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Figure 11: Finished W ater Turbidity in Percent Frequency <br />Brown Councy W ID P7o.1 <br />Frequency Plot of M aximum Daily Flnished W ater Turbidity <br /> <br /> <br /> <br /> <br /> <br />e..a..be<.f'ae.el.e~ -Turelenlse. •r• n• ~r.w <br />The CPE idenrified the following performance limiting factors: <br />• The existing turbidity meters were not accurate at low turbidity readings. <br />• There waz no policy in effect•at the rime to require changes in operation when tazget <br />optimizarion goals were exceeded. <br />.'Ihe alarm point for turbidiries were not set at target oprimization goals. There was no <br />redundant backwash pump nor rapid mix motor. <br />This inihal CPE became the baseline for the plant operating staff to establish its Texas <br />Oprimizarion program goals and could be used to azsess the program's effectiveness. It <br />should also be noted that the data compiled during the CPE waz bazed upon the existing <br />rurbidity meters, which were determined to be inaccurate a[ low readings. These meters <br />were_immediately replaced with more sensirive and accurate turbidity meters on each <br />filter. I <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The major program investment was the replacement of outdated turbidity meters with 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 sigiificant effect on the plant operator's <br />schedule. <br />D. Operational Modifications <br />After the initial CPE assessments, the District embazked on its oprimization program• <br />The inirial phase waz to assess the chemical addirion. Extensivejar 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 />Thejaz testing program also tested several types of coagulants and polymers and hybrid <br />