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%Moe .•i Facility and PBR Units Closure Work Plan .. 1848 and 1856 Field Ave., Stockton, California • December 2001 — On behalf of Tyco, Earth Tech performed the sampling and analysis program detailed in the Facility Closure Plan. • January 2002-Tyco submitted to the County the Facility Closure Characterization Summary, 1848 and 1856 Field Avenue, Stockton, California (the Characterization Summary)(Earth Tech, 2002). This report described the results of the sampling and analysis program in the Facility Closure Plan ` and concludes with the language"a work plan for further characterization and/or remediation of soil exceeding cleanup goals will be prepared." 2.0 1848 FIELD AVENUE 2.1 Use History r The building located at 1848 Field Avenue(also known as"Building I")contained most of the wet process areas for the facility,including a pre-clean acid scrub, a multibond line,two develop-etch-strip(DES)lines, and chemical storage and waste treatment areas.The waste treatment areas included two fixed-treatment units (FTUs) that are permitted under the "Permit by Rule" (PBR) tier of California's tiered hazardous waste treatment permitting system. 1848 Field Avenue also contained some dry process areas and offices.A site plan for 1848 Field Avenue is shown on Figure 2. The wet process areas were used as follows.The mulfibond line was a series of baths with copper-containing etch that was used to roughen the surface of the boards so that lamination could be applied.The mulfibond line was located near the center of the 1848 Field Avenue building in a room alongside the western wall.The two DES lines were located in the southern portion of the building and also consisted of a series of chemical baths that contained developer (potassium carbonate), cupric chloride etch, and resist stripper (mainly sodium hydroxide,potassium hydroxide and monoethanolamine)solutions. The large room containing the DES lines also contained the waste treatment area for the facility.Adjacent to the DES lines and waste treatment area, ` there were three separate 4,500-gallon aboveground storage tanks used for the bulk storage of sodium chlorate, spent etch and hydrochloric acid. The waste treatment area in the south end of the building contained two PBR waste treatment units that were used for the on-site treatment of aqueous waste with metals,acids and bases generated from the manufacturing process.The two PBR units were"Unit#I",a continuous treatment system,and"Unit#2",a batch treatment LAWORM690991GenerarField WPiField Ave WPAug03 rev2.doc 3 August2003