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7 <br /> 2 INVESTIGATIVE METHODS <br /> Five soil boreholes were drilled and converted to monitoring wells from March 15 to <br />' 18, 1994 Soil samples were collected from the boreholes as they were drilled <br /> Groundwater samples were collected from the wells on March 23 and 24, 1994 Samples <br />' were submitted to three laboratories for a variety of tests, including chemical, physical, and <br /> microbiological analysis Well heads were surveyed for vertical and horizontal control on <br />' April 8, 1994 A detailed description of these investigative tasks is provided below <br />' 2.1 Soil Boreholes <br />' Five boreholes, MW-9 through MW-13, were drilled by the state C-57 licensed, <br />' BSK & Associates of Pleasanton, California These boreholes were drilled to assess <br /> subsurface lithology, collect soil samples, and provide for monitoring well installation <br /> Geologic borehole logs are included in Appendix A <br /> Boreholes were drilled to a depth of 75 feet with a Mobile B-53 hollow-stem auger <br />' (HSA), truck-mounted, drill rig Boreholes MW-9, MW-11, and MW-12, subsequently <br /> converted to 4-inch wells, were drilled with 10-inch (outside) diameter HSAs Boreholes <br />' MW-10 and MW-13, subsequently converted to 2-inch wells, were drilled with 8-inch <br /> diameter HSAs <br />' Soil cuttings produced by the drilling were either drummed or were stockpiled on and <br /> covered by plastic sheeting As of April 20, 1994, the soil cuttings are temporarily stored at <br />' the facility pending arrangements for proper disposal <br />' 2.2 Soil Sampling and Laboratory Analysis <br /> IBoreholes were sampled at either 5- or 10-foot intervals using a split-spoon sampler <br /> Soil sampling, handling, and quality assurance/quality control procedures are further <br /> described in Appendix B <br /> I <br /> 04/94/121382/125997/STOCKREP REP/1 <br />