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<br />11 <br />NOTES: <br />1. If usedto control runoff entering the pit during mining, <br />construct outlet pipe to drop manhole and terminate with <br />temporary, pre-formed, riprap scour basin. <br />2. If used during mining, normal-pool contains up to 25- <br />year flood, which can be pumped and discharged to an <br />adjacent mined azea block, or otherwise disposed. <br />During mining, provide flood storage up to 5 ~-year flood <br />before discharging through emergency spillway. <br />3. During reclamation, construct drop-manhole, extend <br />outlet pipe and terminate with preformed riprep scour <br />basin. Tf high-wall founded in rock, then drop manhole <br />and outlet extension not required. Create stopped energy <br />dissipater down rock slope in place of onriet extension <br />(see figure "Sloping Drop Strucmta"). Similar flood <br />protection provided after reclamation es during mining. <br />~ GCC Rio Grande <br />Red Rock Plant and Mine <br />ARROYO "I" DETENTION POND <br />June 13, 2002 <br />