United States Geological Survey (USGS) - Los Angeles Regional Seismic Experiment, Phase II
Summary
SCH Number
1999098228
Public Agency
California Santa Monica Mountains Conservancy
(SMMC)
Document Title
United States Geological Survey (USGS) - Los Angeles Regional Seismic Experiment, Phase II
Document Type
NOE - Notice of Exemption
Received
Posted
9/20/1999
Document Description
The project consists of seismic research within the Santa Monica and the Santa Susana Mountains. This project is part of a much larger study within the greater Los Angeles region. The research will include the placement of seismographs, drilling of boreholes, detonations, and ground shaking. Seismographs will be placed at approximate 100-meter intervals along or near both routes and each will be buried in a 1 foot hole. There will be two boreholes locations where small explosives will be placed. One will be located just southeast off of East Canyon Mtway in Santa Clarita Woodlands Park and the other, east of Reseda Blvd., accross from the Braemar County Club entrance within the Mulholland Gateway Park. Boreholes will be 8 inches in diameters, extend 60 to 100 feet below the ground surface, and be lined with iron or PVC casing. A drilling rig mounted on a 3-axle truck will drill the boreholes. Boreholes are not primed for detonation until just a few minutes before detonation. All work will be preformed by and supervised by USGS staff. No potential for significant impacts to the environment are anticipated.
Contact Information
Name
Jeff Bolton
Agency Name
Santa Monica Mountains Conservancy
Contact Types
Lead/Public Agency
Phone
Location
Cities
Los Angeles, Los Angeles, City of
Counties
Los Angeles
Notice of Exemption
Exempt Status
Categorical Exemption
Type, Section or Code
Section 15601 (b)(3)
Reasons for Exemption
This is a major study conducted by the USGS and the Southern California Earthquake Center and is part of the National Earthquake Hazards Reduction Program. The goals of the study will help educate earthquake professionals by collecting and surveying seismic imagery in the Los Angeles region. The goals of this project will help in understanding the processes by which earthquakes are generated, collect data needed to protect to predict strong ground shaking during future large earthquakes, better locate earthquakes, and better communicate earthquake hazard information to the public. This project will not trigger earthquakes and all necessary precautions regarding site specific environmental impacts have been assessed and no significant impacts are anticipated. Boreholes are located in already disturbed sites and along or near existing roads. Any immediate disturbance will be fully restored to pre-existing site conditions.
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.