COOT Calpella Bridge 2 Replacement, Geotechnical Drilling Project
Summary
SCH Number
2019080140
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
Received
Posted
8/7/2019
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
Name
Susan Stewart
Agency Name
North Coast Regional Water Quality Control Board
Contact Types
Lead/Public Agency
Phone
Name
Agency Name
California Department of Transportation
Contact Types
Project Applicant
Location
Cities
Redwood Valley
Counties
Mendocino
Other Location Info
State Route 20, Post mile 33.4 - 34.2
Notice of Exemption
Exempt Status
Categorical Exemption
Type, Section or Code
15306
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.
Attachments
Notice of Exemption
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