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BOO COAL COMPANY L.P. <br />L 573 ate Highway 13 <br />Meeker, Colorado 81641 <br />(970)824-1573 <br />(970) 824-1598 FAX <br />Juan P. Garcia <br />Senior Mining Engineer <br />~_~III IIIIIIIIIIIII III t <br />Cofoa~yuCoalComPonyL.~ . <br />November 18. 1998 <br />Byron Walker <br />Environmental Protection Specialist <br />Colorado Division of Minerals and Geology <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />RE~E~~ED <br />Nt71 1 ~ 1998 <br />RE: Technical Revision 41 (TR-41), Permit C-81-019f)rw~onvt M'°e2~s&Geo <br />Sediment Pond Remodel, Additional Information in Response to DMG <br />Letter Dated June 12, 1998 <br />Dear Byron: <br />Enclosed, please find revised text, SEDCAD runs, and additional information in <br />response to your above mentioned letter. This additional information continues <br />Colowyo's intent to change the designs of all ten (10) of Colowyo's sedimentation <br />impoundments from containment to treatment pond systems. <br />Comments regarding the specific Items listed in your letter are as follows. <br />Items 1 thru 7: Appropriate changes and additions have been made to the permit <br />text. Revised pages are included with this submittal. <br />Item 8: Riprap and riprap specifications have not been incorporated onto the <br />Proposed Plan Maps. Upon final approval of this TR, Colowyo will implement <br />the modifications to the principal spillways and then will generate new <br />final As-Built maps which will then replace the current Proposed Plans. <br />Additionally, supporting designs are provided indicating the riprap <br />specifications for all pond emergency spillways. <br />Item 9: Elevations of the upstream toe of the embankments will not be put onto the <br />Proposed Pond Maps or the As-Built Maps. For this information, please refer <br />to the CTLIThompson stability evaluation report (Item 10). <br />Item 10: Refer to the CTUThompson stability evaluation report. <br />Item 11: Appropriate corrections have been made to Table 5. <br />Item 12: SEDCAD analysis' have been certified. <br />