§ 51.031 LOCAL LIMITS.
   (A)   The following specific discharge limits apply to all users. No user shall discharge wastewater containing in excess of the following daily maximum allowable discharge limits
Arsenic
0.473 mg/l
Benzene
0.500 mg/l
Cadmium
0.110 mg/l
Chromium
2.770 mg/l
Copper
1.184 mg/l
Cyanide (amenable)
0.473 mg/l
Lead
0.377 mg/l
Mercury
Less than quantification level (1) below
Nickel
1.786 mg/l
Selenium
0.083 mg/l
Total BTEX (sum of benzene, toulene, ethylbenzene, and xylene)
5.000 mg/l
Total PCBs
Less than quantification level (2) below
Zinc
1.162 mg/l
BOD
493 mg/l (3)
TSS
1100 mg/l (4)
Phosphorus
7 mg/l (5)
Ammonia nitrogen
77 mg/l (6)
NOTES:
(1)   The sampling procedures, preservation, and handling, and analytical protocol for mercury shall be in accordance with EPA Method 245.1. The quantification level shall not exceed 0.0002 mg/l unless a higher level is appropriate due to sample matrix interference. The local limit for mercury is less than the quantification level using the specified analytical method. Any discharge of mercury at or above the quantification level is a specific violation of this subchapter. If all the samples in any reporting period are less than the quantification level, the city will consider the permittee to be in compliance with the local limit for these pollutants for that reporting period, provided that the permittee is also in full compliance with the minimization program set forth in its wastewater discharge permit (if applicable). This note does not authorize the discharge of mercury at levels which are injurious to the designated uses of the waters of the state or which constitute a threat to the public health, welfare, worker health or safety, or sludge disposal.
(2)   The sampling procedures, preservation, and handling, and analytical protocol for total PCBs shall be in accordance with EPA Method 608. The quantification level shall be the quantification level specified in the NPDES permit, as amended or reissued from time to time, unless a higher level is appropriate due to sample matrix interference. The local limit for total PCBs is less than the quantification level using the specified analytical method. Any discharge of PCB at or above the quantification level is a specific violation of this subchapter. Except as provided in division (B) below, if all the samples in any reporting period are less than the quantification level, the city will consider the permittee to be in compliance with the local limit for these pollutants for that reporting period, provided that the permittee is also in full compliance with the minimization program set forth in its wastewater discharge permit (if applicable). This note does not authorize the discharge of PCBs at levels which are injurious to the designated uses of the waters of the state or which constitute a threat to the public health, welfare, worker health or safety, or sludge disposal. Total PCBs shall be defined as the sum of all Aroclor-specific measurements at or above the quantification level including, but not limited to, Aroclors 1016, 1221, 1232, 1242, 1248, 1254, and 1260, with any Aroclor result less than the quantification level being treated as zero. In addition, any detected Aroclor-specific measurements shall be reported.
(3)   Any discharge of BOD in excess of 200 mg/l shall be subject to surcharge, per § 51.071.
(4)   Any discharge of TSS in excess of 350 mg/l shall be subject to surcharge, per § 51.071.
(5)   Any discharge of phosphorus in excess of 4.0 mg/l shall be subject to surcharge, per § 51.071.
(6)   Any discharge of ammonia nitrogen in excess of 30 mg/l shall be subject to surcharge, per § 51.071.
The above limits apply at the point where the wastewater is discharged to the POTW. All concentrations for metallic substances are for “total” metal unless indicated otherwise. The Director may impose mass limitations in addition to, or in place of, any of the concentration-based limitations above.
 
   (B)   The Director may impose a mass limitation in addition to, or in place of, the concentration-based limitation for total PCBs on a user with total PCBs in wastewater at the user’s facility at or above the quantification level, even if the total PCBs in wastewater are at a location upstream from the point at which the user’s wastewater discharges to the POTW. The mass limitation shall be developed to ensure that the city’s NPDES permit discharge limitation for total PCBs is not violated due to pass through of total PCBs. Compliance with the mass limitation shall be determined at the point where wastewater is discharged to the POTW by calculating the mass of total PCBs discharged by the user using flow and concentration data for all of the wastewater streams at the user’s facility that contribute to the user’s discharge to the POTW.
(Prior Code, § 51.26) (Ord. D-1927, passed 7-15-2002, effective 8-1-2002) Penalty, see § 51.999