[Added 2-26-2007, effective 3-26-2007]
The purpose of this article is to outline the
wastewater pretreatment requirements for food preparation establishments
and other commercial facilities that discharge fats, oils, and grease
in their wastewater flow. All new and existing facilities that generate
and discharge fats, oils, and grease (FOG) in their wastewater flow
shall install, operate, and maintain a FOG pretreatment system. The
requirements of this article shall supplement and be in addition to
the requirements of the Town’s Sewers and Water Ordinance.
As used in this article, the following terms
shall have the meanings indicated:
The individual responsible for overseeing daily operation
of the food preparation establishment and who is responsible for overseeing
the food preparation establishment's compliance with the FOG pretreatment
program.
Animal and plant-derived substances that may solidify or
become viscous between the temperatures of 32° F. and 150°
F. (0° C. to 65° C.), and that separate from wastewater by
gravity; any edible substance identified as grease per the most current
EPA method as listed in 40 CFR 136.3.
A passive tank installed outside a building and designed
to remove fats, oils, and grease from flowing wastewater while allowing
wastewater to flow through it, and as further defined herein.
Properly installed and operated FOG interceptors and FOG
recovery units as approved by the Mansfield Water Pollution Control
Authority.
All active indoor mechanical systems designed to remove fats,
oils, and grease by physical separation from flowing wastewater, as
further defined herein.
Class III and Class IV food service establishments and any
other facility determined by the Mansfield Water Pollution Control
Authority to discharge FOG above the set limits in Section 5(b)(2)
of the Department of Environmental Protection's General Permit for
the Discharge of Wastewater Associated with Food Preparation Establishments.
These facilities shall include but not be limited to restaurants,
hotel kitchens, hospital kitchens, school kitchens, bars, factory
cafeterias, and clubs. Class III and Class IV food service establishments
shall be as defined under Section 19-13-B42 of the State of Connecticut
Public Health Code.
Food-grade grease that has become contaminated with sewage,
detergents, or other constituents that make it unacceptable for rendering.
Written notification from the Mansfield Water Pollution Control
Authority for authorization to install and/or operate an alternate
FOG pretreatment system.
Material that can be recovered and sent to renderers for
recycling into various usable products. Renderable grease is created
from spent products collected at the source, such as frying oils and
grease from restaurants. This material is also called “yellow
grease.”
A closed, leakproof container for the collection and storage
of food-grade fats, oils, and grease.
A facility for the collection and disposal of nonrenderable
FOG approved by the Connecticut Department of Environmental Protection.
The authorized representative of the Town of Mansfield.
A.
FOG pretreatment systems shall be provided for:
(1)
All new and existing food preparation establishments,
including restaurants, cafeterias, diners, and similar nonindustrial
facilities using food preparation processes that have the potential
to generate FOG in wastewater at concentrations in excess of the limits
defined in this article.
(2)
New and existing facilities which, in the opinion
of the Mansfield Water Pollution Control Authority, require FOG pretreatment
systems for the proper handling of wastewater containing fats, oils,
or grease, except that such FOG pretreatment systems shall not be
required for private living quarters or dwelling units.
B.
All new food preparation establishments which generate
and discharge wastewater containing fats, oils, and grease and which
will require a FOG pretreatment system, as determined by the Mansfield
Water Pollution Control Authority, shall include the design and specifications
for the FOG pretreatment system as part of the sewer connection application
as described in the Mansfield Sewers and Water Ordinance.
C.
All existing food preparation establishments which
generate, and discharge wastewater containing fats, oils, and grease,
and which require a new FOG pretreatment system, as determined by
the Mansfield Water Pollution Control Authority, shall submit an application
for the installation of a new FOG pretreatment system within 18 months
of adoption of this article. The application shall be in accordance
with Mansfield’s Sewers and Water Ordinance. The approved FOG
pretreatment system shall be installed within two years of adoption
of this article.
D.
Existing food preparation establishments which generate, and discharge wastewater containing fats, oils, and grease, and which have an existing noncomplying FOG pretreatment system, may, as determined by the Mansfield Water Pollution Control Authority, operate the existing FOG pretreatment system. Such facilities shall submit an application for an alternate FOG pretreatment system as described in § 159-42C. Such application shall be submitted within 12 months of adoption of this article.
E.
All costs and related expenses associated with the
installation and connection of the FOG interceptor(s) or alternate
FOG pretreatment system(s) shall be borne by the food preparation
establishment. The food preparation establishment shall indemnify
the Town of Mansfield and its agents from any loss or damage that
may directly or indirectly occur due to the installation of the FOG
pretreatment system.
No facility shall discharge or cause to be discharged
any wastewater with a FOG concentration in excess of 100 milligrams
per liter, as determined by the currently approved test for total
recoverable fats and grease listed in 40 CFR 136.3, or in concentrations
or in quantities which will harm either the sewers, or water pollution
control facility, as determined by the Mansfield Water Pollution Control
Authority.
A.
An application for the design and installation of
a FOG pretreatment system shall be subject to review and approval
by the Mansfield Water Pollution Control Authority per the Town’s
Sewers and Water Ordinance, and subject to the requirements of all
other applicable codes, ordinances, and laws.
B.
Except as provided by § 159-42, the wastewater generated from food preparation establishments shall be treated to remove FOG using a FOG interceptor.
C.
Every structure at the subject facility shall be constructed,
operated, and maintained in a manner to ensure that the discharge
of food preparation wastewater is directed solely to the FOG interceptor,
or alternate FOG pretreatment system. No valve or bypass piping that
could prevent the discharge of food preparation wastewater from entering
appropriate pretreatment equipment shall be present.
D.
The contact person at each food preparation establishment
shall notify the Mansfield Water Pollution Control Authority when
the FOG pretreatment system is ready for inspection and connection
to the public sewer. The connection and testing shall be made under
the supervision of the plumbing inspector and/or the Town’s
agent.
E.
All applicable local plumbing/building codes shall
be followed during the installation of the FOG pretreatment system.
F.
FOG interceptor requirements.
(1)
The FOG interceptor shall be installed on a separate
building sewer servicing kitchen flows and shall only be connected
to those fixtures or drains which can allow fats, oils, and grease
to be discharged into the sewer. This shall include:
(a)
Pot sinks;
(b)
Prerinse sinks, or dishwashers without prerinse
sinks;
(c)
Any sink into which fats, oils, or grease may
be introduced;
(d)
Soup kettles or similar devices;
(e)
Wok stations;
(f)
Floor drains or sinks into which kettles may
be drained;
(g)
Automatic hood wash units;
(h)
Dishwashers without prerinse sinks; and
(i)
Any other fixtures or drains that can allow
fats, oils, and grease to be discharged into the sewer.
(2)
No pipe carrying any wastewater other than from those
listed in the subsection above shall be connected to the FOG interceptor.
(3)
No food grinder shall discharge to the FOG interceptor.
(4)
The FOG interceptor shall be located so as to maintain
the separating distances from well water supplies set forth in Section
19-13-B51d of the Public Health Code.
(5)
The following minimum separating distances shall be
maintained between the FOG interceptor and the items listed below:
(6)
The FOG interceptor shall have a retention time of
at least 24 hours at the maximum daily flow based on water meter records
or other calculation methods as approved by the Mansfield Water Pollution
Control Authority. The FOG interceptor minimum capacity shall be 1,000
gallons. FOG interceptors shall have a minimum of two compartments.
The two compartments shall be separated by a baffle that extends from
the bottom of the FOG interceptor to a minimum of five inches above
the static water level. An opening in the baffle shall be located
at mid-water level. The size of the opening shall be at least eight
inches in diameter but not have an area exceeding 180 square inches.
(7)
The FOG interceptor shall be watertight and constructed
of precast concrete or other durable material.
(8)
FOG interceptors constructed of precast concrete shall
meet the following requirements:
(a)
The exterior of the FOG interceptor, including
the exterior top and bottom and extension to grade manholes, shall
be coated with a waterproof sealant.
(b)
All concrete FOG interceptors shall be fabricated
using minimum 4,000-psi concrete per ASTM standards with 4% to 7%
air entrainment.
(c)
All structural seams shall be grouted with nonshrinking
cement or similar material and coated with a waterproof sealant.
(d)
Voids between the FOG interceptor walls and
inlet and outlet piping shall be grouted with nonshrinking cement
and coated with a waterproof sealant.
(9)
All nonconcrete septic tanks must be approved for
use by the Mansfield Water Pollution Control Authority.
(10)
The FOG interceptor shall be accessible for
convenient inspection and maintenance. No structures shall be placed
directly upon or over the FOG interceptor.
(11)
The FOG interceptor shall be installed on a
level stable base that has been mechanically compacted with a minimum
of six inches of crushed stone to prevent uneven settling.
(12)
Select backfill shall be placed and compacted
around the FOG interceptor in a manner to prevent damage to the tank
and to prevent movement caused by frost action.
(13)
The outlet discharge line from the FOG interceptor
shall be directly connected to the municipal sanitary sewer.
(14)
The FOG interceptor shall have a minimum liquid
depth of 36 inches.
(15)
Separate clean-outs shall be provided on the
inlet and outlet piping.
(16)
The FOG interceptor shall have separate manholes
with extensions to grade, above the inlet and outlet piping. FOG interceptors
installed in areas subject to traffic shall have manhole extensions
to grade with ductile iron frames and round manhole covers. The word
"SEWER" shall be cast into the manholes covers. FOG interceptors installed
outside areas subject to traffic may have concrete risers with lids
either having a minimum weight of 59 pounds or shall be provided with
a lock system to prevent unauthorized entrance. All manholes and extensions
to grade providing accesses to the FOG interceptor shall be at least
17 inches in diameter.
(17)
Inlet and outlet piping shall have a minimum
diameter of four inches and be constructed of Schedule 40 PVC meeting
ASTM 1785 with solvent weld couplings.
(18)
The inlet and outlet shall each utilize a tee-pipe
on the interior of the FOG interceptor. No caps or plugs shall be
installed on the tee-pipes. The inlet and outlet shall be located
at the center line of the FOG interceptor and at least 12 inches above
the maximum groundwater elevation. The inlet tee shall extend to within
12 inches of the bottom of the FOG interceptor. The inlet invert elevation
shall be at least three inches above the invert elevation of the outlet
but not greater than four inches. The outlet tee-pipe shall extend
no closer than 12 inches to the bottom of the FOG interceptor and
the diameter of this tee-pipe shall be a minimum of four inches.
(19)
The diameter of the outlet discharge line shall
be at least the size of the inlet pipe and in no event less than four
inches.
(20)
When necessary due to installation concerns,
testing for leakage will be performed using either a vacuum test or
water-pressure test.
(a)
Vacuum test: Seal the empty tank and apply a
vacuum to two inches of mercury. The tank is approved if 90% of the
vacuum is held for two minutes.
(b)
Water pressure test: Seal the tank, fill with
water, and let stand for 24 hours. Refill the tank. The tank is approved
if the water level is held for one hour.
A.
When it is not practical for the food preparation establishment to install an outdoor in-ground FOG interceptor per § 159-41, an alternate FOG pretreatment system may be utilized upon approval by the Mansfield Water Pollution Control Authority and upon receiving a notification of approved alternative FOG pretreatment system. Approval of the system shall be based on demonstrated (proven) removal efficiencies and reliability of operation. The Mansfield Water Pollution Control Authority will approve these systems on a case-by-case basis. The contact person may be required to furnish the manufacturer’s analytical data demonstrating that FOG discharge concentrations do not exceed the limits established in this article.
C.
Alternate FOG pretreatment systems shall meet the requirements of § 159-41A through E and § 159-41F(2) and (3) and shall be installed immediately downstream of each of the fixtures and drains listed in § 159-41F(1).
D.
Alternate FOG pretreatment system requirements.
(1)
FOG recovery units shall be sized to properly pretreat
the measured or calculated flows using methods approved by the Mansfield
Water Pollution Control Authority.
(2)
FOG recovery units shall be constructed of corrosion-resistant
material such as stainless steel or plastic.
(3)
Solids shall be intercepted and separated from the
effluent flow using a strainer mechanism that is integral to the unit.
(4)
FOG recovery units shall operate using a skimming
device, automatic draw-off, or other mechanical means to automatically
remove separated FOG. This skimming device shall be controlled using
a timer, FOG sensor, or other means of automatic operation. FOG recovery
units operated by timer shall be set to operate no less than once
per day.
(5)
FOG recovery units shall be included with an internal
or external flow control device.
(6)
FOG recovery units shall be located to permit frequent
access for maintenance and inspection.
E.
Other alternate FOG pretreatment systems.
(1)
Other alternate FOG pretreatment systems that do not meet the requirements of § 159-41F or § 159-42D may be considered for approval by the Mansfield Water Pollution Control Authority on a case-by-case basis. The application shall include:
(a)
Documented evidence that the alternate FOG pretreatment system will not discharge FOG concentrations that exceed the discharge limits per § 159-40.
(b)
Plans and specifications for the proposed system,
including plans and profile of system installation, manufacturer's
literature, documentation of performance and any other information
detailing the alternate system.
(c)
A written operation and maintenance plan, which
shall include the schedule for cleaning and maintenance, copies of
maintenance log forms, a list of spare parts to be maintained at the
subject facility, and a list of contacts for the manufacturer and
supplier. Following receipt of written notification of approved alternate
FOG pretreatment system from the Mansfield Water Pollution Control
Authority, the operation and maintenance plan shall be maintained
on the premises. The plan shall be made available for inspection on
demand by the Town’s agent.
(d)
A written FOG minimization plan, which shall
include procedures for all food preparation establishment employees
to minimize FOG entering the wastewater collection system.
(e)
Description of a FOG pretreatment training program
for food preparation establishment employees in minimization procedures.
(2)
A notification of approved alternate FOG pretreatment system may be granted for a duration not to exceed three years, with extensions, when demonstrated to the satisfaction of the Mansfield Water Pollution Control Authority that the alternate FOG pretreatment system, operation and maintenance plan, FOG minimization plan and FOG pretreatment training program are adequate to maintain the FOG concentration in the wastewater discharge below the limits set in § 159-40.
A.
The FOG pretreatment system shall be maintained continuously
in satisfactory and effective operation, at the food preparation establishment's
expense.
B.
The contact person shall be responsible for the proper
removal and disposal, by appropriate means, of the collected material
removed from the FOG pretreatment system.
C.
A record of all FOG pretreatment system maintenance
activities shall be maintained on the premises for a minimum of five
years.
D.
The contact person shall ensure that the FOG interceptor
is inspected when pumped to ensure that all fittings and fixtures
inside the interceptor are in good condition and functioning properly.
The depth of grease inside the tank shall be measured and recorded
in the maintenance log during every inspection along with any deficiencies
and the identity of the inspector.
E.
The contact person shall determine the frequency at
which its FOG interceptor(s) shall be pumped according to the following
criteria:
(1)
The FOG interceptor shall be completely cleaned by
a licensed waste hauler when 25% of the operating depth of the FOG
interceptor is occupied by grease and settled solids, or a minimum
of once every three months, whichever is more frequent.
(2)
If the contact person can provide data demonstrating
that less frequent cleaning of the FOG interceptor will not result
in a grease level in excess of 25% of the operating depth of the FOG
interceptor, the Mansfield Water Pollution Control Authority may allow
less frequent cleaning. The contact person shall provide data, including
pumping receipts, for four consecutive cleanings of the FOG interceptor,
complete with a report from the FOG hauler indicating the grease level
at each cleaning, and the FOG interceptor maintenance log.
(3)
A maintenance log shall be maintained on the premises
and shall include the following information: dates of all activities,
volume pumped, grease depth, hauler's name, location of the waste
disposal, means of disposal for all material removed from the FOG
interceptor, and the name of the individual recording the information.
The maintenance log and waste hauler’s receipts shall be made
available to the Town’s agent for inspection on demand. Interceptor
cleaning and inspection records shall be maintained on file a minimum
of five years.
F.
All removal and hauling of the collected materials
must be performed by state-approved waste disposal firms. Pumped material
shall be disposed of at a regional FOG disposal facility. Pumping
shall include the complete removal of all contents, including floating
materials, wastewater and settled sludge. Decanting back into the
FOG interceptor shall not be permitted. FOG interceptor cleaning shall
include scraping excessive solids from the wall, floors, baffles and
all piping.
G.
The contact person shall be responsible for the cost
and scheduling of all installation and maintenance of FOG pretreatment
system components. Installation and maintenance required by the Town’s
agent shall be completed within the time limits as given below:
|
Violation
|
Days from Inspection to Correct Violation
|
|---|---|
|
Equipment not registered
|
30
|
|
Installation violations (outdoor and indoor)
|
90
|
|
Operational violations
|
30
|
A.
The contact person shall make every practical effort
to reduce the amount of FOG contributed to the sewer system.
B.
Renderable fats, oils, and grease shall not be disposed
of, in any sewer or FOG interceptor. All renderable fats, oils, and
grease shall be stored in a separate, covered, leakproof, renderable
FOG container, stored out of reach of vermin, and collected by a renderer.
C.
Small quantities of FOG scraped or removed from pots,
pans, dishes and utensils shall be directed to the municipal solid
waste stream for disposal.
