Morro Bay Municipal Code Art. III Pretreatment of Wastewater

Users shall provide wastewater treatment as necessary to comply with this chapter and shall achieve compliance with all categorical Pretreatment Standards, Local Limits, and the prohibitions set out in Section 13.12.200 of this chapter within the time limitations specified by EPA, the state, or the utilities division/department manager, whichever is more stringent. Any facilities necessary for compliance shall be provided, operated, and maintained at the user's expense. Detailed plans describing such facilities and operating procedures shall be submitted to the utilities division/department manager for review, and shall be acceptable to the utilities division/department manager before such facilities are constructed. The review of such plans and operating procedures shall in no way relieve the user from the responsibility of modifying such facilities as necessary to produce a discharge acceptable to the city under the provisions of this chapter.

A. The admission into the public sewers of any waters or wastes having characteristics exceeding the narrative limits established in Section 13.12.200 of this chapter shall be subject to the review and approval by the utilities division/department manager.

B. Where necessary in the opinion of the utilities division/department manager, the owner shall provide, at his expense, such preliminary treatment as may be necessary to:

1. Reduce the biochemical oxygen demand to three hundred mg/L and the suspended solids to three hundred fifty mg/L; or

2. Reduce objectionable characteristics or constituents to within the maximum limits provided for in Section 13.12.200 of this chapter; or

3. Control the quantities and rates of discharge of such waters or wastes. Plans, specifications, and any other pertinent information relating to proposed preliminary treatment facilities shall be submitted for the approval of the utilities division/department manager and of the water pollution control board of the state, and no construction of such facilities shall be commenced until said approvals are obtained in writing.

C. Where preliminary treatment facilities are provided for any wastewater, they shall be maintained continuously in satisfactory and effective operation, by the owner at his expense.

(Ord. No. 642, § 1, 1-26-21)

A. Whenever deemed necessary, the utilities division/department manager may require 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 wastestreams from industrial wastestreams, and such other conditions as may be necessary to protect the POTW and determine the user's compliance with the requirements of this chapter.

B. The utilities division/department manager may require any person discharging into the POTW to install and maintain, on their property and at their expense, a suitable storage and flow-control facility to ensure equalization of flow. An industrial wastewater discharge permit may be issued solely for flow equalization.

C. Users with the potential to discharge flammable substances may be required to install and maintain an approved combustible gas detection meter.

(Ord. No. 642, § 1, 1-26-21)

When required by the utilities division/department manager, the owner of any property served by a building sewer carrying industrial wastes shall install a suitable control utility hole in the building sewer to facilitate observation, sampling and measurements of the wastes. Such utility hole, when required, shall be accessible and safely located, and shall be constructed in accordance with plans approved by the utilities division/department manager. The utility hole shall be installed by the owner at his expense, and shall be maintained by him so as to be safe and accessible at all times.

(Ord. No. 642, § 1, 1-26-21)

A. Grease, oil and sand interceptors shall be provided when, in the opinion of the utilities division/department manager, they are necessary for the proper handling of liquid wastes containing grease in excessive amounts, or any flammable wastes, sand, and other harmful ingredients; except that such interceptors shall not be required for private living quarters or dwelling units. All interceptors shall be of a type and capacity approved by the utilities division/department manager, and shall be located as to be readily and easily accessible for cleaning and inspection.

B. Grease and oil interceptors shall be constructed of impervious materials capable of withstanding abrupt and extreme changes in temperature. They shall be of substantial construction, watertight, and equipped with easily removable covers which, when bolted in place, shall be gastight and watertight.

C. Where installed, all grease, oil and sand interceptors shall be maintained by the owner, at his expense, in continuously efficient operation at all times.

D. Wastewater discharge permits may be issued to users of grease, oil, and sand interceptors. Permits shall establish minimum requirements for the design, maintenance and performance of the equipment. Permits may include other information as described in Article VII of this chapter.

E. The discharge of waste to a grease, oil, and sand interceptor is subject to all sections of this chapter.

F. Purchase and installation of the interceptor shall be at the user's expense. No exceptions shall be made to the requirements of this section due to expense, size of the installation or difficulties in locating the interceptor within the site boundary.

(Ord. No. 642, § 1, 1-26-21)

The utilities division/department manager shall evaluate whether each SIU needs an accidental discharge/slug discharge control plan or other action to control slug discharges. The utilities division/department manager may require any user to develop, submit for approval, and implement such a plan or take such other action that may be necessary to control slug discharges. Alternatively, the utilities division/department manager may develop such a plan for any user. An accidental discharge/slug discharge control plan shall address, at a minimum, the following:

A. Description of discharge practices, including nonroutine batch discharges;

B. Description of stored chemicals;

C. Procedures for immediately notifying the utilities division/department manager of any accidental or slug discharge, as required by Section 13.12.630 of this chapter; and

D. 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.

(Ord. No. 642, § 1, 1-26-21)