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30 May 2000 AGE-NC Project No. 97-0372 Page 6 of 17 2.4.1. Plating Bath Area The plating bath area in the southern portion of the building consists of an eastern bermed area and a western area. Two sumps were located in the area, one still open in the SW corner, one backfilled with concrete in the NW corner. The western area included a nickel and gold plating area and a solder flux room, as can be seen on Figure 2. Processes conducted in both areas are believed to have included metal etching and nickel, chromium and copper plating. The concrete flooring was etched in the eastern plating area, and more locally in the western plating area. A patch of the etched concrete flooring in the western area covered a portion of an expansion joint between concrete slabs, thereby providing a potential pathway to the subsurface. The bermed plating area was utilized for waste water storage after the sewer connection was cut off by the City of Stockton in June 1993. Waste water was allowed to accumulate directly on the floor, according to Mr. Doug Wilson of the PHS-EHD. According to Mr. John Hinkel, standing water was not accumulated on the concrete floor. In either case, chemicals of potential concern include the metals cobalt, copper, nickel, lead and tin. Locally, high or low pH conditions may be a concern. 2.4.2. Solder Flux Room In the southeast corner of the building, in the comer of the metal plating area, is a room utilized for soldering. Details of the operation are not known to AGE, but Mr. Wilson of the PHS-EHD noted to AGE that lead contamination of the concrete walls and floor was a concern in the room. 2.4.3. Treatment/Chemical Storage Area The treatment/chemical storage area contained low concrete-secondary containment structures and four sumps, three of which have been abandoned by filling with concrete at the time of preparation of this work plan. The area was utilized for the waste water treatment system. The specifics of the chemical storage in the area are not known to AGE, but probably included materials for the water treatment system, metals solutions and corrosives for the plating processes. Chemicals of potential concern include the metals cobalt, copper, nickel, lead and tin. Locally, high or low pH conditions may be a concern. 2.4.4. Material Preparation Room North of the eastern plating room is a material preparation room. A large area of concrete is oil- stained from a piece of machinery. A concrete-filled abandoned floor drain is in the area. Material Advanced GeoEnvironmental,Inc