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<br />' Ms. Patriaa Nelson <br />Date:-~ /fT- <br /> Page Two <br />' Exceedance of appliable permit effluent limits[ions resulted from: <br /> CrJ' Discharge from snoes•melt runoff occurring within 48 hours after runoff inflows <br />' to [he pond(s) have stopped <br /> ^ Discharge from rainfall runoff occurring within 48 hours after measurable <br />' precipitation hu stopped <br /> Documentation of precipitation and snowmelt occurrence and snowmelt inflows to the ponds <br />' is retained at the minesite and is available for inspection by authoriud agency representatives. <br /> Copies of relevan[ temperature/precipitation da[a are attached for reference. <br />' All sedimentation ponds are designed to contain the full design runoff volume resulting from <br /> a 10 year, 24 hour storm event. Storma•ater storage apacity is in addition [o design sediment <br /> storage and any permanen[ 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 ppacity [o verify that design stormwater storage apacity is maintained at ill <br /> times. If inspections indiate that sediment accumulations are at or near the design xdiment <br />' level, Kerr removes accumulated sediment from the pond(s) R•ithin a reasonable period (typially <br /> 30 to 60 days) following the inspection. Both pond inspection reports and documentation of <br /> pond cleanout are retained at the minesite and ue available for inspection by authoriud agenry <br /> representatives. Based on direct observation of pond storage levels at the time discharge <br /> occurred, [he discharge resulted from: <br />' C~ Rainfill or snowmelt runoff volumes less than or equil to the design 10 year, 24 <br />hour stora <br />e volume <br /> g <br />1 ^ Rainfall or snowmelt runoff volumes greater than the design 10 year, 24 hour <br />e volume <br />stora <br /> g <br /> Based on the preceding information, Kerr respectfully requests that the Water Quility Control <br /> Division approve a stormwater exemption for ezceedance of effluent limitations consistent with <br /> exemption and associated burden of proof provisions u outlined in Permit COG850021. It is <br /> understood that this exemption applies only to the specified monitoring period(s), the subject <br />' outfill(s), and the following effluent parameters: <br /> l~ TSS <br />' <br /> Settleable Solids <br />^ <br />' -/ <br />f~ Other /~ <br />1 <br /> <br /> <br />