HomeMy WebLinkAboutCBOA 02-22-2024 Item 5b - Proposed Municipal Code update concerning separating fats, oils, and grease Item 5b
Construction Board of Appeals
Agenda Report
For Agenda of: 2/22/2024
Item Number: 5b
FROM: Michael Loew, Deputy Director/Chief Building Official
Prepared By: Michael Loew, Deputy Director/Chief Building Official
SUBJECT: UTILITIES DEPARTMENT PRESENTATION ON MUNICIPAL CODE
UPDATES
RECOMMENDATION
There is no action for the Construction Board of Appeals to take since this is not a public
hearing item.
DISCUSSION
The Utilities Department is seeking public input while developing proposed changes to
the municipal code. Staff from the Utilities Department will provide the Construction
Board of Appeals an informational presentation and ask for public input during the
regular meeting. Members of the board will be able to discuss the presentation and
provide staff with input. Members of the public will also have an opportunity to provide
feedback during public comment.
This presentation is being delivered to the Construction Board of Appeals since some
proposed municipal code changes will be enforced during the permit application review
and inspection process. The presentation will cover, but may not be limited to the
following topic:
Additional requirements above and beyond the California Plumbing Code for separating
fats, oils, and grease prior to entering the city sewer system:
A formula that considers customer traffic for sizing
prohibited devices
maintenance requirements
inspection and best management practice details
exceptions and triggers for replacement of existing interceptors
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2/22/2024 staff presentation
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Utilities Department
Draft Municipal Code Updates
February 22, 2024
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Fats, Oils, and Grease Discharge Control
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2/22/2024 staff presentation
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Why FOG Control is Important
Protects the wastewater collections system
Protects the wastewater treatment plant
Reduces the amount of sanitary sewer overflows
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What is likely to change?
1.Sizing requirements of grease control devices (GCDs)
2.GCD replacement requirements
3.Maintenance requirements
4.Prohibited devices
5.Kitchen best management practices (BMPs)
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How do we currently size
traps and interceptors?
1.Calculate size by flow rate.
a.(Volume of drainage fixtures (cu/in) / 231)(0.75) divided by either 1-
or 2-minute drainage period
2.Example:
a.3-compartment sink – fairly standard
iii.(12 in x 12 in x 18 in) (3)
b.Kitchen also has a prep sink
iii.12 in x 12 in x 18 in
c.These two things are plumbed to the grease control device (GCD)
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Example
1.(12" x 12" x 18")(4)
a.5,184 / 231 = 22 gallons
b.22 x 0.75 = 16.5 gallons
c.Divide by a 1-min drainage period because they are putting it
beneath the 3-compartment sink
2.They could buy a Schier GB1 GCD 20 gpm unit, which holds 70 lbs of
grease
3.This does not take into account the type of food that is being prepared,
the number of customers service, or the cleaning frequency
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New Sizing Requirements
Size needs to be calculated by flow rate
according to the California Plumbing Code
(CPC) and grease capacity.
•Grease capacity is calculated by the type
of food (grease factor) X meals/customers
per day X days between cleaning
•The approved GCD will meet both the
minimum flow rate per the CPC and the
minimum grease capacity.
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Calculating Grease Capacity
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Calculating Grease Capacity
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Calculating Grease Capacity
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GCD Replacement
Requirements
•They are structurally failing
•During any new construction, tenant improvement,
or remodels completed after July 1, 2024
•FSE caused or contributed to a FOG-related
blockage, build-up, or increased maintenance of a
city sewer
•FSE has improperly installed or sized a GCD
•Current sizing requires servicing more frequently
than 30 days
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Maintenance and Reporting
Requirements
1.Hydromechanical grease interceptors shall be cleaned at least once
every 30 days
2.Non-conforming gravity grease interceptors shall be cleaned at least
once every 3 months
3.May require more frequent cleaning if FOG layer plus the settled
sludge layer exceeds 25% or the total liquid depth of the GCD
4.Records shall include:
a.Date of cleaning service
b.Name of hauler
c.Copy of invoices at the time of inspection
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Prohibited Devices
•Gravity Grease Interceptors
•GCDs built from concrete
•GCDs built from metal, including
metal GCDs with Acid Resistant
Enamel or Epoxy Coatings
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Kitchen BMPs
•Dry wipe cooking pots and other equipment prior
to washing to remove fats, oil, and grease
•Install screens in all floor and sink drains
•Maintain vent hood and filters
•Wash all floor mats, grills, and greasy kitchen
equipment in a drainage system connected to a
GCD
•Recycle food scraps
•Place “No Grease” stickers in dishwashing area
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Utilities Department
Draft Municipal Code Updates
http://www.slocity.org/utcodeupdates
Chris Lehman | Deputy Director, Wastewater clehman@slocity.org
We are looking forward to hearing your feedback!
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