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DFD Seismic Refraction Surveys (OM-DFD-2025-067)

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State & Local

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The Department of Water Resources is conducting the DFD Seismic Refraction Surveys project, identified as OM-DFD-2025-067, within the Delta Field Division of the State Water Project. This initiative involves performing surface waves site surveys at seismic stations across Contra Costa, Stanislaus, and San Joaquin counties, with specific performance sites including the Clifton Court Forebay, Antioch Water Treatment Plant, CAAQ Check 4, CAAQ Orestimba Siphon, and Circle K Ranch. The technical scope requires the use of seismographs, general hand tools, and strings of geophones featuring sensors in plastic housings with metal spikes. To generate seismic data, staff will utilize ground impact sources such as sledgehammers hitting metal plates or truck-attached accelerated weights. The project is classified under NAICS code 541360 and is managed by the Division of Operations and Maintenance. A Notice of Exemption has been filed under CEQA Class 6 for information collection, confirming that the data collection activities will not impact special status species or habitats and are intended to support safe water supply services. Primary administrative oversight is provided by Senior Environmental Scientist Todd Percival and Environmental Program Manager Sara Lowry. The project was posted on December 2, 2025, with the primary place of performance centered in Antioch, California.

General Info

Water Resources seismic refraction surveys in California counties for the Delta Field Division.

Agency

California Water Resources, Department of

NAICS

541360 - Geophysical Surveying and Mapping ServicesView NAICS

Place of Performance

Antioch, CA

Set-Aside

NONE

Documents

(1)

NOE SFD Seismic Refraction Surveys OM-DFD-2025-067

PDF•notice-of-exemption

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Organization & Contact Information

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AgencyCalifornia Water Resources, Department of
Contacts1 person available
OfficeN/A
Organization / Agency
California Water Resources, Department of
Office AddressN/A
Contacts
Todd PercivalSenior Environmental Scientist
contact@example.gov
+1 (555) 000-0000

Full Description

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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.

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