Rio Dell Municipal Code Art. VI Pretreatment Of Wastewaters

Domestic sewage consisting essentially of human waste may be passed into the sewers without screening. Industrial waste must be examined prior to discharge into the City sewer system by the City Manager or designee and, if he deems it necessary, such wastes must be given preliminary treatment and be screened prior to their discharge into the City sewer system. The type of treatment and screening shall be subject to the City Manager's or designee's sole discretion.

No person shall suffer or permit any premises belonging to or occupied by or under his control, any cellar, vault, cesspool, privy, sewer or private drain thereon, to become foul or offensive and detrimental to the health or public comfort.

(Ord. 286, 2012; Ord. 322 § 1, 2014)

Industrial users shall provide necessary wastewater treatment as required to comply with this chapter and shall achieve compliance with all categorical pretreatment standards, local limits and the prohibitions set out in this chapter within the time limitations specified by the EPA, the State, or the City Manager or designee, whichever is more stringent. Any facilities required to pretreat wastewater to a level acceptable to the City shall be provided, operated, and maintained at the industrial user's expense. Detailed plans showing the pretreatment facilities and operating procedure shall be submitted to the City for review, and must be approved by the City before construction of the facility. The review of such plans and operating procedures will in no way relieve the industrial user from the responsibility of modifying the facility as necessary to produce an acceptable discharge to the City under the provisions of this chapter.

(Ord. 286, 2012; Ord. 322 § 1, 2014)

(1) Whenever deemed necessary, the City Manager or designee may require industrial users to restrict their discharge during peak flow periods, designate that certain wastewater be discharged only into specific sewers, relocate and/or consolidate points of discharge, separate sewage waste streams from industrial waste streams, and such other conditions as may be necessary to protect the POTW and determine the industrial user's compliance with the requirements of this chapter.

(2) Each person discharging into the POTW greater than 100,000 gallons per day shall install and maintain, on his property and at his expense, a suitable storage and flow control facility to ensure equalization of flow over a 24-hour period.

(3) Industrial users with the potential to discharge flammable substances may be required to install and maintain an approved combustible gas detection meter.

(4) At no time shall any reading on a properly calibrated combustible gas detector at the point of discharge into the POTW, or at any point in the POTW, be more than 20 percent of the lower explosive limit (LEL) of the meter.

(Ord. 286, 2012; Ord. 322 § 1, 2014)

The City Manager or designee may require any industrial user to develop and implement an accidental discharge/slug control plan. At least once every two years the City Manager or designee shall evaluate whether each significant industrial user needs such a plan. Any industrial user required to develop and implement an accidental discharge/slug control plan shall submit a plan which provides, at a minimum, the following:

(1) Description of discharge practices including nonroutine batch discharges.

(2) Description of stored chemicals.

(3) Procedures for immediately notifying the POTW of any accidental or slug discharge. Such notification must also be given for any discharge which would violate any of the prohibited discharges in RDMC § 13.10.410 and § 13.10.420.

(4) Procedures to prevent adverse impact from any accidental or slug discharge. Such procedures include, but are not limited to, inspection and maintenance of storage areas, handling and transfer of materials, loading and unloading operations, control of plant site runoff, worker training, building of containment structures or equipment, measures for containing toxic organic pollutants (including solvents), and/or measures and equipment for emergency response.

(5) Procedures for immediately notifying the POTW of any changes affecting the potential for a sludge discharge.

(Ord. 286, 2012; Ord. 322 § 1, 2014)

Where an owner of property lets premises to any other person as a tenant, if either the owner or the tenant is an industrial user, either or both may be held responsible for compliance with the provisions of this chapter. This provision is enforceable against either the owner, tenant or both, without regard to any contractual arrangements as between the owner and tenant.

(Ord. 286, 2012; Ord. 322 § 1, 2014)

(1) Septic tank waste of residential origin may be accepted into the POTW at a designated receiving structure within the treatment plant area, and at such times as are established by the City Manager or designee, provided such wastes do not violate the provisions of this chapter or any other requirements established or adopted by the City. Wastewater discharge permits for individual vehicles to use such facilities shall be issued by and at the discretion of the City Manager or designee, based on the interests and purposes to be served under this chapter.

(2) The discharge of hauled industrial wastes is prohibited without prior approval and a wastewater discharge permit from the City.

(3) Fees for dumping septage will be established as part of the industrial user fee system as authorized in this chapter.

(Ord. 286, 2012; Ord. 322 § 1, 2014)

The national categorical pretreatment standards found at 40 CFR, Chapter I, Subchapter N, Parts 405 through 471 are hereby incorporated.

(Ord. 286, 2012; Ord. 322 § 1, 2014)

Grease, oil and sand interceptors shall be provided when, in the opinion of the City Manager or designee, they are necessary for the proper handling of wastewater containing excessive amounts of grease and oil, or sand; except that such interceptors shall not be required for residential users. All interception units shall be of type and capacity approved by the City Manager or designee and shall be so located to be easily accessible for cleaning and inspection. All interception units shall be installed in accordance with the provisions of this chapter. Such interceptors shall be inspected, cleaned, and repaired regularly, as needed, by the owner at their sole expense. New and existing users that are determined by the City Manager or designee to have a reasonable potential to adversely impact the POTW shall install a grease interceptor.

(1) Users that are required to have a grease interceptor may be required to connect fixtures or drains that have a reasonable potential to allow fats, oils, and grease to be discharged to the POTW to an appropriately sized grease interceptor.

(2) Users with garbage grinders shall discharge the garbage grinder to a grease interceptor with a minimum capacity of 1,000 gallons or remove the garbage grinder.

(3) Users with dishwashers shall discharge the dishwasher directly to the POTW or to a grease interceptor with a minimum capacity of 750 gallons.

(4) Accumulated grease and sediment shall be removed as required. At a minimum gravity grease interceptors and grease traps shall be cleaned when the combined depth of sediment and grease equals or exceeds 25 percent of the total depth of the sediment, water, and grease. For multiple chambered interceptors the measurement of sediment and grease is to be performed in the final interceptor chamber prior to discharge. All other grease interceptors shall be maintained in accordance with the manufacturer's specifications.

(5) Grease interceptors shall be kept free of nonfood waste including but not limited to grit, rocks, gravel, sand, eating utensils, cigarettes, trash, towels, and rags.

(6) The addition of chemicals, enzymes, emulsifiers, live bacteria or other grease cutters or additives used for purposes of grease reduction to a grease interceptor is specifically prohibited.

(7) If the City Manager or designee determines that a grease interceptor is not being adequately cleaned or maintained, a correction notice may be issued requiring the deficiency be corrected within seven working days. Maintenance programs including BMPs and defined cleaning frequencies may be mandated. Users that fail to adhere to a maintenance program may be required to install additional pretreatment devices.

(8) The City will develop and implement a fats, oils, and grease policy.

(9) Inspections and Sampling. The City Manager or any person designated by the City Manager may inspect the facilities of any user of the City of Rio Dell sanitary sewer system, or any facilities in any way or manner connected to the City of Rio Dell sanitary sewer system, to ascertain whether the purpose of this chapter is being met and all requirements are being complied with. Persons or occupants of the premises where sewage or wastewater is created or discharged shall allow the City Manager or his designee ready access at all reasonable times and at all parts of the premises for the purposes of inspections or sampling, or in the performance of any of their duties. The City of Rio Dell shall have the right to set up on user's property such devices as are necessary to conduct sampling and metering operations. The refusal of reasonable access to the user's premises for inspection purposes or monitoring purposes of sanitary sewer system-related matters shall be grounds for immediate suspension of the Rio Dell sanitary sewer system service to the person refusing reasonable access to the user's premises, including immediate severance of the sewer connection as set forth in RDMC § 13.10.460(7).

(10) Interceptors – Maintenance. All grease, oil and sand interceptors shall be maintained by the owner, at his expense, in continuously efficient operation at all times.

(Formerly 13.10.430 – 13.10.450; Ord. 190 §§ 49, 50, 51, 1987; Ord. 203, 1990; Ord. 286, 2012; Ord. 322 § 1, 2014)

All commercial facilities and food establishments that are required to have a sand and/or grease interceptor or grease trap according to RDMC § 13.10.432 shall be required to install a sand and/or grease interceptor or grease trap within the 60-day period after the first occurrence of any of the following events:

(1) Transfer of any ownership or interest in the commercial facility;

(2) The issuance by the County of any building permit for the construction, reconstruction or related work to be performed on the premises costing more than $5,000;

(3) The backup or discharge of raw sewage on or from the premises due to grease buildup in their service lateral; or

(4) Ninety days after receiving written notice from the City Manager or designee of the necessity for installation of such facilities.

(Ord. 286, 2012; Ord. 322 § 1, 2014)

All establishments having a grease trap or interceptor shall maintain and clean this unit as recommended by the manufacturer. Each grease trap or interceptor shall be regularly maintained by the proprietor or property owner and records kept at the site for inspection by the City. Maintenance will vary depending upon the size of the unit and grease loading. The property owner or proprietor shall send a copy of the maintenance records to the City annually from the time of installation or some other agreed upon date by the City. At no time shall the unit be allowed to become clogged with grease so as to create damage to the City collection or treatment facilities. The proprietor must develop a cleaning schedule sufficient to keep the unit functioning properly. Records of grease disposal to a collection agent must be made available to City personnel upon request.

(Ord. 286, 2012; Ord. 322 § 1, 2014)