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Stage 1 D/DBP Rule Elements U.S. EPA Regulation Effective 2002

Stage 1 D/DBP Rule Elements U.S. EPA Regulation Effective 2002. Maximum contaminant levels Trihalomethanes (THMs) less than 80 ug/L Haloacids less than 60 ug/L Regulated as system-wide average Treatment technique Enhanced coagulation (TOC control) Alternative compliance criteria.

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Stage 1 D/DBP Rule Elements U.S. EPA Regulation Effective 2002

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  1. Stage 1 D/DBP Rule ElementsU.S. EPA Regulation Effective 2002 • Maximum contaminant levels • Trihalomethanes (THMs) less than 80 ug/L • Haloacids less than 60 ug/L • Regulated as system-wide average • Treatment technique • Enhanced coagulation (TOC control) • Alternative compliance criteria

  2. Limit in 2000 (~25%) Needed Blend ? Additionaltreatment needed 100% CRW 100% SPW Water Blend Determining Operating Strategy

  3. Water Quality and Treatment Responseto Control DBPs and DBP Precursors • Reduce SWP blend (2000) • Increase coagulant & acid dosage • Reduce chlorine dosage • Increase solids handling capacity • Delay chlorination to filter influent • Complete ozone retrofit (2009)

  4. Chlorine Chlorine Increase coagulant & acid dose Reduce plant influent chlorine Delay chlorination to filter influent only Chlorine Treatment Configurations for Increased SPW Blends Ammonia, Caustic soda Coagulant, Acid RAPID MIX FLOCCULATION/ SEDIMENTATION FILTRATION

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