108 Thin Blanket II

108 Thin Blanket II

The California Department of Transportation Is proposing to construct a thin blanket overlay on Stale Route (SR) 108 In Mono County near Sonora Junction from the Tuolumne/Mono County line to 5.3 miles west of United Slates (US) Route 395 (Fig. 1). The work includes grinding out and replacing a 2' wide by 3" deep section of unstable Hot Mix Asphalt (HMA) and dirt shoulder for the entire project limits. Work is located 10' from center line, through the dirt shoulder, for east and westbound traffic lanes. Failed pavement areas within the traveled way will be dug out and replaced and then a 0.15' thin lift of HMA will be placed from edge of pavement (EP) to EP from the beginning to end of the project limits. A 1' wide section of shoulder backing will be placed (as shown on the cross section; Appendix A) and the new pavement markings will be placed. Two demonstration toad crossings will be constructed at Upper Sardine Meadows. The purpose of these structures Is to facilitate Yosemite toad movement across and under SR 108 between portions of Upper Sardine Meadows. If utilized by Yosemite toads, these structures will potentially reduce traffic related Yosemite toad mortality and Increase habitat connectivity. These under crossings will be built using modified culvert and cattleguard designs. All work will be performed from the roadway and within the existing Caltrans ROW with no new additions lo the highway, except for the two crossing structures. Several existing dirt pullouts are proposed as construction staging areas.

Walker; Bridgeport

Mono

California Air Resources Board (ARB), California Department of Conservation (DOC), California Department of Fish and Wildlife, Inland Deserts Region 6 (CDFW), California Department of Forestry and Fire Protection (CAL FIRE), California Department of Parks and Recreation, California Department of Transportation, District 9 (DOT), California Department of Water Resources (DWR), California Highway Patrol (CHP), California Native American Heritage Commission (NAHC), California Natural Resources Agency, California Public Utilities Commission (CPUC), California Regional Water Quality Control Board, Lahontan South Lake Tahoe Region 6 (RWQCB), Department of Toxic Substances Control, Office of Historic Preservation, State Water Resources Control Board, Division of Drinking Water

Transportation (Highway Maintenance)

Biological Resources, Wetland/Riparian