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Attachment LK <br /> Page LK-3 <br /> Permit No. CO-0044768 <br /> Remedial Goals and Objectives <br /> Reduction of dissolved zinc(70%)flowing past the M-02 sampling point at the Koehler Longfellow site on Red <br /> Mountain Pass. Actions taken to reduce dissolved zinc will also traduce low pH,metal laden waters flowing into the <br /> headwaters of North Mineral Creek by: <br /> (1) design of a passive bio treatment system to be given to WQCD; <br /> (2) reduction of acidity in the headwaters by isolating or limiting abilities of waters to react with pyrite and <br /> other sulfide minerals; <br /> (3) reduction of exposure to waste material by snowmelt,rainwater and intermittent streams;and <br /> (4) visually reclaim area to accepted reclamation standards. <br /> Site Loading Estimate <br /> Loading from this site is due to the intermixing of adit flows,drainage ham the small basin and stormwater <br /> through a common discharge point(M-02),that has been monitored multiple times.The average results of the monitoring <br /> of M-02 for quantity and quality was used to estimate the impact of dissolved zinc from adit flows from this site. The <br /> average M-02 loading information was used and the assumption made that the same percentage attnbu table to waste <br /> dumps during a SGC sample session at the site is applicable to this average loading. <br /> Based on these assumptions and procedures, SGC estimates that the average daily loading for mine waste <br /> impacts at this site may be as much as 32.5 pounds of dissolved zinc per day.SGC is under no obligation to defend these <br /> estimates and they should only be used as an estimate.SGC does not represent that its mitigation prged at this site will <br /> remove any specific percentage of metals loading from this site: Tile loading estimate contained herein does not form <br /> the basis of an enforceable permit obligation. <br /> Description of Project <br /> Hydrologic Controls <br /> lnfrltration Controls <br /> The upland property has not been examined by SGC to see if there are any open stopes,glory holes or other <br /> subsidence features that may be adding water to the portal flows.The following will be done to determine if infiltration <br /> controls have potential to reduce Adit flows. <br /> (1) Thorough examination of the surface looking for features which may be diverting water through mine <br /> workings. <br /> (2) Should any features be found they will be studied to see if run on run off controls are practicable. <br /> (3) SGC will implement controls such as ditching,to prevent infiltration where practicable. <br /> Site Run On Controls <br /> There exist two possible sites for run on controls at the portal area. The first source of water flows from the <br /> drainage area and pond to the North,around the Longfellow Shaft and contacts dump material before flowing into the <br /> lower pond at the portal area. The second source of flowing water needs to be evaluated but may be flowing from U.S. <br /> Basin. This stream flows next to the South(Koehler) Adit and contacts the dump material. Both sources can be hest <br /> handled by simple diversion in a lined ditch to prevent any contact with contaminated water or mine waste material. The <br /> ditch water will be recombined below the site named M-02. <br />