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cR Stockton Unified School District Geological and Environmental Hazards Assessment #" CSU-Stanisiaus,Stockton Campus School Site Page 23 7.2 GEOLOGICAL HAZARDS ASSESSMENT A geological hazard investigation was performed in accordance with portions of California Education Code § 17212 requirements. The purpose of the investigation was to examine the site for potential geologic hazards that could limit the intended use of the land or have significant impacts on development +� costs. The following tasks were completed for this investigation. • Performed a geologic reconnaissance to examine potential bedrock outcrops and soil exposures w. within the site. V Reviewed maps, reports, and other published documents relevant to the geology, seismic setting, and geotechnical conditions of the site and its surrounding area. �. • Prepared the geologic hazards section of this report which specifically addresses the following: • Anticipated subsurface conditions • Seismic and fault hazards including liquefaction potential w.. • Presence of compressible or expansive soils • Potential for flooding 0 Stability of slopes %,. • Mitigation of any identified potential geologic hazards 7.2.1 Site Conditions t- The site is located in Stockton, San Joaquin County, and is shown on the Stockton West, California U.S. Geological Survey (USGS) 7.5 Minute Topographic Quadrangle Map dated 1987. The site consists of land located north of East Park Street, east of North Stanislaus Street, south of East Acacia Street, and West of North Aurora Street. The site consists of a running track, roadways, multiple buildings, parking areas, and landscaped areas. The site is shown on Figures 1 through 7 contained in Appendix A. 7.2.2 Geologic Setting The project area is located in the Great Valley Geomorphic Province, with an elevation ranging from approximately 15 to 17 feet above ms[, in the north central San Joaquin Valley. The site coordinates are 4 approximately Latitude 37.9627° North and Longitude 121.2830 West. The San Joaquin Valley is a northwest-trending, structural depression, filled with up to six vertical miles of lithified non-marine and 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 lesser degree,the Coast Range Mountains to the west. w, The Coast Range Mountains generally consist of northwest trending ridges with Franciscan Assemblage and granitic basement rocks. The Sierra Nevada Province is an asymmetric range, with a steep fault- bounded eastern front and gentle western slope that dips under the sediments of the Great Valley to the west. The bedrock complex of the Sierra Nevada Mountains generally consists of metamorphosed sedimentary and volcanic rocks of Palcozoic and Mesozoic age (150 to 300 million years old) and plutonic rocks (chiefly granitic types)of Mesozoic age(80 to 150 million years old). Structurally, the Coast Range — Sierra Nevada Block Boundary Zone, a regional geological boundary separating Franciscan basement rocks of the Coast Range from granitic basement rocks of the Sierra Nevada Range, is present at depth near the western margin of the Great Valley Geomorphic Province. V LW CANDOR