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Philhps 66 Company 3 To co Station#1205 164 0 am4ffiSttyet,l..athroy.CA Februa 19 2002 Plan will be reviewed by the field staff and contractors prior to beginning field operations at the site Task 2—Dual Phase Extraction and Feasibility Testing DPE is planned to last five days, 24 hours a day, and will be conducted using a trailer- mounted DPE system capable of generating flow rates up to 300 cubic feet per minute (cfm) and vacuums of up to 25 inches of mercury (in/Hg) SECOR will connect the DPE system to onsite wells and will extract soil vapor and groundwater simultaneously from the wells A thermal oxidizer will be operating as the effluent stream control method and will be used to treat the extracted soil vapors in accordance with permit conditions established by the local air quality management district The period of extraction from a given well is determined by a decrease in the influent hydrocarbon concentrations as measured in the field using a Flame Ionization Detector (FID) or Photo Ionization Detector (PID) Extracted groundwater will be temporarily stored on-site in a 6,900-gallon Baker Tank (or equivalent) pending disposal at the Tosco refinery in Rodeo, California During operation of the DPE system, SECOR will collect soil vapor samples initially (i e , within two hours of system start-up) and daily thereafter from the influent sample port to the DPE system SECOR will also record field parameters such as extraction flow rates and vacuums, and the radius of influence observed in surrounding wells Soil vapor samples will be submitted to a California state certified laboratory for analysis of total petroleum hydrocarbons as gasoline (TPHg) using Environmental Protection Agency i (EPA) Method 8015 modified, benzene, toluene, ethylbenzene, xylenes (BTEX), and MtBE using EPA Method 8020 Laboratory analytical results of groundwater samples collected during the next quarterly sampling event will be compared to the results of previous sampling events to evaluate the effectiveness of the DPE unit in remediation of the petroleum hydrocarbon-impacted groundwater at the site Task 3 - Technical Report Following completion of the feasibility testing, SECOR will prepare a report summarizing the procedures, field results, and analytical results The report will include an evaluation of current site conditions, including recommendations with regard to the tested remediation technology SCHEDULE SECOR is prepared to initiate a 5-day pilot test beginning March 25, 2002 A report documenting the results of the pilot testing will be submitted to the RWQCB approximately six weeks after the completion of the fieldwork and the next quarterly sampling event File TOSCO\12051MTS11205-5-Day DPE Work Plan doc