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• Hydroxide Monitoring <br />As noted during past discussions with the Division, CEC has <br />conducted hydroxide monitoring as part of the program in the past. <br />However, based upon discussions with ACZ laboratories, it is our <br />understanding that hydroxide values are simply a calculation based <br />upon the titration testing done for alkalinity. Given that ACZ <br />keeps laboratory results for a seven year period, and that <br />hydroxide values could be calculated from the alkalinity testing <br />information kept on record, previous data values can be obtained if <br />needed. According to ACZ, there is rarely any hydroxide present <br />unless the pH exceeds 10.0, and based upon standard methods there <br />can not be any hydroxide unless the pH is greater than or equal to <br />8.3. As such, CEC has historically shown monitoring values of zero <br />for most sampling instances. Given that the hydroxide is not <br />considered to be a significant item of concern based upon past <br />monitoring, CEC ceased monitoring and reporting of hydroxide <br />• values as part of TR 94-23. <br />• <br />TR 94-23 Ex.29-4a Revised 3/14/94 <br />