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16 January 1997 <br /> AGE-NC Project No 97-0290 <br /> Page 4 of 5 <br /> the appropriate EPA methods Selected soil samples may also undergo analysis for longer- <br /> chain hydrocarbons (motor oil), if necessary <br /> I I Complete at Ieast three soil borings as ground water monitoring wells Each well will be <br /> completed using two-inch diameter PVC casings and 20 feet of 0 02 screen A filter pack(#2 <br /> Lonestar Sand) will be installed in the annular space around the casing A two foot bentonite <br /> plug will be installed over the filter pack and the remaining annular space will be grouted to <br /> the surface with Portland Cement A traffic box will be installed with each well Typical well <br /> design is illustrated on Figure 3 <br /> 12 Cuttings will be stored in properly labeled D O T model 17H 55-gallon drums on-site <br /> pending laboratory analysis and disposal <br /> 13 Rinseate generated dunng drilling activities will be containerized in properly labeled D O T <br /> model 17H 55-gallon drums and stored on-site in an area inaccessible to the general public <br /> 14 Develop new mo_ntoring wells utilizing a submersible pump until water is essentially <br /> sediment free <br /> 15 Survey the top of each well casing to the nearest 11100th of a foot to determine the elevation <br />• relative to a single well <br /> 42 GROUND WATER SAMPLING <br /> Upon completion of installation procedures, ground water samples will be collected from each new <br /> well <br /> 1 No sooner than 48 hours after installation of ground water monitoring wells, measure to the <br /> nearest 0 01 foot, the static water level in the new wells <br /> 2 Using a dedicated bailer or submersible pump, surge and purge all wells At least three well <br /> volumes of water will be removed from each well to stabilize temperature, pH, and <br /> conductivity, stabilization parameters will be measured at one-well volume intervals <br /> 3 Ground water samples will be collected using polyethylene disposable bailers, samples will <br /> be collected in I-liter amber bottles and/or 40-m1 VOA vials preserved with hydrochloric <br /> acid <br /> 4 Label and log water samples on a chain-of-custody form <br /> 5 Store the samples in a chilled container and transport under chain-of-custody procedure to <br /> a state-certified laboratory for analysis Water samples will be analyzed for TPH-g,BTE&X <br />• and MTBE in accordance with EPA methods 503018015m, 8020/602 and 80201602, <br />