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', III IIIIIIIIIIIII III <br />• ~ ~Pc~M, M~Sf <br />`SEO Si,i <br />J' ~ '`f <br />r J <br />z <br />g n"~/1 ~ UNITED STATES ENVIRONMENTAL PROTECTION AGENCY <br />_; g <br />e'ft~~ onO~E` REGION VIII <br />1860 LINCOLN STREET <br />DENVER. COLORADO 80203 <br />MAR 2 11978 <br />Ref: 8EA <br />Mr. J. Paul Storrs <br />Area Mining Supervisor <br />U. S. Geologica] Survey <br />Box 25044, Mail Stop 602 <br />Denver Federal Center <br />Denver, Colorado 80225 <br />Dear Mr. Storrs: <br />We wish to thank you for your recent letter in which you acknowledged <br />our comments on the mining plan submitted by Colorado Westmoreland, Inc. <br />for their proposed Orchard Valley Mine. We also wish to express our <br />appreciation for the close working relationship your office has provided <br />us as the hydrologic issues we raised have been discussed. We especially <br />appreciate the efforts that you and Mr. John Matis have made to examine <br />and evaluate the CWI plan. <br />In response to your request for a summation of our present position <br />regarding recommendations contained in our previous letter, we wish to <br />provide the following in reference to item number 2 of Attachment I to <br />our letter of February 13, 1978. We understand that, at a minimum, four <br />stipulations which address the hydrology of the mine site will accompany <br />any plan approval from your office. These stipulations will address: <br />1. The requirement that the erosional stability of the upper basin <br />drainage area will be routinely assessed, that corrective measures will <br />be employed whereever necessary to ensure stability, and that the diver- <br />sion ditch will not be a permanent feature on the post-mining terrain <br />unless all affected landowners commit to perform all necessary mainte- <br />nance to ensure erosional stability and do so prior to abandonment (re- <br />lease of bond) of the mine. <br />2. The requirement for detailed, site-specific design of aTl areas <br />that discharge to the vegetation buffer strips showing how high flows <br />(in excess of about 0.5 cfs) will be routed away from vegetation buffer <br />and through protected channels to the sedimentation ponds, the nature <br />of vegetation now located in these buffer areas, and the routine in- <br />spections that will be employed to monitor for increased erosion. <br />f"~~~e~:3fiill'iNidi~ d I, <br />