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. The augers and sampling equipment were steam cleaned prior to drilling the boring and the sampling equipment was washed with a TSP solution and rinsed in clean water between each sampling interval PRESERVATION OF SOIL SAMPLES The ends of the brass sleeves containing the soil samples were sealed with a teflon film and further protected with plastic caps Each sleeve was labeled with site name, date, time, sample location, and analyses to be performed Each labeled soil sample was placed in a separate zip lock bag, deposited in and ice chest, and cooled to 4° C The soil samples and accompanying chain of custody documentation were delivered to North State Environmental Analytical Laboratory (NSE), DHS# 1753, on March 27, 1998 COLLECTION OF GROUNDWATER SAMPLES FROM TH1 Two groundwater samples were collected during the drilling of TH1 using "hydropunch" techniques The water samples were collected from the two foot screened interval of the hydropunch tool at the depths of 33-35 feet bgs and 43-45 feet bgs The auger and bit were advanced to three feet above the top of the desired sampling interval at which point a hydropunch tip and screen was inserted through the hollow stem auger at the end of a hollow rod and driven five feet into the formation at the base of the test hole The covering of the screened interval of the hydropunch tool was then retracted two feet to allow groundwater to enter the tool Groundwater samples were collected from the screened tip of the hydropunch tool with a mini bailer through the hollow rod The water samples were decanted into 4 VOA vials with no airspace and preserved with 0 5 ml of HCL The water samples were labeled and preserved as described above for the soil samples Groundwater inside the hollow stem auger had risen to approximately 15' bgs at the time of the first hydropunch water sample collection at 33-35 feet bgs Groundwater inside the hollow stem auger was measured at 25 feet bgs when the second hydropunch water sample was collected at 43-45 feet bgs This suggests that the clay and silt drill cuttings generated between 25 and 40 feet bgs partially sealed off further entry of groundwater into the borehole after its initial entry when the boring was advanced to 25 feet bgs CERTIFIED LABORATORY ANALYSES OF SOIL AND GROUNDWATER SAMPLES NSE analyzed the four soil samples and two groundwater samples for concentrations of Total Petroleum Hydrocarbons as Gasoline (TPH-G) using EPA method 8015 modified and BTEX (Benzene, Toluene, Ethylbenzene, and Xylenes) and MTBE (Methyl Tert-Butyl Ether) using EPA method 8020 NSE also analyzed both groundwater samples and soil sample TH1-25 5' (exhibiting highest TPH-G concentration) for concentrations of the oxygenants TBA, MTBE, DIPS, ETBE, and TAME using EPA method 8260 DESTRUCTION OF TH1 DISPOSITION OF CUTTINGS AND RINSATES Following soil and groundwater collection, Woodward Drilling Co grouted the soil boring TH1 to surface by tremae with neat cement and < 5% bentonite The displaced groundwater in the boring was captured before it reached the surface and pumped into two 55-gallon DOT approved drums . The approximately one half cubic yard of soil cuttings generated by the drilling of TH1 were stored on a base and under a covering of 6-mil visquine in a fenced compound at the rear of the site 3 SANCHEZ SRPT 5/11198