EA 01-0J93U_SR 29 PM 15.26-18.43 Twin Lakes CAPM & Left Turn Channelization (Streambed Alteration Agreement EPIMS Notification No. LAK-57517-R2)

The California Department of Transportation is executing the Twin Lakes CAPM and Left Turn Channelization project along State Route 29 in Lake County, California. This project, which falls under Streambed Alteration Agreement EPIMS Notification Number LAK-57517-R2, is part of a larger capital maintenance effort involving roadway pavement rehabilitation and drainage system improvements. The specific scope of work is limited to culvert operations at three distinct locations between post mile 15.26 and 18.43, involving Harris Creek, Copsey Creek, and an unnamed stream. Key tasks include upsizing a corrugated steel pipe at PM 15.26 with new flared end sections and rock slope protection, as well as performing in-kind replacements of existing steel pipes and flared end sections at PM 16.44 and PM 18.43. The project has been granted a categorical exemption by the California Department of Fish and Wildlife because it involves the replacement and repair of existing facilities to meet current standards. Environmental protections are strictly mandated, requiring that any riparian vegetation removal be conducted with hand tools or heavy equipment that must remain on the roadway prism to avoid damaging stream and riparian habitats. Additionally, if flowing or standing water is present, contractors may be required to implement dewatering and temporary clear water diversions prior to performing any in-channel work. The project is overseen by the California Department of Transportation with environmental coordination provided by the California Department of Fish and Wildlife.