§ 2.2 ABNORMAL WASTE SURCHARGE.

   (A)   In the event an IU discharges abnormal industrial wastes to the POTW having an average total suspended solids (TSS) content in excess of 250 mg/l and/or an average of five day BOD in excess of 225 mg/l, and/or an average of COD in excess of 500 mg/l, the customer will be subject to a surcharge based upon the excess strength of his waste at the rates established in § 51.166 of this code.

   (B)   No reduction in sewerage service charges, fees, or taxes will be permitted because of the fact that certain industrial wastes discharged to the public sanitary sewerage system contain less than 250 mg/l of total suspended solids, or 225 mg/l BOD5.

(Ord. 1998-20, passed 11-17-98; Am. Ord. 2012-19, passed 9-18-12; Am. Ord. 2019-9, passed 12-3-19)

§ 2.3 NATIONAL CATEGORICAL PRETREATMENT STANDARDS.

   The categorical pretreatment standards found at 40 CFR Chapter I Subchapter N, Parts 405-471 are hereby incorporated.

   (A)   Where a categorical pretreatment standard is expressed only in terms of either the mass or the concentration of a pollutant in wastewater, the Utilities Manager may impose equivalent concentration or mass limits in accordance with 40 CFR 403.6(c).

   (B)   When wastewater subject to a categorical pretreatment standard is mixed with wastewater not regulated by the same standard, the Utilities Manager shall impose an alternate limit using the combined wastestream formula in 40 CFR 403.6(e).

   (C)   A user may apply for a variance from a categorical pretreatment standard if the user can prove, pursuant to the procedural and substantive provisions in 40 CFR 403.13, that factors relating to its discharge are fundamentally different from the factors considered by EPA when developing the categorical pretreatment standard.

   (D)   A user may apply for a net gross adjustment to a categorical standard in accordance with 40 CFR 403.15.

(Ord. 1998-20, passed 11-17-98; Am. Ord. 2012-19, passed 9-18-12)

§ 2.4 LOCAL LIMITS.

   (A)   The following pollutant limitations are established to protect against pass through and interference. No person shall discharge wastewater containing in excess of the following daily. maximum concentrations based upon a 24-hour composite sample. Additionally, no person shall discharge wastewater containing in excess of the following maximum concentrations times a multiplier of 1.5 based upon a grab sample. The 1.5 grab sample multiplier does not apply to Hex. Chromium, Cyanide and Phenols in that analytical procedures do not allow for composite techniques to be applied to these parameters. For Hex. Chromium, Cyanide and Phenols, three grab sample results shall be analyzed with results not to exceed the following noted limitations.

.168 mg/l Arsenic (total)[1]

.034 mg/l Cadmium (total)[1]

.143 mg/l Hex. Chromium

10.8 mg/l Total Chromium

1.13 mg/l Copper[2]

.515 mg/l Cyanide (total)[2]

.40 mg/l Lead (total)[1]

.03 mg/l Mercury (total)[1]

.067 mg/l Molybdenum (total)[1]

2.52 mg/l Nickel[1]

[1]   Limitation determination based upon U.S. EPA 40 CFR Part 503 Biosolids Regulations.

[2]   Limitation determination based upon NPDES Daily Effluent Limitations.

 

100 mg/l Oil & Grease[3]

.09 mg/l Selenium[1]

.5 mg/l Silver

1.0 mg/l Phenols

3.62 mg/l Zinc (total)[1]

[1]   Limitation determination based upon U.S. EPA 40 CFR Part 503 Biosolids Regulations.

[3]   As an alternative to the total oil and grease limitations established by this section, the Control Authority may establish in an IWP a limitation of 100 mg/1 for non-polar grease. The alternative limitation is subject to the following conditions:

1.   The user submits an application for the alternative limit;

2.   The user provides information regarding the user's products, processes, and operations that shows to the Control Authority's satisfaction that the oil and grease discharge by the user is predominantly of animal or vegetable origin;

3.   The user shows that the oil and grease in the user's discharges is not visible, free, or floating at 50 F at any time;

4.   The user has sampling facilities that allow for both visual inspections of the user's discharge and using the equipment necessary for collection samples for floatable oil and grease;

5.   The oil and grease in the user's discharge is not related to past instances of obstruction, interference, or pass though;

6.   Users subject to the alternative limit shall continue to operate and maintain grease traps and any other oil and grease separation and treatment equipment and shall continue all existing practices that reduce discharge of oil and grease;

7.   If the Control Authority determines that a user subject to the alternative limits has caused, along or in conjunction with other discharge, obstructions, interference, or pass through, then the user shall comply with the total oil and grease limitation or another appropriate limitation established by the District in the user's IWP; and

8.   Any other appropriate conditions set forth in the user's SIU.

 

   (B)   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 Utilities Manager may impose mass limitations in addition to, or in place of, the concentration-based limitations above.

   (C)   Upon the promulgation of the National Categorical Pretreatment Standard (NCPS) for a particular user, the said standard, if more stringent then the limitations imposed under this appendix for sources in that category, shall, when effective, immediately supersede the limitations and conditions imposed under this appendix. The Utility Manager shall notify all known affected users of the applicable permitting and reporting requirements under 40 CFR 403.12.

(Ord. 1998-20, passed 11-17-98; Am. Ord. 2012-19, passed 9-18-12; Am. Ord. 2019-9, passed 12-3-19)

§ 2.5 BOARD'S RIGHT OF REVISION.

   The Board reserves the right to establish, by ordinance or in wastewater discharge permits, more stringent standards or requirements on discharges to the POTW consistent with the purposes of this appendix.

(Ord. 1998-20, passed 11-17-98; Am. Ord. 2012-19, passed 9-18-12)

§ 2.6 DILUTION.

   No user shall ever increase the use of process water, or in any way attempt to dilute a discharge, as a partial or complete substitute for adequate treatment to achieve compliance with a discharge limitation unless expressly authorized by an applicable pretreatment standard or requirement. The Utilities Manager may impose mass limitations on users who are using dilution to meet applicable pretreatment standards or requirements or in other cases when the imposition of mass limitations is appropriate.

(Ord. 1998-20, passed 11-17-98; Am. Ord. 2012-19, passed 9-18-12)

PRETREATMENT OF WASTEWATER

§ 3.1 PRETREATMENT FACILITIES.

   Users shall provide wastewater treatment as necessary to comply with this appendix and shall achieve compliance with all categorical pretreatment standards, local limits, and the prohibitions set out in § 2.1 of this appendix within the time limitations specified by EPA, the state, or the Utilities Manager, whichever is more stringent Any facilities necessary for compliance shall be provided, operated, and maintained at the user's expense. Detailed plans describing such facilities and operating procedures shall be submitted to the Utilities Manager for review, and shall be acceptable to the Utilities Manager before such facilities are constructed. The review of such plans and operating procedures shall in no way relieve the user from the responsibility of modifying such facilities as necessary to produce a discharge acceptable to the city under the provisions of this appendix.

(Ord 1998-20, passed 11-17-98; Am. Ord. 2012-19, passed 9-18-12)