§ 54.16 ABNORMAL WASTE SURCHARGE.

   (A)   In the event the Approving Authority excludes a customer from the requirements of § 54.16 and the customer discharges abnormal industrial wastes to the public sanitary sewerage system having an average total suspended solids content in excess of 250 mg/l and/or an average of 5-day BOD in excess of 200 mg/l and/or COD in excess of 400 mg/l, the customer shall pay a surcharge based upon the excess strength of his or her wastes.

   (B)   The costs of treatment for each pound of BOD and/or suspended solids removed by the treatment works shall be calculated and reviewed by the city at the end of each fiscal year (January). If a discrepancy exists between the actual costs as found by the city and the estimated costs, the Approving Authority may increase or decrease the surcharge rates sufficiently to cover only the projected actual costs for the ensuing year.

   (C)   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 sewer system contain less than 250 mg/l of suspended solids or 200 mg/l BOD.

(Ord. 842, passed 4-1-2000)

§ 54.17 NATIONAL CATEGORICAL PRETREATMENT STANDARDS.

   The categorical pretreatment standards found at 40 CFR Chapter 1, 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 Superintendent 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 Superintendent shall impose an alternate limit using the combined wastestream formula in 40 CFR 403.6(e).

   (C)   A user may obtain a variance from a categorical pretreatment 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 obtain a net gross adjustment to a categorical standard in accordance with 40 CFR 403.15.

(Ord. 842, passed 4-1-2000)

§ 54.18 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 concentration 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:

      (1)   0.08 mg/l arsenic (total);

      (2)   400 mg/l BOD (daily maximum);

      (3)   550 mg/l COD (daily maximum)

      (4)   0.025 mg/l cadmium (total)1;

      (5)   3.0 mg/l hex. chromium1;

      (6)   800 mg/l chloride;

      (7)   3.0 mg/l total chromium1;

      (8)   250 mg/l total suspended solids (daily maximum);

      (9)   0.233 mg/l copper1;

      (10)   0.074 mg/l cyanide (total)1;

      (11)   0.17 mg/l lead (total)1;

      (12)   0.005 mg/l mercury (total)1;

      (13)   0.06 mg/l molybdenum2

      (14)   0.30 mg/l nickel1;

      (15)   100 mg/l oil and grease;

      (16)   1.00 mg/l phenols;

      (17)   0.08 mg/l selenium;

      (18)   2.13 mg/l TTO;

      (19)   0.5 mg/l zinc (total)2

   (B)   In divisions (A)(1) through (19) above, 1 indicates that the limitation is derived from a waste load model based upon 1990 State Water Quality Standards, and 2 indicates that the limitation is derived from a waste load model based upon Federal Sludge Regulations, the same being 40 CFR Part 503.

   (C)   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 Superintendent may impose limitations in addition to, or in place of, the concentration based limitations above.

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

(Ord. 842, passed 4-1-2000) Penalty, see § 10.99

§ 54.19 CITY'S RIGHT OF REVISION.

   The Board reserves the right to establish, by ordinance, more stringent standards or requirements on discharges to the POTW.

(Ord. 842, passed 4-1-2000)

§ 54.20 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 Superintendent 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. 842, passed 4-1-2000) Penalty, see § 10.99