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Stantec <br /> Interim Remedial Action Plan <br /> Former ARCO Service Station No. 443 <br /> July 10, 2008 <br /> location requirements. The top of the casings of all wells located on-site and off-site will be <br /> surveyed by a California-licensed land surveyor for horizontal and vertical control. The <br /> coordinates will be referenced to a known benchmark according to the North American Datum <br /> of 1983 and the North American Vertical Datum of 1988. <br /> 2.6 Waste Handling and Disposal <br /> All investigation derived waste (IDW), including soil cuttings and purge water from well <br /> installation and development will be stored on-site in Department of Transportation-approved <br /> 55-gallon drums pending the results of laboratory analyses. Analytical results will be used for <br /> waste profiling and disposal. After profiling, IDW will be transported and disposed of at an <br /> appropriate State-certified disposal facility. <br /> 2.7 Interim Response Activities <br /> The scope of work for interim remediation will include the periodic pumping of groundwater from <br /> wells MW-1S, MW-2S, and MW-1D. Groundwater will be pumped approximately once per <br /> month from the above-mentioned wells using a vacuum truck or a submersible groundwater <br /> extraction pump. Water will hauled by a certified hazardous waste hauler for proper disposal. <br /> Interim remediation will continue for approximately 6-12 months. <br /> 2.8 Reporting <br /> A report summarizing the field activities and results will be prepared and submitted to the <br /> SJC/EHD. The report will include tabulated field data, relevant figures, appendices containing <br /> laboratory reports, copies of field notes and data sheets, conclusions, and possible <br /> recommendations for future work. Per AB 2886 requirements, Stantec will electronically upload <br /> the data obtained during this investigation into the Geotracker Database. <br /> 2.9 Scheduling <br /> Stantec is prepared to initiate field activities upon approval of this work plan by the SJC/EHD <br /> and off-site access approval. Stantec anticipates that drilling fieldwork will require <br /> approximately ten to 12 weeks to complete, following the receipt of approved access <br /> agreements from property owners and valid permits from the SJC/EHD. If offsite access is <br /> delayed and onsite scope of work is acceptable to the site's property owner, then the onsite <br /> work will proceed and the offsite delineation work will be completed at a later date. <br /> 5 <br /> 443 IRAP.doc <br />