November 16, 2015 Charlotte Water and PCBs The Saga Continues Jon Lapsley, P.E. CDM Smith Maggie Macomber, P.E. Charlotte Water 2015 Annual Conference Raleigh, NC

Agenda  Where we were  Plant operations – the new normal  Sampling program evolution  Revisiting data  Decontamination status  Biosolids program  Next steps and general update 2

Where we were… 3

4  Disposed of 300 truck loads of contaminated Biosolids  Non-detect on all influent and effluent samples since February 2014  Decontaminated stormwater outfall  Preparing decontamination plans  Planning for RFP for decontamination  Maintaining plant operations

Plant operations – the new normal  Regular maintenance requires planning  Operations have changed (temporarily)  Record keeping and the future – what isn’t decontaminated 5

Sampling program evolution and data  Initial emergency  Investigation phase  Current sampling plan  Ultimate goal 6

Revisiting data 7

8

Decontamination status 9  Initial RFP advertised May 2015  Qualifications and price proposal  Revised RFP – Opened in late October  Step 1: Qualifications review  Step 2: Short list pricing and interviews

Decontamination status 10

Decontamination status  Pricing arrangement and considerations  Lump sum by process unit  Disposal unit prices (by contamination level and solid/liquid)  Daily dewatering production  General contractor assistance line items  Re-seeding anaerobic digesters for startup 11

Biosolids program update  Typical biosolids program disrupted  Community relations  Biosolids land application permit renewal 12

Lab testing methods 13 EPA Method Category Method 8082 (Aroclor Method) Method 680 (Homolog Method - Low Resolution) Method 1668 (Congener Method - High Resolution) Ability to Identify Total PCB ConcentrationsYes Potential for False Positive ResultsLeastHighestModerate Method Detection Limits 0.1 to 0.5 parts per billion 0.3 to 0.8 parts per trillion Availability of North Carolina Certified LaboratoriesAvailableNone identified Cost of Individual TestsLeastModerateHighest Comparison of EPA Analytical Methods for PCBs

Next steps….Staying the course  Decontamination work – commence in early 2016  Continue sampling protocols until complete  McAlpine Creek WWMF decontamination 14

Update on FAQs  Still no arrests made  Grease traps  Trucked waste disposal  Regular contact with EPA  Costs  To date CLT Water has spent an extra ~$6M  Estimated Mallard Creek WRF Decontamination = ~$8M  McAlpine Creek is TBD  Spreading the message 15

Questions and Discussion 16 Maggie Macomber Charlotte Water Jon Lapsley CDM Smith