The national categorical pretreatment standards found at 40
CFR Chapter I, Subchapter N, Parts 405 to 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 Director 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 prior to treatment with wastewater not regulated by the same
standard, the Director shall impose an alternate limit using the combined
waste stream formula in 40 CFR 403.6(e).
C. A user may obtain a variance from a categorical pretreatment standard
if the user can prove to the satisfaction of the Director and the
approval authority, 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 the 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.
The following pollutant limits are established to protect against
pass-through and interference. No person shall, unless otherwise approved
by the EPA, discharge wastewater containing concentrations in excess
of the following:
Parameter
|
Limit
(mg/l)
|
---|
Aluminum
|
11.323
|
Arsenic
|
3.084
|
Cadmium
|
0.028
|
Copper
|
0.300
|
Cyanide
|
1.046
|
Lead
|
0.020
|
Mercury
|
0.002
|
Nickel
|
3.278
|
Silver
|
0.026
|
Zinc
|
0.553
|
The City reserves the right to establish, by ordinance or in
wastewater discharge permits, more stringent standards or requirements
on discharges to the POTW.
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 Director may impose mass limitations on users
which are using dilution to meet applicable pretreatment standards
or requirements or in other cases when the imposition of mass limitations
is appropriate.