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( Stockton Unified School District Geological and Environmental Hazards Assessment # CSU-Stanislaus,Stockton Campus School Site Page 18 . Regionally, the upper 3,000 feet of Great Valley alluvial sediments are indicative of the Sierra Nevada ` granitic basement rocks to the east and, to a lesser degree, the Coast Range marine and non-marine sediments and Franciscan and granitic basement.rocks to the west. i According to published geologic maps, surface deposits underlying the site consist.'of arkosic alluvium belonging to the Modesto Formation. Unconsolidated alluvial sediment rests upon several thousand feet Of upper Cretaceous marine sedimentary rock belonging to the Great Valley Sequence. The United:States Department of Agriculture Soil Survey of San Joaquin County, California, 1992, classifies the site surface soils as Jacktone— Urban Land Complex. The Jacktone—Urban Land Complex is comprised of clays and clay loams that have.a high shrink-swell potential, slow permeability rate, and low strength. The site soils ,are characterized as having a moderate to high expansion potential. The site is shown on Figures I through 7 contained in Appendix A. 5.3 EXTERIOR OBSERVATIONS The site currently consists of a track and field in the northeastern quarter; storage buildings, a designated historical building, and a PG&E electrical station in the southeastern quarter; a parking area, a road, a sewer screening station, a restroom facility, a residence, and a drug abuse-recovery housein the southwestern quarter; a park area in the northwestern; quarter; and along the eastern road, several # abandoned buildings. The site has historically been used for institutional purposes. There are six roads on the site. Three of these are east-west oriented: E. Acacia Street!forms the narthern j boundary; E. Park Street forms the southern boundary; and E. Flora Street is the southern boundary for the track and field and gently curves to the southwest after it passes west of N. Grant°Street. Three of the roads trend north-south: N. Aurora Street is located alongthe eastern boundary; N. Grant Street bisects ry' the site; and a portion of N. Stanislaus Street is the western site boundary. Sidewalks are located:along F most of the roads. Underground sprinklers are located throughout the site, and an underground street lighting system connects. the street lamps located throughout the site. Several fire hydrants are located' along the roads, and the site is serviced by varyingsystems as follows: underground "gravity-fed sewer Y g rpotable water, stone drain, electrical, telephone, natural gas, and a steam tunnel system:. A track and field is located in the northeastern quarter and is bounded by N. Acacia;Street, N. Aurora Street,E. Flora Street, and N. Grant Street. There are bleachers located on the western side of the track. Three storage buildings (one brick one concrete and one metal), a historical building,g, and a PG&E distribution station are located south of E. Flora Street in the southeastern quarter. A truck weight scale is located to the west of the brick storage building (circa 1860s), and a raised sidewalk is located along the northern side of the three connected storage buildings. Two fire hydrants are located on the pavement area east of the sidewalk. Three groundwater-monitoring wells are located in the pavement. Mr. Meunier indicated that this area is the site of a current UST soil and groundwater investigation and clean-up. L Fourteen 55-gallon drums were located against the northeastern corner of the building. According to Condor, these are filled with soil cuttings and groundwater from the installation and sampling of the Lf monitoring wells. An electrical switching station (non-.PCB containing) was also located in this area. Bin piles of composted soil (the bin was indicated as having been used for asphalt), clean fill dirt, and a scrap- metal pile containing metal shelving are located along the eastern side of the building. An empty, plastic,- 5 5-gallon lastic,55-gallon drum was located in the concrete compost bin. Stockpiles of dirt with concrete debris were U0 located along the southern boundary fence fine. A cyclone fenced-in area containing a large PG&E- owned distribution transformer was located between the building and Park Street; this approximately j 50,000-volt distribution transformer provides power to the site and other areas of the entire parcel via I i CONDOR i