COOT Calpella Bridge 2 Replacement, Geotechnical Drilling Project


SCH Number
Public Agency
Regional Water Quality Control Board, Region 1 (North Coast), Santa Rosa
Document Title
COOT Calpella Bridge 2 Replacement, Geotechnical Drilling Project
Document Type
NOE - Notice of Exemption
Document Description
Cal trans is proposing a geotechnical investigative drilling operation in and adjacent to the Russian River at State Route 20 in order to obtain subsurface information that would inform design for replacement of the Calpella Bridge. Drilling would be conducted at eight (8) locations in the vicinity of the future bridge abutments. The proposed soil and rock borings would be between 4 to 6- inches in diameter and would be drilled to approximate depths of 50 to 150-feet. A 5.5-inch diameter steel casing may be used at the top of the boring hole to secure drilling fluid circulation. The drilling fluids shall be contained and recirculated through a closed system-drilling fluids and products shall be fully recovered in a mud tank before being transferred to 55- gallon steel drums for disposal. The boreholes would be backfilled with cement grout and/or bentonite.

Contact Information

Susan Stewart
Agency Name
North Coast Regional Water Quality Control Board
Contact Types
Lead/Public Agency

Agency Name
California Department of Transportation
Contact Types
Project Applicant


Redwood Valley
Other Location Info
State Route 20, Post mile 33.4 - 34.2

Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
Reasons for Exemption
The project involves basic data collection with minor alterations to land and vegetation which do not result in a serious or major disturbance to an environmental resource.


Notice of Exemption

Disclaimer: The Governor’s Office of Planning and Research (OPR) accepts no responsibility for the content or accessibility of these documents. To obtain an attachment in a different format, please contact the lead agency at the contact information listed above. You may also contact the OPR via email at or via phone at (916) 445-0613. For more information, please visit OPR’s Accessibility Site.

Download CSV New Search Print