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Priority Substances List Assessment Report for Inorganic Chloramines

3.0 Assessment of "Toxic" under CEPA 1999

3.1.2.2.2 Conservative risk assessment

Table 7 Summary of conservative assessment EECs and quotients for effluents and cooling water discharges to rivers and marine environments ¹
Location	Approximate maximum EECs (mg/L) for distances (m) from source							Quotients (i.e., EEC ÷ ENEV) for distances (m) from source
Location	20	50	100	200	300	400	500	20	50	100	200	300	400	500
River discharges
North Toronto WWTP - Don River	n/a	n/a	0.746	0.595	0.567	0.547	0.521	n/a	n/a	133	106	101	98	93
Okotoks WWTP - Sheep River	0.292	n/a	0.159	0.115	0.095	n/a	n/a	52	n/a	28	21	17	n/a	n/a
Edmonton Power, Clover Bar Generating Station - North Saskatchewan River	0.855	n/a	0.601	0.524	0.468	n/a	n/a	153	n/a	107	94	84	n/a	n/a
Edmonton Rossdale WTP - North Saskatchewan River	0.050	n/a	0.031	0.026	0.022	n/a	n/a	9	n/a	6	5	4	n/a	n/a
Edmonton E.L. Smith WTP - North Saskatchewan River	0.039	n/a	0.024	0.020	0.017	n/a	n/a	7	n/a	4	4	3	n/a	n/a
R.O. Pickard Environmental Centre - Ottawa River	n/a	n/a	0.026	0.026	0.025	0.025	0.024	n/a	n/a	5	5	5	4	4
Saskatoon WWTP - South Saskatchewan River	n/a	0.018	0.013	0.010	0.010	0.010	0.010	n/a	3	2	2	2	2	2
Lethbridge WTP - Oldman River	n/a	0.021	0.011	0.008	0.007	0.006	n/a	n/a	4	2	1	1	1	n/a
Britannia WTP - Ottawa River	n/a	0.005 7	0.004	0.002 8	0.002 3	0.002	0.001 8	n/a	1	1	1	0.41	0.36	0.32
Saskatoon WTP - South Saskatchewan River	n/a	0.003 2	0.002 3	0.001 6	0.001 3	0.001 1	n/a	n/a	0.6	0.4	0.3	0.2	0.2	n/a
Medicine Hat WWTP - South Saskatchewan River	n/a	0.004 1	0.003 9	0.003 6	0.003 4	0.003 2	0.003 1	n/a	0.7	0.7	0.7	0.6	0.6	0.5
Prince Albert WWTP - North Saskatchewan River	n/a	0.002 7	0.001 9	0.001 3	0.001 1	0.000 9	0.000 8	n/a	0.5	0.3	0.2	0.2	0.2	0.2
Nelson WWTP - Kootenay River	0.001 8	n/a	0.001 8	0.003 4	0.003 5	n/a	n/a	0.3	n/a	0.3	0.6	0.6	n/a	n/a
Trail WWTP - Columbia River	0.000 4	n/a	0.000 5	0.001	0.000 3	n/a	n/a	0.07	n/a	0.1	0.2	0.1	n/a	n/a
Marine discharges
Charlottetown WWTP - Hillsborough River Estuary	n/a	0.000 3	0.000 2	0.000 1	0.000 1	0.000 08	0.000 07	n/a	0.05	0.03	0.02	0.02	0.01	0.01
Eastern Passage WWTP - Halifax Harbour	n/a	0.000 5	0.000 4	0.000 3	0.000 2	0.000 2	0.000 1	n/a	0.09	0.07	0.05	0.04	0.03	0.02

¹Source: McCullum et al. (2000).