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• POND 15 -PI <br />?be following criteria rare need in the design of the pond. <br />the pond rill: <br />t <br />~• ~ 1. provide storage for the mximum anticipated inflow <br />1. from a 10 year 24-hour precipitstion event plus the <br />mzimtan 3 year sediment volane. <br />_ 2. nse a trapesoidal spillray which is designed to <br />discharge the runoff from the 25 year 24-hour <br />• storm. <br />3. provide for the elevation of the crest of the dam <br />to be at least 1.5 feet above the mximum rater <br />elevation with the spillray flaring at design <br />depth. <br />4. nse a SU inch diameter deratering pipe at the <br />downstream outlet. The pipe rill permit 24-hour <br />detention time for the 10-year 24-hour storm <br />volume, and at the same time provide deratering of <br />j the pond to the sediment storage level in leas than <br />72 hours. <br />5. aiaimise the amount of disturbed surface area. <br />6. be cleaned Then the sediment volume reaches 601 of <br />capacity. Cleanout rill be provided by a piece of <br />` construction equipment operating inside the pond at <br />an area of stable, shallow slope. <br />7. be excavated in a manner that allows all topsoil to <br />be removed, stockpiled and ze-used in reclamation. <br />8. be inspected during construction by a registered <br />professional engineer. <br />9. the discharge from the pond rill acct the <br />requirements as set forth in the NPDES permit. <br />10. be removed during reclamation. <br />CTt+-5 PEE ~R~9M. P9Nd ~ RED i ~ ~ ~ NS <br />5uC3M ~ i -r~E~ L3Y (nfL~6 (.~Eu~~cc.~ DrJ <br />~ dc-r-Aa~- aq ~ {~ 8 `~ ~ Tf} 6 S uJFks <br />~~ J <br />~PP2ov~o QY ~li~, <br /> <br />z <br />