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• 13 May 1998 <br /> AGE-NC-95-0144 <br /> Page 4 of 5 <br /> Y <br /> gasoline and diesel (TPH-g, TPH-d), for volatile aromatics (benzene, toluene, ethylbenzene <br /> and xylenes, BTE&X) with methyl tertiary-butyl ether (MTBE) and for oxygenated <br /> compounds in accordance with the EPA Methods 8015m, 8020 and 8260 <br />� r <br /> 9 Monitor auger returns and soil sample duplicates for the presence of volatile organic <br /> compounds using an organic vapor meter equipped with a photo-ionization detector (PID) <br /> pre-calibrated to isobutylene <br /> 10 Log auger returns and soil sample duplicates in accordance with the Unified Soil <br /> Classification System <br /> 1 l Place auger returns on plastic sheeting and place rinseate in 55-gallon DOT drums and store <br /> on-site Disposal alternatives will be evaluated based on results of laboratory analyses <br /> 12 Dual complete the three borings as ground water monitoring wells Five feet of 0 020-inch <br /> slotted PVC screen will be installed from 50 to 45 feet bsg with blank PVC casing extending <br /> to the surface A second section of slotted PVC will be installed from 32 to 12 feet bsg with <br /> blank casing extending to the surface The proposed dual completed monitoring well <br /> construction is illustrated in Figure 3 <br /> 42 MONITORING WELL DEVELOPMF,NT <br /> 1 During monitoring well installation, surge the water in each well using a Surge block of <br /> bailer to settle the sand pack prior to installation of the overlying bentonite plug <br /> 2 During initial ground water monitoring, purge additional water until essentially sediment <br /> free <br /> 43 GROUND WATER SAMPLING <br /> 1 Survey the top of each well casing to the nearest 0 01 foot relative to existing monitoring <br /> wells _ <br /> 2 No sooner than 72 hours after installation, measure to the nearest 0 01 foot, the static water <br /> level in each monitoring well <br /> 3 Using a submersible pump or dedicated bailer, surge and purge each monitoring well At <br /> _ least three well volumes of water will be removed from each well to stabilize temperature <br /> pH, and conductivity, stabilization parameters will be measured at regular intervals during <br /> . purging <br /> Adrauced GeoEnvironmental,inc <br />