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F <br /> November 30, 1995 <br /> }%r� Page 2 <br /> 2.,2.3 Secondary Source Distribution and Residual Levels <br /> Please note that PHS/EHD did not approve of the discontinuance of vapor extraction <br /> nor concur that additional remediation was not necessary In fact, PHS/EHD indicated <br /> in correspondence dated October 22, 1992 that there was not sufficient evidence to <br /> F indicate that the site was largely remediated and that further soil investigation to define <br /> the extent of soil contamination was necessary prior to the installation and operation of <br /> a final remedial system ' <br /> Section 2 2 3 was modified to more fully reflect the conditions for SVE system <br /> deactivation <br /> 2 4Interim Remediation <br /> Numerous estimates were presented with regards to the amount of hydrocarbons <br /> removed and remaining which were not substantiated with calculations Please provide <br /> in addendum[the]calculations used to ascertain the estimates presented <br /> These calculations are provided in Appendix C , <br /> 2 S Exposure Pathway <br /> The plan stated that the groundwater flow was likely the primary exposure pathway, <br /> however, no information on the use of nearby wells were available Please provide in <br /> . addendum information regarding the construction and use of wells within a 112 mile <br /> radius of the site <br /> A well survey was conducted by EA Engineering, Science, and Technology, Inc in order, <br /> to determine the location of wells withal 112 mile of the site, the survey identified 7 wells <br /> within this vicinity PACIFIC investigated the construction and use of use of these wells <br /> and the results are presented in Appendix D <br /> 3.1 Site Water Quality Goals and Protection Standards <br /> The State Water Resources Control Board has not adopted a resalution formalizing the <br /> creation of a "Water Quality Limited Zone" The State Water Resources Control <br /> Board's Resolution 92-49 was not amended to allow for the creation of a "Water <br /> Quality Limited Zone" Any reference to the San Francisco Regional Water Quality <br /> Control board Order 95-016 is not applicable within a basin that is under the authority <br /> of the Central Valley Regional Water Quality Control Board <br /> Section 3 1 was deleted, and the remaining sections containing references to WQLZs <br /> were revised' <br /> ti <br /> 3201337BICAPRESP <br /> y _ <br /> + 1 <br />