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ATC SITE SAFETY PLAN FACILITY BACKGROUND The site is located at 400, 544, and 560 Industrial Park Drive in Manteca, in the southwestern quarter of Section 4, Township 2 South, Range 7 East, San Joaquin County, Califomia. The site is presently occupied by ISE Labs Inc. and is utilized as a semiconductor manufacturing facility. April 1988 -Wastewater Treatment System Soil Sampling - In April 1988, several soil samples were collected beneath a former line from the plating shop to the wastewater treatment system. Soil samples were analyzed for pH, copper, lead, and tin. Elevated levels of tin were detected November 1988 - Subsurface Investigation - On November 11, 1988, six soil borings were advanced on the subject property and converted into monitoring wells under the management of Woodward-Clyde. December 1995 - Wastewater Treatment System Closure - The final volume of wastewater was treated on September 18, 1995 by the former MQUAD anodization and wastewater treatment system. Treatment equipment was subsequently dismantled and water washed by Olin Interconnect Technology (OIT) personnel to remove residues. Tanks and associated equipment were then moved off-site and reassembled. Advanced Environmental Technical Services (AETS) of Hayward, California performed initial decontamination of the former WWTC on November 8, 1995. On December 4, 1995, scrubbing and rinsing of the compound walls was repeated by AETS to remove cleaning residues that remained on the walls. Closed UST - The PHS/EHD file contained documentation of a UST near the northwest corner of the main building. This UST was originally installed in 1980 to supply fuel to the facility's backup emergency generator. However the tank was never utilized and remained empty until it was abandoned-in-place in 1992. The UST was filled with 16 cubic yards of pea gravel by Cen-Cal Services Inc. of Manteca, California. No testing of the underlying and adjacent soils and groundwater was conducted in conjunction with this closure. Surface Stain- During a May 1998 site visit conducted by ATC, a relatively large oil surface stain was observed on the asphalt surface at the eastem portion of the site. This stain appears to be associated with a spill from a piece of machinery temporarily stored on-site. The estimated volume of the original surface spill is 5 to 10 gallons. WORK PLAN ATC will perform a soil gas survey of the site's suspect areas including the existing and former water treatment compounds. Direct push technology will be employed to advance soil gas probes to desired depths where soil gas will be extracted and sampled. It is anticipated soil gas samples will be collected at depths of approximately 7 to 14 feet below ground surface(bgs). To assess subsurface conditions beneath the tank, ATC will employ a direct push drill rig and advance one angled soil boring beneath each end of the tank to a depth of approximately 15 feet below ground surface (bgs). Soil samples will be collected every 5 linear feet and field screened with a portable Photoionization Detection (PID) meter for the presence of volatile organic vapors. Three soil borings will be advanced in the vicinity of the surface stain. One soil sample will be collected from each boring at a depth of 4 feet bgs to assess whether cleanup of the surface stain has been completed PAGE