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1 � , <br /> in July and December 2003, ATC conducted additional subsurfdLe Investigation a4tivitle5 at the <br /> site that included cone penetration testing, advancing a soil boring (SB8), and installation of <br /> monitoring wells MW4 through MW7 Petroleum hydrocarbons were detected in soil samples <br /> collected from the boreholes of MW5 and MW6, and in the groundwater samples collected from <br /> MW4 through T'VIW-7 Groundwater chemical analyses for MW 1 through MW7 are shown on <br /> Table 2 <br /> 2.0 METHODS AND PROCEDURES <br /> To evaluate the extent of impacted groundwater at the site, a total of five soil borings were <br /> advanced both on and offsite All field activities were performed in accordance with ATC's <br /> Workplan to Further Assess the Up-Gradient, Down-Gradient, and Cioss-Gradient Ertent of <br /> Petroleum Hydrocarbons at Eggzman, Andrew, and Edith Trust Propel ry Located at 111? East <br /> Harding Way, Stockton, California, dated September 21, 2005 This workplan was prepared in <br /> response to correspondence received from the EHD dated May 25, 2005 <br /> 2.1 Drilling Activities <br /> On November 17 and 18, 2005, an ATC geologist supervised the advancement of two soil w <br /> borings, SB9 and SB10 The borings were advanced on the property to the southwest and <br /> northeast of the former tank pat at the site for the purposes of evaluating the horizontal extent of <br /> petroleum impacted soil and groundwater A site plan with soil bonng locations is shown on <br /> Figure 2 <br /> Woodward Drilling Company, California License C57 710079, advanced the borings using a <br /> truck mounted Geoprobe(ED narrow diameter rig employing direct push technology SB9 and <br /> SB10 were advanced to approximately 50 to 55 feet bgs <br /> Soil samples were continuously collected from borings SB9 and SB 10 in acetate sampling tubes <br /> and were described according to the Unified Soil Classification System Soil samples were field <br /> screened with a Photo Ionization Detector (PID), and two soil samples from each of the borings <br /> were subnutted for laboratory analyses Soil sample selection for laboratory analyses was based <br /> on PID measurements and field observations (i a odor and soil discoloration) Descriptions of <br /> soil types encountered and sample collection intervals are presented on the boring logs contained <br /> in Appendix A <br /> On December 5 and 28, 2005, an ATC geologist supervised the advancement of three soil <br /> borings, SB I 1 through SB 13, to depths of approximately 50 to 56 5 feet bgs Woodward Drilling <br /> advanced the borings utilizing a hollow stem auger drill ng <br /> Soil samples were collected from the borings at five-foot intervals in stainless steel sampling <br /> tubes The cored samples and dnll cuttings were characterized for soil type, moisture content, <br />• <br /> SIEnvironnental'224931reportsLSUMIV doc 3 <br />