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be revised as the Division sees this as a permit defect. <br />Please submit revised page of the permit to reflect this <br />change as a minor revision or part of the Technical Revision <br />dealing with surface water issues. <br />Impoundments in General <br />~- / 12. Rule 4.05.9(13) requires all impoundments to be inspected <br />~-'~° ~ quarterly. The Division considers four impoundments to be <br />~~ '~~ r~ present at the Keenesburg site. These are: The shop dugout <br />~' <br />,P ';~; pond, the evaporation pond, the sewage pond and Sediment Pond <br />~Jy ly~~~ 2. Sediment pond 2 is covered under Rule 4.05.6(13). Please <br />submit quarterly inspection reports for these impoundments <br />that are approved by a registered P.E. These inspection <br />reports need to be filed at the mine site, with a copy <br />forwarded to the Division. <br />~ 13. Approved designs for all impoundments are necessary for <br />~=; compliance. The Division currently has updated certified <br />designs for Sediment Pond 2 and the sewage pond. Please <br />~~ provide designs for both the shop dugout pond and evaporation <br />pond. <br />Shoo Dugout Pond <br />~~ ~ 14. For the shop dugout pond, conflicting information exists for <br />,~ the drainage area. Please justify the acreage drained to the <br />~' dugout area. <br />15. Two options have been discussed and are addressed below. <br />a. Dugout Pond as Temporary Impoundment <br />1) Please submit designs for the dugout pond in a fashion <br />similar to the adequacy review made for Sediment Pond 2 <br />for Technical Revision No.26, in 6/92. The design event <br />currently in the permit is for the 10 year/24 hour event <br />and needs to be for the 25 year/24 hour event. <br />2) In addition, this option needs to include storage <br />capacity for sediment load in the design calculations. <br />3) Since continued sediment load will compromise the design <br />capacity for the pond, a plan for sediment cleanout needs <br />also to be submitted. <br />/ V o ,-f'~r fb. Dugout Pond as Permanent Impoundment <br />1) If this option is chosen, please submit "Permanent <br />Impoundment" supporting documentation and calculations <br />per Rule 4.05.9(1) in addition to the 25 year/24 hour <br />event request. <br />