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Table 2 <br /> i ' Phase II soil excavation (Western portion) <br /> •� Soil Sample Analytical Data <br /> ' Analyte <br /> Location Sample Benzene Toluene Ethyl Xylene TPH Gas PID <br /> Number- (µg/Kg) (µg/Kg) Benzene (µg/Kg) (mg/Kg) Reading <br /> Depth (µg/Kj (ppm) <br /> Bottom 9-17' ND ND ND ND ND 0.0 <br /> Bottom 10-12' 23 27 17 75 ND 197 <br /> Bottom 11-19' ND ND ND, ND ND 14.6 <br /> Sidewall 9-12' ND 3,100 30,000 130,000 2,900 904 <br /> ' Sidewall 10-12' 23 18 220 190 38 22.1 <br /> Sidewall 11-11' 17 28 910 2,000 180 801 <br /> Sidewall 12-15' ND ND 8,800 7,900 880 261 <br /> Sidewall 13-12' ND ND 4,000 4,200 510 568 <br /> Sidewall 14-12' 51 ND 750 1,500 150 563 <br /> Pit Interior 5-12' 1,500 4,300 11,000 36,000 1,300 636 <br /> Pit Interior 6-13' 5,700 6,700 43,000-1.11-13.0. ,000 3,500 1363 <br /> Pit Interior 7-12' 2,600 2,800 30,000 1 47,000 2,300 758 <br /> ' NOTE: ND =Not detected above analytical laboratory detection limit. <br /> 4.3 Additional Soil Investigation <br /> A total of seven potholes were excavated at the site to further define the lateral limits of soil <br /> contamination. Potholes PH-1 and PH-3 were designed to delineate the limits of the phase Il <br /> excavation. One soil sample from each of these two potholes were redesignated as sidewall <br /> samples prior to laboratory analysis and their results are discussed above. Potholes PH-2 and <br /> PH-4 through PH-7 were installed in the field area to the northwest of the former UST location in <br /> order to attempt to further define the limits of contamination. Analytical laboratory data are <br /> presented in Table 3 below along with PID readings obtained at each sample location. <br /> Laboratory data sheets and the chain of custody documents are included in Appendix A. <br /> One soil sample was collected at PH-2 from a depth of 15' bgs. This sample indicatedg asoline <br /> at a Ievel of 1,900 mg/Kg, and benzene below the laboratory detection limit. This pothole was <br /> ' not extended past the 15' depth due to unstable sidewalls. <br /> Soil samples were collected at the depths of 12', 15' and 18' bgs from potholes PH-4 through <br /> ' PH-7. The samples collected from 12' bgs in PH-6 and PH-7 were not analyzed by the <br /> laboratory since field monitoring indicated that no contamination was present at these depths. <br /> Laboratory analyses indicated that each of the 18' samples contained non detectable levels for all <br /> analyzed constituents. <br /> • <br /> ' American Geological Services,Inc. <br /> CA95DI✓-029 <br /> ' 15 <br />