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Ms. Patrida Nelson <br />Darr sL,>~*~ <br />• Page Two <br />Exceedana of applioble permit effluent limitations resulted from: <br />0' Dischuge from snowmelt runoff omsrring within 48 hours after tronoff inflows <br />to the pond(s) have slopped <br />^ Dischuge from rainfall runoff occurring within 48 hours aftu measurable <br />precipitation hu stopped <br />Documentation of predpitation and snowmelt oaurrena and snowmelt inflows to the ponds <br />is retained at the minesite and is available for inspection by authorized agency representatives. <br />Copies of relevant temperature/precipitationdesta ue attached for reference. <br />All sedimentation ponds ue designed to contain the full design runoff volume resulting from <br />a 10 year, 24 hour storm event. Stormwater nonage apadty is in addition to design sediment <br />storage and any permanent storage apacity. Kerr inspects all sedimentation ponds on a <br />quarterly buffs. Inspections include evaluation of accumulated sediment levels relative to design <br />sediment storage apadq to verify that deign normwater storage apaciry is maintained at all <br />times. ff inspections indiate that sediment accumulations ue at or nee the design sediment <br />level, Kerr removes accumulated sediment from the pond(s) within a reuonable period (typially <br />30 to 60 days) following the inspection. Both pond inspection reports and documentation of <br />pond cleanout ue retained at the minaite and ue available for inspection by authorized agency <br />• representatives. Based on direct observation of pond storage levels at the time disr~tuge <br />occurred, the discharge resulted from: <br />Rainfall or snowmelt runoff volumes leu than or equal to the design 10 yeu, 24 <br />hour storage volume <br />^ Rainfall or snowmelt runoff volumes grater than the design 10 yeu, 24 hour <br />storage volume <br />Based on the preceding informuion, Kerr respectfully requests rhu the a7uer Quality Control <br />Division approve a stormwater exemption for aceedance of effluent limitations consistent with <br />exemption and associated burden of proof provisions u outlincd in Permit COG850021. It is <br />understood that this exemption applies only to she spedfied monitoring period(s), the subject <br />outfall(s), and the following effluent puameters: <br />~ TSS <br />^ Sealable Solids <br />Other /e <br /> <br />