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Phase I Environmental Site Assessment Proposed Mountain House Preschool and Multi-Purpose Buildings 54 West Conejo Court,Mountain House,CA Page 3 2.1 LOCATION AND LEGAL DESCRIPTION The Site parcel comprises approximately 3 acres designated as APN 254-260-480 located in a primarily residential area. The Site is depicted in the Site reconnaissance photographs (Appendix B) and in Figures 1 through 3 (Appendix A). The sources used for determining the physical setting of the Site were the GeoCheck® Physical Setting Source Summary, provided by EDR" (Appendix C), the USGS Clifton Court Forebay, California 7.5- Minute Topographic Map dated 2012 (Figure 1, Appendix A), information from the current Federal Emergency Management Agency(FEMA)Flood Insurance Rate Map(FIRM)and Site reconnaissance.The property is included on the 2012 Clifton Court Forebay, California USGS 7.5-minute quadrangle, within Section 9, Township 2 South, Range 4 East, Mount Diablo Base and Meridian, at approximately North Latitude 37.7675 and West Longitude -121.5482. The average elevation of the Site is approximately 90 feet above mean sea level(amsl). The Site is located in the northern portion of the San Joaquin Valley in the town of Mountain House, approximately 6.18 miles northwest of the City of Tracy. West Conejo Court adjoins the northern portion of the Site, Central Parkway adjoins the eastern portion of the Site,and Mustang Way adjoins the southern portion of the Site. The Site is approximately 1.37 miles southwest of the Union Pacific Railroad tracks. Old River is approximately 2.4 miles northeast of the Site.Mountain House Creek is located approximately 0.4 miles northwest and Wicklund Cut is approximately 1.7 miles northeast of the Site. The Alameda-San Joaquin County Line is located approximately 2,300 feet west of the Site. Clifton Court Forebay is located approximately 2.8 miles northwest of the Site. The nearest major roadway is Interstate 205 located approximately 1.6 miles south of the Site. The FEMA FIRM map indicates that the Site is within Zone X: areas determined to be outside the 0.2 percent annual chance floodplain. 2.2 SITE GEOLOGY The project area is located in the Great Valley Geomorphic Province in the central-western portion of the San Joaquin Valley. The San Joaquin Valley is a northwest-trending, structural depression, filled with up to six vertical miles of lithified marine and non-marine sediments, and unlithified non-marine sediments. Regionally,the lithology of the upper 3,000 feet of sediments is indicative of uplift of the Sierra Nevada to the east and,to a lesser degree,the Coast Range Mountains to the west. According to published geologic maps, near-surface sedimentary deposits underlying the Site consist of Quaternary alluvial fan deposits and the Dos Palos Alluvium. These gravel, sand, and/or silt deposits/sediments are derived primarily from rocks of the Coast Range. The United States Department of Agriculture mapped the soil types at the Site as predominantly Stomar clay loam and Stomar clay loam (wet),very deep and well drained soils derived from sedimentary rock sources and Capay clay,a very deep, moderately well drained soil derived from mixed rock sources. The Site is located approximately three miles to the northeast of the Midway Fault. An Arnaudo Bros. plugged dry gas production well is located approximately 1.23 miles north of the Site and a Phillips-Santucci-Bvk plugged dry gas production well is located approximately 1.47 miles northeast from the Site. An active Pacific Gas & Electric natural gas transmission line is located approximately 0.9 miles east of the Site and an active Chevron Pipeline Co.hazardous liquid pipeline is located approximately 1.37 miles northeast of the Site. 2.3 CURRENT USES OF THE PROPERTY San Joaquin County Assessor's Office property use for the Site is indicated as vacant. Based on Site reconnaissance,the Site is vacant with weeds. iia CONDOR