sizing sheet, Commissary Kitchen 7-30-2020City of Edmonds
Hydromechanical Grease Interceptor & Gravity
Grease Interceptor Permit Submittal Requirements
The City of Edmonds Municipal Code for Wastewater Pretreatment (Title 7.90 through
7.102) requires all food service businesses to remove fats, oils, and grease (FOG) from their
wastewater to protect the City's sewage system. An approved Hydromechanical Grease
Interceptor (HGI) or Gravity Grease Interceptor (GGI), complying with the City's requirements,
shall be installed downstream from fixtures or equipment that may discharge FOG from
establishments such as: restaurants, cafes, cafeterias, bars, coffee shops, delis, bakeries, butcher
shops, grocery stores, donut shops, hotels, hospitals, school kitchens, or other establishments
where FOG may be introduced into the sanitary sewer system. In most cases, new food service
facilities will be required to install a GGI, which is a two -compartment tank of at least 500 gallon
capacity located underground outside the facility. Most existing businesses will be permitted to
continue to use a HGI, which are much smaller units located on or in the floor near the fixtures
they serve. Single family dwelling units are exempt from these requirements.
FEE: Hydromechanical Grease Interceptor - $165 (plumbing permit);
Gravity Grease Interceptor - $365 (side sewer permit)
INSTRUCTIONS FOR THE PERMITTEE:
1. Complete the "Grease Removal Equipment Application" form (attached).
2. Contact the Pretreatment Technician (office: 425-672-5755; mobile: 206-595-3117) to
discuss the type, size, and installation of equipment that will be required.
3. Complete the "Hydromechanical Grease Interceptor Sizing Worksheet" or the "Gravity
Grease Interceptor Sizing Worksheet" (attached), and have it approved and signed by the
Pretreatment Technician prior to submitting permit application to the Building Department.
4. Draw a kitchen floor plan showing all plumbing fixtures and drains (sinks, floor drains, soup
kettle drains, wok fixture drains, mop sinks, pre -wash station, dishwasher, etc.) that are to be
connected to the GGI. If the application is for a HGI, show the proposed location of the HGI
and the fixtures and piping to be connected to it.
5. Additionally, if the application is for a GGI, provide three (3) site plans showing the location
of the building, parking and drive aisles, location and depth of existing sewer line and
connecting pipes. If landscaping or parking will be disrupted, additional information may be
required. If GGI lids are exposed to vehicular traffic, the unit must meet appropriate
DOT/APWA load -bearing specifications.
6. Provide a copy of the equipment specifications. Include specific size information for HGI's
(e.g. 35gpm/701b. retention). Include cut sheets and dimensions for GGI's.
7. Submit all required information, including sizing worksheet signed by the Pretreatment
Technician, to the Building Department on the 2nd floor at City Hall at 121 51h Ave. N. HGI
permits are issued over the counter. A GGI permit must be reviewed and approved and then
you will be contacted when it is ready for pick up. Fees are due at permit issuance.
8. Contact the Pretreatment Technician for inspection and final approval when installation is
complete. GGI's must also be filled with water for leak testing and then inspected prior to
backfilling and covering.
[Rev. November 2016]
HYDROMECHANICAL GREASE INTERCEPTOR
REQUIREMENTS
NOTE: THE PURPOSE OF THIS HANDOUT IS TO ASSIST THE PUBLIC IN COMPLYING WITH DETAILED PERMrr SUBMITTAL
REQUMEMENTS. IT IS NOT A COMPLETE LIST OF PERMIT OR CODE REQUIREMENTS AND SHOULD NOT BE USED AS A
SUBSTITUTE FOR APPLICABLE LAWS AND REGULATIONS.
GENERAL INFORMATION
A Hydromechanical Grease Interceptor (HGI) is a smaller grease collection device installed on
the interior of the building (above or below the floor line) that collects fat, oils, and _ grease
(FOG) discharged into the waste drainage system from sinks and other grease producing fixtures.
The purpose of a HGI is to protect downstream pipes and the City's sewer system by providing
enough retention time to allow the FOG to separate from the water and accumulate at the top of
the HGI where it can be periodically removed and discarded along with other solid wastes.
The size of the HGI is based on the number, type and flow rate of plumbing fixtures to be
connected to the trap (see accompanying worksheet).
A HGI may serve up to four fixtures and must be IAPMO approved and listed. A HGI must
have an approved type flow control valve or restricting device installed on the inlet of the HGI.
A vent must be installed on the inlet of every HGI (follow the UPC code on HGI venting).
HGI's shall be installed for easily accessible inspection, cleaning, and removal of collected
grease and settled solids. HGI's should be placed as close as practical to the fixtures they serve.
NOTE: Food disposal units are not allowed in a facility served by a HGI. Food waste must be
screened from entering the sewage system and disposed with the solid waste. Dishwashers
shall not be connected to a HGI; therefore practices must be instituted to thoroughly rinse
dishware with hot water in a sink that is connected to the HGI prior to being placed in the
dishwasher.
Business Owner Responsibilities for HGI Cleaning and Maintenance
1) Each food service business shall be solely responsible for the cost of the HGI installation,
inspection, cleaning and maintenance. A business may contract with a grease hauler for
cleaning or the business can perform cleaning and waste removal themselves, provided the
maintenance schedule is properly documented. Failure to clean and maintain the HGI may
result in Notices of Violation, fines, penalties, and other civil actions as described in the City
Code.
2) Cleaning and maintenance shall be performed on a routine schedule such that the total
volume of captured grease and settled solid material never displaces more than 25% of the
total volume of the HGI. The cleaning frequency shall be at least once per week unless an
alternate schedule is approved by the Pretreatment Technician.
3) Grease and solid materials removed from a HGI shall be disposed of in the solid waste.
4) Records shall be maintained that include the date and time of all cleaning and maintenance of
each HGI. Such records shall be available for inspection by City personnel on demand.
[Rev. November 2016]
GRAVITY GREASE INTERCEPTOR REQUIREMENTS
NOTE: THE PURPOSE OF THIS HANDOUT IS TO ASSIST THE PUBLIC IN COMPLYING WITH DETAILED PERMIT SUBMITTAL
REQUIREMENTS. IT IS NOT A COMPLETE LIST OF PERMIT OR CODE REQUIREMENTS AND SHOULD NOT BE USED AS A
SUBSTITUTE FOR APPLICABLE LAWS AND REGULATIONS.
GENERAL INFORMATION
Gravity Grease Interceptors (GGI) are larger grease collection devices installed on the exterior
of the building and are designed for the removal of fats, oils and grease in order to protect
downstream piping and the public sewer system. GGI's are required for restaurants, commercial
kitchens, school kitchens, grocery stores, hospitals, and other facilities where FOG may be
introduced into the sewage system and which do not meet criteria to use an indoor HGI. GGI's
are sized according to the accompanying worksheet.
The minimum sized Gravity Grease Interceptor per City Code is 500 gallons.
NOTE: A food waste disposal unit may be connected to a GGI, however, due to higher
sediment loading; more frequent cleaning will be required. Wholesale grinding and disposal
of food waste into the interceptor or sewer system is forbidden. All fixtures and drains, except
for restroom fixtures, should be connected to the GGI,
Business Owner Responsibilities for GGI Cleaning and Maintenance
1) Each food service business shall be solely responsible for the cost of the GGI installation,
inspection, cleaning and maintenance.
2) Businesses shall contract with an approved grease hauler to perform cleaning. Pumping
services shall include the complete removal of all contents, including floating materials,
wastewater and bottom solids. Decanting or discharging of liquid waste back into the grease
interceptor is strictly prohibited. GGI cleaning shall include removal of solids from the walls,
floors, baffles, and all pipe work.
3) Each business shall be responsible for maintaining the GGI in good functioning order. It is
recommended that the business inspect the GGI after it has been pumped out to ensure that
all fittings, pipes, and baffles are in good operating condition.
4) The business shall maintain records of the date and time of all cleaning and maintenance and
shall make this record available for inspection on demand. The City's Pretreatment
Technician may perform periodic unscheduled inspections of GGI's and maintenance records
to assure compliance to the code. Failure to clean and maintain the GGI may result in
Notices of Violation, fines, penalties, and other civil actions as described in the City Code. If
a failure to maintain a GGI leads to partial or complete blockage of the city sewer system, or
adversely affects the treatment or transmission capabilities of the Wastewater Treatment
Plant, or require excessive maintenance by the city, the discharger responsible of the
facilities shall be subject to the remedies herein, including cost recovery by the city.
5) Cleaning and maintenance shall be performed on a routine schedule such that the total
volume of captured grease and settled solid material never displaces more than 25% of the
total volume of the unit. The cleaning frequency shall be at least once every three months
unless an alternate schedule is approved by the Pretreatment Technician.
[Rev. November 2016]
CITY OF EDMONDS
Grease Removal Equipment Application
Business Name: 23423 Cow)wiissOlrN Kitchevl Date Submitted: D7/22/2DZD
Address: 23423 4410l waN Cic"! :EJmov0s, WA Ci802(P Suite No.: Vl/'�l
Business Owner: Lovio Pmi Mailing Address: 5720 NIE 133P--P -FL, KI -KLAN P, WA,
LiSD34
Contact Person/Title: Nos Narivi - Pcsioi Firvv) Phone: 2D(0-322-4323
Days/Hours of Operation: WlMJaN - SmvAn9 Ll Mn - 10:PtM
Total Number of Meals Served Per Peak Hour (assume all seats filled): 100
Number of Seats: Dining: x Lounge/Bar: x Banquet Rooms: x Deck/Patio: x
Building Occupancy Permit Capacity: 12 Health Dept. Permit Capacity 12
Inventory of Kitchen Equipment and Plumbing Fixtures for this Establishment: (Grills,
burners, ovens, hoods, deep fat fryers, wok stations, soup kettles, sinks, pre -wash sinks,
dishwashers, disposers, mop sinks, floor drains, etc.)
brill = QtN 1 ,-Dmrvier = QtN 4 , Ovevi = QtN 1 , Class 1 4400J = QtN 2 , _Peep -Frtier = QtN 2
What proportion, if any, of the dishware used is of the disposable type? No Asposal�le Ashware
iv] klt&eVI
How is waste oil/grease handled, stored, and recycled/disposed?
(�reolse is jr'livlcj to *e crease iviterceptor
Waste oil is disposed of W '�l',rd PartN service
Estimate gallons of waste oil/grease produced per month:
If recycled, by which company? Waste may aoVVIev1t
1ci0
How are vent hoods cleaned and where does the cleaning waste go?
Vevit �oojs cle�Ivlod bN *ird PartN cowip'�ivlq eyerN (P wnoviths aVid waste is Asposod of
bN Wnste MaV1&19ew)ev1t.
Contact the Pretreatment Technician at 425-672-5755 to discuss the type and
size of equipment you must install, and then complete the appropriate
accompanying worksheet for either a Gravity Grease Interceptor or a
Hydromechanical Grease Interceptor.
[Rev. November 2016]
Hydromechanical Grease Interceptor Sizing Worksheet
Facility Name:
23423 C0whw)is5&1r� Ki+cl evi
Address: 23423 44m qq EdMovicls, WA 93D2( Suite No.: v'/1
• A Hydromechanical Grease Interceptor (HGI) plumbing permit is required ($165.00 fee).
Contact the Pretreatment Technician (425-672-5755) if you have any questions regarding this
form.
• Dishwashers are not allowed to be connected to a HGI.
• Food disposers are not allowed in a facility served by a HGI and must be disabled or
removed. Solids must be screened out and placed in the solid waste container.
Fixture Capacity in Cubic
Inches
(L x W x D x no. of sinks)
Fixture Capacity
in Gallons
(Cu. In.— 231)
Drainage Load
(75% of Total
Capacity)
Flow Rate for
a 2-Minute
Drain Period
#1
24 x24x 12x 1 = 61g12 c.i.
- 231 = 30 al.
x .75 = 22 gal.
- 2 = 11 gpm
#2
18 x18 x14 x 1 = 453�1 c.i.
- 231 = 20 al.
x .75 = 14 gal.
- 2 = m
#3
1(P x1( x &5, 2 = 43 52- c.i.
- 231 = 18.8 gal.
x .75 = 14 gal.
- 2 = -7 gpm
#4
12x 2Dx1( x 1 = 3340 c.i.
- 231 = 1(.(o gal.
x .75 = 13 gal.
- 2 = m
HGI #1 — Total drainage flows from maximum of 4 fixtures
31 gpm
#1
x x x = c.i.
- 231 = gal.
x .75 = gal.
- 2 = gpm
#2
x x x = c.i.
- 231 = al.
x .75 = gal.
- 2 = gpm
#3
x x x = c.i.
- 231 = al.
x .75 = gal.
- 2 = gpm
#4
x x x = c.i.
- 231 = al.
x .75 = gal.
- 2 = gpm
HGI #2 — Total drainage flows from maximum of 4 fixtures
gpm
#1 Hydromechanical Grease Interceptor Size (in gpm)
35
50
75
100 or
greater
#2 Hydromechanical Grease Interceptor Size (in gpm)
35
50
75
100 or
greater
If the calculated size is less than 35 gpm please circle the 35 gpm box.
The Minimum Hydromechanical Grease Interceptor size is 35 gpm as per City of Edmonds
Pretreatment Ordinance.
City may upsize for factors such as low temp/high volume dishwashing, if permitted, or
high oil/grease content on menu, etc.
----------------------------------------(For City use only below this line) -----------------------------------------------
Remarks•
Size Approved: gpm Approved by:
Pretreatment Technician
Date:
[Rev. November 2016]
Gravity Grease Interceptor Sizing Worksheet
Facility Name:
Address:
Suite No.:
• A Gravity Grease Interceptor (GGI) permit is required ($365.00 fee). Contact the
Pretreatment Technician (425-672-5755) if you have any questions regarding this form.
• Per Edmonds City Code the minimum sized GGI permitted is 500 gallons. Maximum sized
unit is 4,000 gallons.
NUMBER OF MEALS SERVED AT PEAK HOUR A =
Based on the total number of seats and average time per meal.
Lounge and bar seating is counted at 20%.
WASTE FLOW RATE (Choose one) B =
• With Dishwashing Machine ...................... 6 gallon flow
• Without Dishwashing Machine ................. 5 gallon flow
• Single Service Kitchen* ............................. 2 gallon flow
• (Food Waste Disposer ........................ add 1 gallon flow)
RETENTION TIMES (Choose one)
• Commercial Kitchen Dishwasher .............. 2.5 hours
• Single Service Kitchen* .............................. 1.5 hours
STORAGE FACTORS (Choose one)
• Full Service Kitchen 0-12 hour operation: ........... 1
• Full Service Kitchen 12-20 hour operation: ......... 2
• Full Service Kitchen 24 hour operation: ............... 3
• Single Service Kitchen*: ......................................... 1.5
• (Alternate factor for occasional use kitchen .......... __)
C=
1®
Minimum Interceptor Size (liquid capacity) A x B x C x D=
*A single service kitchen refers to a restaurant where disposable dishware is used and
dishwashing operations are therefore greatly reduced.
----------------------------------------(For City use only below this line)
Remarks:
Size Approved:
gal. Approved by:
Pretreatment Technician
Date:
[Rev. November 2016]
Permit Coordinator Guidelines for Permit Issuance
Gravity Grease Interceptor:
1. Use a Side Sewer application, but write in "Gravity Grease Interceptor" and mark out "Side
Sewer".
2. Check completeness of applicant's submittal packet.
• Grease Removal Equipment Application form.
• Kitchen Floor Plan: be sure all plumbing fixtures are called out and piping is shown.
• Site Plan: be sure the site plan shows the location of the interceptor, manhole covers,
depth of sewer line, etc.
• Gravity Grease Interceptor Sizing Worksheet, signed by the Pretreatment Technician.
• Interceptor specifications: there should be cut sheets showing dimensions.
3. Route site plan to Engineering to check location and manhole cover requirements, etc.
4. Route site plan to Planning if landscaping will be disrupted.
5. After receiving approval from Engineering and Planning (if needed), issue permit, collect
fee, and log in book. Send one copy to the Pretreatment Technician at the Treatment Plant
and put one copy in the street address file.
6. The Pretreatment Technician sends an email to the Development Services Technician after
inspection approval.
Hydromechanical Grease Interceptor:
1. Applicant submits the hydromechanical grease interceptor sizing worksheet signed by the
Pretreatment Technician.
2. Permit issued over the counter.
3. Forward a copy of the hydromechanical grease interceptor permit to the Pretreatment
Technician and put one copy in the street address file.
4. The Pretreatment Technician sends an email to the Development Services Technician after
inspection approval.
[Rev. November 2016]