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r <br /> Attachment NIHC <br /> Page No. NIHC- I <br /> Permit No. CO-0044768 <br /> Mine Remediation Plan: Ma\Ilo\\er Facility - Upland <br /> Hydrological Control <br /> Remediatinp, Partv. Sunnyside Gold Corporation <br /> PO Box 177 <br /> Silverton CO 81433 <br /> Contact Larry Perino <br /> Reclamation Manager <br /> 1. Description of Mmmf;Activities <br /> Physical Description of Conditions <br /> The natural drainages on the slopes of Tower Mountain up-gradient from the Mayflower Mill facility <br /> and Tailings Pond No. 1 gather snow-melt and rainfall runoff on approximately 150 acres. Due to <br /> the limited soil cover in this area, a large percentage of the precipitation that falls reports as surface <br /> runoff until the rock - landslide contact where these flows go underground to emerge lower in the <br /> valley as seeps and springs. The Mayflower Mill facility and Tailings Pond No. I are located within <br /> the pathway of these drainage and at the upper elevation of where these seeps and springs begin to <br /> emerge. It is probable that these seeps and springs have contact with tailings and mine waste <br /> material especially when higher flows exist in the spring. Currently up-land drainage control exists <br /> at this facility to intercept and divert surface runoff around the site. This interception and <br /> hydrological control project will address flows entering the groundwater regime outside the facility <br /> boundary. <br /> General Description of the Project Site <br /> The hydrological control site is located on the slope of Tower Mountain directly behind the <br /> Mayflower Mill facility and Tailings Pond No. 1 located on the west side of the facility The site is <br /> 1 3 miles northeast of the Silverton town limit on Colorado Highway 110. See attached location <br /> map <br /> Identification ol'Lands <br /> The interception points for the hydrological control project are located on public lands administered <br /> by the Bureau of Land Management, and land owned by Sunnyside Gold Corporation (SGC) but <br /> outside the facility Storm\vater Permit area (COR- 040054) and Mined Land Reclamation Permit <br /> area (M77-378) The constructed drainage pathways will divert water into the existing up-gradient <br />