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Pond design criteria and calculations are presented in Exhibit 19, Drainage <br />• and Sediment Control Plan, which reflects the size, configuration, and <br />surface conditions affecting runoff within contributing drainage areas. <br />Both the Water Treatment and Recycle Pond No. 2 and Freshwater Pond No. 3 <br />have been designed as storage ponds without conventional spillway discharge <br />structures. These ponds have been designed to meet plant process and <br />consumptive use requirements and include sufficient excess capacity to retain <br />direct storm precipitation on the pond surface while maintaining adequate <br />freeboard to prevent overtopping of the pond embankments. The configuration <br />and construction of Ponds 2 and 3 are graphically illustrated by the Water <br />Treatment and Recycle Pond 2 and Freshwater Pond 3 Designs, (Map 22). <br />Water Treatment and Recycle Pond No. 2 is designed to contain approximately <br />600,000 gallons of water. The pond, a lined excavation which provides some <br />storage capacity far excess dewatering flows, serves as a reservoir for <br />preparation plant process water needs, and functions as a settling basin for <br />suspended solids in the process water stream. The water level in Pond 2 is <br />• maintained by discharging water from Freshwater Pond No. 3 through a gravity <br />decant and pipeline system. Process water is recycled to Pond 2 by pipeline <br />from the preparation plant to allow settlement of suspended solids. <br />Clarified decant water from the pond surface is returned to the preparation <br />plant by a gravity decant and pipeline. <br />Freshwater Pond No. 3 is designed to store approximately 3.000,000 gallons of <br />water from the Corley Mine Well. Pond 3, which is a lined excavated pond. <br />serves as the primary clean water reservoir to supply all mining and process <br />water requirements. Water can be transferred by means of a gravity decant and <br />associated pipelines and control valves from Pond 3 to either Pond 2 to meet <br />process water requirements or directly to discharge point 003. <br />L~ <br />~` a - <br />C:1TM1660\V OL.110P. PLN <br />09/30/9412:57pmWP51/cmc 2.05.3-45R Revised - 9/30/94 <br />