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Individual well location, Lotus spreadsheets tables, presented in Appendix A (also attached) <br /> calculated for each compound the risk and hazard for both the average and RME concentration. These <br /> tables suggest that arsenic contributes more than 50% of the carcinogenic risk at each well except for <br /> LM30A, where arsenic contributes approximately 23% of the risk. Dieldrin generally is the second- <br /> leading contributor to carcinogenic risks. PCE and TCE are lesser contributors to carcinogenic risks <br /> except at wells LM25A (17%) and LM30A (77%). PCE and TCE contribute 100% of the <br /> carcinogenic risks at wells LM24A, LM3913, LM32A, LM76A, LM88C, and LM10213. <br /> Similarly, arsenic contributes greater than 50% of the total hazard at each of these wells, <br /> except for wells LM25A (35%) and LM30A (20%). PCE, TCE, chlordane, dieldrin, and manganese <br /> are all contributors to the total hazard. Again, if a residential exposure scenario were utilized for these <br /> calculations, all would exhibit a total hazard of greater than one (1.0), and remediation of these <br /> compounds would be required by the NCP. <br /> If you have any questions, please contact me at (415) 744-2392. <br /> Sincerely, <br /> 1 Af <br /> Michael Work <br /> Federal Facilities Cleanup Office (H-9) <br /> Hazardous Waste Management Division <br /> Attachment <br /> cc: (See Distribution List) <br /> 2 <br />