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4 <br /> Tosco Marketing Company two, October 29 2001 <br /> Tosco jFormer BP #11193 $202 West Hammer lane Stockton CA <br /> Section 5192). The Health and Safety Plan will be reviewed by the field staff and <br /> contractors prior to beginning field operations at the site. <br /> Task 2—Dual Phase Extraction and Feasibility Testing <br /> DPE is planned to last five days and will be conducted using a trailer-mounted DPE <br /> system capable of generating flow rates up to 300 cubic feet per minute (cfm) and <br /> vacuums up to 25 inches of mercury (in/Hg). SECOR will connect the DPE system to <br /> &AW Ze t wells MW-2R and VW-1 and will extract soil vapor and liquid simultaneously from the <br /> W10--30 <br /> wells. A thermal oxidizer will be used to treat extracted soil vapors in accordance with <br /> "V-1 permit conditions established by the local air quality management district. The period of <br /> �g> 19-20' extraction from a given well is determined by a decrease in the influent hydrocarbon <br /> concentrations as measured in the field using a Flame Ionization Detector (FID) or Photo <br /> Ionization Detector (PID). Extracted groundwater will be temporarily stored on-site in a <br /> Baker Tank (or equivalent) pending disposal at the Tosco refinery in Rodeo, California. <br /> During operation of the DPE system, SECOR will collect soil vapor samples initially <br /> (i.e., within two hours of system start-up) and periodically thereafter from the influent <br /> sample port to the DPE system. SECOR will also record field parameters such as <br /> extraction flow rates and vacuums, and the radius of influence observed in surrounding <br /> wells. Soil vapor samples will be submitted to a California state certified laboratory for <br /> analysis of total petroleum hydrocarbons as gasoline (TPHg) using Environmental <br /> Protection Agency (EPA)Method 8015 modified, benzene, toluene, ethylbenzene, <br /> xylenes (BTEX), and MtBE using EPA Method 8020. Laboratory analytical results of <br /> groundwater samples collected during the next quarterly sampling event will be <br /> compared to the results of previous sampling events to evaluate the effectiveness of the <br /> DPE unit in remediation of petroleum hydrocarbon-impacted groundwater at the site. <br /> Task 3 - Technical Report <br /> Following completion of the feasibility testing, SECOR will prepare a report <br /> summarizing the procedures, field results, and analytical results. The report will include <br /> an evaluation of current site conditions, including recommendations with regard to the <br /> tested remediation technology. <br /> SCHEDULE <br /> SECOR is prepared to initiate a 5-day pilot test beginning November 26, 2001. A report <br /> documenting the results of the feasibility testing will be submitted approximately six <br /> weeks after the completion of the fieldwork. <br /> TOSCO 11193/pilottest-dualphase <br />