A. The categorical pretreatment standards found at 40 CFR Chapter I, Subchapter N, Parts 405-471 are hereby incorporated.
B. Where a categorical pretreatment standard is expressed only in terms of either the mass or the concentration of a pollutant in industrial wastewater, the Director of Public Works may impose equivalent concentration or mass limits in accordance with 40 CFR 403.6(c).
C. When industrial wastewater subject to a categorical pretreatment standard is mixed with wastewater not regulated by the same standard, the Director of Public Works shall impose an alternate limit using the combined wastestream formula in 40 CFR 403.6(e).
D. A user may obtain 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.
E. A user may obtain a net gross adjustment to a categorical standard in accordance with 40 CFR 403.15.