2009-03-11_APPLICATION CORRESPONDENCE - C2009087

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C 200-7 087 Page 1 of 2 /tea ??; l?t!r•?-1i? Kaldenbach, Tom From: John Weinman Oweinman@hydro-environmentalsolutions.com] Sent: Wednesday, March 11, 2009 10:17 AM To: Kaldenbach, Tom; 'Cochran, John N.' Cc: 'Dunfee, Brian P.'; 'Pfannenstiel, Vernon R' Subject: Sage Creek Mine - Drainage and Sediment Control Plan Tom - Thank you for taking the time to talk to John Cochran and me on Monday, 3/9, about the drainage and sediment control plan for the new Sage Creek Mine. As I mentioned, I was looking for some clarification on the use of existing, approved, Seneca II information/materials from the Division. Below is a summary of what we talked about and my understanding of how I should proceed. Pond 004 Pond 004 is located in the southeastern part of the proposed Sage Creek Mine permit area. The pond is an existing, approved, permanent impoundment. The drainage channel network that routes surface runoff to the pond is a series of existing, approved, permanent postmine channels. This pond, the associated drainage channel network and the entire watershed that drains to Pond 004 are being transferred from the Seneca II Mine permit to the new Sage Creek Mine permit. The entire watershed area is being transferred in case the permittee decides at a later date to open a portal and/or expand surface facilities into this drainage. At this time there is no new disturbance planned in the 004 watershed. Consequently, there is no need to submit a "revised" pond capacity evaluation or new channel designs for the Sage Creek Mine drainage and sediment control plan. Tie TR-42 (dated 09/0 SEDCAD4 demonstration evaluates the pond capacity as a permanent postmine impoundment using watershed conditions as of fall 2006. For the Sage Creek Mine submittal, an introduction will be added to the existing, approved, TR-42 SEDCAD Demonstration and, existing, approved, TR- 37 Permanent Impoundment Demonstration, that describes t e esign and as-built history of the impoundment an associa a rainage ne or . If the permittee re-disturbs the 004 watershed a revised pond capacity evaluation (and new drainage network demonstration) will be submitted to the Division. Pond 003 Pond 003 is located in the northeastern part of the proposed Sage Creek Mine permit area. The pond is an existing, approved, permanent impoundment. The impoundment treats runoff from the Seneca II Mine office/shop/warehouse area. A series of diversion ditches routes storm runoff to the pond. This pond, the associated diversion ditches and the entire drainage are being transferred from the Seneca II Mine permit to the new Sage Creek Mine permit. The drainage structures and watershed area are being transferred in case the permittee decides at a later date to utilize the existing office/shop/warehouse facilities to support the new Sage Creek Mine. At this time there is no new or additional disturbance planned in the 003 watershed. Consequently, there is no need to submit a "revised" pond capacity evaluation or new channel designs for the Sage Creek Mine drainage and sediment control plan. The existing, approved, Pond 003 as-built report QTR-37, dated 04/05) and the SEDIMOT modeling (dated 08/86) will be included in the Sage Creek Mine submittal; an intro uc ion will be added that describes the design and as-built history. If the permittee re-disturbs the 003 watershed a revised pond capacity evaluation (and new drainage network demonstration) will be submitted to the Division. Pond 002 Pond 002 (aka Wadge Impoundment) is an existing, approved, permanent impoundment. The drainage channel network that routes surface runoff to the pond is a series of existing, approved, permanent postmine channels. This pond, the associated drainage channel network and the entire watershed that drains to Pond 002 are being transferred from the Seneca II Mine permit to the new Sage Creek Mine permit. The Sage Creek Mine portal and surface facilities will be located in the Pond 002 watershed. Consequently, an updated pond capacity evaluation 3/11/2009