Last Chance Geophysical Investigation
Summary
SCH Number
2006088316
Public Agency
California Department of Transportation, District 1
Document Title
Last Chance Geophysical Investigation
Document Type
NOE - Notice of Exemption
Received
Posted
8/30/2006
Document Description
Caltrans is preparing to complete a geophysical investigation of the area in the vicinity of Route 101 in Del Norte County from post mile 14.8 to 15.6. This segment of the 101 known as "Last Chance Grade," is perched on the edge of a failing coastal bluff near the Pacific Ocean. The elevation of the hillside ranges from sea level to approximately 350 meters (1150 feet) at the ridge top. The roadway is at roughly elevation 250 meters (820 feet). Active slides have historically required an extremely high level of Caltrans maintenance effort to avoid road closures, and in the 1970's slide activity at this location claimed two lives. Caltrans is proposing a project that would straighten curves and stabilize roadway embankments by constructing six retaining walls. The purpose of the borings and seismic lines is to generate subsurface geo-technical data essential for the design of the proposed retaining walls. Boring sites and seismic refraction lines have been selected at each wall location for the proposed geophysical investigation work. All locations are within existing right-of-way.
Contact Information
Name
Scott Williams
Agency Name
Department of Transportation, District 1
Contact Types
Lead/Public Agency
Phone
Location
Counties
Del Norte
Notice of Exemption
Exempt Status
Categorical Exemption
Type, Section or Code
Section 15306
Reasons for Exemption
The project proposes a geophysical investigation of the "Last Chance Grade" in Del Norte County. All activity is the within state right-of-way and the project will avoid trees, wetlands, sensitive species, and cultural resources. An initial site assessment indicates the project will be free of hazardous waste issues.
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 state.clearinghouse@opr.ca.gov or via phone at (916) 445-0613.