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David Wang, P.E. , Chief <br /> August 12, 1991 <br /> Page 9 <br /> specified within the Draft Final Ground Water <br /> FS. <br /> Draft Final Ground Water FS Volume 2 <br /> 9. Page H-15, last paragraph - In addition to three-dimension <br /> modeling, field testing may be required to evaluate the <br /> feasibility of the connector well (reinjection) scenario. <br /> 10. Appendix K - Did the modeling effort evaluate cumulative <br /> impacts of the emission from the two strippers or were the <br /> strippers treated purely independently? The modeling <br /> indicated that exposure levels of concern were limited to <br /> the immediate vicinity of the mouth of the stripping tower. <br /> The likelihood of worker or residential exposure at that <br /> location should be included, as a mitigating factor. <br /> 11. Appendix L - Responses to the State's ARARs solicitation <br /> were provided to Sharpe in a July 2, 1991, letter. That <br /> information should be included in the Final Ground Water FS. <br /> Risk Assessment Report <br /> 12 . The word "significant" is used frequently within the Risk <br /> Assessment Report. However, no quantification of the word <br /> is offered. For example, does "not significant" mean: (1) <br /> deminimus, (2) no excess cancer risks, or (3) not above <br /> regulatory standards. <br /> 13 . Page 1-2, Paragraph 2, Sentence 2 - The referenced sentence <br /> should be revised to indicate that off-site irrigation wells <br /> have recently shown contamination. How does the detection <br /> of contamination in the irrigation well affect the Risk <br /> Assessment? <br /> 14 . Page 3-4, Last Sentence - The referenced statement should be <br /> clarified. Carbon tetrachloride was not listed as a <br /> compound of interest in Section 1. 2 . 2 , as referenced. <br /> 15. Section 4 .4 . 2 , Last 2 Sentences - Clarification should be <br /> provided on why the mechanics of the water supply system and <br /> the monitoring well concentrations would render the ground <br /> water pathway incomplete. <br /> Tracie Billington, <br /> Associate Waste Management Engineer <br /> Attachment <br />