PTAP-21 Napa County Final Report 2020-21 Pavement Management Program Update March 17, 2021 Prepared by: The preparation of this report has been financed in part by grants from the Federal Highway Administration, U.S. Department of Transportation. The contents of this report do not necessarily reflect the official views or policy of the U.S. Department of Transportation. TABLE OF CONTENTS List of Tables and Figures ...................................................................................................................... ii Acronyms & Abbreviations .................................................................................................................. iii I. Executive Summary ............................................................................................................................ 1 II. Background ....................................................................................................................................... 2 III. Introduction and Purpose ................................................................................................................. 3 IV. Network Description and Inventory ................................................................................................ 4 V. Existing Pavement Condition ............................................................................................................ 5 VI. Pavement Management Strategies ................................................................................................... 7 VII. Budget Needs ............................................................................................................................... 11 VIII. Budget Analysis/Scenarios.......................................................................................................... 12 A. No Funds ($0) ..................................................................................................................... 14 B. Expected Annual Budget (Various Annual Budgets) ................................................................ 15 C. Maintain PCI of 45 ($12.5M) .................................................................................................... 16 D. Five Point Increase in PCI ($15M) ........................................................................................... 17 E. Budget Needs Average ($35M) ................................................................................................. 18 F. Residentials PCI = 60; Arterials/Collectors PCI = 70 ............................................................... 19 IX. Recommendations .......................................................................................................................... 24 A. Limits of Study ................................................................................................................... 24 B. Maintenance Strategy Development ................................................................................... 25 C. Annual Budget Projects ...................................................................................................... 25 D. Maintenance Strategy Assignments .................................................................................... 25 E. Maintenance Decisions ....................................................................................................... 31 F. Pavement Management Program Reports ........................................................................... 32 G. System Maintenance ........................................................................................................... 32 X. Conclusion ...................................................................................................................................... 32 A. Program Budget Options .................................................................................................... 32 B. PMP Suggestions ................................................................................................................ 33 C. Next Steps ........................................................................................................................... 34 Appendix I – Pavement Condition Index & Remaining Service Life Section PCI/RSL Listing Report Appendix II - Budget Analysis Report A. Budget Needs Report and Treatment Cost Details– Ten Years B. Average PCI by Annual Funding Chart C. Deferred Maintenance Cost Trend by Annual Funding Chart D. Budget Scenario Cost and Network Condition Summaries E. Annual Work Program I (Various Annual Budgets) F. Annual Work Program II (Residentials PCI = 60, Arterials/Collectors PCI= 70) Appendix III - Backup Data A. Section Description Inventory Report B. Inventory of Applied Maintenance C. Maintenance Treatment Decision Tree i LIST OF TABLES Page Table 1 Historical PCI Trends ............................................................................................................... 3 Table 2 Pavement Mileage by Functional Class .................................................................................... 4 Table 3 PCI Breakdown Descriptions .................................................................................................... 5 Table 4 PCI by Functional Class............................................................................................................ 6 Table 5 Percentage of Network Area by Functional Class and Condition Category ............................. 7 Table 6 Agency’s Maintenance Treatments by Condition Category ................................................... 10 Table 7 Network Replacement Value .................................................................................................. 10 Table 8 Budget Needs Analysis ........................................................................................................... 11 LIST OF FIGURES Figure 1 Pavement Condition Index by Annual Funding Level ............................................................ 1 Figure 2 Percentage of Network by Functional Class ............................................................................ 4 Figure 3 Alligator Cracking Deduct Curve ............................................................................................ 6 Figure 4 Centerline Miles of Road by Condition ................................................................................... 7 Figure 5 Pavement Management – Applying Cost Effective Treatment ............................................... 8 Figure 6 Maintenance Activities and PCI .............................................................................................. 9 Figure 7 PCI Chart ............................................................................................................................... 21 Figure 8 Deferred Maintenance Chart ................................................................................................. 22 Figure 9 PCI and Deferred Maintenance Chart ................................................................................... 23 Figure 10 Pavement Condition Changes Under Budget Scenarios ...................................................... 24 ii ACRONYMS & ABBREVIATIONS AC: Asphalt Concrete CIP: Capital Improvement Plan DBE: Disadvantage Business Enterprise DM: Deferred Maintenance FC: Functional Classification FDR: Full Depth Reclamation FHWA: Federal Highway Administration GASB: Governmental Accounting Standards Board GIS: Geographic Information System HMAC: Hot Mix Asphalt Concrete MS: Microsurfacing MTC: Metropolitan Transmission Commission OL: Overlay PCC: Portland Cement Concrete PCI: Pavement Condition Index PM: Preventative Maintenance PMP: Pavement Management Program PTAP: Pavement Technical Assistance Program ST: Surface Type iii PTAP-21 – Napa County 2020-21 Pavement Management Program Update Final Report – March 17, 2021 I. EXECUTIVE SUMMARY In October to December of 2020, Harris & Associates updated the Pavement Management Program (PMP) for the County of Napa under a contract with the Metropolitan Transportation Commission (MTC) of the San Francisco Bay Area for their Pavement Technical Assistance Program (PTAP), Round 21. The County has a total approximately 411 centerline miles and 826 total lane miles in their entire road network. For this update, a total of 333 centerline miles were surveyed as part of the PTAP-21 project and an additional 55 centerline miles were surveyed as part of a direct contract with the County. Roads that received maintenance within the past two years (approximately 5 centerline miles), roads with planned maintenance (approximately 27 centerline miles), and gravel roads (approximately 8 centerline miles) were not included in the field distress surveys. The PMP provides a management tool to inventory road pavement, assess pavement condition, record historical maintenance, forecast budget needs, and view impacts of funding on Countywide pavement condition over time. After the condition survey, the Countywide average Pavement Condition Index (PCI) is currently at a 45. The overall condition of Napa County’s road network rests in the “Poor” condition range. For the County of Napa, the following six annual budget scenarios were generated with 12% of the annual budget applied towards preventative maintenance. 1. No Funds ($0) 2. Expected Annual Budget (Various Annual Budgets) 3. Maintain PCI of 45 ($12.5M) 4. Five Point Increase in PCI ($15M) 5. Budget Needs Average ($35M) 6. Residentials PCI = 60, Arterials/Collectors