(A) Definitions. For the purpose of this subchapter, the following definitions shall apply unless the context clearly indicates or requires a different meaning.
COMMERCIAL USERS. Any user other than single-family user and two-family residential users of the Ocean Acres Sewer System located in the Southern Sanitary District.
GREASE TRAPS. Devices used to remove excessive amounts of grease that may interfere with wastewater treatment, restrict flows in collection mains or clog inlet or outlet structures.
RESIDENTIAL USERS. Single-family and two-family users of the Ocean Acres Sewer System located in the Southern Sanitary District.
(B) Design.
(1) Commercial users that discharge large volumes of kitchen wastewater shall have installed on their premises a grease trap facility or device based upon the following use requirements.
1 to 60 seats | = | minimum of a 1,000 gallon grease trap |
61 to 120 seats | = | minimum of a 1,500 gallon grease trap |
121 to 180 seats | = | minimum of a 2,000 gallon grease trap |
181 to 240 seats | = | minimum of a 2,500 gallon grease trap |
(2) Grease trap tank size shall increase 500 gallons for every 60 seats added to the above formula.
(C) Construction features.
(1) Grease traps are generally made of precast concrete and are purchased completely assembled. However, very large units may be field-constructed. Grease traps come in single- and double-compartment versions.
(2) Grease traps are usually buried so as to intercept the building sewer. They must be level, located where they are easily accessible for cleaning and close to the wastewater source. Where efficient removal of grease is very important, an improved two-chamber trap has been used which has a primary (or grease-separating) chamber and a secondary (or grease-storage) chamber. By placing the trap as close as possible to the source of wastewaters, where the wastewaters are still hot, the separating grease at the surface of the first chamber can be removed by means of an adjustable weir and conveyed to the separate secondary chamber, where it accumulates, cools and solidifies. This decreases the requirement for cleaning and allows better grease separation in the first chamber.
(3) The inlet, outlet and baffle fittings are typically of "T" design with a vertical extension 12 inches (30 cm) from the tank floor and reaching well above the water line. To allow for proper maintenance, manholes to finished grade should be provided. The manhole covers should be of gas-tight construction and should be designed to withstand expected loads.
(D) Operation and maintenance. Each commercial user shall submit to the town a schedule of the proposed frequency of having the grease trap pumped out. This schedule shall be reviewed by the Wastewater Operator of the Public Services Department for acceptability, approval of which will be authorized or denied. Once an acceptable level of frequency is approved, Public Services Department contracted services staff shall inspect commercial users at least bimonthly while in operation, and more frequently if necessary, to determine compliance with this subchapter. A report shall be filed in the Public Services Department on their findings.
(Ord. passed - -; Am. Ord. 16-17, passed 6-11-18)