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Shea Homes- Northern California Bergamo at Mountain House 4943.009.002 Phase I Environmental Site Assessment 1.0 INTRODUCTION SITE LOCATION AND DESCRIPTION ENGEO conducted a phase I environmental site assessment for the Property located at De Anza Boulevard and Central Parkway in Mountain House, California (Figures 1 and 2). The approximately 11.41-acre Property is identified as APN 256-510-01 (Figure 3). CURRENT USE JF PROPERTY AND ADJOINING PROPERTIES Currently the Property consists of a relatively level, sheet-graded lot. No permanent structures were observed on the Property. Utilities, paved roads, and sidewalks were noted around the Property. Adjacent properties consist of finished residential homes to the west, undeveloped graded lots to the east and south, and Byron Highway to the north. SITE AND VICINITY CHARACTERISTICS According to published topographic maps, the Property ranges in elevation from approximately 50 feet above mean sea level (msl) in the south to approximately 45 feet above msl to the north. Review of the Dibblee Geologic Map (2006)found that the Property is underlain by Alluvial Pebble Gravel (Qa), which are described as Quaternary-aged surficial sediments comprised of 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 three State wells located within 1 mile of the Property. Groundwater in the vicinity of Property was observed between 4 feet and 6 feet below the ground surface. 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 three wells within 1 mile of the Property. The well to the southeast in an adjacent parcel had a historical groundwater elevation range of 5 to 15.7 feet below the existing ground surface. 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. Three wells were mapped within 1 mile of the Property. The wells are to the east and northeast, and each are identified as "plugged, dry hole". PURPOSE OF PHASE I ENVIRONMENTAL SITE ASSESSMENT This assessment was performed at the request of Shea Homes for the purpose of environmental due diligence during property acquisition. The objective of this phase I environmental site assessment is to identify Recognized Environmental Conditions (RECs) associated with the Property. As defined in the ASTM Standard Practice E1527-13, an REC is "the presence or likely presence of any hazardous substances or petroleum products in, on, or at a property: (1) due to &Nr—`*EO April 20, 2020 Expect Excellence-