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i' <br /> Geological TeckiucsInc. <br /> Page 6 <br /> City of Escalon <br /> Project No.. 750.2 <br /> May 16,2005 <br /> Figure 4: North to South Lithological Cross-Section (B-B') — showing subsurface features <br /> and lithology. <br /> Figure 5: Groundwater Elevation Contour(February 16, 2005) <br /> Figure 6: Rose Diagram — showing historical groundwater elevations, gradients and <br /> bearings. <br /> L3.3 Tabulated Groundwater Elevations, Gradient and Bearing <br /> Historical groundwater elevations, gradients and bearings are summarized on Table 1 of <br /> Appendix A. The average groundwater bearing is N73°W with an average gradient of 0.0019 <br /> ft/ft. <br /> Verticalroundwater calculations are summarized on Table 2 of Appendix A_ Vertical <br /> g pp <br /> gradients are historically negative and approximately one order of magnitude less than the <br /> horizontal gradients. <br /> 3.4 Tabulated Analytical Data <br /> Table 3: Summary of Soil Analytical Data from Tank and Trench Samples <br /> . Table 4: Summary of Soil Analytical Data—Soil Borings and Monitoring Wells <br /> L Table 5: Summary of Historical Groundwater Analytical Data <br /> Table 6: Summary of Historical Groundwater.Parameters <br /> [ Table 7: Mass Balance Calculations (2001) <br /> L Table 8: Mass Balance Calculations (2005) <br /> Table 9: Summary of TPH-G Removed by Internal Combustion System <br /> Table 10: Summary of TPH-G Removed by Soil Vapor Extraction& Carbon Filtration <br /> 3.5 Contamination Contours and Cross-Sections <br /> t <br /> Figure 7: Site Map with Soil Excavation <br /> Figure 8: Soil Contamination Contour (TPH-G) showing Lines of Section used in Soil <br /> Plume Cross-Sections <br /> Figure 9: Soil Plume (TPH-G) Cross-Section C-C' <br /> 3.6 Contaminant Mass Estimate Calculations <br /> 2001 Mass Estimate <br /> A preliminary contaminant mass estimate calculation was performed and submitted in GTIs: <br /> Revised Corrective Action Plan — Vadose Zone Remediation dated February 26, 2001. The <br /> February 2001 report estimated approximately 1,600 gallons of TPH-G was present in the <br /> soil at the site (Table 7). These calculations were very liberal using thickness of 25-feet to <br /> calculate mass. October 2003 soil investigation activities suggest the heaviest contaminated <br /> ' zone is likely 15-feet thick. <br /> i <br />