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r� <br /> Tosco Corporation,a subsidiary of Ptulltps petroleum Company 7 <br /> Tosco Station#11193,3202 West Hatnmer Lane,Stockton,CA March 7,2002 <br /> If you have any questions regarding this letter, please call us at (916) 861-0400 <br /> Sincerely, <br /> SECOR International Incorporat <br /> QP4FESSI <br /> EC SEA, <br /> NO C 056399 <br /> Rusty ,enkosky, P <br /> Senior Engineer Exp!i ,k <br /> `N CML �P <br /> q.OF CAL*a�� <br /> Attachments Figure 1 —Site Map <br /> Figure 2 - Soil Vapor Influent Concentration Trends <br /> Figure 3 - Cumulative Estimated Mass Removal <br /> Figure 4 - Estimated Radius of Influence -Test Well VW-1 <br /> Figure 5 - Estimated Radius of Influence -Test Wells VW-1, MW-1R, <br /> & MW-2R <br /> Table 1 - Dual-Phase Extraction Operational Data <br /> Table 2 - Dual-Phase Extraction System Soil Vapor Analytical Data <br /> Table 3 - Dual-Phase Extraction System—Groundwater Analytical <br /> Data Before/After Test <br /> Table 4 - Dual-Phase System Estimated Mass Removal <br /> Attachment A - SJCEHD Letter Dated October 31, 2001 <br /> Attachment B - Certified Laboratory Analytical Reports, Chain-of- <br /> Custody Documentation, and Field Data Sheets <br /> cc Mr Dave Vossler, Gettler-Ryan <br />