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~o'y i • <br />PEABO Y C COMP Y <br />W~rat n Dlv on <br />April 9, 1991 <br />1300 South Yale <br />Flagatetf, Amm~e 86001 <br />(802) 7745253 <br />~~~~~~~~ <br />Mr. Dan Mathews qp4 : ? tcgt <br />Colorado Mined Land Reclamation Division <br />1313 Sherman Street, Room 215 Iblinad sand <br />Denver, Colorado 80203 Reclamation Division <br />RE: Permit C-82-057, Seneca II-W Mine, TR No. 10 <br />Dear Mr. Mathews: <br />Enclosed please fmd three copies of updated information for Technical <br />Revision ('I'R)10 to the Seneca II-W permit. Peabody originally <br />submitted the TR10 application on January 15, 1991. <br />Peabody proposes the following Phase II changes for Pond 006. The <br />emergency spillway elevation of Pond 006 will be lowered to reduce <br />the impounding capacity to less than 20 acre-feet. This will ensure <br />that MSHA criteria are not applicable. A copy of this submittal has <br />been forwazded to the MSHA District 9 Manager for his inspection <br />and review. A copy of the transmittal letter is enclosed. The <br />principal spillway will be modified to increase the active storage <br />capacity to treat the runoff from a proposed increased disturbance <br />azea. The existing 24" CMP spillway will be modified to a drop inlet <br />riser pipe. This modification will allow an increase in disturbance <br />azea within the watershed to a maximum of 363 acres. <br />