Stage 2 Disinfection By-Products (DBP’s) - PowerPoint PPT Presentation

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Stage 2 Disinfection By-Products (DBP’s) PowerPoint Presentation
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Stage 2 Disinfection By-Products (DBP’s)

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Stage 2 Disinfection By-Products (DBP’s)

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  1. Stage 2 Disinfection By-Products (DBP’s) A guide to Compliance

  2. Outline • Stage 2 DBP Background • Compliance monitoring plans • Monitoring requirements • Sample rejection policies • Compliance assistance • Helpful hints

  3. Stage 2 Terminology • Dual Sample – Both TTHM and HAA5 samples required at same time and place • CMP - Compliance Monitoring Plan- Plan outlining where system MUST take Stage 2 samples • LRAA – Locational running annual average – the average of analytical results for samples at a particular monitoring location during the previous four calendar quarters.

  4. Stage 2 DBP background • Stage 2 builds on requirements of Stage 1 Dpb and targets systems with the greatest risk, Changes HOW MCL’s for total trihalomethanes and haloacetic acids ARE CALCULATED • Intended to reduce potential cancer, reproductive and developmental health risks from dBP’s in drinking water • Systems are required to conduct evaluations of their distribution systems to identify the locations with the highest dbp concentration • Stage 2 applies to community and non-transient non-community systems that disinfect with primary or residual disinfectant (other than UV Light)

  5. Why Now? • WHY Now? 1 system 1 system 5 systems 273 systems

  6. Summarized Stage 2 Requirements

  7. Stage 2 requirements • DATA USED TO ESTABLISH STAGE 2 ROUTINE MONITORING (Compliance monitoring) • INITIAL Distribution system evaluation – system with higher population and/or known dbp issues • Standard monitoring – one year of increased monitoring for TTHM and HAA5 • System specific study – use extensive existing data or prepare hydraulic model • Other systems with low population and/or low dbp levels • Waivers- no idse required • Stage 1 monitoring

  8. Compliance monitoring plans • All systems required to conduct compliance monitoring must develop a compliance monitoring plan • Monitoring locations • Monitoring dates • Compliance is based on a Locational Running Annual average (LRAA) • Stage 2 DBP compliance monitoring requirements vary according to source type and population served

  9. What changes impact the data process? • Locational Running Annual Average (LRAA)  • specific individual sample points • Increased focus on monitoring during month of Highest DBP concentration  • samples are required to be taken in specific month/s • Systems cannot sample outside the required month/s to make up for samples that were missed

  10. COMPLIANCE Sample Rejection policies for Stage 2 • We will reject samples collected from the wrong locations • We will Reject samples collected during the wrong month • We will Reject sample results without a travel blank if there is a detect of tthm at or above 0.5ug/L • We will Reject a portion of a dual sample if only the tthm or haa5 is required for a location or time • We may Reject a tthm or haa5 alone from a location / time where a dual sample set is required; please contact your local dec office • Special samples that are not for compliance will be accepted if notification is provided to dec prior to the samples being submitted

  11. DW Program compliance assistance • We will make information available to the labs to assist with sample acceptance issues • Individual system information from the CMP • Spreadsheet with system information on required location and sample time period • We will be available to answer questions regarding sample locations • We will be available to answer questions regarding sample time period • We will make decisions on accepting samples without travel blanks • Annual monitoring summaries posted on Drinking water watch will include stage 2 dbp monitoring after march 31, 2014

  12. Helpful hints • Send sample kits for dbp’s the first week of the month of required sampling • Pre-fill out the chain-of-custody form with the exact sample locations for tthm and haa5 samples • Make sure the kit contains the correct bottles and a travel blank for TTHM’s • Call your local dw Program office if you have any questions regarding sample location or sample time period • Call your local DWP office prior to rejecting samples