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10 June 1998 AGE-NC Project No 96-0229 Page 4 of 7 33 WELL COMPLETION Three of the proposed four soil borings will be single-completed as 2-inch diameter ground water monitoring wells, one of the four soil borings will be dual-completed as a 2-inch diameter monitonng well A PVC well casing will be cmplaced through the hollow stem of the augers to the bottom of the boring A filter pack (43 Lonestar Lapis Luster sand) will be placed adjacent to a screened interval (0 020 inch screen size) from the bottom of the boring to a point approximately 2 feet above the top of the screen interval An approximate three-foot seal of bentonite chips (annular seal) will be placed above the filter pack and hydrated with clean tap water Monitoring wells will be sealed with neat cement from the top of the bentonite annular seal to approximate surface grade A proposed single- completed ground water monitoring well construction diagram is Included as Figure 3, a proposed dual-completed well construction diagram is Included as Figure 4 The design of each monitoring well may be modified based upon field observations and site conditions Monitoring wells will be developed utilizing a submersible pump no sooner than 48 hours following well completion Water will be purged from each well so that water produced from each well is essentially sediment free Purged ground water will be stored on-site in DOT drums in an area lacking access to the general public Following development activities, each well will be allowed a minium 80 percent of recharge prior to collecting ground water samples Ground water samples will be collected utilizing disposable polyethylene bailers Sufficient ground water sample will be collected from each well to fill three EPA approved 40-m1 VOA vials containing 0 5 ml 18% hydrochloric acid as a preservative and a one-liter amber bottle Ground water sample containers will be labeled with the well designation, date, time, and sampler s initials A reference point will be marked on the top of each well head, and surveyed the to the nearest 0 01- foot to determine the elevation relative to existing wells of known elevation 34 LABORATORY ANALYSIS The PHS-EHD will be given an opportunity to review selected soil samples prior to any laboratory analysis Selected samples will be logged on a chain-of-custody form, placed in a chilled container and transported to a California state-certified laboratory for analysis in cic orddi1GG w,th the following • EPA method 8015M for TPH-g • EPA method 8020 for BTE&X with MTBE • EPA method 8260 for oxygenated compounds Including tertiary butyl ether (TBA), methyl tertiary butyl ether(MTBE), di-isopropyl ether(DIPS),ethyl tertiary butyl ether(ETBE)and Advanced GeoEnviranmenW, Inc