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Reclamation Feasibility Report - Virginia Canyon <br />0 <br />• <br />Lower Clarissa Tunnel (Site #10) <br />Location <br />The Clarissa Tunnel is located in the mainstem of Virginia Canyon approximately 2.5 miles above <br />Clear Creek (Figures 3 and 21). The mine waste pile was sampled as site #10. Site #10 is located <br />at LAT. N390 46'02.7", LONG. W105° 32'14.6". The adit of the Clarissa Tunnel is designated as <br />water quality station DM-1. The adit has been observed to drain during wet years. No drainage was <br />observed in 2000. The estimated volume of mine waste is 2,300 cubic yards. <br />Historic Structures <br />The remains of a loadout structure is located on the waste pile. The timbered adit is intact. <br />Water Quality Impacts <br />The toe of the waste pile is being actively eroded by the stream. There is also some minor erosion <br />from road drainage that flow over the pile. The waste rock contains high concentrations of soluble <br />arsenic, copper and lead. Results from the 2:1 leachate analysis are given below. <br />Site #10 <br />• <br />pH <br />S.U. Total Acidity <br />m /I As <br />b Cd <br />b Cu <br />b Fe <br />b Mn <br />b Pb <br />b Zn <br />b <br />2.38 1900 2200 260 7500 35000 2200 10000 49000 <br />Reclamation Measures <br />The recommended reclamation measure for this site is to remove the waste rock near the stream <br />and consolidate on-site. The waste rock within 10 feet of the stream channel should be moved to <br />the main pile toward the county road. The toe of the reclaimed pile should be armored with riprap to <br />46 <br />Figure 21. Lower Clarissa Tunnel (Site #10)