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_. ~' <br />Ms. Anne tl 'nfeldt <br />Date: <br />Page T o <br />All sedimentation ponds are designed to con[ain the full design runoff volume resulting from <br />a 10 year, 24 hour storm event. S[ormwater storage capacity is in addi[ion to design sediment <br />storage and any permanent storage capacity. Kerr inspects all sedimentation ponds on a <br />quanerly basis. Inspections include evaluation of accumulated sediment levels rela[ive to design <br />sediment storage capaary to verify that design stormwater storage capacity is maintained at all <br />times. If inspections indicate that sediment accumulations are at or near the design sediment <br />level, Kerr removes accumulated sediment from [he pond(s) within a reazonable period (rypically <br />30 to 60 days) following the inspection. Both pond inspection reports and documentation of <br />pond clean-out are retained at the minesite and are available for inspettion by authorized agency <br />representatives. Based on direct observation of pond storage levels at the time discharge <br />occurred, the discharge resulted from: <br />Rainfall or snowmelt runoff volumes less [han or equal to the design 10 year, 24 <br />hour storage volume <br />^ Rainfall or snowmelt runoff volumes greater than the design 10 year, 24 hour <br />storage volume <br />Bazed on the preceding information, Kerr respettfully reques[s that the Water Quality Control <br />Division approve a stormwarer exemption for exceedance of effluent limitations consistent with <br />exemption and azsocia[ed burden of proof provisions az outlined in Permit COG850021. It is <br />understood that this exemption applies only to [he specified monitoring period(s), the subject <br />outfall(s), and the following effluent parameters: <br />Tss ~3~3) <br />^ Settleable Solids <br />~( Other 1J- D/~ ,303 ~ 3~~~ <br />We appreciate your consideration of and cooperation in this matter. Please feel free to contact <br />me with any questions or if you require furcher documentation. <br />erely, <br />err Coal Company <br />c . ::;Tour . ~: •: <br />