(A) Septic tanks. A septic tank used in an onsite wastewater treatment system shall meet the minimum standards for construction established in the Illinois Private Sewage Disposal Code and in this chapter.
(B) Aerobic treatment units. An aerobic treatment unit used in an onsite wastewater treatment system shall be listed and labeled by an ANSI accredited third party testing and certification organization as a Class I unit.
(C) Effluent filters. An effluent filter used in an onsite wastewater treatment system shall be designed for the specific purpose of filtering septic tank effluent and shall be designed and installed to be easily maintained.
(D) Exterior grease interceptor. When the Health Officer determines that the wastewater stream will contain significant quantities of fats, oil and grease (FOG) such as from food processing establishment, food service establishment licensed by the Lake County Health Department or other kitchen operations more intensive than residential, an exterior grease interceptor (EGI) designed as described in this section shall be installed.
(1) Wastewater segregation. The wastewater shall be segregated so that only wastewater from kitchen/food operations shall be discharged to the exterior grease interceptor. The EGI shall receive the entire waste discharge from kitchens or food processing areas.
(2) Capacity and sizing. The minimum capacity shall be 1,000 gallons or greater as calculated below:
(a) Restaurant. The minimum capacity of an exterior grease interceptor serving a restaurant shall be equal to C when:
C = S x H x A
S = number of seats (in lieu of, or in addition to seats, each drive-in car service space shall count as 3 seats, and each drive-up service window shall count as 60 seats)
H = hours per day that meals are served (minimum of 6 hours; maximum 12 hours)
A = Appliance factor: 0.75 for a kitchen with no dishwashing and no food waste grinder; 1.0 for a kitchen with either a dishwashing machine or a food waste grinder; 1.25 for a kitchen with both a dishwashing machine and a food waste grinder.
(b) Other food service. The minimum capacity of an exterior grease interceptor serving a dining hall, hospital, nursing home, school kitchen, church kitchen or a kitchen for carryout or delivery service shall be equal to C when:
C = (M x G x H)/2 x P
M = meals served per day
G = 3 gallons per meal served
H = hours per day that meals are served at least 6 hours but not more than 12 hours
P = meal periods per day, 1, 2 or 3.
(3) Tank design specifications. The exterior grease interceptor shall meet the construction standards of a septic tank as established in the Illinois Department of Public Health Private Sewage Disposal Code, § 905.40, and shall be modified as follows:
(a) Inlet/outlet. The inlet and outlet openings shall be provided with open-end sanitary tee fittings or baffles, designed and constructed to distribute the flow and retain the grease in the tank or tank compartments. The sanitary tee fitting or baffle at the inlet opening shall extend below the liquid level of the tank a distance equal to one-third of the total liquid depth. The sanitary tee fitting or baffle at the outlet opening shall extend below the liquid level of the tank a distance equal to two-thirds of the total liquid depth.
(b) Orientation. The longest dimension of the tank shall be set parallel to the direction of flow.
(c) Openings. Only watertight openings shall be used for the inlet and outlet piping.
(d) Setbacks. The setback distances in Appendix D shall apply to the placement of an exterior grease interceptor.
(e) Effluent flow. The effluent from an exterior grease interceptor shall be merged with the remaining flow from the facility at a point after primary treatment of that flow and before any additional treatment.
(4) Inspections and pumping. The owner of an exterior grease interceptor shall assure that the exterior grease interceptor is inspected and pumped as necessary to ensure its proper function.
(E) Media filters. If used, proprietary media filters shall be used in accordance with manufacturer’s applications.
(Ord. [Bd of Health Ord., Art. V], passed 11-12-1996; Ord. [Bd of Health Ord., Art. V], passed 11-12-2013)