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<br />Figure 12: Settled Water Turbidity <br /> <br /> .... <br /> l1.t <br /> .... <br />S' <br />~ 1.1 <br />.. <br />i <br />e 1.1 <br />~ <br />I- <br /> '.1 <br /> <br />Brown County WID No.'! <br />M a:xlmum Dally Settled Water Turbidity <br /> <br />.. ......~........ ............. ......... ............ ................... ....................... .... ... ............. ...... ......... ................... .............. ..... .......... ................ <br />, <br /> <br />... ....................................................,...................................................-....-..-..............._..~................. <br /> <br />,.. <br /> <br /> <br />" <br />...,t.", <br /> <br />''''I1.t <br /> <br />'""'" <br /> <br />"'"'" <br />D . 10',\ <br /> <br />t"..,., <br /> <br />'11'.", <br /> <br />')11"" <br /> <br />Figure 13: Settled Water Turbidity in Percent Frequency <br /> <br />l <br /> <br />Brown County WID No.1 <br />"Frequency Plol or M a:xlmum Dally Setlled W aler Turbidity <br /> <br />'.1 ..........__...................................................................--........................................................................---. <br /> <br /> <br />--...-..---.......---.--......-........----............----.................................................................................... <br /> <br />~.".,"'.".. 0.., <br /> <br />... <br /> <br />'" <br /> <br />It~ ".. <br />Perce.lace.r R..dl.C' <- T.rltld1lr Sill..... <br /> <br />It.. <br /> <br />B. Filters Without Post - Backwash Performance <br />The Texas Optimization Program requires that plants must collect turbidity samples at <br />least once every four hours from the effluent of each filter. The plant may collect the <br />filtered water turbidity data more frequently 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 regular intervals. Only the data collected when the filter is on line and <br />discharging to the clearwell is to be used. The program does not pennit data collection <br />when the filter is idle or when the filter operation is in the backwash mode. When <br />counting nwnber of the turbidity readings above 0.1 NTU and a nwnber above 0.5 NTUs, <br />the turbidity readings can be rounded to the nearest 0.1 NTU. Therefore, a reading of <br />