Fly Ash Testing Results PEI Energy Systems Waste Combustion Ash

Fly Ash Testing Results PEI Energy Systems Waste Combustion Ash Job No. 121811835 Prepared for: PEI Energy Systems (Veresen Inc.) PO Box 271 Charlottetown PE C1A 9M2 Prepared by: Stantec Consulting Ltd. 165 Maple Hills Avenue Charlottetown PE C1C 1N9 February 11, 2016

Stantec Consulting Ltd. 165 Maple Hills Avenue, Charlottetown PE C1C 1N9 February 11, 2016 File: 121811835 Attention: Mr. Chris MacDougall, P.Eng. PEI Energy Systems (Veresen Inc.) PO Box 271 Charlottetown PE C1A 9M2 Dear Mr. MacDougall, Reference: Fly Ash Testing Results - PEI Energy Systems Waste Combustion Ash The following report presents the results of municipal waste combustion ash testing completed on fly ash samples collected on January 7, 2016. The fly ash is generated at the PEI Energy Systems waste combustion plant, located in Charlottetown, PEI. The fly ash is collected on a conveyer belt and diverted into a covered storage container located inside the waste combustion plant. The covered storage container is left to collect fly ash for one week before being sealed and moved to the exterior of the plant. Samples were taken from three covered storage containers located on-site at the waste combustion plant. Sample Methodology Three discrete grab samples were taken from three separate covered storage containers located at the waste combustion plant. The three containers represented newly generated fly ash (Fly Ash- 01), ash that had been stored on-site for one week post-generation (Fly Ash-02), and ash that had been stored on-site for two weeks post-generation (Fly Ash-03). As the containers are covered, samples were collected through an access hatch using an extendable sample pole. A bottle attached to the sample pole was used to decant sample into laboratory-supplied bottles. The bottles were then capped and stored in a cooler for transport to Stantec. Selected photos are presented in Appendix A. Sample Analysis Three ash samples (Fly Ash-01, Fly Ash-02 and Fly Ash-03) were shipped in a cooler to the Maxxam Analytics Inc. (Maxxam) laboratory in Bedford, Nova Scotia, for analysis. As per guidance from the PEI Department of Communities, Land and Environment (PEIDCLE), the samples were analyzed for metals leachate, PCB leachate and dioxin/furan leachate using the Toxicity Characteristic Leaching Procedure (TCLP), and total cyanide. As a policy, Maxxam does not conduct free cyanide analysis due to health and safety concerns. Based on this and in consultation with PEIDCLE, total cyanide analysis was conducted on the samples.

February 11, 2016 Mr. Chris MacDougall, P.Eng. Page 2 Reference: Fly Ash Testing Results - PEI Energy Systems Waste Combustion Ash Results Sample results are summarized on Tables B1 to B4 in Appendix B, with copies of laboratory certificates included in Appendix C. As no leachate guidelines were specified by PEIDCLE, Environment Canada Export and Import of Hazardous Waste and Hazardous Recyclable Material Regulations-Schedule 6 (2005) were included for reference purposes. Environment Canada has not published guidelines for leachable PCBs. Leachable cadmium concentrations were found to exceed the referenced leachate guideline in all three samples. All other sample concentrations were below the referenced guidelines (where published). Closure This report documents work that was performed in accordance with generally accepted professional standards at the time and location in which the services were provided. No other representations, warranties or guarantees are made concerning the accuracy or completeness of the data or conclusions contained within this report, including no assurance that this work has uncovered all potential liabilities associated with the identified property. This report provides an evaluation of selected environmental conditions associated with the identified portion of the property that was assessed at the time the work was conducted and is based on information obtained by and/or provided to Stantec at that time. There are no assurances regarding the accuracy and completeness of this information. All information received from the client or third parties in the preparation of this report has been assumed by Stantec to be correct. Stantec assumes no responsibility for any deficiency or inaccuracy in information received from others. The opinions in this report can only be relied upon as they relate to the condition of the portion of the identified property that was assessed at the time the work was conducted. Activities at the property subsequent to Stantec s assessment may have significantly altered the property s condition. Stantec cannot comment on other areas of the property that were not assessed. Conclusions made within this report consist of Stantec s professional opinion as of the time of the writing of this report, and are based solely on the scope of work described in the report, the limited data available and the results of the work. They are not a certification of the property s environmental condition. This report should not be construed as legal advice. This report has been prepared for the exclusive use of the client identified herein and any use by any third party is prohibited. Stantec assumes no responsibility for losses, damages, liabilities or claims, howsoever arising, from third party use of this report.

February 11, 2016 Mr. Chris MacDougall, P.Eng. Page 3 Reference: Fly Ash Testing Results - PEI Energy Systems Waste Combustion Ash The locations of any utilities, buildings and structures, and property boundaries illustrated in or described within this report, if any, including pole lines, conduits, water mains, sewers and other surface or sub-surface utilities and structures are not guaranteed. Before starting work, the exact location of all such utilities and structures should be confirmed and Stantec assumes no liability for damage to them. The conclusions are based on the site conditions encountered by Stantec at the time the work was performed at the specific testing and/or sampling locations, and conditions may vary among sampling locations. Factors such as areas of potential concern identified in previous studies, site conditions (e.g., utilities) and cost may have constrained the sampling locations used in this assessment. In addition, analysis has been carried out for only a limited number of chemical parameters, and it should not be inferred that other chemical species are not present. Due to the nature of the investigation and the limited data available, Stantec does not warrant against undiscovered environmental liabilities, nor that the sampling results are indicative of the condition of the entire site. As the purpose of this report is to identify site conditions which may pose an environmental risk; the identification of non-environmental risks to structures or people on the site is beyond the scope of this assessment. Should additional information become available which differs significantly from our understanding of conditions presented in this report, Stantec requests that this information be brought to our attention. The primary author of this report was Janeen McGuigan, M.A.Sc, E.I.T. It was reviewed by Chris Balram, P.Eng. (NB). Regards, STANTEC CONSULTING LTD. Janeen McGuigan, M.A.Sc., E.I.T. Stephanie Griffin, P.Eng. Phone: 902-566-2866 Phone: 902-566-2866 Fax: 902-566-2004 Fax: 902-566-2004 janeen.mcguigan@stantec.com stephanie.griffin@stantec.com jm v:\01218\active\121811835\reports\fly ash- jan 2016\121811835_pei_energy_fly_ash_02092016_dft rpt.docx

Appendix A Site Photos

Photo 1. Collection of newly generated fly ash inside the waste combustion plant at PEI Energy Systems (January 7, 2016).

Photo 2. Covered fly ash storage container outside the waste combustion plant at PEI Energy Systems (January 7, 2016).

Photo 3. Access hatch on covered fly ash storage container (January 7, 2016).

Appendix B Laboratory Summary Tables

Table B1. Leachable Metal Concentrations (mg/l) Parameter Export and Import of Hazardous Waste and Hazardous Recyclable Material Regulations Fly Ash-01 Fly Ash-02 Fly Ash-03 7-Jan-16 7-Jan-16 7-Jan-16 Leachable Metals Leachable Aluminum (Al) -- 4.5 <1.0 1.8 Leachable Antimony (Sb) -- 1.9 1.5 0.77 Leachable Arsenic (As) 2.5 <0.20 <0.20 <0.20 Leachable Barium (Ba) 100 2.6 2.7 1.8 Leachable Beryllium (Be) -- <0.20 <0.20 <0.20 Leachable Boron (B) 500 <5.0 <5.0 <5.0 Leachable Cadmium (Cd) 0.5 28 28 28 Leachable Calcium (Ca) -- 11000 10000 10000 Leachable Chromium (Cr) 5 <0.20 <0.20 <0.20 Leachable Cobalt (Co) -- <0.10 <0.10 <0.10 Leachable Copper (Cu) -- 15 12 8.9 Leachable Iron (Fe) -- <5.0 <5.0 <5.0 Leachable Lead (Pb) 5 1.5 1.1 0.97 Leachable Lithium (Li) -- 0.30 0.33 0.25 Leachable Magnesium (Mg) -- 110 100 97 Leachable Manganese (Mn) -- 4.1 3.8 3.3 Leachable Mercury (Hg) 0.1 0.002 0.001 0.0016 Leachable Molybdenum (Mo) -- 0.24 0.24 <0.20 Leachable Nickel (Ni) -- <0.20 <0.20 <0.20 Leachable Potassium (K) -- 1100 1000 660 Leachable Selenium (Se) 1 <0.10 <0.10 <0.10 Leachable Silver (Ag) -- <0.050 <0.050 <0.050 Leachable Strontium (Sr) -- 8.9 8.7 8.7 Leachable Thallium (Tl) -- 0.013 0.011 0.012 Leachable Tin (Sn) -- <0.20 <0.20 <0.20 Leachable Uranium (U) 10 0.021 0.016 0.018 Leachable Vanadium (V) -- <0.20 <0.20 <0.20 Leachable Zinc (Zn) -- 440 400 350 BOLD = exceeding guideline

Table B2. Leachable PCB Concentrations (µg/l) Leachable PCBs Parameter Fly Ash-01 Fly Ash-01 LD Fly Ash-02 Fly Ash-03 7-Jan-16 7-Jan-16 7-Jan-16 7-Jan-16 Leachable Aroclor 1016 <0.50 <0.50 <0.50 <0.50 Leachable Aroclor 1221 <0.50 <0.50 <0.50 <0.50 Leachable Aroclor 1232 <0.50 <0.50 <0.50 <0.50 Leachable Aroclor 1248 <0.50 <0.50 <0.50 <0.50 Leachable Aroclor 1242 <0.50 <0.50 <0.50 <0.50 Leachable Aroclor 1254 <0.50 <0.50 <0.50 <0.50 Leachable Aroclor 1260 <0.50 <0.50 <0.50 <0.50 Leachable Calculated Total PCB <0.50 <0.50 <0.50

Table B3. Cyanide Concentrations in Ash (mg/kg) Parameter Fly Ash-01 Fly Ash-02 Fly Ash-03 7-Jan-16 7-Jan-16 7-Jan-16 Cyanide in Ash Total Cyanide (CN) <0.5 <0.5 <0.5

Table B4. Leachable Dioxin and Furan Concentrations (pg/l) Parameter Export and Import of Hazardous Waste and Hazardous Recyclable Material Regulations Fly Ash-01 Fly Ash-02 Fly Ash-03 7-Jan-16 7-Jan-16 7-Jan-16 Leachable Dioxins and Furans Leachable 2,3,7,8-Tetra CDD * -- <0.774 <0.891 <0.609 Leachable 1,2,3,7,8-Penta CDD * -- <0.523 <0.797 <0.671 Leachable 1,2,3,4,7,8-Hexa CDD * -- <0.928 <0.935 <0.747 Leachable 1,2,3,6,7,8-Hexa CDD * -- <0.988 <0.996 <0.796 Leachable 1,2,3,7,8,9-Hexa CDD * -- <0.869 <0.875 <0.699 Leachable 1,2,3,4,6,7,8-Hepta CDD * -- <0.810 <0.843 <0.891 Leachable Octa CDD * -- 3.05 1.88 1.71 Leachable Total Tetra CDD * -- <1.05 <0.891 <0.866 Leachable Total Penta CDD * -- <0.843 <0.797 <0.671 Leachable Total Hexa CDD * -- <5.33 <2.52 <1.95 Leachable Total Hepta CDD * -- <0.810 <0.843 <0.891 Leachable 2,3,7,8-Tetra CDF ** -- <0.636 <0.718 <0.976 Leachable 1,2,3,7,8-Penta CDF ** -- <0.956 <0.818 <1.00 Leachable 2,3,4,7,8-Penta CDF ** -- <0.961 <0.823 <1.01 Leachable 1,2,3,4,7,8-Hexa CDF ** -- <0.947 <0.675 <0.514 Leachable 1,2,3,6,7,8-Hexa CDF ** -- <0.902 <0.643 <0.490 Leachable 2,3,4,6,7,8-Hexa CDF ** -- <0.957 <0.683 <0.520 Leachable 1,2,3,7,8,9-Hexa CDF ** -- <1.04 <0.743 <0.566 Leachable 1,2,3,4,6,7,8-Hepta CDF ** -- <0.817 <1.00 <0.590 Leachable 1,2,3,4,7,8,9-Hepta CDF ** -- <0.993 <1.22 <0.717 Leachable Octa CDF ** -- <1.06 <1.04 <0.964 Leachable Total Tetra CDF ** -- <0.636 <0.855 <0.976 Leachable Total Penta CDF ** -- <0.959 <0.820 <1.01 Leachable Total Hexa CDF ** -- <0.959 <0.684 <0.521 Leachable Total Hepta CDF ** -- <0.896 <1.10 <0.648 Total Toxic Equivalency (TEQ) 1500 2.37 2.62 2.17 * CDD = Chloro Dibenzo-p-Dioxin ** CDF = Chloro Dibenzo-p-Furan

Appendix C Laboratory Certificates