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Comment 2. <br /> RESPONSE: <br /> No response necessary. <br /> Comment 3. <br /> RESPONSE: <br /> No response necessary. <br /> Comment 4. <br /> RESPONSE: <br /> Peabody Coal Company has reviewed the pertinent pages in the Nucla <br /> Permit Revision No. 1 document (pages 7-75 and 7-79 of Tab 7) that <br /> originally provided justification of past monitoring of surface water <br /> sites in Tuttle Draw and the West Return Ditch. Peabody recognizes that <br /> the language used to discuss the justification of past monitoring along <br /> both drainages is confusing. Peabody has revised portions of text on <br /> pages 7-75 and 7-79 to provide a correct explanation for historic <br /> monitoring in Tuttle Draw and the West Return Ditch that has been in <br /> effect since approval of the revised monitoring program was granted (see <br /> Reduction of Monitoring at the Nucla Strip, Peabody Coal Company, <br /> Appendix 7-9, Nucla Permit Revision No. 1) . Finally, Peabody has <br /> revised portions of text in the 1986 Nucla AHR to clarify the historic <br /> monitoring in Tuttle Draw and the West Return Ditch. Those changes can <br /> be found on pages 10 and 15 of the 1986 Nucla AHR. <br /> Comment 5. <br /> RESPONSE: <br /> Peabody Coal Company contracts laboratory services for analyses of water <br /> quality samples through ACZ Laboratory Division in Steamboat Springs , <br /> Colorado. ACZ uses an Inductively Coupled Plasma Spectrophotometer for <br /> silver and chromium analyses . The detection limit for both silver and <br /> chromium using the ICPS instrumentation is 10 ug/l . <br /> The analytical procedures used by ACZ to analyze silver and chromium <br /> with the ICPS instrument - can be found in the 1983 E.P.A. document <br /> "Methods for Chemical Analysis of Water and Wastes" (No. 600/4-79-020) . <br /> 8 <br />