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Logan Wash Mine Annual Report <br />Permit No.: M-1977.424 <br />Research Mine (Outfall 002) near the portal entrance. In the summer of 2005, OOSI constructed <br />a mine drainage pipeline from the Research Mine to the top of the stonnwater channel on the <br />northern portion of the Lower Bench (see Technical Revision No. 6). This work was done to <br />locate both outfalls in the upper part of Dry Gulch, so that the monitoring requirement at the <br />downstream flume would apply to both outfalls. <br />Sampling was not conducted at Outfalls 001 and 002 during the reporting period because of no- <br />flow conditions at the designated outfall point (flume). Quarterly NPDES Discharge Monitoring <br />Reports were submitted to the Colorado Department of Public Health and Environmental for <br />Outfalls 001 and 002 during the reporting period. <br />In the Spring of 2006, the Research Mine discharge pipe valve was closed and the mine was <br />allowed to flood. This was done to store water for revegetation irrigation use later in the summer. <br />During this time the manometer in the Research Mine vault was monitored for head inside the <br />mine. For more information regarding the Research Mine portal closure and management of the <br />Research Mine drainage see Technical Revision (TR) No. 4 and TR No. 6 which present <br />significant revisions to Exhibit E, the Reclamation Plan for Logan Wash Mine. <br />3.2 Mine-Water and Retort-Water Discharge <br />Discharge measurements of clean (non-retort) mine-water discharge (Outfalls 001, and 002) and <br />retort-water discharge were conducted on a quarterly basis when possible. These data were <br />collected by OOSI to assess and evaluate mine closure effectiveness and to support operation and <br />maintenance of the evaporation pond. <br />Sampling of retort mine drainage water was conducted in October 2006 to evaluate retort water <br />quality and long-term trend analysis. The sample was collected from the retort drainage pipeline <br />inside the Lower Bench Vault. The analytical results indicated no significant improvement of <br />retort water compared to past sampling events. <br />4.0 Reclamation Activities in 2006 <br />Reclamation activities conducted at the Logan Wash Mine in 2006 are discussed in the following <br />sections. <br />4.1 Revegetation/Irrigation <br />During the reporting period the irrigation system for planted saplings on the Upper and Lower <br />Mine Dumps was reemployed. Polyethylene tanks were set in place and piping was installed to <br />collect and store water for irrigation of saplings on mine dump faces. Research Mine water <br />(Outfall 002) was shut-in to store water for plant irrigation purposes and was diverted to <br />polyethylene tanks during irrigation operations. In addition, irrigation water included the use of <br />the L-1 Portal mine discharge water (NPDES Outfall 001) which was captured in the Lower <br />Bench Vault through the use of a small polyethylene tank. An electric pump was used to pump <br />water from the vault to a previously installed surface polyethylene storage tank. Maintenance of <br />the plant irrigation system included repairs, diverting of water, and eventual winterization. <br />Irrigation of saplings planted on the mine dump faces was conducted periodically through out the <br />summer months. 1n addition, irrigation supplement polymer was installed in the root zone <br />access tubes at selected locations. Repairs were conducted to pumping and other irrigation <br />system components. <br />Western Water 8 Land, Inc. <br />