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5.3.1.7 Process Water Storage Tanks <br /> Description: Two welded steel tanks serve to store and contain mill process water returned from <br /> Robinson Reservoir. Each is capable of holding 2 million gallons of water. <br /> Location: Southeast of Mill Building. <br /> Spill Potential: Low. <br /> Potential Volume Spilled: 2 million gallons if one entire tank ruptured. <br /> Prevention and Control: If there was a slow leak of the westernmost tank, water would <br /> probably flow down the access road and eventually enter the tailing system. A rapid release of <br /> water from either tank could possibly impact the Arkansas drainage. Containment <br /> improvements, in the form of a berm, are being designed and will be built in 1996 after <br /> approval of the capital budget. <br /> Countermeasures: Spilled process water must be diverted to the west along the road or the road <br /> sideditch. To accomplish this it may be necessary to mobilize a dozer or backhoe to dig a <br /> temporary diversion ditch south of the tanks and with enough capacity to force water to the west. <br /> A small leak of several gallons per minute can be contained with a sump and portable pump <br /> system or simply by trapping water in a diked (earthen) area. Pumping the water to the road <br /> sideditch would insure it reaches the tailing system. <br /> Nearest Clean-up Equipment: Gas powered portable pumps are located in the Precon <br /> Building. A dozer and backhoe are located in various locations throughout the minesite, most <br /> likely in the open pit area. <br /> Monitoring: During normal Mill operations the tanks are checked daily. Inspections are <br /> conducted quarterly. <br /> Reporting: All spills of process water from the storage tanks should be documented using the <br /> "Spill Incident Report" form immediately (Appendix 1), and copies provided to the <br /> Environmental Coordinator. <br /> 45 <br />