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}' <br />Ms. Ar[tte~ it eldt <br />Date• <br />Page Two <br />All sedimentation ponds are designed to contain the full design runoff volume resulting from <br />a 10 yeaz, 24 hour storm event. Stormwater storage capacity is in addition to design sediment <br />storage and any permanent storage capacty. Serr inspetxs all sedimentation ponds oa a <br />quanerly basis. Inspections include evaluation of aavmulated sediment levels relative to design <br />sediment storage capadtq to verify that design stormwater storage capacty is maintained at all <br />times. If inspections indicate that sediment aaumulations are at or near the design sediment <br />level, Kerr removes accumulated sediment from the pond(s) within a reasonable period (typically <br />30 co 60 days) following the inspection. Both pond inspettion reports and documentation of <br />pond cleanou[ are retained at the minesire and are available for inspection by authorized ageary <br />representatives. Based on dirett observation of pond storage levels at the time discharge <br />occurred, the duchazge 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 volttmes greater than the design 10 year, 24 hour <br />storage volume <br />Based on the preceding information, %err respectfully requests that the Water Quality Control <br />Division approve a stormwater exemption for eaoeedance of effluent limitations consistent with <br />exemption and assodated burden of proof provisions as outlined is Permit COG850021. It is <br />understood chat this exemption applies only ro the spet~ed monitoring period(s), the subject <br />outfall(s), and the following effluent parameters: <br />~ TSS ooh ~~~ <br />^ Settleable Solids ~ /~ <br />Other ~~ DD C b~~~ <br />We appredate your wnsideration of and mopention in this matter. Please feel free to wntact <br />me with any questions or if ou requue fiuther docummtarion. <br />i _ i <br />Sincer y, <br />r Coa] Company <br />~r~~ o~ S~le S/..~~9~ <br />- . • !rm <br />