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Atlantic Richfield Company 3 <br /> ARCO 4932, 16 East Harding Way,Stockton CA December 14 2000 <br /> by a decrease in the influent hydrocarbon concentrations as measured in the field using <br /> . a Flame Ionization Detector(FID) or Photo Ionization Detector(PID) If generated, <br /> extracted groundwater will be temporarily stored on-site in a Baker Tank pending <br /> characterization and disposal at an ARCO approved facility <br /> Wells that have contained free product, sheen,or high dissolved hydrocarbon <br /> concentrations (and/or other wells in the vicinity of the interpreted source area) will be <br /> targeted for extraction The specific wells identified at this site include wells SVE-1 <br /> and MW-3 The location of these wells is shown on the attached Figure 2 <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, and <br /> xylenes (BTEX) using EPA Method 8020, and fuel oxygenates by EPA Method 8260 <br />' ...... Laboratory analytical results of groundwater samples collected during the next quarterly <br /> sampling event will be compared to the results of previous sampling events to evaluate <br /> the effectiveness of the DPE unit in remediation of petroleum hydrocarbon impacted <br /> 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 would <br /> include evaluation, including recommendations, with regard to the tested remediation <br /> technologies <br /> SCHEDULE <br /> SECOR is prepared to initiate field work immediately following approval of this work <br /> plan and issuance of the air permit by the San Joaquin County Valley Air Pollution <br /> Control District A report documenting the results of the feasibility testing would be <br /> submitted to the SJCDEH, approximately six to eight weeks after the completion of the <br /> field work <br /> 077 43030 150lptlottest-dualphase <br />