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75 <br /> m <br /> a <br /> a <br /> MAXIMUM CHROMIUM <br /> o CONCENTRATION ALLOWED <br /> FOR DISCHARGE <br /> s <br /> � 50 <br /> z <br /> o • <br /> u <br /> L <br /> L <br /> 0 <br /> u 5 PPM HEXAVALENT <br /> CHROMIUM <br /> w CHROMIUM CONCENTRATION CONCENTRATION <br /> AT 80% DESIGN THROUGHPUT TO SYSTEM INLET <br /> x <br /> w <br /> = 25 <br /> z <br /> _ j <br /> J <br /> 4 <br /> 4 I . <br /> W <br /> DESIGN • <br /> 80% DESIGN THROUGHPUT <br /> THROUGHPUT <br /> 0 <br /> 0 2 4 6 8 10 <br /> SYSTEM THROUGHPUT, MILLIONS OF GALLONS <br /> 0 5 10 15 20 25 <br /> DAYS OF OPERATION BETWEEN REGENERATIONS FIGURE 2 <br />