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• Ms. Paige Seville -2- May 29, 1984 <br />1. The pond dewatering device must be designed to achieve enough detention <br />to meet effluent limits but also to discharge within 36 hours. The dewatering <br />devise should be automatic so that the pond will dewater by itself when no one <br />is on site such as during weekends, holidays, times of temporary or permanent <br />cessation, and during the 10 year bond liability period after reclamation. <br />The revision should specifically address detention time and include designs <br />for an automatic dewatering device. <br />8. From the design on Attachment "C" it is unclear as to how access to the <br />gate value will be achieved when the pond is full. Please clarify. <br />9. The tap width of the embankment as indicated on Exhibit C does not meet <br />the design requirement of Rule 4.05.6(8)(h). The embankment profile should be <br />redesigned in consideration of this rule, a revised cross-section should be <br />submitted. <br />10. A pond cross-section should be provided that indicates the elevations of <br />the 100% sediment storage level (dewatering location), the 50% sediment <br />storage level (cleanout elevation), 10 year and 25 year water stage level. <br />The plan view of the pond (Attachment B) should show the 10 year high water <br />line. <br />If any questions arise on the above items please feel free to contact me. <br />Sincere "y _- - <br />~- .., <br />/~~-c ~ -_ <br />Robert G. Liddle <br />Reclamation Specialist <br />RGL/tlh <br />Doc. No. 1661 <br />• <br />