Marin County Parks and Open Space began work on Monday to restore and decommission over 4,000 linear feet of unsanctioned trails in San Geronimo Valley’s Gary Giacomini Preserve, the largest preserve in West Marin at 1,500 acres. The project figures into the county’s Road and Trail Management Plan, which aims to designate a large swath of open space trails for hiker, biker and equestrian use and has sparked the ire of some residents who feel the county is unfairly catering to cyclists. Along with decommissioning two trails—Kneecap Trail and Green Hill Road—the county plans to adopt and improve 14,017 feet of existing unsanctioned trails and historic abandoned roads. Those trails—the Contour, Vista Hamaca, Sinaloa Trail, Wiggler and Candalero Canyon Trails—will be restored through re-grading, berm removal and narrowing. The work will also aim to reduce sedimentation caused by unsanctioned trail construction and historic logging roads, as well as restore over 8,000 square feet of manzanita and redwood forest habitat. The county hopes to reduce water-quality impacts to nearby watercourses, improve trails to reduce conflicts between users and increase public safety. Trails not slated for decommissioning will be open to hikers and bicyclists only, with the exception of the Contour Trail, which will also be open to equestrians. With work completed, the county expects the touched-up trails to “establish a trail system that is better for wildlife and visitors exploring the serpentine-laced, chaparral-covered ridges .” The project is slated to coincide with restoration work at Roy’s Redwoods and other preserves, all of which is funded with Measure A user-tax and retail-sales monies. Work is expected to wrap up Oct. 15, with trail closures Monday through Friday from 7 a.m. to 4:30 p.m. while crews are working.