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z <br /> 4 <br /> State of California licensed surveyor. A copy of the surveyor report is presented with the boring <br /> logs in Appendix C. <br /> Soil cuttings generated during drilling were placed either in 55-gallon drums or on top of, <br /> and covered by, visqueen sheeting. Composite samples of the cuttings were collected for waste <br /> characterization prior to disposal. <br /> Groundwater Monitoring Well Development and Sampling <br /> Wells BC-18, BC-19, and BC-20 were developed on February 10, 1997. Development <br /> i <br /> procedures were conducted by Gregg Drilling and Testing, Inc. and included alternately surging <br /> each well with a 4-inch diameter well block and bailing sediment from the bottom of the well <br /> using a stainless steel bailer. Well development continued until the well was free of sediment, <br /> '1 the water being bailed from the well was relatively clear, and the temperature, pH, specific <br /> conductance (SC) of the purge water had stabilized (three consecutive readings not varying by <br /> more than 10 percent). Well development records, as recorded in the field by the Gregg Drilling <br /> and Testing Inc. technician, are included as part of Appendix C. <br /> Groundwater sampling was conducted at the Site between February 21, 1997 and March 7, <br /> 1997. The sampling procedures included collecting depth-to-water measurements, purging, and <br /> sampling 15 groundwater monitoring wells. A sample of surface water contained in the basin <br /> was also collected. The locations of the monitoring wells are illustrated on Figure 1. <br /> On February 21, 1997, Brown and Caldwell personnel collected water level measurements <br /> in 14 of the 17 existing groundwater monitoring wells in the vicinity of the Site (Wells BC-2 <br /> through BC-5, BC-7, and BC-12 through BC-20). Wells BC-9 through BC-11 were buried and <br /> not accessible for water level measurements or sampling. Extraction well RW-1 was found to be <br /> connected to the groundwater treatment system at the Site and therefore could not be sampled. <br /> Following completion of water level measurements, Brown and Caldwell proceeded to collect <br /> samples from the 14 wells and the surface water contained in the stormwater culvert located <br /> along the central portion of the southern wall of the basin. Except for Wells BC-2 through BC-5, <br /> a minimum of three well volumes of groundwater was purged from each well prior to sample <br /> 1 eyovu9xm9a-i3w.a.a« 3-3 <br />