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10 August 2004 AGE-NC Project No 96-0232 Page 4 of 10 L Each preserved sample was logged on a chain-of-custody form, placed In a chilled container and transported to a DHS-certified laboratory for analysis for • TPH-g, TPH-d an TPH-mo by EPA Method 5030/8015X4 and LUFT/EPA Method 8015B," • BTEX by EPA Method 8020, • 1,2-DCA, EDB, TBA, DIPE, ETBE, TAME and MTBE by EPA Method 8260B, and • Semi-volatile organic compounds by EPA Method 8270 25 EQUIPMENT DECONTAMINATION The hollow stem augers and the Geoprobe rods were pressure washed prior to each bore hole advancement Sampling tools and brass sleeves used for sample collection were thoroughly washed with a solution of Alconox, and were thoroughly rinsed with clean tap water prior to each sampling sequence Following drilling activities,rinseate generated from decontaminating the equipment was placed In properly labeled DOT-approved model 17H 55-gallon drums and was stored on-site in an area lacking public access 2 6 MONITORING WELL COMPLETION Soil boring MW-19 was dual-completed as a ground water monitoring well utilizing two separate sets of 2-Inch diameter, schedule 40, blank polyvinylchloride (PVC)well casing and perforated, 2- Inch diameter PVC well casing (0 020-Inch slot) The deepest section of well casing was first Installed by placing the entire well casing assembly through the hollow stem of the augers to the total depth of the boring The augers were then Incrementally raised as No 3 Lonestar Lapis Luster sand (filter pack)was slowly poured down the annulus between the well casing and the Inner wall of the hollow stem auger The filter pack was placed adjacent to the screened casing from the bottom of the boring to a point approximately two feet above the top of the screen, following filter pack placement, a surge block was Inserted Into the well casing and was alternately raised and lowered (surged) repeatedly for approximately 20 minutes Thereafter, 1/4-Inch diameter coated bentonite pellets (Pell Plug TR-30)were slowly poured down the annulus to form a transition seal above the bottom well casing assembly and filter pack, the transition seal was allowed to hydrate for a minimum of 30-minutes before well construction activities continued Following the 30-minute hydration period, the uppermost section of well casing was next Installed by placing the entire well casing assembly through the hollow stem of the augers The augers were then Incrementally raised as filter pack material was slowly poured down the annulus between the well casing and the Inner �<< wall of the hollow stem auger The filter pack was placed adjacent to the screened casing from the Advanced GeoEnvironmental,Inc