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I <br /> Atlantic Richfield Company(ARCO) 7 <br /> ARCO Station #4932 16 E Harding Way Stockton,CA January 15 2002 <br /> Extracted groundwater samples will be collected during and following the pump test <br /> Samples will also be collected from the holding tank upon completion of the feasibility <br /> test for profiling and disposal purposes The water samples will be submitted to a <br /> California-certified laboratory for the analysis of TPHd and TPHg by EPA Method 8015, <br /> BTEX by EPA Method 8020, and fuel oxygenates by EPA Method 8260A <br /> Field and Laboratory procedures are included as Attachment C <br /> WORK PLAN FOR INTERIM REMEDIATION <br /> The objective of interim remediation at this site is to reduce the concentration of MtBE in <br /> groundwater around the northern pump island at the site Interim remediation will be <br /> accomplished by periodically pumping wells MW-4, SV-1, and the proposed groundwater <br /> extraction well using a vacuum truck as discussed below <br /> • Groundwater Extraction. Interim groundwater remediation will include the <br /> periodic pumping of groundwater from wells MW-4, SV-1, and the proposed <br /> groundwater extraction well Groundwater will be pumped once a month at the <br /> site using a vacuum truck while a permanent remedial system is being designed <br /> and installed Water will be hauled by a certified hazardous waste hauler to <br /> Seaport Environmental in Redwood City, California for disposal <br /> . SCHEDULE <br /> Proposed project schedules are included as Figures 5 and 6 Please note that the <br /> permitting and installation of onsite remedial and monitoring wells will begin <br /> immediately following approval of this work plan Once the remedial well is installed, <br /> aquifer testing will be conducted and a Remedial Action Plan (RAP) will be prepared <br /> Additionally while the RAP is being prepared, plans for a permanent remedial system will <br /> be initiated <br /> If there are any questions regarding the contents of this work plan or response letter, <br /> please call us at (916) 861-0400 <br /> Sincerely, <br /> SECOR International Incorporated <br /> Clinton Harms <br /> Project Scientist Co ti4-.iu0`, <br /> a NO.6065 <br /> John ower,RG N� Q, <br /> Principal Geologist 9pFCALIF�Q�` <br /> WKPLAN4932—1 11 02 doe <br />