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Lennar Homes of California Mountain House Creek, Parcel L, Tract 3424, Tracy 4943.410.103 Modified Phase I Environmental Site Assessment of the wetland area consists of the Central Community Park and the Mountain House Branch Library. 1.5 SITE AND VICINITY CHARACTERISTICS According to published topographic maps, the Property ranges in elevation from approximately 52 feet above mean sea level (msl) in the northeast to approximately 63 feet above msl to the southwest. Review of the Geologic Map of the Byron Hot Springs & Clifton Court Forebay quadrangles found that the Property is underlain by surficial sediments, including alluvial pebble gravel, sand, and clay of valley areas. Geocheck— Physical Setting Source Summary of the Environmental Data Resources, Inc. (EDR) report (Appendix A) indicated three Federal United States Geological Survey (USGS) and 11 State wells located within 1 mile of the Property. Well Numbers USGS40000185573, USGS40000185543, and USGS40000185622 are mapped approximately 1/8 to 1 mile southeast, southeast, and east-northeast, respectively, of the Property. One groundwater level measurement was reported for each of these wells. Groundwater in the vicinity of Property was observed between 4 feet and 6 feet below the ground surface (bgs). The Physical Setting Source Summary also provided hydrogeologic information for use as an indicator of groundwater flow direction in the immediate area. However, no groundwater flow direction information was identified. We reviewed the Department of Water Resources On-line Water Data Library for depth to water in the vicinity of the Property. The website identified one well within 1 mile of the Property. We reviewed EnviroStor, a website maintained by the State of California Department of Toxic Substances Control (DTSC), and GeoTracker, a website maintained by the State of California Water Resources Control Board (SWRCB), for nearby facilities with records that include depth to groundwater measurements. The following information was obtained regarding local groundwater conditions. TABLE 1.5-1: Local Groundwater Conditions PROXIMITY • REPORTED DEPTH PROPERTY TO GROUNDWATER GROUNDWATER FLOW DIRECTION 0.6 mi SE 5-16 feet bgs N/A 0.3 mi E-NE 14.5-22 feet bgs North 0.7 mi E-SE 9-16 feet bgs Northeast The site-specific depth to groundwater and direction of groundwater flow was not determined as part of this assessment. Fluctuations in groundwater levels may occur seasonally and over a period of years due to variations in precipitation, temperature, irrigation and other factors. We reviewed the Department of Conservation, Geologic Energy Management(CalGEM),formerly the Department of Conservation, Division of Oil, Gas, and Geothermal Resources (DOGGR), website and map database to determine if any historic oil and/or gas wells were located within the Property. Two plugged dry hole wells were mapped within 1 mile of the Property. ENGEO March 15, 2021 Expect Excellence