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Based on a review of historical documents, the property was first developed in 1977, and was occupied by Moduline Industries, Inc., a mobile home manufacturing company. The property was purchased by Shinko Electric America, Inc. (Shinko) in 1982, at which time a fixed waste water treatment system was constructed adjoining the northern end of the main building. Shinko utilized the facility to stamp and plate lead-frames used in the assembly of semiconductors, from 1982 until operations ceased in 1990. Wastewater treatment was conducted under a permit from the City of Manteca. Later operations were conducted with a permit by rule (PBR) under notification for permitting (CAD070889142) from the California Department of Health Services (DHS). After Shinko ceased operations, and completed closure of their production facility, Shinko proceeded with closure of the PBR with the San Joaquin County Environmental Health Department (SJCEHD), through an underground storage tank closure permit inspection report, and under a building/public works permit with the City of Manteca (finalized June 6, 1991). A noted memorandum from the DHS Toxic Substances Control Program, dated July 31, 1990, indicated that DHS acknowledged the process, and that DHS would need not review or issue approval of a permit closure based on the oversight by the SJCEHD and the City of Manteca. Property records indicate that the property was vacant from October 1994 to November 1995. Between November 1995 and October 1998, the eastern portion of the property had been leased by Olin Corporation as Olin Interconnect Technologies (OIT) from John and Kristie Polimeno and Concord General Corporation. On October 23, 1998, AIT entered into a sublease agreement with CIT. Operations in the western portion of the building structure were by Elegant Surfaces, makers of cultured marble/stone products. AIT conducted the similar on-site operation as OIT. Wastewater was processed through an above ground fixed wastewater treatment system, constructed directly adjoining the northern end of the main building. A PBR was requested by OIT on May 11, 1995, and a permit was issued by DTSC on July 25, 1995 (CAR0000002279). Currently, the Site is an approximately 7.16-acre parcel developed with a steel pre- engineered warehouse-type building constructed in 1977. Three side structures have since been attached for office space and a cafeteria. The Site includes a water treatment system (inactive since 2004), designed to process city well water into filtered DI water, and the on-site of recycling of process water. Effluent reclamation included heavy metal recovery, cyanide removal, with a sludge press and dryer. The western side of the Facility continued to be occupied by Bishop Industries doing business as Elegant Surfaces and Stone Center of California until late 2012. Elegant Surfaces and Stone Center of California businesses are closed and no business is being conducted at the Site. 3. ENVIRONMENTAL SETTING The property is situated within the Great Valley Geomorphic Province of California, a large, elongate, northwest trending, asymmetric structural trough. The Great Valley Province has been filled to its present elevation with thick sequences of sediment ranging in age from Jurassic to Recent, creating a nearly horizontal alluvial plain, extending from the Tehachapi Mountains in the south to the Klamath Mountains in the north. Western and eastern boundaries of this province are comprised of the California Coast Range and Statement of Basis for Former Advanced Interconnect Technologies, Inc. Facility Page 4 of 15