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<br />combinations of polymers/coagulants. The coagulant type and dosage rated were <br />changed based on the chemical testing program. <br /> <br />The plant develope~ an operating procedure which adjusted the variable speed <br />flocculators based on water characteristics and the developed "operating matrix". <br /> <br />Every operating shift had the responsibility and authority to make the necessary <br />operational adjustments. <br /> <br />The filters were evaluated on an individual filter basis and a unique down ramping time <br />for each filter was developed. Figure 16 gives a typical filter post-backwash turbidity <br />profile. <br /> <br />To swnrnarize the operational modifications for the optimization program they consisted <br />of: <br /> <br />(1) Chemical additives evaluation program. ., <br />(2) Development of an "operating matrix" for chemical addition and changing water <br />quality. <br />(3) Development of individual filter profiles and operating procedures for each unique <br />individual filter. <br />(4) Empowering all operating shifts with the responsibility and authority to make the <br />necessary operational adjustments. <br /> <br />~ <br /> <br />In. FINDINGS <br /> <br />A. Sedimentation Basin Perfonnance <br />The Texas Optimization Program's performance goals for sedimentation basin <br />performance is that all of the turbidity readings from each basin be less than or equal to <br />2.0 NTUs. This is not a recognition criteria for the program, but is a reporting <br />requirement Plants must collect turbidity samples at least once each day from the <br />effluent of each sedimentation basin. These samples must be collected with the basin in <br />operation. The plant may collect settled water turbidity data more frequently ~an once <br />each day, i.e., once each shift or once every four hours. However, the sampling should <br />occur at the same rate throughout the month and at regular intervals when the basin is <br />operating. The program monthly operating report allows counting the number of turbidity <br />readings above 2.0 NTU and the nwnber above 5.0 NTU rounded to the nearest 0.1 <br />NTUs, and allows for rounding of the percentage above 2.0 NTU to the nearest 0.1 <br />percent The monthly operating report also requires reporting of maximum NTUs and <br />minimWTI NTUs for settled water. (4) Figure 12 presents a graphical plot of the settled <br />water turbidity during the recognition period and Figure 13 depicts the percent frequency <br />of occurrence ofNTU values. <br />As depicted from the graphs, the plant maintained about 80 percent of the performance <br />goal limit of2.0 NTUs. <br />