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Stormwater Management Plan <br />Non-stormwater discharges are not anticipated to occur. No man -induced springs, landscape <br />irrigation, construction dewatering or concrete washout is anticipated. An uncontaminated spring <br />exists near the Idaho portal, and is referred to as the Idaho Spring. Historically, the volume of <br />water emanating from the Idaho Spring has been small (less than 0.5 cubic feet per second), and <br />flow from the Idaho Spring discharges to the La Plata River. <br />Receiving Waters: <br />The La Plata River is a perennial river whereas the Little Deadwood Gulch, which drains the <br />permit area, is an ephemeral tributary to the La Plata River. Little Deadwood Gulch drainage <br />discharges in response to snow melt and thunderstorm runoff events directly into the La Plata <br />River. <br />Underground storm water and sewer drain (piping) systems will not be constructed on site. <br />9. Wetlands: <br />The U.S. Anny Corps of Engineers granted the operator coverage under 2008 Nationwide Permit <br />No. 14. On March 4, 2008, the operator received notification of permit approval from the Corps <br />for impacts to adjacent wetlands during construction activities associated with the new access <br />road at the site. The operator has completed and is monitoring the progress of its wetlands <br />mitigation activities. <br />Site Map - see Attached Exhibit U, Attachment U-3, Figure U-1. <br />Stormwater Management Controls <br />1. SWMP Administration <br />Contact: George M.L. Robinson <br />May Day Idaho Mine Complex <br />3926 North State Hwy 67 <br />Sedalia, Colorado 80135 <br />303.832.7664 (o) <br />georgerobinson@r2incorporated.com <br />2. Identification of Potential Pollutant Sources: <br />a. Disturbed soils and stockpiled soils <br />Currently there are no stockpiled soils on site. <br />Future operations will require temporarily (<180 days) stockpiling of run of mine rock <br />on existing mine benches, where illustrated BMPs will be implemented as outlined in <br />Appendix A <br />Sunrise Mining, LLC <br />Revised August 9, 2017 <br />Page 8 of 30 <br />