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f:ROM :AGO NAT. RES. SECTION 303 832 8106 1995,06-07 08:19 #675 P. 18/18 <br /> - Columbus Mine Portal-Animas Forks <br /> A bulkhead will be installed in two adits to prevent direct mine discharge in order to <br /> return the hydrologic regime to near premining conditions. <br /> - London Portal-Headwaters of Animas River <br /> A bulkhead will be installed in the adit to prevent direct mine discharge in order to return <br /> the hydrologic regime to near prPmining conditions. <br /> Schedule <br /> The voluntary mitigation projects will start shortly after valve closure and diversion of Cement <br /> Creek. Construction is confined to summer and fall months due to the heavy winter snowfalls <br /> that occur in the Upper Animas Basin. <br /> The "A" list of primary projects will be completed within the first two field seasons. Monitoring <br /> at the reference point for removal of metals loading begins concurrently. Upon completion of the <br /> "A"list of voluntary projects, SGC will then start on the "B" list or secondary list of voluntary <br /> projects, if the projects are successful in removing dissolved zinc loading from the Upper <br /> Animas River all voluntary projects required to maintain ambient quality will be completed in 3 <br /> to 4 years. <br /> MM-4&M <br />