TABLE 2.
Occurrences of human sewage marker HF183 and A. butzleri marker (hsp60) alongside U.S. EPA (59) recreational water quality criteria exceedances (boldface representing criteria that were violated) for routine stormwater outfall samples taken at Nose Creek outfalls (n = 38) in Airdrie, Alberta, Canada
| Nose Creek site | n | A. butzleri marker (hsp60) frequency (%) | HF183 marker frequency (%) | A. butzleri and HF183 marker co-detection frequency (%) | Enterococcus site GM (log10)a | E. coli site GM (log10)a | Enterococcus site STV exceedance (%)b | E. coli site STV exceedance (%)b |
|---|---|---|---|---|---|---|---|---|
| N#1 | 5 | 1/5 (20.0) | 5/5 (100.0) | 1/5 (20.0) | 3.29 | 2.03 | 2/5 (40.0) | 2/5 (40.0) |
| N#2 | 4 | 4/4 (100.0) | 3/4 (75.0) | 3/4 (75.0) | 3.59 | 2.18 | 3/4 (75.0) | 1/4 (25.0) |
| N#3 | 4 | 2/4 (50.0) | 1/4 (25.0) | 1/4 (25.0) | 3.44 | 2.18 | 2/4 (50.0) | 1/4 (25.0) |
| N#4 | 4 | 3/4 (75.0) | 3/4 (75.0) | 3/4 (75.0) | 4.19 | 2.81 | 3/4 (75.0) | 2/4 (50.0) |
| N#5 | 4 | 2/4 (50.0) | 3/4 (75.0) | 2/4 (50.0) | 3.73 | 2.48 | 2/4 (50.0) | 2/4 (50.0) |
| N#6 | 4 | 3/4 (75.0) | 2/4 (50.0) | 2/4 (50.0) | 3.85 | 2.54 | 4/4 (100.0) | 2/4 (50.0) |
| N#7 | 4 | 2/4 (50.0) | 1/4 (25.0) | 1/4 (25.0) | 2.87 | 1.53 | 1/4 (25.0) | 1/4 (25.0) |
| N#8 | 4 | 3/4 (75.0) | 3/4 (75.0) | 3/4 (75.0) | 3.49 | 1.83 | 2/4 (50.0) | 1/4 (25.0) |
| NP#1 | 5 | 1/5 (20.0) | 1/5 (20.0) | 0 | 3.08 | 1.07 | 2/5 (40.0) | 0 |
| Total | 38 | 21/38 (55.3) | 22/38 (57.9) | 16/38 (42.1) | N/A | N/A | 21/38 (55.3) | 12/38 (31.6) |
a
Enterococcus and E. coli GM of 300 CCE/100 mL and 100 MPN/100 mL, respectively, were used as water quality criteria, with bold values indicating those that exceeded these criteria (59).
b
Enterococcus and E. coli STVs were 1,280 CCE/100 mL and 320 MPN/100 mL, respectively, with bold values indicating those sites where >10% of samples exceeded these values (59).