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Paleontological Technical Report for the 6Th Avenue

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Paleontological Technical Report for the 6Th Avenue Appendix A11 PALEONTOLOGICAL TECHNICAL REPORT FOR THE 6TH AVENUE EXTENSION ENVIRONMENTAL ASSESSMENT Prepared for: FELSBURG HOLT AND ULLEVIG 6300 South Syracuse Way Suite 600 Centennial, CO 80111 Prepared by: ROCKY MOUNTAIN PALEO SOLUTIONS 1216 East 10th Avenue Denver, CO 80218 303-514-1095 Principal Investigator: Paul C. Murphey, Ph.D. State of Colorado Paleontological Permit No. 2015-55 RMPS Report No. CO15ArapahoeFHU01R Kate D. Zubin Stathopoulos, M.S., and Paul C. Murphey, Ph.D. June 2016 Felsburg Holt & Ullevig 6th Avenue Parkway Extension Project CONTENTS 1.0 Introduction ............................................................................................................................. 1 2.0 Definition and Significance of Paleontological Resources ................................................... 4 3.0 Laws, Ordinances, Regulations, and Standards .................................................................. 7 3.1 Federal ...................................................................................................................................... 7 3.2 State ........................................................................................................................................... 9 3.3 County ........................................................................................................................................ 9 3.4 City ............................................................................................................................................. 9 3.5 Private Lands .............................................................................................................................. 9 4.0 Methods .................................................................................................................................. 10 4.1 Analysis of Existing Data Methods ............................................................................................ 10 4.2 Personnel ................................................................................................................................. 10 4.3 Field Survey Methods .............................................................................................................. 10 4.4 Distribution of Data ................................................................................................................ 11 5.0 Literature Research Results ................................................................................................. 12 5.1 Geology and Paleontology ....................................................................................................... 12 5.1.1. Denver Formation (Tkd) ........................................................................................................... 13 5.1.2. Louviers Alluvium (Qlo) .......................................................................................................... 14 5.1.3. Broadway Alluvium (Qb) ......................................................................................................... 14 5.1.4. Windblown Sand (Qes) ............................................................................................................. 14 5.1.5. Post-Piney Creek and Piney Creek Alluvium ........................................................................... 14 6.0 Record Search Results .......................................................................................................... 15 7.0 Field Survey Results ............................................................................................................. 16 8.0 Recommendations ................................................................................................................. 28 9.0 References .............................................................................................................................. 29 RMPS Report No. CO14ArapahoeFHU01R i Felsburg Holt & Ullevig 6th Avenue Parkway Extension Project FIGURES Figure 1. Proposed Action and Study Area .............................................................................................. 3 Figure 2. Overview Map of the Proposed Action Study Area. ................................................................. 5 Figure 3. Overview of the Proposed Action study area showing alternatives and geology. Survey areas indicated on the map correspond to survey summary tables (see Tables 4-11). ............ 17 Figure 4. Overview of the Proposed Action study area showing additions to Alternative 2A surveyed on October 20, 2015 with geology. .......................................................................... 18 TABLES Table 1. Project Summary ....................................................................................................................... 6 Table 2. Geologic Units within the Project Area ................................................................................... 12 Table 3. Previously Recorded Fossil Localities within the Same Township as the Project Area ......... 15 Table 4. Overlapping Portions of Alternatives 1A, 2A, 4A and 4B ...................................................... 19 Table 5. Alternative 1A (see Figure 3 for Photo Point Locations) ........................................................ 20 Table 6. Alternative 2A (see Figure 3 for Photo Point Locations) ........................................................ 21 Table 7. Alternative 4A (see Figure 3 for Photo Point Locations) ........................................................ 22 Table 8. Alternative 4B (see Figure 3 for Photo Point Locations) ........................................................ 23 Table 9. Overlapping Portions of Alternatives 4A and 4B .................................................................... 24 Table 10. Overlapping Portions of Alternatives 1A and 2A ................................................................... 25 Table 11. Overlapping Portions of Alternatives 1A, 2A and 4B ............................................................. 26 Table 12. Additions to Alternative 2A .................................................................................................... 27 APPENDICES Appendix A. Copy of the State of Colorado Paleontological Permit........................................................ A-1 Appendix B. Resource Impact Table ........................................................................................................ B-1 Appendix C. Resource Mitigation Table .................................................................................................. C-1 RMPS Report No. CO14ArapahoeFHU01R ii Felsburg Holt & Ullevig 6th Avenue Parkway Extension Project LIST OF ACRONYMS ARPA ................. Archaeological Resources Protection Act BIA ..................... Bureau of Indian Affairs BLM ................... Bureau of Land Management BOR ................... Bureau of Reclamation CDOT ................. Colorado Department of Transportation CFR .................... Code of Federal Regulations CHPA ................. Colorado Historical, Prehistorical and Archaeological Resources Act DMNS ................ Denver Museum of Nature and Science DOI .................... Department of Interior E-470 ................. E-470 Tollway EA ...................... Environmental Assessment FHU.................... Felsburg Holt and Ullevig FHWA ................ Federal Highway Administration FLPMA .............. Federal Land Policy and Management Act I-225 ................... Interstate 225 I-70 .................... Interstate 70 LORS ................. laws, ordinances, regulation, and standards NPS .................... National Park Service NEPA ................. National Environmental Policy Act PFYC.................. Potential Fossil Yield Classification PLSS .................. Public Land Survey System PRPA.................. Paleontological Resources Preservation Act SH 30 ................ State Highway 30 SVP .................... Society of Vertebrate Paleontology UCM .................. University of Colorado Museum USDA ................. United States Department of Agriculture USDI .................. United States Department of Interior USFS .................. United States Forest Service USFWS .............. United States Fish and Wildlife Service USGS ................. United States Geological Survey RMPS Report No. CO14ArapahoeFHU01R iii Felsburg Holt & Ullevig 6th Avenue Parkway Extension Project 1.0 INTRODUCTION This technical report has been prepared in support of the 6th Avenue Parkway Extension Environmental Assessment (EA) extending 6th Avenue from State Highway 30 (SH 30) to the E-470 Tollway (E-470). This technical report evaluates the effects of the Proposed Action and the No Action Alternative with respect to paleontological resources. Proposed Action The Proposed Action would extend the 6th Avenue Parkway for approximately 2 miles along a new alignment, connecting existing 6th Avenue/SH 30 to the west with the existing 6th Avenue Parkway at E-470 to the east. This would close a gap in the existing major arterial street system, reducing out of direction travel and improving the efficiency and reliability of the transportation system. The Proposed Action would be a six-lane arterial roadway with a raised median and sidewalks. Six initial alternatives were developed and screened through three screening levels to identify the Proposed Action. The alternatives screening is summarized in Appendix A1 Alternatives Technical Report of the EA. Details of the Proposed
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