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NW <br /> Attachment C Page 3 of 8 <br /> SIGMA CIRCUITS Inc. , CITATION DIVISION <br /> FIELD SITE <br /> TREATMENT UNIT OPERATION <br /> UNIT 1 (Continued ) <br /> H) The filter press is a hydraulic ram plate-type press <br /> and has a nominal capacity of 2 cubic feet . The press <br /> contains 11 plates with removable filter cloths on each <br /> face of the plate. During filtration , sludge is <br /> trapped between the cloth-covered plates and the excess <br /> water squeezed out by the hydraulic ram. The press has <br /> a steel bin underneath it to catch the sludge when the <br /> plates are opened. <br /> I ) The transfer tank is a 100 gallon polypropylene tank <br /> about 7 years old . It serves as a feed tank to the two <br /> accumulation tanks. <br /> J ) The two accumulation tanks are polypropylene tanks with <br /> a nominal capacity of 2500 gallons each and are about 2 <br /> years old . These tanks are equipped with appropriate <br /> filters and pumps for receiving treated wastewater from <br /> the clarifiers. Plumbing arrangements enable the <br /> contents of one tank to be re-circulated and mixed for <br /> sampling while the other is filling . <br /> K) The Developer Receiving Tank (DRT) is a 100 gallon <br /> square polypropylene tank about 7 years old . It is <br /> used to receive the non-metal bearing waste from the <br /> dry film and solder mask developers. <br /> L ) The Final Receiving & Discharge Tank (FRO) is a 250 <br /> gallon square polypropylene tank about 7 years old . It <br /> is equipped with a pH monitor for final monitoring , pH <br /> adjustment, and alarm. It is also equipped with both <br /> acid and caustic delivery lines for pH adjustment . <br />