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13 . Section 4.2.1.2 , SWMUs 2 and 3 Past Site Activities, page 4-2 <br /> The last bullet in Section 4.2.1.2 explains that excavations have been <br /> completed at the site, and that "no further threat to groundwater <br /> remains. " <br /> In order to substantiate no further threat to groundwater, please cite <br /> the report which documents soil confirmation sampling results and the <br /> attainment of soil cleanup standards at SWMUs 2 and 3 . <br /> 14. Section 4.2 .2.5, SWMU 4 Design Data Collection Plan, page 4-8; and <br /> Appendix C, Final Work Plan for Sampling Biota from SWMU 4. <br /> Both Section 4.2.2.5 and the Introduction section of Appendix C should <br /> indicate if the Final Work Plan for sampling biota from SWMU 4 has been <br /> reviewed and approved by an EPA ecologist/toxicologist (include name and <br /> approval date) . <br /> 15. Table 4-7, SWMU 8 Soil Cleanup Standards <br /> Maximum concentration of dieldrin in soil at SWMU 8 should be 13,500 <br /> ug/L (as shown on Figure 4-6) rather than 2,640 ug/L. In addition, <br /> units for TPH should be mg/kg 'rather than ug/kg. <br /> 16. Section 5.7.3, SWMU 24 Design Data Gap Collection Plan, page 5-25 <br /> Section 5.7.2 explains that if TCE or PCE are detected above soil-gas <br /> cleanup levels, then SVE may be implemented prior to bioventing. Since <br /> SVE is a possibility at -SWMU 24, Section 5.7.3 should include a <br /> contingency data collection plan for SVE, e.g. , an SVE radius-of- <br /> influence test. <br /> 5 <br />