Middle-Mile Broadband Network Project: ADF-F18-CD4-UG5; 04-25-6-BB-2014
Summary
SCH Number
2026070095
Public Agency
California Department of Transportation, District 4
(DOT)
Document Title
Middle-Mile Broadband Network Project: ADF-F18-CD4-UG5; 04-25-6-BB-2014
Document Type
NOE - Notice of Exemption
Received
Posted
7/2/2026
Document Description
American Dark Fiber, in coordination with the California Department of Technology, proposes installation of approximately 353 linear feet of new underground fiber optic infrastructure using high-density polyethylene conduit with fiber optic cable within Caltrans right-of-way along U.S. Route 101 and California State Route 1 near Mill Valley in Marin County, between Post Miles 4.013 and 4.200. The project consists of the F18 UG-5 segment of the Middle-Mile Broadband Network and includes installation of three 1.25-inch and one 2-inch diameter high-density polyethylene conduits containing fiber optic cable and two pull vaults measuring 36 inches wide by 60 inches long by 24 to 36 inches deep. Construction activities include placement of temporary traffic control devices and signage, open trenching, horizontal directional drilling or boring as needed, and installation of associated conduit, vaults, fiber optic markers, and related facilities. Trenching will generally involve excavation approximately 12 to 24 inches wide and up to 48 inches deep. Open trenches will be limited in length, and all trenches and pits will be backfilled or covered during non-working hours. Steel plates will be used as needed to maintain traffic flow at driveways and access points. All work will occur within existing Caltrans right-of-way and previously disturbed transportation corridors, including paved roadway shoulders, gravel shoulders, roadside embankments, and landscaped areas. Installation methods will be selected to avoid sensitive environmental resources and existing utilities to the extent practicable. No expansion beyond existing rights-of-way is proposed.
Contact Information
Name
Patrick Co
Agency Name
California Department of Transportation (Caltrans), District 4
Job Title
Environmental Scientist
Contact Types
Lead/Public Agency / Project Applicant
Phone
Email
Name
Zack Baayen
Agency Name
American Dark Fiber
Job Title
VP of Operations
Contact Types
Project Applicant
Phone
Location
Cities
Mill Valley
Counties
Marin
Regions
San Francisco Bay Area
State Highways
SR 1; US 101
Schools
Dr. Martin Luther King Jr. Academy; Tamalpais Valley Elementary
Other Location Info
Along U.S. Route 101 and California State Route 1 near Mill Valley in Marin County, between Post Miles 4.013 and 4.200.
Schools: Tamalpais High; Mill Valley Middle; Strawberry Point Elementary; Bel Aire Elementary
Notice of Exemption
Exempt Status
Statutory Exemption
Type, Section or Code
PRC 21080.51
Reasons for Exemption
Middle-Mile Broadband Initiative (MMBI) projects that are either installed underground or placed aerially along an existing pole in the right-of-way are exempt, under Senate Bill 156, which added section 21080.51 to the PRC.
County Clerk
Alameda
Attachments
Notice of Exemption
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