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| Subpart G | Wood Preserving Steam Subcategory | 429.80 – 429.86 | |||||||||||||||||||||
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Secs. 301, 304(b), (c), (e), and (g), 306(b) and (c), 307(a)(b) and (c) and 501 of the Clean Water Act (the Federal Water Pollution Control Act Amendments of 1972, as amended by the Clean Water Act of 1977) (the “Act”); 33 U.S.C. 1311, 1314(b), (c), (e), and (g), 1316(b) and (c), 1317(b) and (c), and 1361; 86 Stat. 815, Pub. L. 92-500; 91 Stat. 1567, Pub. L. 95-217.
46 FR 8285, Jan. 26, 1981, unless otherwise noted.
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This subpart applies to discharges to waters of the United States and to the introduction of process wastewater pollutants into publicly owned treatment works from wood preserving processes that use direct steam impingment on wood as the predominant conditioning method; processes that use the vapor drying process as the predominant conditioning method; direct steam conditioning processes which use the same retort to treat with both salt and oil type preservatives; and steam conditioning processes which apply both salt type and oil type preservatives to the same stock.
Except as provided in 40 CFR 125.30 through 125.32, any existing point source subject to this subpart must achieve the following effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available (BPT):
| Pollutant or pollutant property | BPT Effluent Limitations | |
|---|---|---|
| Maximum for any 1 day | Average of daily values for 30 consecutive days | |
| English units (lb/1000 cubic feet of product) | ||
| COD | 68.5 | 34.5 |
| Phenols | .14 | .04 |
| Oil and Grease | 1.5 | .75 |
| pH | (1) | (1) |
| Metric units (kg/1000 cu m of product) | ||
| COD | 1,100 | 550 |
| Phenols | 2.18 | .65 |
| Oil and Grease | 24.0 | 12.0 |
| pH | (1) | (1) |
| 1 Within the range of 6.0 to 9.0 at all times. | ||
Any new source subject to this subpart must achieve the following new source performance standards (NSPS): There shall be no discharge of process wastewater pollutants into navigable waters.
Except as provided in 40 CFR 403.7 and 403.13, any existing source subject to this subpart which introduces process wastewater pollutants into a publicly owned treatment works must comply with 40 CFR part 403 and meet the following pretreatment standards for existing sources (PSES):
| Pollutant or pollutant property | Maximum for any 1 day (mg/l) |
|---|---|
| Oil and grease | 100 |
| Copper | 5 |
| Chromium | 4 |
| Arsenic | 4 |
In cases where POTWs find it necessary to impose mass limitations, the following equivalent mass limitations are provided as guidance.
| Pollutant or pollutant property | Maximum for any 1 day |
|---|---|
| Oil and grease | 20.5 |
| Copper | .62 |
| Chromium | .41 |
| Arsenic | .41 |
Except as provided in 40 CFR 403.7, any new source subject to this subpart which introduces process wastewater pollutants into a publicly owned treatment works must comply with 40 CFR part 403 and achieve the following pretreatment standards for new sources (PSNS): There shall be no introduction of process wastewater pollutants into publicly owned treatment works.