Humboldt County is a relatively hazardous area in terms
of ground shaking and fault rupture, landsliding, and soil erosion.
For instance, the County is in the two highest seismic risk zones of the
Uniform Building Code; and offshore Cape Mendocino, there exists the highest
concentration of earthquake events anywhere in the continental United States
WHEN ARE GEOLOGIC REPORTS NECESSARY?
The Humboldt County General Plan sets forth policies
which specify when Geologic Reports are required (see Section 3100 et seq.).
Planning staff can determine the Geologic Report requirements of your project
by locating your property on the General Plan Hazard Rating Maps, and then
review the Hazard Rating Matrix. The matrix will determine the type
of Geologic Report (if any) your project will need prior to project approval
(an R-1 or R-2 Re port).
WHO PREPARES A GEOLOGIC REPORT?
An R-1 Report must be prepared by a certified engineering
geologist, and an R-2 Report may be prepared by a soils engineer; however,
if the soils engineer determines that a geologic reconnaissance needs to
be done, a registered geologist will be required to consult on the Re port.
|CONTENTS OF A GEOLOGIC REPORT
R-1 and R-2 Reports both include a geologic and a soils
report (the preliminary geologic report may be waived for R-2 Reports
if the engineer certifies that a geologic reconnaissance is not nessary).
The geologic report includes a description of the geology
of the area and recommendations for the building site. Recommendations
included in the report should be incorporated in the grading and construction
plans for the project.
The soils report includes a description of the nature,
distribution and strength of the existing soils, and recommendations for
building on the site. The soils report also describes the location
and logs of any test borings and percolation test results if on-site sewage
disposal is proposed.
WHO REVIEWS AND APPROVES GEOLOGIC REPORTS?
Geologic Reports are reviewed by Planning and Building
Division staff and representatives of the Public Works Department.
The final approval is made by the Chief Building Official.
PLEASE NOTE: This process normally takes approximately
7-10 working days from the date the report was submitted.