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Solvent Degreasers 
March 1995

TNRCC Regulation VI requires that Best Available Control
Technology (BACT) be applied to all facilities that must
obtain a permit from the TNRCC.  The BACT determination is
made on a case-by-case basis.  You are encouraged to talk with
us to determine the BACT for your facility.  Current BACT
depends on the type of solvent degreaser.  General guidelines
for BACT are the requirements listed in TNRCC Subchapter E of
30 Texas Administrative Code (TAC) Chapter 115, otherwise
known as Regulation V Subchapter E.  These requirements are
included in Section II of this document.  Part D, Section VI,
Form PI-1 requires the applicant to submit a BACT analysis. 
Any BACT proposal that does not include the requirements in
Regulation V Subchapter E needs to be explained in detail.  If
you need assistance for the halogenated solvent degreasing
industry or any other regulations, please contact the TNRCC,
Office of Air Quality, New Source Review, Coatings Section at
(512) 239-1240.

Extract from Regulation V - Solvent Degreaser Requirements

              SUBCHAPTER E : SOLVENT-USING PROCESSES

                DEGREASING AND CLEAN-UP PROCESSES

The requirements listed below are for solvent degreasing
facilities in the specified counties.  The requirements may
also be considered Best Available Control Technology (BACT)
for many facilities regardless of location.  These requiements
are divided into area designations and are listed by type of
unit.

115.412.  Control Requirements.

     (a)  For the Beaumont/Port Arthur, Dallas/Fort Worth, El
Paso, and Houston/Galveston areas as defined in 115.10 of
this title (relating to Definitions), the following control
requirements shall apply.

          (1)  No person shall own or operate a system
utilizing a volatile organic compound (VOC) for the cold
cleaning of objects without the following controls:

               (A)  A cover shall be provided for each cleaner
which shall be kept closed whenever parts are not being
handled in the cleaner.  The cover shall be designed for easy
one-handed operation if any of the following exists:

                      (i)  the true vapor pressure of the
solvent is greater than 0.3 pounds per square inch absolute (2
kPa) as measured at 100F (38C);

                     (ii)  the solvent is agitated; or

                    (iii)  the solvent is heated.

               (B)  An internal cleaned-parts drainage
facility, for enclosed draining under a cover, shall be
provided for all cold cleaners.

               (C)  A permanent label summarizing the
operating requirements in paragraph (1)(F) of this subsection
shall be attached to the cleaner in a conspicuous location
near the operator.

               (D)  If a solvent spray is used, it must be a
solid fluid stream (not a fine, atomized, or shower-type
spray) and at an operating pressure of 10 pounds per square
inch gauge or less as necessary to prevent splashing above the
acceptable freeboard.

               (E)  The system shall be equipped with a
freeboard that provides a ratio (the freeboard height divided
by the degreaser width) equal to or greater than 0.7, or a
water cover (solvent must be insoluble in and heavier than
water).

               (F)  The operating procedures shall be as
follows:

                      (i)  Waste solvent shall not be disposed
of or transferred to another party such that the waste solvent
can evaporate into the atmosphere.  Waste solvents shall be
stored only in covered containers.

                     (ii)  The degreaser cover shall be kept
closed whenever parts are not being handled in the cleaner.

                    (iii)  Parts shall be drained for at least
15 seconds or until dripping ceases.

                    (iv)  Porous or absorbent materials, such
as cloth, leather, wood, or rope, shall not be degreased.

          (2)  No person shall own or operate a system
utilizing a VOC for the open-top vapor cleaning of objects
without the following controls.

               (A)  A cover that can be opened and closed
easily without disturbing the vapor zone.

               (B)  The following devices which will
automatically shut off the sump heat:

                      (i)  a condenser coolant flow sensor and
thermostat which will detect if the condenser coolant is not
circulating or if the condenser coolant temperature exceeds
the solvent manufacturer's recommendations;

                     (ii)  a solvent level sensor which will
detect if the solvent level drops below acceptable design
limits; and

                    (iii)  a vapor level sensor which will
detect if the vapor level rises above acceptable design
limits.

               (C)  A spray safety switch which will shut off
the spray pump to prevent spraying above the vapor level.

               (D)  One of the following controls:

                      (i)  a freeboard that provides a ratio
(the distance from the top of the vapor level to the top edge
of the degreasing tank divided by the degreaser width) equal
to or greater than 0.75 and, if the degreaser opening is
greater than 10 ft2 (1 m2), a powered cover;

                     (ii)  a properly sized refrigerated
chiller capable of achieving 85% or greater control of VOC
emissions;

                    (iii)  an enclosed design where the cover
or door opens only when the dry part is actually entering or
exiting the degreaser; or

                     (iv)  a carbon adsorption system with
ventilation equal to or greater than 50 cfm/ft2 (15 m3/min per
m2) of air/vapor area (with the cover open) and exhausting
less than 25 parts per million of solvent by volume averaged
over one complete adsorption cycle.

               (E)  A permanent, conspicuous, label
summarizing the operating procedures listed in paragraph
(2)(F) of this subsection.

               (F)  The following operating procedures.

                       (i)  The cover shall be closed at all
times except when processing work loads through the degreaser.

                      (ii)  Parts shall be positioned so that
complete drainage is obtained.

                     (iii)  Parts shall be moved in and out of
the degreaser at less than 11 ft/min (3.3 m/min).

                      (iv)  The work load shall be retained in
the vapor zone at least 30 seconds or until condensation
ceases.

                       (v)  Any pools of solvent on the
cleaned parts shall be removed by tipping the part before
withdrawing it from the vapor zone.

                      (vi)  Parts shall be allowed to dry
within the degreaser freeboard area for at least 15 seconds or
until visually dry.

                     (vii)  Porous or absorbent materials,
such as cloth, leather, wood, or rope, shall not be degreased.

                    (viii)  Work loads shall not occupy more
than half of the degreaser open top surface area.

                      (ix)  Solvent shall not be sprayed above
the vapor level.

                       (x)  Solvent leaks shall be repaired
immediately, or the degreaser shall be shut down until repairs
are made.

                      (xi)  Waste solvent shall not be
disposed of or transferred to another party such that the
waste solvent will evaporate into the atmosphere.  Waste
solvent shall be stored only in covered containers.

                     (xii)  Exhaust ventilation for systems
other than those which vent to a major control device shall
not exceed 65 cubic feet per minute per ft2 (20 m3/min per m2)
of degreaser open area, unless necessary to meet Occupational
Safety and Health Administration (OSHA) requirements or unless
a carbon adsorption system is installed as a major control
device.  Ventilation fans or other sources of air agitation
shall not be used near the degreaser opening.

                    (xiii)  Water shall not be visibly
detectable in the solvent exiting the water separator.

          (3)  No person shall own or operate a system
utilizing a VOC for the conveyorized cleaning of objects
without the following controls:

               (A)  One of the following major control
devices:

                       (i)  a properly sized refrigerated
chiller capable of achieving 85% or greater control of VOC
emissions; or

                      (ii)  a carbon adsorption system with
ventilation equal to or greater than 50 cfm/ft2 (15 m3/min/m2)
of air/vapor area (when downtime covers are open) and
exhausting less than 25 ppm of solvent by volume averaged over
one complete adsorption cycle.

               (B)  A drying tunnel or other means, such as
rotating (tumbling) basket if space is available, to prevent
solvent liquid or vapor carry-out.

               (C)  A condenser flow switch and thermostat
which will shut off sump heat if the condenser coolant is not
circulating or if the condenser coolant discharge temperature
exceeds the solvent manufacturer's recommendation.

               (D)  A spray safety switch which will shut off
the spray pump if the vapor level drops more than 4 inches (10
cm).

               (E)  A vapor level control thermostat which
will shut off the sump heat when the vapor level rises above
the designed operating level.

               (F)  Entrances and exits which silhouette work
loads so that the average clearance (between parts and edge of
the degreaser opening) is either less than 4 inches (10 cm) or
less than 10% of the width of the opening.

               (G)  Downtime covers which close off the
entrance and exit during nonoperating hours.

               (H)  A permanent, conspicuous label near the
operator summarizing the operating requirements in
subparagraph (I) of this paragraph.

               (I)  The following operating procedures.

                      (i)  Exhaust ventilation for systems
other than those which vent to a major control device shall
not exceed 65 cfm/ft2 (20 m3/min/m2) of degreaser opening,
unless necessary to meet OSHA requirements or unless a carbon
adsorption system is installed as a major control device. 
Ventilation fans shall not be used near the degreaser opening.

                     (ii)  Parts shall be positioned so that
complete drainage is obtained.

                    (iii)  Vertical conveyor speed shall be
maintained at less than 11 ft/min (3.3 m/min).

                     (iv)  Waste solvent shall not be disposed
of, or transferred to another party, such that the waste
solvent can evaporate into the atmosphere.  Waste solvent
shall be stored only in covered containers.

                      (v)  Leaks shall be repaired immediately
or the degreaser shall be shut down until repairs are made. 

                     (vi)  Water shall not be visibly
detectable in the solvent exiting the water separator.

                    (vii)  Downtime covers shall be placed
over entrances and exits of conveyorized degreasers
immediately after the conveyor and exhaust are shut down and
removed just before they are started up.

                    (viii)  Porous or absorbent materials,
such as cloth, leather, wood, or rope, shall not be degreased.

     (b)  For Gregg, Nueces, and Victoria Counties, the
following control requirements shall apply.

          (1)  No person shall own or operate a system
utilizing a VOC for the cold cleaning of objects without the
following controls:

               (A)  A cover shall be provided for each cleaner
which shall be kept closed whenever parts are not being
handled in the cleaner.  The cover shall be designed for easy
one-handed operation if any of the following exists:

                      (i)  the true vapor pressure of the
solvent is greater than 0.3 psia (2 kPa) as measured at 100F
(38C);

                     (ii)  the solvent is agitated; or

                    (iii)  the solvent is heated.

               (B)  An internal cleaned-parts drainage
facility, for enclosed draining under a cover, shall be
provided for all cold cleaners.

               (C)  A permanent label summarizing the
operating requirements in paragraph (1)(F) of this subsection
shall be attached to the cleaner in a conspicuous location
near the operator.

               (D)  If a solvent spray is used, it must be a
solid fluid stream (not a fine, atomized, or shower-type
spray) and at an operating pressure of 10 psig or less as
necessary to prevent splashing above the acceptable freeboard.

               (E)  The system shall be equipped with a
freeboard that provides a ratio (the freeboard height divided
by the degreaser width) equal to or greater than 0.7, or a
water cover (solvent must be insoluble in and heavier than
water).

               (F)  The operating procedures shall be as
follows.

                      (i)  Waste solvent shall not be disposed
of or transferred to another party such that the waste solvent
can evaporate into the atmosphere.  Waste solvents shall be
stored only in covered containers.

                     (ii)  The degreaser cover shall be kept
closed whenever parts are not being handled in the cleaner.

                    (iii)  Parts shall be drained for at least
15 seconds or until dripping ceases.

                     (iv)  Porous or absorbent materials, such
as cloth, leather, wood, or rope, shall not be degreased.

          (2)  No person shall own or operate a system
utilizing a VOC for the open-top vapor cleaning of objects
without the following controls:

               (A)  A cover that can be opened and closed
easily without disturbing the vapor zone.

               (B)  The following devices which will
automatically shut off the sump heat:

                      (i)  a condenser coolant flow sensor and
thermostat which will detect if the condenser coolant is not
circulating or if the condenser coolant temperature exceeds
the solvent manufacturer's recommendations;

                     (ii)  a solvent level sensor which will
detect if the solvent level drops below acceptable design
limits; and

                    (iii)  a vapor level sensor which will
detect if the vapor level rises above acceptable design
limits.

               (C)  A spray safety switch which will shut off
the spray pump to prevent spraying above the vapor level.

               (D)  One of the following controls:

                      (i)  a freeboard that provides a ratio
(the distance from the top of the vapor level to the top edge
of the degreasing tank divided by the degreaser width) equal
to or greater than 0.75 and, if the degreaser opening is
greater than 10 ft2 (1m2), a powered cover;

                     (ii)  a properly-sized, refrigerated
chiller capable of achieving 85% or greater control of VOC
emissions;

                    (iii)  an enclosed design where the cover
or door opens only when the dry part is actually entering or
exiting the degreaser; or

                     (iv)  a carbon adsorption system with
ventilation equal to or greater than 50 cfm/ft2 (15 m3/min per
m2) of air/vapor area (with the cover open) and exhausting
less than 25 ppm of solvent by volume averaged over one
complete adsorption cycle.

               (E)  A permanent, conspicuous label summarizing
the operating procedures listed in paragraph (2)(F) of this
subsection.

               (F)  The following operating procedures.

                      (i)  The cover shall be closed at all
times, except when processing work loads through the
degreaser.

                     (ii)  Parts shall be positioned so that
complete drainage is obtained.

                    (iii)  Parts shall be moved in and out of
the degreaser at less than 11 ft/min (3.3 m/min).

                     (iv)  The work load shall be retained in
the vapor zone at least 30 seconds or until condensation
ceases.

                      (v)  Any pools of solvent on the cleaned
parts shall be removed by tipping the part before withdrawing
it from the vapor zone.

                     (vi)  Parts shall be allowed to dry
within the degreaser freeboard area for at least 15 seconds or
until visually dry.

                    (vii)  Porous or absorbent materials, such
as cloth, leather, wood, or rope, shall not be degreased.

                   (viii)  Work loads shall not occupy more
than half of the degreaser open top surface area.

                     (ix)  Solvent shall not be sprayed above
the vapor level.

                      (x)  Solvent leaks shall be repaired
immediately, or the degreaser shall be shut down until repairs
are made.

                     (xi)  Waste solvent shall not be disposed
of or transferred to another party such that the waste solvent
will evaporate into the atmosphere.  Waste solvent shall be
stored only in covered containers.

                    (xii)  Exhaust ventilation for systems
other than those which vent to a major control device shall
not exceed 65 cfm per ft2 (20 m3/min per m2) of degreaser open
area, unless necessary to meet OSHA requirements or unless a
carbon adsorption system is installed as a major control
device.  Ventilation fans or other sources of air agitation
shall not be used near the degreaser opening.

                   (xiii)  Water shall not be visibly
detectable in the solvent exiting the water separator.

          (3)  No person shall own or operate a system
utilizing a VOC for the conveyorized cleaning of objects
without the following controls:

               (A)  One of the following major control
devices:

                      (i)  a properly-sized, refrigerated
chiller capable of achieving 85% or greater control of VOC
emissions; or

                     (ii)  a carbon adsorption system with
ventilation equal to or greater than 50 cfm/ft2 (15 m3/min/m2)
of air/vapor area (when downtime covers are open) and
exhausting less than 25 ppm of solvent by volume averaged over
one complete adsorption cycle.

               (B)  A drying tunnel or other means, such as
rotating (tumbling) basket if space is available, to prevent
solvent liquid or vapor carry-out.

               (C)  A condenser flow-switch and thermostat
which will shut off sump heat if the condenser coolant is not
circulating or if the condenser coolant discharge temperature
exceeds the solvent manufacturer's recommendation.

               (D)  A spray safety switch which will shut off
the spray pump if the vapor level drops more than four inches
(10 cm).

               (E)  A vapor level control thermostat which
will shut off the sump heat when the vapor level rises above
the designed operating level.

               (F)  Entrances and exits which silhouette work
loads so that the average clearance (between parts and edge of
the degreaser opening) is either less than four inches (10 cm)
or less than 10% of the width of the opening.

               (G)  Downtime covers which close off the
entrance and exit during nonoperating hours.

               (H)  A permanent, conspicuous label near the
operator summarizing the operating requirements in
subparagraph (I) of this paragraph.

               (I)  The following operating procedures:

                      (i)  Exhaust ventilation for systems
other than those which vent to a major control device shall
not exceed 65 cfm/ft2 (20 m3/min/m2) of degreaser opening,
unless necessary to meet OSHA requirements or unless a carbon
adsorption system is installed as a major control device. 
Ventilation fans shall not be used near the degreaser opening.

                     (ii)  Parts shall be positioned so that
complete drainage is obtained.

                    (iii)  Vertical conveyor speed shall be
maintained at less than 11 ft/min (3.3 m/min).

                     (iv)  Waste solvent shall not be disposed
of or transferred to another party such that the waste solvent
can evaporate into the atmosphere.  Waste solvent shall be
stored only in covered containers.

                      (v)  Leaks shall be repaired immediately
or the degreaser shall be shut down until repairs are made.

                     (vi)  Water shall not be visibly
detectable in the solvent exiting the water separator.

                    (vii)  Downtime covers shall be placed
over entrances and exits of conveyorized degreasers
immediately after the conveyor and exhaust are shut down and
removed just before they are started up.

                   (viii)  Porous or absorbent materials, such
as cloth, leather, wood, or rope, shall not be degreased.

115.413.  Alternate Control Requirements.

     (a)  For all affected persons in the Beaumont/Port
Arthur, Dallas/Fort Worth, El Paso, and Houston/Galveston
areas, alternate methods of demonstrating and documenting
continuous compliance with the applicable control requirements
or exemption criteria in this section may be approved by the
Executive Director in accordance with 115.910 of this title
(relating to Alternate Means of Control) if emission
reductions are demonstrated to be substantially equivalent.

          (1)  An alternative capture and control system for
cold solvent cleaners with a demonstrated overall volatile
organic compound (VOC) emission reduction efficiency of 65% or
greater may be used in lieu of the requirements of
115.412(a)(1) of this title (relating to Control
Requirements), if approved by the Executive Director.

          (2)  An alternate capture and control system for
open-top vapor or conveyorized degreasers with a demonstrated
overall VOC emission reduction efficiency of 85% or greater
may be used in lieu of the requirements of 115.412(a)(2)(D) or
(a)(3)(A) of this title, if approved by the Executive
Director.

     (b)  For all affected persons in Gregg, Nueces, and
Victoria Counties, alternate methods of demonstrating and
documenting continuous compliance with the applicable control
requirements or exemption criteria in this section may be
approved by the Executive Director in accordance with 115.910
of this title (relating to Alternate Means of Control) if
emission reductions are demonstrated to be substantially
equivalent.

          (1)  An alternative capture and control system for
cold solvent cleaners with a demonstrated overall VOC emission
reduction efficiency of 65% or greater may be used in lieu of
the requirements of 115.412(b)(1) of this title, if approved
by the Executive Director.

          (2)  An alternate capture and control system for
open-top vapor or conveyorized degreasers with a demonstrated
overall VOC emission reduction efficiency of 85% or greater
may be used in lieu of the requirements of 115.412(b)(2)(D) or
(b)(3)(A) of this title, if approved by the Executive
Director.

115.415.  Testing Requirements.

     (a)  For the Beaumont/Port Arthur, Dallas/Fort Worth, El
Paso, and Houston/Galveston areas, the following testing
requirements shall apply.

          (1)  Compliance with 115.412(a)(1) of this title
(relating to Control Requirements) shall be determined by
applying the following test methods, as applicable:

               (A)  determination of true vapor pressure using
American Society for Testing Materials (ASTM) Test Method
D323-89, ASTM Test Method D2879, ASTM Test Method D4953, ASTM
Test Method D5190, or ASTM Test Method D5191 for the
measurement of Reid vapor pressure (RVP), adjusted for actual
storage temperature in accordance with American Petroleum
Institute (API) Publication 2517, Third Edition, 1989; or

               (B)  minor modifications to these test methods
and procedures approved by the Executive Director.

          (2)  Compliance with 115.412(a)(2)(D)(iv) and
(a)(3)(A)(ii) of this title and 115.413(a)(2) of this title
(relating to Alternate Control Requirements) shall be
determined by applying the following test methods, as
appropriate:

               (A)  Test Methods 1-4 (40 Code of Federal
Regulations (CFR) 60, Appendix A) for determining flow rates,
as necessary;

               (B)  Test Method 18 (40 CFR 60, Appendix A) for
determining gaseous organic compound emissions by gas
chromatography;

               (C)  Test Method 25 (40 CFR 60, Appendix A) for
determining total gaseous nonmethane organic emissions as
carbon;

               (D)  Test Methods 25A or 25B (40 CFR 60,
Appendix A) for determining total gaseous organic
concentrations using flame ionization or nondispersive
infrared analysis; or

               (E)  minor modifications to these test methods
and procedures approved by the Executive Director.

     (b)  For Gregg, Nueces, and Victoria Counties, the
following testing requirements shall apply.

          (1)  Compliance with 115.412(b)(1) of this title
shall be determined by applying the following test methods, as
applicable:

               (A)  determination of true vapor pressure using
ASTM Test Method D323-89, ASTM Test Method D2879, ASTM Test
Method D4953, ASTM Test Method D5190, or ASTM Test Method
D5191 for the measurement of RVP, adjusted for actual storage
temperature in accordance with API Publication 2517, Third
Edition, 1989; or

               (B)  minor modifications to these test methods
and procedures approved by the Executive Director.

          (2)  Compliance with 115.412(b)(2)(D)(iv) and
(b)(3)(A)(ii) of this title and 115.413(b)(2) of this title
shall be determined by applying the following test methods, as
appropriate:

               (A)  Test Methods 1-4 (40 CFR 60, Appendix A)
for determining flow rates, as necessary;

               (B)  Test Method 18 (40 CFR 60, Appendix A) for
determining gaseous organic compound emissions by gas
chromatography;

               (C)  Test Method 25 (40 CFR 60, Appendix A) for
determining total gaseous nonmethane organic emissions as
carbon;

               (D)  Test Methods 25A or 25B (40 CFR 60,
Appendix A) for determining total gaseous organic
concentrations using flame ionization or nondispersive
infrared analysis; or

               (E)  minor modifications to these test methods
and procedures approved by the Executive Director.

115.416.  Recordkeeping Requirements.

     (a)  For the Beaumont/Port Arthur, Dallas/Fort Worth, El
Paso, and Houston/Galveston areas, the owner or operator of
any polyester resin operation, or open-top vapor or
conveyorized degreasing operation shall maintain the following
records at the facility for at least two years and shall make
such records available upon request to representatives of the
Texas Natural Resource Conservation Commission (TNRCC), U.S.
Environmental Protection Agency (EPA), or the local air
pollution control agency having jurisdiction in the area.

          (1)  A record of control equipment maintenance, such
as replacement of the carbon in a carbon adsorption unit.

          (2)  The results of all tests conducted at the
facility in accordance with the requirements described in
115.415(a)(2) of this title (relating to Testing
Requirements).

          (3)  A record of monthly resin and acetone usage
sufficient to document compliance with the requirements
described in 115.412(a)(4) of this title (relating to Control
Requirements).

          (4)  A record of monthly resin and acetone usage
sufficient to document the applicability of the conditions for
exemption referenced in 115.417(a)(3) of this title (relating
to Exemptions).

     (b)  For Gregg, Nueces, and Victoria Counties, the owner
or operator of any open-top vapor or conveyorized degreasing
operation shall maintain the following records at the facility
for at least two years and shall make such records available
upon request to representatives of the TNRCC, EPA, or the
local air pollution control agency having jurisdiction in the
area.

          (1)  A record of control equipment maintenance, such
as replacement of the carbon in a carbon adsorption unit.

          (2)  The results of all tests conducted at the
facility in accordance with the requirements described in
115.415(b)(2) of this title.

115.417.  Exemptions
     
     (a)  For the Beaumont/Port Arthur, Dallas/Fort Worth, El
Paso, and Houston/Galveston areas, the following exemptions
shall apply.

          (1)  Any cold solvent cleaning system is exempt from
the provisions of 115.412(a)(1)(B) of this title (relating to
Control Requirements) and may use an external drainage
facility in place of an internal type drainage system, if the
true vapor pressure of the solvent is less than or equal to
0.6 pounds per square inch absolute (psia) (4.1 kPa) as
measured at 100F (38C) or if a cleaned part can not fit into
an internal drainage facility.

          (2)  Any cold solvent cleaning system is exempt from
the requirements of 115.412(a)(1)(E) of this title, if the
true vapor pressure of the solvent is less than or equal to
0.6 psia (4.1 kPa) as measured at 100F (38C), or if the
solvent is not heated above 120F (49C). 

          (3)  A polyester resin operation with a monthly
resin usage, including gelcoat, of less than one ton is exempt
from 115.412(a)(4) of this title (relating to Control
Requirements). For the purposes of this paragraph, usage is
defined as gross usage minus waste disposal.

          (4)  Any conveyorized degreaser with less than 20
ft2 (2 m2) of air/vapor interface is exempt from the
requirement of 115.412(a)(3)(A) of this title. 

          (5)  Any open-top vapor degreaser with an open area
less than 10 ft2 (1 m2) is exempt from the refrigerated
chiller or the carbon adsorber requirements in
115.412(a)(2)(D)(ii) and (iv) of this title.

          (6)  An owner or operator who operates a remote
reservoir cold solvent cleaner which uses solvent with a true
vapor pressure equal to or less than 0.6 psia (4.1 kPa)
measured at 100F (38C) and which has a drain area less than
16 in2 (100 cm2) and who properly disposes of waste solvent in
enclosed containers is exempt from 115.412(a)(1) of this
title.

     (b)  For Gregg, Nueces, and Victoria Counties, the
following exemptions shall apply.

          (1)  Any cold solvent cleaning system is exempt from
the provisions of 115.412(b)(1)(B) of this title and may use
an external drainage facility in place of an internal type
drainage system, if the true vapor pressure of the solvent is
less than or equal to 0.6 psia (4.1 kPa) as measured at 100F
(38C) or if a cleaned part can not fit into an internal
drainage facility.

          (2)  Any cold solvent cleaning system is exempt from
the requirements of 115.412(b)(1)(E) of this title, if the
true vapor pressure of the solvent is less than or equal to
0.6 psia (4.1 kPa) as measured at 100F (38C), or if the
solvent is not heated above 120F (49C).

          (3)  Degreasing operations located on any property
which can emit, when uncontrolled, a combined weight of VOC
less than 550 pounds (249.5 kg) in any consecutive 24-hour
period are exempt from the provisions of 115.412(b) of this
title.

          (4)  Any conveyorized degreaser with less than 20
ft2 (2 m2) of air/vapor interface is exempt from the
requirements of 115.412(b)(3)(A) of this title. 

          (5)  Any open-top vapor degreaser with an open area
less than 10 ft2 (1 m2) is exempt from the refrigerated
chiller or the carbon adsorber requirements in
115.412(b)(2)(D)(ii) and (iv) of this title.

          (6)  An owner or operator who operates a remote
reservoir cold solvent cleaner which uses solvent with a true
vapor pressure equal to or less than 0.6 psia (4.1 kPa)
measured at 100F (38C) and which has a drain area less than
16 in2 (100 cm2) and who properly disposes of waste solvent in
enclosed containers is exempt from 115.412(b)(1) of this
title.

Adopted 05/04/94                    Effective 05/27/94