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• SWMU No. 1 - Manufacturing Area: Concrete floor epoxy coated inside warehouse appear to be intact and separate site usage from potential result of past waste generating operation within the warehouse and groundwater conditions do not indicted a release from past operations. • SWMU No. 2 - Holding Tank and Sump Area: End of the grated trenches for waste water pipe secondary containment currently filled with sediment laded water and recent soil sample data collected north of the sump did not indicated release of waste. • SWMU No. 3 — Waste (water) Treatment Area: North side of building secondary containment currently filled and capped with concrete and recent soil sample data collected within SWMU did not indicated release of waste. • SWMU No. 4 — Hazardous Waste Storage Pad: Northeast appears clean and no residual waste was present during the 2004 inspection. • SWMU No. 5 — Former Wastewater Treatment Unit Area: Deep concrete, epoxy coated pit approximately 20 feet deep, 50 feet wide and 150 feet long with tank support of concrete for treatment of wastewater by former owner/tenant Shinko. Historical soil/groundwater did not indicated release of waste. Closed by the EHD and City of Manteca. Groundwater samples collected surrounding the base depth of the pit (20 feet) demonstrate, historically and contemporaneously, that no release from the operation treatment unit has impacted the subject property. • SWMU No. 6 — Former Bulk Chemical Storage Area: Shallow concrete pit, 50 feet wide and 150 feet long with tank support of concrete for storage of chemical used to process metals, decontaminate freshwater, treatment of wastewater by former owner/tenant Shinko. Historical soil/groundwater did not indicated release of waste; Closed by EHD and DHS. • SWMU No. 7 - Underground Holding Tank at the Pre -Sewer Discharge Sump Area: Connection pipe to the City of Manteca (concrete vault surrounding). Wastewater was treated to standard acceptable for Manteca and therefore not hazardous. Recent soil sample data collected east and west of the sump did not indicated release of waste. The results of laboratory analysis identified levels of contaminants below their respective Federal and State regulatory standards/screening levels or at concentrations below laboratory reporting levels. The results of soil sampling and analysis indicate no identifiable source or significant residual contamination in subsurface soils within the unsaturated zone that represent a current or future threat to groundwater. • Similarly, no significant groundwater impacts have been identified, with the exception of a single sample (SB1-W, discussed above) collected in June 1995. Subsequent soil and groundwater sample analysis did not reveal a surface release or significant impact to groundwater. In addition, although several metals (arsenic, chromium, copper, nickel, and zinc) and VOCs (chloroform, toluene, and xylenes) were detected Statement of Basis for Former Advanced Interconnect Technologies, Inc. Facility Page 13 of 16