The Interval Upgraded Surface Water Treatment Principle.


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Choices That a System Using Alternative Filtration Technologies Can Consistently Achieve a 99 Percent ... (iv) Approval of Alternative Technologies and Setting Turbidity ...
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Slide 1

The Interim Enhanced Surface Water Treatment Rule

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Rule Summary Applicable To: Sanitary Surveys All Subpart H Systems All Other Provisions Subpart H Systems Serving 10,000 or More Persons

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Rule Summary (cont.) Provisions of Rule General Prohibition of Uncovered Finished Water Storage Disinfection Profiling and Benchmarking Sanitary Surveys Cryptosporidium Added to Definition of GWUDI Filtered Systems 2-Log Removal of Cryptosporidium Strengthened Turbidity Standards Individual Filter Monitoring/Reporting Follow-Up Actions Unfiltered Cryptosporidium Control

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Rule Summary (cont.) Compliance Dates Uncovered Finished Water Storage 60 Days (February 1999) Disinfection Profiling and Benchmarking "Early Requirements" Other Provisions 36 Months (January 1, 2002)

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Rule Structure

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Structure Part 141 National Primary Drinking Water Regulations Subpart A: General Subpart D: Reporting, PN, and Recordkeeping Subpart F: MCLGs Subpart H: Filtration and Disinfection Subpart L: Disinfectant Residuals, DBP, and DBPP Subpart O: Consumer Confidence Reports Subpart P: Enhanced Filtration and Disinfection

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Structure (cont.) Part 142 National Primary Drinking Water Regulations Implementation Subpart B Primary Enforcement Responsibility

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Provisions of the Interim Enhanced Surface Water Treatment Rule

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Subpart A – General § 141.2 Definitions Comprehensive Performance Evaluation (CPE) Disinfection Profile Filter Profile Ground Water Under the Direct Influence of Surface Water (Revised Definition) Uncovered Finished Water Storage Facility

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Subpart D and Subpart F Subpart D – Reporting, PN, and Recordkeeping § 141.32 Public Notification Amends Microbiological Contamination PN Requirements to Include Subpart P Violations Systems Will Eventually Be Required to Comply With the New Public Notification Requirements in Subpart Q Subpart F – MCLGs § 141.52 MCLGs for Microbiological Contaminants MCLG for Cryptosporidium … .. Zero

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Subpart H – Filtration and Disinfection § 141.70 General Requirements Subpart H Systems  10,000 Must Comply With Subpart P § 141.71 Criteria for Avoiding Filtration After 36 Months Systems  10,000 Must Comply With Stage 1 DBPR § 141.73 Filtration Conventional and Direct After 36 Months Systems  10,000 Must Meet New Turbidity Requirements Slow Sand and DE Performance Standards Unchanged Alternative Technologies State Established Performance Standards

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Subpart O – Consumer Confidence Reports § 141.153 Content of Reports Highest Single Turbidity Measurement Lowest Percentage of Samples Meeting Limits Conventional and Direct 1 NTU 0.3 NTU Alternative Technologies State Established Limits

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Part 141 – NPDWR Subpart P – Enhanced Filtration and Disinfection

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Structure Part 141 – NPDWR Subpart P – Enhanced Filtration and Disinfection § 141.170 General Requirements § 141.171 Criteria for Avoiding Filtration § 141.172 Disinfection Profiling and Benchmarking § 141.173 Filtration § 141.174 Filtration Sampling Requirements § 141.175 Reporting and Recordkeeping Requirements

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§ 141.170 General Requirements Subpart H Systems  10,000 February 16, 1999 Uncovered Finished Water Storage Facilities January 1, 2002 Treatment Technique Expanded to Address Cryptosporidium 2-Log Removal (Filtered) Watershed Control (Unfiltered) Addition of Requirements for: Profiling and Benchmarking

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§ 141.171 Criteria For Avoiding Filtration Watershed Control Identify Activities Monitor Activities State Determines Adequacy in Onsite Inspection Based on: Comprehensiveness of Watershed Review Effectiveness of Monitoring and Controls Maximization of Land Ownership and Control

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§141.172 Disinfection Profiling and Benchmarking A "Depiction" Ensures Microbial Protection 3-Step Process 1. Relevance Determination 2. Profiling 3. Benchmarking and Consultation Subpart H Systems Serving  10,000

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Why Develop a Disinfection Profile and Benchmark? SWTR Requires 3-Log Removal and/or Inactivation of Giardia Lamblia 4-Log Removal and/or Inactivation of Viruses A Regulatory Threshold to Be Achieved The Threshold Is Often Exceeded

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Why Develop a Disinfection Profile and Benchmark? IESWTR – (§141.172 Disinfection Profiling and Benchmarking) Requires Systems That Have Elevated DBPs to Show All the CT Available

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Why Develop a Disinfection Profile and Benchmark? Lake 1 Potential Chlorination Points 2 4 3 Filters To Distribution Flocculation Basins Sedimentation Basin Contact Basin

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Why Develop a Disinfection Profile and Benchmark? Measure Changes Against Actual Inactivation Consider: Positive and Negative Impacts Acute and Chronic Health Risks Alternatives Public Health Based Decision

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§141.172 Disinfection Profiling and Benchmarking Step 1: Applicability Determination Determine TTHM and HAA5 Annual Averages ICR Data Submit by January 1, 2000 Monitoring Complete by March 31, 2000 Existing Occurrence Data Submit by April 1999 A "More Representative Data Set" Go to Step 2 If Either Annual Average is > 80 Percent of MCL Systems May Go Directly to Profiling Notify the State by December 31, 1999

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§141.172 Disinfection Profiling and Benchmarking Step 2: Developing a Disinfection Profile Daily Inactivation Calculations Peak Hour 1 Year Minimum Throughout the Plant Completed by March 2001 Determining Inactivation Temperature pH (Chlorine) Residual Disinfectant Concentration (C) Contact Time (T)

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§141.172 Disinfection Profiling and Benchmarking Step 2: Developing a Disinfection Profile "In Lieu Of" Monitoring, Systems With 3 Years Existing Data Submit by March 31, 2000 Substantially Equivalent System Required to Monitor Until State Approves Data Systems May Use Such Data "In Addition To"

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§141.172 Disinfection Profiling and Benchmarking Step 2: Developing a Disinfection Profile Single Point of Application Single Calculation at First Customer Sequential Inactivation Calculations Multiple Points of Application Calculate Each Segment As Above Sum Disinfection Profile Must Be Kept for State Inspection

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§141.172 Disinfection Profiling and Benchmarking Step 3: Calculating a Disinfection Benchmark Before Significant Changes Can Be Made Calculate Benchmark Consult With State Significant Changes Include: Point of Application Disinfectant(s) Process Others Determined by State

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§141.172 Disinfection Profiling and Benchmarking Step 3: Calculating a Disinfection Benchmark Calculate Each Month\'s Average Calculate Benchmark Single Year\'s Data Lowest Monthly Average Multiple Years\' Data Average of Each Year\'s Lowest Monthly Average

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§141.172 Disinfection Profiling and Benchmarking Step 3: Calculating a Disinfection Benchmark Consulting With the State System Must Submit Description of Proposed Change Disinfection Profile Benchmark Analysis of Impacts

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§141.172 Disinfection Profiling and Benchmarking Summary of Timeframe 90 Days (April 1999) TTHM and HAA5 Data Collection 4 Months (April 1999) Submission of "Event" Data 12 Months (January 2000) Submission of ICR Data 12 Months (January 2000) Notification of Intent to Profile 15 Months (April 2000) If TTHM/HAA5 > 80% of MCLs, Begin Profiling 27 Months (March 2001) Disinfection Profile Must Be Complete Consultation Is Required Compliance Date Key Compliance Date

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§141.172 Disinfection Profiling and Benchmarking Profiling and Benchmarking Timeline Collection of TTHM and HAA5 Data Occurrence Data ICR Data Dec. 16, 1998 April 1999 January 2000 April 2000 March 2001 Collection of Profiling Data

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Workshop: Preparation of A Disinfection Profile and Benchmark

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Part 141 – NPDWR Subpart P (proceeded)

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§ 141.173 Filtration Conventional and Direct Filtration 0.3 NTU in 95 Percent No Greater Than 1 NTU Lime Softening Plants May Acidify Other Filtration Technologies Demonstration Required State Will Set Performance Standards

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§141.174 Filtration Sampling Requirements Conventional and Direct Filtration Plants Continuous Monitoring of Each Filter Record Results Every 15 Minutes Calibrate Turbidimeters Not a Treatment Technique Turbidity Excursions Trigger Actions—Not Violations Failure to Complete Follow-up Actions Creates Violations Informational

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§141.175 Reporting and Recordkeeping Conventional, Direct, and "Other State Approved" Filtration Technologies — Report by tenth of Month Combined Filter Effluent Number of CFE Measurements Number of Measurements  0.3 NTU Performance Standard Date and Value of Measurements > 1 NTU Maximum Level Individual Filter Effluent Maintain Individual Filter Results for 3 Years Report Individual Filter Results If "Follow-up Action" Is Triggered

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§141.175 Reporting and Recordkeeping Turbidity Excursions That Trigger Follow-up Actions: (1) > 1.0 NTU in 2 Consecutive Measurements (2) > 0.5 NTU in 2 Consecutive Measurements toward the End of 4 Hours of Operation After Backwashing or Taking Offline (3) > 1.0 NTU in 2 Consecutive Measurements in 3 Consecutive Months (4) > 2.0 NTU in 2 Consecutive Measurements in 2 Consecutive Months

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§141.175 Reporting and Recordkeeping (1) > 1.0 NTU in 2 Consecutive Measurements Actions: Record Filter Number, Turbidity Measurement, Date(s) Produce Filter Profile Within 7 Days (If No Obvious Reason) Report That Profile Has Been Produced (or Obvious Reason) Within 10 Days After the End of Month

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§141.175 Reporting and Recordkeeping (2) > 0.5 NTU in 2 Con

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