1601 N Bristol St - Phase 1 - Plan

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CITY OF SANTA ANA Planning and Building Agency Mr. Amir Houriani Project No. 32-6235-00 1601-1607N. Bristol Street August 29, 2022 SUBSURFACE CONDITIONS Soil Profile PageApproved FOR PERMIT ISSUANCE Master ID: Date: The in -situ materials encountered during field exploration consisted of native alluvial soils. The alluvium comprises firm to very stiff lean clays with varying amounts of sands and loose to dense clayey sands. The moisture condition of the soils ranged from slightly moist to wet. No artificial fill was encountered in the borings. More detailed descriptions of the soils encountered may be obtained from the individual log of the exploratory borings enclosed in this report. Groundwater Perched water was encountered in exploratory Boring B-1 at a depth of about 50 feet below existing grade. According to the Seismic Hazard Zone Report of the Anaheim 7.5-Minute Quadrangle (CDMG, 1997), the historically highest groundwater level is approximately 40 feet below the ground surface. Groundwater conditions below any given site fluctuate due to various factors including seasonal precipitation, local irrigation, stormwater recharge, and pumping. SEISMIC HAZARDS The subject site is situated in a seismically active region. The primary seismic hazard is moderate to strong ground shaking caused by an earthquake on local or regional faults. The potential for other seismic -induced hazards have been evaluated and are discussed below. Surface Rupture The Alquist-Priolo Earthquake Fault Zoning Act requires the California Geological Survey (CGS) to zone "active faults" within the State of California. "Active" faults, as defined by CGS, have exhibited surface displacement within the last 11,000 years. It is this recent fault movement that the CGS considers a characteristic for faults that have a relatively high potential for ground rupture in the future. CGS policy is to delineate a boundary from 200 to 500 feet wide on each side of the known fault trace based on the location precision, the complexity, or the regional significance of the fault. If a site lies within an Earthquake Fault Zone, a geologic fault rupture investigation must be performed that demonstrates that the proposed building site is not threatened by surface displacement from the fault before development permits may be issued. Review of the Earthquake Zones of Required Investigation for the Anaheim Quadrangle indicates that the subject site is not located within an Alquist-Priolo Earthquake Fault Zone. Based on this data, the potential for surface rupture resulting from the movement of nearby faults is low. n �u A.G.I. Geotechnical, Inc. • 16555 Sherman Way, Suite A • Van Nuys, CA 91406 L ;� Office: (818)785-5244 • Facsimile: (818)785-6251