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Sellards 8 Grigg, Inc. <br />2. Screens or debris fins at all openings including the intake inside the Mine, <br />3. A protruding inlet near the roof of the Mine, and <br />4. Location of the outfall at or above the crown of the highway culvert. <br />5. Unless the plug at the existing North Intake Portal can withstand a water surface <br />elevation 4.27-feet higher than recommended by Stover, the calculations reveal this <br />system is inadequate to serve as a backup system in the event that the primary <br />system fails to operate. The addition of a vent and screens is recommended. <br />If you have any questions, please call. Thank you for this opportunity to serve you. <br />Very truly yours, <br />SELLARDS & GRIGG, INC. <br />r°-~~ i~~ <br />Peter L. Nelson, P.E. <br />Senior Project Manager <br />Att. <br />390 Union Boulevard, 303.986.1444 <br />Suite 630 FAX 303.986.0994 <br />Lakewood, Colorado 80228 E-MAIL sandginc@earthlink.net <br />