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1 <br /> 1 Over the life of theroJ ect, dissolved contaminants declined to below method detection limits <br /> P <br /> ' in wells MW-1 through MW-6 Dissolved contaminant concentrations were below method <br /> detection limits in wells MW-1, MW-3 and MW-4 for at least the four most recent, <br /> consecutive sampling events Dissolved contaminant concentrations were below method <br /> detection limits in wells MW-2, MW-5 and MW-6 for at least the four most recent sampling <br /> events, the last three were consecutive <br /> 4.0 EXISTING CONDITIONS <br /> 1 4.1 Soil Conditions <br /> The site is currently unoccupied Soils beneath the site are fine grained, consisting of mostly <br /> ' clayey and sandy silt <br /> In order to characterize the condition of the soil at the site and determine a mass volume of <br /> ' residual hydrocarbons remaining in the soil at the site, Smith Environmental completed drilling <br /> of seven confirmation soil borings between September 27 and October 2, 1995 (Figure 2) <br /> The borings (CB-1 to CB-7) were drilled by Spectrum Exploration, Inc of Stockton, <br /> California using 6-inch O D hollow-stem augers, and completed to depths ranging from 46 5 <br /> ft bgs to 75 ft bgs Descriptions of the material encountered and FID readings are presenter) <br /> on the stratigraphic logs in Appendix A <br /> ' The rationale for the boring locations is listed below <br /> ' o Soil borings CB-2, CB-6 and CB-7 were located in the immediate vicinity of the former <br /> gasoline UST, adjacent to soil borings B-1, B-2 (MW-1), B-3 (MW-2), B-5, B-15 <br /> 1 (VEW-2), and B-16 (VEW-3) These locations were chosen due to the elevated <br /> concentrations of petroleum hydrocarbons previously detected in the samples collected <br /> ' from these borings These confirmation bonngs were completed to depths of 70 5, <br /> 61 5 and 61 5 feet bgs, respectively <br /> o Soil boring CB-5 was located adjacent to boring B-17 (VEW-4) and completed to a <br /> depth of 51 5 feet bgs 1n order to determine the radius of influence of the VES and <br /> extent of hydrocarbons, if any, north of the former UST Previously, low levels of <br /> n 10540061reportslCLO1195 doc 9 <br /> 1 <br /> - SMTH <br />