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26 May 1998 <br /> AGE-NC Project No 96-0266 <br /> ' Page 4 of 9 <br /> ' EPA methods 8015m and 8020, respectively Six grab water samples and four soil samples were <br /> also analyzed for methyl-tert butyl ether(MTBE),,tertiary butyl alcohol (TBA), di-isopropyl ether <br /> (DIPE),ethyl tertiary butyl ether(ETBE)and tertiary amyl methyl ether(TAME) in accordance with <br /> tEPA method 8260m <br /> 1 32 MONITORING WELL INSTALLATION <br /> 3 2 1 DRILLING AND SAMPLING <br /> ' On 08 and 09 January 1998, soil borings MW-1 through MW-6 were advanced at the site Boring <br /> locations are illustrated on Figure 2 Soil borings were advanced to a depth of 20 feet bsg Drilling <br /> was performed using a truck-mounted CME 75-HT drill rig equipped with continuous flight, eight- <br /> inch, hollow-stem augers The drill rig and two-man crew were supplied by Woodward Drilling of <br /> Rio Vista, California <br /> Samples were collected at five-foot intervals in all borings, using a split tube sampler loaded with <br /> three clean, 2- by 6-inch brass sleeves A 140-pound hammer was used to advance the sampler 18 <br /> inches, the number of blows required to advance the sampler in 6-inch increments was recorded on <br /> the boring logs All sampling equipment was washed in an Alconox solution and rinsed twice with <br /> ' water prior to each sampling run Auger returns were stored on-site on plastic pending laboratory <br /> analysis and disposal at a licenced facility <br /> ' Soil samples were preserved by covering both ends of the brass sleeve with Teflon sheets, capping <br /> and sealing with tape Samples were stored in a chilled container and transported under chain-of- <br /> custody to MAI Selected soil samples were analyzed for TPH-g, BTE&X, MTBE TBA, DIPE, <br /> ETBE and TAME in accordance with EPA Methods 8015m, 8020 and 8260m Two soil samples <br /> were analyzed for total petroleum hydrocarbons quantified as diesel (TPH-d) in accordance with <br /> ' EPA Method 8015m <br /> ' .323 SOIL DESCRIPTION AND LOGGING <br /> Soil was extruded from the second brass sleeve (or the continuous core sampler) and screened for <br /> ' the presence of OV using a PID, PID readings were recorded on boring logs The soil was then <br /> described in accordance with the Unified Soil Classification System (see Boi ing Logs, Appendix <br /> A) <br /> 1 <br /> • <br /> 1 <br />