Sonoma County 2026 Pavement Preservation Program

Road Work \ The Project would consist of an asphalt concrete overlay (Overlay), a Full Depth Reclamation (.FDR) with an overlay, a slurry seal, a cape seal, or a double chip seal on 21 road segments located throughout . '· l Sonoma County. Refer to Table 1: Project Roads and Proposed Work for which road segment would receive which treatment. Additional improvements to bring the Project road segments up to current standards would include replacement of metal beam guard rail. Replacement of guardrails would require removal of existing guardrails, excavation to accommodate new guardrail foundations, and installation of new guardrail. Excavation required would be minimal and limited to where existing guardrail foundations were removed within the existing right of way. Water Quality Work As part of the Project, shoulder maintenance would involve mowing and/or clearing to remove accumulated vegetation sediment, and debris in existing roadside ditches to restore contours and reestablish flow lines. All areas to be cleaned are located within the existing right of way. In some areas, only mowing existing vegetation would occur. No ground disturbance would occur in mowed areas. In areas where sediment and debris are hampering drainage function, material sufficient to restore function would be removed from the area and properly disposed of. Culvert replacement would occur for select damaged or failing culverts located within Project road segments. All culvert replacement would entail excavation through the existing roadbed to the existing culvert, culvert removal, placement of a new culvert at grade, and restoration of culvert inlet and outlet to existing flow lines. Excavation would be limited to what is required for existing culvert removal and placement of the new culvert primarily within the existing roadbed. Most culverts would be replaced in-kind. Limited ground disturbance would occur at the inlet and outlet of culverts replaced in-kind to restore flow lines. Disturbance is only anticipated to extend up to five feet from the culvert inlet and outlet. Some culverts would be replaced with enlarged, elongated, and/or realigned culverts to accommodate 100-year flows. Energy dissipaters comprised of rock slope protection would be placed as needed at the outlet of upsized to culverts to accommodate the new flows, minimizing erosion and preserving water. quality. Locations with existing headways would have the headwalls replaced as needed to accommodate 100-year flows. While the Project would not require landscape improvements, tree trimming to a standard height of 15 feet would occur as necessary to provide access for construction equipment and guardrail installation. Up to four trees could be removed to facilitate the replacement of culverts on the following roads: • Walling Rd PM 11.555 • Mill Creek Road PM 17.007 • Mill Creek Road PM 18.540 • Dry Creek Road PM 12.127 Construction Construction activities .would require standard construction equipment for asphalt and concrete demolition, roadway excavation, paving, striping, and shoulder maintenance. This would include use of an excavator, paver, compactor, grader, and backhoe. Construction staging and parking would be accommodated within the Project site on paved or stabilized, flat shoulder areas within public right of way. No construction staging would occur on private property. All Project work is anticipated to occur within the existing road and right of way or in limited previously disturbed areas adjacent to culverts as required for culvert replacement. During construction, standard traffic control mechanisms would be used to maintain vehicular access on AC Overlay roadways. The FDR roadways may require detours between the hours of 8:30 AM to 5:30 PM, as the existing roadway width may not allow for traffic flow during construction.