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Soil and Groundwater Investigation Report Catellus Property September 2006 TAOC pipeline system was constructed in 1907,and like the OVP,transmitted heated crude oil from Bakersfield to the Bay Area. The TAOC pipeline was abandoned in the 1970s. In addition,two active pipelines exist in the UPRR ROW. These include the Kinder-Morgan pipeline and the Chevron Pipeline Company's Bay Area Products Line(BAPL). 2.3 EXISTING AND PLANNED DEVELOPMENT The Catellus property is currently undeveloped,however the property is found within the sphere of influence of the City of Tracy General Plan and is designated Urban Reserve 4. The General Plan notes this area will be developed for industrial,commercial,and office uses near Interstate 205 (1-205),with some low-density residential uses located further away from the highway. In addition,Caltrans and the City of Tracy Public Works Department are developing plans for a potential 1-205 Interchange Reconstruction Project on the Catellus property,where construction is tentatively scheduled to begin in 2011. SAIC reviewed three recommended build alternatives,each of which would involve significant construction activity along West Byron Road. SAIC has also provided feedback to the City of Tracy Public Works Department,regarding areas of affected soil and groundwater, as they relate to the build alternatives. 2.4 HYDROGEOLOGIC SETTING The site is located within the Tracy Sub-Basin of the San Joaquin Valley Groundwater Basin(Number 5-22.15). This sub-basin is defined by the aerial extent of unconsolidated to semi-consolidated sedimentary deposits that are bounded by the Diablo Range to the west,the Mokelumne and San Joaquin rivers to the north, the San Joaquin River to the east,and the San Joaquin-Stanislaus County line to the south. The Tracy Sub-basin is comprised of continental deposits of late Tertiary to Quaternary age,which include the Tulare Formation,older alluvium,flood basin deposits,and younger alluvium. The thickness of these deposits ranges from a few hundred feet in the western foothills to about 3,000 feet near the eastern margin of the basin. The Tulare Formation is comprised of semi-consolidated,poorly sorted, discontinuous deposits of clay,silt,and gravel. The Corcoran clay is situated near the top of the Tulare Formation,separating groundwater in the basin in what has been reported as two primary aquifers. The upper aquifer is reported to range in thickness from 15 to 250 feet below ground surface(bgs),and the lower aquifer is reported at 600 feet bgs. Generally,depth to groundwater in the Tracy Sub-basin varies from 5 to 10 feet bgs(Department of Water Resources [DWR],Update 2003,Bulletin 118). Locally,the site is situated at an elevation approximately 35 feet above mean sea level. The topography gently slopes to the northeast. During the soil and groundwater investigations completed at the former Tracy Pump Station to the north and for the Tracy Byron Road project to the south,shallow groundwater was encountered between 10 and 20 feet bgs. 2.5 PREVIOUS ENVIRONMENTAL ACTIVITIES SAIC is unaware of any environmental investigations or activities that have occurred on the site. Investigations have been performed for the Tracy Pump Station project located immediately to the north of the site,and the Tracy Byron Road project located immediately to the south. Additional investigation activities are currently being planned for these projects. July 2005 Environmental Data Resources(EDR)Search of Environmental Databases. In July 2005, SAIC contracted EDR to search federal,state,and local environmental records in order to determine any on-site or off-site environmental conditions associated with Chevron petroleum pipelines and/or other third-party sources. Based on review of the search results,no environmental conditions that could affect the Catellus site were identified within a 1-mile search distance,except for the following: F; 2 From Science to Solutions