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• . • Page 2 of 2 <br /> To operate the 300 scfm GAC with change out every two (2) months the influent TPI-Ig concentration would need <br /> to be near 150 ppmv, and every three months the influent TPHg concentration would need to be near 100 ppmv. <br /> Please call to discuss at your earliest convenience. <br /> Thank you, <br /> Matt Hanko <br /> Geocon Consultants, Inc. <br /> ph: 925-371-5900 <br /> cell: 925-785-5021 <br /> 12/8/2003 <br />