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J Birds Mine — Stormwater Comments <br />Page 3 <br />December 6, 2011 <br />designs for both the Upper and Lower Ponds to include an appropriately designed <br />granular filter and fully lined riprap spillway. <br />6. Spillway Cross Section Design — The lateral section on Drawing 3 (Lower Pond Details) <br />shows a one -foot high vertical section at the outside edge of the spillway section. This <br />vertical slope is not sustainable using earthen materials for construction. Please clarify <br />what material is to be used to maintain this profile or revise the lateral section to show a <br />side slope of 2H:1 V or flatter. <br />If either you or the applicants have any questions regarding the comments above, please call me <br />at (303) 866 -3567, extension 8169. <br />m :4ninktclIm- 2005-050 jbirds\stormwatercomments mem06decl1.docx <br />