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. ' I I I <br />• • S <br />4.05 Hydrologic Balance <br />4.05.6 Sediment Ponds <br />Many of the requirements of 4.05.6 have not been addressed in the ~ond 1 <br />design. WF musC provide estimated sedimenC Melds, 10-year, 24-hpur <br />storage volume, and 25-year 24-hour peak flows. The elevation of the <br />water surface of the pond during passage of the 25-year event shou~d be <br />shown op the drawing, This elevation should also be determined an shown <br />on the Pond 4 drawing. The elevation.rof the sediment cleanout volu e <br />should be determined and shown on the drawings of the two ponds. <br />All pond drawings must bear the seal and signature of a <br />fessional engineer. <br />4.05.6(3)(6) <br />As sediment generation is highly variable from year to year, the D <br />requests a maintenance schedule which is based upon accumulated se <br />Wyoming Fuels should provide a statement that sediment cleanout wi <br />when 60% of the sediment storage volume is filled, show the elevat <br />pond drawings, and provide a marker in the pond showing this eleva <br />inspection and maintenance purposes. <br />4.05.6(3)(6) <br />The Division prefers the incorporation of automatic dewatering devj <br />new pond designs. We are concerned that manual devices require the <br />maintenance by an individual to operate properly and are, therefor4 <br />to human error. The Division will accept the pond design as given <br />is left open one inch at all times. <br />4.08 Use 'of Explosives <br />4.08.2 Pte-blasting Survey <br />The M & T well may qualify for a pre-blast survey. Wyoming Fuels o <br />such a survey if requested. <br />4.08.3 Public Notice of Blasting Schedule <br />4.08.3(1)(a) <br />The applicant should state that the initial blasting schedule will <br />to all appropriate individuals at least 10 days but not more than <br />to the beginning of the blasting program. <br />4.08,3(3) <br />pro- <br />vision <br />1 occur <br />on on the <br />ion for <br />ces in <br />continued <br />susceptible <br />if the gate <br />ust provide <br />~e distributed <br />days prior <br />The applicant should state Chat before blasting in areas or at times not in a <br />previously released schedule, or it theteis a substantial pattern ~f non-adherence <br />to the published schedule, a revised schedule will be published ands distributed. <br />