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' Stockton Plating Inc. <br /> Soil & Groundwater Investigation <br /> April 19, 1994 <br /> Page - 5 - <br /> 4.0 FIELD INVESTIGATION <br /> 4.1 Drilling <br />! On February 9t' and 101, 1994, three ( 3) monitor wells were <br />' installed at SPI (Figure 2) . Prior to the field work, monitor <br /> well construction permits were obtained from SJCEHD. The monitor <br />' wells were installed by Spectrum Exploration, Inc . , of Stockton, <br /> California, (C57 license #512268) under the supervision of a <br /> Condor geologist. Harlin Knoll of SJCEHD was on site <br />' periodically to observe the drilling. <br />' The well borings were drilled with 10-inch Q.D. hollow-stem, <br /> continuous-flight augers . The augers were steam cleaned prior to <br /> drilling each well. The steam-cleaning effluent was collected in <br /> 55-gallon drums, sealed, labeled and left on site. Soil samples <br /> Iwere collected with a California-modified, split-spoon sampler <br /> fitted with three (3) clean brass liners . During sampling, the <br /> split-spoon was driven ahead of the auger. The bottom most liner <br /> was prepared for shipment to the laboratory and the uppermost <br /> liner was discarded. The remaining liner was used for geologic <br /> logging and for field screening. <br /> IThe 3 monitor wells were drilled to o total depth of <br />' approximately 60 feet below ground surface. Soil samples were <br /> collected at 5-foot intervals from the ground surface to a depth <br /> of 60 feet in MWl and a depth of 45 feet in MW2 and MW3 . The <br /> CONDOR <br />