SAN LUIS OBISPO COUNTY AIR POLLUTION CONTROL DISTRICT
RULE 432 - PERCHLOROETHYLENE DRY CLEANING OPERATIONS
(Adopted 5/24/95; Revised 11/13/96)
The provisions of this Rule shall apply to any person who owns or operates perchloroethylene dry cleaning equipment.
For the purposes of this Rule, the following definitions shall apply:
- "Adsorptive Cartridge Filter": A replaceable cartridge filter that contains diatomaceous earth or
activated clay as the filter medium.
- "Cartridge Filter": A replaceable cartridge filter that contains one of the following as the filter
medium: paper, activated carbon, or paper and activated carbon. A cartridge filter contains no diatomaceous earth
or activated clay. Cartridge filters include, but are not limited to: standard filters, split filters, "jumbo"
filters, and all carbon polishing filters.
- "Closed-Loop Machine": Any dry cleaning equipment, sometimes known as dry-to-dry, in which washing,
extraction, and drying are all performed in the same single unit and which recirculates perchloroethylene-laden
vapor through a primary control system with no exhaust to the atmosphere during the drying cycle. A closed-loop
machine may allow for venting to the ambient air through a fugitive control system after the drying cycle is complete
and only while the machine door is open.
- "Co-Located with a Residence": Sharing a common wall, floor, or ceiling with a residence. For the
purposes of this definition, "residence" means any dwelling or housing which is owned, rented, or occupied
by the same person for a period of 180 calendar days or more excluding short-term housing such as a motel or hotel
room rented and occupied by the same person for a period of less than 180 calendar days.
- "Converted Machine": An existing vented machine that has been modified to be a closed-loop machine
by eliminating the aeration step, installing a primary control system, and providing for recirculation of the perchloroethylene-laden
vapor with no exhaust to the atmosphere or workroom during the drying cycle. A converted machine may allow for
venting to the ambient air through a fugitive control system after the drying cycle is complete and only while
the machine door is open.
- "Cool-Down": The portion of the drying cycle that begins when the heating mechanism deactivates and
the refrigerated condenser continues to reduce the temperature of the air recirculating through the drum to reduce
the concentration of perchloroethylene in the drum.
- "Date of Compliance": The time from October 1, 1994, until a facility must be in compliance with
the specific requirements of this control measure.
- "Desorption": Regeneration of an activated carbon bed, or any other type of vapor adsorber by removal
of the adsorbed solvent using hot air, steam, or other means.
- "Dip Tank Operations": The immersion of materials in a solution that contains perchloroethylene,
for purposes other than dry cleaning, in a tank or container that is separate from the dry cleaning equipment.
- "District": The San Luis Obispo County Air Pollution Control District.
- "Drum": The rotating cylinder or wheel of the dry cleaning machine that holds the materials being
- "Dry Cleaning Equipment": Any machine, device, or apparatus used to dry clean materials with perchloroethylene
or to remove residual perchloroethylene from previously cleaned materials. Dry cleaning equipment may include,
but is not limited to, a transfer machine, a vented machine, a converted machine, a closed-loop machine, a reclaimer,
or a drying cabinet.
- "Dry Cleaning System": All of the following equipment, devices, or apparatus associated with the
perchloroethylene dry cleaning process: dry cleaning equipment; filter or purification systems; waste holding,
treatment, or disposal systems; perchloroethylene supply systems; dip tanks; pumps; gaskets; piping, ducting, fittings,
valves, or flanges that convey perchloroethylene-contaminated air; and control systems.
- "Drying Cabinet": A housing in which materials previously cleaned with perchloroethylene are placed
to dry and which is used only to dry materials that would otherwise be damaged by the heat and tumbling action
of the drying cycle.
- "Drying Cycle": The process used to actively remove the perchloroethylene remaining in the materials
after washing and extraction. For closed-loop machines, the heated portion of the cycle is followed by cool-down
and may be extended beyond cool-down by the activation of a control system. The drying cycle begins when heating
coils are activated and ends when the machine ceases rotation of the drum.
- "Environmental Training Program": An initial course or a refresher course of the environmental training
program for perchloroethylene dry cleaning operations that has been authorized by the Air Resources Board according
to the requirements of Title 17 of the California Code of Regulations (CCR), Section 93110.
- "Equivalent Closed-Loop Vapor Recovery System": A device or combination of devices that achieves,
in practice, a perchloroethylene recovery performance equal to or exceeding that of refrigerated condensers.
- "Existing Facility": Any facility that operated dry cleaning equipment prior to October 1, 1994.
Facility relocations, within the same district, shall be considered existing facilities for the purposes of this
- "Facility": Any entity or entities which: own or operate perchloroethylene dry cleaning equipment,
are owned or operated by the same person or persons, and are located on the same parcel or contiguous parcels.
- "Facility Mileage": The efficiency of perchloroethylene use at a facility, expressed as the pounds
of materials cleaned per gallon of perchloroethylene used, and calculated for all dry cleaning machines at the
facility over a specified time period.
- "Fugitive Control System": A device or apparatus that collects fugitive perchloroethylene vapors
from the machine door, button and lint traps, still, or other intentional openings of the dry cleaning system and
routes those vapors to a device that reduces the mass of perchloroethylene prior to exhaust of the vapor to the
- "Full-Time Employee": Any person who is employed at the dry cleaning facility and averages at least
30 hours per week in any 90-day period.
- "Gallons of Perchloroethylene Used": The volume of perchloroethylene, in gallons, introduced into
the dry cleaning equipment, and not recovered at the facility for reuse on-site in the dry cleaning equipment,
over a specified time period.
- "Halogenated-Hydrocarbon Detector": A portable device capable of detecting vapor concentrations of
perchloroethylene of 25 parts per million by volume (ppmv) or less and indicating an increasing concentration by
emitting an audible signal or visual indicator that varies as the concentration changes.
- "Liquid Leak": A leak of liquid containing perchloroethylene of more than 1 drop every 3 minutes.
- "Materials": Any wearing apparel, draperies, linens, fabrics, textiles, rugs, leather, and other
goods that are dry cleaned.
- "Muck Cooker": A device for heating perchloroethylene-laden waste material to volatilize and recover
- "New Facility": A facility that did not operate any dry cleaning equipment prior to October 1, 1994.
Facility relocations, within the same district, shall not be considered new facilities for the purposes of this
- "Perceptible Vapor Leak": An emission of perchloroethylene vapor from unintended openings in the
dry cleaning system, as indicated by the odor of perchloroethylene or the detection of gas flow by passing the
fingers over the surface of the system. This definition applies until April 1, 1996.
- "Perchloroethylene": The substance with the chemical formula 'C2C14', also
known by the name 'tetrachloroethylene', which has been identified by the Air Resources Board and listed as a toxic
air contaminant in Title 17 CCR, Section 93000.
- "Perchloroethylene Dry Cleaning" or "Dry Cleaning": The process used to remove soil, greases,
paints, and other unwanted substances from materials with perchloroethylene.
- "Pounds of Materials Cleaned per Load": The total dry weight, in pounds, of the materials in each
load dry cleaned at the facility, as determined by weighing each load on a scale prior to dry cleaning and recording
- "Primary Control System": A refrigerated condenser, or an equivalent closed-loop vapor recovery system
approved by the District.
- "Reclaimer": A machine, device, or apparatus used only to remove residual perchloroethylene from
materials that have been previously cleaned in a separate piece of dry cleaning equipment.
- "Reasonably Available", as it applies to an initial course for the environmental training program,
means that the course is offered within 200 miles of the District boundaries and that all such courses have a capacity,
in the aggregate, that is adequate to accommodate at least one person from each facility in the District required
to certify a trained operator at that time.
- "Refrigerated Condenser": A closed-loop vapor recovery system into which perchloroethylene vapors
are introduced and trapped by cooling below the dew point of the perchloroethylene.
- "Secondary Control System": A device or apparatus that reduces the concentration of perchloroethylene
in the recirculating air at the end of the drying cycle beyond the level achievable with a refrigerated condenser
alone. An "integral" secondary control system is designed and offered as an integral part of a production
package with a single make and model of dry cleaning machine and primary control system. An "add-on"
secondary control system is designed or offered as a separate retrofit system for use on multiple machine makes
- "Self-Service Dry Cleaning Machine": A perchloroethylene dry cleaning machine that is loaded, activated,
or unloaded by the customer.
- "Separator": Any device used to recover perchloroethylene from a water-perchloroethylene mixture.
- "Still": A device used to volatilize and recover perchloroethylene from contaminated solvent removed
from the cleaned materials.
- "Trained Operator": The owner, the operator, or an employee of the facility who holds a record of
completion for the initial course of an environmental training program and maintains her/his status by successfully
completing the refresher courses as required.
- "Transfer Machine": A combination of perchloroethylene dry cleaning equipment in which washing and
extraction are performed in one unit and drying is performed in a separate unit.
- "Vapor Adsorber": A bed of activated carbon or other adsorbent into which perchloroethylene vapors
are introduced and trapped for subsequent desorption.
- "Vapor Leak": An emission of perchloroethylene vapor from unintended openings in the dry cleaning
system, as indicated by a rapid audible signal or visual signal from a halogenated-hydrocarbon detector or a concentration
of perchloroethylene exceeding 50 ppmv as methane as indicated by a portable analyzer. This definition applies
beginning April 1, 1996.
- "Vented Machine": Dry cleaning equipment in which washing, extraction, and drying are all performed
in the same single unit and in which fresh air is introduced into the drum in the last step of the drying cycle
and exhausted to the atmosphere, either directly or through a control device.
- "Waste Water Evaporator": A device that vaporizes perchloroethylene-contaminated waste water through
the addition of thermal or chemical energy, or through physical action.
- "Water-Repelling Operations": The treatment of materials with a water-repellent solution that contains
C. INITIAL NOTIFICATION
- The owner/operator of an existing facility shall provide the District with all of the following information,
in writing by May 24, 1995:
a. The name(s) of the owner and operator of the facility.
b. The facility name and location.
c. Whether or not the facility is co-located with a residence.
d. The number, types, and capacities of all dry cleaning equipment.
e. Any control systems for each dry cleaning machine.
f. For existing facilities only, the gallons of perchloroethylene purchased by the facility during the previous
- A new or modified facility shall provide the information required by Subsection C.1 on an application for Authority
to Construct or Permit to Operate.
- A District may exempt a source from the requirements of Subsection C.1 if the District maintains current equivalent
information on the facility.
The owner/operator shall maintain records for the specified time period, beginning on the applicable date shown
in Column 3 of Table 432-1. These records, or copies thereof, shall be accessible at the facility at all times.
- All of the following records shall be retained for at least 2 years or until the next District inspection of
the facility, whichever period is longer.
a. For each dry cleaning machine, a log showing the date and the pounds of materials cleaned per load.
b. Purchase and delivery receipts for perchloroethylene. For only those facilities with solvent tanks that are
not directly filled by the perchloroethylene supplier upon delivery, the date(s) and gallons of perchloroethylene
added to the solvent tank of each dry cleaning machine.
c. The completed leak inspection checklists required by Subsection F.2 and the operation and maintenance checklists
required by Subsection F.1.a.
d. For liquid leaks, perceptible vapor leaks, or vapor leaks that were not repaired at the time of detection,
a record of the leaking component(s) of the dry cleaning system awaiting repair and the action(s) taken to complete
the repair. The record shall include copies of purchase orders or other written records showing when the repair
parts were ordered and/or service was requested.
- For dry cleaning equipment installed after October 1, 1994, the manufacturer's operating manual for all components
of the dry cleaning system shall be retained for the life of the equipment.
- The original record of completion for each trained operator shall be retained during the employment of that
person. A copy of the record of completion shall be retained for an additional period of two years beyond the separation
of that person from employment at the facility.
E. ANNUAL REPORTING
The owner/operator shall maintain an annual report. The facility owner or operator shall furnish this annual
report to the District on or before February 1. The annual report shall include all of the following:
- A copy of the record of completion for each trained operator.
- The total of the pounds of materials cleaned per load and the gallons of perchloroethylene used for all solvent
additions in the reporting period.
- The average facility mileage, determined from all solvent additions in the reporting period, as follows:
F. GOOD OPERATING PRACTICES
Equipment Requirements and Summary of Compliance Times
for Existing and New Facilities
EQUIPMENT REQUIREMENTS -----------DATE OF COMPLIANCE--------------
Leak Check and Repair, Operation
and Maintenance Requirements
and Dip Tank Requirements
|Converted Closed-Loop Machine with a Primary Control System
May 24, 1995
May 24, 1995
May 24, 1995
April 1, 1996
April 1, 1996
April 1, 1996
OR - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - -
|Closed-Loop Machine with a Primary Control System
May 24, 1995
May 24, 1995
May 24, 1995
April 1, 1996
October 1, 1998
April 1, 1996
|NEW FACILITIES Commencing Operation Prior to April 1, 1996
|Closed-Loop Machine with a Primary Control System
3 mos. following commencement
|NEW FACILITIES Commencing Operation on or after April 1, 1996.
|Closed-Loop Machine with a Primary Control System and Secondary Control System
3 mos. following commencement
The owner/operator shall not operate dry cleaning equipment after the applicable dates shown in Column 5 and
Column 6 of Table 432-1, unless all of the following requirements are met:
- Operation and Maintenance Requirements. The trained operator, or his/her designee, shall operate and
maintain all components of the dry cleaning system in accordance with the requirements of this Section and the
conditions specified in the facility's operating permit beginning on the applicable date specified in Column 5
of Table 432-1. For operations not specifically addressed, the components shall be operated and maintained in accordance
with the manufacturer's recommendations.
a. The District shall provide an operation and maintenance checklist to the facility. Each operation and maintenance
function and the date performed shall be recorded on the checklist. The operation and maintenance checklist provided
by the District shall include, at a minimum, the following requirements:
- Refrigerated condensers shall be operated to ensure that exhaust gases are recirculated until the air-vapor
stream temperature on the outlet side of the refrigerated condenser, downstream of any bypass, is less than or
equal to 45oF (7.2oC).
- Primary control systems, other than refrigerated condensers, shall be operated to ensure that exhaust gases
are recirculated until the perchloroethylene concentration in the drum is less than or equal to 8,600 ppmv at the
end of the drying cycle, before the machine door is opened and any fugitive control system activates.
- Vapor adsorbers used as a primary control system or secondary control system shall be operated to ensure that
exhaust gases are recirculated at the temperature specified by the District, based on the manufacturer's recommendations
for optimum adsorption. These vapor adsorbers shall be desorbed according to the conditions specified by the District
in the facility's operating permit, including a requirement that no perchloroethylene vapors shall be routed to
the atmosphere during routine operation or desorption.
- During the interim period between compliance with this Subsection and compliance with the requirements of Subsection
G, an existing facility with a transfer machine or a vented machine shall operate any existing carbon adsorber,
which functions during the drying cycle, to meet the following requirements:
i. Desorption shall be performed periodically, at the frequency specified by the District. The frequency, at
a minimum, shall be each time all dry cleaning equipment exhausted to the device has cleaned a total of three pounds
of materials for each pound of activated carbon. Desorption shall be performed with the minimum steam pressure
and air flow capacity specified by the District.
ii. Once desorption is complete, the carbon bed shall be fully dried according to the manufacturer's instructions.
iii. No vented perchloroethylene vapors shall bypass the carbon adsorber to the atmosphere.
- Cartridge filters and adsorptive cartridge filters shall be handled using one of the following methods.
i. Drained in the filter housing, before disposal, for no less than: 24 hours for cartridge filters and 48 hours
for adsorptive cartridge filters. If the filters are then transferred to a separate device to further reduce the
volume of perchloroethylene, this treatment shall be done in a system that routes any vapor to a primary control
system, with no exhaust to the atmosphere or workroom.
ii. Dried, stripped, sparged, or otherwise treated, within the sealed filter housing, to reduce the volume of
perchloroethylene contained in the filter.
- A still, and any muck cooker, shall not be allowed to exceed 75 percent of its capacity, or an alternative
level recommended by the manufacturer. A still, and any muck cooker, shall be cooled to 100oF (38oC)
or less before being emptied or cleaned.
- Button and lint traps shall be cleaned each working day and the lint placed in a tightly sealed container.
- All parts of the dry cleaning system where perchloroethylene may be exposed to the atmosphere or workroom shall
be kept closed at all times except when access is required for proper operation and maintenance.
- Waste water evaporators shall be operated to ensure that no liquid perchloroethylene or visible emulsion is
allowed to vaporize.
- Leak Check and Repair Requirements. The trained operator, or her/his designee, shall inspect the dry
cleaning system for liquid leaks and perceptible vapor leaks beginning on the applicable date shown in Column 5
of Table 432-1. The trained operator, or her/his designee, shall inspect the dry cleaning system for vapor leaks
instead of perceptible vapor leaks beginning April 1, 1996. The District shall provide a leak inspection checklist
to the facility. The trained operator, or her/his designee, shall record the status of each component on the checklist.
a. The dry cleaning system shall be inspected at least once per week for liquid leaks and:
b. Any liquid leak, perceptible vapor leak, or vapor leak that has been detected by the operator shall be noted
on the checklist and repaired according to the requirements of this Subsection. If the leak is not repaired at
the time of detection, the leaking component shall be physically marked or tagged in a manner that is readily observable
to a District inspector.
- For perceptible vapor leaks, beginning on the applicable date shown in Column 5 of Table 432-1 until April
- For vapor leaks, beginning April 1, 1996, using one of the following techniques:
i. A halogenated-hydrocarbon detector.
ii. A portable gas analyzer or an alternative method approved by the District.
c. Any liquid leak, perceptible vapor leak, or vapor leak detected by the District, which has not been so noted
on the checklist and marked on the leaking component of the dry cleaning system, shall constitute a violation of
this Section. For enforcement purposes, the District shall:
d. Any liquid leak or vapor leak shall be repaired within 24 hours of detection.
- Identify the presence of a perceptible vapor leak based on the odor of perchloroethylene or the detection of
gas flow by passing the fingers over the surface of the system.
- Identify the presence of a vapor leak by determining the concentration of perchloroethylene with a portable
i. According to ARB Test Method 21.
ii. Measured 1 cm. away from the dry cleaning system.
- If repair parts are not available at the facility, the parts shall be ordered within two working days of detecting
such a leak. Such repair parts shall be installed within five working days after receipt. A facility with a leak
that has not been repaired by the end of the 15th working day after detection shall not operate the dry cleaning
equipment, until the leak is repaired, without a leak-repair extension from the District.
- A District may grant a leak-repair extension to a facility, for a single period of 30 calendar days or less,
if the District makes these findings:
i. The delay in repairing the leak could not have been avoided by action on the part of the facility.
ii. The facility used reasonable preventive measures and acted promptly to initiate the repair.
iii. The leak would not significantly increase perchloroethylene exposure near the facility.
iv. The facility is in compliance with all other requirements of this Section and has a history of compliance.
- Environmental Training Requirements. The facility shall have one or more trained operators beginning
on the applicable date shown in Column 6 of Table 432-1.
a. A trained operator shall be the owner, the operator, or another employee of the facility, who successfully
completes the initial course of an environmental training program to become a trained operator. Evidence of successful
completion of the initial course shall be the original record of completion issued pursuant to Title 17 CCR, Section
93110. The trained operator shall be a full-time employee of the facility. Except for the provisions of Subsection
F.3.c.2, one person cannot serve as the trained operator for two or more facilities simultaneously.
b. Each trained operator shall successfully complete the refresher course of an environmental training program
at least once every three years. Evidence of successful completion of each refresher course shall be the date of
the course and the instructor's signature on the original record of completion.
c. If the facility has only one trained operator and the trained operator leaves the employ of the facility,
the facility shall:
- Notify the District in writing within 30 calendar days of the departure of the trained operator.
- Obtain certification for a replacement trained operator within 3 months, except that a trained operator who
owns or manages multiple facilities may serve as the interim trained operator at two of those facilities simultaneously
for a maximum period of 4 months, by which time each facility must have its own trained operator.
- If the District determines that the initial course of an environmental training program is not reasonably available,
the District may extend the certification period for a replacement trained operator until 1 month after the course
is reasonably available.
The owner/operator shall not operate dry cleaning equipment after the applicable date shown in Column 7 of Table
432-1, unless the following requirements are met:
- Prohibited Equipment. The owner/operator shall not operate any of the following types of dry cleaning
equipment after the applicable date shown in Column 7 of Table 432-1.
a. A transfer machine, including any reclaimer or other device in which materials that have been previously
dry cleaned with perchloroethylene are placed to dry, except a drying cabinet that meets the requirements of Subsection
b. A vented machine.
c. A self-service dry cleaning machine.
- Required Equipment. The owner/operator of each new or existing facility shall meet the applicable requirements
of Table 432-1 as follows:
a. For an existing facility:
b. A new facility shall install, operate, and maintain the required equipment shown in Column 1 of Table 432-1
for new facilities. The applicable requirements shall be determined based on the date the facility commences operation
of the dry cleaning equipment.
- On or before October 1, 1995, choose either Option 1 or Option 2 of Table 432-1 and notify the District of
- Comply with the requirements of Option 2, notwithstanding her/his choice of Option 1, if the facility does
not meet the applicable requirements for Option 1 on or before April 1, 1996.
- Install, operate, and maintain the required equipment for the option chosen, as shown in Column 1 of Table
432-1 for existing facilities.
- Specifications for Required Equipment. Required equipment shall meet the following specifications:
a. A primary control system shall:
b. A converted machine shall meet all of the following requirements, as demonstrated on-site to the District, either
upon conversion or prior to compliance with the requirements of Subsection G.2.a.
- Operate during both the heated and cool-down phases of the drying cycle to reduce the mass of perchloroethylene
in the recirculating air stream.
- Not exhaust to the atmosphere or workroom.
- Not require the addition of any form of water to the primary control system that results in physical contact
between the water and perchloroethylene.
- For refrigerated condensers only:
i. Be capable of achieving an outlet vapor temperature, downstream of any bypass, of less than or equal to 45oF
(7.2oC) during cool-down; and
ii. Have a graduated thermometer with a minimum range from 0oF (-18oC) to 150oF
(66oC), which measures the temperature of the outlet vapor stream, downstream of any bypass of the condenser,
and is easily visible to the operator.
- For equivalent closed-loop vapor recovery systems:
i. Use a technology that has been demonstrated, pursuant to the requirements of Section I, to achieve a perchloroethylene
concentration of 8,600 ppmv or less in each test.
ii. Have a device that measures the perchloroethylene concentration, or a demonstrated surrogate parameter,
in the drum at the end of each drying cycle, before the machine door is opened and any fugitive control system
activates, and indicates if the concentration is above or below 8,600 ppmv. This device shall be installed such
that the reading is easily visible to the operator.
- All process vents that exhaust to the atmosphere or workroom during washing, extraction, or drying shall be
- The converted machine shall use an appropriately-sized primary control system to recover perchloroethylene
vapor during the heated and cool-down phases of the drying cycle.
i. A refrigerated condenser shall be considered appropriately sized, for a machine converted on or after May
4, 1994, if all of the following conditions are met:
a) The water-cooled condensing coils are replaced with refrigerant-cooled condensing coils.
b) The compressor of the refrigerated condenser shall have a capacity, in horsepower (hp) that is no less than
the minimum capacity, determined as follows:
ii. A refrigerated condenser shall be considered appropriately sized, for a machine converted prior to May 4, 1994,
if the conditions a, or b below are met:
(a) The refrigerated condenser shall meet the specifications for new conversions in Subsection G.3.b.2.i.
iii. An equivalent closed-loop vapor recovery system shall be appropriately sized for the conversion of a vented
machine if the system does not extend the total drying time by more than five minutes to meet the specifications
of Subsection G.3.a.5.
The converted machine shall operate with no liquid leaks and no vapor leaks. Any seal, gasket, or connection
determined to have a liquid leak or vapor leak shall be replaced.
c. A secondary control system shall:
(b) The refrigerated condenser shall achieve, and maintain for 3 minutes, an outlet vapor temperature, measured
downstream of the condenser and any bypass of the condenser, of less than or equal to 45oF (7.2oC)
within 10 minutes of the initiation of cool-down.
Specifications for Other Equipment. A drying cabinet shall:
- Be designed to function with a primary control system or be designed to function as a combined primary control
system and secondary control system that meets all of the applicable requirements of this Section.
- Not exhaust to the atmosphere or workroom.
- Not require the addition of any form of water to the secondary control system that results in physical contact
between the water and perchloroethylene.
- Use a technology that has been demonstrated, pursuant to the requirements of Section I, to achieve a perchloroethylene
concentration in the drum of 300 ppmv or less in each test.
- Have a holding capacity equal to or greater than 200 percent of the maximum quantity of perchloroethylene vapor
expected in the drum prior to activation of the system.
- For add-on secondary control systems only, the system shall be sized and capable of reducing the perchloroethylene
concentration in the drum from 8,600 ppmv or greater to 300 ppmv or less in the maximum volume of recirculating
air in the dry cleaning machine and all contiguous piping.
a. Be fully enclosed.
b. Be exhausted via one of the following methods:
- To a control system that has been demonstrated, pursuant to the requirements of Section I, to achieve a perchloroethylene
concentration of 100 ppmv or less in each test, measured at the outlet without dilution.
- To a control system that reduces the concentration of perchloroethylene in a closed system with no exhaust
to the atmosphere or workroom.
H. WATER-REPELLING AND DIP TANK OPERATIONS
No person shall perform water-repelling or dip tank operations, after the applicable date shown in Column 8
of Table 432-1, unless all of the following requirements are met:
- All materials to be treated with perchloroethylene water-repelling solutions shall be treated in a closed-loop
machine, a converted machine, or a dip tank.
- For dip tank operations:
a. The dip tank shall be fitted with a cover that prevents the escape of perchloroethylene vapors from the tank
and shall remain covered at all times, except when materials are placed in and removed from the dip tank or while
the basket is moved into position for draining.
b. After immersion, the materials shall be drained within the covered dip tank until dripping ceases.
c. All materials removed from a dip tank shall be immediately placed into a closed-loop machine or a converted
machine for drying and not removed from the machine until the materials are dry.
I. EQUIPMENT TESTING
For a given design, a single test program shall be conducted, in accordance with the following procedures, to
meet the specifications in Subsections G.3 and G.4. The person or organization conducting the test program shall
prepare a written test plan that describes, in detail, the dry cleaning machine and control systems being tested,
the test protocol, and the test method.
- Test Program and Scope. A minimum of three tests shall be conducted for each test program on each control
system design. All tests for a single test program shall be conducted on a single dry cleaning machine.
a. Test results for a primary control system design, or an add-on secondary control system design, may be applied
to a different make/model of dry cleaning machine if the equipment designer or facility demonstrates, to the satisfaction
of the District, that:
b. Test results for an integral secondary control system design may not be applied to a different make/model of
dry cleaning machine.
- The test results would be representative of the performance of the control system design on the different make/model
of dry cleaning machine.
- The control system design is properly sized for the maximum volume of recirculating air in the dry cleaning
machine during the drying cycle.
- Test Conditions. Testing shall be conducted under normal operating conditions, unless otherwise specified.
a. For primary control systems and secondary control systems, each test shall be conducted during the cleaning
of one load of materials.
b. A primary control system shall be tested on a closed-loop machine, or a converted machine, or a converted machine,
without a secondary control system.
- The machine shall be filled to no less than 75 percent of its capacity with materials for each test.
- The weight of materials shall be recorded for each test.
c. A secondary control system shall be tested on a closed-loop machine.
d. For a control system on the exhaust of a drying cabinet, each test shall be conducted following the placement
of materials cleaned with perchloroethylene in the drying cabinet. The materials shall be transferred to the drying
cabinet and testing shall begin no later than 15 minutes after the end of the washing and extraction process.
- An integral secondary control system shall be tested with the primary control system operating normally.
- An add-on secondary control system shall be tested independent of a primary control system and the initial
perchloroethylene concentration in the drum shall be 8,600 ppmv or greater.
- The drying cabinet shall be filled to no less than 50 percent of its capacity with materials for each test.
- The weight of materials shall be recorded for each test.
- Test Method. Equipment shall be tested in accordance with the following methods:
a. For primary control systems and secondary control systems:
- The temperature of the air in the drum shall be measured and recorded continuously during the entire drying
cycle, including the operation of the secondary control system.