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Michael work <br /> Page 2 <br /> January 23 , 1998 <br /> 8. 16.6.5.2: in addition to SWMUs 2 and 4, SWMU 3 is also identified as posing ecological risks <br /> in¶5.6.2 and Table 5-26, but it is not discussed here. <br /> 9. 17.2.6.7: delete potential. <br /> 10. ¶7.7.2: SWMU IOA: economically infeasible? <br /> 11. re SWMU 4: ¶9.7.1.10: please revise to clarify that reference is to total excavation; since <br /> selected remedy is limited excavation, paragraph as written is confusing and appears to <br /> undermine selection of remedy. <br /> 12. re SWMU 4: ¶9.7.1.14: how does monitoring these contaminants evaluate the effectiveness <br /> of the remedy if the remedy is based on cleanup standards for different contaminants? Is <br /> DDJC-Tracy actually monitoring to evaluate the effectiveness of the remedy for SWMU 4 or for <br /> some other reason, e.g., to ensure that there is no risk to human health? <br /> 13. re SWMU 7: ¶8.6.9: please clarify how groundwater monitoring will ensure that <br /> institutional controls are protective of the environment (for example, that trigger levels will <br /> identify when reevaluation of the selected alternative is necessary); egg DDRW-Tracy response to <br /> ORC comment#30, dated October 15, 1997. <br /> 14. re SWMU 20: ¶9.7.5.10 and 11: SVE criteria need to be consistent with other sites, e.g., <br /> Sacramento Army Depot. <br /> 15. re SWMU 24: 18.9.2: meaning of "biased high" is unclear; please include reference to <br /> potential risk to future depot worker(sge T¶6.5.9 and 9.7.6.2); HI says 10 but Tables 5-17 and 6-5 <br /> say >1, respectively; please make consistent. <br /> 16. re SWMU 24: ¶9.7.6.2: refers to toluene risk, but Table 5-17 refers to manganese; please <br /> make consistent; text says HI is 0.7, but Tables 5-17 and 6-5 say>1 and 10, respectively. <br /> 17. re SWMU 27: 18.10.2: meaning of"biased high" is unclear. <br /> 18. re SWMU 27: ¶9.7.7.2: reference to future depot worker seems incorrect --Table 6-6 <br /> contains cancer risk for construction worker(see also¶6.5.7). <br /> 19. re Northern Depot Area: 18.12.9: reference to future construction worker is not supported by <br /> Table 6-5, which discusses risk only for grader operator. <br /> B-2 <br />