ROADWAY DESIGN AND CONSTRUCTION STANDARDS

Transcription

1 ROADWAY DESIGN AND CONSTRUCTION STANDARDS Adopted: 1990 Amended:

2 ROADWAY DESIGN AND CONSTRUCTION STANDARDS ORIGINALLY ADOPTED IN 1990 Resolution No. R OFFICIALLY AMENDED IN 1994 OFFICIALLY AMENDED IN 2003 Resolution No. R (Minor Changes concern Traffic Signal Specifications and Signage and Striping Supplement) OFFICIALLY AMENDED IN 2011 Resolution No. R (Adoption of new Rural Local Roadway Design and Technical Criteria) OFFICIALLY AMENDED IN 2013 Motion No. M (Major revisions to Chapters 1, 2, 3, 4, 7, 11, 13, 14, 15, 16 and Appendix A)

3 DOUGLAS COUNTY, COLORADO ACKNOWLEDGEMENTS THE BOARD OF COUNTY COMMISSIONERS OF THE COUNTY OF DOUGLAS, COLORADO Jack Hilbert Roger Partridge Jill Repella PUBLIC WORKS ENGINEERING DIRECTOR Frederick H. Koch, P.E. PREPARED BY Department of Public Works Engineering Engineering Division

4 TABLE OF CONTENTS CHAPTER SECTION TITLE PAGE 1 General Provision 1.1 SHORT TITLE ENACTMENT AUTHORITY JURISDICTION PURPOSE AMENDMENT AND REVISIONS ENFORCEMENT RESPONSIBILITY REVIEW AND ACCEPTANCE INTERPRETATION VARIANCES ABBREVIATIONS Submittal Procedures 2.1 DRAWING AND SPECIFICATIONS SUBMITTAL 2-1 PROCEDURE Procedures and Requirements Presubmittal Meetings Construction Documents Engineering Review Objective Results of Engineering Review Revision of Engineering Plans and Reports REVISIONS TO ACCEPTED PLANS Acceptance Period Updates and Revisions SUBMITTAL CHECKLIST DRAFTING STANDARDS Submittal Requirements for Construction Documents 3.1 GENERAL COVER SHEET Vicinity Map Sheet Index Standard Notes Acceptance Block Engineering Certification Note Title Block Project Title Contacts For Project Benchmark And Basis Of Bearing Overall Key Map REQUIREMENTS FOR CONSTRUCTION PLANS Scale North Arrow Stationing Date Of Plan Seal And Signature Utilities Key Map 3-10

5 TABLE OF CONTENTS CHAPTER SECTION TITLE PAGE 3.4 REQUIREMENTS FOR STREET PLANS Plan View Profile REQUIREMENTS FOR DRAINAGE AND 3-13 STORMWATER MANAGEMENT FACILITY PLANS Storm Sewer And Culverts Open Channels And Channel Stabilization Detention/Storage Facilities Water Quality Facilities not associated with 3-15 Detention/Storage Facilities 3.6 REQUIREMENTS FOR GRADING, EROSION AND 3-16 SEDIMENT CONTROL (GESC) PLAN 3.7 REQUIREMENTS FOR SIGNAGE AND STRIPING 3-16 PLANS Submittal Review Process General Provisions The Signage Plan should: The Striping Plan must show: Douglas County Signing and Striping 3-17 Supplement Plan Sheets 3.8 REQUIREMENTS FOR TRAFFIC SIGNAL PLANS Submittal Review Process General Provisions Pole and Mast Arm loading The Traffic Signal Plan shall: Traffic Signal Details and Notes REQUIREMENTS FOR LANDSCAPING PLANS 3-19 WITHIN COUNTY ROW OR OTHER COUNTY PROPERTIES OR EASEMENTS Guidelines Plans Landscape Notes REQUIREMENTS FOR CONSTRUCTION PLANS 3-21 FOR MULTI-FAMILY SITE IMPROVEMENT PLANS 3.11 REQUIREMENTS FOR CONSTRUCTION PLANS FOR 3-22 NON-RESIDENTIAL SITE PLANS 3.12 REQUIREMENTS FOR CONSTRUCTION PLANS FOR 3-22 SINGLE FAMILY RESIDENTIAL DEVELOPMENT 3.13 REQUIREMENTS FOR OVERALL UTILITY PLAN REQUIREMENTS FOR UTILITY CONSTRUCTION 3-23 PLANS Utility Plan Sheets REQUIREMENTS FOR DETAIL SHEETS REQUIREMENTS FOR ROADWAY CONSTRUCTION 3-23 PLANS FOR 35-ACRE LAND SURVEY PLATS 3.17 RANGE POINTS - PROPERTY MONUMENTS

6 TABLE OF CONTENTS CHAPTER SECTION TITLE PAGE BENCHMARKS 3.18 VARIANCES AND APPEALS General Appeal of Variance Denial ALTERNATE ROADWAY STANDARDS Roadway Design and Technical Criteria 4.1 GENERAL ROADWAY DESIGN AND TECHNICAL CRITERIA ENGINEERING DESIGN & TECHNICAL CRITERIA Cul De-Sac Urban Local (Type I) Urban Local (Type II) Entry Street Commercial And Industrial Urban Collector Minor Arterial Major Arterial (4-Lane And 6-Lane) Rural Local (Type I) Rural Local (Type II) Rural Local (Type III) Rural Local (Type IV) Rural Collector Rural Arterial (2 Lane And 4 Lane) Acre Private Rural Road SIDEWALKS, TRAILS & CURB RAMPS CURB CUTS & DRIVEWAYS DRAINAGE Crosspans Inlets Sidewalk Chases Trench Drains Rural Roadside Ditches Temporary Erosion and Sediment Control HORIZONTAL ALIGNMENT General Horizontal Curves Intersection Curb Return Radii Design Speed Superelevation Railroad Crossings VERTICAL ALIGNMENT Permissible Roadway Grades(See also 4-52 Sight Distance on Vertical Curves ) Permissible Intersection Grades Cross Slope Grade Breaks and Vertical Curves INTERSECTIONS 4-59

7 TABLE OF CONTENTS CHAPTER SECTION TITLE PAGE Curb Returns Connection with Existing Roadways Intersection Warping ROUNDABOUTS General Guidelines Feasibility Analysis Design SIGHT DISTANCE Sight Distance on Horizontal Curves Stopping Sight Distance Passing Sight Distance Intersection and Driveway Sight Distance Sight Distance on Vertical Curves OFF-SITE DESIGN AUXILIARY LANES BUS PULLOUT LANES RAISED MEDIANS Median Islands RIGHT-OF-WAY MAINTENANCE Pavement Design and Technical Criteria 6 Bridges and Major Drainage Structures 7 As-Built Drawings 7.1 CRITERIA Roadway Inspection and Testing Procedures and Construction Guidelines 9 Trench Backfill Compaction 10 Permit Procedures and Bonding Requirements for Contractor 11 Acceptance Procedures and Requirements 11.1 APPLICATION OF STANDARDS GENERAL POLICIES PRELIMINARY ACCEPTANCE PROCESS Terms of Maintenance Responsibility Acceptance Inspection Scheduling Changes to Acceptance 11-3 Inspection Date Notification of Deficiencies Reinspections Granting Preliminary Acceptance Denial of Preliminary Acceptance Warranty Security 11-4

8 TABLE OF CONTENTS CHAPTER SECTION TITLE PAGE 11.4 FINAL ACCEPTANCE PROCESS ACCEPTANCE OF ROADWAYS BY A SPECIAL 11-5 DISTRICT OR OTHER QUASI-GOVERNMENTAL AGENCY TO BE ACCEPTED BY DOUGLAS COUNTY 12 Utility Locations 13 Access Requirements and Criteria 13.1 GENERAL APPLICATION PROCESS CRITERIA FOR ACCESS ONTO ROADS WITHIN 13-1 DOUGLAS COUNTY Freeways State Highways Major Arterials Private Access Public Access Minor Arterials Private Access Public Access Urban Collectors School Access Street Commercial and Industrial Street Entry Streets Local Streets BASIC PRINCIPLES FOR CURB OPENINGS AND 13-8 DRIVEWAYS 13.4 PRIVATE DRIVE ACCESS TO RURAL ROADWAYS GENERAL REQUIREMENTS Number of Driveway Openings Driveway Entrance Angle Joint Driveway Access Minimum Space Between Driveway Openings (D) Driveway Movements Change In Use Or Traffic Volume Auxiliary Lanes (Acceleration/Deceleration Lanes) 13.6 ACCESS DESIGN Width of Driveway Opening (W) Driveway Edge Clearance (E) Corner Clearance (C) Sight Distance UNPERMITTED ACCESS Improvement Agreements and Exhibits 14.1 GENERAL IMPROVEMENT AGREEMENTS FOR SUBDIVISIONS Subdivision Improvements Agreement (SIA) 14-1

9 TABLE OF CONTENTS CHAPTER SECTION TITLE PAGE Subdivision Improvements Agreement for 14-1 Private Development (SIA-Private) Public Improvements Agreement (PIA) IMPROVEMENT AGREEMENTS FOR SITE 14-1 IMPROVEMENT PLANS 14.4 IMPROVEMENT AGREEMENTS FOR OTHER 14-1 DEVELOPMENTS 14.5 COST ESTIMATE EXHIBITS PHASING PLAN FOR SIA AND SIA-PRIVATE Phasing Considerations Plan Requirements Private Roads 15.1 COUNTY REQUIREMENTS GENERAL APPLICATION PRIVATE IMPROVEMENTS PRIVATE ROADWAY STANDARDS PAVEMENT DESIGN / ROADWAY CONSTRUCTION COST ESTIMATE AND IMPROVEMENT AGREEMENT INSPECTION REQUIREMENTS WARRANTY REQUIREMENTS Forms 16.1 GENERAL DOUGLAS COUNTY ENGINEERING DIVISION 16-1 SUBMITTAL FORM 16.3 SUBDIVISION IMPROVEMENTS AGREEMENT SUBDIVISION IMPROVEMENTS AGREEMENT FOR 16-1 PRIVATE DEVELOPMENT 16.5 SITE IMPROVEMENT PLAN IMPROVEMENTS 16-1 AGREEMENT 16.6 PUBLIC IMPROVEMENTS AGREEMENT ENGINEERING COST ESTIMATES GRADING, EROSION AND SEDIMENT CONTROL 16-2 PERMIT APPLICATION 16.9 LOW IMPACT GRADING, EROSION AND 16-2 SEDIMENT CONTROL PERMIT APPLICATION FLOODPLAIN DEVELOPMENT PERMIT PERMANENT ACCESS PERMIT TEMPORARY ACCESS PERMIT RIGHT OF WAY USE AND/OR CONSTRUCTION PERMIT ASPHALT MIX DESIGN SUBMITTAL FORM OVERSIZE/OVERWEIGHT PERMIT TEMPORARY BATCH PLANT/GRADING, EROSION AND 16-4 SEDIMENT CONTROL PERMIT APPLICATION ASSIGNMENT OF SUBDIVISION IMPROVEMENTS 16-4 AGREEMENT AND DEVELOPMENT RIGHTS NOTICE OF CHANGE TO APPROVED DESIGN 16-4

10 TABLE OF CONTENTS CHAPTER SECTION TITLE PAGE REQUEST FOR INITIAL WARRANTY ACCEPTANCE REQUEST FOR FULL TERM MAINTENANCE REQUEST FOR INITIAL WARRANTY ACCEPTANCE 16-4 OF PRIVATE IMPROVEMENTS REQUEST FOR FINAL RELEASE OF SECURITY 16-4 FOR PRIVATE IMPROVEMENTS STATE HIGHWAY ACCESS PERMIT RETAINING WALL PERMIT 16-4

11 TABLE OF CONTENTS APPENDICIES APPENDIX A APPENDIX B APPENDIX C APPENDIX D APPENDIX E APPENDIX F APPENDIX G TITLE STANDARD PLATES GUIDELINES FOR TRAFFIC IMPACT STUDIES GUIDELINES FOR TRAFFIC CONTROL DURING CONSTRUCTION (Document pending - contact Douglas County Permits/Inspection Office for details) CONSTRUCTION SPECIFICATION TOLERANCES DENVER/COLORADO/SWELL-CONSOLIDATION TEST TRAFFIC SIGNAL SPECIFICATIONS SIGNAGE & STRIPING SUPPLEMENT

12 LIST OF TABLES TABLE DESCRIPTION PAGE 4-1 SUMMARY OF ROADWAY CONSTRUCTION STANDARDS 4-2, 4-3, 4-4, PERMISSIBLE INTERSECTION GRADE TABLE STOPPING AND PASSING SIGHT DISTANCE BUS PULLOUT LANES Subgrade Investigation and Pavement Design Checklist Recommended Equivalent (1 8 Kip) Daily Load Applications (EDLA) Serviceability Index Recommended Minimum Pavement Sections Strength Coefficients Nomograph for Flexible Pavement Design with SI = Nomograph for Flexible Pavement Design with SI = Nomograph for Rigid Pavement Design with SI = Nomograph for Rigid Pavement Design with SI= Material Specifications for Hot Bituminous Pavement Mix Tolerances Mix Design Criteria a Minimum Voids in the Mineral Aggregate (VMA), Percent Fine Aggregates for Portland Cement Concrete Coarse Aggregates for Portland Cement Concrete Aggregate Base Course Materials Class 1 Structural Backfill Concrete Materials Specifications Concrete Aggregate Gradation Table Percentages Passing Designated 6.5 Sieves and Nominal Size Designation

13 LIST OF TABLES TABLE DESCRIPTION PAGE 6.4 Gradation Specifications for Filter Material Recommended Filter Class Classification and Gradation of Ordinary Riprap Testing Frequency Moisture-Density Control Gradation of Subbase Material Gradation of Limits of Base Material WIDTH OF DRIVEWAY OPENINGS 13-12

14 LIST OF FIGURES FIGURE DESCRIPTION PAGE 3-1 ACCEPTANCE BLOCK a ACCEPTANCE BLOCK FOR SIGNAGE AND STRIPING & TRAFFIC 3-6 SIGNAL PLANS 3-1b ACCEPTANCE BLOCK FOR 35-ACRE LAND SURVEY PLATS TITLE BLOCK LAYOUT OVERALL KEY MAP KEY MAP URBAN TURNAROUNDS RURAL TURNAROUNDS OFFSET TURNAROUNDS KNUCKLES EYEBROWS SUMP INLET PROFILE FLOWLINE GRADE AROUND CURVES a FLOWLINE DESIGN AROUND KNUCKLES b FLOWLINE DESIGN AROUND EYEBROWS PERMISSIBLE INTERSECTION GRADE LAYOUT PERMISSIBLE INTERSECTION GRADE EXAMPLE CROSS SLOPE EXAMPLE VERTICAL CURVE EXAMPLES PERMISSIBLE INTERSECTION ANGLE CURB RETURN EXAMPLES LATERAL CLEARANCE TO SIGHT OBSTRUCTION INSIDE OF 4-66 HORIZONTAL CURVES PROVIDING STOPPING DISTANCE FOR TURNING ROADWAYS

15 LIST OF FIGURES FIGURE DESCRIPTION PAGE 4-15 INTERSECTION AND DRIVEWAY SIGHT DISTANCE 4-68 (LINE-OF-SIGHT TRIANGLE) 4-16 SCALING AND RECORDING SIGHT DISTANCE ON PLANS BUS PULLOUT LANE MEDIAN AT INTERSECTION INTERSECTION STRIPING OPTION FOR SINGLE LEFT TURN INTERSECTION STRIPING OPTION FOR DUAL LEFT TURN Gradation of Ordinary Riprap a Trenching Detail b Trenching Detail Notes Letter of Responsibility Utility Line Location General Utility Location General Utility Location General INTERSECTION SEPERATION FOR ENTRY STREET 13-7 AND LOCAL STREETS 13-2 MINIMUM DRIVEWAY DIMENSIONS BASED ON REQUIRED CULVERT SIZE 13-3 CURB OPENINGS AND DRIVEWAY SPACING CORNER CLEARANCES FOR NON SINGLE FAMILY DRIVEWAYS 13-15

16 REFERENCES 1. Douglas County Subdivision Resolution, 2010, Douglas County Planning Division 2. A Policy on Geometric Design of Highway and Streets, 6 th Revision, 2011, American Association of State Highway and Transportation Officials 3. Douglas County Storm Drainage Design and Technical Criteria, 2008, Douglas County Engineering Division 4. Standard Specifications for Road and Bridge Construction, 2011, Colorado Department of Transportation 5. Transportation Standards and Details for the Engineering Division, 2010 City and County of Denver Public Works 6. Infrastructure Design and Construction Standards, 2007, Arapahoe County Department of Public Works and Development 7. Urban Storm Drainage Criteria Manual, Vol. 1, 2 & 3, July 2001, Urban Drainage and Flood Control District 8. Manual on Uniform Traffic Control Devices for Streets and Highways, 2009 Edition, U.S Department of Transportation, Federal Highway Administration 9. Standard Specifications for Highway Bridges, 17 th Edition, American Association of State Highway and Transportation Officials 10. State of Colorado State Highway Access Code, Volume 2, Code of Colorado Regulations, 601-1, 2002 Colorado Department of Transportation 11. Highway Capacity Manual, 2000, Transportation Research Board National Research Council 12. Trip Generation, 8 th Edition, Institute of Transportation Engineers 13. American Society for Testing and Material 14. National Fire Protection Association NFPA -13D, Douglas County Grading, Erosion and Sediment Control (GESC) Manual, 2004, Douglas County Engineering Division 16. CDOT Roadway Design Guide, 2005, Colorado Department of Transportation 17. CDOT M-Standards, 2006, Colorado Department of Transportation 18. CDOT Traffic S-Standard Plans, 2006, Colorado Department of Transportation 19. Roadside Design Guide, 4 th Edition, 2011, American Association of State Highway and Transportation Officials 20. Douglas County Zoning Resolution, 2010, Douglas County Planning Division

17 REFERENCES 21. Guidelines for Geometric Design of Very Low-Volume Local Roads (ADT<400), 2001, American Association of State Highway and Transportation Officials