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V <br /> Attachment C Page 7 of 8 <br /> SIGMA CIRCUITS Inc . , STOCKTON 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 8 years old . It is equipped <br /> with a mechanical mixer , inlet lines for waste to be <br /> treated , and chemical addition lines , such as acid , <br /> caustic , and other specialty chemicals . <br />