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<br />collected in intervals at I5-minute intervals. Plants may decrease the sampling intervals, <br />i.e., increase the sampling frequency. The turbidity readings can be rounded to the <br />nearest 0.01 NTU. The filter profile must depict the maximum spike after backwash for <br />each filter showing the maximum turbidity level recorded during the first 30 minutes of <br />filter operation. For each filter, the turbidity level is recorded every 15 minutes after the <br />filter is returned to service following a backwash cycle. The turbidity levels recorded <br />exactly 30 minutes after the filter is returned to service are also reported. (4) Figure 16 <br />shows a typical filter profile graph. It should be noted that the backwash spike did not <br />exceed the 0.3 NfU post-backwash turbidity spike criteria <br /> <br />Figure 16: Filter Profile Graph <br /> <br />0'.5 ''''''''''''':11 C'l'ultpH:II1tr.~ . <br /> <br />: i01~t:~llJa't; <br />~ ,~4~\~I~,~,"f~i~~i~~i~~' <br /> <br />;;~::;'...'I';;~_': <br /> <br /> <br />. u_." ..... . <br />.:.... .....": ...~. <br />. . .. .:- :::~.:. .': .: ~: :... . ;': <br /> <br />. -, .. <br />., ..... .... ..... .. <br />.. ..,' ":.::::":::":". -\;:. .... .::::... <br />. ..... . . .... -. ... <br /> <br />.. ...'.. ..< .h <br />.. . .... <br />..... . <br /> <br />f''':"'"-:-.::c' <br /> <br />":.: ....... <::: ':',' <br /> <br />- .. . : ,:; ~ ~ :: = :. ~ ~ : J .: .& :. ; :: .;: '; ':' :;, .~ :" ~ :: : :I S <br /> <br />Figure 17: Finished \Vater Turbidity <br /> <br />.... <br /> <br />Brown County WID No.1 <br />Maximum Daily Finished Water Turbidity <br /> <br />"'.' <br /> <br />s- <br />.. <br />?:. <br />i I.U <br />~ <br />, <br />.. <br /> <br />IU <br /> <br />.... <br /> <br />... <br />""1111' <br /> <br />"'JI " , <br /> <br />,.""., <br />o .t, <br /> <br />1111"" <br /> <br />11IUtl' <br /> <br />'1I1U.' <br /> <br />"'.'19' <br /> <br />') <br /> <br />... <br />