DFD Seismic Refraction Surveys (OM-DFD-2025-067)
Summary
SCH Number
2025120062
Public Agency
California Department of Water Resources
(DWR)
Document Title
DFD Seismic Refraction Surveys (OM-DFD-2025-067)
Document Type
NOE - Notice of Exemption
Received
Posted
12/2/2025
Document Description
DWR will perform surface waves site surveys seismic stations in the Delta Field Division of the State Water Project. Equipment used during the surveys will include seismographs, accessories, and general hand tools. Staff will place the string of geophones along the ground that consist of a sensor in a 5-inch plastic housing attached to a 6-inch metal spike. Active arrays may use a ground impact source by either hitting a metal plate on the ground with a sledgehammer or using an accelerated weight attached to truck to impact the plate.
Contact Information
Name
Todd Percival
Agency Name
Department of Water Resources
Job Title
Senior Environmental Scientist
Contact Types
Lead/Public Agency / Parties Undertaking Project
Phone
Location
Coordinates
Cities
Antioch
Counties
Contra Costa, San Joaquin, Stanislaus
Regions
Northern California, San Francisco Bay Area
Other Location Info
Coordinates: Clifton Court Forebay: 37°49'39.04"N, 121°33'37.46"W, Antioch Water Treatment Plant: 37°59'22.98"N, 121°48'38.45"W, CAAQ Check 4: 37°37'41.29"N, 121°21'8.14"W, CAAQ Orestimba Siphon: 37°18'37.94"N, 121° 7'15.08"W, Circle K Ranch: 38°18'51.37"N, 121°29'29.09"W.
Notice of Exemption
Exempt Status
Categorical Exemption
Type, Section or Code
Class 6, Information Collection, Section No. 15306
Reasons for Exemption
The State Water Project provides significant and important services to many Californians. This project is exempt because it involves data collection activities for a safe water supply. This project will not result in impacts to special status species or habitat. Since this activity will be implemented without any environmental impacts, the Categorical Exemption Class 6 will be used for CEQA compliance.
County Clerks
Contra Costa, San Joaquin, Stanislaus
Attachments
Notice of Exemption
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