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<br />"permanent pool" due to the different spillway elevations (two feet rather than three <br />feet). If the water level in the pond was lowered one foot below the principal <br />spillway, theoretically, the spillways will safely pass the 10-year event. <br />Two issues need to be addressed; <br />a. Colowyo must demonstrate how water will be safely removed from all ponds <br />that rely on storage to control runoff, and be in compliance with the State <br />Engineer's Regulations requiring release of water in excess of 2 acre-feet <br />within 36-hours. <br />b. Colowyo must demonstrate that the Taylor Creek Sediment Pond will safely <br />pass the 10-yeaz, 24-hour storm event if there is a "permanent pool" of water <br />in the pond. Colowyo could address this issue by either, lowering or <br />perforating the riser to drop the water level or marking the maximum storage <br />elevation on the riser. <br />3. On revised page 4.05.6, Colowyo states that pumping of pits due to collection of <br />surface runoff is anticipated only on a extremely rare occasion, and will not effect the <br />design or function of the sedimentation ponds. Please estimate the quantity of water <br />that will be pumped into the sediment pond at any given time. Please verify that the <br />pond will still be adequately sized to contain or treat the 10-year, 24-hour <br />precipitation event when pit water is being pumped. <br />4. Please identify the use of trash racks as nonclogging dewatering devices as defined <br />in Rule 4.05.6(3)(c). <br />The Division's decision due date is January 1, 1996. Please respond prior to this date, or <br />grant the Division a decision extension. If you have any questions, please do not hesitate <br />to call. <br />Sincerely, <br />~, <br />~~ V <br />Erica S. Crosby <br />Environmental Protection Specialist <br />c:\wp51\colowyo\951214 <br />