Self-Sustaining Validation: The Nation s First Water Loss Audit Certification Program

Transcription

1 Self-Sustaining Validation: The Nation s First Water Loss Audit Certification Program Presented by: Tory N. Wagoner, P.E./P.L.S. Director of Operations, Cavanaugh tory.wagoner@cavanaughsolutions.com

2 No water loss reporting Rudimentary water loss reporting AWWA M36 terminology & metrics AWWA M36 software AWWA M36 software with validation (Level 1) WA ME OR CA NV ID UT AZ MT WY CO NM ND SD NE KS OK MN WI IA IL MO AR MS IN MI TN KY AL OH GA WV SC VA NC NY NH CT RI PA DRBC NJ MD DE MA AK TX LA FL HI

3 3

4 Full Scale Water Loss Training & Technical Assistance Programs Under regulatory framework Multiple Tracks Extended touchpoints of technical assistance Multiple phases over several years GA

5 Georgia Water Loss Program Phasing Following 2008 Drought, the Water Stewardship Act was Passed into Law Annual Auditing Begins, Initial Workshops WLC Committee Formed & Manual Developed Phase 1: Statewide Training on Water Auditing Phase 1A: Validation of Audits Phase 2: Statewide Technical Assistance Projects (Small Systems) Phase 1B: Validation of Audits Phase 2A: Statewide Technical Assistance Projects (Small Systems) Phase 1C: Audit Certification Program Phase 2B: Statewide Technical Assistance Projects (Large Systems) 5

6 Background for the Certification Program EPD Rules Chapter Establishes requirement for annual water audits to include documentation on the basis of the audit, and to include a certification statement from a Qualified Water Loss Auditor (QWLA) QWLA must examine the audit and certify it meets the requirements to be described in the Georgia Water System Audits & Water Loss Control Manual (Georgia Manual) QWLA defined as an individual having completed a basic water loss auditing course approved by the Division and who demonstrates the knowledge, skills and ability to validate water loss audits in accordance with the Georgia Water System Audits and Water Loss Control Manual. Other requirements Water Loss Control Program by July 2016 Demonstration of Progress

7 AWWA Water Audit Data Initiative Started in 2011

8 WRF #4372B: WATER AUDITS IN THE UNITED STATES: A REVIEW OF DATA VALIDITY AND RESULTS WRF #4639: ESTABLISHING WATER UTILITY GUIDANCE AND METHODOLOGY FOR WATER AUDIT VALIDATION

9 QWLA Training Program - Validation Levels Water Audit Data Validation Levels* Level Description Validation Focus Typical Activities Level of Effort Depends on: Effort Self-reported N/A N/A N/A N/A Filtered High level screening Compare audit results toscreening criteria Small Defined screening criteria 1 Top down data review validation Data grades, data validity score, gross errors and anomalies in the metrics Desktop review of what is immediately available supply reports, consumption reports, testing reports, etc. Compiler listing of multiple years of water audit data for the utility. One to two hour phone call to interview utility staff, plus preparatory and documentation time. Interview questions are focused on practices to make sure the data grades have been applied correctly and consistently. Via this discussion, anomalies are discussed and either confirmed, corrected, or need for further investigation noted. Small System size & complexity, accuracy and completeness of available reports and documentation 2 Top down data mining validation Supply and consumption volumes from existing data that is mined, at the component and sub-component levels Data mining for desktop analysis of non-revenue water components. Analysis of available data, including production database and reports from SCADA system to identify gaps in the data chain. Data mining in the billing system to confirm and cleanse consumption volumes to remove redundancies from the data mining process which can come about from record duplications. Also validates exclusion of non-potable volumes in the totals. Validates that consumption volumes from low mid and high level detail extractions are corroborated. Analysis of available meter testing data for audit calculations. May apply 95% confidence limits to the AWWA water balance. Medium Complexity of supply setup, metering setup and billing setup. Analysis could be limited to only one or two of the three primary assessments: water supplied volume, customer metering, and billing records. 3 Bottom up field investigation validation Supply and consumption volumes from new data that is field gathered or mined Field investigations and extensive data mining. Supply meter testing and in-field verification of meter-transmitter-scada data chain. In field customer meter testing. Night flow measurement & analysis to discern leakage flowrates. Pressure and leakage data collection & analysis. Large Varies widely by system, largely on how much field work is deemed necessary to assist NRW reduction goals.

10 Georgia QWLA Program DESIGN OBJECTIVES KEY DESIGN ELEMENTS: CONSIDERATION FOR SELF-CERTIFICATION STRUCTURE/LENGTH OF THE COURSE & EXAM PROTOCOLS FOR QUALITY CONTROL OF CERTIFICATIONS EXPIRATION OF STATUS, CONTINUING EDUCATION DELINEATION OF ROLES STATE DNR & GAWWA WLCC

11 Georgia Manual Content Proposed new content: NEW SECTION Data Validity This new section will describe the definition of validation levels, methodology, minimum standard of care, and minimum standards of documentation for performing a validation review of an AWWA water loss audit. NEW SECTION Conducting the Validation Review This new section will provide the step by step method (checklist approach) for conducting the validation review, including what needs to be documented. REVISED SECTION 3 Planning a Water Loss Control Program This amended section will include information about implementing a water loss control program as required in Rule , by July 2016 AMENDED SECTION 4 Supplemental Information This amended section will include templates for the minimum standards of documentation described in the new section. This section will also include a template for the certification statement referenced in Rule , that is required to accompany a submitted AWWA water loss audit.

12 QWLA Training Program Methodology Step 1 Obtain audit & supporting documents - documents provided - documents missing contact auditor to obtain missing documentation AWWA Free Water Audit Software: User Comments Use this worksheet to add comments or notes to explain how an input value was calculated, or to document the sources of the information used. WAS v5.0 American Water Works Association. Copyright 2014, All Rights Reserved. 2 Initial Screening of Audit Metrics - run Compiler Software (if multiple years) run screening - no flags from screening - wrong units, missing data notify auditor: correct units and complete data input - real loss volume < 0 return to auditor, or dig into documentation to find the error? - other flags from screening use this to guide your investigative review in steps 2 through 6 3 Review Water Supplied - follow checklist document answers - look for common pitfalls - analyze documentation against grades document recommended edits as applicable - analyze documentation against inputs document recommended edits as applicable 4 Review Authorized Consumption - follow checklist document answers - look for common pitfalls - analyze documentation against grades document recommended edits as applicable - analyze documentation against inputs document recommended edits as applicable 5 Review Apparent Loss - follow checklist document answers - look for common pitfalls - analyze documentation against grades document recommended edits as applicable - analyze documentation against inputs document recommended edits as applicable 6 Review System Data - follow checklist document answers - look for common pitfalls - analyze documentation against grades document recommended edits as applicable - analyze documentation against inputs document recommended edits as applicable 7 Review Cost Data - follow checklist document answers - look for common pitfalls - analyze documentation against grades document recommended edits as applicable - analyze documentation against inputs document recommended edits as applicable 8 Final Screening of Audit Metrics - final screening of Performance Indicators for reasonableness - watch for unusually low (<1.0) or high (>20.0) Infrastructure Leakage Index (ILI) values - Is NRW Cost greater than 100% of System Operating Costs? 9 Assemble supporting documents & validation form General Comment: Audit Item Volume from own sources: Vol. from own sources: Master meter error adjustment: Water imported: Water imported: master meter error adjustment: Water exported: Water exported: master meter error adjustment: Billed metered: Billed unmetered: Unbilled metered: Unbilled unmetered: Unauthorized consumption: Customer metering inaccuracies: Systematic data handling errors: Length of mains: Number of active AND inactive service connections: Average length of customer service line: Average operating pressure: Total annual cost of operating water system: Customer retail unit cost (applied to Apparent Losses): Variable production cost (applied to Real Losses): Comment 10 Complete water loss audit certification statement for EPD submittal

13 10-Step Methodology for Level 1 Validation 1.Obtain water audit and supporting documents 2.Initial screening of audit metrics 3.Review the components of the Water Supplied Volume 4.Review Authorized Consumption 5.Review Apparent Losses 6.Review System Data 7.Review Cost Data 8.Final Screening of audit metrics 9.Assemble water audit file and basis of audit documentation 10.Complete water loss audit certification statement for EPD submittal

14 QWLA Training Program Level 1 Validation Focus AWWA Free Water Audit Software: Reporting Worksheet WAS v5.0 American Water Works Association. Copyright 2014, All Rights Reserved.? Click to access definition Water Audit Report for: Northern San Leandro Combined Water Sewer Storm Utility District ( ) + Click to add a comment WAS 5.0 Reporting Year: / /2013 American Water Works Association. Copyright 2014, All Rights Reserved. The grading assigned to each audit component and the corresponding recommended improvements and actions are highlighted in yellow. Audit accuracy is likely to be improved by prioritizing those items shown in red Please enter data in the white cells below. Where available, metered values should be used; if metered values are unavailable please estimate a value. Indicate your confidence in the accuracy of Grading >>> n/a WATER SUPPLIED the input data by grading each component (n/a or 1-10) using the drop-down list to the left of the input cell. Hover the mouse over the cell to obtain a description of the grades Volume from own sources: Improvements to attain higher data grading for "Volume from own Sources" component: Volume from own sources master meter and supply error adjustment: Improvements to attain higher data grading for "Master meter and supply error adjustment" component: Water Imported: Select this grading only if the water utility purchases/imports all of its water resources (i.e. has no sources of its own) Select n/a only if the water utility fails to have meters on its sources of supply Select n/a if the water utility's supply is exclusively from its own water resources (no bulk purchased/ imported water) Less than 25% of water production sources are metered, remaining sources are estimated. No regular meter accuracy testing or electronic calibration conducted. to qualify for 2: Organize and launch efforts to collect data for determining volume from own sources Inventory information on meters and paper records of measured volumes exist but are incomplete and/or in a very crude condition; data error cannot be determined to qualify for 2: Develop a plan to restructure recordkeeping system to capture all flow data; set a procedure to review flow data on a daily basis to detect input errors. Obtain more reliable information about existing meters by conducting field inspections of meters and related instrumentation, and obtaining manufacturer literature. Less than 25% of imported water sources are metered, remaining sources are estimated. No regular meter accuracy testing. 25% - 50% of treated water production sources are metered; other sources estimated. No regular meter accuracy testing or electronic calibration conducted. No automatic datalogging of production volumes; daily readings are scribed on paper records without any accountability controls. Flows are not balanced across the water distribution system: tank/storage elevation changes are not employed in calculating the "Volume from own sources" component and archived flow data is adjusted only when grossly evident data error occurs. 25% - 50% of imported water sources are metered; other sources estimated. No regular meter accuracy testing. AWWA Free Water Audit Software: Grading Matrix Conditions between 2 and 4 to qualify for 4: Locate all water production sources on maps and in the field, launch meter accuracy testing for existing meters, begin to install meters on unmetered water production sources and replace any obsolete/defective meters. Conditions between 2 and 4 to qualify for 4: Install automatic datalogging equipment on production meters. Complete installation of level instrumentation at all tanks/storage facilities and include tank level data in automatic calculation routine in a computerized system. Construct a computerized listing or spreadsheet to archive input volumes, tank/storage volume changes and import/export flows in order to determine the composite "Water Supplied" volume for the distribution system. Set a procedure to review this data on a monthly basis to detect gross anomalies and data gaps. Conditions between 2 and 4 50% - 75% of treated water production sources are metered, other sources estimated. Occasional meter accuracy testing or electronic calibration conducted. Production meter data is logged automatically in electronic format and reviewed at least on a monthly basis with necessary corrections implemented. "Volume from own sources" tabulations include estimate of daily changes in tanks/storage facilities. Meter data is adjusted when gross data errors occur, or occasional meter testing deems this necessary. 50% - 75% of imported water sources are metered, other sources estimated. Occasional meter accuracy testing conducted. Conditions between 4 and 6 to qualify for 6: Formalize annual meter accuracy testing for all source meters; specify the frequency of testing. Complete installation of meters on unmetered water production sources and complete replacement of all obsolete/defective meters. Conditions between 4 and 6 to qualify for 6: Refine computerized data collection and archive to include hourly production meter data that is reviewed at least on a weekly basis to detect specific data anomalies and gaps. Use daily net storage change to balance flows in calculating "Water Supplied" volume. Necessary corrections to data errors are implemented on a weekly basis. Conditions between 4 and 6 At least 75% of treated water production sources are metered, or at least 90% of the source flow is derived from metered sources. Meter accuracy testing and/or electronic calibration of related instrumentation is conducted annually. Less than 25% of tested meters are found outside of +/- 6% accuracy. Hourly production meter data logged automatically & reviewed on at least a weekly basis. Data is adjusted to correct gross error when meter/instrumentation equipment malfunction is detected; and/or error is confirmed by meter accuracy testing. Tank/storage facility elevation changes are automatically used in calculating a balanced "Volume from own sources" component, and data gaps in the archived data are corrected on at least a weekly basis. At least 75% of imported water sources are metered, meter accuracy testing and/or electronic calibration of related instrumentation is conducted annually for all meter installations. Less than 25% of tested meters are found outside of +/- 6% accuracy. Conditions between 6 and 8 to qualify for 8: Conduct annual meter accuracy testing and calibration of related instrumentation on all meter installations on a regular basis. Complete project to install new, or replace defective existing, meters so that entire production meter population is metered. Repair or replace meters outside of +/- 6% accuracy. Conditions between 6 and 8 to qualify for 8: Ensure that all flow data is collected and archived on at least an hourly basis. All data is reviewed and detected errors corrected each business day. Tank/storage levels variations are employed in calculating balanced "Water Supplied" component. Adjust production meter data for gross error and inaccuracy confirmed by testing. Conditions between 6 and 8 100% of treated water production 100% of treated water production sources are metered, meter accuracy All volumes to be entered as: MILLION GALLONS (US) PER YEAR sources are metered, meter accuracy testing and electronic calibration of testing and electronic calibration of Conditions To select between the related correct instrumentation data is conducted grading for each input, determine the highest grade where related instrumentation is conducted 8 and 10 semi-annually, with less than 10% found annually, less than 10% of meters are the outside utility of +/- 3% meets accuracy. Procedures or exceeds all criteria for that grade and all grades below it. Master Meter Error Adjustments found outside of +/- 6% accuracy are reviewed by a third party knowledgeable in the M36 methodology. WATER SUPPLIED < Enter grading in column 'E' and 'J' > Pcnt: Value: Volume from own sources: +? 5 1, MG/Yr +? 1 to maintain 10: MG/Yr to qualify for 10: Standardize meter accuracy test Maintain annual meter accuracy testing and calibration of frequency to semi-annual, or more Water imported: +? MG/Yr +? MG/Yr related instrumentation for all meter installations. Repair or frequent, for all meters. Repair or replace meters outside of +/- 3% accuracy. Investigate new replace meters outside of +/- 3% Water exported: +? MG/Yr +? 9 meter technology; pilot one or more replacements with MG/Yr accuracy. Continually investigate/pilot innovative meters in attempt to further improve meter accuracy. improving metering technology. Enter negative % or value for under-registration WATER SUPPLIED: MG/Yr Enter positive % or value for over-registration Continuous production meter data is. logged automatically & reviewed each Computerized system (SCADA or business day. Data is adjusted to similar) automatically balances flows AUTHORIZED correct gross error from detected CONSUMPTION from all sources and storages; results Click here:? meter/instrumentation equipment are reviewed each business day. Tight malfunction and/or results of meter Conditions between accountability controls ensure that all Billed metered: +? MG/Yr for help using option accuracy testing. Tank/storage facility 8 and 10 data gaps that occur in the archived flow elevation changes are automatically data are quickly detected and corrected. Billed unmetered: +? MG/Yr buttons below used in "Volume from own sources" Regular calibrations between SCADA tabulations and data gaps in the and sources meters ensures minimal Unbilled metered: +? MG/Yr Pcnt: Value: archived data are corrected on a daily data transfer error. basis. Unbilled unmetered: +? MG/Yr 1.25% MG/Yr Default option selected for Unbilled unmetered - a grading of 5 is applied but not displayed to maintain 10: Monitor meter innovations for Use buttons to select development AUTHORIZED of more accurate and less CONSUMPTION:? MG/Yr expensive flowmeters. Continue to percentage of water to qualify for 10: replace or repair meters as they perform Link all production and tank/storage facility elevation change outside of desired accuracy limits. Stay supplied data to a Supervisory Control & Data Acquisition (SCADA) abreast of new and more accurate water System, or similar computerized monitoring/control system, OR level instruments to better record and establish automatic flow balancing algorithm and regularly tank/storage levels and archive the calibrate between SCADA and source meters. Data is value variations in storage volume. Keep WATER reviewed LOSSES and corrected each (Water business day. Supplied - Authorized Consumption) MG/Yr current with SCADA and data management systems to ensure that Apparent Losses Pcnt: Value: archived data is well-managed and error free. Unauthorized consumption: +? MG/Yr 0.25% MG/Yr 100% of imported water sources are metered, meter accuracy testing and electronic calibration of related instrumentation is conducted annually, less than 10% of meters are found outside of +/- 6% accuracy Conditions between 8 and % of imported water sources are Unauthorized metered, meter accuracy consumption testing and volume entered is greater than the recommended default value electronic calibration of related instrumentation is conducted semiannually for all meter installations, with less than 10% of accuracy tests found outside of +/- 3% accuracy. Customer metering inaccuracies: +? MG/Yr 1.00% MG/Yr Systematic data handling errors: +? MG/Yr 0.25% MG/Yr Improvements to attain higher data grading for "Water Imported Volume" component: Apparent Losses:? MG/Yr (Note: usually the water supplier selling the water - "the Exporter" - to the utility being audited is responsible to maintain the metering installation measuring the imported volume. The utility should coordinate carefully with the Exporter to ensure that adequate meter upkeep takes place and an accurate measure of the Water Imported volume is quantified. ) to qualify for 2: to qualify for 6: Review bulk water purchase To qualify for 4: Formalize annual meter accuracy testing for all imported agreements with partner suppliers; Locate all imported water sources on maps and in the field, water meters, planning for both regular meter accuracy confirm requirements for use and launch meter accuracy testing for existing meters, begin to testing and calibration of the related instrumentation. maintenance of accurate metering. install meters on unmetered imported water Continue installation of meters on unmetered imported water Identify needs for new or interconnections and replace obsolete/defective meters. interconnections and replacement of obsolete/defective replacement meters with goal to meters. meter all imported water sources. to qualify for 8: Complete project to install new, or replace defective, meters on all imported water interconnections. Maintain annual meter accuracy testing for all imported water meters and conduct calibration of related instrumentation at least annually. Repair or replace meters outside of +/- 6% accuracy. to maintain 10: Standardize meter accuracy test to qualify for 10: Real Losses (Current Annual Real frequency Losses to semi-annual, or more Conduct meter accuracy testing for all meters on a semi-annual CARL) frequent, for all meters. Continue to basis, along with calibration of all related instrumentation. conduct calibration of related Repair or replace meters outside Real of +/- 3% accuracy. Losses = Water Losses - Apparent Losses: Investigate new meter technology; pilot one or more replacements with innovative meters in attempt to improve meter accuracy. instrumentation on a semi-annual basis. Repair or replace meters outside of +/- 3% accuracy. Continually investigate/pilot improving metering technology. WATER LOSSES: NON-REVENUE WATER NON-REVENUE WATER:? = Water Losses + Unbilled Metered + Unbilled Unmetered SYSTEM DATA MG/Yr MG/Yr MG/Yr Length of mains: +? miles Number of active AND inactive service connections: +? 6 1,000 Service connection density:? 10 conn./mile main? Are customer meters typically located at the curbstop or property line? Yes (length of service line, beyond the property Average length of customer service line: +? ft boundary, that is the responsibility of the utility) Average length of customer service line has been set to zero and a data grading score of 10 has been applied Average operating pressure: +? psi COST DATA Total annual cost of operating water system: +? 5 $1,000,000 $/Year Customer retail unit cost (applied to Apparent Losses): +? 7 $3.50 $/1000 gallons (US) Variable production cost (applied to Real Losses): +? 7 $3, $/Million gallons Use Customer Retail Unit Cost to value real losses WATER AUDIT DATA VALIDITY SCORE: *** YOUR SCORE IS: 60 out of 100 ***

15 QWLA Training Program Supporting Documents

16 Gremlin Hunting

17 Water exported: From Debbie Reaves (Billing). Water sold to Walter County. Step 9- Assemble Water Audit File & Water exported: master meter error From John Collins (Metering). Walter County master meter is not tested. Master meter is an 8" turbine, age unknown. Read monthly. adjustment: Validation Review Documentation From Debbie Reaves (Billing) and John Collins (Metering). 100% of cusomers are metered. Reads conducted quarterly, rate of estimation is approx 14%. Billed metered: Meter population ranges from new to >20 years old. Routine changeout of small meters at approx per year; changeout not based on test results. 10% of pulled meters are tested. QWLA: Walter P. Loss, QWLA Billed #0117. unmetered: Audit prepared From Debbie by: Reaves Frank Smith, (Billing). No flat rate accounts. Initial screening of metrics: shows metrics to be off by several orders of magnitude. Corrected volume units to MG/yr. Metrics in line with validated datasets. General Comment: Audit Item From John Collins (Metering). Only 2 metered facilities are unbilled: Smith WWTP and Weston WWTP. The volume of potable water consumed (but not Unbilled metered: billed) by these facilities in the audit year was mg. Comment From Dale Moorville (Production). Volumes from WTP FWM venturis. Data From collected Rick Miller from (Distribution). SCADA archive Fire and dept recorded usage in from production 3 VFDs spreadsheet. reported monthly, The but the largest of the 3 is deemed unreliable. Flushing volumes are tracked by Unbilled unmetered: Volume from own sources: differential pressure cells (transducers) connected to the venturi FWFM are MWU calibrated staff each on a month. semi-annual Calculation: basis. The Fire latest Dept accuracy (4.5mg) + verification Flushing (15.48mg) tests performed = mg. on the 2 FWFMs showed 6.3% over registration on #1 and 1.3% under registration on #2. Meter #1 is a 35 yr old venturi. Meter #2 is a 18 year old venturi. From Dale Moorville (Production). Calculation: Unauthorized 6.3%x71% consumption: (over) - 1.3%x29% Default (under) utilized, = 4.1% this (over). item is FWFMs not tracked logged closely. daily, reviewed monthly. Data gaps in Vol. from own sources: Master SCADA have been observed but not accounted for in this input, will correct for future. Flows across the distribution system are balanced automatically by the meter error adjustment: SCADA System with inflow/outflow of supply at MWU s five ground level water storage tanks taken into account. Water imported: n/a From John Collins (Metering). 10% of the roughly 2500 meters pulled for replacement each year are tested. Majority of these are small meters. Selection for Customer metering inaccuracies: replacement not based on testing data, but rather age or area of the system. Overall inaccuracy calculated from test results in audit year was 3.93%. Systematic data handling errors: Default utilized, this item is not tracked closely. Water imported: master meter error n/a adjustment: From Chris Johnson (Engineering). GIS system in place, solid process exists for permitting new construction and obtaining as-built records in a timely fashion. Length of mains: Follow-up field checks to confirm the as-built drawings are not conducted very often, however, and occasionally errors or omissions in the final records are Water exported: From Debbie Reaves (Billing). Water sold to Walter County. noted by field staff when they are conducting work on the system. From John Collins (Metering). MWU has a system of dated paper records for customer service connection lines installed before This data is of poor Number of active AND inactive quality and the number of In-active service lines (6,500) is very approximate. Records of lines installed after 1990 generally have more accurate data and this Water exported: master meter error service connections: From John Collins (Metering). Walter County master meter is not tested. information Master meter is also is an included 8" turbine, the age computerized unknown. Read customer monthly. billing system. The total number of customer service lines is believed to be in error by 5-10%. adjustment: Average length of customer service From Debbie Reaves (Billing) and John Collins (Metering). 100% of cusomers From are John metered. Collins Reads (Metering). conducted All customer quarterly, meters rate of are estimation installed at is approx the property 14%. line, default input of zero here. line: Billed metered: Meter population ranges from new to >20 years old. Routine changeout of small meters at approx per year; changeout not based on test results. 10% of pulled meters are tested. From Rick Miller (Distribution). Pressure data is collected only from periodic hydrant flow tests and at the water plants. The network is setup in 6 pressure Average operating pressure: zones. Average operating pressure is determined as a simple average of available readings. Billed unmetered: From Debbie Reaves (Billing). No flat rate accounts. Total annual cost of operating water From Jen Stevens (Finance). Water Budget Summary report for FY Includes depreciation and debt service, excludes non-potable operating costs. All From John Collins (Metering). Only 2 metered facilities are unbilled: system: Smith financial WWTP records and Weston are audit WWTP. by the The MWU volume staff of and potable an outside water CPA consumed firm each (but year. not Unbilled metered: billed) by these facilities in the audit year was mg. From Jen Stevens (Finance). Calculation: / = 64% ratio of sewer to water sold Customer retail unit cost (applied to $ ($5.81x64%)= $8.38/kgal From Rick Miller (Distribution). Fire dept usage from 3 Apparent VFDs reported Losses): monthly, but the largest of the 3 is deemed unreliable. Flushing volumes are tracked by Unbilled unmetered: Only residential rates utiltized in calculation, volume sold by rate codes not readily available in billing software. MWU staff each month. Calculation: Fire Dept (4.5mg) + Flushing (15.48mg) = mg. Variable production cost (applied to From Jen Stevens (Finance). Calculation: Chemicals ((1,093,145.38)+Electricity (2,263,889.57)) / MG produced = $406.89/MG. Includes chemicals Real Losses): and electricity only. Unauthorized consumption: Default utilized, this item is not tracked closely. From John Collins (Metering). 10% of the roughly 2500 meters pulled for replacement each year are tested. Majority of these are small meters. Selection for Customer metering inaccuracies: replacement not based on testing data, but rather age or area of the system. Overall inaccuracy calculated from test results in audit year was 3.93%. Systematic data handling errors: Default utilized, this item is not tracked closely.

18

19 QWLA Exam Results Pass 74% Fail 26% UTILITIES REPRESENTED THROUGH THE QWLA PROGRAM UTILITY U T I L I L I T Y C O N S U L T A N T A G E N C Y A supply of QWLAs sufficient for the annual demand for conducting AWWA water loss audit validation reviews in Georgia QWLA Training Program objective

20 Acknowledgements Jason Bodwell, GEFA Lebone Moeti, GA EPD Brian Skeens, CH2M Andrew Chastain-Howley, Black & Veatch George Kunkel, Kunkel Water Efficiency Consulting

21 Self-Sustaining Validation: The Nation s First Water Loss Audit Certification Program Presented by: Tory N. Wagoner, P.E./P.L.S. Director of Operations, Cavanaugh tory.wagoner@cavanaughsolutions.com