The provisions of this subpart are applicable to discharges resulting from the production of sodium dichromate and by-product sodium sulfate.
For the purpose of this subpart:
(a) Except as provided below, the general definitions, abbreviations and methods of analysis set forth in 40 CFR part 401 shall apply to this subpart.
(b) The term product shall mean sodium dichromate.
(c) The term Cr(T) shall mean total chromium.
(d) The term Cr(+ 6) shall mean hexavalent chromium.
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):
Subpart Q—Sodium Dichromate
| Pollutant or pollutant property
| BPT limitations
|
|---|
| Maximum for any 1 day
| Average of daily values for 30 consecutive days
|
|---|
| Kg/kkg (or pounds per 1,000 lb) of product
|
| TSS | 0.44 | 0.22
|
| Hexavalent Chromium | 0.00090 | 0.00050
|
| Chromium (T) | 0.0088 | 0.0044
|
| Nickel (T) | 0.0068 | 0.0034
|
| pH | (
1) | (
1)
|
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 available technology economically achievable (BAT): The limitations for Chromium (T), Hexavalent Chromium, and Nickel (T) are the same as specified in § 415.172.
Any new source subject to this subpart must achieve the following new source performance standards (NSPS): The limitations are the same as specified in § 415.172.
Except as provided in 40 CFR 403.7, any new source subject to this subpart which introduces pollutants into a publicly owned treatment works must comply with 40 CFR part 403 and achieve the following Pretreatment Standards for New Sources (PSNS):
Subpart Q—Sodium Dichromate
| Pollutant or pollutant property
| PSNS effluent limitations
|
|---|
| Maximum for any 1 day
| Average of daily values for 30 consecutive days
|
|---|
| Milligrams per liter
|
| Chromium (T) | 1.0 | 0.50
|
| Hexavalent Chromium | 0.11 | 0.060
|
| Nickel (T) | 0.80 | 0.40 |
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 conventional pollutant control technology (BCT): The limitations are the same for TSS and pH as specified in § 415.172.
authority: Secs. 301, 304 (b), (c), (e), and (g), 306 (b) and (c), 307 (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,
c,
e,
and, 1316 (b) and
c, 1317 (b) and
c,
and; 86 Stat. 816, Pub. L. 92-500; 91 Stat. 1567, Pub. L. 95-217
source: 47 FR 28278, June 29, 1982, unless otherwise noted.
cite as: 40 CFR 415.173