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<br /> <br />2 <br />SedCad calculations from the remaining three areas addressed in the <br />application demonstrate the runoff from these areas resulting from <br />a ten year storm will meet effluent limits in the mine's NPDES <br />permit. These calculations adequately demonstrate that the Apache <br />Canyon airshaft, the East Portal water tanks and the Core House <br />areas meet the requirements of Rule 4.05.2(3) for "small area <br />exemptions". <br />There is one final adequacy concern which needs to be addressed. <br />All approved SAE's need to be clearly identified on a map. The <br />Division suggests that the sediment control maps for the east and <br />west portals be revised to indicate the location of all approved <br />SAE's. This includes containment areas 1 and 2 at the west portal <br />as well as the refuse belt sump north of the highway. If WFC <br />wishes to have the refuse belt sumps south of the highway approved <br />as SAE's (in response to NOV C-91-014), these areas will also need <br />to be identified on the appropriate maps. <br />Review of TR-23 has been delayed due to the prolonged resolution of <br />issues in the OSM's Ten Day Letter X-91-02-370-003. A decision by <br />the Division is due on or before August 22, 1991. In order to <br />allow time for response to the issues above and review of those <br />responses, the Division requests that WFC submit a request for an <br />extension of the decision date. Your prompt response would be <br />appreciated. <br />If you have any questions, please contact me or Joe Dudash at the <br />Division. <br />Sincerely, <br />~ ~~~ ~r~ <br />Larry P. Routten <br />Senior Reclamation Specialist <br />cc: Steve Renner <br />Joe Dudash <br />M:\WP51\LPR81691b <br />