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`, <br /> Attachment C Pace 7 of B <br /> SIGMA CIRCUITS Inc. . CITATION DIVISION <br /> FIELD SITE <br /> TREATMENT UNIT OPERATION <br /> UNIT 2 <br /> SYSTEM TYPE: BATCH <br /> DESCRIPTION (Refer to Unit Block Diagram, Page 1 ) <br /> Waste Treatment Unit #2 consists of a batch treatment tank <br /> and a filter press. The same filter press is used for both <br /> Units 1 & 2. <br /> WTU2 is used for treating spent resist stripper, equipment <br /> cleaner, and other waste liquids containing metals above <br /> discharge limits. <br /> Design : <br /> This unit is connected to Unit 1 as shown on Page 1 of the <br /> Unit Block Diagram. <br /> The unit is within the same bermed area as Unit 1 (see <br /> Attachment 1 ) . The entire system rests at ground level . <br /> A) The Batch Treatment Tank (BTT) is a 500 gallon conical <br /> polypropylene tank about 2 years old . It is equipped <br /> with a mechanical mixer plus inlet lines for waste to <br /> be treated ; chemical addition lines, such as acid , <br /> caustic, and other specialty chemicals; and a pH <br /> electrode for process monitoring purposes. <br />