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The Wastewater Treatment Unit Area was located in an epoxy coated pit approximately 20 feet deep by 50 feet wide and 150 feet long. All waste water was treated in plastic compatible tanks followed by a solids press operation. The tank system included five tanks on individual concrete pedestals. All piping associated with the treatment process was above ground and monitored by visual observations. Solid waste generated from the process was stored in 55 -gallon drums and transferred to the Hazardous Waste Storage Pad (SWMU No. 4) for temporary on-site storage prior to off-site disposal. The Wastewater Treatment Unit was operated by Shinko between 1982 and 1990. The all tanks, piping and supporting equipment associated with SWMU No. 5 have been removed and inactive since closure of Shinko operations in 1991. SWMU No. 6 - Former Bulk Chemical Storage Area The Former Bulk Chemical Storage Area was used for storage of chemicals used to process metals, decontaminate freshwater, and treatment of wastewater in support of Shinko operations. SWMU No. 6 was located north of the facility, and between the adjoining SWMU No. 4 to the east and the adjoining SWMU No. 5 to the west (see Figure 2). The Wastewater Treatment Unit Area was located in an epoxy coated pit approximately 25 feet deep, 50 feet wide and 150 feet long. All piping, tanks (13 poly tanks ranging in size from 564 gallons to 9,000 gallons) and support equipment associated with the former bulk chemical storage area was located above ground and monitored by visual observations. SWMU No. 6 was operated by Shinko between 1982 and 1990. All tanks, piping and supporting equipment associated with SWMU No. 6 have been removed and inactive since closure of Shinko operations in 1991. SWMU No 7 - Underground Holding Tank at the Pre -Sewer Discharge Sump Area The underground holding tank at the pre -sewer discharge sump was used to discharge treated wastewater in support of Shinko, OIT and AIT operations. SWMU No. 7 wastewater inlet is located near the northeastern corner of the facility, with the discharge point into the City of Manteca industrial sewer line located under Carnegie Street. The vault is epoxy coated concrete with a secondary containment system. The holding tank and pre -sewer discharge sump was used by Shinko between 1982 and 1991; by OIT between 1995 and 1998 and then by AIT between 1998 and 2003. Decommissioning of waste and products associated with SWMU No. 7 was conducted by Safety Clean under the oversight of SJCEHD. AOC No. 1 — Monitoring Wells (MW) No. 1 No. 2 and No. 3 Three ground water monitoring wells (MW -1, MW -2 and MW -3) were installed at the Site in the early 1990s, as part of a subsurface investigation conducted by Shinko. The wells were reportedly sampled semi-annually as part of the secondary containment system monitoring, until approximately 1999. The monitoring wells were not destroyed following the investigation, and were rediscovered in a subsequent investigation. Following completion of the 30 -day public review and comment period, the three monitoring wells were destroyed on March 13, 2013 under permit and oversight by the SJCEHD. Final inspection and approval was provided by SJCEHD on March 18, 2013. AOC No 2 — Elegant Surfaces Temporary Chemical Storage Area An area used for drum and container storage was observed during the October 2012 site visit. The area was located near the northern property boundary, north of the Resin Press Area. Several of the drums were noted to be empty, while others were storing waste Statement of Basis for Former Advanced Interconnect Technologies, Inc. Facility Page 8 of 15