Statewide Monitoring Network Modernization Project: St. Helena Station
Summary
SCH Number
2025070531
Public Agency
California Department of Water Resources
(DWR)
Document Title
Statewide Monitoring Network Modernization Project: St. Helena Station
Document Type
NOE - Notice of Exemption
Received
Posted
7/14/2025
Document Description
DWR proposes to upgrade the existing St. Helena hydrometeorlogical station by replacing the existing precipitation gauge, air temperature sensor, and relative humidity sensor and installing a new wind speed and direction sensor and soil sensor probes. Installation of the soil sensor probes would require soil testing and temporary excavation of a 3ft x 3ft x 3ft pit and a shallow conduit trench to connect the probes to the station. Data gathered would be used for agency decision-making and would be made publicly available through the California Data Exchange Center (CDEC) website.
Contact Information
Name
Brian Humphrey
Agency Name
California Dept. of Water Resources
Job Title
Sr. Environmental Scientist (Specialist)
Contact Types
Lead/Public Agency / Project Applicant
Phone
Location
Coordinates
Cities
St. Helena
Counties
Napa
Regions
Northern California
Cross Streets
Langtry Road
Zip
94574
Total Acres
0.18
Township
7N
Range
6E
Section
5
Notice of Exemption
Exempt Status
Categorical Exemption
Type, Section or Code
15301. Exist. Facilities; 15304. Minor Alt. to Land; 15306. Information Collection
Reasons for Exemption
Replacement of the station equipment, soil testing, and temporary excavation of a 3'x3'x3' soil pit and shallow trench that would be backfilled upon completion of soil sensor probe installation qualifies for categorical exemptions 15301 (existing
facilities), 15304 (minor alterations of land), and 15306 (information collection) because proposed activities would involve negligible expansion of existing use, would not have a significant effect on the environment, and would result in only
temporary, minor ground disturbance.
Attachments
Notice of Exemption
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