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<br />Stipulation No. 15 <br />PLANS FOR RECONSTRUCTION OF THE UNNAM <br />CREEK IN ACCORDANCE WITH RULES 2.05.4( <br />BE PROVIDED TO THE DIVISION WITHIN <br />ISSUANCE AND THE BOND AMOUNT MUST BE RE <br />IF DEEMED NECESSARY. <br />i TRIBUTARY OF PRYOR <br />~(c) AND 4.05.4 MUST <br />6 MONTHS OF PERMIT <br />'ALUATED AND ADJUSTED <br />Reply <br />The Permit Area encompasses an ephemeral stream, known as the <br />unnamed tributary, that had been relocated d e to previous mining <br />operations in the area (See Figure 1). The lower portion of the <br />original watercourse is no longer identifi le as the area has <br />been reclaimed and the watercourse oblite ated. The current <br />watercourse location passes through sedimen pond 'K', under the <br />haul road via a 36 inch CMP culvert, thr ugh a 20 foot wide <br />channel excavated in sandstone and then ove a broad, disturbed <br />floodplain before joining with Pryor Canyon Creek. (See drawing <br />JFSA-7 in map pocket.) The drainage area o the tributary above <br />the culvert is 151 acres, less than 1 squar mile. The purpose <br />of this reply to the stipulation is to pre ent a reconstruction <br />plan for the tributary that will meet the requirements of the <br />CMLRD for a permanent diversion (Rule 4.05.4 4)). <br />The reconstructed channel was designed to pass the runoff <br />from the 24-hr 100 year precipitation even The peak rate of <br />flow of 200 cfs was determined using the SC Method described in <br />SCS's publication "Procedures for Determ Wing Peak flows in <br />Colorado" March, 1980. The calculations are included as Appendix <br />A. <br />In order to avoid artificial control s' <br />possible, the plan calls for the removal of <br />culvert. This can be done if a deep swale <br />road. The road will be used infrequently of <br />into private property and therefore must r <br />road gradient into and out of the swale v <br />percent. The channel sections have been d <br />existing sections. Velocities and depth <br />:ructures as much as <br />the existing 36 inch <br />is cut into the haul <br />=er mining for access <br />amain passable. The <br />ill be less than 10 <br />esigned to match the <br />are below erosional <br />