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Attachment C Page b of 8 <br /> SIGMA CIRCUITS Inc. , CITATION DIVISION <br /> FIELD SITE <br /> TREATMENT UNIT OPERATION <br /> UNIT 1 (Continued ) <br /> J ) If the metals are below discharge limits , the contents <br /> of the full accumulation tank are pumped to the FRD <br /> (see Unit Block Diagram, Attachment C-1 , Sheet 1 ) . If <br /> the metal concentration in the tank is too high, the <br /> contents are pumped back to the WRT for re-treatment. <br /> K) Developer rinses and spent developer baths are pumped <br /> to the DRT. These rinses and bath dumps are then <br /> slowly metered by gravity feed to the FRD. <br /> L) The treated water in the FRD from the accumulation <br /> tanks (Steps I & J ) and developer rinses & bath dumps <br /> (Step K) is pH adjusted with mixing , then discharged to <br /> the city sewer through a 4 leader pipe and a 4" <br /> Palmer-Bowlus flume to measure the flow rate and <br /> accumulate the total gallons through the system. Final <br /> monitoring for pH takes place in the FRD. <br /> M) The sludge that collects at the bottom of the <br /> clarifiers is pumped into the SATT, and then , after a <br /> suitable settling time, to the filter press. The <br /> excess water that is pressed out of the sludge is fed <br /> back into the WRT to go through the CWTS again . <br /> N) After each sludge run , the filter press is opened up <br /> and the sludge scraped off the plates into the bin . <br /> When this bin is full , it is transferred directly to <br /> reusable plastic bins for shipment offsite. These bins <br /> are stored in the outside bermed area and are regularly <br /> picked up and shipped to a recycler for metals <br /> recovery . <br /> UNIT 2 <br />