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City of Pleasanton—Hidden Canyon Residences and Preserve <br />Draft EIR Executive Summary <br /> <br /> <br />FirstCarbon Solutions ES-36 <br />https://adecinnovations.sharepoint.com/sites/PublicationsSite/Shared Documents/Publications/Client (PN-JN)/2148/21480016/EIR/3 - Draft EIR/21480016 Sec00-03 Exec Summary.docx <br />Impacts <br />Level of Significance Before <br />Mitigation Mitigation Measures Level of Significance After Mitigation <br />Cumulative Impact Less than significant impact. None. Less than significant impact. <br />Section 3.6—Geology, Soils, and Seismicity <br />GEO-1: The proposed project would not directly or <br />indirectly cause potential substantial adverse <br />effects, including the risk of loss, injury or death <br />involving: <br />i) Rupture of a known earthquake fault, as <br />delineated on the most recent Alquist-Priolo <br />Earthquake Fault Zoning Map issued by the <br />State Geologist for the area or based on other <br />substantial evidence of a known fault? Refer to <br />Division of Mines and Geology Special <br />Publication 42. <br />ii) Strong seismic ground shaking. <br />iii) Seismic-related ground failure, including <br />liquefaction. <br />iv) Landslides. <br />Potentially significant impact. MM GEO-1: Design-level Geotechnical <br />Study <br />Prior to the issuance of any building or <br />grading permits, a design-level geotechnical <br />investigation on the project site and review <br />of detailed site plans shall be performed by a <br />qualified Geotechnical Engineer. The design- <br />level geotechnical investigation could <br />incorporate a variety of field methods and <br />would include (but not be limited to) the <br />following items: <br />• Evaluating the lateral extent and depth of <br />colluvial soils. <br />• Performing a seismic refraction survey to <br />determine shear wave velocities at deeper <br />depths. <br />• Analyzing and developing slope grading <br />and engineered buttress fill design <br />criteria. <br />• Evaluating upslope sources of water. <br />• Evaluating the Site Classification for <br />Seismic Design. <br />• Estimating appropriate minimum building <br />setbacks from the face of fill slopes. <br /> <br />The qualified Geotechnical Engineer would <br />be required to demonstrate that <br />implementation of the recommendations <br />would reduce potential impacts associated <br />with liquefaction and landslide potential to <br />below a level of significance in conformance <br />with the standards in the California Building <br />Less than significant impact with <br />mitigation incorporated.