SON 116 Safety Improvement and Drainage Upgrade


SCH Number
Public Agency
California Department of Transportation, District 4 (DOT)
Document Title
SON 116 Safety Improvement and Drainage Upgrade
Document Type
NOE - Notice of Exemption
Document Description
This section of SR 116 is a two-lane highway (one lane in each direction). At Post Mile (PM) 28.50, the existing roadside ditch on the north side of the highway has a slope of approximately 1H:1V (horizontal : vertical) and is up to 5 feet in depth, the existing guardrail is not sufficient to prevent vehicles from running off the road into the ditch. Current accident data at this location indicates that the guardrail has been hit repeatedly by traffic traveling westbound. Field investigations and internal discussions determined that continued repair and installation of guardrail will not alleviate the ongoing collision issue. Traffic safety recommends extending the RCB culvert approximately 35 feet to the west and widening the paved roadway section in this area to give drivers more time to turn into the lane from the adjoining side-street. In addition, it is proposed to dredge 300 feet of the existing unlined ditch to its original flowline to remove sedimentation and facilitate proper drainage. These modifications will maintain the integrity of the roadway and enhance driver safety.

Contact Information

Agency Name
Job Title
Environmental Planner
Contact Types
Lead/Public Agency


State Highways
Sonoma 101

Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
15301 Class 1 (c)
Reasons for Exemption
Class 1 consists of the operation, repair, maintenance, permitting, leasing, licensing, or minor alteration of existing public or private structures, facilities, mechanical equipment, or topographical features, involving negligible or no expansion of existing or former use. The types of "existing facilities" itemized below are not intended to be all-inclusive of the types of projects which might fall within Class 1. Subsection (d) includes existing highways and streets, sidewalks, gutters, bicycle and pedestrian trails, and similar facilities.
County Clerk


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