2002-081-RES ACCEPT PROPOSAL OF FREESE & NICHOLS FOR PROFESSIONAL ENGINEERING SERVICES FOR PRODUCTION STUDY OF WATER TREATMENT OF COP

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The Texas Optimization Program recognition criteria establishes the following reporting requirements: For each clarifier/sedimentation basin . total number turbidity readings . number ofsettIed water readings above 2.0 NTU . percentage of settled water turbidity reading above 2.0 NTU . number. of settled water readings above 5.0 NTU . maximum turbidity level recorded . mini~U?1 turbidity level recorded For each filter (excluding any data collected during the first 30 minutes following a backwash j cycle) . total number turbidity readings . number of filtered water readings above 0.1 NTU . percentage of filtered water turbidity readings above 0.1 NTU . number of filtered water readings above 0.5 NTU . maximum turbidity level recorded ., . minimum turbidity level recorded For each filter profile: . date that the special'study on post-backwash turbidity profile was initiated . maximum turbidity level recorded during the first 30 minutes of filter run . turbidity level exactly 15 minutes after the filter is returned to service . turbidity level exactly 30 minutes after the filter is returned to service . maximum turbidity level recorded during the remainder of the filter run l For raw and finished water: . daily raw water turbidity . finished water turbidity every 4 hours The program requires at least once each month, a post-backwash turbidity profile be conducted on each filter. During this profile, the turbidity data must be collected during the entire filter run using a on-line turbidimeter with a continuous recorder. For the first 30 minutes of the filter run, data must be collected at one minute intervals. After ~O minutes, the sampling must be conducted at least once every 15 minutes. The program also recommends the following additional monitoring: . The pH and alkalinity of raw water entering the plant should be monitored once every four hours. . 'The pH and alkalinltY of the effluent of the rapid mix (or at some other site just ahead of coagulant addition) should be monitored every four hours. . The pH at a point located just after pH adjustment (for example, jtist after lime, soda ash, or caustic addition) to be monitored every four hours. The program allows the use of on-line particle counters or particle monitors instead of on-line turbidity meters provided that the participant is able to demonstrate that the particle count numbers for their particular plant is equivalent to a turbidity ofless than 0.1 NTU. It is still required that at least one portable turbidimeter/recorder for monthly filter profiling be provided. (1) (2) (3)