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5.3.1.2 Mayflower Clearwater Pond <br />• <br />Description: This pond is the holding facility for seepwater and decanted Mayflower Tailing <br />Pond water which is pumped back to the Industrial Water System via the Mayflower Pump <br />System. <br />Location: The Mayflower Clearwater Pond is located at the toe of No. 5 dam adjacent to the <br />Mayflower Waste Water Treatment Plant (MFWWTP). See Figure 1. <br />Spill Potential: Pump failure in conjunction with a high water level in the Clearwater holding <br />pond could result in a short-term spill into Ten Mile Creek. <br />Potential Spill Volume: 600 gallons per minute until the pumps are brought back into service. <br />Prevention and Control: (1) Standby pumps are located in the pump house; (2) a standby <br />generator minimizes pump failures due to electrical power interruptions; and (3) Clearwater <br />Holding Pond water levels are maintained to minimize spill potential. <br />Countermeasures: In the event of total failure of the Mayflower Pumping Systems, mine <br />personnel would increase dilution in interceptor canals, sandbag the Clearwater Holding Pond, <br />and overtreat the Mayflower Tailing pond (with lime) to precipitate metals. Should there be an <br />overtopping of the Clearwater Pond, and untreated water escapes the system, a temporary <br />• pumpback system using portable generators and pumps can be installed while repairs are made to <br />the system. <br />Location of Clean-up Materials and Equipment: The most effective way to handle a spill will <br />be the adjustment of the system as described above; therefore the location of spill clean-up <br />materials is not as important as with other spill scenarios, However, crushed limestone and <br />slaked lime are available at the lime slaking and storage facility east of Ten Mile Tailing Pond; <br />portable pumps and generators aze located at the mine wazehouse. <br />Visual Inspections and Integrity Testing: The Mayflower Clearwater Pond is visually checked <br />daily. A pump system alarm is telemetrically connected to the Mill Control Room. <br />Reporting: All spills threatening the waters of the State of Colorado are subject to the reporting <br />requirements of Sections 4.2, 4.3, and 4.4 of this SPCC/MCP Plan. All spills should be <br />documented on the "Spill and Release Information Sheet" immediately (Appendix 1), and given <br />to the Environmental Department. As a matter of corporate policy, a high level of documentation <br />is required for any system failure at the Mayflower Clearwater Pond. <br />Conformance with Applicable Requirements: At the time of this writing (May 2004) the <br />Mayflower Clearwater Pond is in conformance with applicable regulatory requirements. <br />48 <br />