Seismic Monitoring Station Upgrade


SCH Number
Public Agency
California Governor's Office of Emergency Services (OES)
Document Title
Seismic Monitoring Station Upgrade
Document Type
NOE - Notice of Exemption
Document Description
By upgrading from antiquated analog recording systems to state-of-the-art earthquake recording and telemetry equipment, this station will be able to contribute continuous seismic data to the CA Earthquake Early Warning System and ShakeAlert, designed to potentially save thousands of lives during a large earthquake, prevent critical infrastructure damage, and expedite recovery following a large earthquake. With permission from the property owner secured, USGS plans to upgrade and operate the seismic monitoring station at the Lat/lon location noted above. The existing equipment enclosures will be removed and replaced with two new aluminum enclosures (2' x 3' x 21"H) mounted to 6" thick concrete pads: one concrete pad at grade and the second concrete pad at a depth of typically 16" below grade. The existing antenna and PV mast at the site will be replaced with an 8' tall steel pipe which will be mounted to one enclosure and concrete pad and hold the 2'x4' solar array and telemetry antenna. The two enclosures will be connected by flexible conduit in a shallow trench; this trench will be filled to grade after installation. A ground rod will be driven to a depth of 8' proximate to the radio/battery enclosure; additionally, a 2-gauge wire will be buried in a 12" deep, 6" wide trench around the exterior of the enclosure. All excavation will be dug by hand or mini-excavator, depending on site accessibility. There are no hazardous substances involved during construction nor as components on the site.

Contact Information

Ryan Arba
Agency Name
Office of Emergency Services, California
Contact Types
Lead/Public Agency


Cross Streets
Fort Ross Rd., Cazadero, CA;
Other Information
Dot Map ID: UG0003; Station Name/Site Code: Fort Ross 32/NC.NFR

Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
15303, 15304, 15306
Reasons for Exemption
This project is exempt in accordance with Class 3 (New Construction), Class 4 (Minor alterations to land), Class 6 (Information Collection)

Disclaimer: The document was originally posted before CEQAnet had the capability to host attachments for the public. To obtain the original attachments for this document, 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.

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