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ARCADIS Ms. Donna DeMartino April 17, 2013 Background The site is located at the southeast corner of North Wilson Way and East Fremont Street in Stockton, San Joaquin County, California (see Figures 1 and 2). The site includes approximately 4.5 acres and is bounded by the following streets: East Fremont Street to the north, North Wilson Way to the east, and East Lindsay Street to the south. According to information provided in a 2010 Phase I Environmental Site Assessment (ESA) report prepared by Bureau Veritas North America, Inc. for the site, the site was developed as the RTD bus facility during the late 1970s and has been utilized as a bus repair, servicing, and refueling facility. The facility utilizes vehicle wash bays, a hazardous waste storage area, gasoline and diesel fuel pumps, and eight (8) current USTs, 18 service bays along the north and south portions of the building, one service bay in the northeast corner is a former paint booth which is no longer in operation, and one service bay in the southwest corner historically operated as a steam bay (Bureau Veritas North America, Inc.2010). Reportedly, the eight USTs contain diesel fuels (four USTS), unleaded gasoline (one UST), transmission fluid (one UST), and virgin motor oil (one UST) and waste oil (one UST; SJCEHD 2012). The waste oil "spill buckets," in the form of covered ports within the servicing bays, discharge waste oil to the waste oil UST via underground piping. The service bays are equipped with floor drains and a floor drain trench that reportedly are connected to a three-stage clarifier, prior to discharge to the sanitary sewer. The bus wash bay is also equipped with a three stage settling pond system which is part of the clarifier system and collects wash water and recycles the water for reuse within the wash bay. Some drains within the wash bay also discharge to the three-stage clarifier. File Review ARCADIS reviewed publicly available files at the San Joaquin County Department of Environmental Health (SJCDEH) on April 8, 2013. In general, the SJCDEH has the following documentation relating to the Site: • Reports for the routine annual inspections conducted at the Site that pertain to the USTs as well as the use and storage of hazardous materials; • Various permits and fees paid for the USTs by the SJRTD; and, • Historical information related to the USTs that were removed from the Site in 1990 and 1992. Page: FINAL 2013-04-17-Report SJRTD Bus Depot..doc 2/8