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Phase I Environmental Site Assessment Neighborhoods D,K,L,and Town Center,Mountain House,California Page b feet above msl, and for Town Center approximately 50 feet above msI. The general topographic gradient of the area is to the northeast and the terrain is relatively flat with the exceptions of the Mountain House Creek areas in Neighborhoods K and L and in Town Center. The site reconnaissance revealed large berm areas and soil stock piles along either side of Mountain House Creek and on the northeastern portion and areas of the southern portion of Town Center. The Federal Emergency Management Agency (FEMA) map indicates that the areas of Neighborhoods K and L bordering.Old River are partially located in the 100-year flood zone (Figure 4,Appendix A). 2.3 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 the following: Stomar clay loam and Stomar clay loam (wet), very deep and well drained soils derived from sedimentary rock sources; Pescadero clay loam- partially drained, a very deep, poorly drained saline-sodic soil derived from sedimentary rock sources; Willows clay, a very deep,poorly drained, saline-sodic soil derived from mixed rock sources; Merritt silty clay loam, a partially drained soil derived from mixed rock sources; Reiff Ioam, a very deep and well drained soil derived from mixed rock sources; Capay clay, a very deep, moderately well drained soil derived from mixed rock sources; and Vernalis clay loam, a very deep, well drained soil derived from mixed rock sources. (all soil types with 0 to 2 percent slopes). The Site is located approximately three miles to the northeast of the Midway Fault. 2.4 CURRENT USES OF THE PROPERTY The.San Joaquin County Assessor's Office 'indicates APNs 209-030-03 and —04; 209-040-09, -14, and -17;209-050-09; 209-170-02; and 209-450-11 are owned by Trimark Communities, Inc. APN 209-450- 12 is owned by Isabel F. Oliveira and APN 209-450-13 -is owned by Mary Maria Rocha (both are in Neighborhood D). Site reconnaissance revealed that most of Neighborhood D is used as agricultural land with some construction areas along the northern boundary and two rural homes along the southern boundary. ant Line Road). Neighborhood K is mostly agricultural land. Neighborhood L includes agricultural(Grant lands and former agricultural lands currently being.used to facilitate construction and . development of the town of Mountain House and Mountain Houge Creek. Town Center is made up of former agricultural lands currently being used to facilitate construction and development of the town of Mountain House and Mountain House Creek. 2.5 DESCRIPTIONS OF STRUCTURES,ROADS,AND OTHER IMPROVEMENTS ON SITE The Site is and has been used foragrrcultural purposes with some areas currently being used to facilitate construction and development of the town p of Mountain House and Mountain House Creek. Dirt farm/construction roads were noted throughout the Site properties as well as irrigation waterways (open, underground, and concrete lined). Site reconnaissance revealed that most of Neighborhood D is used as agricultural land(possibly harvested wheat) with some construction areas along the northern boundary. Water to the agricultural fields is y .. �"a CONDOR