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Project No 58100-06-11B <br /> April 19, 1996 <br /> ' 22 Field Activities <br /> o Hand-augered to approximately 1 5 meters (5 feet) bgs at each boring location to aid in clearing <br /> potential underground utilities <br /> 0 Advanced one soil boring (SB-3) within the former pump island to a maximum depth of <br /> approximately 6 1 meters(20 feet)bgs <br /> o Advanced five borings to a maximum depth of approximately 24 4 meters (80 feet) and installed <br /> 101 6-mm (4-mch) diameter groundwater monitoring wells (MW-9 through MW-12) and one <br /> vapor extraction well(VW-2) <br /> 0 Surged the vapor well and monitoring wells using a surge block to densify the sand pack prior to <br />' placement of the bentonite sea] <br /> o Submitted soil samples to Sparger for testing of TPHg and TPHd following EPA Test Method <br /> 1 8015 modified, and BTEX following EPA Test Method 8020 Selected soil samples from each <br /> boring were further tested for methyl-tert-butyl-ether(MTBE) <br /> o Developed the new groundwater monitoring wells and vapor well using an electric pump to <br /> withdraw groundwater and remove sediment that may have infiltrated the wells during <br /> construction <br />' 0 Measured the depths to groundwater in all twelve monitoring wells and two vapor wells utilizing <br /> an electronic water level meter <br />' 0 Submitted groundwater samples to Sparger for testing of TPHg and TPI-Id following EPA Test <br /> Method 8015 modified, and BTEX and MTBE following EPA Test Method 8020 <br /> o Surveyed the top of casing elevations for the new groundwater monitoring wells within the project <br /> boundaries relative to casing elevation(s)for the existing monitoring wells <br />' 4 <br />