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<br /> <br />Letter to R. Gabrielson 2 February 18 1994 <br />have to waive your right to a 30 day decision (obviously, the notifications will take <br />more than 30 days), and you must remove an equal amount of undisturbed ground from some <br />other portion of the permitted acreage (an increase in total permit acreage would <br />require a.permit amendment). Please refer to the attached internal Division memorandum <br />for details. <br />In any cave, the Division will require additional information regarding the proposal <br />to drain the quarry pit at the southeast corner, including: <br />a. Dimensions of the proposed channel - in terms of length, width, depth, and croes- <br />sectional configuration. <br />b. Reclamation considerations - ie the channel going to continue to drain the pit <br />after quarry closure, or will it be back-filled and vegetated? What portion of <br />the channel length will be mined through? <br />c. The Division assumes from the topography and geology information supplied, that <br />the .proposed channel will be cut into bedrock and will be deep enough that it <br />will be able to pass any magnitude storm event non-erosively and without over <br />topping. Please confirm this assumption or provide additional details. <br />d. Regardless of the statements in item "c" above, the Division is concerned with <br />the outlet of any proposed surface water control channels or ditches that are <br />routfed to natural channels. Please provide a demonstration that channel or ditch <br />outlets can pass anticipated flows to natural channels non-erosively, or submit <br />ditch outlet upgrade designs if needed. The channel or ditch outlets should be <br />designed for a 10 year - 24 hour storm event for temporary (life of mine) <br />structures, and for the 100 year - 24 hour event for channels that will remain <br />after reclamation. <br />If you have any questions, please contact me. <br />Sincerely, <br />~ i <br />A11en C. Sorenson <br />Reclamation Specialist <br />ACS/acs <br />enclosure(s) <br />C:~WPSI~WEAVER <br />