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<br />Figure 11: Finished Water Turbidity in Percent Frequency <br /> <br />B ro w n Co 1.1 n ty W ID No.1 <br />.F.,requency Plot of M axlrn urn Daily Finished Water Turbidity <br /> <br />........ ................. .......................... "'............................. ........ ......... -....... ........ ~........... .............................................................- ....... ..... <br /> <br />.... <br /> <br /> <br />I,e ............................................................................................._... <br /> <br />... <br /> <br />h <br /> <br />II. <br /> <br />... <br /> <br />". <br /> <br />rcrc:C.hCe.r R..dl.CI c- Turbldlly Sbow. <br /> <br />The CPE identified the follo\ving performance limiting factors: <br />. The existing turbidity meters were not accurate at low turbidity readings. <br />· There was no policy in effect 'at the time to require changes in operation when target ) <br />optimization goals were exceeded. <br />· The alarm point for turbidities were not set at target optimization goals. There was no <br />redundant backwash pump nor rapid mix motor. <br /> <br />This initial CPE became the baseline for the plant operating staff to establish its Texas <br />Optimization program goals and could be used to assess the program's effectiveness. It <br />should also be noted that the data compiled during the CPE was based upon the existing <br />turbidity meters, which were determined to be inaccurate at low readings. These meters <br />were immediately replaced with more sensitive and accurate turbidity meters 09 each <br />filter. . <br /> <br />c. Program Investment <br />The major program investment was the replacement of outdated turbidity meters with <br />new more accurate meters. The old meters had reached their useful life and were <br />scheduled for replacement. The reporting requirements were incorporated into the <br />normal plant operating duties and had no significant effect on the plant operator's <br />schedule. <br /> <br />D. Operational Modifications <br />After. the initial CPE assessments, the District embarked on its optimization program. <br />The initial phase was to assess the chemical addition. Extensive jar testing was <br />conducted for several months to establish an "operating matrix" for chemical addition <br />based on changes in water pH, alkalinity, and temperature.. <br /> <br />The jar testing program also tested several types of coagulants and polymers and hybrid <br />