Independent Environmental Monitoring Program: Deloro closed mine site

The Ontario Ministry of the Environment, Conservation and Parks (MECP) is licensed by the Canadian Nuclear Safety Commission (CNSC) to conduct remediation activities associated with the Young’s Creek Area (YCA) located at the Deloro closed mine site (Deloro site). The Deloro site is an abandoned mine and industrial area located approximately 65 km east of Peterborough, Ontario, adjacent to the former village of Deloro along the banks of the Moira River. The Moira River runs through the Deloro site and flows into Lake Ontario.

The Deloro site began operation as an underground gold mine in the 1860s, and the historical mining, refining, and manufacturing operation closed in 1961. The mining and industrial operations resulted in large volumes of by-products that were deposited on the Deloro site as waste. This waste legacy includes soil, sediment, groundwater and surface water that are contaminated with arsenic, cobalt, copper, nickel and small quantities of low-level radioactive waste. Arsenic is the main contaminant of concern at the Deloro site. Low-level radioactive waste materials containing uranium and its decay products, from historic refining operations in Port Hope, constitute up to 6% of the waste, and coexist with the non-radioactive hazardous wastes. Due to this legacy waste and the ongoing remediation work, public access to the site is prohibited.

The MECP assumed responsibility for the site and the required environmental cleanup when the previous owners abandoned the site. Since 1985, the site has been under the care and control of the MECP, which has implemented measures to control the site’s environmental contamination. These measures include a comprehensive environmental protection program and an ongoing environmental monitoring program. The MECP’s overall cleanup objective for the Deloro site is to achieve a 90% reduction in arsenic discharge to the Moira River, from historical levels, and to ensure appropriate long-term management of the small quantities of low-level radioactive waste.  To meet this cleanup objective, the MECP constructed an arsenic water treatment plant to collect and treat arsenic-contaminated groundwater from the mine site. The arsenic-contaminated water is pumped to the arsenic treatment plant where the arsenic is removed and the treated effluent water is released to the Moira River, under MECP approval. The MECP also constructed two large engineered covers to isolate contaminated materials and an engineered containment cell to securely contain contaminated sediment and waste from the YCA.

The Independent Environmental Monitoring Program (IEMP) results for 2016 and 2018 are consistent with the results from the MECP and indicate that, because of the measures being taken by the MECP, the health and safety of the people and the environment are protected.

Legend

[ ] Guideline/Reference Level

 

Deloro

Sample Type Sample Description Parameter 2018 Result 2016 Result Guideline/
Reference Level
Expected Health Impact (Yes/No) Sample Code
Water Surface Water Uranium 0.22 µg/L 0.16 µg/L 15 µg/L No DM01-W01
Water Surface Water pH 7.9 7.87 6.5-9.0 No DM01-W01
Water Surface Water Gross Alpha <0.08 Bq/L <0.1 Bq/L 0.5 Bq/L No DM01-W01
Water Surface Water Gross Beta N/A <0.12 Bq/L 0.5 Bq/L No DM01-W01
Water Surface Water Gross Beta <0.09 Bq/L N/A 1 Bq/L No DM01-W01
Water Surface Water Copper 1.28 µg/L 1.24 µg/L 2 - 4 µg/L No DM01-W01
Water Surface Water Lead 0.17 µg/L <0.10 µg/L 1 - 7 µg/L No DM01-W01
Water Surface Water Nickel 1.29 µg/L 0.79 µg/L 25 - 150 µg/L No DM01-W01
Water Surface Water Zinc 5.14 µg/L 0.57 µg/L 30 µg/L No DM01-W01
Water Surface Water Arsenic 1.60 µg/L 2.56 µg/L 5 µg/L No DM01-W01
Water Surface Water Total Dissolved Solids N/A 201 mg/L 500 mg/L No DM01-W01
Water Surface Water Radium-226 <0.030 Bq/L <0.010 Bq/L 0.5 Bq/L No DM01-W01
Water Surface Water Selenium 0.13 µg/L 0.06 µg/L 1 µg/L No DM01-W01
Water Surface Water Molybdenum 0.18 µg/L 0.39 µg/L 73 µg/L No DM01-W01
Water Surface Water Inorganic Carbon N/A 23.5 mg/L N/A No DM01-W01
Water Surface Water Total Organic Carbon N/A 22.68 mg/L N/A No DM01-W01
Water Surface Water Total Carbon N/A 46.18 mg/L N/A No DM01-W01
Water Surface Water Total Suspended Solids <2.5 mg/L 3.8 mg/L N/A No DM01-W01
Water Surface Water Cobalt 0.44 µg/L 0.20 µg/L N/A No DM01-W01
Sediment 0-5 cm Uranium N/A 1.5 mg/kg dry weight 104 - 5874 mg/kg dry weight No DM02-S02
Sediment 0-5 cm Uranium 1.57 mg/kg dry weight N/A 23 mg/kg dry weight No DM02-S02
Sediment 0-5 cm Copper 67.8 mg/kg dry weight 48 mg/kg dry weight 16 - 110 mg/kg dry weight No DM02-S02
Sediment 0-5 cm Lead 24.4 mg/kg dry weight 27 mg/kg dry weight 35 - 91.3 mg/kg dry weight No DM02-S02
Sediment 0-5 cm Nickel 226 mg/kg dry weight 217 mg/kg dry weight 16 - 75 mg/kg dry weight No DM02-S02
Sediment 0-5 cm Zinc 123 mg/kg dry weight 112 mg/kg dry weight 123 - 315 mg/kg dry weight No DM02-S02
Sediment 0-5 cm Arsenic 354 mg/kg dry weight 427 mg/kg dry weight 5.9 - 17 mg/kg dry weight No DM02-S02
Sediment 0-5 cm Radium-226 27.8 Bq/kg dry weight 28 Bq/kg dry weight 4852 Bq/kg dry weight No DM02-S02
Sediment 0-5 cm Selenium 0.83 mg/kg dry weight 0.42 mg/kg dry weight 1.9 - 16.1 mg/kg dry weight No DM02-S02
Sediment 0-5 cm Molybdenum 1.06 mg/kg dry weight 0.93 mg/kg dry weight 13.8 - 1238 mg/kg dry weight No DM02-S02
Sediment 0-5 cm Inorganic Carbon N/A 2170 mg/L N/A No DM02-S02
Sediment 0-5 cm Total Organic Carbon N/A 25030 mg/L N/A No DM02-S02
Sediment 0-5 cm Total Carbon N/A 27200 mg/L N/A No DM02-S02
Sediment 0-5 cm Cobalt 187 mg/kg dry weight 165 mg/kg dry weight N/A No DM02-S02
Water Surface Water Uranium 0.32 µg/L 0.29 µg/L 15 µg/L No DM02-W02
Water Surface Water pH 8.0 7.89 6.5-9.0 No DM02-W02
Water Surface Water Gross Alpha 0.086 Bq/L <0.1 Bq/L 0.5 Bq/L No DM02-W02
Water Surface Water Gross Beta N/A <0.12 Bq/L 0.5 Bq/L No DM02-W02
Water Surface Water Gross Beta 0.105 Bq/L N/A 1 Bq/L No DM02-W02
Water Surface Water Copper 0.86 µg/L 1.41 µg/L 2 - 4 µg/L No DM02-W02
Water Surface Water Lead 0.07 µg/L <0.10 µg/L 1 - 7 µg/L No DM02-W02
Water Surface Water Nickel 2.31 µg/L 2.78 µg/L 25 - 150 µg/L No DM02-W02
Water Surface Water Zinc 0.38 µg/L <0.50 µg/L 30 µg/L No DM02-W02
Water Surface Water Arsenic 14.9 µg/L 95.1 µg/L 5 µg/L No DM02-W02
Water Surface Water Total Dissolved Solids N/A 180 mg/L 500 mg/L No DM02-W02
Water Surface Water Radium-226 <0.030 Bq/L <0.010 Bq/L 0.5 Bq/L No DM02-W02
Water Surface Water Selenium 0.13 µg/L 0.05 µg/L 1 µg/L No DM02-W02
Water Surface Water Molybdenum 0.25 µg/L 0.53 µg/L 73 µg/L No DM02-W02
Water Surface Water Inorganic Carbon N/A 20.03 mg/L N/A No DM02-W02
Water Surface Water Total Organic Carbon N/A 18.74 mg/L N/A No DM02-W02
Water Surface Water Total Carbon N/A 38.77 mg/L N/A No DM02-W02
Water Surface Water Total Suspended Solids <2.5 mg/L 6.8 mg/L N/A No DM02-W02
Water Surface Water Cobalt 1.24 µg/L 0.95 µg/L N/A No DM02-W02
Sediment 0-5 cm Uranium N/A 1.4 mg/kg dry weight 104 - 5874 mg/kg dry weight No DM03-S03
Sediment 0-5 cm Copper N/A 65 mg/kg dry weight 16 - 110 mg/kg dry weight No DM03-S03
Sediment 0-5 cm Lead N/A 31 mg/kg dry weight 35 - 91.3 mg/kg dry weight No DM03-S03
Sediment 0-5 cm Nickel N/A 554 mg/kg dry weight 16 - 75 mg/kg dry weight No DM03-S03
Sediment 0-5 cm Zinc N/A 118 mg/kg dry weight 123 - 315 mg/kg dry weight No DM03-S03
Sediment 0-5 cm Arsenic N/A 1131 mg/kg dry weight 5.9 - 17 mg/kg dry weight No DM03-S03
Sediment 0-5 cm Radium-226 N/A 27 Bq/kg dry weight 4852 Bq/kg dry weight No DM03-S03
Sediment 0-5 cm Selenium N/A 0.48 mg/kg dry weight 1.9 - 16.1 mg/kg dry weight No DM03-S03
Sediment 0-5 cm Molybdenum N/A 0.64 mg/kg dry weight 13.8 - 1238 mg/kg dry weight No DM03-S03
Sediment 0-5 cm Inorganic Carbon N/A 62 mg/L N/A No DM03-S03
Sediment 0-5 cm Total Organic Carbon N/A 17781 mg/L N/A No DM03-S03
Sediment 0-5 cm Total Carbon N/A 17843 mg/L N/A No DM03-S03
Sediment 0-5 cm Cobalt N/A 337 mg/kg dry weight N/A No DM03-S03
Water Surface Water Uranium 0.20 µg/L 1.97 µg/L 15 µg/L No DM03-W03
Water Surface Water pH 8.10 8.10 6.5-9.0 No DM03-W03
Water Surface Water Gross Alpha 0.092 Bq/L <0.1 Bq/L 0.5 Bq/L No DM03-W03
Water Surface Water Gross Beta N/A <0.12 Bq/L 0.5 Bq/L No DM03-W03
Water Surface Water Gross Beta 0.099 Bq/L N/A 1 Bq/L No DM03-W03
Water Surface Water Copper 0.86 µg/L 2.25 µg/L 2 - 4 µg/L No DM03-W03
Water Surface Water Lead 0.10 µg/L 0.13 µg/L 1 - 7 µg/L No DM03-W03
Water Surface Water Nickel 1.62 µg/L 2.79 µg/L 25 - 150 µg/L No DM03-W03
Water Surface Water Zinc 1.72 µg/L <0.50 µg/L 30 µg/L No DM03-W03
Water Surface Water Arsenic 14.7 µg/L 90.6 µg/L 5 µg/L No DM03-W03
Water Surface Water Total Dissolved Solids N/A 179 mg/L 500 mg/L No DM03-W03
Water Surface Water Radium-226 <0.030 Bq/L <0.010 Bq/L 0.5 Bq/L No DM03-W03
Water Surface Water Selenium 0.13 µg/L 0.07 µg/L 1 µg/L No DM03-W03
Water Surface Water Molybdenum 0.22 µg/L 0.38 µg/L 73 µg/L No DM03-W03
Water Surface Water Inorganic Carbon N/A 20.90 mg/L N/A No DM03-W03
Water Surface Water Total Organic Carbon N/A 19.33 mg/L N/A No DM03-W03
Water Surface Water Total Carbon N/A 40.23 mg/L N/A No DM03-W03
Water Surface Water Total Suspended Solids <2.5 mg/L 2.2 mg/L N/A No DM03-W03
Water Surface Water Cobalt 1.08 µg/L 1.21 µg/L N/A No DM03-W03
Sediment 0-5 cm Uranium N/A 11 mg/kg dry weight 104 - 5874 mg/kg dry weight No DM04-S04
Sediment 0-5 cm Uranium 22.3 mg/kg dry weight N/A 23 mg/kg dry weight No DM04-S04
Sediment 0-5 cm Copper 1975 mg/kg dry weight 1069 mg/kg dry weight 16 - 110 mg/kg dry weight No DM04-S04
Sediment 0-5 cm Lead 53.4 mg/kg dry weight 36 mg/kg dry weight 35 - 91.3 mg/kg dry weight No DM04-S04
Sediment 0-5 cm Nickel 621 mg/kg dry weight 389 mg/kg dry weight 16 - 75 mg/kg dry weight No DM04-S04
Sediment 0-5 cm Zinc 161 mg/kg dry weight 144 mg/kg dry weight 123 - 315 mg/kg dry weight No DM04-S04
Sediment 0-5 cm Arsenic 1278 mg/kg dry weight 1304 mg/kg dry weight 5.9 - 17 mg/kg dry weight No DM04-S04
Sediment 0-5 cm Radium-226 655.0 Bq/kg dry weight 285 Bq/kg dry weight 4852 Bq/kg dry weight No DM04-S04
Sediment 0-5 cm Selenium 2.77 mg/kg dry weight 0.99 mg/kg dry weight 1.9 - 16.1 mg/kg dry weight No DM04-S04
Sediment 0-5 cm Molybdenum 4.10 mg/kg dry weight 2.4 mg/kg dry weight 13.8 - 1238 mg/kg dry weight No DM04-S04
Sediment 0-5 cm Inorganic Carbon N/A 4813 mg/L N/A No DM04-S04
Sediment 0-5 cm Total Organic Carbon N/A 51596 mg/L N/A No DM04-S04
Sediment 0-5 cm Total Carbon N/A 56409 mg/L N/A No DM04-S04
Sediment 0-5 cm Cobalt 904 mg/kg dry weight 732 mg/kg dry weight N/A No DM04-S04
Water Surface Water Uranium 1.43 µg/L 1.66 µg/L 15 µg/L No DM04-W04
Water Surface Water pH 7.5 7.44 6.5-9.0 No DM04-W04
Water Surface Water Gross Alpha <0.077 Bq/L <0.1 Bq/L 0.5 Bq/L No DM04-W04
Water Surface Water Gross Beta N/A <0.12 Bq/L 0.5 Bq/L No DM04-W04
Water Surface Water Gross Beta <0.090 Bq/L N/A 1 Bq/L No DM04-W04
Water Surface Water Copper 6.02 µg/L 12.4 µg/L 2 - 4 µg/L No DM04-W04
Water Surface Water Lead 0.06 µg/L <0.10 µg/L 1 - 7 µg/L No DM04-W04
Water Surface Water Nickel 13.0 µg/L 16.2 µg/L 25 - 150 µg/L No DM04-W04
Water Surface Water Zinc 1.26 µg/L <0.50 µg/L 30 µg/L No DM04-W04
Water Surface Water Arsenic 533 µg/L 552 µg/L 5 µg/L No DM04-W04
Water Surface Water Total Dissolved Solids N/A 254 mg/L 500 mg/L No DM04-W04
Water Surface Water Radium-226 <0.030 Bq/L <0.010 Bq/L 0.5 Bq/L No DM04-W04
Water Surface Water Selenium 0.17 µg/L 0.14 µg/L 1 µg/L No DM04-W04
Water Surface Water Molybdenum 6.36 µg/L 10.1 µg/L 73 µg/L No DM04-W04
Water Surface Water Inorganic Carbon N/A 12.35 mg/L N/A No DM04-W04
Water Surface Water Total Organic Carbon N/A 16.21 mg/L N/A No DM04-W04
Water Surface Water Total Carbon N/A 28.56 mg/L N/A No DM04-W04
Water Surface Water Total Suspended Solids <2.5 mg/L 8.4 mg/L N/A No DM04-W04
Water Surface Water Cobalt 4.83 µg/L 3.00 µg/L N/A No DM04-W04
Sediment 0-5 cm Uranium N/A 6.9 mg/kg dry weight 104 - 5874 mg/kg dry weight No DM05-S05
Sediment 0-5 cm Uranium 11.2 mg/kg dry weight N/A 23 mg/kg dry weight No DM05-S05
Sediment 0-5 cm Copper 716 mg/kg dry weight 463 mg/kg dry weight 16 - 110 mg/kg dry weight No DM05-S05
Sediment 0-5 cm Lead 32.9 mg/kg dry weight 25 mg/kg dry weight 35 - 91.3 mg/kg dry weight No DM05-S05
Sediment 0-5 cm Nickel 363 mg/kg dry weight 292 mg/kg dry weight 16 - 75 mg/kg dry weight No DM05-S05
Sediment 0-5 cm Zinc 192 mg/kg dry weight 158 mg/kg dry weight 123 - 315 mg/kg dry weight No DM05-S05
Sediment 0-5 cm Arsenic 1057 mg/kg dry weight 747 mg/kg dry weight 5.9 - 17 mg/kg dry weight No DM05-S05
Sediment 0-5 cm Radium-226 259.0 Bq/kg dry weight 141 Bq/kg dry weight 4852 Bq/kg dry weight No DM05-S05
Sediment 0-5 cm Selenium 2.46 mg/kg dry weight 0.78 mg/kg dry weight 1.9 - 16.1 mg/kg dry weight No DM05-S05
Sediment 0-5 cm Molybdenum 4.30 mg/kg dry weight 2.0 mg/kg dry weight 13.8 - 1238 mg/kg dry weight No DM05-S05
Sediment 0-5 cm Inorganic Carbon N/A 20 mg/L N/A No DM05-S05
Sediment 0-5 cm Total Organic Carbon N/A 67343 mg/L N/A No DM05-S05
Sediment 0-5 cm Total Carbon N/A 67363 mg/L N/A No DM05-S05
Sediment 0-5 cm Cobalt 926 mg/kg dry weight 727 mg/kg dry weight N/A No DM05-S05
Water Surface Water Uranium 0.73 µg/L 0.25 µg/L 15 µg/L No DM05-W05
Water Surface Water pH 7.6 7.15 6.5-9.0 No DM05-W05
Water Surface Water Gross Alpha <0.077 Bq/L <0.1 Bq/L 0.5 Bq/L No DM05-W05
Water Surface Water Gross Beta N/A <0.12 Bq/L 0.5 Bq/L No DM05-W05
Water Surface Water Gross Beta <0.090 Bq/L N/A 1 Bq/L No DM05-W05
Water Surface Water Copper 4.87 µg/L 5.42 µg/L 2 - 4 µg/L No DM05-W05
Water Surface Water Lead 0.22 µg/L 0.10 µg/L 1 - 7 µg/L No DM05-W05
Water Surface Water Nickel 21.3 µg/L 15.6 µg/L 25 - 150 µg/L No DM05-W05
Water Surface Water Zinc 3.76 µg/L <0.50 µg/L 30 µg/L No DM05-W05
Water Surface Water Arsenic 187 µg/L 151 µg/L 5 µg/L No DM05-W05
Water Surface Water Total Dissolved Solids N/A 147 mg/L 500 mg/L No DM05-W05
Water Surface Water Radium-226 <0.030 Bq/L <0.010 Bq/L 0.5 Bq/L No DM05-W05
Water Surface Water Selenium 0.13 µg/L 0.08 µg/L 1 µg/L No DM05-W05
Water Surface Water Molybdenum 2.86 µg/L 2.55 µg/L 73 µg/L No DM05-W05
Water Surface Water Inorganic Carbon N/A 12.73 mg/L N/A No DM05-W05
Water Surface Water Total Organic Carbon N/A 16.34 mg/L N/A No DM05-W05
Water Surface Water Total Carbon N/A 29.07 mg/L N/A No DM05-W05
Water Surface Water Total Suspended Solids 3.3 mg/L 3.1 mg/L N/A No DM05-W05
Water Surface Water Cobalt 11.8 µg/L 7.63 µg/L N/A No DM05-W05
Sediment 0-5 cm Uranium N/A 4.0 mg/kg dry weight 104 - 5874 mg/kg dry weight No DM06-S06
Sediment 0-5 cm Uranium 10.7 mg/kg N/A 23 mg/kg dry weight No DM06-S06
Sediment 0-5 cm Copper 662 mg/kg 259 mg/kg dry weight 16 - 110 mg/kg dry weight No DM06-S06
Sediment 0-5 cm Lead 27.1 mg/kg 24 mg/kg dry weight 35 - 91.3 mg/kg dry weight No DM06-S06
Sediment 0-5 cm Nickel 364 mg/kg 346 mg/kg dry weight 16 - 75 mg/kg dry weight No DM06-S06
Sediment 0-5 cm Zinc 175 mg/kg 147 mg/kg dry weight 123 - 315 mg/kg dry weight No DM06-S06
Sediment 0-5 cm Arsenic 943 mg/kg 601 mg/kg dry weight 5.9 - 17 mg/kg dry weight No DM06-S06
Sediment 0-5 cm Radium-226 209.0 Bq/kg dry weight 99 Bq/kg dry weight 4852 Bq/kg dry weight No DM06-S06
Sediment 0-5 cm Selenium 2.09 mg/kg 0.57 mg/kg dry weight 1.9 - 16.1 mg/kg dry weight No DM06-S06
Sediment 0-5 cm Molybdenum 2.56 mg/kg 1.1 mg/kg dry weight 13.8 - 1238 mg/kg dry weight No DM06-S06
Sediment 0-5 cm Inorganic Carbon N/A 22 mg/L N/A No DM06-S06
Sediment 0-5 cm Total Organic Carbon N/A 54051 mg/L N/A No DM06-S06
Sediment 0-5 cm Total Carbon N/A 54073 mg/L N/A No DM06-S06
Sediment 0-5 cm Cobalt 1040 mg/kg dry weight 766 mg/kg dry weight N/A No DM06-S06
Water Surface Water Uranium 0.34 µg/L 0.18 µg/L 15 µg/L No DM06-W06
Water Surface Water pH 7.6 7.59 6.5-9.0 No DM06-W06
Water Surface Water Gross Alpha <0.077 Bq/L <0.1 Bq/L 0.5 Bq/L No DM06-W06
Water Surface Water Gross Beta N/A <0.12 Bq/L 0.5 Bq/L No DM06-W06
Water Surface Water Gross Beta <0.090 Bq/L N/A 1 Bq/L No DM06-W06
Water Surface Water Copper 5.59 µg/L 3.87 µg/L 2 - 4 µg/L No DM06-W06
Water Surface Water Lead 0.13 µg/L <0.10 µg/L 1 - 7 µg/L No DM06-W06
Water Surface Water Nickel 16.4 µg/L 7.34 µg/L 25 - 150 µg/L No DM06-W06
Water Surface Water Zinc 1.65 µg/L <0.50 µg/L 30 µg/L No DM06-W06
Water Surface Water Arsenic 189 µg/L 110 µg/L 5 µg/L No DM06-W06
Water Surface Water Total Dissolved Solids N/A 169 mg/L 500 mg/L No DM06-W06
Water Surface Water Radium-226 <0.030 Bq/L <0.010 Bq/L 0.5 Bq/L No DM06-W06
Water Surface Water Selenium 0.13 µg/L 0.07 µg/L 1 µg/L No DM06-W06
Water Surface Water Molybdenum 2.89 µg/L 1.08 µg/L 73 µg/L No DM06-W06
Water Surface Water Inorganic Carbon N/A 17.87 mg/L N/A No DM06-W06
Water Surface Water Total Organic Carbon N/A 17.29 mg/L N/A No DM06-W06
Water Surface Water Total Carbon N/A 35.16 mg/L N/A No DM06-W06
Water Surface Water Total Suspended Solids 3.9 mg/L 1.2 mg/L N/A No DM06-W06
Water Surface Water Cobalt 5.53 µg/L 0.82 µg/L N/A No DM06-W06
Sediment 0-5 cm Uranium N/A 1.5 mg/kg dry weight 104 - 5874 mg/kg dry weight No DM07-S07
Sediment 0-5 cm Uranium 1.52 mg/kg N/A 23 mg/kg dry weight No DM07-S07
Sediment 0-5 cm Copper 57.6 mg/kg 58 mg/kg dry weight 16 - 110 mg/kg dry weight No DM07-S07
Sediment 0-5 cm Lead 29.0 mg/kg 0.58 mg/kg dry weight 35 - 91.3 mg/kg dry weight No DM07-S07
Sediment 0-5 cm Nickel 316 mg/kg 309 mg/kg dry weight 16 - 75 mg/kg dry weight No DM07-S07
Sediment 0-5 cm Zinc 170 mg/kg 174 mg/kg dry weight 123 - 315 mg/kg dry weight No DM07-S07
Sediment 0-5 cm Arsenic 563 mg/kg 748 mg/kg dry weight 5.9 - 17 mg/kg dry weight No DM07-S07
Sediment 0-5 cm Radium-226 59.7 Bq/kg dry weight 62 Bq/kg dry weight 4852 Bq/kg dry weight No DM07-S07
Sediment 0-5 cm Selenium 1.43 mg/kg 0.96 mg/kg dry weight 1.9 - 16.1 mg/kg dry weight No DM07-S07
Sediment 0-5 cm Molybdenum 0.86 mg/kg 0.58 mg/kg dry weight 13.8 - 1238 mg/kg dry weight No DM07-S07
Sediment 0-5 cm Inorganic Carbon N/A 114 mg/L N/A No DM07-S07
Sediment 0-5 cm Total Organic Carbon N/A 137403 mg/L N/A No DM07-S07
Sediment 0-5 cm Total Carbon N/A 137517 mg/L N/A No DM07-S07
Sediment 0-5 cm Cobalt 449 mg/kg 539 mg/kg dry weight N/A No DM07-S07
Water Surface Water Uranium 0.17 µg/L <0.10 µg/L 15 µg/L No DM07-W07
Water Surface Water pH 8.2 8.14 6.5-9.0 No DM07-W07
Water Surface Water Gross Alpha <0.077 Bq/L <0.1 Bq/L 0.5 Bq/L No DM07-W07
Water Surface Water Gross Beta N/A <0.12 Bq/L 0.5 Bq/L No DM07-W07
Water Surface Water Gross Beta <0.090 Bq/L N/A 1 Bq/L No DM07-W07
Water Surface Water Copper 0.95 µg/L 2.08 µg/L 2 - 4 µg/L No DM07-W07
Water Surface Water Lead 0.04 µg/L 0.18 µg/L 1 - 7 µg/L No DM07-W07
Water Surface Water Nickel 3.16 µg/L 5.59 µg/L 25 - 150 µg/L No DM07-W07
Water Surface Water Zinc 0.71 µg/L <0.50 µg/L 30 µg/L No DM07-W07
Water Surface Water Arsenic 26.0 µg/L 85.3 µg/L 5 µg/L No DM07-W07
Water Surface Water Total Dissolved Solids N/A 186 mg/L 500 mg/L No DM07-W07
Water Surface Water Radium-226 <0.030 Bq/L <0.010 Bq/L 0.5 Bq/L No DM07-W07
Water Surface Water Selenium 0.13 µg/L 0.08 µg/L 1 µg/L No DM07-W07
Water Surface Water Molybdenum 0.23 µg/L 0.45 µg/L 73 µg/L No DM07-W07
Water Surface Water Inorganic Carbon N/A 21.23 mg/L N/A No DM07-W07
Water Surface Water Total Organic Carbon N/A 19.72 mg/L N/A No DM07-W07
Water Surface Water Total Carbon N/A 40.95 mg/L N/A No DM07-W07
Water Surface Water Total Suspended Solids <2.5 mg/L 2.6 mg/L N/A No DM07-W07
Water Surface Water Cobalt 0.86 µg/L 0.83 µg/L N/A No DM07-W07
Sediment 0-5 cm Uranium 1.52 mg/kg N/A 23 mg/kg dry weight No DM08-S08
Sediment 0-5 cm Copper 110 mg/kg N/A 16 - 110 mg/kg dry weight No DM08-S08
Sediment 0-5 cm Lead 50.8 mg/kg N/A 35 - 91.3 mg/kg dry weight No DM08-S08
Sediment 0-5 cm Nickel 614 mg/kg N/A 16 - 75 mg/kg dry weight No DM08-S08
Sediment 0-5 cm Zinc 174 mg/kg N/A 123 - 315 mg/kg dry weight No DM08-S08
Sediment 0-5 cm Arsenic 100 mg/kg N/A 5.9 - 17 mg/kg dry weight No DM08-S08
Sediment 0-5 cm Radium-226 34.0 Bq/kg dry weight N/A 4852 Bq/kg dry weight No DM08-S08
Sediment 0-5 cm Selenium 1.72 mg/kg N/A 1.9 - 16.1 mg/kg dry weight No DM08-S08
Sediment 0-5 cm Molybdenum 1.07 mg/kg N/A 13.8 - 1238 mg/kg dry weight No DM08-S08
Sediment 0-5 cm Cobalt 379 mg/kg N/A N/A No DM08-S08
Water Surface Water Uranium 0.19 µg/L <0.10 µg/L 15 µg/L No DM08-W08
Water Surface Water pH 8.2 7.82 6.5-9.0 No DM08-W08
Water Surface Water Gross Alpha <0.077 Bq/L <0.1 Bq/L 0.5 Bq/L No DM08-W08
Water Surface Water Gross Beta N/A <0.12 Bq/L 0.5 Bq/L No DM08-W08
Water Surface Water Gross Beta <0.090 Bq/L N/A 1 Bq/L No DM08-W08
Water Surface Water Copper 0.94 µg/L 2.19 µg/L 2 - 4 µg/L No DM08-W08
Water Surface Water Lead 0.04 µg/L <0.10 µg/L 1 - 7 µg/L No DM08-W08
Water Surface Water Nickel 3.39 µg/L 4.38 µg/L 25 - 150 µg/L No DM08-W08
Water Surface Water Zinc 0.12 µg/L <0.50 µg/L 30 µg/L No DM08-W08
Water Surface Water Arsenic 24.7 µg/L 67.8 µg/L 5 µg/L No DM08-W08
Water Surface Water Total Dissolved Solids N/A 192 mg/L 500 mg/L No DM08-W08
Water Surface Water Radium-226 <0.030 Bq/L <0.010 Bq/L 0.5 Bq/L No DM08-W08
Water Surface Water Selenium 0.13 µg/L 0.09 µg/L 1 µg/L No DM08-W08
Water Surface Water Molybdenum 0.23 µg/L 0.31 µg/L 73 µg/L No DM08-W08
Water Surface Water Inorganic Carbon N/A 22.63 mg/L N/A No DM08-W08
Water Surface Water Total Organic Carbon N/A 20.61 mg/L N/A No DM08-W08
Water Surface Water Total Carbon N/A 43.24 mg/L N/A No DM08-W08
Water Surface Water Total Suspended Solids <2.5 mg/L 1.2 mg/L N/A No DM08-W08
Water Surface Water Cobalt 0.81 µg/L 0.68 µg/L N/A No DM08-W08
Water Surface Water Uranium 0.18 µg/L <0.10 µg/L 15 µg/L No DM09-W09
Water Surface Water pH 8.4 8.27 6.5-9.0 No DM09-W09
Water Surface Water Gross Alpha <0.077 Bq/L <0.1 Bq/L 0.5 Bq/L No DM09-W09
Water Surface Water Gross Beta N/A <0.12 Bq/L 0.5 Bq/L No DM09-W09
Water Surface Water Gross Beta <0.090 Bq/L N/A 1 Bq/L No DM09-W09
Water Surface Water Copper 1.09 µg/L 1.06 µg/L 2 - 4 µg/L No DM09-W09
Water Surface Water Lead 0.07 µg/L <0.10 µg/L 1 - 7 µg/L No DM09-W09
Water Surface Water Nickel 4.86 µg/L 2.93 µg/L 25 - 150 µg/L No DM09-W09
Water Surface Water Zinc 0.99 µg/L <0.50 µg/L 30 µg/L No DM09-W09
Water Surface Water Arsenic 14.1 µg/L 19.5 µg/L 5 µg/L No DM09-W09
Water Surface Water Total Dissolved Solids N/A 197 mg/L 500 mg/L No DM09-W09
Water Surface Water Radium-226 <0.030 Bq/L <0.010 Bq/L 0.5 Bq/L No DM09-W09
Water Surface Water Selenium 0.12 µg/L 0.05 µg/L 1 µg/L No DM09-W09
Water Surface Water Molybdenum 0.23 µg/L 0.19 µg/L 73 µg/L No DM09-W09
Water Surface Water Inorganic Carbon N/A 21.29 mg/L N/A No DM09-W09
Water Surface Water Total Organic Carbon N/A 19.79 mg/L N/A No DM09-W09
Water Surface Water Total Carbon N/A 41.08 mg/L N/A No DM09-W09
Water Surface Water Total Suspended Solids <2.5 mg/L 0.4 mg/L N/A No DM09-W09
Water Surface Water Cobalt 0.41 µg/L 0.30 µg/L N/A No DM09-W09
Water Surface Water Uranium 0.16 µg/L <0.10 µg/L 15 µg/L No DM10-W10
Water Surface Water pH 8.6 8.04 6.5-9.0 No DM10-W10
Water Surface Water Gross Alpha <0.077 Bq/L <0.1 Bq/L 0.5 Bq/L No DM10-W10
Water Surface Water Gross Beta N/A <0.12 Bq/L 0.5 Bq/L No DM10-W10
Water Surface Water Gross Beta <0.090 Bq/L N/A 1 Bq/L No DM10-W10
Water Surface Water Copper 0.78 µg/L 3.43 µg/L 2 - 4 µg/L No DM10-W10
Water Surface Water Lead 0.02 µg/L 0.19 µg/L 1 - 7 µg/L No DM10-W10
Water Surface Water Nickel 2.76 µg/L 2.34 µg/L 25 - 150 µg/L No DM10-W10
Water Surface Water Zinc <0.11 µg/L <0.50 µg/L 30 µg/L No DM10-W10
Water Surface Water Arsenic 9.35 µg/L 12.5 µg/L 5 µg/L No DM10-W10
Water Surface Water Total Dissolved Solids N/A 155 mg/L 500 mg/L No DM10-W10
Water Surface Water Radium-226 <0.030 Bq/L <0.010 Bq/L 0.5 Bq/L No DM10-W10
Water Surface Water Selenium 0.09 µg/L 0.05 µg/L 1 µg/L No DM10-W10
Water Surface Water Molybdenum 0.21 µg/L 0.17 µg/L 73 µg/L No DM10-W10
Water Surface Water Inorganic Carbon N/A 16.8 mg/L N/A No DM10-W10
Water Surface Water Total Organic Carbon N/A 15.95 mg/L N/A No DM10-W10
Water Surface Water Total Carbon N/A 32.75 mg/L N/A No DM10-W10
Water Surface Water Total Suspended Solids <2.5 mg/L 0.4 mg/L N/A No DM10-W10
Water Surface Water Cobalt 0.36 µg/L 0.29 µg/L N/A No DM10-W10
Sediment 0-5 cm Uranium 2.83 mg/kg N/A 23 mg/kg dry weight No DM11-S11
Sediment 0-5 cm Copper 17.1 mg/kg N/A 16 - 110 mg/kg dry weight No DM11-S11
Sediment 0-5 cm Lead 15.2 mg/kg N/A 35 - 91.3 mg/kg dry weight No DM11-S11
Sediment 0-5 cm Nickel 25.5 mg/kg N/A 16 - 75 mg/kg dry weight No DM11-S11
Sediment 0-5 cm Zinc 112 mg/kg N/A 123 - 315 mg/kg dry weight No DM11-S11
Sediment 0-5 cm Arsenic 6.44 mg/kg N/A 5.9 - 17 mg/kg dry weight No DM11-S11
Sediment 0-5 cm Radium-226 21.4 Bq/kg dry weight N/A 4852 Bq/kg dry weight No DM11-S11
Sediment 0-5 cm Selenium 0.98 mg/kg N/A 1.9 - 16.1 mg/kg dry weight No DM11-S11
Sediment 0-5 cm Molybdenum 0.78 mg/kg N/A 13.8 - 1238 mg/kg dry weight No DM11-S11
Sediment 0-5 cm Cobalt 15.5 mg/kg N/A N/A No DM11-S11
Water Surface Water Uranium 0.17 µg/L N/A 15 µg/L No DM11-W11
Water Surface Water pH 8.0 N/A 6.5-9.0 No DM11-W11
Water Surface Water Gross Alpha <0.077 Bq/L N/A 0.5 Bq/L No DM11-W11
Water Surface Water Gross Beta <0.090 Bq/L N/A 1 Bq/L No DM11-W11
Water Surface Water Copper 0.66 µg/L N/A 2 - 4 µg/L No DM11-W11
Water Surface Water Lead 0.03 µg/L N/A 1 - 7 µg/L No DM11-W11
Water Surface Water Nickel 0.41 µg/L N/A 25 - 150 µg/L No DM11-W11
Water Surface Water Zinc 0.20 µg/L N/A 30 µg/L No DM11-W11
Water Surface Water Arsenic 1.61 µg/L N/A 5 µg/L No DM11-W11
Water Surface Water Radium-226 <0.030 Bq/L N/A 0.5 Bq/L No DM11-W11
Water Surface Water Selenium 0.14 µg/L N/A 1 µg/L No DM11-W11
Water Surface Water Molybdenum 0.19 µg/L N/A 73 µg/L No DM11-W11
Water Surface Water Total Suspended Solids <2.5 mg/L N/A N/A No DM11-W11
Water Surface Water Cobalt 0.13 µg/L N/A N/A No DM11-W11

1 The < symbol indicates that a result is below the provided laboratory analytical detection limit.

2 N/A – not available

CNSC staff collecting a water sample near the Deloro closed mine site in 2018.

Background

Under the Nuclear Safety and Control Act (NSCA), licensees of nuclear facilities are required to implement an environmental monitoring program to demonstrate that the public and the environment are protected from emissions related to their facilities’ nuclear activities. The results of these monitoring programs are submitted to the CNSC to ensure compliance with applicable guidelines and limits, as set out in the regulations that oversee Canada's nuclear industry.

The CNSC has implemented its IEMP to verify that the public and the environment around licensed nuclear facilities are protected. It is separate from, but complementary to, the CNSC's ongoing compliance verification program. The IEMP involves taking samples from publicly accessible areas around facilities, and measuring and analyzing the amount of radioactive and hazardous substances in those samples. CNSC staff collect the samples and send them to the CNSC's independent laboratory for testing and analysis. Since the IEMP’s implementation, the area outside of the Deloro site perimeter has been sampled twice: once in 2016 and once in 2018.

2016 and 2018 results

The 2016 and 2018 IEMP sampling plan for the Deloro site focused on both radioactive and hazardous contaminants. A site-specific sampling plan was developed based on the MECP's environmental monitoring program and the CNSC’s regulatory experience with the site. In 2016 and 2018, CNSC staff collected sediment and water samples in publicly accessible areas outside the site perimeter, taking into account the known dispersion pathways. This included sampling locations along Young's Creek offsite and the Moira River downstream from the site.

The results of the radioactive analysis in sediment and water samples were below available guidelines and CNSC screening levels. CNSC screening levels are based on conservative assumptions about the exposure that would result in a dose of 0.1 mSv/year. No health impacts are expected at this dose level.

The results of the hazardous analysis showed elevated concentrations of copper and arsenic in some surface water samples and elevated concentrations of nickel, copper, and arsenic in some sediment samples. These water and sediment samples exceed CCME guidelines; however, these heavy metals are contaminants from historical industrial processes at the Deloro site. The concentrations of arsenic in water and sediments of the Moira River system near the Deloro site also exceed CCME guidelines. For some parameters, such as aluminum, cobalt and total organic carbon in sediment, there are no guidelines or CNSC screening values available. The results are consistent and within the range of the MECP’s results and the environmental assessment (EA) conducted as part of the CNSC licensing process for this provincial remediation project. Arsenic at the Deloro site has been significantly reduced further as a result of remediation activities performed by the licensee. Additional planned remediation activities are expected to further reduce arsenic concentrations; however, as the arsenic concentrations are elevated, there is a water consumption advisory downstream of the Deloro site. View detailed sampling data.

Conclusions

The MECP has committed to the ongoing remediation and long-term monitoring and maintenance of the Deloro site. Remediation activities put in place by the MECP have and will continue to ensure that this historic contamination is controlled and managed and that the public is protected. The IEMP results are consistent with those submitted by the MECP, demonstrating that the licensee's environmental protection program protects the health and safety of people and the environment.

To obtain the full technical IEMP report, contact us at cnsc.information.ccsn@canada.ca or call 613-995-5894 or 1-800-668-5284 (in Canada). Please provide the name of the facility and the report year.

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