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which drains the preparation plant yard area <br /> and flows to the four settling ponds above <br /> Outfall 001. The 001 ponds will serve as a <br /> short-term back-up treatment system to ensure <br /> compliance. <br /> The overflow line will be equipped to allow <br /> valving of the water from the surge tank <br /> directly to Outfall 028 when it is determined <br /> the water from the surge tank meets effluent <br /> requirements. <br /> However, the normal function of the system is <br /> that water from the surge tank is pumped to <br /> four mixed media filters. <br /> Mixed-media Filter <br /> The mixed media filters are be employed to <br /> assure compliance with discharge requirements. <br /> There are four filters in parallel. H2O rates <br /> their design capacity at 392 gpm each. <br /> During normal operation of the system, the <br /> filters will "polish" clarifier overflow, <br /> removing additional fine particles from the <br /> water prior to discharge. <br /> The combined capacity of the filters is <br /> sufficient to accomodate the 1,000 gpm which <br /> is the upward design parameter of the system. <br /> In the event of a major malfunction in the <br /> other components (classifier, thickener and <br /> clarifier) of the system, the filters would be <br /> sufficient as a treatment method (on a short <br /> term basis) to clean the mine water to meet <br /> discharge requirements. <br /> Back-wash (removal of the solids from the <br /> filters) is initiated automatically by pressure <br /> drop instruments. Solids are re-cycled to the <br /> thickener for removal with the underflow <br /> solids. <br /> Instrumentation and operation <br /> Alarm/indicator lights are provided for pumps, <br /> mixers, tank levels and filter back wash. <br /> Switches are provided for pumps and mixers. <br /> Audible alarms are provided for Hi-Low tank <br /> levels and motor trips. The alarm(s) sound in <br /> 4 <br />