108 Thin Blanket II

2 Documents in Project


SCH Number
Lead Agency
California Department of Transportation, District 9 (DOT)
Document Title
108 Thin Blanket II
Document Type
MND - Mitigated Negative Declaration
Present Land Use
US Forest Service - Humboldt-Toiyabe National Forest
Document Description
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.

Contact Information

Kristopher Bason
Agency Name
CA Department of Transportation (Caltrans)
Contact Types
Lead/Public Agency

Agency Name
CA Department of Transportation (Caltrans)
Contact Types
Project Applicant


Walker; Bridgeport
State Highways

Notice of Completion

State Review Period Start
State Review Period End
State Reviewing Agencies
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
Development Types
Transportation (Highway Maintenance)
Project Issues
Biological Resources, Wetland/Riparian


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