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24 May 2001 <br /> • <br /> I AGE-NC Project No 96-0254 <br /> Page 2 of 4 <br /> was containerized In properly labeled DOT-approved 55-gallon drums and was stored on-site The <br /> soil bonngs were backfilled over their entire depth range with a portland cement grout mix <br /> I <br /> 22 GROUND WATER SAMPLE COLLECTION <br /> Following advancement of an initial boring to collect lrthologic data,the CPT drill ng equipped with <br /> a HydroPunch ground water sampling tool was utilized to collect grab ground water samples from <br /> specified depths in a twinned soil boring advanced near the original boring The HydroPunch sample <br /> tool was pushed into the specified zone, then withdrawn approximately four feet to expose an inlet <br /> screen The interior of the sampling tool filled with water and a 0 5-inch outer diameter (O D ) <br /> I stainless steel bailer was lowered and utilized to extract a ground water sample Ground water <br /> samples were collected from selected depth intervals (zone) based on previously acquired <br /> CPT-lithology data indicating favorable conditions for sampling ground water The twinned soil <br /> borings were backfilled over their entire depth with a portland cement grout mix <br /> Following sample collection, the samples were placed in laboratory-supplied containers, labeled and <br />' were transported under chain-of custody to McCampbell Analytical Inc (MAI), a California <br /> Department of Health Services (DHS)-certified laboratory Samples were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) in <br /> accordance with EPA Methods 5030/8015 and 3550/8015 modified, <br /> • Benzene, toluene, ethylbenzene and total xylenes (BTEX) and methyl tertiary-butyl ether <br /> (MTBE) in accordance with EPA Method 8020, and <br /> • Fuel oxygenates - MTBE, di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), <br /> tertiary-amyl methyl ether (TAME) and tertiary butanol (TBA) in accordance with EPA <br /> Method 8260M <br /> 3.0 FINDINGS <br /> Soil descriptions were utilized to construct the vertical and lateral geologic model, laboratory <br /> analysis of ground water samples was utilized to assess the hydrocarbon-impact on the ground water <br /> media <br /> Advanced GeoEnvironmental,Inc- <br />