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VARIANCE Pursuant to Section 25143, Chapter 6.5, Division 20 of the Health and Safety Code (HSC) , the Department of Toxic Substances Control (Department) grants a variance to the applicant below as specified: I. BACKGROUND 1) Identifying Information: Operator Indy Electronics, Inc. 400 Industrial Park Drive Manteca, California 95336 Contact: Mary L. Clark Olin Corporation (615) 336-4579 2) Project site: 400 Industrial Park Drive Manteca, California 95336 3) Project Description: Indy Electronics (Indy) is a contract assembler of integrated circuits. From February 1989 to March 1993 , Indy operated as a subsidiary of Olin Corporation (Olin) , located at 544 .Industrial Park Drive, Manteca, CA. On March 11, 1993 , Olin sold Indy the integrated circuit business, but retained ownership of the MQUAD anodization and stamping operations. as related to integrated circuit manufacturing. Indy generates corrosive wastewaters from the various plating and cleaning rinses. These wastewaters are pH adjusted in a series of tanks. The treated wastewater is discharged to the City of Manteca under Permit No. 88-1. Processes generating the wastewater include tin plating, solder dip, MECO plating, and MQUAD anodization. Indy operates under a fixed treatment unit (FTU) permit-by-rule (PBR) treatment permit, initially submitted to the Department on January 27, 1992, and revised, after being sold by Olin, on March 30, 1993 . As part of the business transaction, Olin continued to operate the MQUAD anodization process line within the Indy building complex in addition to leasing an adjacent building (544 Industrial Park Drive, Manteca, CA ) for administration and stamping operations. A .separate wastewater treatment system was constructed adjacent to Indy to treat wastewaters from theOlin anodization process. Olin operates the wastewater. treatment 1