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File No. C05000-0375 <br /> 3rd Quarter 1997 Report <br /> Page 2 <br /> American Tunnel Bulkhead <br /> The American Tunnel bulkhead was inspected, gage pressure readings taken, and fluid samples <br /> analyzed for pH, conductivity, and temperature more frequently than the requirements of Items 3. <br /> and 4. in the Rule Authorization letter. This information is attached along with a water quality <br /> sample analysis summary sheet for the water behind the American Tunnel bulkhead. <br /> The valve on the American Tunnel bulkhead drain pipe has remained closed since closure on <br /> September 9, 1996. <br /> Site inspections have not revealed any indication that the bulkhead is performing other than as <br /> designed. <br /> Inieation Ouantities <br /> Alkaline injection was active intermittently from project startup for the 1997 construction season <br /> on July 14, 1997 through September 30,1997. During this period, a total of 241.5 tons of <br /> hydrated lime was placed underground through the injection site in Sunnyside Basin. Intermittent <br /> injection was used in order to allow mixing and distribution time within the mine workings <br /> between injection episodes. <br /> The total quantity of water and hydrated lime placed underground during this period was 5.3 MG. <br /> Attached is a table of daily water volumes placed into the mine pool through the injection site. <br /> Please contact me if you have any questions on this report. <br /> Sincerely, <br /> Larry Perino <br /> Reclamation Manager <br /> cc: Sarah Johnson, CDPHE <br /> Wally Erickson, DMG <br />