Virginia Law

A. No owner or other person shall use or permit the use of a cold cleaning machine that processes metal parts and contains more than one liter of volatile organic compounds unless the machine complies with this article. The board may make an exception if the owner demonstrates and the board approves in writing that compliance with the article will result in unsafe operating conditions.

1. Immersion cold cleaning machines shall have a freeboard ratio of 0.75 or greater unless the machines are equipped with covers that are kept closed except when parts are being placed into or being removed from the machine.

2. Immersion cold cleaning machines and remote reservoir cold cleaning machines shall:

a. Have a permanent, conspicuous label summarizing the operating requirements in subdivision 3 of this subsection.

b. Be equipped with a cover that shall be closed at all times except during cleaning of parts or the addition or removal of solvent. For remote reservoir cold cleaning machines that drain directly into the solvent storage reservoir, a perforated drain with a diameter of not more than six inches shall constitute an acceptable cover.

3. Cold cleaning machines shall be operated in accordance with the following procedures:

a. Waste solvent shall be collected and stored in closed containers. The closed containers may contain a device that allows pressure relief, but does not allow liquid solvent to drain from the container.

b. Cleaned parts shall be drained at least 15 seconds or until dripping ceases, whichever is longer. Parts having cavities or blind holes shall be tipped or rotated while the part is draining. During the draining, tipping or rotating, the parts shall be positioned so that solvent drains directly back to the cold cleaning machine.

c. Flushing of parts using a flexible hose or other flushing device shall be performed only within the freeboard area of the cold cleaning machine. The solvent spray shall be a solid fluid stream, not an atomized or shower spray.

d. The owner shall ensure that when the cover is open the cold cleaning machine is not exposed to drafts greater than 40 meters per minute (132 feet per minute), as measured between 1 and 2 meters (3.3 and 6.6 feet) upwind and at the same elevation as the tank lip.

e. Sponges, fabric, wood, leather, paper products and other absorbent materials shall not be cleaned in the cold cleaning machine.

f. When a pump-agitated solvent bath is used, the agitator shall be operated to produce a rolling motion of the solvent with no observable splashing of the solvent against the tank walls or the parts being cleaned. Air agitated solvent baths may not be used.

g. Spills during solvent transfer and use of the cold cleaning machine shall be cleaned up immediately, and the wipe rags or other sorbent material shall be immediately stored in covered containers for disposal or recycling.

h. Work area fans shall be located and positioned so that they do not blow across the opening of the degreaser unit.

i. The owner shall ensure that the solvent level does not exceed the fill line.

4. No person shall use, sell, or offer for sale for use in a cold cleaning machine any solvent with a vapor pressure of 1.0 millimeters of mercury (mm Hg) or greater, measured at 20 degrees Centigrade (68 degrees Fahrenheit containing volatile organic compounds.

5. Any person who sells or offers for sale any solvent containing volatile organic compounds for use in a cold cleaning machine shall provide to the purchaser the following written information:

a. The name and address of the solvent supplier.

b. The type of solvent including the product or vendor identification number.

c. The vapor pressure of the solvent measured in mm Hg at 20 degrees Centigrade (68 degrees Fahrenheit.

6. A person who operates a cold cleaning machine shall maintain for not less than two years and shall provide to the board, on request, the information specified in subdivision A 5 of this section. An invoice, bill of sale, certificate that corresponds to a number of sales, Material Safety Data Sheet (MSDS), or other appropriate documentation acceptable to the board may be used to comply with this section.

B. No owner or other person shall use or permit the use of a batch vapor cleaning machine that processes metal parts unless the machine complies with this article.

1. Batch vapor cleaning machines shall be equipped with:

a. Either a fully enclosed design or a working and downtime mode cover that completely covers the cleaning machine openings when in place, is free of cracks, holes and other defects, and can be readily opened or closed without disturbing the vapor zone. If the solvent cleaning machine opening is greater than 10 square feet, the cover shall be powered. If a lip exhaust is used, the closed cover shall be below the level of the lip exhaust.

b. Sides that result in a freeboard ratio greater than or equal to 0.75.

c. A safety switch (thermostat and condenser flow switch) that shuts off the sump heat if the coolant is not circulating.

d. A vapor up control switch that shuts off the spray pump if vapor is not present.

e. An automated parts handling system that moves the parts or parts baskets at a speed of 11 feet (3.4 meters) per minute or less when the parts are entering or exiting the vapor zone. If the parts basket or parts being cleaned occupy more than 50% of the solvent/air interface area, the speed of the parts basket or parts shall not exceed three feet per minute.

f. A device that shuts off the sump heat if the sump liquid solvent level drops to the sump heater coils.

g. A vapor level control device that shuts off the sump heat if the vapor level in the vapor cleaning machine rises above the height of the primary condenser.

h. Each vapor cleaning machine shall have a primary condenser.

i. Each vapor cleaning machine that uses a lip exhaust shall be designed and operated to route all collected solvent vapors through a properly operated and maintained carbon adsorber such that the concentration of organic solvent in the exhaust does not exceed 100 parts per million.

j. A permanent, conspicuous label summarizing the operating requirements found in subdivision B 4 of this section.

2. In addition to the requirements of subdivision B 1 of this section, the owner of a batch vapor cleaning machine with a solvent/air interface area of 13 square feet or less shall implement one of the following options:

a. A working mode cover, freeboard ratio of 1.0, and superheated vapor.

b. A freeboard refrigeration device operated to ensure that the chilled air blanket temperature is no greater than 30% of the solvent's boiling point and superheated vapor.

c. A working mode cover and a freeboard refrigeration device operated to ensure that the chilled air blanket temperature is no greater than 30% of the solvent's boiling point.

d. Reduced room draft, freeboard ratio of 1.0 and superheated vapor;

e. A freeboard refrigeration device operated to ensure that the chilled air blanket temperature is no greater than 30% of the solvent's boiling point and reduced room draft.

f. A freeboard refrigeration device operated to ensure that the chilled air blanket temperature is no greater than 30% of the solvent's boiling point and a freeboard ratio of 1.0.

g. A freeboard refrigeration device operated to ensure that the chilled air blanket temperature is no greater than 30% of the solvent's boiling point and dwell. Dwell shall be not less than 35% of the dwell time determined for the part or parts.

h. Reduced room draft, dwell and a freeboard ratio of 1.0.

i. A freeboard refrigeration device operated to ensure that the chilled air blanket temperature is no greater than 30% of the solvent's boiling point and a carbon adsorber that reduces solvent emissions in the exhaust to a level not to exceed 100 ppm at any time.

j. A freeboard ratio of 1.0, superheated vapor and a carbon adsorber that reduces solvent emissions in the exhaust to a level not to exceed 100 ppm at any time.

3. In addition to the requirements of subdivision B 1 of this section, the owner of a batch vapor cleaning machine with a solvent/air interface area of greater than 13 square feet shall use one of the following devices or strategies:

a. A freeboard refrigeration device operated to ensure that the chilled air blanket temperature is no greater than 30% of the solvent's boiling point, a freeboard ratio of 1.0 and superheated vapor.

b. Dwell, a freeboard refrigeration device operated to ensure that the chilled air blanket temperature is no greater than 30% of the solvent's boiling point, and reduced room draft. Dwell shall be not less than 35% of the dwell time determined for the part or parts.

c. A working mode cover and a freeboard refrigeration device operated to ensure that the chilled air blanket temperature is no greater than 30%6c; of the solvent's boiling point and superheated vapor.

d. Reduced room draft, freeboard ratio of 1.0 and superheated vapor.

e. A freeboard refrigeration device operated to ensure that the chilled air blanket temperature is no greater than 30% of the solvent's boiling point, reduced room draft and superheated vapor.

f. A freeboard refrigeration device operated to ensure that the chilled air blanket temperature is no greater than 30% of the solvent's boiling point, reduced room draft and a freeboard ratio of 1.0.

g. A freeboard refrigeration device operated to ensure that the chilled air blanket temperature is no greater than 30% of the solvent's boiling point, superheated vapor, and a carbon adsorber which reduces solvent emissions in the exhaust to a level not to exceed 100 ppm at any time.

4. Batch vapor cleaning machines shall be operated in accordance with the following procedures:

a. Waste solvent, still bottoms and sump bottoms shall be collected and stored in closed containers. The closed containers may contain a device that allows pressure relief, but does not allow liquid solvent to drain from the container.

b. Cleaned parts shall be drained at least 15 seconds or until dripping ceases, whichever is longer. Parts having cavities or blind holes shall be tipped or rotated while the part is draining. A superheated vapor system shall be an acceptable alternate technology.

c. Parts baskets or parts shall not be removed from the batch vapor cleaning machine until dripping has ceased.

d. Flushing or spraying of parts using a flexible hose or other flushing device shall be performed within the vapor zone of the batch vapor cleaning machine or within a section of the machine that is not exposed to the ambient air. The solvent spray shall be a solid fluid stream, not an atomized or shower spray.

e. When the cover is open, the batch vapor cleaning machine shall not be exposed to drafts greater than 40 meters per minute (132 feet per minute), as measured between 1 and 2 meters (3.3 and 6.6 feet) upwind and at the same elevation as the tank lip.

f. Sponges, fabric, wood, leather, paper products and other absorbent materials shall not be cleaned in the batch vapor cleaning machine.

g. Spills during solvent transfer and use of the batch vapor cleaning machine shall be cleaned up immediately or the machine shall be shut down. Wipe rags or other sorbent material shall be immediately stored in covered containers for disposal or recycling.

h. Work area fans shall be located and positioned so that they do not blow across the opening of the batch vapor cleaning machine.

i. During startup of the batch vapor cleaning machine, the primary condenser shall be turned on before the sump heater.

j. During shutdown of the batch vapor cleaning machine, the sump heater shall be turned off and the solvent vapor layer allowed to collapse before the primary condenser is turned off.

k. When solvent is added to or drained from the batch vapor cleaning machine, the solvent shall be transferred using threaded or other leakproof couplings and the end of the pipe in the solvent sump shall be located beneath the liquid solvent surface.

l. The working and downtime covers shall be closed at all times except during parts entry and exit from the machine, during maintenance of the machine when the solvent has been removed, and during addition of solvent to the machine.

m. If a lip exhaust is used on the open top vapor degreaser, the ventilation rate shall not exceed 20 m³/min/m² (65 ft³/min/ft²) of degreaser open area, unless a higher rate is necessary to meet OSHA requirements.

C. No owner or other person shall use or permit the use of an in-line vapor cleaning machine unless the machine complies with this article.

1. In-line vapor cleaning machines shall be equipped with:

a. Either a fully enclosed design or a working and downtime mode cover that completely covers the cleaning machine openings when in place, is free of cracks, holes and other defects, and can be readily opened or closed without disturbing the vapor zone.

b. A switch (thermostat and condenser flow switch) that shuts off the sump heat if the coolant is not circulating.

c. Sides that result in a freeboard ratio greater than or equal to 0.75.

d. A vapor up control switch.

e. An automated parts handling system that moves the parts or parts baskets at a speed of 11 feet (3.4 meters) per minute or less when the parts are entering or exiting the vapor zone. If the parts basket or parts being cleaned occupy more than 50% of the solvent/air interface area, the speed of the parts basket or parts shall not exceed three feet per minute.

f. A device that shuts off the sump heat if the sump liquid solvent level drops to the sump heater coils.

g. A vapor level control device that shuts off the sump heat if the vapor level in the vapor cleaning machine rises above the height of the primary condenser.

h. A permanent, conspicuous label summarizing these operating requirements.

i. A primary condenser.

j. Each machine that uses a lip exhaust shall be designed and operated to route all collected solvent vapors through a properly operated and maintained carbon adsorber such that the concentration of organic solvent in the exhaust does not exceed 100 parts per million.

2. In addition to the requirements of subdivision C 1 of this section, the owner of an in-line vapor cleaning machine shall use one of the following devices or strategies:

a. A freeboard ratio of 1.0 and superheated vapor.

b. A freeboard refrigeration device operated to ensure that the chilled air blanket temperature is no greater than 30% of the solvent's boiling point and a freeboard ratio of 1.0.

c. Dwell and a freeboard refrigeration device operated to ensure that the chilled air blanket temperature is no greater than 30% of the solvent's boiling point. Dwell shall be not less than 35% of the dwell time determined for the part or parts.

d. Dwell and a carbon adsorber that reduces solvent emissions in the exhaust to a level not to exceed 100 ppm at any time. Dwell shall be not less than 35% of the dwell time determined for the part or parts.

3. In-line vapor cleaning machines shall be operated in accordance with the following procedures:

a. Waste solvent, still bottoms, and sump bottoms shall be collected and stored in closed containers. The closed containers may contain a device that allows pressure relief, but does not allow liquid solvent to drain from the container.

b. Parts shall be oriented so that the solvent drains freely from the parts. Cleaned parts shall be drained at least 15 seconds or until dripping ceases, whichever is longer. Parts having cavities or blind holes shall be tipped or rotated while the part is draining.

c. Parts baskets or parts shall not be removed from the in-line vapor cleaning machine until dripping has ceased.

d. Flushing or spraying of parts using a flexible hose or other flushing device shall be performed within the vapor zone of the in-line vapor cleaning machine or within a section of the machine that is not exposed to the ambient air. The solvent spray shall be a solid fluid stream, not an atomized or shower spray.

e. Sponges, fabric, wood, leather, paper products and other absorbent materials shall not be cleaned in the in-line vapor cleaning machine.

f. Spills during solvent transfer and use of the in-line vapor cleaning machine shall be cleaned up immediately, and the wipe rags or other sorbent material shall be immediately stored in covered containers for disposal or recycling.

g. Workplace fans shall not be used near the degreaser opening, and ensure that exhaust ventilation shall not exceed 20 m³/min/m² of degreaser opening, unless a higher rate is necessary to meet OSHA requirements.

h. During startup of the in-line vapor cleaning machine the primary condenser shall be turned on before the sump heater.

i. During shutdown of the in-line vapor cleaning machine, the sump heater shall be turned off and the solvent vapor layer allowed to collapse before the primary condenser is turned off.

j. Spraying operations shall be done in the vapor zone or within a section of the machine that is not exposed to the ambient air.

k. When solvent is added to or drained from the in-line vapor cleaning machine, the solvent shall be transferred using threaded or other leakproof couplings and the end of the pipe in the solvent sump shall be located beneath the liquid solvent surface.

l. Openings shall be minimized during operation so that entrances and exits silhouette workloads with an average clearance between the parts and the edge of the degreaser opening of less than 10 cm (4 in) or less than 10% of the width of the opening.

D. No owner or other person shall use or permit the use of an airless cleaning machine or air-tight cleaning machine that processes metal parts unless the machine complies with this article.

1. The owner of each machine shall maintain a log of solvent additions and deletions for each machine including the weight of solvent contained in activated carbon or other sorbent material used to control emissions from the cleaning machine.

2. The owner of each machine shall demonstrate that the emissions from each machine, on a three-month rolling average, are equal to or less than the allowable limit determined by the use of Table 4-47A or the following equation if the volume of the cleaning machine exceeds 2.95 cubic meters:

EL = 330 (vol)^0.6

where:

EL = the three-month rolling average monthly emission limit (kilograms/month)

vol = the cleaning capacity of machine (cubic meters)

3. The owner of each machine shall operate the machine in conformance with the manufacturer's instructions and good air pollution control practices.

4. The owner of each machine equipped with a solvent adsorber shall measure and record the concentration of solvent in the exhaust of the carbon adsorber weekly with a colorimetric detector tube designed to measure a concentration of 100 ppm by volume of solvent to air at an accuracy of plus or minus 25 ppm by volume. This test shall be conducted while the solvent cleaning machine is in the working mode and is venting to the adsorber.

5. The owner of each machine equipped with a solvent adsorber shall maintain and operate the machine and adsorber system so that emissions from the adsorber exhaust do not exceed 100 ppm by volume measured while the solvent cleaning machine is in the working mode and is venting to the adsorber.

6. The machine shall be equipped with a permanent, conspicuous label summarizing the operating requirements in subdivision 7 of this subsection.

7. Airless cleaning machines and air-tight cleaning machines shall be operated in accordance with the following procedures:

a. Waste solvent, still bottoms, and sump bottoms shall be collected and stored in closed containers. The closed containers may contain a device that allows pressure relief, but does not allow liquid solvent to drain from the container.

b. Parts shall be oriented so that the solvent drains freely from the parts. Cleaned parts shall be drained at least 15 seconds or until dripping ceases, whichever is longer. Parts having cavities or blind holes shall be tipped or rotated while the part is draining.

c. Parts baskets or parts shall not be removed from the in-line vapor cleaning machine until dripping has ceased.

d. Sponges, fabric, wood, leather, paper products and other absorbent materials shall not be cleaned in the airless cleaning machines and air-tight cleaning machines.

e. Spills during solvent transfer and use of the airless cleaning machines and air-tight cleaning machines shall be cleaned up immediately, and the wipe rags or other sorbent material shall be immediately stored in covered containers for disposal or recycling.

f. Work area fans shall be located and positioned so that they do not blow across the airless cleaning machine and air-tight cleaning machine.

g. Spraying operations shall be done in the vapor zone or within a section of the machine that is not exposed to the ambient air.

h. When solvent is added to or drained from the airless cleaning machine and air-tight cleaning machine, the solvent shall be transferred using threaded or other leakproof couplings and the end of the pipe in the solvent sump shall be located beneath the liquid solvent surface.

E. As an alternative to complying with the provisions of subsections B through D of this section the owner of a solvent cleaning machine may demonstrate compliance with subdivision 1 or 2 of this subsection. The owner shall maintain records sufficient to demonstrate compliance. The records shall include, at a minimum, the quantity of solvent added to and removed from the solvent cleaning machine, the dates of the addition and removal and shall be maintained for not less than two years.

1. If the cleaning machine has a solvent/air interface, the owner shall:

a. Maintain a log of solvent additions and removals for each solvent cleaning machine.

b. Ensure that emissions from each solvent cleaning machine are equal to or less than the applicable emission limit presented in Table 4-47B.

2. If the cleaning machine is a batch vapor cleaning machine and does not have a solvent/air interface, the owner shall:

a. Maintain a log of solvent additions and deletions for each solvent cleaning machine.

b. Ensure that the emissions from each solvent cleaning machine are equal to or less than the appropriate limits as described in subdivisions 3 and 4 of this subsection. Each owner of a batch vapor or in-line cleaning machine complying with this section shall demonstrate compliance with the applicable three-month rolling average monthly emission limit on a monthly basis.

3. For cleaning machines with a cleaning capacity that is less than or equal to 2.95 cubic meters, the emission limit shall be determined using Table 4-47A or the equation in subdivision 4 of this subsection. If the table is used and the cleaning capacity of the cleaning machine falls between two cleaning capacity sizes, then the lower of the two emission limits applies.

4. For cleaning machines with a cleaning capacity that is greater than 2.95 cubic meters, the emission limit shall be determined using the following equation:

EL = 330 (vol)^0.6

where:

EL = the three-month rolling average monthly emission limit (kilograms/month)

vol = the cleaning capacity of machine (cubic meters)

5. Each owner of a batch vapor or in-line solvent cleaning machine complying with this subsection shall demonstrate compliance with the applicable three-month rolling average monthly emission limit on a monthly basis. If the applicable three-month rolling average emission limit is not met, an exceedance has occurred. All exceedances shall be reported to the board within 30 days of the determination of the exceedance.

F. The owner of a batch vapor or in-line solvent cleaning machine complying with subsection E shall maintain records and determine compliance with the applicable provisions in accordance with the following.

1. On the first operating day of every month ensure that the solvent cleaning machine system contains only clean liquid solvent. This includes, but is not limited to, fresh unused solvent, recycled solvent and used solvent that has been cleaned of soils. A fill line shall be indicated during the first month the measurements are made. The solvent level within the machine shall be returned to the same fill-line each month, immediately prior to calculating monthly emissions as specified in subdivision 2 of this subsection. The solvent cleaning machine does not have to be emptied and filled with fresh unused solvent prior to the calculations.

2. Using the records of all solvent additions and deletions for the previous monthly reporting period, determine solvent emissions (E) using one of the following equations:

For cleaning machines with a solvent/air interface:

where:

E = the total halogenated hazardous air pollutant (HAP) solvent emissions from the solvent cleaning machine during the most recent monthly reporting period (kilograms of solvent per square meter of solvent/air interface area per month)

SA = the total amount of halogenated HAP liquid solvent added to the solvent cleaning machine during the most recent monthly reporting period (kilograms of solvent per month)

LSR = the total amount of halogenated HAP liquid solvent removed from the solvent cleaning machine during the most recent monthly reporting period (kilograms of solvent per month)

SSR = the total amount of halogenated HAP solvent removed from the solvent cleaning machine in solid waste during the most recent monthly reporting period (kilograms of solvent per month) determined from tests conducted using EPA Reference Method 25d or by engineering calculations included in the compliance report

Area = the solvent/air interface area of the solvent cleaning machine (square meters)

For cleaning machines without a solvent/air interface:

E = SA - LSR - SSR

where:

E = the total halogenated HAP solvent emissions from the solvent cleaning machine during the most recent monthly reporting period i, (kilograms of solvent per month)

SA = the total amount of halogenated HAP liquid solvent added to the solvent cleaning machine during the most recent monthly reporting period (kilograms of solvent per month)

LSR = the total amount of halogenated HAP liquid solvent removed from the solvent cleaning machine during the most recent monthly reporting period (kilograms of solvent per month)

SSR = the total amount of halogenated HAP solvent removed from the solvent cleaning machine in solid waste during the most recent monthly reporting period (kilograms of solvent per month) determined from tests conducted using EPA reference method 25d or by engineering calculations included in the compliance report

3. Determine the monthly rolling average, EA, for the three-month period ending with the most recent reporting period using one of the following equations:

For cleaning machines with a solvent/air interface:

where:

EA = the average halogenated HAP solvent emissions over the preceding three-monthly reporting periods (kilograms of solvent per square meter of solvent/air interface area per month)

E = halogenated HAP solvent emissions for each month (j) for the most recent three-monthly reporting periods (kilograms of solvent per square meter of solvent/air interface area)

j=1 = the most recent monthly reporting period

j=2 = the monthly reporting period immediately prior to j=1

j=3 = the monthly reporting period immediately prior to j=2

For cleaning machines without a solvent/air interface:

where:

EA = the average halogenated HAP solvent emissions over the preceding three monthly reporting periods (kilograms of solvent per month)

E = halogenated HAP solvent emissions for each month (j) for the most recent three monthly reporting periods (kilograms of solvent per month)

j=1 = the most recent monthly reporting period

j=2 = the monthly reporting period immediately prior to j=1

j=3 = the monthly reporting period immediately prior to j=2

G. The owner of a solvent cleaning machine subject to the provisions of subsections B through D of this section shall conduct monitoring and recordkeeping as follows.

1. If a freeboard refrigeration device is used to comply with these standards, the owner shall use a thermometer or thermocouple to measure the temperature at the center of the air blanket during the idling mode. Measurements and recordings shall be made weekly.

2. If a superheated vapor system is used to comply with these standards, the owner shall use a thermometer or thermocouple to measure the temperature at the center of the superheated solvent vapor zone while the solvent cleaning machine is in the idling mode. Measurements and recordings shall be made weekly.

3. If a cover (working-mode, downtime-mode, or idling-mode cover) is used to comply with these standards, the owner shall conduct a visual inspection to determine if the cover is opening and closing properly, completely covers the cleaning machine openings when closed, and is free of cracks, holes, and other defects. Observations and recordings shall be made weekly.

4. If dwell is used, the owner shall determine the actual dwell time by measuring the period of time that parts are held within the freeboard area of the solvent cleaning machine after cleaning. Observations and recordings shall be made monthly.

5. The owner shall determine the hoist speed by measuring the time it takes for the hoist to travel a measured distance. The speed is equal to the distance in meters divided by the time in minutes (meters per minute). Measurements and recordings shall be made monthly.

6. The owner of a batch vapor or in-line solvent cleaning machine complying using reduced room draft, maintained by controlling room parameters (i.e., redirecting fans, closing doors and windows, etc.), shall conduct monitoring and record the results as follows.

a. Initially measure the windspeed within six inches above the top of the freeboard area of the solvent cleaning machine in accordance with the following:

(1) Determine the direction of the wind current by slowly rotating a velometer or similar device until the maximum speed is located.

(2) Orient a velometer in the direction of the wind current at each of the four corners of the machine.

(3) Record the reading for each corner.

(4) Average the values obtained at each corner and record the average wind speed.

b. Record the room parameters established during the initial compliance test to achieve the reduced room draft.

c. Quarterly monitoring of the windspeed in accordance with subdivision 6 a of this subsection.

d. Weekly monitoring of the room parameters as specified in subdivision 6 b of this subsection.

7. If an enclosure (full or partial) is used to achieve reduced room draft, the owner shall conduct an initial monitoring test and, thereafter, monthly monitoring tests of the windspeed within the enclosure by slowly rotating a velometer inside the entrance to the enclosure until the maximum speed is located and record the maximum wind speed. The owner shall also conduct a monthly visual inspection of the enclosure to determine if it is free of cracks, holes and other defects.

8. The owner of a machine using a carbon adsorber to comply with this section shall measure and record the concentration of halogenated HAP solvent in the exhaust of the carbon adsorber weekly with a colorimetric detector tube. This test shall be conducted while the solvent cleaning machine is in the working mode and is venting to the carbon adsorber. The exhaust concentration shall be determined using a colorimetric detector tube designed to measure a concentration of 100 parts per million by volume of solvent in air to an accuracy of plus or minus 25 parts per million by volume. The concentration shall be determined through a sampling port for monitoring within the exhaust outlet that is easily accessible and located at least eight stack or duct diameters downstream and two stack or duct diameters upstream from any flow disturbance such as a bend, expansion, contraction, or outlet, and downstream from no other inlet.