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3.0 PHYSICAL SETTING <br />3.1 Topography <br />The Site is depicted on the United States Geological Survey (USGS) topographic map for the Tustin <br />7.5-minute quadrangle. The Site is shown on the map as being situated at an elevation of approximately <br />150 feet above mean sea level. The Site and surrounding area appear relatively level with a slight <br />gradient downward to the south. There are no improvements , structures or surface waters depicted on - <br />Site on the map. Adjoining and surrounding roadways are depicted on the map. The Site as depicted <br />on a topographic map is included as Figure 3. <br />3.2 Hydrology <br />The Site is situated within the Lower Santa Ana River Basin. There are no known substantial <br />hydrologic features at the Site including major storm drain inlets or obvious drainages, channels, or <br />surface waters. The Site is currently undergoing demolition activities. Due to the substantial amount <br />of improvements at the Site, infiltration of precipitation to the Site is considered to be relatively minor. <br />Excess water appears to flow as surface runoff to various storm drain inlets at the Site. On -Site storm <br />drains appear to discharge to the municipal stormwater conveyance system. The Site does not appear <br />to receive significant drainage from off -Site properties. <br />3.3 Geology <br />General geologic information pertaining to the Site is presented in the table below. <br />Geologic Consideration <br />Details <br />California Geomorphic <br />Peninsular Ranges. <br />Province <br />Mapped Soils or Formation <br />The Site is located in the Coastal Plain of Orange County which is underlain by a <br />coastal alluvial plain. <br />Description of Soils or <br />According to lithological descriptions provided during prior subsurface <br />Formation <br />investigative work, the Site is underlain by silty sand, sandy silt, and clayey silt <br />with sand. <br />Distance/Direction to <br />The closest reported mapped active fault is the Newport -Inglewood -Rose Canyon <br />Mapped Faults <br />Fault located approximately five miles to the southwest. <br />3.4 Hydrogeology <br />General hydrogeologic information pertaining to the Site is presented in the table below. <br />Hydrogeologic <br />Details <br />Consideration <br />Groundwater Basin or Unit <br />Santa Ana Groundwater Basin. Irvine Groundwater Management Zone. <br />Beneficial Uses <br />Municipal and domestic supply, agricultural supply, industrial service supply, and <br />industrial process supply. <br />Estimated Depth to <br />Estimated at greater than 20 feet bgs. <br />Groundwater <br />Phase I Environmental Site Assessment January 16, 2022 <br />Cabrillo Town Center, Santa Ana, CA <br />Council 18 —1112 10/3/2023 <br />