2011-08-31_REVISION - M1977300

• Permit No: M1977300
• IBM Index Class Name: REVISION
• Doc Date: 8/31/2011
• Doc Name: Phase 1 Biological Assessment.
• From: IRIS Mitigation and Design, Inc.
• To: Cotter Corporation
• Type & Sequence: TR18
• Email Name: DB2
• Media Type: D
• Archive: No

IRIS
MITIGATION AND DESIGN, INC.
SCHWARTZWALDER MINE PHASE 1 - UPSTREAM CUTOFF WALL AND LOW FLOW BYPASS
PIPELINE - BIOLOGICAL ASSESSMENT
5. EFFECTS OF THE ACTION 28
5.1 Upstream Cutoff Wall Construction and Impacts 28
5.2 Temporary Impacts 28
5.3 Permanent Impacts 29
5.4 Bypass Diversion Pipeline, Staging and Access Area Impacts 30
5.5 Summary of Impacts 31
6. DETERMINATION OF EFFECT 34
7. REFERENCES AND PERSONAL COMMUNICATION CITED 35
TABLES
Table 1: Table of Critical Species
Table 2: Upland Seed Mix
Table 3: Transitional Area Seed Mix
Table 4: Wetland Area Seed Mix
Table 5: Temporary Seed Mix
Table 6: Upland Shrubs for Mitigation Plan
Table 7: Riparian Shrubs for Mitigation Plan
Table 8: Impact Analysis for Phase 1 — Proposed Cutoff Wall
Table 9: Impact Analysis for Phase 1 — Proposed Low Flow Bypass Pipeline and Remainder Impacts
Table 10: Impact Analysis for Phase 1 — Total Impacts
Table 11: Mitigation for Phase 1 — Total Impacts
FIGURES
Figure 1: Location Map
Figure 2: Site Map
Figure 3: Project Map
Figure 4: Upstream Cutoff Wall and Low Water Crossing Plan
Figure 5: Upstream Cutoff Wall Profile
Figure 6: Upstream Cutoff Wall Section
Figure 7: Project Impact Index Map
Page ii August 2011