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11 February 1998 <br /> • AGE-NC-95-0103 <br /> Page 3 of 4 <br /> 1 Notify the PHS-EHD at least 48 hours prior to the commencement of any work <br /> 2 Advance four soil borings using a truck-mounted drill ng equipped with eight-inch, hollow- <br /> stem augers The borings for the installation of the ground water monitoring well and IAS <br /> well shall be advanced to a depth of approximately 30 feet below surface grade (bsg) Soil <br /> borings to determine the vertical extent of hydrocarbon-impacted soil will be advanced to <br /> a minimum depth of 35 feet bsg and may be advanced to greater depths based on field <br /> indications and measurements <br /> 3 Complete one soil boring as a ground water monitoring well using 20 feet of 0 020-slotted <br /> 2-inch diameter PVC casing A sand filter pack Ail] be installed to a depth of two feet above <br /> the screen interval and a bentonite plug will be placed two feet above the sand pack Sea] the <br /> well with portland cement to the surface and complete the well with a ti affic rated well box <br /> a Complete an additional soil boring as an IAS well using 5 feet of 0 020-slotted 2-inch <br /> diameter PVC casing, from a depth of 30 to 25 feet bsg A sand filter pack will be installed <br /> to a depth of 2 feet abme the screen interval and a bentonite plug will be placed 10 feet <br /> above the sand pack Seal the well with portland cement to the sui face and complete the well <br /> with a traffic rated well box <br /> . 5 Collect soil samples at 5-foot intervals in each boring Soil sa3npIcs will be logged in <br /> accordance with the Unified Soil Classification System Soil sample duplicates will be <br /> screened for the presence of organic vapor using an organic vapor meter equipped with <br /> photo-ionization detector (PID Thermo Environmental 580A, calibrated to isobutylene) <br /> 6 Collect and preserve soil samples in brass sleeves by covering both ends of each sleeve with <br /> Teflon or aluminum sheets, capping and sealing with tape <br /> 7 Decontaminate sampling equipment in an Alconox solution and rinse with water prior to <br /> each sampling run <br /> 8 Label and log samples on a chain-of-custody form Store samples in a chilled container and <br /> transport to a state-certified laboratory Selected soil samples will be analyzed for TPH-g, <br /> BTE&X, MTBE, TBA, DIPS, ETBE and TAME <br /> 9 Backfill the additional soil borings with portland cement to the surface, in accordance with <br /> the PHS-EHD well standard 13 17 8 <br /> 10 Connect the new IAS well through the subsurface piping network to the compressed air <br /> source <br /> 11 Place auger returns in DOT-approved drums and store on-site pending analytical results of <br /> soil samples - <br /> • 12 Rinseate generated during drilling activities will be containerized in properly labeled D 0 T <br />