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COR-040000 Stormwater Management Plan <br />01 1. INTRODUCTION <br />This Storm Water Management Plan (SWMP) was prepared for Denison Mines (USA) Corp. <br />(Denison), for the Van 4 Shaft mine. This SWMP was prepared in accordance with good <br />engineering, hydrologic, and pollution control practices. Changes or additions may be required <br />to address changes in conditions at the facility. As a condition of the Colorado Discharge Permit <br />System (CDPS) permit, the provisions identified in the SWMP will be implemented as written <br />and updated as needed from commencement of mining activity until final stabilization is <br />complete. <br />This document contains the required elements of a SWMP associated with Denison's mining <br />activities for the Van 4 Shaft site, as defined in the CDPS General Permit for Stormwater <br />Discharges Associated With Metal Mining Operations, Authorization To Discharge Under the <br />Colorado Discharge Permit System (Permit No. COR-040000, effective October 1, 2006). The <br />mining activity will not take place on tribal lands, however, the mines are located on Bureau of <br />Land Management (BLM) land; therefore, BLM regulations will also be followed and are <br />included where applicable. BLM recommended best management practices are included in <br />Appendix B. No additional local standards apply. <br />The purpose of this SWMP is to: <br />• Identify all potential sources of pollution which may reasonably be expected to affect the <br />quality of stormwater discharges associated with industrial activity from the facility; <br />• Describe and ensure the implementation of practices which are to be used to reduce the <br />pollutants in stormwater discharges associated with industrial activity at the facility; <br />• Ensure the practices are selected, installed, implemented, and maintained in accordance with <br />good engineering practices, including the installation, implementation and maintenance <br />requirements; and <br />• Provide instructions on implementation of the SWMP as written and guidance on updating it <br />upon changes of the facility or processes as a condition of the permit. <br />Van 4 Shaft SWMP 1 Denison Mines (USA) Corp.