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IRIS <br />MITIGATION AND DESIGN, INC. <br />SCHWARTZWALDER MINE PHASE 1 - UPSTREAM CUTOFF WALL AND LOW FLOW BYPASS <br />PIPELINE - BIOLOGICAL ASSESSMENT <br />CONTENTS <br />1. EXECUTIVE SUMMARY 1 <br />1.1 Phase 1 Project Summary 1 <br />1.2 Overall Schwartzwalder Mine Clean -Up Project Summary 2 <br />1.3 Schwartzwalder Mine History 3 <br />1.4 Table of Critical Species 4 <br />2. PROJECT DESCRIPTION 5 <br />2.1 Location 5 <br />2.2 Definition of Action Area 5 <br />2.2.1 Anticipated Steps 6 <br />2.2.2 Upstream Cutoff Wall Installation 7 <br />2.2.3 Boulder Riprap and 18 -Inch Low Flow Bypass Pipeline Installation 12 <br />2.2.4 Best Management Practices (BMPs) 12 <br />2.2.5 PMJM Habitat Mitigation Plan 13 <br />2.2.6 Monitoring Plan 18 <br />3. DESCRIPTION OF THE SPECIES AND THEIR HABITAT 20 <br />3.1 Agency Responses 20 <br />3.2 Agency /Expert Consultation 21 <br />3.3 Description of Species and General PMJM habitat Requirements 22 <br />4. ENVIRONMENTAL BASELINE 23 <br />4.1 Overall Habitat Description 23 <br />4.1.1 Upland Habitat 23 <br />4.1.2 Riparian Habitat 25 <br />4.2 Habitat Description in Proposed Work Area 25 <br />4.2.1 Upland Road Crossing 26 <br />4.2.2 100 Feet Upstream from Road Crossing 26 <br />4.2.3 225 Feet Downstream from Road Crossing 27 <br />Page i August 2011 <br />