Molly Moon's Pretreatment Review CommentsCity of Edmonds Wastewater Pretreatment Program
200 2nd Ave S., Edmonds, WA 98020
Office: (425) 771-023 7 Mobile: (425) 218-3282
Plan Review Comments
Plan Check BLD2022-0289 Date: March 24, 2022
Project Name/ Address: Molly Moon's Ice Cream @ Main Street Commons
Contact Person/Phone/Email: Steve Carney (applicant) steve@statemech.net
Reviewer: Michael Derrick, WWTP; Michael.derrick(dedmondswa.14ov
The subject application has been reviewed. Below are the reviewer's comments.
The drawings (BLD2022-0289 Plumbing Plan 3.7.2022_3.43.27_PM2722415) have been
reviewed and approved as they pertain to the fixtures shown connecting to the Grease
Interceptor (trap).
The applicant is required to complete the attached "E36 HGI and GGI Permit Submittal
Requirements" and email it to Michael.derrick(a),edmondswa.i!ov for approval.
#E36 - City 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: Refer to Fee Schedule available on the City website.
INSTRUCTIONS FOR THE PERMITTEE:
1. Complete the "Grease Removal Equipment Application" form (attached).
2. Contact the Pretreatment Technician (office: 425-771-0237 ext. 1357; mobile: 425-218-3282;
email: Michael.Derrick(d),edmondswa.gov) 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 5th 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.
[Revised 1/7/2022]
HYDROMECHANICAL GREASE INTERCEPTOR
REQUIREMENTS
NOTE: THE PURPOSE OF THIS HANDOUT IS TO ASSIST THE PUBLIC IN COMPLYING WrrH DETAILED PERMIT SUBMUTAL
REQUIREMENTS. rr IS NOT A COMPLETE LIST OF PERMrr 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.
[Revised 1/7/2022]
GRAVITY GREASE INTERCEPTOR REQUIREMENTS
INFORMATION
downstream i%nina and the public sewers stem. GGI's are required for restaur ts, commercial
kitchens, schoo kitchens, grocery stores, hospitals, and other facilities w re FOG may be
introduced into th sewage system and which do not meet criteria tyusea ndoor HGI. GGI's
are sized according the accompanying worksheet.
The minimum sized Gr vi Grease Interce for er Ci Code isns.
NOTE: A food waste dis sal unit may be connected to a GI, however, due to higher
sediment loading, more frequ t cleaning will be required. holesale rindin and disposal
0 food waste into the interce to or sewers stem is orbidd n. All fixtures and drains, except
for restroom fixtures, should be coXnected to the GGI.
1) Each food service business shall be Nlely resp nsible for the cost of the GGI installation,
inspection, cleaning and maintenance.
2) Businesses shall contract with an approv grease hauler to perform cleaning. Pumping
services shall include the complete rem of all contents, including floating materials,
wastewater and bottom solids. Decanti g or d charging of liquid waste back into the grease
interceptor is strictly prohibited. GGI caning sh 1 include removal of solids from the walls,
floors, baffles, and all pipe work.
3) Each business shall be responsib for maintaining t GGI in good functioning order. It is
recommended that the busines inspect the GGI after i has been pumped out to ensure that
all fittings, pipes, and baffles re in good operating conditi n.
4) The business shall maintai records of the date and time of 1 cleaning and maintenance and
shall make this recor available for inspection on dema The City's Pretreatment
Technician may perfo periodic unscheduled inspections of G 's and maintenance records
to assure complian to the code. Failure to clean and mainta' the GGI may result in
Notices of Violat' n, fines, penalties, and other civil actions as desc ' ed in the City Code. If
a failure to mai ain a GGI leads to partial or complete blockage of th city sewer system, or
adversely aff cts the treatment or transmission capabilities of the W tewater Treatment
/be
ire excessive maintenance by the city, the discharger responsi e of the facilities
ect to the remedies herein, including cost recovery by thecity.
5) d maintenance shall be performed on a routine schedule such at the total
aptured grease and settled solid material never displaces more than 5% of the
e of the unit. The cleaning frequency shall be at least once every thre months
ernate schedule is approved by the Pretreatment Technician.
[Revised 1/7/2022]
CITY OF EDMONDS
Grease Removal Equipment Application
Business Name:
Address:
Business Owner:
Contact Person/Title:
Days/Hours of Operation:
Date Submitted:
Mailing Address:
Phone:
Suite No.:
Total Number of Meals Served Per Peak Hour (assume all seats filled):
Number of Seats: Dining: Lounge/Bar: Banquet Rooms: _ Deck/Patio:
Building Occupancy Permit Capacity: Health Dept. Permit Capacity
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.)
What proportion, if any, of the dishware used is of the disposable type?
How is waste oil/grease handled, stored, and recycled/disposed?
Estimate gallons of waste oil/grease produced per month:
If recycled, by which company?
How are vent hoods cleaned and where does the cleaning waste go?
Contact the Pretreatment Technician at 425-771-0237 ext. 1357 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.
[Revised 1/7/2022]
Hydromechanical Grease Interceptor Sizing Worksheet
Facility Name:
Address:
Suite No.:
• A Hydromechanical Grease Interceptor (HGI) plumbing permit is required ($165.00 fee).
Contact the Pretreatment Technician (425-771-0237 ext. 1357) 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
x x x = c.i.
- 231 = gal.
x .75 = gal.
- 2 = gpm
#2
x x x = c.i.
- 231 = gal.
x .75 = gal.
- 2 = gpm
#3
x x x = c.i.
- 231 = gal.
x .75 = gal.
- 2 = gpm
#4
x x x = c.i.
1- 231 = gal.
I x .75 = gal.
- 2 = gpm
HGI #1— Total drainage flows from maximum of 4 fixtures
gpm
#1
x x x = c.i.
- 231 = gal.
x .75 = gal.
- 2 = gpm
#2
x xx = c.i.
- 231 = gal.
x .75 = gal.
- 2 = gpm
#3
x x x = c.i.
- 231 = gal.
x .75 = gal.
- 2 = gpm
#4
x x x = c.i.
- 231 = gal.
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: Date:
Pretreatment Technician
[Revised 1/7/2022]
Gravity Grease Interceptor Sizing Worksheet
ty Name:
Suite No.:
• A Grav Grease Interceptor (GGI) permit is required ($365.00 fee). Contact t
Pretreatm nt Technician (425-771-0237 ext. 1357) if you have any questions gar
this
form.
• Per Edmonds it
Code the minimum sized GGI permitted is 500 gallon Maximum sized
unit is 4,000 ga ons.
NUMBER OF MEAL SERVED AT PEAK HOUR
Based on the total number of at
and average time per meal.
Lounge and bar seating is count at 20%.
WASTE FLOW RATE (Cho se one)
• With Dishwashing Machine ...................... 6 gallon w
• Without Dishwashing Machi ................. 5 gallo ow
• Single Service Kitchen* ............................ 2 gal n flow
• (Food Waste Disposer .................. .... add 1 Ion 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 o eration: ..... .... 1
• Full Service Kitchen 12-20 ho operation: ........ 2
• Full Service Kitchen 24 hou operation: ...............
• Single Service Kitchen*: . ...................................... 1.
• (Alternate factor for oc sional use kitchen ..........
A x
*A single service Ytchen refers to a restaurant where di
dishwashing ope tions are therefore greatly reduced.
------------------- --------------------(For City use only below this line)
Remarks:
Size Approved:
gal. Approved by:
A=
i
C=
fflo
x C x D =
dishware is used and
Pretreatment Technician
Date:
[Revised 1/7/2022]
Permit Coordinator Guidelines for Permit Issuance
uTaviry crease interceptor:
1. a Side Sewer application, but write in "Gravity Grease Interceptor" and rk out "Side
Sewer .
2. Check co m eteness of applicant's submittal packet.
• Grease Re val Equipment Application form.
• Kitchen Floor : be sure all plumbing fixtures are led out and piping is shown.
• Site Plan: be sure site plan shows the loca ' n of the interceptor, manhole covers,
3
4
5
n
depth of sewer line, etc.
• Gravity Grease Interceptor Si ' Wo eet, signed by the Pretreatment Technician.
• Interceptor specifications: there Id be cut sheets showing dimensions.
Route site plan to Engineering to eck loca ' and manhole cover requirements, etc.
Route site plan to Planning i ndscaping will be *srup
After receiving approva lom Engineering and Plann'
and log in book. d one copy to the Pretreatment T
put one copy i e street address file.
The Pre ment Technician sends an email to the De
insp ion approval.
(if needed), issue permit, collect fee,
c inician at the Treatment Plant and
Technician after
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.
[Revised 1/7/2022]