§ 18-103. Grease interceptors and oil/water separator and similar oil and grease removal devices.

(a)

Requirements:

(1)

All industrial users that generate oil and grease of animal or vegetable origin shall install adequately sized grease interceptors or other grease removing pretreatment equipment as required by the director. Grease interceptors shall be installed at the user's expense, when such user operates a cooking establishment. Grease interceptors may also be required in non-cooking or cold dairy and frozen foodstuffs establishments and other industrial or commercial establishments when it is deemed necessary by the director for the proper handling of liquid wastes containing grease.

(2)

All industrial users which have lubricating oil, cutting oil, kerosene, gasoline, naptha, paraffin, trisodium phosphate and any other light density or volatile oil or any other oil of petroleum or mineral origin shall install adequately sized oil/water separator or similar device to remove the oil as required by the director.

(b)

Design, sizing, operation and maintenance:

(1)

No user shall allow wastewater discharge concentration from any grease interceptor, oil/water separator or similar device to exceed that specified in subsection 18-94(b). All grease interceptors, oil/water separator or similar device shall be of a type, design, and capacity approved by the Department of Building Inspection of Chesterfield County and shall be readily and easily accessible for user cleaning and county inspection. All such grease interceptors, oil/water separator and similar devices shall be serviced by user and emptied of accumulated waste content as required in order to maintain minimum design capability or effective volume of the grease interceptor or similar devices.

(2)

Industrial users who are required to operate a grease interceptor and/or oil/water separator and/or similar device shall:

(a)

Size the grease interceptor and oil/water separator in accordance with the International Plumbing Code. The grease interceptor sizing shall also consider the type of food being prepared, seating capacity, frequency of maintenance, equipments connected to the trap and any other pertinent factors.

(b)

Inspect the grease interceptor, oil/water separator or similar device every two weeks if not sooner.

(c)

Adequately cover the grease interceptor, oil/water separator and other similar device to exclude stormwater from entering the sewer system.

(d)

For grease interceptor, remove any accumulated grease cap and sludge pocket as required at the users expense. Grease interceptors shall be kept free of inorganic solid materials such as grit, rocks, gravel, sand, eating utensils, cigarettes, shells, towels, rags, etc., which could settle into this pocket and thereby reduce the effective volume of the grease interceptor.

(e)

Grease interceptor, oil/water separator shall be pumped out and cleaned, at a minimum, when 80 percent of the retention capacity is filled with oil and grease and/or solids, or on a more frequent basis as determined by the industrial user or the county.

(f)

For oil/water separator being used for any vehicle wash facility, provide a grit interceptor.

(g)

Accept the following conditions: If any skimmed or pumped wastes or other materials removed from grease interceptor are treated in any fashion onsite and reintroduced back into the grease interceptor as an activity of and after onsite treatment, the user shall be responsible for the attainment of established oil and grease numerical limit consistent with subsection 18-93(b) before discharging into Chesterfield County's sewerage system.

(h)

Operate the grease interceptor, oil/water separator or similar device in a manner to consistently achieve attainment of oil and grease limit. "Consistently" shall mean any wastewater sample taken from the downstream side of the device shall be subject to terms of numerical limit attainment described in subsection 18-93(b).

(i)

Shall not connect the garbage disposal or nongrease laden sources to the grease interceptor or similar device.

(j)

Shall evaluate the adequacy of the size of grease interceptor or other similar devices should the menu or seating capacity changes and notify the Department of Building Inspection of Chesterfield County in writing within two weeks of the change.

(c)

Recordkeeping:

(1)

The industrial user shall maintain a written record of trap, oil/water separator, interceptor or similar device maintenance for three years. All such records shall be available for inspection by Chesterfield County at all times.

(2)

Shall maintain at its facility and practice the best management plan and/or waste minimization plan for oil and grease control.

(3)

Shall maintain a written standard operating procedure for that equipment posted in a location accessible to all operating personnel.

(d)

Enforcement and cost recovery:

(1)

If at any time Chesterfield County's sewerage system is obstructed that causes a sewer overflow to the extent that an impact on the environment is realized and an overflow or failure of the sanitary sewer collection system to convey sewage can be attributed in part or in whole to accumulation of grease in Chesterfield County's sewer main(s), Chesterfield County will take appropriate enforcement actions, as stipulated in the county's approved Industrial Pretreatment Enforcement Plan and Sewer Use Ordinance, against the generator or contributor of such grease. Industrial user's shall reimburse the county for all the cost associated with cleaning the sewer system. The industrial user will also be liable for all the damages to the environment, property and personnel as a result of its grease contribution to the sanitary sewer overflows.

(2)

As a part of enforcement action, Chesterfield County may require supplemental environmental projects to mitigate the environmental damage done by industrial users not managing their grease in accordance with Chesterfield County's Sewer Use Ordinance.

(3)

Existing industrial users that either do not have oil/water separator, grease interceptor or other similar devices, or the existing device is undersized shall be put on a compliance schedule not to exceed six months to comply with the requirements of this section.

(Ord. of 4-29-09(1), § 1)

(Ord. of 4-29-09(1), § 1)