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Geological Teclatics Inc. Page 7 <br /> Sinclair Trucking <br /> Feasibility Study Addendum <br /> Project No. 1030.3 <br /> April 26,2004 <br /> ' <br /> 3.0 PROPOSED REMEDIAL METHOD <br /> ' From the data presented above, we conclude that the in situ remediation approach is the <br /> preferred method. We made this decision for the following reasons: <br /> I. Soil Vapor Extraction is not a viable option due to site-specific conditions. <br /> ' 2. Excavation is a more expensive approach and due to site-specific conditions can run into <br /> complications and cost overruns at groundwater. <br /> 3. It is possible to reach the desired goal of 90% destruction of the contaminants with the <br /> ' in situ procedure. GTI has used this method at a Modesto site and has seen excellent <br /> results in a ten-week period. <br /> Given these conclusions, we recommend that the APT in situ advanced oxidation <br /> ' remediation process be used to mitigate the elevated levels of BTEX constituents and <br /> gasoline at this site and provide the protection needed for public health and the <br /> environment. Our goal is to have this site under remediation by August 2004 and have the <br /> ' site closed by summer 2005. <br /> ' 4.0 SCHEDULE & REPORTING <br /> Geological Technics Inc. anticipates beginning fieldwork no later than 45 days after work <br /> plan approval and cost pre-approval by the USTCFP. The infonnation gathered during this <br /> phase of work will be presented in a report, which will include a summary of the geology as <br /> well as the results of sample analyses. Dr. Ray Kablanow, a registered professional <br /> geologist, will supervise the project. Copies of the report will be forwarded to the <br /> ' appropriate County and State regulatory agencies (SJCIPHS EHD and CRWQCB). <br /> 5.0 SIGNATURES & CERTIFICATION <br /> Geological Technics Inc. will perform this project in accordance with accepted geologic and <br /> hydrologic standards of the State of California accepted and in effect at the time of this <br /> ' investigation. Geological Technics Inc. is not responsible for undisclosed conditions. <br /> This feasibility study was prepared by: <br /> ' y OkES510k4 <br /> Eric L. Price �oQa �c�o <br /> Geologist 4 <br /> - <br /> _: Ra.KABlAPiOW tl <br /> UJ v+ <br /> Raynold 1. ablanow II, Ph,D. <br /> R.G#5234, CHG #442 SOF CAv* <br /> 1 <br />