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f <br /> Vapor extraction is the least expensive option, it can achieve rapid results, and <br /> it will not disrupt the business currently in operation <br /> Based on the results of groundwater samples collected to date, SEACOR's report <br /> did not recommend the installation and operation of a groundwater cleanup system <br /> Time Oil agrees with this recommendation Quarterly monitoring will continue <br /> during site cleanup to assure that hydrocarbon concentrations in groundwater do <br /> not exceed action levels <br /> Selection of Remedial Technology <br /> Vapor extraction is the proposed remedial technology to achieve cleanup of <br /> hydrocarbon-impacted soils beneath the subject site It is estimated that 3 <br /> existing wells (W-1, W-2, and W-4) will be utilized for the proposed vapor <br /> extraction system In addition, horizontal wells may be installed within the <br /> vapor extraction piping trenches to enhance remediation if hydrocarbon-impacted <br /> soils are encountered during system installation Although a radius of influence ' <br /> has not yet been calculated for the existing wells, it is estimated that they <br /> will be sufficient for cleanup of the impacted soils Should it be determined <br /> that additional wells are required, they will be installed at a later date <br /> The proposed system will initially utilize an internal combustion engine for <br /> vapor abatement, however, once vapor concentrations have reduced sufficiently, <br /> carbon will be used Section 3 in the attached report contains a detailed <br /> description of the proposed remediation system Figure 7 contains a schematic <br /> diagram of the system components , while Figure 8 identifies the proposed piping <br /> layout and location of the equipment compound <br /> Upon your approval of the FRP/CAP, appropriate permits will be obtained and the <br /> proposed remediation system will be installed at the subject site If you have <br /> any questions regarding this project, please feel free to phone me at (206) 286- <br /> 4495 If I am unavailable, Kevin Murphy may be able to assist you <br /> Sincerely,"00AAS4s;e'4 A�- i <br /> 10 <br /> 14 <br /> Anastasia E Duarte <br /> Environmental Toxicologist <br /> cc Ms Elizabeth Thayer <br /> California Regional Water Quality Control Board <br /> . aed\sep94\4167 L16 <br />