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• 08 June 199$ AGE-NC Project No 95-0173 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 2-Inch diameter monitoring wells A PVC well casing will be emplaced through the hollow stem of the augers to the bottom of the boring The filter pack (#3 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 foot 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 mor+roring«yell const-_,ction di,n am +s ,n^1t,1-_d as IF-- 3, , -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 each well is essentially sediment free Purged ground water will be stored on-site in DOT drums in an area inaccessible to the gene]a] . 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 to the nearest 0 01-foot by a licensed surveying engineer to determine the elevation relative to a surveyed benchmark 34 LABORATORY ANALYSIS The PHS-EHD will be given an opportunity to review selected soil samples prior to any laboratory analysis Each ground water sample will be logged on a chain-of-custody form, placed in a chilled container and trwri$"vrted to a California citotn-ncrf, a a IoL.�wnt�r.r r 1.r�,n nnnnrrlo„nn :.'1th k/ -we ceA Liffle%{ 1LlV ViLLLVl) 1Vl L111L11�"J10 ILL LLL,�Vt4µa14L+ the following • EPA method 8015M for TPH-g and TPH-d • EPA method 8020 for BTE&X with MTBE • EPA method 8260 for oxygenated compounds including methanol, ethanol, tertiary butyl • ether (TBA), methyl tertiary butyl ether (MTBE), di-isopropyl ether (DIPS), ethyl tertiary Advanced GeoEnvirorunent9l, Inc