(A) Grease interceptors shall be designed and constructed in accordance with the provisions of the FOG policy and in accordance with the most current edition of the town’s sanitary sewer design and construction standards.
(B) Design and construction shall be approved by the Wastewater Treatment Facilities Superintendent, the Superintendent’s representative or the utility’s authorized engineering representative.
(C) The establishment shall obtain the services of a design professional to prepare site layout, size the grease interceptor and prepare a plan detailing connection to the utility’s sanitary sewer.
(D) The discharge from the following fixtures shall be directed to the grease interceptor: all sinks, dishwashers, floor drains in food preparation and storage areas, food waste grinders and any other fixtures through which grease may be discharged.
(E) Grease interceptors shall be installed on the customer’s property and in a location outside of the customer’s establishment, which provides access for inspection, cleaning and maintenance, including pumping.
(F) Wastewater from sanitary establishments shall not be introduced into the grease interceptor under any circumstances.
(G) Grease interceptors are to be installed at a minimum distance of ten feet from sinks and dishwashers to allow for adequate cooling of wastewater. The influent to interceptors shall not exceed 140°F. The temperature at the flow control device inspection port shall be considered equivalent to the temperature of the influent.
(H) Where food-waste grinders are installed the grease interceptor size shall be increased by 30% of the sizing requirement.
(I) Drains that receive “clear waste” only, such as from ice machines, condensate from coils and drink stations, may be plumbed to the sanitary system without passing through the grease interceptor.
(J) All waste shall only enter the grease through the inlet flow control device.
(K) Grease interceptors shall conform to the following criteria when being designed and constructed:
(1) The interceptor’s tank size may be based on design criteria set forth by Bulletin S.E. 13 from the Indiana State Department of Health, latest edition, and as indicated in Appendix A of the FOG policy.
(2) Typical detail is shown on Figure A2.4 in Appendix A of the FOG policy. New in-ground grease interceptors shall be no less than 1,000 gallons total capacity. The maximum capacity of any grease interceptor shall be 1,500 gallons unless advised otherwise by the utility’s authorized engineering representative. Where sufficient capacity cannot be achieved with a single interceptor, installation of multiple grease interceptors in series shall be required.
(3) Grease interceptors must meet a minimum structural design of 150 pounds per square foot for non-traffic installations. For vehicular traffic conditions the grease interceptor shall be designed to withstand H-20 wheel loads.
(4) Grease interceptors shall meet the following standards: ASTM C-1227 (Septic Tanks), C-913 (Pre-cast Concrete Water and Wastewater Structures), ACI-318 (Design) and ASTM C-890 (for establishing Minimum Structural Design Loading).
(5) A licensed design professional will specifically design cast in place grease interceptors.
(6) Prior to installation, the contractor shall submit a shop drawing of the grease interceptor for approval to the Town’s Utility Office, 23 West Jennings Street, Newburgh, IN 47630. The shop drawing shall list “Grease Interceptor for (insert the actual project name here)” as the heading of the drawing. The utility reserves the right to waive the shop drawing requirement.
(7) A utility inspector shall inspect the grease interceptor prior to installation. Contractor shall call (812) 853-7496 24 hours prior to installation.
(8) The grease trap must also be inspected by the utility and approved during installation, prior to backfilling. Contractor shall call (812) 853-7496 24 hours prior to installation.
(9) The utility will not approve a grease interceptor that has not been inspected.
(L) In approving an establishment’s grease interceptor design, the utility does not accept liability for the failure of a system to adequately treat wastewater to achieve effluent quality requirements specified under this policy. It is the responsibility of the establishment to ensure the appropriate level of treatment necessary for compliance with the FOG policy and applicable regulations.
(M) All new commercial buildings, such as malls, strip centers and the like, containing sections designated for commercial enterprise, shall provide a stub-out for a separate waste line for future grease interceptor installation. The designer of such new structures shall consider suitable physical property space and sewer gradient that will be conducive for the installation of an exterior grease interceptor(s) for any flex space contained within the building. Physical property restrictions and sewer gradient shall not be a basis for a waiver to install a grease interceptor after the effective date of this policy.
(Ord. 2012-20, passed 8-22-2012)