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Alternatives Analysis & Feasibility Study Prepared by: Tetra Tech RMC 1900 S. Sunset Street Suite 1-F Longmont, CO 80501 March, 2007 |
Due to the large size of this file, it has been divided into several pdf files.
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1.0 INTRODUCTION (pdf file 486 Kb)
Figure 1.1 Union Reservoir Vicinity Map (pdf file 2113 Kb)
2.0 SITE DESCRIPTION (pdf file 36 Kb)
2.1 Topographic Mapping and Surveying
2.2 Reservoir Capacity Information
Table 2.1 - Elevation Capacity Data
Figure 2.1 - Elevation Capacity Curves
3.0 GEOTECHNICAL INVESTIGATION (pdf file 57 Kb)
3.1 Regional Geology
3.2 Geotechnical Field Investigations
3.3 Geotechnical Laboratory Testing
3.4 Site Subsurface Conditions
3.4.1 Eolian Soils
3.4.2 Alluvial Sand and Gravel
3.4.3 Bedrock
3.4.4 Groundwater
Tables 3.1-3.4 Lab Test Results (pdf file 738 Kb)
Figure 3.1 Boring Location Map (pdf file 183 Kb)
Figures 3.2-3.5 Exploratory Borings - South & North Side (pdf file 385 Kb)
Figures 3.6-3.7 Exploratory Borings - East & West Side (pdf file 343 Kb)
Figures 3.11 Summary Logs of Exploratory Borings (pdf file 134 Kb)
Figures 3.12-3.14 Triaxial Stress Path; Geologic Sections (pdf file 508 Kb)
Figures 3.15-3.17 Plasticity; Investigations (pdf file 464 Kb)
4.0 HYDROLOGY (pdf file 679 Kb)
4.1 Dam Hazard Classification
4.2 Precipitation
4.3 Tributary Basin Description
4.4 Unit Hydrograph Development
4.5 Rainfall Losses
4.6 Hydrologic Modeling
Table 4.1 General Storm Depth Duration Values
Table 4.2 Local Storm Depth Duration
Table 4.3 Sub-Basin Physical Parameters
Table 4.4 Sub-Basin Composite Infiltration Rates
Figure 4.1 Tributary Sub-Basins
5.0 ALTERNATIVE ANALYSIS (pdf file 209 Kb)
5.1 Reservoir Englargements
5.2 Dam Type
5.3 Dam Section
5.3.1 Borrow
5.3.2 Typical Section
5.3.3 Stability Analysis
5.3.4 Seepage Analysis
5.4 Outlet Works
5.5 Union Reservoir Inlet Modifications
5.6 Spillway Design
5.7 Storm Drain Line
5.8 Five-Foot Enlargement Alternative
5.9 Thirteen-Foot Enlargement Alternative
5.10 Nineteen-Foot Enlargement Alternative
5.11 Reservoir Deepening and Filling of Properties West of the Reservoir
5.12 Cost Estimates
Tables 5.1-5.7 Cost Estimates
Figures 5.1-5.4 Borrow Areas; Dam Sections; Slope Stability; Seepage Analysis (pdf file 954 Kb)
Figure 5.5 - 5' Raise Baseline Option (pdf file 1039 Kb)
Figure 5.6 - 5' Raise Shoreline Option (pdf file 1049 Kb)
Figure 5.7 - 13' Raise Baseline Option (pdf file 1106 Kb)
Figure 5.8 - 13' Raise Shoreline Option (pdf file 1179 Kb)
Figure 5.9 - 19' Raise Baseline Option (pdf file 1109 Kb)
Figure 5.10 - 19' Raise Shoreline Option (pdf file 1136 Kb)
Figures 5.11-5.15 - Feasiblity Studies (pdf file 25 Kb)
6.0 NATURAL RESOURCE REGULATORY COMPLIANCE (pdf file 959 Kb)
6.1 Objectives
6.2 Methods
6.3 Findings
6.3.1 Wetlands
6.3.2 Wildlife
6.3.3 Threatened and Endangered Species
6.4 Discussion and Recommendations
6.4.1 Section 404 of the Clean Water Act
6.4.2 Endangered Species Act
6.4.3 National Environmental Policy Act
6.4.4 Migratory Bird Treaty Act
6.4.5 Summary
Table 6.1 Plant Species
Table 6.2 Wildlife Species
Table 6.3 Threatened and Endangered Species
Figure 6.1 Preliminary Wetlands Mitigation Study Areas
7.0 UNION RESERVOIR PUMP BACK PIPELINE (pdf file 854 Kb)
7.1 Project Overfiew
7.2 Pipeline and Pump Station Sizing
7.3 Pipeline Phasing
7.4 Pipeline Routing Alternatives
Figure 7.1 Concept Plan
Figure 7.2-7.3 Phasing Plan & Phase I Route Alternatives
8.0 CONCLUSIONS AND RECOMMENDATIONS (pdf file 15 Kb)
9.0 REFERENCES (pdf file 26 Kb)
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