§ 28-212. National categorical pretreatment standards.

The categorical pretreatment standards found at 40 CFR Chapter I, Subchapter N, Parts 405—471 are hereby incorporated. Those standards, if more stringent than the limitations imposed by the latest approved "Technically Based Local Limits Development Document" for sources in that sub-category, shall supersede the limitations imposed by the local limits.

(1)

When the limits in a categorical pretreatment standard are expressed only in terms of mass of pollutant per unit of production, the manager may convert the limits to equivalent limitations expressed either as mass of pollutant discharged per day or effluent concentration for purposes of calculating effluent limitations applicable to individual industrial users. In accordance with 40 CFR 403.6(c)(2).

(2)

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

(3)

Once included in its permit, the industrial user must comply with the equivalent limitations developed in this section 28-212 in lieu of the promulgated categorical standards from which the equivalent limitations were derived. See 40 CFR 403.6(c)(7).

(4)

Any industrial user operating under a permit incorporating equivalent mass or concentration limits calculated from a production-based standard shall notify the manager within two (2) business days after the user has a reasonable basis to know that the production level will significantly change within the next calendar month. Any user not notifying the manager of such anticipated change will be required to meet the mass or concentration limits in its permit that were based on the original estimate of the long term average production rate. See CFR 403.6(c)(9).

(Ord. No. 6381, § 2.2, 2-21-12)