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In compliance with this Section and Section 7.04.350, the District Engineer shall require preliminary treatment facilities to be provided by the connector, some of which are as follows:

A. Separators. All wastes, other than sewage from residential premises, which contain or are likely to contain oil or grease in excessive amounts, or any flammable substance, sand or other harmful ingredient, shall be passed through a suitable separator before discharge to a public sewer. The separator shall be of a type and capacity approved by the District Engineer and shall be so located as to be readily accessible for cleaning and inspection.

B. Screens. All wastes resulting from the wholesale processing of fruits, vegetables and other agricultural produce, including winemaking, shall be passed through suitable screens before discharge to a public sewer. The fine screen shall have openings of not more than one-thirty-second inch, unless otherwise permitted by the District Engineer. In addition, a coarse screen approved by the District Engineer shall be permanently fixed in the user’s discharge line. Such coarse screen shall only be removed by District personnel.

C. Standards for Grease Interceptors for Establishments with Food Service. Standards for Grease Interceptors for Establishments with Food Service. Such establishments shall include but not be limited to: restaurants of all types, hospitals, convalescent homes, and school cafeterias. The type of interceptor required shall be determined by the nature of the establishment where it will be used. Factors considered include type of food served, nature of waste discharged, operating hours, seating capacity, and type of appliances used. The size interceptor required shall be as determined by the District Engineer. Buildings remodeled for use requiring grease traps/interceptors shall be subject to the aforementioned regulations. Existing garbage grinders shall be removed at time of remodel. Abandoned interceptors shall be emptied and filled as required for abandoned septic tanks (see “Traps and Interceptors” in the California Plumbing Code).

1. Interior Cast Iron Grease Trap.

a. At the District Engineer’s discretion, the user may install a suitable grease trap inside the building served if the establishment does not have a garbage grinder or dishwasher and the grease waste generated is minimal. Size and specifications for cast iron type grease traps shall be as determined by the District Engineer.

b. Each appliance connected to a precast, under-sink type interceptor shall have a flow control device installed. No dishwasher may be connected to these types of interceptors. Under-sink interceptors must be cleaned monthly or more frequently as needed to meet the discharge limits. (See Section 7.04.350 regarding proof of cleaning requirements.)

2. Exterior Pre-Cast or Poured-in-Place Concrete Type Interceptors.

a. A concrete interceptor shall be installed by all other businesses with food service facilities where a grease trap is not adequate. The interceptor shall be located outside the building so that it is readily accessible for cleaning and inspection. Sizes and design specifications for concrete interceptors shall be as specified by the County design criteria or as determined by the District Engineer. All drains from the kitchen area shall be connected to the grease interceptor. No garbage grinder or garbage shredder shall be permitted to be installed. Garbage, fruit, vegetables, animal, or other solid kitchen

b. waste materials resulting from preparation of any food or drink by a commercial establishment shall be allowed to enter the sanitary sewers. All restrooms shall be plumbed separately and connected to the building sewer downstream of the grease interceptor.

c. Large interceptors must be maintained by the owner or operator at his/her own expense and pumped out, by a County-licensed liquid waste hauler, every three months or as often as needed to meet the discharge limit of fifty milligrams per liter of grease and oil. Maintenance shall require that the entire contents of an interceptor be pumped out. Decanting from interceptor pumpers to the sewer is prohibited. No such accumulated oil and grease shall be introduced into any drainage piping, public or private sewer. Industrial discharges, including restaurants, shall be responsible to show proof of legal disposal of their wastes. The District shall have the right to require inspection of the pumping procedures of a pumping company by requiring the pumper to arrange an appointment with the District prior to pumping any facility designated by the District. A record of grease trap/interceptor maintenance shall be maintained for a minimum of a twelve-month period and be made available for inspection and/or copies furnished upon request by the District. (See Section 7.04.350 regarding proof of cleaning requirements.)

d. Interceptors shall be installed in such a manner that storm water may not enter the device. (Ord. 139, 2019; Ord. 103 §6, 2002; Ord. 85 §4, 1995; Ord. 72 §1, 1991; Ord. 64 §2; Ord. 37 §2, 1983; Ord. 3 §5.7, 1973)