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<br /> <br />Ms. A e ld <br />Date• <br />Page T o <br />All sedimentation ponds are designed to contain the full design runoff volume resulting from <br />a 10 year, 24 hour storm event. Stormwater storage capacity is in addition [o design sediment <br />storage and any permanent storage capacity. Kerr inspects all sedimentation ponds on a <br />quarterly basis. Inspections include evaluation of acuumulated sediment levels relative to design <br />sediment storage capacty to verify that design stortttwater storage capacty is maintained at all <br />times. If inspections indicate that sediment aaumulations are ar or near [he design sediment <br />level, Kerr removes accumulated sedimen[ from the pond(s) within a reasonable period (typically <br />30 [0 60 days) following the inspection. Both pond inspection reports and documentation of <br />pond clean-out 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 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 />Based on the preceding information, Kerr respectfirlly requests that the Wuer Quality Control <br />Division approve a stormwater exemption for aoeedance 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 speafled monitoring period(s), the subject <br />oucEall(s), and the following effluent parameters: <br />~,' TSS X02^ <br />^ Settleable Solids <br />,~' Other ~~ Zi2a./ ~`/~~ <br />We appredate 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 />Sin rely, <br />err o "Compan ~"~`~ <br />C.._ 37:5?OCV.ESN <br />