§ 40-687. Limitations on discharge characteristics.

(a)

Limitations related to treatment plant influent. Discharge to the utility sewerage system of the following described substances, materials, waters or waste shall be limited to the following concentrations or quantities, provided such concentrations or quantities will not harm the utility or MMSD sewers, wastewater treatment process or equipment; will not have an adverse effect on the receiving stream; will not have an adverse effect on the MMSD sludge management program; will not endanger persons or property; will not cause air pollution or other detrimental environmental effects; and will not constitute a nuisance:

(1)

Liquid having a temperature higher than 65 degrees Celsius (149 degrees Fahrenheit) or any wastewater having a temperature which will inhibit biological activity in the utility treatment plant, thereby resulting in interference. Notwithstanding the foregoing, in no case shall wastewater be discharged having a temperature that causes the to the utility treatment plant to exceed 40 degrees Celsius (104 degrees Fahrenheit), unless the MMSD director certifies that the treatment plant is designed to accommodate such temperature;

(2)

Wax, grease, oil, plastic or any other substance that solidifies or becomes discernibly viscous;

(3)

Radioactive wastes which, alone or with other wastes, result in releases greater than those specified by current United States Bureau of Standards Handbooks, or which violate rules or regulations of any applicable regulatory agency;

(4)

Wastewater containing more than 50 milligrams per liter of petroleum oil, nonbiodegradable cutting oils, or products of mineral oil origin;

(5)

Wastewater containing more than 300 mg/l of oil or grease of animal or vegetable origin;

(6)

Wastewater which in concentration of any given constituent or in quantity of flow exceeds for any period of duration longer than 15 minutes more than five times the average 24-hour concentration or flows during normal operation;

(7)

Wastewater which contains in excess of any of the following constituents in a 24-hour flow proportionate sample made up of an aggregate of the total discharge from all of the outfalls of the industrial user:

a.

0.25 mg/l cadmium;

b.

0.5 mg/l hexavalent chromium;

c.

10.0 mg/l total chromium;

d.

10.5 mg/l copper;

e.

5.0 mg/lead;

f.

0.02 mg/l mercury;

g.

0.3 mg/l selenium;

h.

3.0 mg/l silver;

i.

8.0 mg/l zinc;

j.

2.0 mg/l nickel;

k.

0.1 mg/l cyanide.

Samples shall be collected over the period of discharge if the discharge is less than 24 hours in duration.

(8)

Industrial discharges exceeding applicable national categorical pretreatment standards, or state standards;

(9)

Any substance with objectionable color not removed in the treatment process, such as, but not limited to, dye wastes and vegetable tanning solution;

(10)

Any noxious or malodorous liquids, gases, or solids which either singly or by interaction are capable of creating a public nuisance or hazard to life or are sufficient to prevent entry into the sewers for their maintenance and repair; or

(11)

Any discharge prohibited or limited by the MMSD by alteration, amendment or modification of the limitations established in section 5.2.1 of the MMSD ordinance determined by the board to be necessary to meet the objectives of this article or the conditions of the MMSD's WPDES permit.

(b)

Discharge into utility sewerage system prohibited. No person shall cause or permit a discharge into the utility sewerage system that would cause, or significantly contribute to, either directly or indirectly, a violation of the conditions of the MMSD's WPDES permit and any modification or re-issuance thereof.

(c)

Limitations superceded. Upon promulgation of National Categorical Pretreatment Standards for a particular industrial user subcategory, the federal standards (if more stringent than the limitations imposed under this article) shall immediately supersede the limitations imposed under this article; and such industrial user shall comply with the said federal standards upon notification by MMSD of the applicable requirements under 40 CFR 403.12.

(Comp. Ords. 2009, § 9.05(4))