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San Joaquin Delta Community College District Draft Environmental Impact Report for Master Plan Implementation September 2006 Underground Storage Tanks (USTs) The campus appears to support (or have supported) seven or more USTs. The location of four of these tanks is unknown and contents of one is also unknown (EDR 2005; Delta College 2006). The contents of six known historic LISTS on campus are summarized below in Table 3.6-2. Three of the tanks were known of by the college and their locations have been noted. The locations of the other three are unknown (Delta College 2006). There is also a high potential for additional tanks as it is unknown whether the Stockton State Hospital Farm Annex utilized USTs. Table 3.6-2. UST on Campus Diesel Fuei 1,000 gallons Shima Ag Yard 1973 (�111A Waste Oil 500 gallons Shima Ag Yard 1973 Unleaded Gasoline 1,000 gallons Shima Ag Yard 1973 Regular Fuel 2,000 gallons Unknown 1973 Waste Oil 500 gallons Unknown 1974 Unreported 500 gallons Unknown 1974 Sources: EDR 2005;Delta College 2006. One LUST containing gasoline was reported on campus on December 5, 2000. The leak was detected in the process of closing the tank. The site was not tested for MTBE (EDR 2005). Soil Contamination The campus is thought to have extensive areas of potentially contaminated soils. In particular, some of the parking lot berms are believed to have been constructed from demolition waste of the original buildings, and as such, these berms may encapsulate substantial amounts of hazardous materials, particularly old building materials such as lead pipes, paint, and asbestos, along with medical waste which may be classified as bio-hazardous. Old-fashioned needles and medical bottles, transit piping, water pipes, and a gas tank were previously found in the berms during previous excavation activities in these areas (Braungardt and Miele 2005). In Particular, the Holt and Cunningham berms have the potential to contain hazardous waste (Delta College 2006). However, the true extent of historic soil contamination on the campus is unknown, but has the potential to be extensive. For example, during the recent construction of the Microscopy Center, historic debris was encountered which slowed project construction and required remediation activities (Delta College 2005). In addition, on November 18, 1997, a Ramos Oil gasoline delivery truck's hoses were improperly connected, causing a spill onto gravel. A backhoe was reportedly brought in and contaminated soil was removed (to a depth of about 10 inches) until the smell was no longer present. All removed soil was bioremediated, tested, and the treated soil was used as backfill at the spill location (Delta College 2006). Page 3-91