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4.7 Geology,Soils,and Seismicity V Alquist-Priolo Earthquake Fault Zoning Act The Alquist-Priolo Earthquake Fault Zoning Act(formerly the Alquist-Priolo Special Studies Zone Act), signed into law in December of 1972,requires the delineation of zones along active faults in California.This Act is discussed in this EIR for informational purposes, however, as discussed previously,the proposed project site is not located within an Alquist-Priolo fault zone and therefore,this Act is not applicable to the project. Seismic Hazards Mapping Act The Seismic Hazards Mapping Act was developed to protect the public from the effects of strong .. ground shaking,liquefaction, landslides,or other ground failure,and from other hazards caused by earthquakes. This act requires the State Geologist to delineate various seismic hazard zones ` and requires cities, counties,and other local permitting agencies to regulate certain development projects within these zones. Before a development permit is granted for a site within a seismic hazard zone,a geotechnical investigation of the site has to be conducted and appropriate mitigation measures incorporated into the project design. The California Geological Survey (CGS)has not at this time completed Seismic Hazard mapping within the USGS 7.5-minute topographic quadrangle containing the proposed project site. The CGS is currently zoning higher .� priority areas first and will eventually zone the Tracy-Vernalis area quadrangles. California Building Standards Code The California Building Code(CBC)is another name for the body of regulations known as the California Code of Regulations(CCR),Title 24, Part 2, which is a portion of the California Building Standards Code. Title 24 is assigned to the California Building Standards Commission (BSC), which,by law, is responsible for coordinating all building standards. Under state law, all building standards must be centralized in Title 24 or they are not enforceable(Bolt, 1988). Published by the International Conference of Building Officials(ICBG),the UBC is a widely adopted model building code in the United States. The California Building Standards Code I. incorporates by reference the UBC with necessary California amendments. About one-third of the text within the California Building Standards Code has been tailored for California earthquake conditions. 4.7.3 Impacts and Mitigation Measures Impact 4.7.1: The steepness of temporary excavation slopes proposed during active mining could reach3/4:1 Horizontal to Vertical (H:V) and therefore could be subject to instability ., under certain static conditions or during an earthquake. The proposed permanent 2:1(H:V) slopes could fail during moderate and strong earthquake ground shaking.Failure of the permanent 2:1(H:V)slopes during an earthquake could hamper future, post-mining reclamation efforts by increasing the potential for long term slope instability.These effects would be less than significant. ` At the proposed Vernalis quarry, removal and earthmoving of the sand and gravel deposits would result in excavations approaching 100 feet in depth. As proposed,the temporary excavation .. RMC Pacific Vernalis Quarry Mining and Reclamation Project 4.7-15 ESA 1203015 Draft Environmental Impact Report May 2006