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6.6 Geology and Soils 6.6 GEOLOGY AND SOILS 6.6.1 OVERVIEW AND SUMMARY This section analyzes potential geotechnical (e.g., soils engineering and seismic) and engineering geologic (e.g., fault and landslide) impacts resulting from project implementation. The site is currently occupied by the St. John's Seminary College, and citrus and avocado orchards. Geotechnical and engineering geologic investigations have focused on engineering properties, geologic hazards, fault rupture and slope stability. Existing studies indicate that the development is feasible and impacts would be less than significant provided all current codes, and geotechnical report and City recommendations are followed. 6.6.2 LITERATURE AND DATA REVIEW Reports and maps describing the geologic and soil conditions at the proposed project site include both site-specific project related studies by Geolabs-Westlake Village (Geolabs), studies by Geolabs on adjacent properties to the east, and other generally available public data sources. Other sources include published documents from federal, state, and local agencies (US Geological Survey [USGS]; California Geological Survey [CGS, formerly the California Division of Mines and Geology (CDMG)], the City of Camarillo, and Ventura County), and the Dibblee Foundation, as listed in Section 11.0, References. Project-related Studies The following project related reports were utilized and are also provided in Appendix 6.6: • Geolabs-Westlake Village, June 12, 2006, “Limited Fault Location and Activity Assessment,” which describes the results of geologic exploration trenching (three fault trenches) to assess the potential for fault rupture within the development areas. • Geolabs-Westlake Village, September 27, 2006, “Preliminary Geotechnical Considerations for Site Development” which includes the results from geotechnical and engineering geologic investigations focused primarily on geologic mapping, aerial photo review, slope stability considerations along the northern development area boundary, more on fault rupture potential, and site seismic hazard potential. • Geolabs-Westlake Village, October 9, 2008, “Response to Review, St. John’s Seminary, City of Camarillo, California,” which responds to seven review comments by Fugro West, October 5, 2007 and describes the results of additional geologic exploration including fault trenching, drilling, Impact Sciences, Inc. 6.6-1 St. John’s Seminary Residential Community EIR 0037.030 June 2017 6.6 Geology and Soils laboratory testing, and analysis to assess the potential for fault rupture, mitigation of fault movement, landslide occurrence, slope stability, and other issues. • Geolabs-Westlake Village, January 31, 2012, “Zones of Deformation Tract Nos. 5191, 5247, and 5248 East of St. John's Seminary, City of Camarillo, California,” which discusses zones of deformation in projects to the east and the relationship to the project area. • Geolabs-Westlake Village, February 2, 2012, “Supplemental Discussion of the Weber fault Preliminary Geotechnical Considerations for Site Development, St. John's Seminary, City of Camarillo, California,” which describes the results of previous geologic fault exploration and provides opinions regarding the presence of potential faults capable of ground rupture within the development areas. There are numerous references to, and examples from, fault trench logs in Tract Nos. 5191, 5247, and 5248. • Geolabs-Westlake Village, August 31, 2016, "Geotechnical Investigation, Proposed Subdivision of a portion of St. John's Seminary, Tentative Tract 5976, 5012 Seminary Road, City of Camarillo, California," which addresses the tentative grading plans by Encompass Consultant Group, and to assess the geotechnical feasibility of the project. • Engineering Geology and Geotechnical Engineering Review, completed December 13, 2017 by FUGRO, Tract 5976 / RPD-198 • Geolabs-Westlake Village, May 1, 2017, “Update Geotechnical Investigation and Response to Engineering Geology and Soils Engineering Review, Proposed Subdivision of a Portion of St. John's Seminary, Tentative Tract 5976, 5012 Seminary Road, City of Camarillo, California.” Geotechnical engineering properties were described in the 2006 and 2008 reports for the northern roughly one-sixth of the proposed development area where 10 borings were drilled, logged, and sampled, and for which laboratory tests were performed. It is understood that these reports were not based on specific project design alternatives, and the reports present technical conclusions and general design recommendations (e.g., fault and slope setbacks, possibly special foundations in fault deformation areas). Substantial future fieldwork, testing, and analysis is implied, suggested, and recommended. The 2012 reports were prepared to amplify on and clarify two technical areas: (1) fault rupture potential on the so-called “Weber fault” that is mapped along the east-west canyon through the project site, and (2) zones of deformation identified in adjacent tracts to the east; Geolab’s reviewed applicable trench logs and reports to provide their opinion on these matters. Impact Sciences, Inc. 6.6-2 St. John’s Seminary Residential Community EIR 0037.030 June 2017 6.6 Geology and Soils The most recent 2016 assessments and subsequent report were to assess the geotechnical feasibility of the proposed project and not to provide final design criteria. Work for the study included excavating three additional bucket auger borings in the southeast portion of the site, collecting samples from these borings, and testing the samples. This report was reviewed by the City on December 13, 2016 for consistency with the City of Camarillo Guidelines for the Preparation of Geotechnical and Geological Studies. Other Data Sources Public readily available data sources include California Division of Mines and Geology (CDMG—now the California Geological Survey [CGS]) geologic mapping of active fault zones and seismic hazards, CGS probabilistic earthquake hazards assessment, USGS and Dibblee Foundation geologic mapping, the Ventura County General Plan, and the City of Camarillo General Plan Safety Element and Geotechnical Guidelines hazard zones. 6.6.3 METHODOLOGY Project-specific technical reports and other technical data sources (maps and reports noted above in footnotes) were reviewed to establish the existing geology and soils conditions affecting the proposed project site. Consideration was given to the potential impacts due to the implementation of the proposed project considering the local and regional geology and soils setting. 6.6.4 APPLICABLE REGULATIONS Federal Regulations No specific federal regulations were identified that impact the geology and soils considerations. State and local regulations (e.g., building codes) reflect national and international building codes; this is discussed below. State Regulations Alquist-Priolo Earthquake Fault Zoning Act The 1972 Alquist-Priolo Special Studies Zones Act 1971 resulted from the consequences of the Sylmar-San Fernando earthquake and seeks to mitigate the hazard of fault rupture by prohibiting the location of structures for human occupancy across the trace of an active fault. The Act was renamed in 1994 to the Alquist-Priolo Earthquake Fault Zoning (APEFZ) Act. The Sylmar-San Fernando earthquake produced Impact Sciences, Inc. 6.6-3 St. John’s Seminary Residential Community EIR 0037.030 June 2017 6.6 Geology and Soils surface fault rupture damage along a zone that might have been identified in advance of the earthquake had the proper studies been mandated. The best and most feasible surface rupture mitigation is avoidance of the causative fault. Thus, the APEFZ Act mandates that cities and counties (lead agencies) require that within an Earthquake Fault Zone (EFZ) geologic investigations must be performed to demonstrate that potential development sites are not threatened by surface fault displacements from future earthquakes. To aid the various jurisdictions that function as lead agencies for project approvals in California, the California Geological Survey must delineate Earthquake Fault Zones on standard US Geological Survey topographic maps (1-inch-equals-2000-feet scale) along faults that are "sufficiently active and well defined" as defined in the Act. Quoting from the implementation guide, Special Publication 421: Zone boundaries on early maps were positioned about 660 feet (200 meters) away from the fault traces to accommodate imprecise locations of the faults and possible existence of active branches. The policy since 1977 is to position the EFZ boundary about 500 feet (150 meters) away from major active faults and about 200 to 300 feet (60 to 90 meters) away from well-defined, minor faults. Exceptions to this policy exist where faults are locally complex or where faults are not vertical. Lead agencies have the responsibility to regulate most development projects within the Earthquake Fault Zones as described in the APEFZ Act, but may enact more stringent regulations. Certain smaller residential developments can be exempt. Camarillo currently has several APEFZs, with the Simi-Santa Rosa fault creating an east-west trending zone across the far eastern portion of the proposed site. There are ten fault lines identified in the Camarillo General Plan Safety Element. These faults are considered the most significant active fault zones that are capable of seismic ground shaking and can impact the City. These include: the Simi-Santa Rosa Fault, Anacapa-Dume Fault, Bailey Fault, Wright Road Fault, Sycamore Canyon and Boney Mountain Faults, Oak
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