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Oil and Grease Interceptor Maintenance Procedure

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					City of xxx Industrial Pretreatment Program Oil and Grease Interceptor Policy & Procedure
For the Service Area of the City of xxx Wastewater Reclamation Facility 1.0 GREASE INTERCEPTOR DEFINITION A grease interceptor is a device designed and installed to separate and retain grease and other related undesirable matter from normal wastes and permit normal sewage or liquid wastes to discharge into a wastewater collection system by gravity. Interceptors differ from fixture traps in that, in addition to preventing the back passage of gases from drainage systems into a building, they also protect the drainage and wastewater collection systems from substances that might plug, block or otherwise be harmful to those systems. 1.1 GREASE INTERCEPTOR INSTALATION REQUIREMENT CRITERIA

Grease Interceptors are required for all facilities used and operated regularly for the sale of prepared food. Businesses requiring grease interceptors include but are not limited to restaurants, cafes, fast food outlets, pizza outlets, delicatessens, sandwich shops, and any and all other kinds and types of food vending establishments in which any food preparation (including heating or defrosting in or by means of any kind of oven or heating device) takes place on the premises, whether or not such facilities are located in a separate building or structure or occupy space in a building or structure that is occupied by other businesses, as well as schools, churches, boarding houses with communal kitchen facilities, nursing homes, and day care centers which have kitchens and engage in the preparation of food. In addition, meat cutting facilities and others capable of discharging significant amounts of grease into the City of xxx wastewater collection system shall be required to install grease interceptors. The exception shall be those facilities granted a variance, after review from the Wastewater Division Superintendent and approved by the Industrial Pretreatment Coordinator. Grease interceptors shall not be required for private residences or dwellings. 1.2 GREASE INTERCEPTOR DESIGN CRITERIA

All cities and sanitation districts discharging to the City of xxx Wastewater Reclamation Facility shall adopt, at a minimum, the City of xxx’s procedure for grease interceptor sizing criteria. The cities and sanitation districts will be responsible for incorporating the sizing criteria into their rules and regulations. Each business establishment, for which a grease interceptor is required, shall have an interceptor which serve’s only that establishment. The design of oil and grease interceptors shall be constructed in accordance with the design approved by the City of xxx and shall have a minimum of two (2) compartments with fittings designed for grease retention.

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There shall be an adequate number of manholes to provide access for cleaning all areas of an interceptor; a minimum of one (1) per ten (10) feet of interceptor length. Manhole covers shall be gastight in construction having a minimum opening dimension of twenty-four (24) inches. In addition, an effluent sampling box shall be provided on all grease interceptors. In areas where traffic may exist the interceptor shall be designed to have adequate reinforcement and cover. One complete set of plans shall be submitted to the City of xxx including mechanical and plumbing sections. The plans should also include size, type and location of each interceptor. The City of xxx Building Inspection Division and Industrial Pretreatment Program shall approve the size and type of interceptor prior to construction. 1.3 GREASE INTERCEPTORS LOCATION

Each grease interceptor shall be so installed and connected that it shall be at all times easily accessible for inspection, cleaning, and removal of the intercepted grease. The use of ladders and removal of bulky equipment will result in violation of accessibility. The interceptor shall be located as close to the source as practical, however it must be outside the facility served. In no case shall a grease interceptor be installed in any part of a building where food is handled. The location of any grease interceptor shall meet the approval of the City of xxx Building Inspection Division and Industrial Pretreatment Program. 1.4 GREASE INTERCEPTORS SIZING CRITERIA

The parameters for sizing a grease interceptor are hydraulic loading and grease storage capacity, for one or more fixtures. The size of the interceptor shall be determined by the following formula: Liquid Capacity = Number of meals at peak hour1 X waste flow rate2 X retention time3 X storage factor4 1. Meals Served at Peak Hour 2. Waste Flow Rate – With dishwashing machine Without dishwashing machine Single service kitchen Food waste disposal (add to above) Commercial kitchen waste dishwasher Single service kitchen single serving Fully equipped commercial kitchen 6 gallon (22.7 L) flow 5 gallon (18.9 L) flow 2 gallon (7.6 L) flow 1 gallon (3.8 L) flow 2.5 hours 1.5 hours 8 hour operation: 1 16 hour operation: 2 24 hour operation: 3 1.5

3. Retention Times -

4. Storage Factors -

Single service kitchen

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1.5

INSPECTION OF GREASE INTERCEPTORS

The City of xxx’s Industrial Pretreatment Program may inspect all grease interceptors in the City’s service area. The cities and sanitation districts connected to the City of xxx’s wastewater collection system will develop a mechanism to inventory all grease interceptors in their service area and document the inspections of these interceptors. Once the grease interceptors in the service area are identified, the interceptors will be classified into two (2) categories:  Problem or Significant Grease Interceptors The facilities connected to these grease interceptors contribute significant amounts of animal/vegetable oil and grease to the wastewater collection system. These grease interceptors will be inspected at a frequency of at least once every three (3) to six (6) months.  Non-significant Grease Interceptors The facilities connected to these grease interceptors do not contribute significant amounts of animal/vegetable oil and grease to the sanitary sewer system. These grease interceptors will be inspected at a frequency of every six (6) to twelve (12) months. 1.5 GREASE INTERCEPTOR MAINTENANCE AND PUMPING SCHEDULES

The owner and lessee are jointly responsible for the cleaning of the interceptor. It shall be maintained in efficient operating condition by the removal of accumulated grease and solids. The removal of grease and solids shall be performed before the capacity of the interceptor is exceeded. The owner and/or lessee shall conduct, on a monthly basis, an inspection on each interceptor. Records of these inspections must be kept on site for a minimum of three (3) years. Initially, all Business/Industrial Users connected to grease interceptors are required to pump out their interceptor’s quarterly or every three (3) months. Inspections of the grease interceptors by the City of xxx, connector city or sanitation district will determine if this frequency needs to be increased to control the amounts of oil and grease entering the sanitary sewer system or if the pumping frequency can be decreased. In the event that an interceptor fails the City of xxx, connector city or sanitation district inspection, the owner/lessee shall have two (2) weeks to bring the facility into compliance. If the interceptor still fails after the second inspection, the City shall contract with an approved contractor to bring the facility into compliance. The cost of the work shall be billed to the owner/lessee of the facility. Failure to pay for the resulting bill shall result in additional enforcement actions being taken. 1.5 BIOLOGICAL TREATMENT

Biological treatment shall not be a substitute for the pumping of the grease interceptor at the frequency determined by the City of xxx, connector city or sanitation district.

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1.6

EXISTING SOURCES NOT CONNECTED TO GREASE INTERCEPTORS

Existing sources not connected to grease interceptors and which contribute significant amounts will be identified through inspection of the collection systems by the City of xxx, connector city or sanitation districts. Once these sources are identified, they will be required to implement Best Management Practices Plans (BMPP’s) to keep oil and grease out of the wastewater collection system. Examples of a BMPP’s include: Scrape food from plates into a garbage can. Prewash plates by spraying them off with cold water over a small mesh catch basin positioned over a drain. This catch basin should be cleaned into a garbage can as needed. 3. Pour all liquid oil and grease from pots and pans into a waste grease bucket stored at the potwashing sink. Heavy solids build up of oil and grease on pots and pans should be scraped off into a waste grease bucket. 4. Other kitchen practices identified by the City of xxx or sanitation district and/or facility which will decrease the point source discharge of oil and grease.
1. 2.

If the BMPP’s are not successful at the facility and the facility continues to contribute significant amounts of oil and grease to the wastewater collection system, as documented by field inspections, then the facility will be required to install an adequately sized grease interceptor. 1.7 Abandoned Grease Interceptors Abandoned grease interceptors shall be pumped and filled as required for abandoned sewers and sewage disposal facilities as outlined in the Uniformed Plumping Code Section xxx.

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