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A. The boundary lines of the special study areas shown on the geologic hazards' maps shall be determined by use of the scale appearing on the map. Maps intend to represent generalized scientific information designed to indicate areas where hazards may exist and where geologic hazards studies are required. Because the geologic hazards study area maps are prepared at a non-site specific scale, hazards may exist that are not shown on the geologic hazards study area maps. A site that is not shown in a geologic hazards study area for a particular hazard does not exempt the applicant from considering the hazard if evidence is found that it may exist. If it is subsequently determined that the site features a geologic hazard not represented on the geologic hazards study area maps, the review process will be pursuant to this chapter.
B. Geologic hazards study area maps may be updated and amended by the city as per Chapter 13.07 if found to be inaccurate or in error, or as new methods or data are developed to better define areas of potential hazards.
C. Where geologic hazards study area maps are thought by an applicant to be inaccurate or in error and require revision, the applicant shall submit to the city technical evidence by a qualified professional supporting the claim and showing the proposed revision. The city will review the information and render a decision. The applicant may appeal that decision to the city council. (Ord. 2021-26, 10-14-2021)
Geologic hazard studies often involve both engineering geology and geotechnical engineering. Engineering geologic studies shall be performed under the direct supervision of a qualified professional engineering geologist. Geotechnical engineering studies shall be performed under the direct supervision of a qualified professional geotechnical engineer. (Ord. 2021-26, 10-14-2021)
This section shall apply to any geologic hazard investigation for the purpose of determining the feasibility of development or for the purpose of exploring, evaluating or establishing locations for permanent improvements.
A. Scoping Meeting: The developer or consultant shall schedule a scoping meeting with the city's technical review committee (TRC) to evaluate the engineering geologist/geotechnical engineer's investigative approach. At this meeting, the consultant shall present a work plan that includes locations of anticipated geologic hazards and locations of proposed exploratory activities necessary to minimum standard of practice. The investigation approach should allow for flexibility due to unexpected site conditions. Field findings may require modifications to the work plan. Upon completion of a successful scoping meeting, a grading permit application may be submitted to the City.
B. Grading Permit: As required by title 13 of this code and except as otherwise noted therein, no person shall commence or perform any grubbing, grading, earthwork, or any other land disturbance activity, without first obtaining a permit. Application shall be filed with the community and economic development department on forms provided and maintained by the city for such purpose. (Ord. 2021-26, 10-14-2021)
Any applicant requesting development on a parcel of land within a geologic hazards study area, as shown on the Appendix A: Geologic Hazards Maps, and as indicated in Chart 13.75.071 of this section, shall submit to the community and economic development department two (2) copies and one digital copy of site specific geologic hazard studies and reports. (Ord. 2021-26, 10-14-2021)
Land Use (Type Of Facility) | Liquefaction Potential | Surface Fault Repture Special Study Area | |
High And Moderate | Low And Very Low | ||
Land Use (Type Of Facility) | Liquefaction Potential | Surface Fault Repture Special Study Area | |
High And Moderate | Low And Very Low | ||
Critical facilities (essential and hazardous facilities, and special occupancy structures, as defined in section 13.75.020
of this chapter) | Yes | Yes | Yes |
Industrial and commercial buildings (greater than 2 stories or 5,000 square feet) | Yes | No | Yes |
Multi-family residential structures (4 or more units per acre), and all other industrial and commercial | Yes | No | Yes |
Residential subdivisions | Yes | No | Yes |
Residential single lots and multi- family dwellings (less than 4 units per acre) | No* | No | Yes |
*Although no special study is required, disclosure is required as described in section 13.75.100
of this chapter. | |||
(Ord. 2021-15, 9-20-2012; amd. Ord. 2021-26, 10-14-2021)
A. Preparation: The geologic hazards report shall be prepared by an engineering geologist. In the case of a snow avalanche hazard, the report shall be prepared by an experienced avalanche expert. The report shall be signed by the preparer and shall also include the qualifications of the preparer.
B. Content: The report shall be site specific and identify all known or suspected potential geologic hazards, originating on site or off site, affecting the particular property. The report shall reflect current professional practice similar or to exceed the guidelines suggested in Utah Geologic Survey Circular 122 (2016) or it beyond the minimum reporting standards may be required to adequately address the fault hazard. Minimum replacement document. Considering the complexity of evaluating surface and near-surface faults, additional effort reporting standards required or inferred, does not relieve the engineering geologist from his/her duty to perform additional geologic or engineering services he/she believes are necessary to assess the fault rupture potential at a site.
C. Site Map: The report shall include a detailed site map (scale: 1-inch equals 200 feet or larger), showing the location of the hazards with delineation of the recommended setback distances from hazards and the recommended location for structures.
D. Effects Addressed: The report shall address the potential effects of the hazards on the proposed development and occupants thereof in terms of risk and potential damage.
E. Recommendations: The report shall contain recommendations for avoidance or mitigation of the effects ofthe hazards, consistent with the purposes set forth in section 13.75.010 of this chapter. The evidence on which recommendations and conclusions are based shall be clearly stated in the report. Trench logs (scale: 1-inch equals 5 feet, or larger), aerial photographs, references with citations, and other supporting information as applicable, shall also, be included in the report. (Ord. 2012-15, 9-20-2012; amd. Ord. 2021-26, 10-14-2021)
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