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Tosco Corporation,a subsidiary of Phillips Petroleum Company 7 <br /> Tosco Station#1205,16470 Cambridge Street,Lathrop,CA June 26,2002 <br /> CONCLUSIONS AND RECOMMEDIATIONS � <br /> Based on the data collected during the DPE tests, DPE is capable of removing high <br /> concentration of hydrocarbons from soil and groundwater beneath the site However, <br /> further definition of the dissolved petroleum hydrocarbon plume will be needed prior to <br /> the selection of a remedial alternative for the site <br /> SECOR recommends that site assessments activities currently ongoing be completed <br /> Once site assessment actives are complete a Problem Assessment Report (PAR) should <br /> be prepared Based upon the projected assessment schedule the PAR should be submitted <br /> in November 2002 <br /> If you have any questions regarding this letter, please call us at (916) 861-0400 <br /> Sincerely, <br /> SECOR International Inco e <br /> �oQRaF�ss�a�� <br /> `r NO C 058399 rn <br /> Rusty Benkosky, <br /> Senior EngineerCML <br /> "k EXP/2 oZ <br /> o1F CA1.1�OQ�\P <br /> • <br /> Attachments Figure 1 - Site Map <br /> Figure 2 - Cumulative Estimated Mass Removal <br /> Figure 3 - Estimated Radius of Influence—MW-6 <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 Extraction System—Fuel Oxygenates Analytical <br /> Data Before/After Test <br /> Table 5 - Dual-Phase System Estimated Mass Removal <br /> Attachment A - SJCEHD Letter Dated February 26, 2002 <br /> Attachment B - Certified Laboratory Analytical Reports, Chain-of- <br /> Custody Documentation, and Field Data Sheets <br /> cc Mr Michael Infuma, San Joaquin County Environmental Health Department <br /> Mr Marty Hartzell, RWQCB <br />