Pinehurst Road Sinkhole and Culvert Repair


SCH Number
Lead Agency
Contra Costa County
Document Title
Pinehurst Road Sinkhole and Culvert Repair
Document Type
NOE - Notice of Exemption
Project Applicant
Contra Costa County Public Works Department

Document Description
The Public Works Department of Contra Costa County is proposing to repair an 84" culvert and sinkhole beneath Pinehurst Road that were heavily damaged in 2017 in order to return the road to satisfactory condition. Storm drainage will be conveyed through the culvert instead of bypassing the culvert to the side and bottom. The road embankment will be compacted and the ditch on the roadway will be restored to allow for proper drainage of surface runoff. Work will be done during the summer season when the creek is dry or has a very minimal amount of flow. Culvert repairs include the following: 1. Culvert inlet protection: Excavation of loose soils around the pipe and placement of rip rap around the inlet and on the creek bank. 2. Culvert invert repair: 1) Cleaning the silt and debris off of the pipe's flowline and disposing the sediments off-site. 2) Remove corroded pipe sections and fill all the voids beneath the pipe with grout. 3) Repair the bottom of the pipe with wire mesh and grout. The grout will be placed the full length of the pipe up to a maximum thickness of 6" to the pipe spring line. 3. Culvert outlet repair: Removal of material/debris from the creek bed adjacent to the outlet to allow for positive drainage. 4. Culvert joint repair: Grout crown of pipe where voids exist after interior grouting is completed. The joints will be inspected and it will be determined if concrete collars are necessary. See NOE for full details.

Contact Information
Matt Kawashima
Contra Costa County
30 Muir Road
Martinez, CA 94553

Phone : (925) 313-2161


Contra Costa
Cross Streets
Pinehurst Road, approximately 2.5 miles northwest of Canyon Road at the first hairpin turn

Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
Reasons for Exemption
The Project consists of repair of existing public facilities involving no expansion of use. The project is exempt from CEQA pursuant to Section 15301 (c) of the CEQA guidelines.


Notice of Exemption
2020040255_NOE-Pinehurst Road Sinkhole and Culvert Repair   PDF 1195 K

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