HUM 254 Culvert Rehab Geotechnical Drilling


SCH Number
Public Agency
California Department of Transportation, District 1 (DOT)
Document Title
HUM 254 Culvert Rehab Geotechnical Drilling
Document Type
NOE - Notice of Exemption
Document Description
Caltrans proposes to drill ten geotechnical borings into the pavement or gravel shoulder of State Route 254. The estimated maximum depth for the 4.75-inch diameter, vertical borings would be approximately 75 feet below ground surface but would vary according to the site conditions. Stand-pipe piezometers (groundwater monitoring wells) will be installed in three of the borings, one at each of the trenchless culvert installation sites. These instruments will be periodically monitored over a period of up to 12 months before being destroyed in accordance with Humboldt County Environmental Health agency requirements. The purpose of geotechnical drilling is to characterize the subsurface conditions. Geotechnical drilling is needed to support the design and construction of the proposed HUM 254 Culvert Rehab project bridges and trenchless installation culverts. All geotechnical drilling will be within the Caltrans right of way.

Contact Information

Cassie L Nichols
Agency Name
Job Title
Environmental Scientist
Contact Types
Lead/Public Agency


State Highways
State Route 254
Other Location Info
10 locations on State Route 254
Other Information
Approximate Coordinates 2 locations near Postmile 22.38 40.375797°/ - 123.924814° 40.375753°/ - 123.924721° 2 locations near Postmile 40.81/40.8. 40.411976°/- 123.958567° 40.412020°/- 123.958714° 2 locations near Postmile 15.04 40.295070°/ - 123.896351° 40.295071°/ - 123.896440° Postmile 11.96 2 locations near postmile 11.96 40.270317°/- 123.865829° 40.270243°/- 123.865760° 2 locations near Postmile 11.93 40.275596°/- 123.863935° 40.275546°/- 123.864023°

Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
Reasons for Exemption
This project is exempt because it will not have significant impacts to the environment or to cultural or historic properties.
County Clerk


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