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Wendy L. Cohen - 2 - 18 February 1999 <br /> b. To ensure that the target remedial concentration of 150 ug/l is fully protective of human health, <br /> this value should be put back into the health risk equations and the Lifetime Excess Cancer Risk <br /> (LECR) re-calculated. If the LECR is 10-5 or less, then the target remedial concentration is <br /> acceptable. <br /> 5. Section 6.2 states that the frequency and scope of reports will be described in the Remedial Action <br /> Plan (RAP). However, LFR needs to also describe the frequency and scope of reports that will be <br /> submitted before the RAP is finalized. LFR should realize that its schedule for the RAP assumes <br /> that the health risk assessment will be reviewed, revised, and approved within one to two months. <br /> This is extremely optimistic; LFR should allow 6 to 8 months for final approval of the risk <br /> assessment. Therefore, I believe that soil vapor extraction will begin before the RAP is finalized. <br /> 6. LFR proposes to install an additional 27 soil vapor extraction wells and 12 SVE monitoring wells. <br /> The rationale for determining the number of soil vapor extraction wells is acceptable; however, the <br /> work plan should also provide some rationale as to how the location and number of S VE monitoring <br /> wells were determined. <br /> 7. Figure 35 (the schedule) is missing from the document. <br /> 8. Sections 8.6 and 8.7 describe in general terms the sampling and reporting that is proposed. A more <br /> formal sampling and reporting plan should be presented. <br /> WSW <br />