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Table of Contents
Abstract
Executive Summary
Introduction
Purpose
Of and Need For the Project
Relationship
to Other Plans
Overview
of the Alternatives
Environmentally
Preferable Alternative
Letter
From The Superintendent
Chapter I: Purpose and Need
Introduction
Purpose
Of and Need For the Project
Planning
Context
Management
Goals
Issues
and Concerns
Organization
of the Cascades Diversion Dam Removal Project Environmental Assessment
Chapter II: Alternatives
Overview
of the Alternatives
Alternative 1: No Action
Alternative 2: Complete Dam Removal
Alternative 3: Partial Dam Removal
Alternatives
Considered but Dismissed
Remove Cascades Diversion Dam and Complete
Sediment Removal
Restore Cascades Diversion Dam and
Hydroelectric Generating Facility
Replace Cascades Diversion Dam with Boulders
Remove Portions of the Dam Over Time
Combine the Removal of Cascades Diversion Dam
with the Final Phase of theEl Portal Road Improvement Project
Mitigation
Measures Common To All Action Alternatives
Sustainable Design and Aesthetics
Best Management Practices During Dam Removal
Resource-Specific Measures
Comparison
of Alternatives
Summary
of Environmental Consequences
Chapter III: Affected Environment
Introduction
Impact Topics Considered in this Plan
Impact Topics Dismissed from Further Analysis
Regional
Setting
Local
Setting – Cascades Diversion Dam Project Area
Natural
Resources
Geology, Geologic Hazards, and Soils
Hydrology, Floodplains, and Water Quality
Wetlands
Vegetation
Wildlife
Special-Status Species
Air Quality
Noise
Cultural
Resources
Overview of Human Occupation
Archeological Resources
Ethnographic Resources
Cultural Landscape, including Historic Sites
and Structures
Social
Resources
Transportation
Scenic Resources
Recreation
Orientation and Interpretation
Socioeconomics
Park Operations
Chapter IV: Environmental Consequences
Introduction
Cumulative
Impacts
Context,
Duration, Intensity, and Type of Impact
Impairment
Methodologies
Natural Resources
Cultural
Resources
Social Resources
Alternative 1 – No Action
Natural Resources
Cultural
Resources
Social Resources
Alternative 2 – Complete Dam Removal
Natural Resources
Cultural
Resources
Social Resources
Alternative 3 – Partial Dam Removal
Natural Resources
Cultural
Resources
Social Resources
Chapter V: Merced
Wild and Scenic River
Introduction
Consistency with Management
Elements of the Merced
River Plan
Chapter VI: Consultation and Coordination
Compliance History
Scoping History
Agency Consultation
Future Information
List of Agencies, Organizations, and Businesses that
Received the Cascades Diversion Dam Removal Project Environmental Assessment
Chapter VII: List of Preparers and Reviewers
Chapter VIII: Glossary
Glossary of Terms
Acronyms
Chapter IX: Bibliography
List of Figures (PDF)
I-1 Project
Location
II-1 Existing
Facilities
II-2 River
Profile Between Pohono Bridge
and Cascades Picnic Area
II-3 Alternative
2 – Complete Dam Removal
II-4 Cascades
Diversion Dam Profile
II-5 Bioengineered
Slope Protection – Schematic
II-6 Alternative
3 – Partial Dam Removal
List of Tables
II-1 Summary
Comparison of Key Features of the Alternatives
II-2 Summary
of Environmental Consequences
III-1 Turbidity
III-2 Population
by County
III-3 2000
Employment by Major Industry Sector
III-4 2000
Economic Output by County and Industry Sector
III-5 2000
Total Taxable Retail Sales by County
IV-1 Typical
Noise Levels from Heavy-Duty Equipment
Appendices
A Regulations
and Policies
B Merced
Wild and Scenic River
Section 7 Determination
C Draft
Wetland Statement of Findings for the Cascades Diversion Dam Removal Project
D Special-Status
Species Evaluation
E Projects
Included in the Cumulative Impact Analysis
Environmental
Assessment in PDF Format
Abstract
Executive Summary
Letter From The Superintendent
Table of Contents
Chapter
I: Purpose and Need
Chapter II: Alternatives
[part a | part
b | part c]
Chapter
III: Affected Environment
Chapter
IV: Environmental Consequences
Chapter
V: Merced Wild and Scenic River
Chapter
VI: Consultation and Coordination
Chapter
VII: List of Preparers and Reviewers
Chapter
VIII: Glossary
Chapter
IX: Bibliography
Appendix
A: Regulations and Policies
Appendix
B: Merced Wild and Scenic River Section 7 Determination
Appendix
C: Draft Wetland Statement of Findings for the Cascades Diversion Dam Removal
Project
Appendix
D: Special Status Species Evaluation
Appendix
E: Projects Included in the Cumulative Impact Analysis
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