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~' <br />Ms. Anne tfeldt <br />Dale: <br />Page Two <br />All sedimentation ponds aze designed to contain the full design runoff volume rerulting from <br />a 10 year, 24 hour storm event. Stormwater storage opacity is in addition to design sediment <br />storage and any permanent storage opadty. Rerr inspects all sedimentation ponds on a <br />quarterly basis. Inspections include evaluation of accumulated sediment levels relative to design <br />sediment storage opacity to verify that design stormwater storage capacity is maintained at all <br />times. If itupections indiote that sediment accumulations are at or neaz the design sediment <br />level, Kerr removes accumulated sediment from the pond(s) within a reasonable period (typically <br />30 to 60 days) following the inspection. Both pond inspection reports and documentation of <br />pond deanout aze retained at the minesite and are available for inspection 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 than or equal [o the design 10 yeaz, 24 <br />hour storage volume <br />^ Rainfall or snowmelt runoff volumes greater than the design 10 year, 24 hour <br />storage volume <br />Based on the preceding information, Rerr respectfully requests that the Water Quality Control <br />Division approve a stormwater exemption for eaceedance of effluent limitations consistent with <br />exemption and assodated burden of proof provisions as outlined in Permit COG850021. It is <br />understood that this exemption applies only to the specified monitoring period(s), the subject <br />outfall(s), and the following effluent parameters: <br />T~ C3~ <br />^ Settleable Solids <br />Other~/t'C~ 30.39`'307' <br />We appreaate your consideration of and cooperation in this matter. Please feel free to contact <br />me with any questions or if you require further documentation. <br />in rely, r: I~~~~ <br />err Coal C'o`mpany o <br />.. +!=)TOR?LcS\I <br />