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Shea Homes- Northern California Bergamo at Mountain House 4943.009.002 Phase I Environmental Site Assessment 2.3 HISTORICAL RECORD SOURCES The purpose of the historical record review is to develop a history of the previous uses or occupancies of the Property and surrounding area in order to identify those uses or occupancies that are likely to have led to recognized environmental conditions on the Property. 2.3.1 Historical Topographic Maps Historical USGS topographic maps were reviewed to determine if discernible changes in topography or improvements pertaining to the Property had been recorded. The following maps were provided to us through an EDR Historical Topographic Map Report, presented in Appendix C. TABLE 2.3.1-1: Historical Topographic Maps QUAD YEAR DESCRIPTION Property: The Property is vacant. Elevation is approximately 52 feet above msl in the south and approximately 45 feet msl in the north. Adjoining: Scattered structures are shown in the vicinity within a Bethany 1914, 1952, distance of 1 mile of the Property. Mountain House Creek is 1968 mapped south of the Property. Southern Pacific Railroad is mapped north of the Property. Unnamed roads are mapped in the areas nearby, and Byron Road is mapped north, adjacent to the Property in 1952. The Alameda and San Joaquin County boundaries are shown to the west as early as 1914. Old River is shown to the north of the Property. Property: The Property is unchanged. Adjoining: Scattered structures are shown in the vicinity within a 1916, 1940, distance of 1 mile of the Property. Roads are mapped in the Byron 1943 vicinity of the Property. Mountain House Creek is mapped south of the Property. Two pipelines are shown within approximately 1.5 miles of the Property. Old River is shown to the north of the Property with the first appearance of levees shown in 1940. Property: The Property is unchanged. Clifton Court 1968, 1978 Adjoining: Unnamed roads are mapped in the areas nearby, and Byron Forebay Road is mapped north. Other conditions are similar to those depicted on the previous map. Property: The Property is vacant, though is now within the Mountain House community. Clifton Court 2012 Forebay Adjoining: The Mountain House community is mapped, and residential streets are mapped around the Property. A fire department is mapped south of the Property, 2.3.2 Aerial Photographs The following aerial photographs, provided by EDR, were reviewed for information regarding past conditions and land use at the Property and in the immediate vicinity. These photographs are presented in Appendix D. ENGE0 April 20, 2020 —Expect Excellence-