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1. INTRODUCTION <br />URS Corporation prepared this Stormwater Management Plan (SWMP) for Denison Mines <br />(USA) Corp. (Denison) to be used at the Sunday Mines project. This SWMP was prepared in <br />accordance with good engineering, hydrologic and pollution control practices to ensure the Best <br />Management Practices (BMPs) are selected, installed, implemented and maintained to protect <br />surface waters. Changes or additions may be required to address changes in conditions at the <br />project. As a condition of the Colorado Discharge Permit System (CDPS) permit, the provisions <br />identified in. the SWMP will be implemented as written and updated as needed from <br />commencement of mining activity until final stabilization is complete. <br /> <br />This document contains the required elements of a SWMP associated with Denison's <br />construction and mining activities for Sunday Mines, as defined in the CDPS General Permit for <br />Stormwater Discharges Associated With Construction Activity, Authorization To Discharge <br />Under the Colorado Discharge Permit System (Permit No. COR-030000, effective July 1, 2007). <br />The mining activity will not take place on tribal lands, however, the mines are located on Bureau <br />of Land Management (BLM) land; therefore, BLM regulations will be followed. No additional <br />local standards apply. <br />a) The purpose of this SWMP is to: <br />,0 <br />• Identify all potential sources of pollution which may reasonably be expected to affect the <br />quality of stormwater discharges associated with mining activity from the project; <br />• Describe the practices to be used to reduce the pollutants in stormwater discharges <br />associated with mining activity at the project; <br />• Ensure the practices are selected and described in accordance with good engineering <br />practices, including the installation, implementation and maintenance requirements; and <br />• Be implemented as written and updated, from commencement of earth-disturbing activity <br />until final stabilization is complete, as a condition of the permit. <br />b) Spill Prevention Control and Countermeasure (SPCC) Plan <br />A SPCC Plan has been prepared for this site (Sunday Mines SPCC Plan, URS Corporation, <br />December 2007). <br />Denison Mines (USA) Corp. Sunday Mines SWMP