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Figure 12: Settled Water Turbidity I <br />Brown County W ID No.l <br />r[az(mum Daily Settled W ster Turbfdlty <br />. <br /> <br /> <br /> <br />~ <br /> <br />~ <br /> <br /> <br />` <br />~ <br />a <br />? <br /> <br /> <br />~ <br /> <br />; <br />. <br />~o.t.N <br />Fiwre 13: Settled Water Turbidity in Percent Frequency y <br />Brown County W ID Na. 1 <br />Frequency Plat of M aximum Daily Settled W ater Turbid(ty <br /> <br />. <br /> <br /> <br />u r. 1e.~.[e.r1a..al.t• <-'r.rsialp'sl. n• n. ~ <br />B. Filters Without Post - Baclcwash Performance <br />The Texas Oprimization Program requires that planis must collect turbidity samples at . <br />least once every four hours from the effiuent of each filter. The plant may collect the <br />filtered water turbidity data more frequendy than once every four hours, i.e. once an hour <br />or once every 15 minutes. However, the samples must occur at the same rate throughout <br />the month and at regilaz intervals. Only the data collected when the filter is on line and <br />dischaz;ing to the clearwell is to be used. The program does not permit data collection <br />when the filter is idle or when the filter operation is in the backwash mode. When <br />counting number of the turbidity readings above 0.1 NTU and a numbec above 0.5 NTUs, <br />the turbidity readings can be rounded to the nearest 0.1 NTU. Therefore, a reading of <br />