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Environmental and Workplace Health

Priority Substances List Assessment Report for Road Salts

2.0 Summary of Information Critical to Assessment of "Toxic" Under CEPA 1999

2.1.2 Physical and chemical properties

Table 9 Chloride concentrations in various streams in the Toronto Remedial Action Plan watershed for 1990-96 (from Toronto and Region Conservation Authority, 1998)

Station location

No. of observations

Minimum (mg/L)

Maximum (mg/L)

Mean (mg/L)

Median (mg/L)

% frequency exceedence

250 mg/L

500 mg/L

Etobicoke Creek

at Derry Road

38

10

3780

278

135

18

8

at Burnhamthorpe Rd.

40

0

2670

392

206

40

20

at Highway #2

74

43

2140

351

208

38

19

Mimico Creek

at Highway #2

37

51

3470

553

276

62

22

Black Creek

at Scarlett Rd.

38

20

4310

495

248

47

21

Highland Creek

at Highway Creek Park

55

22

1390

310

220

42

13

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