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it <br /> Tosco Corporation,a subsidiary of Phillips Petroleum Company 5 <br /> Tosco Station#11192 1403 Country Club Lane,Stockton,CA Febru., lat02 <br /> SUMMARY OF FINDINGS <br /> On December 3`d through December 7`h, 2001, SECOR performed DPE event at the site <br /> The results of the DPE event are as follows <br /> • DPE was conducted at vapor extraction flow rates ranging between 10 90 cfm <br /> to 22 57 cfm, and at vacuums of 25 inches of mercury <br /> • Groundwater extraction flow rates ranged from 0 5 gpm to 9 0 gpm <br /> • MtBE groundwater concentrations significantly declined in wells MW-3 and <br /> MW-7 <br /> • During the DPE event approximately 0 01 pounds of benzene and 7 5 pounds <br /> of MTBE were extracted from the soil and groundwater beneath the site <br /> CONCLUSIONS <br /> Based on the data collected during the DPE tests, DPE is not an effective remedial <br /> alternative for this site <br /> If you have any questions regarding this letter, please call us at (916) 861-0400 <br /> Sincerely, <br /> SECOR International Inco r FESSI <br /> ��Q�y�E Bfry,S.o lF2 <br /> J w NO C 058399 <br /> Rusty enkosk E Exp1 <br /> Senior Engine `PTq CMl <br /> ���cAt�Fa�' <br /> Attachments Figure 1 - Site <br /> Figure 2 - Soil Vapor Influent Concentration Trends <br /> Figure 3 - Cumulative Estimated Mass Removal <br /> Figure 4 - Estimated Radius of Influence - Test Well MW-7 <br /> Figure 5 - Estimated Radius of Influence - Test Well MW-3 <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 -- Certified Laboratory Analytical Reports, Chain-of- <br /> Custody Documentation, and Field Data Sheets <br /> cc Mr Doug Lee, Gettler-Ryan <br /> • <br />