ARCHIVED REPORTS_XR0011995 - Laserfiche WebLink

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L Stockton Unified School District f Geological and Environmental Hazards Assessment t CSU-Stanislaus,Stockton Campus School Site f. Page 26 on the site property. Insulating oil containing 5-499 ppm PCB was indicated in the chemical inventory 'received from OES for PG&E-Aurora Substation. During the site reconnaissance, switching stations labeled as non PCB-containing were identified on the site. A 50,000-volt electrical distribution station (PG&E) is located along the southern site bound and e. .showed no signs of leaks Stockpiles of soil with g p concre#e debris and old budding and furniture debris were observed on the southeastern corner of the site. Functioning sprinkler, street lighting, fire hydrant, storm drain, electrical, telephone, natural gas, and gravity-fed sewer systems are located throughout the site as well as a steam tunnel system that has had a tunnel collapse in the recent past: Several buildings, both occupied and unoccupied, are all pre-1970s. Herbicides have been used on the park area and track and field area. A gravity-flow sewer screening station is located along the southern site boundary. The location of a former UST, currently the subject of ground water and soil investigation, is located.along the eastern site boundary. One of the storage buildings located in the southeastern portion of the site contains a hydraulic elevator. The possibility of asbestos- and/or lead-'containing products in some of the buildings should be noted due to the age of the buildings. Fourteen 55-gallon drums containing soil and y around water associated with the former UST are located along the northeastern side of the storage building. The site questionnaire respondent indicated that the electrical switching stations had contained PCB-containing oil in the past. Aerial photographs, historical topographic maps,. and site folklore indicated that a building used to occupy the area that is now a track and field; folklore indicates that ' demolition debris is buried under the fill in the current track and field. f Additional services included the review of other information sources. Site reconnaissance and review of S.NAPCD files indicated the presence of emergency generators that, when used, will emit hazardous air pollutants. The generators are located on the adjacent eastern property. No pipelines under the State Fire Marshal's jurisdiction were identified. i Gas line plans provided by PG&E indicate a 2-inch plastic low-pressure natural gas line supplies the site from American Street and a %2-inch service line extends north along Stanislaus Street from a natural gas line located underground on the south side of Park Street. According to both the plans provided by PG&E and the facilities maintenance maps, natural gas pipelines are located throughout the site. The PG&E plans also indicate that PG&E has not maintained the natural gas distribution system since 1934 and that three abandoned gas wells are located two blocks southeast of the site. DOGGR maps indicate that one plugged and abandoned gas well is located on the site's eastern boundary, three plugged and abandoned gas wells are located approximately 800 feet southeast of the site and one plugged and abandoned gas well is located 500 feet west of the site, respectively. According to the topographic map, aerial photographs, and site reconnaissance,the nearest railroad tracks t to the site are located approximately 300 feet to the east of the site. A sewer screening station located on. the site property was observed during the site reconnaissance. No geologic or seismic hazards were identified that are likely to impose significant constraints on the . proposed site use. The potential for fault rupture is considered remote, and the.,potential for soil liquefaction due to seismic shaking is low. Mitigation of seismically induced settlement',should be limited to minor strengthening of foundation and slabs. Slope gradients are low, and the potential for slope failure is considered non-existent. The potential of site inundation from flooding of nearby watercourses or failure of reservoirs is considered relatively low. The near-surface soils appear to be moderately to highly i. compressible or expansive. We recommend a Geotechnical Engineering Study be completed to further {� assess site-specific soil conditions in accordance to Title 24 prior to design and construction of the proposed site improvements. a CONDOR