Chapter 13.30
GRAVITY GREASE INTERCEPTOR (GGI)/HYDROMECHANICAL GREASE INTERCEPTOR (HGI) RULES AND REGULATIONS
Sections:
13.30.010 Purpose, policy and administration.
13.30.020 Definitions.
13.30.040 Applicability.
13.30.050 Requirements for compliance.
13.30.060 Discharge criteria.
13.30.070 Requirements for gravity grease interceptors (GGIs)/hydromechanical grease interceptors (HGIs).
13.30.080 Gravity grease interceptor (GGI) construction.
13.30.090 Service, inspection and monitoring ports.
13.30.110 Hydromechanical grease interceptors (HGIs).
13.30.111 Interceptor pumping and cleaning (GGI/HGI).
13.30.112 Grease interceptor (GGI/HGI) operational permit requirements.
13.30.113 Required reporting.
13.30.114 Gravity grease interceptors (GGIs)/hydromechanical grease interceptors (HGIs) treatment products.
13.30.115 Mobile treatment processes.
13.30.116 Facility closure.
13.30.117 Monitoring, inspection and entry.
13.30.118 Confidentiality and proprietary information.
13.30.119 Suspension of service.
13.30.120 Fees.
13.30.121 Violations and penalties.
13.30.122 Remedies not exclusive.
13.30.010 Purpose, policy and administration.
A. Purpose. The purpose of this chapter is the regulation of the installation, maintenance, generation and disposal of GGI/HGI waste for the protection of the public owned treatment works (POTW) and the environment.
B. Policy. The objective of this chapter is to reduce the operational and maintenance costs of the POTW by preventing the accumulation of grease within the collection system and additional treatment at the wastewater treatment plant. This chapter shall apply to all users of the POTW in the city of Gig Harbor and to users outside the city who, by contract or agreement with the city, are users of the city’s POTW.
C. Administration. Except as otherwise provided herein, the WWTP supervisor (supervisor) or his/her designee shall administer, implement, and enforce the provisions of this chapter. (Ord. 1185 § 4, 2010; Ord. 1107 § 7, 2007; Ord. 1087 § 6, 2007).
13.30.020 Definitions.
Unless otherwise expressly stated or the context clearly indicates a different intention, the following terms shall, for the purpose of this chapter, have the meanings indicated in this section:
A. “Adequately sized GGI” shall mean an interceptor that at no time allows discharge of fats, oils and grease (FOG) in excess of 100 milligrams per liter (mg/l) concentrations, solids or otherwise has not been found by the supervisor to be contributing grease in quantities sufficient to cause POTW line stoppages or necessitate increased maintenance on the POTW.
B. “Adequately sized HGI” shall mean an interceptor that at no time allows discharge of fats, oil and grease (FOG) in excess of 100 milligrams per liter (mg/l) concentrations, solids or otherwise has not been found by the supervisor to be contributing grease in quantities sufficient to cause POTW line stoppages or necessitate increased maintenance on the POTW.
C. “Administrative authority” shall be the WWTP supervisor.
D. “Approved” shall mean accepted as satisfactory under the terms of this chapter and given formal and official sanction by the administrative authority.
E. “Beverage/coffee stand” means a facility that serves primarily coffee, tea, juices and other nonalcoholic beverages.
F. “Biological pretreatment service” shall mean the application of any additive or enzyme or the use of any other biological means to digest waste in an interceptor that discharges into a public sewer system within the city.
G. “Lawful discharge” shall mean the introduction of waste into a POTW.
H. “Disposal” shall mean the discharge, deposit, injection, dumping, spilling, leaking or placing of any solid or semi-solid GGI/HGI waste and/or sewage into or on any land or water so that such waste or any constituent thereof may enter the environment or be emitted into the air or discharged into any waters, including ground waters.
I. “Disposal facility” shall mean a facility at which liquid waste, including but not limited to GGI/HGI waste and sewage, is received, processed, or treated in a manner compliant with all applicable federal, state, and local regulations.
J. “Disposal facility operator” shall mean an individual who is authorized to accept or reject waste at a disposal facility, and who is authorized to sign a trip ticket, regardless of actual title.
K. “Disposal site” shall mean a permitted site or part of a site at which GGI/HGI waste is processed, treated and/or intentionally placed into or on any land in a manner compliant with all applicable federal, state, and local regulations, and at which site said waste will remain after closure.
L. “Drainage fixture units (DFUs)/fixture units” shall mean a quantity in terms of which the load-producing effects on the plumbing system of different kinds of plumbing fixtures are expressed as referenced in UPC per Table 7-3 of this chapter.
M. “Emulsifiers” and/or “de-emulsifiers” shall mean any substance or substances which, when added or placed into a GGI or HGI system, will form an oily substance to a milky fluid in which the fat globules are in a very finely divided state and are held in suspension, allowing it to be released into the POTW.
N. “Existing facility” shall mean any building, structure, facility, or installation from which there is or may be a discharge of waste, the construction of which started before the adoption of this chapter.
O. “Fats” shall mean substances that are primarily fatty acid esters of the alcohol glycerol, also called acylglycerols, neutral fats, natural fats, or glycerides. They are the major components of deposit, or storage of fats in plant and animal cells, especially in the adipose (or fat) cells of vertebrates. This term may include any synthesized substance of a like nature.
P. “Food courts” shall mean areas predominantly found in shopping centers or amusement parks and festivals where several food service establishments having different owners may be sharing seating space and/or plumbing facilities.
Q. “Food service establishment” shall mean any facility that cuts, cooks, bakes, prepares or serves food, which disposes of food-related wastes and/or which has a local, state, and/or federal food service permit.
R. “Garbage grinder” shall mean any device which shreds or grinds up solid or semisolid food waste materials into smaller portions for discharge into the POTW.
S. “Generator” shall mean a business/owner that causes, creates, generates, stores, or otherwise produces waste from on-site process operations, whether domestically or commercially generated, or as a byproduct of some domestic or nondomestic activity. The generator is responsible for assuring that the produced waste is disposed of in accordance with all federal, state and local disposal regulations.
T. “Grease” shall mean fats, waxes, free fatty acids, calcium and magnesium soaps, mineral oils and certain other non-fatty material from animal or vegetable sources, or from hydrocarbons of petroleum origins, commonly found in wastewater from food preparation and food service. Grease may originate from, but not be limited to, discharges from scullery sinks, pot and pan sinks, dishwashing machines, soup kettles and floor drains located in areas where grease-containing materials may exist.
U. “Gravity grease interceptor (GGI)” shall mean a water-tight receptacle receiving and retaining waste containing fats, oils and grease from food service establishments, and in all cases shall be located outside place of business or any structure. Minimum size shall be 750 gallons. Additional sizing criteria set forth in this chapter and the current adopted plumbing code.
V. “Hydromechanical grease interceptor (HGI)” shall mean a water-tight receptacle receiving and retaining waste containing fats, oils and grease from food service establishments. The HGI is generally located inside a business or structure. Sizing criteria are set forth in this chapter and the current adopted plumbing code.
W. “Incompatible wastes” shall mean wastes that have different processing, storage or disposal requirements, or whose mixture would inhibit the proper disposal or treatment of each type of waste, or wastes that if mixed may cause a dangerous chemical or physical reaction, including, but not limited to, GGI waste and HGI waste, and septic tank waste, seepage and hazardous waste, or any combination or combinations thereof.
X. “Inspection port” shall mean openings, with easily opened covers designed to allow inspectors quick access to each compartment of the grease interceptor, and the effluent from the grease interceptor. A monitoring port is an inspection port large enough to allow temporary installation of monitoring devices such as samplers, strip recorders, flow meters, or other such measuring and/or monitoring devices.
Y. “Inspector” shall mean the supervisor of the POTW and person or persons designated and under the instruction and supervision of the supervisor who is assigned to investigate compliance and detect violations of this chapter.
Z. “Interceptor” may mean GGI or HGI depending on its use.
AA. “Living quarters” shall mean a facility, or an area of a facility, where a person or family has a distinct living area, which includes individual kitchen and bath facilities, utilized solely by that single person or family.
BB. “Manager” shall mean the person, regardless of actual title, immediately on site at a location conducting, supervising, managing, or representing the activities of a generator, a transporter or a disposer.
CC. “New facility” shall mean:
1. Any building, structure, facility, or installation from which there is (or may be) a discharge of waste, the construction of which commenced after the adoption of this chapter; provided, that:
a. The building, structure, facility, or installation as constructed, remodeled or modified is located on a site at which no other source is located; or
b. The building, structure, facility, or installation as constructed, remodeled or modified totally replaces the process or production equipment that causes the discharge of waste at an existing course; or
c. The production processes or wastewater generating processes of the building, structure, facility or installation as constructed, remodeled or modified are substantially independent of an existing source at the same site. In determining whether these are substantially independent factors such as the extent to which the new facility is integrated with the existing plant, and the extent to which the new facility is engaged in the same general type of activity as the existing source, should be considered.
d. Refer to GHMC 13.30.040(C) for exemptions.
DD. “NPDES” shall mean National Pollutant Discharge Elimination System as administered by the Washington State Department of Ecology.
EE. “Oil and grease” shall mean any material, but particularly biological lipids and mineral hydrocarbons, recovered as a substance soluble in an organic extracting solvent using an appropriate analytical method approved under 40 CFR 136. It also includes other material extracted by the solvent from an acidified sample and not volatilized during the extraction procedure.
FF. “Permittee” shall mean a person issued a permit under this chapter, including any agent, servant, or employee of the permittee.
GG. “POTW” shall mean public owned treatment works, which shall include all collection, transmission and treatment facilities.
HH. “Reasonable hours” shall mean any time during which a facility is open for business to the public. It shall also include those times when a facility is closed to the public when a manager, employees, and/or contractors are present at the facility and involved in cleanup or food preparation, or any other business activity.
II. “Seepage” is defined as liquid that is allowed to ingress or egress from a tank or piping under existing natural pressures through cracks or imperfections.
JJ. “Sewage” shall mean the liquid and water-carried domestic or industrial wastes from dwellings, commercial establishments, industrial facilities and institutions, whether treated or untreated. The terms “waste” and “wastewater” shall be deemed as sewage by definition.
KK. “Shall not” shall prohibit.
LL. “Spill” shall mean the unpermitted, incidental or intentional loss or unauthorized discharge of grease interceptor (GGI/HGI) waste, seepage, any other liquid waste, a chemical (hazardous or nonhazardous), or any other material that has the potential to contaminate any surface or ground water or in any other manner such that the waste is not legally disposed of.
MM. “Shopping center” shall mean a group of commercial establishments built on a site that is planned, developed, owned, and managed as an operation unit for sale or lease, with on-site parking in definite relationship to the types and sizes of stores at the site.
NN. “Strip mall” shall mean a line of stores fronted by uniform parking spaces or a small common parking lot. For the purposes of this chapter, strip malls and shopping centers are considered to be the same.
OO. “Transporter” shall mean a hauler who transfers waste from the site of a generator to an approved site for disposal or treatment. The transporter is responsible for assuring that all federal, state and local regulations are followed regarding waste transport.
PP. “Trip ticket” shall mean the written, multi-part form used as documentation and required to be in the possession of the generator, transporter, and disposer to document the generation, receipt, transportation, and disposal of grease interceptor (GGI/HGI) waste, seepage, and other liquid wastes enabling legal and proper disposal of hauled GGI/HGI waste, and seepage at a permitted or registered disposal site, and specifying the identity of the generator, transporter, and disposal facility operator of liquid wastes and the volume of grease interceptor (GGI/HGI) waste, seepage, and other liquid wastes disposed.
QQ. “Waste” shall mean the liquid and water-carried domestic or industrial wastes from dwellings, commercial establishments, industrial facilities and institutions, whether treated or untreated. The terms “sewage” and “wastewater” shall be deemed as waste by definition.
RR. “WWTP” shall mean the wastewater treatment plant.
SS. “WWTP supervisor” shall mean the supervisor of the POTW which includes, but is not limited to, the wastewater treatment plant and collection system. (Ord. 1185 § 4, 2010; Ord. 1107 § 7, 2007; Ord. 1087 § 6, 2007).
13.30.040 Applicability.
A. Discharge of Waste. Waste which contains fats, oil and grease shall be discharged into the POTW system only as set forth in this chapter. The following facilities shall discharge all waste from sinks, dishwashers, drains, and any other fixtures through which grease may be discharged, into an adequately sized, properly maintained and functioning gravity grease interceptor (GGI)/hydromechanical grease interceptor (HGI) before the discharge enters the POTW, as well as grease interceptor (GGI/HGI) effluent inspection port. (Note: Dishwasher not allowed on HGI.)
1. Every commercial food preparation and food service facility, including but not limited to bakeries, boardinghouses, butcher shops, cafes, clubhouses, beverage/coffee stands, commercial kitchens, correction facilities (prisons), delicatessens, fat rendering plants, ice cream parlors, hospitals, churches, caterers, meat packing plants, restaurants, schools, slaughter houses, soap factories, and similar facilities, especially where meat, poultry, seafood (excludes fresh fish), dairy products or fried foods are prepared or served.
2. All shopping centers that have food processing facilities.
3. All food courts.
4. All other facilities discharging grease in amounts that, according to this chapter, will, alone or in concert with other substances from the discharges of other facilities in the opinion of the city, have a reasonable chance to impede or stop the flow in the POTW or require additional treatment.
B. Grease Interceptors (GGIs/HGIs) Required. All businesses, including, but not limited to, assisted living facilities, convalescent homes, day nursing and childcare facilities, sanitariums, hotels, maternity homes, motels in which there is a commercial food preparation service, nursing homes, retirement homes, in which food preparation occurs as defined in GHMC 13.30.040(A).
C. Exemptions.
1. Modifications to existing facilities that do not add new buildings or new grease generating activities are exempt from this requirement.
2. Adult family homes and family day care facilities.
3. Facilities with four or less drainage fixture units (DFUs).
D. Grease Interceptors (GGIs/HGIs) Not Required. Interceptors (GGIs/HGIs) shall not be required for single-family residences, duplexes, triplexes, quadplexes, or apartment complexes, unless the city first determines there are discharges from the property that will create problems in the POTW. The determination shall be made based upon an investigation of the property, and a comparison of the content and amount of discharge from the property with the discharges of other properties similar in size and use. Upon a determination that the discharges will create problems in the POTW, the supervisor may require the installation of an adequately sized grease interceptor (GGI/HGI) to treat the discharges.
E. Review to Determine Applicability. All building and plumbing applications shall be reviewed with the submission of the applicant’s plumbing plan to determine the need for an interceptor (GGI/HGI). (Ord. 1185 § 4, 2010; Ord. 1107 § 7, 2007; Ord. 1087 § 6, 2007).
13.30.050 Requirements for compliance.
A. After the effective date of the ordinance adopting this chapter, an existing facility (excepting those existing facilities described in GHMC 13.30.040 as not requiring a grease interceptor (GGI/HGI)) shall be required to install an approved, adequately sized, and properly operated and maintained grease interceptor (GGI/HGI) when any of the following conditions exist:
1. The existing facility is found by the supervisor to be discharging grease in quantities in excess of 100 mg/l fats, oils and grease.
2. The existing facility is remodeling the food preparation or kitchen waste plumbing facilities in such a manner to be subject to a building/plumbing permit issued by the building and fire safety department.
3. The existing facility has an interceptor (GGI/HGI) which allows a discharge of fats, oil or grease in excess of 100 mg/l.
B. The owner of existing facilities equipped with an undersized grease interceptor (GGI/HGI) as verified from data collected by the supervisor verifying interceptor (GGI/HGI) inability to treat discharge flows shall, within 12 months, install an adequately sized grease interceptor (GGI/HGI) in accordance with the requirements of this chapter.
C. Existing facilities that have no or inadequate means of grease treatment shall be required by this chapter to install an adequately sized grease interceptor within 12 months of the identification of such facility by the supervisor.
D. New facilities required by this chapter to maintain a grease interceptor (GGI/HGI) shall install such a unit prior to commencement of discharge to the POTW.
E. Any requests for extensions to installation dates must be made in writing to the supervisor, at least 180 days in advance of the compliance date. The written request shall include the reasons for the grease generator’s failure or inability to comply with the compliance date set forth, the additional time needed to complete the remaining work, and the steps to be taken to avoid future delays. The supervisor shall determine the date for compliance. (Ord. 1185 § 4, 2010; Ord. 1107 § 7, 2007; Ord. 1087 § 6, 2007).
13.30.060 Discharge criteria.
In addition to the prohibitions outlined in GHMC 13.28.170, the following prohibitions shall apply:
A. Where oil and grease are a byproduct of food preparation and/or cleanup, reasonable efforts shall be made to separate waste oil and grease into a separate container for proper disposal. Except as contained in byproducts of food preparation and/or cleanup, waste oil and grease shall not be discharged to any drains or grease interceptors (GGIs/HGIs). Such waste shall be placed in a container designed to hold such waste and either utilized by industry or disposed of at suitable locations.
B. None of the following agents shall be placed directly into an interceptor, or into any drain that leads to the interceptor:
1. Emulsifiers, de-emulsifiers, surface active agents, enzymes, degreasers, or any type of product that will liquefy grease interceptor wastes;
2. Any substance that may cause excessive foaming in the POTW; or
3. Any substance capable of passing the solid or semi-solid contents of the interceptor to the POTW.
C. The influent to interceptors (GGIs/HGIs) shall not exceed 140 degrees Fahrenheit (140º F). The temperature at the influent inspection port shall be considered equivalent to the temperature of the influent.
D. Toilets, urinals, and other similar fixtures shall not discharge through a grease interceptor.
E. All waste shall only enter the grease interceptor through the inlet pipe.
F. Where food waste grinders are installed, the waste from those units shall discharge directly into the building drainage system without passing through a grease interceptor.
G. Discharge of oil and grease in excess of 100 milligrams per liter (mg/l) concentrations are not allowed downstream of GGI/HGI.
H. The Uniform Plumbing Code Section 1014.1.3 additionally prohibits the discharge from “dishwashers” into any HGI unless specifically required or permitted by the authority having jurisdiction.
I. Cleaning of any equipment used in a food service establishment shall be performed using best management practices (BMPs). At no time shall waste from any equipment maintenance be allowed to enter into the storm drain system. If equipment is cleaned utilizing food establishment drains, flow must not exceed rated design flow of the interceptor. No chemical shall be allowed that will emulsify or alter the grease to allow it to pass through the interceptor. If hot water is used it shall not exceed 140 degrees at the inlet of the interceptor. (Ord. 1185 § 4, 2010; Ord. 1107 § 7, 2007; Ord. 1087 § 6, 2007).
13.30.070 Requirements for gravity grease interceptors (GGIs)/hydromechanical grease interceptors (HGIs).
A. All commercial and industrial facilities dealing with fats, oils and grease (FOG) shall, at the permittees’ expense and as required by the supervisor:
1. Provide an adequately sized interceptor (GGI/HGI). Requirements for interceptor (GGI/HGI) sizing and the design criteria are set forth in this section.
a. Zero to four DFUs are exempt.
b. Five through nine DFUs must provide adequately sized and approved HGI based on a three-compartment sink with a less than two-inch trap or trap arm.
c. Ten or more DFUs must install adequately sized and approved GGI.
2. Locate the interceptor (GGI/HGI) in a manner that provides ready and easy accessibility for cleaning and inspection.
3. Unless otherwise specified by the supervisor, service will be performed on an individual basis as specified in each individual operational permit. Hydromechanical grease interceptors (HGIs) require weekly maintenance or at a frequency as determined by the supervisor. Maintain backup copies of trip tickets and a service log, on the premises of the facility, for at least three years.
4. Reports must be available to the supervisor, as defined in GHMC 13.30.113.
5. Allow inspection of the facility and of records by inspectors during reasonable hours.
6. If the supervisor determines that there is a need for installation or upgrading of sample ports or grease interceptors (GGIs/HGIs) on an existing facility, he/she shall direct the generator to install necessary improvements to bring existing facility into compliance.
B. Requirements for Gravity Grease Interceptor/Hydromechanical Grease Interceptor Sizing and Design Criteria.
1. Size, type, and location of GGIs/HGIs shall be in accordance with the manufacturers’ instructions, the requirements of city of Gig Harbor Municipal Code and/or public works standards, and Uniform Plumbing Code.
All grease bearing waste streams shall be routed through an approved grease interceptor, including: three-compartment sinks, pot/pan sinks, soup kettles, hand-washing sinks, dishwashers, mop sinks and floor drains.
2. Applicability. These requirements are applicable to all commercial food service establishments, including those that are undergoing the following:
a. New construction;
b. Interior remodeling to accommodate expansion or operational modifications;
c. Changes of ownership/occupancy or use;
d. Facilities which may be experiencing difficulty in achieving compliance with maintenance and/or wastewater discharge limitations.
3. Sizing Requirements.
a. Sizing methods described herein are intended as guidance in determining GGI/HGI sizes that may afford the POTW a minimum degree of protection against grease and other obstructing materials. Sizing determinations are based on operational data provided by business owners or their contractors. In approving a generator’s plumbing or GGI/HGI design, the city does not accept liability for the failure of a system to adequately treat wastewater to achieve effluent quality requirements specified under this chapter. It is the responsibility of the generator and/or contractors to ensure the appropriate level of treatment necessary for compliance with environmental and wastewater regulations.
b. Tables in formulas found in subsection (B)(4) of this section shall be used to determine adequate gravity grease interceptor/ hydromechanical grease interceptor (GGI/HGI) sizing.
4. Gravity Grease Interceptor (GGI)/Hydromechanical Grease Interceptor (HGI) Sizing Tables in Formulas. It is the responsibility of the generator/owner and his/her contractors to ensure that the wastewater discharged from their facility is in compliance with the city’s discharge limitations. For the purpose of plan review, a general assessment of GGI/HGI design and size will be performed using the following tables in formulas. (These formulas have been demonstrated as industry standards capable of achieving the city’s discharge criteria when systems are maintained in proper conditions.)
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TABLE 7-3 Drainage Fixture Unit Values (DFUs) |
Inch |
mm |
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1-1/4 |
32 |
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1-1/2 |
40 |
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2 |
50 |
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2-1/2 |
65 |
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3 |
80 |
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Plumbing Appliance, Appurtenance, or Fixture |
Min. Size Trap & Trap Arm7 |
Private |
Public |
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|
|
Assembly8 |
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Bathtub or Combination Bath/Shower |
1-1/2" |
2.0 |
2.0 |
|
|
|
Bidet |
1-1/4" |
1.0 |
|
|
|
|
Bidet |
1-1/2" |
2.0 |
|
|
|
|
Clothes Washer, Domestic, Standpipe5 |
2" |
3.0 |
3.0 |
3.0 |
|
|
Dental Unit, Cuspidor |
1-1/4" |
|
1.0 |
1.0 |
|
|
Dishwasher, Domestic, with Independent Drain2 |
1-1/2" |
2.0 |
2.0 |
2.0 |
|
|
Drinking Fountain or Water Cooler |
1-1/4" |
0.5 |
0.5 |
1.0 |
|
|
Food Waste Grinder, Commercial |
2" |
|
3.0 |
3.0 |
|
|
Floor Drain, Emergency |
2" |
|
0.0 |
0.0 |
|
|
Floor Drain (for additional sizes see Section 702) |
2" |
2.0 |
2.0 |
2.0 |
|
|
Shower, Single-Head Trap |
2" |
2.0 |
2.0 |
2.0 |
|
|
Multi-Head, Each Additional |
2" |
1.0 |
1.0 |
1.0 |
|
|
Lavatory, Single |
1-1/4" |
1.0 |
1.0 |
1.0 |
|
|
Lavatory, in Sets of Two or Three |
1-1/2" |
2.0 |
2.0 |
2.0 |
|
|
Washfountain |
1-1/2" |
|
2.0 |
2.0 |
|
|
Washfountain |
2" |
|
3.0 |
3.0 |
|
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Mobile Home, Trap |
3" |
12.0 |
|
|
|
|
Receptor, Indirect Waste1,3 |
1-1/2" |
|
|
See footnote 1,3 |
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Receptor, Indirect Waste1,4 |
2" |
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|
See footnote 1,4 |
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Receptor, Indirect Waste1 |
3" |
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|
See footnote 1 |
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Sinks |
|
|
|
|
|
|
Bar |
1-1/2" |
1.0 |
|
|
|
|
Bar2 |
1-1/2" |
|
2.0 |
2.0 |
|
|
Clinical |
3" |
|
6.0 |
6.0 |
|
|
Commercial with Food Waste2 |
1-1/2" |
|
3.0 |
3.0 |
|
|
Special Purpose2 |
1-1/2" |
2.0 |
3.0 |
3.0 |
|
|
Special Purpose |
2" |
3.0 |
4.0 |
4.0 |
|
|
Special Purpose |
3" |
|
6.0 |
6.0 |
|
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Kitchen, Domestic2 (with or without food waste grinder and/or dishwasher) |
1-1/2" |
2.0 |
2.0 |
|
|
|
Laundry2 (with or without discharge from a clothes washer) |
1-1/2" |
2.0 |
2.0 |
2.0 |
|
|
Service or Mop Basin |
2" |
|
3.0 |
3.0 |
|
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Service or Mop Basin |
3" |
|
3.0 |
3.0 |
|
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Service, Flushing Rim |
3" |
|
6.0 |
6.0 |
|
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Wash, Each Set of Faucets |
|
|
2.0 |
2.0 |
|
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Urinal, Integral Trap 1.0 GPF2 |
2" |
2.0 |
2.0 |
2.0 |
|
|
Urinal, Integral Trap Greater than 1.0 GPF |
2" |
2.0 |
2.0 |
2.0 |
|
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Urinal, Exposed Trap2 |
1-1/2" |
2.0 |
2.0 |
2.0 |
|
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Water Closet, 1.6 GPF Gravity Tank6 |
3" |
3.0 |
4.0 |
6.0 |
|
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Water Closet, 1.6 GPF Flushometer Tank6 |
3" |
3.0 |
4.0 |
6.0 |
|
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Water Closet, 1.6 GPF Flushometer Valve6 |
3" |
3.0 |
4.0 |
6.0 |
|
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Water Closet, Greater than 1.6 GPF Gravity Tank6 |
3" |
4.0 |
6.0 |
8.0 |
|
|
Water Closet, Greater than 1.6 GPF Flushometer Valve6 |
3" |
4.0 |
6.0 |
8.0 |
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1 Indirect waste receptors shall be sized based on the total drainage capacity of the fixtures that drain therein to, in accordance with Table 7-4. |
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2 Provide a two-inch (51 mm) minimum drain. |
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3 For refrigerators, coffee urns, water stations, and similar low demands. |
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4 For commercial sinks, dishwashers, and similar moderate or heavy demands. |
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5 Buildings having a clothes-washing area with clothes washers in a battery of three or more clothes washers shall be rated at six fixture units each for purposes of sizing common horizontal and vertical drainage piping. |
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6 Water closets shall be computed as six fixture units when determining septic tank sizes based on Appendix K of this code. |
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7 Trap sizes shall not be increased to the point where the fixture discharge may be inadequate to maintain their self-scouring properties. |
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8 Assembly (Public Use (See Table 4-1)). |
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Size of Grease Interceptor |
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Diameter of Grease Waste Pipe |
Maximum Full Pipe Flow (gpm)2 |
One-Minute Drainage Period (gpm) |
Two-Minute Drainage Period (gpm) |
|
2" |
20 |
20 |
10 |
|
3" |
60 |
75 |
35 |
|
4" |
125 |
150 |
75 |
|
5" |
230 |
250 |
125 |
|
6" |
375 |
500 |
250 |
|
1 For interceptor sizing by fixture capacity see the example below. |
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2 One-quarter-inch (0.250) slope per foot based on Manning’s formula with friction factor N = 0.012. |
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EXAMPLE FOR SIZING HYDROMECHANICAL INTERCEPTOR(S) USING FIXTURE CAPACITY
Step 1: Determine the flow rate from each fixture.
[Length] X [Width] X [Depth] / [231] = Gallons X [.75 fill factor] / [Drain Period (1 min. or 2 min.)]
Step 2: Calculate the total load from all fixtures that discharge into the interceptor.
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|
|
|
Size of Grease Interceptor |
|
|
Fixtures |
Compartments |
Load (gallons) |
One-Minute Drainage Period (gpm) |
Two-Minute Drainage Period (gpm) |
|
Compartment size |
|
|
|
|
|
24'' x 24'' x 12'' |
2 |
44.9 |
|
|
|
Hydrant |
|
3 |
|
|
|
Rated Appliance |
|
2 |
|
|
|
Total |
|
49.9 |
50 |
25 |
5. Gravity Grease Interceptor. Where sizing formulas result in determination of an exterior grease interceptor (GGI) less than 750 gallons in capacity, minimum size shall be 750 gallons.
The size of a grease interceptor shall be determined by the following formula:
|
DFUs (1, 3) |
Interceptor Volume (2) |
|
10 |
750 gallons |
|
21 |
750 gallons |
|
35 |
1,000 gallons |
|
90 |
1,250 gallons |
|
172 |
1,500 gallons |
|
216 |
2,000 gallons |
|
307 |
2,500 gallons |
|
342 |
3,000 gallons |
|
428 |
4,000 gallons |
|
576 |
5,000 gallons |
|
720 |
7,500 gallons |
|
2,112 |
10,000 gallons |
|
2,640 |
15,000 gallons |
|
* DFUs are calculated using Uniform Plumbing Code Table 7-3 |
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Notes: |
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(1) |
The maximum allowable DFUs plumbed to the kitchen drain lines that will be connected to the grease interceptor. |
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(2) |
This size is based on: DFUs, the pipe size from this code; Table 7-5; Useful Tables for Flow in Half-full Pipes (ref: Mohinder Nayyar Piping Handbook, 3rd Edition 1992). Based on 30-minute retention time (ref.: George Tchobanoglous and Metcalf & Eddy. Wastewater Engineering Treatment, Disposal and Reuse, 3rd Ed. 1991 and Ronald Crites and George Tchobanoglous. Small and Decentralized Wastewater Management Systems, 1998). Rounded up to nominal interceptor volume. |
|
(3) |
When the flow rate of directly connected fixture(s) or appliances(s) have no assigned DFU values, the additional grease interceptor volume shall be based on the known flow rate (gpm) multiplied by 30 minutes. |
Additional information and assistance about sizing and installation can be obtained through the building and fire safety department and/or the public works operations/engineering divisions of the city of Gig Harbor.
6. Alternate Sizing Formulas/Proposals. Facilities that propose the use of alternate sizing techniques and/or procedures that result in specifications that differ from calculated requirements (or are less than the minimum 750-gallon requirement) must submit formulas and other bases to the supervisor to support proposed grease interceptor (GGI/HGI) size/installation. Submission should also provide documentation of the generator’s ability to meet effluent quality requirements. The generator’s proposal must be signed by an engineer licensed in the state of Washington. The supervisor shall make the final decision on any installation.
Notable Exceptions: Drains that receive “clear waste” only, such as from ice machines, condensate from coils and drink stations, may be plumbed to the sanitary system without passing through the grease interceptor.
7. Generator/Owner Responsibilities. It is the responsibility of the generator to ensure compliance with the city of Gig Harbor’s discharge limitations.
Hazardous wastes, such as acids, bases, grease emulsifying agents, strong cleaners, pesticides, herbicides, heavy metals, paint, solvents, gasoline or other hydrocarbons shall not be disposed of where they would go through GGIs/HGIs. If commercial dishwashers are discharged through a GGI, care must be taken in system design. Dishwashers use detergents and elevated water temperatures that will melt grease. If the GGI is either too small or too close to the commercial dishwasher, grease may pass through the GGI/HGI and into the collection system. Relocation and upsizing may be required to comply with city discharge requirements. (Dishwashers may not discharge through a hydromechanical grease interceptor (HGI) without the supervisor’s approval as per UPC Section 1014.1.3).
Generators/owners are responsible for maintaining GGIs/HGIs in continuous proper working condition. Further, generators are responsible for inspecting, repairing, replacing, or installing apparatus and equipment as necessary to ensure proper operation and function of GGIs/HGIs and compliance with discharge limitations at all times.
GGIs/HGIs shall be maintained with a minimum frequency as specified in the individual operational permit to ensure proper function. (Maintenance frequency assumes proper sizing and installation consistent with this requirement.) The GGI/HGI shall be maintained more frequently if needed to meet the city’s discharge criteria. If, in cooperation with the supervisor, frequency of cleaning can be extended, without degradation of GGI/HGI effluent, an alternative schedule can be approved. Records of maintenance are required to be maintained on site for three years.
Enzymes, solvents, and emulsifiers are not permitted, as they will only change the form of grease, allowing it to be carried out of the GGI/HGI with the wastewater and deposited in the collection system (POTW). Biological treatment systems must be pre-approved by the supervisor. These systems will not alleviate the necessity for inspection and proper maintenance. (Ord. 1185 § 4, 2010; Ord. 1107 § 7, 2007; Ord. 1087 § 6, 2007).
13.30.080 Gravity grease interceptor (GGI) construction.
A. Any generator responsible for discharges requiring a GGI shall, at his/her expense and as required by the city, provide plans and specifications for equipment and facilities of a design type and design capacity approved by the public works operations/engineering division of the city of Gig Harbor. The GGI must be in compliance with the Gig Harbor Municipal Code and public works standards, and the Uniform Plumbing Code. The generator shall locate the interceptor in a manner that provides easy accessibility for cleaning, maintenance and inspection. Representatives of the public works operations/engineering division shall inspect and approve the interceptor during construction and upon completion before any service connections are made.
B. The GGI shall be constructed with a minimum of two chambers or shall have a minimum of two tanks in series. All tanks shall be coated with an approved material to maintain structural integrity externally for inflow prevention and internally to protect degradation of structure from hydrogen sulfide and/or compounds that may damage integrity (see public works standards for approved coatings).
C. There must be inlet and outlet tees made of minimum six-inch schedule 40 PVC installed. The inlet tee should extend down approximately one-third the depth of the interceptor (GGI) from the top and the outlet tee should be located 12 inches off of the bottom of the interceptor.
D. Construction of items listed herein in accordance herewith or in accordance to the city’s specifications shall not constitute a defense to unlawful discharge and shall not limit the generator’s liability for any surcharge stated in this chapter. (Ord. 1185 § 4, 2010; Ord. 1107 § 7, 2007; Ord. 1087 § 6, 2007).
13.30.090 Service, inspection and monitoring ports.
A. Except for HGIs, each interceptor (GGI) shall be located outside of a building or structure in an area accessible for service, and so installed and connected that it shall be at all times easily accessible for inspection, and for cleaning and removal of the intercepted waste. Inlet inspection ports, interceptor inspection ports, and effluent monitoring ports shall be in areas where vehicles may not temporarily block access to inspection. The use of ladders or the removal of bulky equipment or stored materials in order to inspect inlet flow, inspect or service interceptors, or sample interceptor effluent shall be unacceptable. Inspection ports and monitoring ports shall be located so as to allow inspectors quick and easy access to the inlet flow, each compartment of the interceptor, and the effluent from the interceptor. The location of all interceptors, inspection ports, and monitoring ports shall meet the approval of the supervisor and shall be shown on the approved building plans.
B. Standard manhole ports with risers shall be installed over each inlet, outlet and crossover connections of the interceptor (GGI), but in either case all parts of the interceptor (GGI) shall be easily accessible for cleaning and visual inspection. A monitoring port shall be provided for ease in sampling the treated effluent from the interceptor (GGI). The port shall be installed according to the public works standards, or as approved by the supervisor. The port shall be installed and maintained at the generator’s expense. A generator shall properly place, monitor, and maintain the monitoring port so that wastewater samples taken from the monitoring port are representative of wastewater leaving the interceptor. It shall be unlawful for a grease generator to divert sewage around a monitoring point into the POTW. (Ord. 1185 § 4, 2010; Ord. 1107 § 7, 2007; Ord. 1087 § 6, 2007).
13.30.110 Hydromechanical grease interceptors (HGIs).
A. In the event that an outside gravity grease interceptor (GGI) is not practical or not required, a hydromechanical grease interceptor (HGI) may be installed subject to the approval of the supervisor. In addition to the regular requirements of gravity grease interceptors, hydromechanical grease interceptors are subject to these additional requirements.
B. General Requirements.
1. The lid shall be secured to the body and easily accessible and removable with the use of common tools. No special tools shall be needed to remove the lid. HGI must be watertight and be constructed of materials not subject to excessive corrosion or decay. The HGI shall be coated so as to be resistant to corrosion. Refer to city of Gig Harbor Public Works Standards Chapter 5, List of Drawings for Specifications.
2. Baffle systems and all other internal pieces shall be removable to facilitate cleaning and replacement, but must be in place at all other times.
3. The lid shall cover the deep seal HGI. The deep seal HGI shall be constructed so as to eliminate the possibility of sewer gas entering the kitchen area.
4. HGIs and interceptors that are installed above ground must be equipped with an influent flow regulator and an effluent valve assembly that allows for sample collection.
C. Installation Requirements.
1. The HGI may be set on the floor, partially recessed in the floor with top flush with the floor, or fully recessed below the floor to suit piping and structural conditions, as acceptable by the building and fire safety department of the city.
2. There shall be sufficient clearance for the removal of the HGI cover for cleaning and inspection.
3. The HGI shall not be installed in a waste line from a garbage grinder. Any garbage grinder waste shall bypass the HGI.
4. A suitable flow control fitting shall be installed ahead of the HGI in the waste line beyond the fixture and as close as possible to the underside of the lowest fixture. When wastes of two or more sinks or fixtures are combined to be used by one HGI, a single flow control fitting shall be used.
5. Air intake for flow control shall either terminate under the sink drain board as high as possible to prevent overflow, or shall terminate in a return bend at the same height and on the outside of the building. (The UPC requires devices to be readily accessible and in a visible location.)
6. To retain water and prevent siphoning, all HGIs shall have a vented waste, sized in accordance with the UPC.
7. With the approval of the fire and building safety department, one HGI may be used to serve multiple fixtures if the fixtures are located close together and the HGI is sized to meet the combined flow of all the fixtures.
D. Maintenance Requirements.
1. Hydromechanical grease interceptors (HGIs) shall be serviced weekly or as needed on an individual basis. This will be determined by the amount of grease produced and a maximum measurement of no more than three inches accumulation on the top of the HGI or 25 percent of the total liquid volume is occupied by floating solids or sediment. In addition, discharge does not exceed the 100 mg/L limit. After accumulated grease and waste has been removed, the HGI shall be thoroughly inspected to make certain that inlet, outlet, and air relief ports are clear of obstructions.
2. Grease and other waste removed from the HGI shall not be introduced into any drain, sewer, or natural body of water. The waste shall be placed in proper containers for proper disposal. It shall not be mixed with “edible” grease. Grease and waste removed from an HGI shall not be disposed of in such a manner so as to become food for animals or humans.
3. The grease generator shall maintain adequate documentation that the HGI is appropriately cleaned and inspected as referenced in GHMC 13.30.111, Interceptor pumping and cleaning (GGI/HGI). Hydromechanical grease interceptor waste generators shall meet all applicable federal, state and local requirements regarding the accumulation, generation, and disposal of waste. (Ord. 1185 § 4, 2010; Ord. 1107 § 7, 2007; Ord. 1087 § 6, 2007).
13.30.111 Interceptor pumping and cleaning (GGI/HGI).
A. Required Pumping Frequency.
1. Unless otherwise specified by the supervisor, each interceptor (GGI/HGI) in active use shall be cleaned as specified in the individual operational permit. Each GGI/HGI is reviewed on a case-by-case basis. The frequency may increase or decrease depending upon the need to prevent carry over of grease into the POTW. The supervisor may specify cleaning more frequently when the current pumping schedule is shown to be inadequate. Additional pumping may be required during time periods where increased loading is anticipated. Any grease generator desiring a schedule less frequent than established shall submit a request to the supervisor along with testing (as required by the supervisor) and copies of the cleaning records for the last four interceptor (GGI/HGI) cleanings, including measurements of the thickness of the surface scum/grease layer and sediment.
2. At any time if an inspection finds the interceptor (GGI/HGI) having solids occupying 25 percent or more of the interceptor’s liquid capacity, immediate steps shall be taken by the grease generator to pump out and clean the interceptor. The inspector shall make an evaluation of the advisability of allowing discharge to continue, and may at his or her discretion order an immediate cessation of all discharge from the facility. In any case, the grease interceptor operational permit of the facility may be amended so as to compel more frequent pumping and cleaning of the interceptor (GGI/HGI).
B. All interceptors (GGIs/HGIs) shall be maintained by the grease generator at the grease generator’s expense. If the generator fails to comply with its cleaning schedule or is not adhering to the requirements of this chapter the city shall have the interceptor (GGI/HGI) cleaned and bill the generator for all costs associated with its cleaning.
C. Requirement for Increased Pumping or Servicing. If the supervisor finds that a change in pumping or servicing of an interceptor (GGI/HGI) is necessary for an existing facility to meet the discharge limits stated in this chapter, the supervisor may order a change in pumping or servicing of an interceptor (GGI/HGI). If the supervisor orders a change in the pumping or servicing, then the supervisor shall inform the generator and owner of the new schedule and their responsibility to adhere to the new schedule.
D. Interceptor (GGI/HGI) Maintenance Log.
1. Every generator having a GGI or HGI shall maintain a gravity grease interceptor/hydromechanical grease interceptor maintenance log indicating each pumping or cleaning for the previous 12 months. This log shall include the date, time, amount pumped (removed), hauler and disposal site, and shall be kept in a conspicuous location on the premises of the facility for inspection. Food service establishments shall keep the log posted. Said log shall be made immediately available to any authorized city inspector.
2. A copy of the information required in the maintenance log must be available to the inspector at the time of inspection to be removed and become the city’s record. The inspection period shall run from January 1st through December 31st of each year. Regular inspections will occur twice yearly, or as required by the operational permit. Repeat inspections for those interceptors (GGIs/HGIs) not meeting maintenance requirements will be done 30 days from initial inspection.
E. Cleaning Procedures.
1. The owner or an employee of the facility shall supervise the interceptor (GGI/HGI) cleaning, and shall be physically present and observe the entire cleaning operation and sign the maintenance log as proof.
2. A generator shall cause the liquid waste hauler, transporter, or any other person cleaning or servicing an interceptor (GGI/HGI) to completely evacuate all contents, including grease, floating materials, wastewater, and bottom sludges and solids. Skimming the surface layer of waste material and other partial cleaning of the interceptor (GGI/HGI) or use of any method that does not remove the entire contents of the collection device is prohibited. Removal of the floating materials shall be done prior to removal of other contents. After complete evacuation, the walls, top, and bottom of the interceptor (GGI/HGI) shall then be thoroughly cleaned and the residue removed. Upon completion of the servicing, the manager or their designee of the facility shall make an inspection of the interior of the interceptor (GGI/HGI) and then personally sign the trip ticket. In the case of an HGI, an entry on the maintenance log shall serve as the trip ticket. The manager or their designee shall make an appropriate entry in the facility interceptor maintenance log, and leave a copy of the trip ticket with the log for the inspector to pick up at the next inspection. Food service establishments shall keep all trip tickets posted with their Pierce County health food permit. Said trip tickets and maintenance logs shall be made immediately available to any authorized city inspector.
3. The generator shall prohibit the discharge of liquid, semi-solids, or solids back into an interceptor (GGI/HGI) during and/or after servicing. Decanting or discharging of removed waste back into the interceptor (GGI/HGI) from which the waste was removed or any other interceptor, for the purpose of reducing the volume to be disposed, is prohibited.
4. Each gravity interceptor (GGI) pumped shall be fully evacuated unless the interceptor volume is greater than the tank capacity on the vacuum truck, in which case the transporter shall arrange for additional transportation capacity so that the interceptor is fully evacuated within a 24-hour period following the transporter’s inability to fully evacuate the interceptor.
F. Disposal of Interceptor (GGI/HGI) Waste. All waste removed from each interceptor (GGI/HGI) shall be disposed of at a facility permitted and authorized to receive such waste in accordance with all applicable federal, state, and local regulations. In no way shall the waste be returned to any private or public portion of the POTW, without prior written approval from the supervisor, nor may it be returned to any portion of the POTW not specifically designated by the wastewater collections/treatment supervisor. Additionally, grease removed from an interceptor (GGI/HGI) shall not be recycled so as to become a food product or part of a food product for animal or human consumption.
G. Vacuum Truck Cleaning Service. It shall be unlawful for a grease generator/owner to allow grease waste to be removed from his/her premises by a transporter who does not have all applicable federal, state, or local permits or registrations including a Washington State waste hauler’s permit and city business license. (Ord. 1185 § 4, 2010; Ord. 1107 § 7, 2007; Ord. 1087 § 6, 2007).
13.30.112 Grease interceptor (GGI/HGI) operational permit requirements.
A. It is unlawful for any facility to discharge effluent from a grease interceptor (GGI/HGI) without authorization from the supervisor. Authorization shall be given in the form of a grease interceptor (GGI/HGI) operational permit.
B. No separate application is necessary for a grease interceptor (GGI/HGI) operational permit. The supervisor shall examine the information contained in the application materials for the underlying permit, including, but not limited to, the requirements for GGI/HGI. If it is determined by the supervisor that the proposed discharge is consistent with the provisions of this chapter and any other applicable federal, state, or local requirement or regulation, and the permit fee is paid, a grease interceptor (GGI/HGI) operational permit shall be issued allowing the facility to discharge into the POTW. Each grease interceptor (GGI/HGI) operational permit shall be in effect from issue until the business stops, changes or the supervisor declares a necessity for a change to meet discharge requirements. The terms and conditions of the permit may be subject to modification at any time during the term of the permit as limitations or requirements as identified in this chapter are modified or other just causes exist.
The permittee shall be informed of any proposed changes in the issued permit at least 30 days prior to the effective date of the change(s). Any changes or new conditions in the permit shall include a reasonable time schedule for compliance.
The permit cannot be appealed administratively. (Ord. 1185 § 4, 2010; Ord. 1107 § 7, 2007; Ord. 1087 § 6, 2007).
13.30.113 Required reporting.
All permitted gravity grease interceptor (GGI)/hydromechanical grease interceptor (HGI) waste generators shall, at a frequency and time determined by the supervisor, but in no case less than once per year, make available to the supervisor:
A. Copies of all trip tickets made by liquid waste transporters servicing their GGI/HGI during the reporting period;
B. A copy of the gravity grease interceptor/hydromechanical grease interceptor maintenance log;
C. Any other information required by the grease interceptor (GGI/HGI) operational permit, including analysis of the discharge to the POTW of such waste as the supervisor may require. Such analysis shall be in accordance with requirements of this chapter and Chapter 13.28 GHMC. (Ord. 1185 § 4, 2010; Ord. 1107 § 7, 2007; Ord. 1087 § 6, 2007).
13.30.114 Gravity grease interceptors (GGIs)/hydromechanical grease interceptors (HGIs) treatment products.
A. Use of grease interceptor treatment products, including bacteria, designed to digest grease, is specifically prohibited.
B. Acceptance of such products for use may be considered only where a valid screening test, showing the product’s ability to treat the waste and to produce an effluent in compliance with this chapter, has been performed in accordance with methods outlined by the supervisor.
C. Screening tests for such grease interceptor treatment products shall be designed by the supervisor on a case-by-case basis.
D. The results of screening tests shall be subject to technical review by the supervisor. All costs of screening tests shall be borne by the generator whether or not the product is accepted for use.
E. If a product is accepted for use, each facility shall obtain written permission from the supervisor to use the product.
F. Complete descriptions of the chemical composition of all products must be disclosed to the supervisor.
G. The supervisor may revoke permission to use such products where the effluent from the interceptor or basin in which the product is used fails to meet the requirements of this chapter. (Ord. 1185 § 4, 2010; Ord. 1107 § 7, 2007; Ord. 1087 § 6, 2007).
13.30.115 Mobile treatment processes.
Any person wishing to make use of a mobile treatment process or of an on-site process to clean or service grease interceptors or grit interceptors shall demonstrate the process to the satisfaction of the supervisor. Included with the demonstration shall be a written explanation of the treatment process. Any costs to the city associated with the demonstration, such as, but not limited to, sampling and analysis, shall be recovered. Complete descriptions of the chemical composition of all products must be disclosed to the supervisor along with an MSDS sheet for said product. (Ord. 1185 § 4, 2010; Ord. 1107 § 7, 2007; Ord. 1087 § 6, 2007).
13.30.116 Facility closure.
(Note: Plumbing permit required for any alterations of plumbing system.)
A. When a facility with a grease interceptor (GGI/HGI) closes for business, and is subsequently:
1. Razed or demolished, then any grease interceptor (GGI/HGI) shall be either:
a. Physically removed; or
b. Have all contents pumped out, a straight line plumbed from the inlet to the outlet, and the remainder of the tank filled with soil or sand;
2. Remodeled such that the grease interceptor (GGI/HGI) will not be used, then the grease interceptor or interceptors may be left in place, however:
a. The grease interceptor (GGI/HGI) shall have all contents pumped out, the GGI/HGI cleaned thoroughly, and the grease interceptor left dry and empty; and
b. Be re-plumbed as to bypass the existing grease interceptor or interceptors, either by straight through or by bypassing methods, while leaving the empty GGI/HGI in place for possible future utilization by another business; or
3. Replaced with a type of business that will not utilize the grease interceptor (GGI/HGI), then that business may have any existing grease interceptor or interceptors:
a. Physically removed; or
b. Re-plumbed as to bypass the existing grease interceptor or interceptors, either by straight through or by bypassing methods, while leaving the empty HGI in place for possible future utilization by another business; or
c. Re-plumbed with a straight line from the inlet to the outlet, and the remainder of the grease interceptor or interceptors filled with soil or sand. In all instances, the owner of the premises shall appropriately inform the supervisor and perform the closure at such a time so as to permit an inspector to be physically present during the removal or filling of the interceptor (GGI). (Ord. 1185 § 4, 2010; Ord. 1107 § 7, 2007; Ord. 1087 § 6, 2007).
13.30.117 Monitoring, inspection and entry.
A grease generator shall, during reasonable business hours, allow the inspectors access to all parts of the premises for purposes of inspection, sampling, records examination and copying, and the performance of additional duties. The right of access of the supervisor shall be considered at least as extensive as the authority provided under GHMC 13.28.040. (Ord. 1185 § 4, 2010; Ord. 1107 § 7, 2007; Ord. 1087 § 6, 2007).
13.30.118 Confidentiality and proprietary information.
Information and data obtained from reports, surveys, grease interceptor (GGI/HGI) permits, and monitoring programs, and from the supervisor inspection and sampling activities, and any other information submitted to the supervisor pursuant to this chapter, shall become public record at least to the extent provided by the Public Disclosure Act, Chapter 42.17 RCW. (Ord. 1185 § 4, 2010; Ord. 1107 § 7, 2007; Ord. 1087 § 6, 2007).
13.30.119 Suspension of service.
A. The administrative authority and/or city may suspend water or sewer service when such suspension is necessary, in the opinion of the administrative authority, in order to stop an actual or threatened discharge which:
1. Presents or may present an imminent or substantial endangerment to the health or welfare of persons or the environment;
2. Causes stoppages or excessive maintenance to be performed to prevent stoppages in the sanitary sewer collection system;
3. Causes interference to the POTW; or
4. Causes the city to violate any condition of its NPDES permit.
B. Any person notified of a suspension of the water or sewer service shall immediately stop or eliminate the discharge. In the event of a failure of the person to comply voluntarily with the suspension order, the city shall take such steps as deemed necessary, including immediate termination of water or sewer service, to prevent or minimize damage to the POTW system or sewer connection or endangerment to any individuals. The city shall reinstate the water or sewer service when such conditions causing the suspension have passed or been eliminated. A detailed written statement submitted by the grease generator describing the cause(s) of the harmful discharge and the measure(s) taken to prevent any future occurrence shall be submitted to the city within 15 days of the date of occurrence.
C. In addition to prohibiting certain conduct by natural persons, it is the intent of this chapter to hold a corporation or association legally responsible for prohibited conduct performed by an agent acting in behalf of a corporation or association. (Ord. 1185 § 4, 2010; Ord. 1107 § 7, 2007; Ord. 1087 § 6, 2007).
13.30.120 Fees.
The city shall adopt fees for administration of this chapter by separate resolution. (Ord. 1185 § 4, 2010; Ord. 1107 § 7, 2007; Ord. 1087 § 6, 2007).
13.30.121 Violations and penalties.
A. This chapter shall be enforced according to the procedures set forth in Chapter 12.17 GHMC. The person authorized to enforce this chapter pursuant to Chapter 12.17 GHMC is the supervisor or his/her designee.
B. It is unlawful for any grease generator to discharge into the POTW in any manner that is in violation of this chapter or of any condition set forth in this chapter. Additionally, a person commits an offense if the person causes or permits the plugging or blocking of, or otherwise interferes with or permits the interference of, a grease interceptor (GGI/HGI) or the POTW, including alteration or removal of any flow constricting devices so as to cause flow to rise above the design capacity of the interceptor (GGI/HGI).
C. No person and/or facility shall discharge grease in excess of 100 mg/l to the POTW. If such discharge occurs, the person or facility shall be considered in violation of, this chapter and subject to the remedies described herein. This includes nonpermitted facilities.
D. A permittee is liable to the city for any expense, loss, or damage occasioned by the city for reason of appropriate cleanup and proper disposal of said waste materials. (Ord. 1185 § 4, 2010; Ord. 1107 § 7, 2007; Ord. 1087 § 6, 2007).
13.30.122 Remedies not exclusive.
The remedies set forth in this chapter are not exclusive. The city council may authorize the city attorney to take any legally authorized actions against a noncompliant permittee or generator, including, but not limited to, all applicable remedies enumerated in this chapter and available under applicable law. (Ord. 1185 § 4, 2010; Ord. 1107 § 7, 2007; Ord. 1087 § 6, 2007).