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<br /> <br /> <br />ROCKCASTLE COMPANY R~ C E ~ V E V <br />GRASSY CREEK MINE <br />ADEQUACY RESPONSES <br />TO CMLRD 9/13/91 COMMENTS <br />OCTOBER, 1991 <br />PIT <br />NOV 2 6 1991 <br />Mined Land <br />Reclamation Division <br />1) Please submit the hand-drawn topographry maps, derived 6y ACZ so that we <br />may evaluate the lrydrologic design calculations for Pits S and 6. The map <br />should be submitted in some type of formal format, and it should be <br />certified as being a reasonable approximation of existing topography. A <br />more detailed map is not being required. Hand drawn maps will not be <br />used to assess achievement of approximate original contour. <br />• <br />Resaonse: Neither survey nor aerial photogrammetric documentation <br />is available to map the current configuration of Pits 5 and 6. <br />Postmining drainage designs for these areas are based on a hand- <br />drawn map developed through interpretation of existing surface <br />features, typical slopes, and blending with known contours on the <br />perimeter of disturbance areas. The hand-drawn representation of <br />current Pit 5/6 topography has been inserted into the most current <br />Rockcastle base to develop the Postmining Drainage and Sediment <br />Control Map, (Map R-1) which accompanies these responses. This <br />map includes an appropriate certification noting the source of mapping <br />information. <br /> <br />2) The previous submittals proposed permanent retention of all upland <br />diversion ditches at Pits 5 and 6. Retention of upland diversion ditches is <br />not consistent with the regulations, and does not constitute a maintenance <br />free reclamation configuration. As suc/i, we requested a revised engineering <br />plan for Pits 5 and 6 which plans for elimination of all upland diversion <br />-1- <br />