> I <br /> I <br /> 06 April 2009 <br /> AGE-NC Project No. 02-0962 <br /> Page 4 of 4 <br /> I <br /> 3.2. SOIL-GAS SAMPLING LEAK DETECTION <br /> AGE proposes to utilize 70% isopropyl alcohol (rubbing alcohol) as a leak detection tracer '. <br /> compound to ensure that a reliable soil-gas sample is collected from each soil boring with no <br /> ambient air breakthrough down the probe rod. AGE will apply an appropriate amount of rubbing <br /> alcohol (approximately 8 ounces) to adequately wet a cotton towel; the wetted towel will be <br /> completely wrapped around the base of the probe rod where it contacts the surface and the bentonite <br /> seal. Thereafter,a soil-gas sample will be collected as described in Section 3.1. <br /> Utilization of isopropyl alcohol as a leak detection method was referenced in Technical and <br /> Regulatory Guidance, Vapor Intrusion Pathway:A Practical Guideline,prepared by the Interstate <br /> Technology&Regulatory Council(January 2007). <br /> 3.3. EQUIPMENT DECONTAMINATION <br /> All sampling tools used for sample collection will be thoroughly rinsed with clean water after being <br /> washed with a solution of Alconox.All down-hole drilling and sampling equipment will be pressure <br /> washed prior to starting the boring. All rinseate generated during drilling activities will be <br /> containerized in properly labeled DOT-approved 55-gallon drums,and was stored on-site in an area <br /> lacking public access. <br /> 3.4. BOILING ABANDONMENT <br /> Following collection of soil-gas vapor samples,each bo-ehole will be filled to the ground surface <br /> with a Portland type H cement grout.The grout mixture w ll consist ofType I/II portland neat cement <br /> and not more than 6 gallons of water per 94-pound sackof cement.The SJCEHD will be given the <br /> opportunity to inspect the grout mix prior to backfilling activities. <br /> Advanced GeoEnvironmental,Inc. <br />