The National Categorical Pretreatment Standards found at 40
CFR Chapter I, Subchapter N, Parts 405 through 471, are hereby incorporated.
The City of Las Vegas reserves the right to establish, by ordinance or in wastewater discharge permits, more stringent standards or requirements on discharges to the POTW if deemed necessary to comply with the objectives presented in §
435-1 of this chapter or the general and specific prohibitions in § 235-5 of this chapter.
The City of Las Vegas reserves the right to enter into special
agreements with industrial users setting out special terms under which
they may discharge to the POTW. In no case will a special agreement
waive compliance with a pretreatment standard or requirement. However,
the industrial user may request a net gross adjustment of a categorical
standard in accordance with 40 CFR 403.15. They may also request,
from EPA, a variance from the categorical pretreatment standard. Such
a request will be approved only if the industrial user can prove that
factors relating to its discharge are fundamentally different from
the factors considered by EPA when establishing that particular pretreatment
standard. An industrial user requesting a variance must comply with
the procedural and substantive provisions in 40 CFR 403.13.
No industrial user shall 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 Supervisor may impose mass limitations
on industrial users which are using dilution to meet applicable pretreatment
standards or requirements, or in other cases when the imposition of
mass limitations is appropriate.