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Mr. Shawn Kelley <br /> Page 4 <br /> December 8, 1999 <br /> the casing will be lowered to the bottom of the borehole, leaving a slotted interval above the occurrence of <br /> groundwater to observe for floating product, The sand pack will be placed to a point about two feet above <br /> the slots. A bentonite seal will be placed atop the sand pack, and a cement grout seal placed atop the <br /> bentonite using a tremie line, filling from the bottom to top of the borehole. Traffic rated wellhead access <br /> box and security device will complete the well. <br /> Monitoring Well Sampling and Development <br /> All monitoringwells will be developed �' <br /> ped to remove the drilling muck; grade the sand pack and provide a <br /> more complete hydraulic connection to the aquifer. A well development log will be kept of the well <br /> volumes removed until the water becomes clear and the amount of sand pumped is minimal. The well will <br /> be allowed to recover for at least 72 hours prior to sampling. The well casing will be surveyed to a known <br /> datum to accurately measure groundwater elevation contours. <br /> Chemical Analvsis <br /> d <br /> Three (3) groundwater samples will be analyzed at a State certified analytical laboratory from the <br /> monitoring wells. These samples will initially be tested for the following: Total Petroleum Hydrocarbons <br /> as Gasoline (TPHG) Diesel (TPHD), Benzene (B). Toluene (T'), Ethyl-benzene (E) and Xylene (X), <br /> Methyl-tert-butylether (MTBE) and fuel Oxygenates, 1.2 Dichloroethane and Ethylene Dibromide using <br /> EPA Methods 3510/8015, 8020, and 8260. Subsequent sampling'of monitoring wells will occur at <br /> quarterly intervals or as required by PHS-EHD. The analyses will be run on a normal turnaround. <br /> REPORTS <br /> A Preliminary Site Assessment Investigation Report will be prepared after Phase One for review by <br /> M&M Builders Supply; this report will then be forwarded to the PHS-EHD once approved The report will <br /> include the field methods, permits, exploratory boring logs, chemical analytical data and report narrative <br /> of site hydrogeology and contaminant distribution, and conclusions and recommendations for Phase Two <br /> site work (groundwater monitoring wells, quarterly sampling). After Phase Two work (if required) all <br /> assessment work will be summarized in a final report, including any recommendations for further work <br /> Quarterly monitoring reports will be prepared after each monitoring well sampling event and forwarded to <br /> PHS-EHD as required <br />