Laserfiche WebLink
~- -- _ <br />~i`~~ <br />1 <br />Memo - Stipulation Responses -2- March 21, 1985 <br />Stipulation No. 13 - All designs have been submitted. Note: Two problems <br />exist with the submitted material. <br />1. The design of ditch F2 showed that the existing 24" diameter <br />culvert passing flows under the haul road is not adequate. CYCC has <br />passed the responsibility of replacing this culvert with a 36" diameter <br />culvert to Twentymile Coal Company. The 6ivision should keep track of <br />this culvert replacement. <br />2. The submitted material includes a design for Ditch P-1 which does <br />not agree with that already contained in the permit. To avoid <br />confusion CYCC should remove Ditch P-1 from the submitted material. <br />Stipulation No. 14 - No information was found. <br />Stipulation No. 15 - The response for this stipulation was to request a small <br />area exemption for this area. This is a valid request, and I recommend <br />approval, however, I would suggest the construction of a berm on the uphill <br />side of the Homestead Irrigation Ditch to berm the flows from this area. <br />Finally, because this permit application addressed the ponds as permanent <br />structures and the Division is only approving them as temporary, the ponds are <br />much larger than necessary. There are several errors in the design <br />calculations, however, the ponds are adequate. Should CYCC provide additional <br />information to allow re-evaluation of these structures as permanent then the <br />Division should review the entire design. My copy, which I am returning to <br />you, is marked with changes that reflect the errors. <br />1. Both the Middle Creek and Mine No. 3 pond volumes were incorrectly <br />figured. The Middle Creek Detention Basin should have an interval <br />between elevations 20 and 15 of 5 feet not 2.5 feet. This increases <br />the volume of this basin from 7.98 ac-ft to 8.41 ac-f t. The volume of <br />the Energy Mine No. 3 Detention Basin was figured incorrectly using the <br />"Saunders Step Method" and should be 18.0 ac-ft instead of 21.3 ac-ft. <br />/ph <br />Doc. No. 8734 <br />