Table 9. Top ten highest carbon-normalized (specific) disinfection by-product formation potentials for filtered and unfiltered samples.
[Sampling site locations are shown in figure 1. Specific disinfection by-product formation potential concentrations calculated by dividing the filtered/unfiltered formation potentials by the dissolved organic carbon (DOC) and total organic carbon (TOC) concentrations, respectively. Abbreviations: THM4/HAA5, total trihalomethanes/total haloacetic acids]
| Sampling site |
Date |
Concentration
(milligrams
of DBP per
milligram of
carbon) |
| Specific trihalomethane formation potential |
| Filtered |
| North Fork Reservoir (release depth) |
09-21-11 |
0.208 |
| Clackamas River at Carver |
09-09-11 |
0.176 |
| Clackamas River at Estacada |
09-22-11 |
0.169 |
| Lake Oswego–Source water |
09-22-11 |
0.169 |
| Clackamas River at Estacada |
09-09-11 |
0.160 |
| Clackamas River at Barton Bridge |
09-22-11 |
0.158 |
| Clackamas River Water–Source water |
09-22-11 |
0.156 |
| Clackamas River at Barton Bridge |
09-09-11 |
0.149 |
| Clackamas River at Carver |
09-22-11 |
0.142 |
| Clackamas River at Carter Bridge |
09-08-11 |
0.137 |
| Unfiltered |
| Lake Oswego–Source water |
09-22-11 |
0.201 |
| Clackamas River at Barton Bridge |
09-22-11 |
0.196 |
| Clackamas River at Carver |
09-22-11 |
0.194 |
| Clackamas River at Barton Bridge |
09-09-11 |
0.189 |
| Clackamas River Water–Source water |
09-22-11 |
0.176 |
| Clackamas River Water–Source water |
09-09-11 |
0.146 |
| Clackamas River at Estacada |
09-22-11 |
0.140 |
| Clackamas River at Carver |
09-09-11 |
0.135 |
| Eagle Creek |
09-08-11 |
0.131 |
| Clackamas River at Estacada |
09-09-11 |
0.126 |
| Specific haloacetic acid formation potential |
| Filtered |
| Deep Creek |
10-10-10 |
0.089 |
| Eagle Creek |
10-10-10 |
0.081 |
| Clear Creek |
10-10-10 |
0.081 |
| Rock Creek |
10-10-10 |
0.070 |
| Sieben Creek |
10-10-10 |
0.070 |
| Sieben Creek |
09-18-10 |
0.068 |
| North Fork Reservoir (hypolimnion) |
08-04-10 |
0.049 |
| Clackamas River at Carter Bridge |
10-10-10 |
0.049 |
| North Fork Reservoir (metalimnion) |
09-03-10 |
0.049 |
| North Fork Reservoir (release depth) |
08-04-10 |
0.048 |
| Unfltered |
| Eagle Creek |
10-10-10 |
0.094 |
| Clear Creek |
10-10-10 |
0.080 |
| Deep Creek |
10-10-10 |
0.069 |
| Clackamas River Water–Source water |
04-19-11 |
0.067 |
| Sieben Creek |
10-10-10 |
0.066 |
| Rock Creek |
10-10-10 |
0.065 |
| Clackamas River at Carter Bridge |
10-10-10 |
0.062 |
| Clackamas River Water–Source water |
10-10-10 |
0.060 |
| Lake Oswego–Source water |
10-10-10 |
0.055 |
| Clear Creek |
09-08-11 |
0.053 |
|
First posted February 11, 2013
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U.S. Department of the Interior |
U.S. Geological Survey