PERMFILE66251 - Laserfiche WebLink

Home Browse Search

M-95-005/Final Adequacy 12/11/95 page 3 a conveyance structure? If that cross section correctly represents your reclaimed slopes and topsoiling, but the berm is not going to be part of the plan, please modify the drawing and resubmit it. Exhibit G - The 100-year storm runoff information included with this submittal does not clearly explain or state whether the pond/dam is sufficient to contain this size of event. The chart you submitted is the same as the one you submitted in May 1995, and is not in itself explanatory. Using the same types of calculations you submitted previously for the 10-year event, I had to run the figures myself for the runoff volume from the 100-year event. As calculated, the dam is not quite sufficient to contain the worst- case, 100-year event. However, any extra containment capacity from berms or pits created during mining or road construction will help alleviate this shortfall. Be aware that additional sedimentation deposited in the pond may reduce its capacity significantly. The cross section diagrams submitted are not completely clear. One depicts a 5-foot high berm, that is to be constructed, but does not explain if it is separate from or to be added to the existing dam. The other diagram on the page refers to a storage volume of water, though there are no volume figures or other supporting data. It does not denote a location or length measurement for the berm, nor include the volume of water it can hold. There is nothing included stating the size of the watershed area which drains to this point. I am assuming that whatever data, etc., this material refers to goes back to the materials submitted as part of the original application. Exhibit L - There were no revised reclamation costs enclosed. I will contact you later this week with some figures to review. If you have any revisions to your figures, please send them. (These are all based on the proposed plan, and should not affect the technical issues being addressed above. The bond can usually be discussed and agreed upon as the last step of the application.) r;Xhlblt R - Filing abblication with Clerk and Recorder - Please send proof of filing the recent submittals. A signed and dated receipt from them is adequate. Please be reminded that all materials submitted for this 112 application must be submitted in sets of 4 copies, with an additional copy being placed on file at the clerk and recorder. We have extended this application decision date until December 31. 1995. Please ensure that we receive your complete responses before that date, with enough time to review them in order to reach a decision.