§ 52.063 LICENSED CONTRACTOR TO MAKE CONNECTIONS.

   No person shall make a sanitary sewer service connection with any public sanitary sewer unless they have completed pipe laying training as prescribed by the Commissioner of Labor and Industry and provide documentation of such training or are a bonded, licensed plumber as required by M.S. § 326B.46 as may be amended from time to time.

(Ord. 297, passed 3-1-2022)

§ 52.064 INDIVIDUAL CONNECTIONS TO CITY SANITARY SEWER SYSTEM.

   (A)   Definition. For the purposes of this section, the term COMBINED CONNECTION means a single connection to the municipal sanitary sewer system that serves:

      (1)   Two or more residential units; or

      (2)   Two or more commercial or industrial lots or separate parcels of record.

   (B)   Combined connection after effective date. Unless permitted for a hardship situation in accordance with division (E), no combined connection may be made after the effective date of this section.

   (C)   Combined connections discontinued. Unless permitted to continue for a hardship situation in accordance with division (E), combined connections in existence on the effective date of this section shall be discontinued and replaced with individual connections in accordance with this section.

      (1)   Owners of properties using a combined connection must replace such connection with an individual connection within three years of the date of notice from the city that replacement is required.

      (2)   Owners of the properties using a combined connection may use those parts of the connection lying within their property or in the public right-of-way between their property and the public sanitary sewer pipe, but must otherwise disconnect from the common connection and construct a new individual connection.

   (D)   Exceptions. The requirements of division (C) do not apply to:

      (1)   Multi-family residential rental properties where all units served by a combined connection are under the same ownership; or

      (2)   Multiple industrial or commercial lots or parcels of land that are adjacent, under the same ownership, and used for a single, unified business enterprise; or

      (3)   Combined connections where there is not an individual service from the main to the edge of the right-of-way available for each property using the combined connection.

   (E)   Variances. The Council may grant variances from the requirements of division (C) upon a finding that there are unique or unusual physical constraints on constructing an individual connection that make such connection impractical from an engineering perspective.

   (F)   Notice. Notice to owners provided for in this section shall be by certified mail to the person or persons whom tax statements are to be sent according to the records of Isanti County.

   (G)   Penalties. Any person convicted of a violation of this section shall be guilty of a misdemeanor. Violation of this section is also grounds for termination of sanitary sewer or water service and the imposition of such penalties or charges as may be imposed by Council resolution.

(Ord. 297, passed 3-1-2022)

USE OF PUBLIC SANITARY SEWERS

§ 52.070 PROHIBITED DISCHARGES.

   (A)   No person(s) shall discharge or cause to be discharged any unpolluted water such as storm water, groundwater, roof runoff, surface drainage or noncontact cooling water to any sanitary sewer.

   (B)   Storm water and all other unpolluted drainage shall be discharged to such storm sewers as are specifically designed as storm sewers or to a natural outlet approved by the city and other regulatory agencies. Industrial cooling water or unpolluted process waters may be discharged to a storm sewer or natural outlet on approval of the city and upon approval and the issuance of a discharge permit by the MPCA.

   (C)   No person(s) shall discharge or cause to be discharged any of the following described waters or wastes to any public sanitary sewers:

      (1)   Any liquids, solids, or gases which by reason of their nature or quantity are, or may be, sufficient either alone or by interaction with other substances to cause fire or explosion or be injurious in any other way to the wastewater disposal system or to the operation of the system. Prohibited materials include but are not limited to gasoline, kerosene, naphtha, benzene, toluene, xylene, ethers, alcohols, ketones, aldehydes, peroxides, chlorates, perchlorates, bromates, carbides, hydrides and sulfides;

      (2)   Solid or viscous substances which will cause obstruction to the flow in a sanitary sewer or other interference with the operation of the wastewater treatment facilities, such as, but not limited to grease, garbage with particles greater than one half inch in any dimension, animal guts or tissues, paunch manure, bones, hair, hides or fleshings, entrails, whole blood, feathers, ashes, cinders, sand, spent lime, stone or marble dust, metal, glass, straw, shavings, grass clippings, rags, spent grains, spent hops, waste paper, wood, plastic, asphalt residues, residues from refining or processing of fuel or lubricating oil, mud or glass grinding or polishing wastes;

      (3)   Any wastewater having a pH of less than 5.0 or greater than 9.5 or having any other corrosive property capable of causing damage or hazard to structures, equipment and personnel of the wastewater disposal system; and

      (4)   Any wastewater containing toxic pollutants in sufficient quantity, either singly or by interaction with other pollutants, to inhibit or disrupt any wastewater treatment process, constitute a hazard to humans or animals or create a toxic effect in the receiving waters of the wastewater disposal system. A toxic pollutant shall include but not be limited to any pollutant identified pursuant to § 307(a) of the Act.

(Ord. 297, passed 3-1-2022)

§ 52.071 LIMITED DISCHARGES.

   (A)   (1)   The following described substances, materials, water, or wastes shall be limited in discharges to city systems to concentrations or quantities which will not harm either the sanitary sewers, the wastewater treatment works treatment process or equipment, will not have an adverse effect on the receiving stream and/or soil, vegetation and groundwater or will not otherwise endanger lives, limb, public property or constitute a nuisance.

      (2)   The Director may set limitations lower than limitations established in the regulations below if, in his or her opinion, such more severe limitations are necessary to meet the above objectives. In forming his or her opinion as to the acceptability of wastes, the Director will give consideration to such factors as the quantity of subject waste in reaction to flows and velocities in the sanitary sewers, materials of construction of the sanitary sewers, nature of the sewage treatment process, the city's NPDES and/or SDS permit, capacity of the sewage treatment plant, degree of treatability of wastes in the sewage treatment plant and other pertinent factors. The limitations or restrictions on materials or characteristics of waste or wastewaters discharged to the sanitary sewer which stall not be violated without approval of the Director are as follows:

         (a)   Any wastewater having a temperature greater than 150 degrees F (65.6 degrees C) or causing, individually or in combination with other wastewater, the influent at the wastewater treatment plant to have a temperature exceeding 104 degrees F (40 degrees C) or having heat in amounts which will inhibit biological activity in the wastewater treatment works resulting in interference therein;

         (b)   Any wastewater containing fats, wax, grease or oils, whether emulsified or not, in excess of 100 mg/l or containing substances which may solidify or become viscous at temperatures between 32 degrees F and 150 degrees F (0 degrees C and 65.6 degrees C) and any wastewater containing oil and grease concentrations of mineral origin of greater than 100 mg/l, whether emulsified or not;

         (c)   Any quantities of flow, concentrations or both which constitute a "slug" as defined in § 52.002;

         (d)   Any garbage not properly shredded, as defined in § 52.002. Garbage grinders may be connected to sanitary sewers from homes, hotels, institutions, restaurants, hospitals, catering establishments or similar places where garbage originates from the preparation of food on the premises or when served by caterers;

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

         (f)   Any wastewater with objectionable color not removed in the treatment process, such as but not limited to dye wastes and vegetable tanning solutions;

         (g)   Noncontact cooling water or unpolluted storm water, storm drainage or groundwater;

         (h)   Wastewater containing inert suspended solids (such as but not limited to, Fullers earth, lime slurries and lime residues) or of dissolved solids (such as but not limited to, sodium chloride and sodium sulfate) in such quantities that would cause disruption with the wastewater disposal system;

         (i)   Any radioactive wastes or isotopes of such half-life or concentration as may exceed limits established by the Director in compliance with applicable state or federal regulations;

         (j)   Any waters or wastes containing the following substances to such degree that any such material received in the composite wastewater at the wastewater treatment works in excess of limitations set by the Director for such materials: arsenic; cadmium; copper; cyanide; lead; mercury; nickel; silver; total chromium; zinc; and phenolic compounds which cannot be removed by city's wastewater treatment system; and

         (k)   Any wastewater which creates conditions at or near the wastewater disposal system which violates any statute, rule, regulation or ordinance of any regulatory agency or state or federal regulatory body.

         (l)   Any waters or wastes containing BOD5 or suspended solids of such character and quantity that unusual attention or expense is required to handle such materials at the wastewater treatment works, except as may be permitted by specific written agreement subject to the provisions of § 52.079.

   (B)   (1)   If any waters or wastes are discharged or are proposed to be discharged to the public sanitary sewers which contain substances or possess the characteristics enumerated in division (A) of this section and/or which in the judgement of the Director may have a deleterious effect upon the wastewater treatment facilities, processes or equipment, receiving waters and/or soil, vegetation and groundwater or which otherwise create a hazard to life or constitute a public nuisance, the city may:

         (a)   Reject the wastes;

         (b)   Require pretreatment to an acceptable condition for discharge to the public sanitary sewers, pursuant to § 307(b) of the Act and all addendums thereof;

         (c)   Require control over the quantities and rates of discharge; and/or

         (d)   Require payment to cover the added costs of handling, treating and disposing of wastes not covered by existing taxes or sanitary sewer service charges.

      (2)   If the city permits the pretreatment or equalization of waste flows, the design, installation and maintenance of the facilities and equipment shall be made at the owner's expense and shall be subject to the review and approval of the city pursuant to the requirements of the MPCA.

(Ord. 297, passed 3-1-2022)

§ 52.072 COMPLIANCE.

   No user shall increase the use of process water or in any manner attempt to dilute a discharge as a partial or complete substitute for adequate treatment to achieve compliance with the limitations contained in §§ 52.070 and 52.071 or contained in the National Categorical Pretreatment Standards or any state requirements.

(Ord. 297, passed 3-1-2022)

§ 52.073 PRETREATMENT FACILITIES.

   Where pretreatment or flow-equalizing facilities are provided or required for any waters or wastes, they shall be maintained continuously in satisfactory and effective operation at the expense of the owner(s).

(Ord. 297, passed 3-1-2022)

§ 52.074 GREASE, OIL AND SAND INTERCEPTORS.

   Grease, oil, and sand interceptors shall be provided when, in the opinion of the Director, they are necessary for the proper handling of liquid wastes containing floatable grease in excessive amounts, as specified in § 52.071(A), any flammable wastes as specified in § 52.070(C), sand or other harmful ingredients, except that such interceptors shall not be required for private living quarters or dwelling units. All interceptors shall be of the type to be readily and easily accessible for cleaning and inspection. In the maintaining of these interceptors, the owner(s) shall be responsible for the proper removal and disposal of the captured materials by appropriate means and shall maintain a record of dates and means of disposal which are subject to review by the Director. Any removal and hauling of the collected materials not performed by the owner's personnel must be performed by a currently licensed waste disposal firm.

(Ord. 297, passed 3-1-2022)