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~ACZ ACZ Inc. Engineering end Environmental Services 1475 Pine Grove Road, Suite 109 P.O. Box 774018 Steamboat Springs, Colorado 80477 303-879-6260 July 29, 1992 Ms. Catherine W. Begej Mined Land Reclamation Division 1313 Sherman Street, Room 215 Denver, Colorado 80203 iii iiiiiiiiiiiu iii sss RECEIVED fJUL 311992 DIVISIUw yr MINERALS & GEO:.O~;Y Re: Minor Revision Request No. 20 Responses, Southfield Mine, Permit No. C-81-014 Dear Ms. Begej: Following are responses co your July 21, 1992 letter regarding the South Mine Fan Installation. uestion 1 First, the modifica[ion of the drainage azea above the cut material stockpile does not make sense to me. Page 200 Rb of Exhibit 19 specifically says that the containment berm is not considered in the capacity calculation. Therefore, I see that there is a contributing drainage from the west and sou[hwes[ of 0.63 acres rather [han 0.07. I believe [his would modify your length and slope assumptions also. Response Southfield intends to construct a catchment basin completely around the cut material stockpile to contain any runoff from the stockpile. During construction of the catchment basin, a berm will placed on the outside of the basin. This berm will intercept and divert any undisturbed run-off from the west and southwest preventing it from entering the catchment basin. The [ex[ on pages 200 Ra, 200 Rb, page 10 of the supplement, and Map 30 have been revised [o clarify the catchment basin and berm configuration. uestion 2 Second, I find the references to containment ditches found on pages 200 Ra of Exhibit 19 and page 10 of the TR-20 supplement to Exhibit 15 to misrepresent the situation at the site. I believe that you are lying to install paired diversion berms and catchment basins. Please modify the narrative to clarify this distinction. Response The reference "containment ditches" has been changed to catchment basins on page 200 Ra and page 10 of the supplement to clarify this distinction.