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Project No S8100-06-11A <br /> June 29, 1995 <br /> Field Activities <br /> ' Retained a subcontractor, Western Strata Exploration, to drill and construct five <br /> groundwater monitoring wells (MW-4 through MW-8) and one vapor extraction well <br /> (VW-1) The soil borings were advanced to a maximum depth of 23 5 meters (77 feet) <br /> bgs utilizing a truck-mounted drill rig equipped with 254-mm (ten-inch) diameter hollow <br /> stem augers Eighty-eight soil samples were submitted to Excelchem Environmental Labs <br /> (Excelchem), a CaIifomia-certified analytical laboratory, for chemical analysis following <br /> chain-of custody protocol <br />' Developed the wells using a surge block to densify the sand pack prior to placement of <br /> the bentonite seal Subsequent pumping was performed to remove sediment utilizing a <br /> submersible pump <br />' Measured the depth to groundwater and collected groundwater samples from the three <br /> existing groundwater monitoring wells, MW-1 through MW-3, the five new monitoring <br /> wells, MW-4 through MW-8, and the vapor extraction well, VW-1 <br />' Submitted nine groundwater samples to Excelchem for chemical analyses <br /> • Performed a survey of top of casing elevations to within 0 003 meter(0 01 foot) accuracy , f <br /> for all new and existing groundwater monitoring wells within the project area V <br /> 4 <br />