the HAP listed in table 1 to this appendix as specified in table 2A
to this appendix. For each process unit type, table 2A to this
appendix specifies whether emissions testing is required or if
emissions estimation is allowed as an alternative to emissions
testing. If emissions estimation is allowed according to table 2A,
you must develop your emission estimates according to the
requirements in paragraph (k) of this section. You may choose to
perform emissions testing instead of emissions estimation. You must
conduct HAP emissions tests according to the requirements in
paragraphs (b) through (j) of this section and the methods specified
in table 2B to this appendix. If you conduct fuel analyses, you must
follow the requirements of paragraph (m) of this section. For each
of the emission points at your affected source, you must obtain the
emission rates in pounds per hour (lb/hr) for each of the pollutants
listed in table 1 to this appendix.
    (b) Periods when emissions tests must be conducted.
    (1) You must not conduct emissions tests during periods of
startup, shutdown, or malfunction, as specified in 40 CFR
63.7(e)(1).
    (2) You must test under worst-case operating conditions as
defined in this appendix. You must describe your worst-case
operating conditions in your performance test report for the process
and control systems (if applicable) and explain why the conditions
are worst-case.
    (c) Number of test runs. You must conduct three separate test
runs for each test required in this section, as specified in 40 CFR
63.7(e)(3). Each test run must last at least 1 hour except for:
testing of a temporary total enclosure (TTE) conducted using Methods
204A through 204F in 40 CFR part 51, appendix M, which require three
separate test runs of at least 3 hours each; and testing of an
enclosure conducted using the alternative tracer gas method in
appendix A to 40 CFR part 63, subpart DDDD, which requires a minimum
of three separate runs of at least 20 minutes each.
    (d) Sampling locations. Sampling sites must be located at the
emission point and prior to any releases to the atmosphere. For
example, at the outlet of the control device, including wet control
devices, and prior to any releases to the atmosphere.
    (e) Collection of monitoring data for HAP control devices.
During the emissions test, you must collect operating parameter
monitoring system or continuous emissions monitoring system (CEMS)
data at least every 15 minutes during the entire emissions test and
establish the site-specific operating requirements (including the
parameter limits or total hydrocarbon (THC) concentration limit) in
table 2 to 40 CFR part 63, subpart DDDD, using data from the
monitoring system and the procedures specified in paragraphs (k)
through (o) of Sec.  63.2262 of subpart DDDD of 40 CFR part 63.
    (f) Nondetect data. You may treat emissions of an individual HAP
as zero if all of the test runs result in a nondetect measurement
and the conditions in paragraphs (1) and (2) of this section are met
for the relevant test method. Otherwise, nondetect data (as defined
in Sec.  63.2292 of 40 CFR part 63, subpart DDDD) for individual HAP
must be treated as one-half of the method detection limit.
    (1) The method detection limit is less than or equal to 1 part
per million by volume, dry (ppmvd) for pollutant emissions measured
using Method 320 in appendix A to 40 CFR part 63; or Method 18 in
appendix A to 40 CFR part 60; or the NCASI Method IM/CAN/WP-99.02
(incorporated by reference (IBR), see 40 CFR 63.14(f)); or NCASI
Method ISS/FP-A105.01 (IBR, see 40 CFR 63.14(f); or ASTM D6348-03
(IBR, see 40 CFR 63.14(b)).
    (2) For pollutants measured using Method 29 in appendix A to 40
CFR part 60, you analyze samples using atomic absorption
spectroscopy (AAS) or another laboratory method specified in Method
29 in appendix A to 40 CFR part 60 with detection limits lower than
or equal to AAS.
    (g) For purposes of your low-risk demonstration, you must assume
that 17

percent of your total chromium measured using EPA Method 29 in
appendix A to 40 CFR part 60 is chromium VI. You must assume that 65
percent of your total nickel measured using EPA Method 29 in
appendix A to 40 CFR part 60 is nickel subsulfide.
    (h) You may use emission rates higher than your measured
emission rates (e.g., emissions rates 10 times your measured
emission rate) to facilitate ongoing certification (as required in
section 13 of this appendix) that your affected source remains in
the low-risk subcategory.
    (i) Use of previous emissions tests. You may use the results of
previous emissions tests provided that the following conditions are
met:
    (1) The previous emissions tests must have been conducted using
the methods specified in table 2B to this appendix. Previous
emission test results obtained using NCASI Method IM/CAN/WP-99.01
are acceptable.
    (2) The previous emissions tests must meet the requirements in
paragraphs (b) through (j) of this section.
    (3) The subject process unit(s) must be operated in a manner
(e.g., with raw material type, operating temperature, etc.) that
would be expected to result in the same or lower emissions than
observed during the previous emissions test(s) and the process
unit(s) may not have been modified such that emissions would be
expected to exceed (notwithstanding normal test-to-test variability)
the results from previous emissions test(s).
    (4) The previous emissions test(s) must have been conducted in
1997 or later.
    (j) Use of test data for similar process units. If you have
multiple similar process units at the same plant site, you may apply
the test results from one of these process units to the other
similar process units for purposes of your low-risk demonstration
provided that the following conditions are met:
    (1) You must explain how the process units are similar in terms
of design, function, heating method, raw materials processed,
residence time, change in material moisture content, operating
temperature, resin type processed, age, and any other parameters
that may affect emissions.
    (2) If the process units have different throughput rates, then
you must convert the emission test results to terms of pounds of HAP
per unit throughput prior to applying the emissions test data to
other similar process units.
    (3) If one of the process units would be expected to exhibit
higher emissions due to minor differences in process parameters,
then you must explain and test the process unit that would be
expected to exhibit greater emissions (for example, the unit with a
slightly higher temperature set point, dryer processing furnish with
slightly higher inlet moisture content, press processing thicker
panels, unit with the greater throughput, considerably older unit,
etc.).
    (k) If emissions estimation is allowed, you must follow the
procedures in (1) through (3) of this paragraph.
    (1) You must use the emission factors or other emission
estimation techniques specified in table 2A to this appendix when
developing emission estimates.
    (2) You must base your emission estimates on the maximum process
unit throughput you will incorporate into your permit according to
section 11(b) of this appendix.
    (3) For process units with multiple emission points, you must
apportion the estimate emissions evenly across each emission point.
For example, if you have a process unit with two emission points,
and the process unit is estimated to emit 6 lb/hr, you would assign
3 lb/hr to each emission point.
    (l) Testing of multiple stacks. You may test one of multiple
stacks for a process unit provided that the following conditions are
met:
    (1) The emissions are produced by the same process unit.
    (2) The emissions originate from the same duct.
    (3) The emissions are sufficiently mixed so that the gaseous
pollutant concentrations from one stack are not expected to differ
from concentrations from another stack.
    (m) Conducting a fuel analysis. For process units that require
testing of metals according to table 2A to this appendix, you may
conduct a fuel analysis in lieu of emissions tests. You must follow
the procedures described in Sec.  63.7521 (a) and (c) through (e) of
subpart DDDDD; Sec.  63.7530(d)(1), (2), and (4) of subpart DDDDD,
and line 2 of table 6 to subpart DDDDD. For purposes of this
appendix, the total selected metals analyzed by fuel analysis are
the metals included in table 1 to this appendix.

6. How do I conduct a look-up table analysis?

    Use the look-up tables (tables 3 and 4 to this appendix) to
demonstrate that your affected source is part of the low-risk
subcategory, following the procedures in paragraphs (a) through (d)
of this section.
    (a) Using the emission rate of each HAP required to be included
in your low-risk demonstration (determined according to section 5 of
this appendix), calculate your total toxicity-weighted carcinogen
and noncarcinogen emission rates for each of your emission points
using Equations 1 and 2 of this appendix, respectively. Calculate
your carcinogen and non-carcinogen weighted stack height using
Equations 3 and 4 of this appendix, respectively.
[GRAPHIC] [TIFF OMITTED] TR16FE06.000

TWCER = Toxicity-weighted carcinogenic emission rate for each
emission point (lb/hr)/([mu]g/m3)
ERi = Emission rate of pollutant i (lb/hr)
UREi = Unit risk estimate for pollutant i, 1 per
microgram per cubic meter ([mu]g/m3)-1
[GRAPHIC] [TIFF OMITTED] TR16FE06.001

TWNER = Toxicity-weighted noncarcinogenic emission rate for each
emission point (lb/hr)/([mu]g/m3)
ERi = Emission rate of pollutant i (lb/hr)
RfCi = Reference concentration for pollutant i,
micrograms per cubic meter ([mu]g/m3)
[GRAPHIC] [TIFF OMITTED] TR16FE06.002

WHC = Carcinogen weighted stack height for use in the carcinogen
look-up table (table 3 to this appendix)
H = Height of each individual stack or emission point (m)
ep = Individual stacks or emission points
n = Total number of stacks and emission points

[GRAPHIC] [TIFF OMITTED] TR16FE06.003

WHN = Non-carcinogen weighted stack height for use in the non-
carcinogen look-up table (table 4 to this appendix)
H = Height of each individual stack or emission point (m)
ep = Individual stacks or emission points
n = Total number of stacks and emission points

    (b) Cancer risk. Calculate the total toxicity-weighted
carcinogen emission rate for your affected source by summing the
toxicity-weighted carcinogen emission rates for each of your
emission points. Identify the appropriate maximum allowable
toxicity-weighted carcinogen emission rate from table 3 to this
appendix for your affected source using the carcinogen weighted
stack height of your emission points and the minimum distance
between any emission point at the affected source and the property
boundary. If one or both of these values do not match the exact
values in the look-up table, then use the next lowest table value.
(Note: If your weighted stack height is less than 5 meters (m), you
must use the 5 m row.) Your affected source is considered low risk
for carcinogenic effects if your toxicity-weighted carcinogen
emission rate, determined using the methods specified in this
appendix, does not exceed the values specified in table 3 to this
appendix.
    (c) Noncancer risk. Calculate the total central nervous system
(CNS) and respiratory target organ specific toxicity-weighted
noncarcinogen emission rate for your affected source by summing the
toxicity-weighted emission rates for each of your emission points.
Identify the appropriate maximum allowable toxicity-weighted
noncarcinogen emission rate from table 4 to this appendix for your
affected source using the non-carcinogen weighted stack height of
your emission points and the minimum distance between any emission
point at the affected source and the property boundary. If one or
both of these values do not match the exact values in the look-up
table, then use the next lowest table value. (Note: If your weighted
stack height is less than 5 m, you must use the 5 m row.) Your
affected source is considered low risk for noncarcinogenic effects
if your toxicity-weighted noncarcinogen emission rate, determined
using the methods specified in this appendix, does not exceed the
values specified in table 4 to this appendix.
    (d) Low-risk demonstration. The EPA will approve your affected
source as eligible for membership in the low-risk subcategory of
PCWP affected sources if it determines that: (1) Your affected
source is low risk for both carcinogenic and noncarcinogenic effects
using the look-up table analysis described in this section and (2)
you meet the criteria specified in section 11 of this appendix.

7. How do I conduct a site-specific risk assessment?

    (a) Perform a site-specific risk assessment following the
procedures specified in this section. You may use any
scientifically-accepted peer-reviewed assessment methodology for
your site-specific risk assessment. An example of one approach to
performing a site-specific risk assessment for air toxics that may
be appropriate for your affected source can be found in the ``Air
Toxics Risk Assessment Guidance Reference Library, Volume 2, Site-
Specific Risk Assessment Technical Resource Document.'' You may
obtain a copy of the ``Air Toxics Risk Assessment Reference
Library'' through EPA's air toxics Web site at http://www.epa.gov/ttn/fera/risk_atra_main.html
.

    (b) At a minimum, your site-specific risk assessment must:
    (1) Estimate the long-term inhalation exposures through the
estimation of annual or multi-year average ambient concentrations
for the chronic portion of the assessment.
    (2) Estimate the acute exposures for formaldehyde and acrolein
through the estimation of maximum 1-hour average ambient
concentrations for the acute portion of the assessment.
    (3) Estimate the inhalation exposure of the individual most
exposed to the affected source's emissions.
    (4) Estimate the individual risks over a 70-year lifetime for
the chronic cancer risk assessment.
    (5) Use site-specific, quality-assured data wherever possible.
    (6) Use health-protective default assumptions wherever site-
specific data are not available.
    (7) Contain adequate documentation of the data and methods used
for the assessment so that it is transparent and can be reproduced
by an experienced risk assessor and emission measurement expert.
    (c) Your site-specific risk assessment need not:
    (1) Assume any attenuation of exposure concentrations due to the
penetration of outdoor pollutants into indoor exposure areas.
    (2) Assume any reaction or deposition of the emitted pollutants
during transport from the emission point to the point of exposure.
    (d) Your affected source is considered low risk for carcinogenic
chronic inhalation effects if your site-specific risk assessment
demonstrates that maximum off-site individual lifetime cancer risk
at a location where people live or congregate (e.g., school or day
care center) is less than 1 in 1 million.
    (e) Your affected source is considered low risk for
noncarcinogenic chronic inhalation effects if your site-specific
risk assessment demonstrates that every maximum off-site target-
organ specific hazard index (TOSHI), or appropriate set of site-
specific hazard indices based on similar or complementary mechanisms
of action that are reasonably likely to be additive at low dose or
dose-response data for mixtures, at a location where people live is
less than or equal to 1.0.
    (f) Your affected source is considered low risk for
noncarcinogenic acute inhalation effects if your site-specific risk
assessment demonstrates that the maximum off-site acute hazard
quotients for both acrolein and formaldehyde are less than or equal
to 1.0.
    (g) The EPA will approve your affected source as eligible for
membership in the low-risk subcategory of PCWP affected sources if
it determines that: (1) your affected source is low risk for all of
the applicable effects listed in paragraphs (d) through (f) of this
section and (2) you meet the criteria specified in section 11 of
this appendix.

8. What information must I submit for the low-risk demonstration?

    (a) Your low-risk demonstration must include at a minimum the
information specified in paragraphs (a)(1) through (5) of this
section and the information specified in either paragraph (b) or (c)
of this section.
    (1) Identification of each process unit at the affected source.
    (2) Stack parameters for each emission point including, but not
limited to, the parameters listed in paragraphs (a)(2)(i) through
(iv) below:
    (i) Emission release type.
    (ii) Stack height, stack area, stack gas temperature, and stack
gas exit velocity.
    (iii) Plot plan showing all emission points, nearby residences,
and fenceline.
    (iv) Identification of any HAP control devices used to reduce
emissions from each process unit.
    (3) Emission test reports for each pollutant and process unit
based on the testing requirements and methods specified in tables 2A
and 2B to this appendix, including a description of the process
parameters identified as being worst case. You must submit your
emissions calculations for each pollutant and process unit for which
emissions estimates are developed. You must submit fuel analyses for
each fuel and emission point which has been conducted, including
collection and analytical methods used.
    (4) Identification of the dose-response values used in your risk
analysis (look-up table analysis or site-specific risk assessment),
according to section 4(b) of this appendix.
    (5) Identification of the controlling process factors
(including, but not limited to, production rate, emission rate, type
of control devices, process parameters documented as worst-case
conditions during the emissions testing used for your low-risk
demonstration) that will become Federally enforceable permit
conditions used to show

that your affected source remains in the low-risk subcategory.
    (b) If you use the look-up table analysis in section 6 of this
appendix to demonstrate that your affected source is low risk, your
low-risk demonstration must contain at a minimum the information in
paragraphs (a) and (b)(1) through (4) of this section.
    (1) Identification of the stack heights for each emission point
included in the calculations of weighted stack height.
    (2) Identification of the emission point with the minimum
distance to the property boundary.
    (3) Calculations used to determine the toxicity-weighted
carcinogen and noncarcinogen emission rates and weighted stack
heights according to section 6(a) of this appendix.
    (4) Comparison of the values in the look-up tables (tables 3 and
4 to this appendix) to your toxicity-weighted emission rates for
carcinogenic and noncarcinogenic HAP.
    (c) If you use a site-specific risk assessment as described in
section 7 of this appendix to demonstrate that your affected source
is low risk (for carcinogenic and noncarcinogenic chronic inhalation
and acute inhalation risks), your low-risk demonstration must
contain at a minimum the information in paragraphs (a) and (c)(1)
through (8) of this section.
    (1) Identification of the risk assessment methodology used.
    (2) Documentation of the fate and transport model used.
    (3) Documentation of the fate and transport model inputs,
including the information described in paragraphs (a)(1) through (4)
of this section converted to the dimensions required for the model
and all of the following that apply: meteorological data; building,
land use, and terrain data; receptor locations and population data;
and other facility-specific parameters input into the model.
    (4) Documentation of the fate and transport model outputs.
    (5) Documentation of exposure assessment and risk
characterization calculations.
    (6) Comparison of the maximum off-site individual lifetime
cancer risk at a location where people live to 1 in 1 million, as
required in section 7(d) of this appendix for carcinogenic chronic
inhalation risk.
    (7) Comparison of the maximum off-site TOSHI for respiratory
effects and CNS effects at a location where people live to the limit
of 1.0, as required in section 7(e) of this appendix for
noncarcinogenic chronic inhalation risk.
    (8) Comparison of the maximum off-site acute inhalation hazard
quotient (HQ) for both acrolein and formaldehyde to the limit of
1.0, as required in section 7(f) of this appendix for
noncancinogenic acute inhalation effects.
    (d) The EPA may request any additional information it determines
is necessary or appropriate to evaluate an affected source's low-
risk demonstration.

9. Where do I send my low-risk demonstration?

    You must submit your low-risk demonstration to the EPA for
review and approval. Send your low-risk demonstration either by e-
mail to<EMAIL_ADDRESS>or by U.S. mail or other mail delivery service
to U.S. EPA, Risk and Exposure Assessment Group, Emission Standards
Division (C404-01), Attn: Group Leader, Research Triangle Park, NC
27711, and send a copy to your permitting authority. Your affected
source is not part of the low-risk subcategory of PCWP facilities
unless and until EPA notifies you that it has determined that you
meet the requirements of section 11 of this appendix.

10. When do I submit my low-risk demonstration?

    (a) Existing affected sources. If you have an existing affected
source, you may complete and submit for approval your low-risk
demonstration (including the emission test results, fuel analyses,
and emission estimates required in this appendix) any time. Existing
affected sources that are not approved by EPA as being part of the
low-risk subcategory by October 1, 2008, must comply with the
requirements of 40 CFR part 63, subpart DDDD from October 1, 2008,
unless and until EPA approves them as part of the low-risk
subcategory.
    (b) Sources in compliance with 40 CFR part 63, subpart DDDD. If
you operate an affected source that is already in compliance with 40
CFR part 63, subpart DDDD (including, but not limited to, an
existing source, a new or reconstructed affected source starting up
before September 28, 2004, or a new source starting up after
September 28, 2004, but before February 16, 2006) and wish to become
part of the low-risk subcategory, then you may complete and submit
for approval your low-risk demonstration (including the emission
test results, fuel analyses, and emission estimates required in this
appendix) any time. Your affected source will become part of the
low-risk subcategory when EPA determines that the requirements in
section 11 of this appendix are met.
    (c) New or reconstructed affected sources wanting to be part of
the low-risk subcategory at startup must comply with the
requirements of paragraphs (c)(1) through (c)(3) of this section.
    (1)(i) You must complete and submit for review and approval a
pre-startup low-risk demonstration no later than nine months prior
to initial startup. The pre-startup low-risk demonstration must be
based on the information (e.g., equipment types, estimated emission
rates, etc.) that you will likely use to obtain your title V permit.
You must base your pre-startup low-risk demonstration on the maximum
emissions that will likely be allowed when you obtain your title V
permit.
    (ii) You must request that your affected source become part of
the low-risk subcategory based on your pre-startup low-risk
demonstration.
    (iii) If EPA approves your pre-startup low-risk demonstration,
then your affected source will be part of the low-risk subcategory
upon approval of the pre-startup low-risk demonstration and you may
start up your affected source without complying with the compliance
options, operating requirements, and work practice requirements in
40 CFR part 63, subpart DDDD, provided that you operate your
affected source consistently with the pre-startup low-risk
demonstration until you meet the criteria in section 11 of this
appendix based on your verification low-risk demonstration developed
according to paragraph (c)(2) of this section. Failure to so operate
will render approval of your pre-startup low-risk demonstration null
and void from the date you startup your affected source.
    (2)(i) You must complete and submit your verification low-risk
demonstration, including the results from emission tests (or fuel
analyses) required in this appendix, within 240 days following
initial startup. The verification low-risk demonstration must
demonstrate to EPA's satisfaction that the affected source is low
risk. The verification low-risk demonstration may be used to change
operating parameters ensuring low-risk status.
    (ii) If you do not submit the verification low-risk
demonstration as required, or the verification low-risk
demonstration does not verify that the affected source is low risk,
then approval of your pre-startup low-risk demonstration is null and
void from the date you startup your affected source and you must
comply immediately with subpart DDDD of 40 CFR part 63.
    (3) To incorporate the low-risk parameters from your
verification low-risk demonstration into your title V permit, you
must submit your application for a significant modification to your
title V permit within 1 year following initial startup, or earlier
if so required under your State's permit program approved under 40
CFR part 70. The parameters that defined your affected source as
part of the low-risk subcategory (including, but not limited to,
production rate, emission rate, type of control devices, process
parameters reflecting the emissions rates used for your low-risk
demonstration, and stack height) must be submitted for incorporation
as federally enforceable terms and conditions into your title V
permit. You must provide written certification to the permitting
authority that your affected source is operating consistently with
its EPA-approved pre-startup low-risk demonstration and verification
low-risk demonstration, as applicable, from startup until your title
V permit revision is issued.
    (d) New or reconstructed affected sources that want to operate
consistently with a pre-startup low-risk demonstration at startup
and become part of the low-risk subcategory based on EPA approval of
their verification low-risk demonstration (rather than based on
their pre-startup low-risk demonstration), must comply with the
requirements in paragraphs (d)(1) through (d)(3) of this section.
    (1)(i) You must complete and submit for review a pre-startup
low-risk demonstration no later than nine months prior to initial
startup. The pre-startup low-risk demonstration must be based on the
information (e.g., equipment types, estimated emission rates, etc.)
that you will likely use to obtain your title V permit. You must
base your pre-startup low-risk demonstration on the maximum
emissions that will likely be allowed when you obtain your title V
permit.
    (ii) If EPA concludes that your pre-startup low-risk
demonstration is complete and

sufficiently shows that your affected source appears to be eligible
for inclusion in the low-risk subcategory, then you must operate
your affected source consistently with the pre-startup low-risk
demonstration until EPA determines that you meet the criteria in
section 11 of this appendix based on your verification low-risk
demonstration developed according to paragraph (d)(2) of this
section.
    (2)(i) You must complete and submit for EPA review and approval
your verification low-risk demonstration, including the results from
emission tests (or fuel analyses) required in this appendix, within
240 days following initial startup. The verification low-risk
demonstration must demonstrate to EPA's satisfaction that the
affected source is low risk.
    (ii) You will become part of the low-risk subcategory when EPA
determines that you meet the criteria in section 11 of this appendix
based upon your verification low-risk demonstration. If you do not
submit the verification low-risk demonstration as required, or the
verification low-risk demonstration does not verify that the
affected source is low risk, then EPA will not approve your low-risk
demonstration and you will remain subject to subpart DDDD of 40 CFR
part 63.
    (3) To incorporate the low-risk parameters from your
verification low-risk demonstration into your title V permit, you
must submit your application for a significant modification to your
title V permit within 1 year following initial startup, or earlier
if so required by your State's permit program approved by EPA under
40 CFR part 70. The parameters that defined your affected source as
part of the low-risk subcategory (including, but not limited to,
production rate, emission rate, type of control devices, process
parameters reflecting the emissions rates used for your low-risk
demonstration, and stack height) must be submitted for incorporation
as federally enforceable terms and conditions into your title V
permit. You must provide written certification to the permitting
authority that your affected source is operating consistently with
its pre-startup LRD and your verification LRD, as applicable, from
startup until your title V permit revision is issued.
    (e) Area sources that become affected sources. If you have an
affected source that is an area source that increases its emissions
or its potential to emit such that it becomes a major source of HAP
before September 28, 2004, then you must complete and submit for
approval your low-risk demonstration as specified in paragraph (a)
of this section. If you have an affected source that is an area
source that increases its emissions or its potential to emit such
that it becomes a major source of HAP after September 28, 2004, then
you must complete and submit for approval your low-risk
demonstration as specified in paragraphs (b), (c) or (d) of this
section, whichever applies.

11. How does my affected source become part of the low-risk subcategory
of PCWP facilities?

    For existing sources to be included in the low-risk subcategory,
EPA must find that you meet the criteria in paragraphs (a) and (b)
of this section. For new sources to be included in the low-risk
subcategory, EPA must find that you meet the criteria in paragraph
(a) of this section. Unless and until EPA finds that you meet these
criteria, your affected source is subject to the applicable
compliance options, operating requirements, and work practice
requirements in 40 CFR part 63, subpart DDDD.
    (a) Your demonstration of low risk must be approved by EPA.
    (b) Following EPA approval, the parameters that defined your
affected source as part of the low-risk subcategory (including, but
not limited to, production rate, emission rate, type of control
devices, process parameters reflecting the emissions rates used for
your low-risk demonstration, and stack height) must be submitted for
incorporation as federally enforceable terms and conditions into
your title V permit. You must submit an application for a
significant permit modification to reopen your title V permit to
incorporate such terms and conditions according to the procedures
and schedules of 40 CFR part 71 or the EPA-approved program in
effect under 40 CFR part 70, as applicable.

12. What must I do to ensure my affected source remains in the low-risk
subcategory of PCWP facilities?

    You must meet the requirements in table 2 to 40 CFR part 63,
subpart DDDD, for each HAP control device used at the time when you
completed your low-risk demonstration. You must monitor and collect
data according to Sec.  63.2270 of subpart DDDD to show continuous
compliance with your control device operating requirements. You must
demonstrate continuous compliance with the control device operating
requirements that apply to you by collecting and recording the
monitoring system data listed in table 2 to 40 CFR part 63, subpart
DDDD for the process unit according to Sec. Sec.  63.2269(a), (b),
and (d) of subpart DDDD; and reducing the monitoring system data to
the specified averages in units of the applicable requirement
according to calculations in Sec.  63.2270 of subpart DDDD; and
maintaining the average operating parameter at or above the minimum,
at or below the maximum, or within the range (whichever applies)
established according to section 5(e) of this appendix.

13. What happens if the criteria used in the risk determination change?

    (a) You must certify with each annual title V permit compliance
certification that the basis for your affected source's low-risk
determination has not changed. You must submit this certification to
the permitting authority. You must consider the changes in
paragraphs (a)(1) through (5) of this section.
    (1) Process changes that increase HAP emissions, including, but
not limited to, a production rate increase, an emission rate
increase, a change in type of control device, changes in process
parameters reflecting emissions rates used for your approved low-
risk demonstration.
    (2) Population shifts, such as if people move to a different
location such that their risks from the affected source increase.
    (3) Unit risk estimate increases posted on the EPA Web site
(http://www.epa.gov/ttn/atw/toxsource/summary.html) for the

pollutants included in table 1 to this appendix.
    (4) Reference concentration changes posted on the EPA Web site
(http://www.epa.gov/ttn/atw/toxsource/summary.html) for the

pollutants included in table 1 to this appendix.
    (5) Acute dose-response value for formaldehyde or acrolein
changes.
    (b) If your affected source commences operating outside of the
low-risk subcategory, it is no longer part of the low-risk
subcategory. You must be in compliance with 40 CFR part 63, subpart
DDDD as specified in paragraphs (b)(1) through (3) of this section.
Operating outside of the low-risk subcategory means that one of the
changes listed in paragraphs (a)(1) through (5) of this section has
occurred and that the change is inconsistent with your affected
source's title V permit terms and conditions reflecting EPA's
approval of the parameters used in your low-risk demonstration.
    (1) You must notify the permitting authority as soon as you
know, or could have reasonably known, that your affected source is
or will be operating outside of the low-risk subcategory.
    (2) You must be in compliance with the requirements of 40 CFR
part 63, subpart DDDD as specified in paragraph (b)(2)(i) or (ii) of
this section, whichever applies.
    (i) If you are operating outside of the low-risk subcategory due
to a change described in paragraph (a)(1) of this section, then you
must comply with 40 CFR part 63, subpart DDDD beginning on the date
when your affected source commences operating outside the low-risk
subcategory.
    (ii) If you are operating outside of the low-risk subcategory
due to a change described in paragraphs (a)(2) through (5) of this
section, then you must comply with 40 CFR part 63, subpart DDDD no
later than 3 years from the date your affected source commences
operating outside the low-risk subcategory.
    (3)(i) You must conduct performance tests no later than 180
calendar days after the applicable date specified in paragraph
(b)(2) of this section.
    (ii) You must conduct initial compliance demonstrations that do
not require performance tests 30 calendar days after the applicable
date specified in paragraph (b)(2) of this section.
    (iii) For the purposes of affected sources affected by this
section, you must refer to the requirements in paragraph (b) of this
section instead of the requirements of Sec.  63.2233 when complying
with 40 CFR part 63, subpart DDDD.

14. What records must I keep?

    (a) You must keep records of the information used in developing
the low-risk demonstration for your affected source, including all
of the information specified in section 8 of this appendix.
    (b) You must keep records demonstrating continuous compliance
with the operating requirements for control devices.
    (c) For each THC CEMS, you must keep the records specified in
Sec.  63.2282(c) of 40 CFR part 63, subpart DDDD.

15. Definitions

    The definitions in Sec.  63.2292 of 40 CFR part 63, subpart
DDDD, apply to this appendix. Additional definitions applicable for
this appendix are as follows:
    Agricultural fiber board press means a press used in the
production of an agricultural fiber based composite wood product. An
agricultural fiber board press is a process unit.
    Agricultural fiberboard mat dryer means a dryer used to reduce
the moisture of wet-formed agricultural fiber mats by applying heat.
An agricultural fiberboard mat dryer is a process unit.
    Ancillary processes mean equipment and process units that are
part of the PCWP affected source that are not defined elsewhere in
this section or in section 63.2292 of subpart DDDD. Ancillary
processes at a specific facility do not include the equipment and
process units identified as insignificant sources of HAP emissions
by that facility, and they do not include equipment and process
units subject to another standard under 40 CFR part 63. Ancillary
processes may be or may not be HAP emissions sources.
    Ancillary processes are process units.
    Atmospheric refiner means a piece of equipment operated under
atmospheric pressure for refining (rubbing or grinding) the wood
material into fibers or particles. Atmospheric refiners are operated
with continuous infeed and outfeed of wood material and atmospheric
pressures throughout the refining process. An atmospheric refiner is
a process unit.
    Blending and forming operations means the process of mixing
adhesive and other additives with the (wood) furnish of the
composite panel and making a mat of resinated fiber, particles, or
strands to be compressed into a reconstituted wood product such as
particleboard, oriented strandboard, or medium density fiberboard.
Blending and forming operations are process units.
    Emission point means an individual stack or vent from a process
unit that emits HAP required for inclusion in the low-risk
demonstration specified in this appendix. Process units may have
multiple emission points.
    Fiber washer means a unit in which water-soluble components of
wood (hemicellulose and sugars) that have been produced during
digesting and refining are removed from the wood fiber. Typically
wet fiber leaving a refiner is further diluted with water and then
passed over a filter, leaving the cleaned fiber on the surface. A
fiber washer is a process unit.
    Finishing sander means a piece of equipment that uses an
abrasive drum, belt, or pad to impart smoothness to the surface of a
plywood or composite wood product panel and to reduce the panel to
the prescribed thickness. A finishing sander is a process unit.
    Finishing saw means a piece of equipment used to trim or cut
finished plywood and composite wood products panels to a certain
size. A finishing saw is a process unit.
    Hardwood plywood press means a hot press which, through heat and
pressure, bonds assembled hardwood veneers (including multiple plies
of veneer and/or a substrate) and resin into a hardwood plywood
panel. A hardwood plywood press is a process unit.
    Hardwood veneer kiln means an enclosed dryer operated in batch
cycles by applying heat to reduce the moisture content from stacked
hardwood veneer. A hardwood veneer kiln is a process unit.
    Hazard Index (HI) means the sum of more than one hazard quotient
for multiple substances and/or multiple exposure pathways.
    Hazard Quotient (HQ) means the ratio of the predicted media
concentration of a pollutant to the media concentration at which no
adverse effects are expected. For inhalation exposures, the HQ is
calculated as the air concentration divided by the reference
concentration (RfC).
    Humidifier means a process unit used to increase the moisture
content of hardboard following pressing or after post-baking.
Typically, water vapor saturated air is blown over the hardboard
surfaces in a closed cabinet. A humidifier is a process unit.
    I-joist curing chamber means an oven or a room surrounded by a
solid wall or heavy plastic flaps that uses heat, infrared, or
radio-frequency techniques to cure the adhesive. An I-joist curing
chamber is a process unit.
    Log chipping means the production of wood chips from logs.
    Log vat means a process unit that raises the temperature of the
logs inside by applying a heated substance, usually hot water and
steam, to the outside of the logs by spraying or soaking. A log vat
is a process unit.
    Look-up table analysis means a risk screening analysis based on
comparing the toxicity-weighted HAP emission rate from the affected
source to the maximum allowable toxicity-weighted HAP emission rates
specified in tables 3 and 4 to this appendix.
    LSL press means a composite wood product press that presses a
loose mat of resinated strands into a billet by simultaneous
application of heat and pressure. The billet is cut into laminated
strand lumber after exiting the press. An LSL press is a process
unit.
    LVL or PSL press means a composite wood product press that
presses resinated stacks of veneers into a solid billet by
application of heat and/or pressure. The billet is cut into
laminated veneer lumber or parallel strand lumber after exiting the
press. An LVL or PSL press is a process unit.
    Natural gas means a naturally occurring mixture of hydrocarbon
and non-hydrocarbon gases found in geologic formations beneath the
earth's surface. The principal hydrocarbon constituent is methane.
    Paddle-type particleboard dryer means a dryer to which heat is
applied to remove moisture from particles and paddles to advance
materials through the dryer. This type of dryer removes moisture
absorbed by particles due to high ambient temperature. A paddle-type
particleboard dryer is a process unit.
    Panel-trim chipper means a piece of equipment that accepts the
discarded pieces of veneer or pressed plywood and composite wood
products panels that are removed by finishing saws and reduces these
pieces to small elements. A panel-trim chipper is a process unit.
    Particleboard extruder means a heated die oriented either
horizontally or vertically through which resinated particles are
continuously forced to form extruded particleboard products. A
particleboard extruder is a process unit.
    Particleboard press mold means a press that consists of molds
that apply heat and pressure to form molded or shaped particleboard
products. A particleboard press mold is a process unit.
    Propane means a colorless gas derived from petroleum and natural
gas, with the molecular structure C3H8.
    Radio-frequency veneer redryer means a dryer heated by radio-
frequency waves that is used to redry veneer that has been
previously dried. A radio-frequency veneer redryer is a process
unit.
    Reference Concentration (RfC) means an estimate (with
uncertainty spanning perhaps an order of magnitude) of a continuous
inhalation exposure to the human population (including sensitive
subgroups) that is likely to be without an appreciable risk of
deleterious effects during a lifetime. It can be derived from
various types of human or animal data, with uncertainty factors
generally applied to reflect limitations of the data used.
    Resin storage tank means any storage tank, container, or vessel
connected to plywood and composite wood product production that
holds resin additives (in liquid form) containing any of the HAP
listed in table 2A to this appendix. A resin storage tank is a
process unit.
    Rotary agricultural fiber dryer means a rotary dryer operated by
applying heat to reduce the moisture of agricultural fiber. A rotary
agricultural fiber dryer is a process unit.
    Softwood plywood press means a hot press which, through heat and
pressure, bonds assembled softwood veneer plies and resin into a
softwood plywood panel. A softwood plywood press is a process unit.
    Softwood veneer kiln means an enclosed dryer operated in batch
cycles by applying heat to reduce the moisture content from stacked
softwood veneer. A softwood veneer kiln is a process unit.
    Stand-alone digester means a pressure vessel used to heat and
soften wood chips (usually by steaming) before the chips are sent to
a separate process unit for refining into fiber. A stand-alone
digester is a process unit.
    Target organ specific hazard index (TOSHI) means the sum of
hazard quotients for individual chemicals that affect the same organ
or organ system (e.g., respiratory system, central nervous system).
    Unit Risk Estimate (URE) means the upper-bound excess lifetime
cancer risk estimated to result from continuous exposure to an agent
at a concentration of 1 microgram per cubic meter ([mu]g/
m3) in air.
    Wastewater/process water operation means equipment that
processes water in plywood or composite wood product facilities for

reuse or disposal. Wastewater/process water operations includes but
is not limited to pumps, holding ponds and tanks, cooling and
heating operations, settling systems, filtration systems, aeration
systems, clarifiers, pH adjustment systems, log storage ponds,
pollution control device water (including wash water), vacuum
distillation systems, sludge drying and disposal systems, spray
irrigation fields, and connections to POTW facilities. Wastewater/
process water operations are process units.
    Worst-case operating conditions means operation of a process
unit during emissions testing under the conditions that result in
the highest HAP emissions or that result in the emissions stream
composition (including HAP and non-HAP) that is most challenging for
the control device if a control device is used. For example, worst
case conditions could include operation of the process unit at
maximum throughput, at its highest temperature, with the wood
species mix likely to produce the most HAP, and/or with the resin
formulation containing the greatest HAP.

 Table 1 to Appendix B to Subpart DDDD of 40 CFR Part 63.--HAP That Must
  Be Included in the Demonstration of Eligibility for the Low-risk PCWP
                               Subcategory
------------------------------------------------------------------------
   For your analysis of the following     You must include the following
             effects . . .                          HAP . . .
------------------------------------------------------------------------
(1) Chronic inhalation carcinogenic      acetaldehyde, benzene, arsenic,
 effects.                                 beryllium, cadmium, chromium,
                                          lead, nickel, and
                                          formaldehyde.
(2) Chronic inhalation noncarcinogenic   acetaldehyde, acrolein,
 respiratory effects.                     cadmium, formaldehyde, and
                                          methylene diphenyl
                                          diisocyanate (MDI).
(3) Chronic inhalation noncarcinogenic   manganese, lead, and phenol.
 CNS effects.
(4) Acute inhalation...................  acrolein and formaldehyde.
------------------------------------------------------------------------

                                  Table 2A to Appendix B to Subpart DDDD of 40 CFR Part 63.--Testing and Emissions Estimation Specifications for Process Units
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                                HAP metals from
        Process unit type               Acetaldehyde             Acrolein             Formaldehyde              Phenol                Benzene                  MDI          direct-fired process
                                                                                units \a\
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Agricultural fiberboard mat        Test.................  Test.................  Test.................  Test.................  Test.................  NA..................  Test or fuel
 dryers, Dry rotary dryers,                                                                                analysis.
 Fiberboard mat dryer (heated
 zones), Green rotary dryers,
 Hardboard ovens, Hardwood veneer
 dryers (heated zones), Paddle-
 type particleboard dryers, Press
 predryers, Rotary agricultural
 fiber dryers, Rotary strand
 dryers, Softwood veneer dryers
 (heated zones), Veneer redryers
 (heated by conventional means).
Atmospheric refiners, Conveyor     Test.................  Test.................  Test.................  Test.................  Test.................  NA..................  NA.
 strand dryers, Pressurized
 refiners.
Primary tube dryers, Secondary     Test.................  Test.................  Test.................  Test.................  Test.................  Test if processing    Test or fuel
 tube dryers.                                                                                furnish with MDI      analysis.
                                                                                resin added prior
                                                                                to drying.
Agricultural fiber board presses,  Test.................  Test.................  Test.................  Test.................  Test.................  Test if board         NA
 Reconstituted wood products                                                                                contains MDI resin.
 presses, Reconstituted wood
 product board coolers.
Blending and forming operations--  NA...................  NA...................  0.060 lb/ODT\b\......  NA...................  NA...................  Engineering estimate  NA.
 particleboard and MDF.                                                                                if MDI resin used.
Blending and forming operations--  NA...................  NA...................  0.0036 lb/MSF \3/8\''  Engineering estimate.  NA...................  Engineering estimate  NA.
 OSB.                                                                             press throughput.                                                    if MDI resin used.
Dry forming--hardboard...........  Engineering estimate.  NA...................  Engineering estimate.  Engineering estimate.  NA...................  NA..................  NA.
Fiber washers....................  0.015 lb/ODT.........  NA...................  0.0026 lb/ODT........  NA...................  NA...................  NA..................  NA.
Fiberboard mat dryer (fugitive     0.0055 lb/MSF \1/2\''  NA...................  0.031 lb/MSF \1/2\''.  NA...................  NA...................  NA..................  NA.
 emissions).

Finishing sanders................  0.0031 lb/MSF........  NA...................  0.0042 lb/MSF........  0.015 lb/MSF.........  NA...................  Engineering estimate  NA.
                                                                                if MDI resin used.
Finishing saws...................  0.00092 lb/MSF \3/     NA...................  0.00034 lb/MSF \3/     0.0057 lb/MSF........  NA...................  Engineering estimate  NA.
                                    8\''.                                         8\''.                                                                if MDI resin used.
Hardwood plywood presses.........  NA...................  NA...................  0.0088 lb/MSF \3/8\''  0.016 lb/MSF \3/8\''.  NA...................  NA..................  NA.
Hardwood veneer dryer (cooling     0.058 lb/MSF \3/8\''.  NA...................  0.013 lb/MSF \3/8\''.  NA...................  NA...................  NA..................  NA.
 zones).
Hardwood veneer kilns............  0.067 lb/MSF \3/8\''.  NA...................  0.016 lb/MSF \3/8\''.  0.0053 lb/MSF \3/      NA...................  NA..................  NA.
                                                                                8\'',.
Humidifiers......................  0.0018 lb/MSF \1/8\''  0.0087 lb/MSF \1/8\''  0.0010 lb/MSF \1/8\''  0.00057 lb/MSF \1/     0.0000062 lb/MSF \1/   NA..................  NA.
                                                                                8\''.                  8\''.
I-joist curing chambers..........  NA...................  NA...................  0.00018 lb/MLF.......  NA...................  NA...................  Engineering estimate  NA.
                                                                                if MDI resin used.
Log vats.........................  0.0047 lb/MSF \3/8\''  NA...................  NA...................  NA...................  NA...................  NA..................  NA.
                                    removed from vat per
                                    hour.
LSL presses......................  Engineering estimate.  NA...................  0.029 lb/1000 ft\3\..  Engineering estimate.  NA...................  0.18 lb/1000 ft\3\..  NA.
LVL presses......................  0.29 lb/1000 ft\3\...  NA...................  0.79 lb/1000 ft\3\...  NA...................  NA...................  NA..................  NA.
Lumber kilns.....................  0.065 lb/MBF or        0.009 lb/MBF or        0.034 lb/MBF or        0.010 lb/MBF or        NA...................  NA..................  Engineering
                                    conduct small-scale    conduct small-scale    conduct small-scale    conduct small-scale                                                 estimate.
                                    kiln testing           kiln testing           kiln testing           kiln testing
                                    according to           according to           according to           according to
                                    appendix C to          appendix C to          appendix C to          appendix C to
                                    subpart DDDD.          subpart DDDD.          subpart DDDD.          subpart DDDD.
Panel-trim chippers..............  0.00081 lb/MSF \3/     NA...................  0.00034 lb/MSF \3/     0.0019 lb/MSF \3/8\''  NA...................  NA..................  NA.
                                    8\'' finished board                           8\'' finished board    finished board
                                    production.                                   production.            production.
Particleboard press molds,         0.034 lb/MSF \3/4\''.  0.0087 lb/MSF \3/4\''  0.64 lb/MSF \3/4\''..  0.024 lb/MSF \3/4\''.  0.0073 lb/MSF \3/4\''  NA..................  NA.
 Particleboard extruders.
Radio-frequency veneer redryers..  0.0029 lb/MSF \3/8\''  NA...................  0.00065 lb/MSF \3/     NA...................  NA...................  NA..................  NA.
                                                                                8\''.
Resin storage tanks--closed roof.  NA...................  NA...................  For tanks with resin   For tanks with resin   NA...................  For tanks with MDI    NA.
                                                                                containing             containing phenol,                            resin, 0.0013 lb/hr
                                                                                formaldehyde, 0.001    0.0002 lb/hr per                              per tank OR model
                                                                                lb/hr per tank OR      tank OR model using                           using TANKS
                                                                                model using TANKS      TANKS software\c\.                            software\c\.
                                                                                software\c\.
Resin storage tanks--open roof...  NA...................  NA...................  Engineering estimate   Engineering estimate   NA...................  Engineering estimate  NA.
                                                                                if resin contains      if resin contains                             if resin contains
                                                                                formaldehyde.          phenol.                                       MDI.
Softwood plywood presses.........  0.012 lb/MSF \3/8\''.  NA...................  0.0054 lb/MSF \3/8\''  0.0022 lb/MSF \3/8\''  NA...................  NA..................  NA.
Softwood veneer dryers (cooling    0.012 lb/MSF \3/8\''.  NA...................  0.0028 lb/MSF \3/8\''  0.011 lb/MSF \3/8\''.  NA...................  NA..................  NA.
 zones).
Softwood veneer kilns............  0.097 lb/MSF \3/8\''.  0.012 lb/MSF \3/8\''.  0.10 lb/MSF \3/8\''..  0.020 lb/MSF \3/8\''.  0.0078 lb/MSF \3/8\''  NA..................  NA.

Stand-alone digesters............  0.030 lb/ODT.........  0.0024 lb/ODT........  0.0045 lb/ODT........  0.0012 lb/ODT........  NA...................  NA..................  NA.
Wastewater/process water           Engineering estimate   Engineering estimate   Engineering estimate   Engineering estimate   Engineering estimate   NA..................  NA.
 operations.                        (such as WATER9\c\     (such as WATER9\c\     (such as WATER9\c\     (such as WATER9\c\     (such as WATER9\c\
                                    or other method).      or other method).      or other method).      or other method).      or other method).
Wet forming--fiberboard and        0.0075 lb/MSF \1/2\''  NA...................  0.0036 lb/MSF \1/2\''  NA...................  NA...................  NA..................  NA.
 hardboard (without PF resin).
Wet forming--hardboard (PF resin)  0.0067 lb/ODT........  NA...................  0.00039 lb/ODT.......  0.00075 lb/ODT.......  NA...................  NA..................  NA.
Miscellaneous coating operations,  NA...................  NA...................  NA...................  NA...................  NA...................  NA..................  NA.
 Log chipping, Softwood veneer
 dryer fugitive emissions.
Other ancillary processes (not     Engineering estimate.  Engineering estimate.  Engineering estimate.  Engineering estimate.  Engineering estimate.  Engineering estimate  Engineering
 listed elsewhere in this table)                                                                                estimate.
 that may emit HAP listed in this
 table.
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Test: Emissions testing must be conducted for the process unit and pollutant according to the test methods specified in table 2B to appendix B to subpart DDDD.
NA: Not applicable. No emission estimates or emissions tests are required for purposes of the low-risk demonstration.
lb/MSF: Pounds of HAP per thousand square feet of board of the inches thickness specified (e.g., lb/MSF \3/4\ = pounds of HAP per thousand square feet of \3/4\-inch board). See equation in
  Sec.   63.2262(j) of subpart DDDD to convert from one thickness basis to another.
lb/ODT: Pounds of HAP per oven dried ton of wood material.
lb/MBF: Pounds of HAP per thousand board feet.
lb/MLF: Pounds of HAP per thousand linear feet
\a\ Direct-fired process units firing natural gas or propane are NA; thus, no emissions estimates, emissions tests, or fuel analyses are required for the purposes of the low-risk
  demonstration.
\b\ Estimation of formaldehyde emissions is only necessary for facilities that use resin containing formaldehyde.
\c\ TANKS and WATER9 software is available at http://www.epa.gov/ttn/chief/software/index.html.

Table 2B to Appendix B to Subpart DDDD of 40 CFR part 63.--Emission Test
                                 Methods
------------------------------------------------------------------------
          For . . .              You must . . .          Using . . .
------------------------------------------------------------------------
(1) each process unit         select sampling       Method 1 or 1A of 40
 required to be tested         ports' location and   CFR part 60,
 according to table 2A to      the number of         appendix A (as
 this appendix.                traverse points.      appropriate).
(2) each process unit         determine velocity    Method 2 in addition
 required to be tested         and volumetric flow   to Method 2A, 2C,
 according to table 2A to      rate;.                2D, 2F, or 2G in
 this appendix.                                      appendix A to 40
                                                     CFR part 60 (as
                                                     appropriate).
(3) each process unit         conduct gas           Method 3, 3A, or 3B
 required to be tested         molecular weight      in appendix A to 40
 according to table 2A to      analysis.             CFR part 60 (as
 this appendix.                                      appropriate).
(4) each process unit         measure moisture      Method 4 in appendix
 required to be tested         content of the        A to 40 CFR part
 according to table 2A to      stack gas.            60.
 this appendix.
(5) each process unit         measure emissions of  NCASI Method IM/CAN/
 required to be tested         acetaldehyde.         WP-99.02 (IBR, see
 according to table 2A to                            40 CFR 63.14(f));
 this appendix.                                      OR Method 320 in
                                                     appendix A to 40
                                                     CFR part 63; OR the
                                                     NCASI Method ISS/FP-
                                                     A105.01 (IBR, see
                                                     Sec.   63.14(f));
                                                     OR Method 0011 in
                                                     ``Test Methods for
                                                     Evaluating Solid
                                                     Waste, Physical/
                                                     Chemical Methods''
                                                     (EPA Publication
                                                     No. SW-846); OR
                                                     ASTM D6348-03\b\
                                                     (IBR, see 40 CFR
                                                     63.14(b)).
(6) each process unit         measure emissions of  NCASI Method IM/CAN/
 required to be tested         acrolein.             WP-99.02 (IBR, see
 according to table 2A to                            40 CFR 63.14(f));
 this appendix.                                      OR Method 320 in
                                                     appendix A to 40
                                                     CFR part 63; OR the
                                                     NCASI Method ISS/FP-
                                                     A105.01 (IBR, see
                                                     Sec.   63.14(f));
                                                     OR ASTM D6348-03 b
                                                     (IBR, see 40 CFR
                                                     63.14(b)).

(7) each process unit         measure emissions of  NCASI Method IM/CAN/
 required to be tested         formaldehyde.         WP-99.02 (IBR, see
 according to table 2A to                            40 CFR 63.14(f));
 this appendix.                                      OR Method 320 in
                                                     appendix A to 40
                                                     CFR part 63; OR the
                                                     NCASI Method ISS/FP-
                                                     A105.01 (IBR, see
                                                     Sec.   63.14(f));
                                                     OR the NCASI Method
                                                     CI/WP-98.01; OR
                                                     Method 316 in
                                                     appendix A to 40
                                                     CFR part 63; OR
                                                     Method 0011 in
                                                     ``Test Methods for
                                                     Evaluating Solid
                                                     Waste, Physical/
                                                     Chemical Methods''
                                                     (EPA Publication
                                                     No. SW-846); OR
                                                     ASTM D6348-03 b
                                                     (IBR, see 40 CFR
                                                     63.14(b)).
(8) each process unit         measure emissions of  NCASI Method IM/CAN/
 required to be tested         phenol.               WP-99.02 (IBR, see
 according to table 2A to                            40 CFR 63.14(f));
 this appendix.                                      OR Method 320 in
                                                     appendix A to 40
                                                     CFR part 63; OR the
                                                     NCASI Method ISS/FP-
                                                     A105.01 (IBR, see
                                                     Sec.   63.14(f));
                                                     OR the NCASI Method
                                                     CI/WP-98.01; OR
                                                     ASTM D6348-03 b
                                                     (IBR, see 40 CFR
                                                     63.14(b)).
(9) each process unit         measure emissions of  Method 18 in
 required to be tested         benzene.              appendix A to 40
 according to table 2A to                            CFR part 60; OR
 this appendix.                                      NCASI Method IM/CAN/
                                                     WP-99.02 (IBR, see
                                                     40 CFR 63.14(f));
                                                     OR Method 320 in
                                                     appendix A to 40
                                                     CFR part 63; OR
                                                     ASTM D6348-03 b
                                                     (IBR, see 40 CFR
                                                     63.14(b)).
(10) each process unit that   measure emissions of  Method 320 in
 processes material            MDI.                  appendix A to 40
 containing MDI resin                                CFR part 63; OR
 required to be tested                               Method 207 in
 according to table 2A to                            appendix M to 40
 this appendix.                                      CFR part 51; OR
                                                     Conditional Test
                                                     Method (CTM) 031
                                                     which is posted on
                                                     http://www.epa.gov/
                                                     ttn/emc/ctm.html

(11) each direct-fired        measure emissions of  Method 29 in
 process unit a required to    the following HAP     appendix A to 40
 be tested according to        metals: Arsenic,      CFR part 60 OR fuel
 table 2A to this appendix.    beryllium, cadmium,   analysis (see
                               chromium, lead,       section 5(m) of
                               manganese, and        this appendix).
                               nickel..
(12) each reconstituted wood  meet the design       Methods 204 and 204A
 product press or              specifications        through 204F of 40
 reconstituted wood product    included in the       CFR part 51,
 board cooler with a HAP       definition of wood    appendix M to
 control device.               products enclosure    determine capture
                               in Sec.   63.2292     efficiency (except
                               of subpart DDDD of    for wood products
                               40 CFR part 63; or    enclosures as
                              determine the          defined in Sec.
                               percent capture       63.2292).
                               efficiency of the     Enclosures that
                               enclosure directing   meet the definition
                               emissions to an add-  of wood products
                               on control device.    enclosure or that
                                                     meet Method 204
                                                     requirements for a
                                                     PTE are assumed to
                                                     have a capture
                                                     efficiency of 100
                                                     percent. Enclosures
                                                     that do not meet
                                                     either the PTE
                                                     requirements or
                                                     design criteria for
                                                     a wood products
                                                     enclosure must
                                                     determine the
                                                     capture efficiency
                                                     by constructing a
                                                     TTE according to
                                                     the requirements of
                                                     Method 204 and
                                                     applying Methods
                                                     204A through 204F
                                                     (as appropriate).
                                                    As an alternative to
                                                     Methods 204 and
                                                     204A through 204F,
                                                     you may use the
                                                     tracer gas method
                                                     contained in
                                                     appendix A to
                                                     subpart DDDD.
(13) each reconstituted wood  determine the         a TTE and Methods
 product press or              percent capture       204 and 204A
 reconstituted wood product    efficiency.           through 204F (as
 board cooler required to be                         appropriate) of 40
 tested according to table                           CFR part 51,
 2A to this appendix.                                appendix M. As an
                                                     alternative to
                                                     installing a TTE
                                                     and using Methods
                                                     204 and 204A
                                                     through 204F, you
                                                     may use the tracer
                                                     gas method
                                                     contained in
                                                     appendix A to
                                                     subpart DDDD.
                                                     Enclosures that
                                                     meet the design
                                                     criteria (1)
                                                     through (4) in the
                                                     definition of wood
                                                     products enclosure,
                                                     or that meet Method
                                                     204 requirements
                                                     for a PTE (except
                                                     for the criteria
                                                     specified in
                                                     section 6.2 of
                                                     Method 204) are
                                                     assumed to have a
                                                     capture efficiency
                                                     of 100 percent.
                                                     Measured emissions
                                                     divided by the
                                                     capture efficiency
                                                     provides the
                                                     emission rate.
                                                     Fugitive emissions
                                                     are equal to the
                                                     difference in the
                                                     emission rate and
                                                     measured emissions.

(14) each process unit with   establish the site-   data from the
 a HAP control device          specific operating    parameter
 required to be tested         requirements          monitoring system
 according to table 2A to      (including the        or THC CEMS and the
 this appendix.                parameter limits or   applicable
                               THC concentration     performance test
                               limits) in table 2    method(s).
                               to subpart DDDD.
------------------------------------------------------------------------
a Excludes direct-fired process units fired with only natural gas or
  propane.
b Provided that percent R as determined in Annex A5 of ASTM D6348-03 is
  equal or greater than 70 percent and less than or equal to 130
  percent.

                                     Table 3 to Appendix B to Subpart DDDD of 40 CFR Part 63.--Maximum Allowable Toxicity-Weighted Carcinogen Emission Rate
                                                                                [(lb/hr)/([mu]g/m3)]
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                                Distance to property boundary  (m)
          Stack height (m)           -----------------------------------------------------------------------------------------------------------------------------------------------------------
                                           0            50          100          150          200          250          500          1000         1500         2000         3000         5000
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
5...................................     8.72E-07     8.72E-07     8.72E-07     9.63E-07     1.25E-06     1.51E-06     2.66E-06     4.25E-06     4.39E-06     4.39E-06     4.39E-06     5.00E-06
10..................................     2.47E-06     2.47E-06     2.47E-06     2.47E-06     2.47E-06     2.61E-06     3.58E-06     5.03E-06     5.89E-06     5.89E-06     5.89E-06     6.16E-06
20..................................     5.81E-06     5.81E-06     5.81E-06     5.81E-06     5.81E-06     5.81E-06     5.90E-06     7.39E-06     8.90E-06     9.97E-06     9.97E-06     1.12E-05
30..................................     7.74E-06     7.74E-06     7.74E-06     7.74E-06     7.74E-06     7.74E-06     8.28E-06     9.49E-06     1.17E-05     1.35E-05     1.55E-05     1.61E-05
40..................................     9.20E-06     9.20E-06     9.20E-06     9.20E-06     9.20E-06     9.20E-06     9.24E-06     1.17E-05     1.34E-05     1.51E-05     1.98E-05     2.22E-05
50..................................     1.02E-05     1.02E-05     1.02E-05     1.02E-05     1.02E-05     1.02E-05     1.02E-05     1.36E-05     1.53E-05     1.66E-05     2.37E-05     2.95E-05
60..................................     1.13E-05     1.13E-05     1.13E-05     1.13E-05     1.13E-05     1.13E-05     1.13E-05     1.53E-05     1.76E-05     1.85E-05     2.51E-05     3.45E-05
70..................................     1.23E-05     1.23E-05     1.23E-05     1.23E-05     1.23E-05     1.23E-05     1.23E-05     1.72E-05     2.04E-05     2.06E-05     2.66E-05     4.07E-05
80..................................     1.34E-05     1.34E-05     1.34E-05     1.34E-05     1.34E-05     1.34E-05     1.34E-05     1.92E-05     2.15E-05     2.31E-05     2.82E-05     4.34E-05
100.................................     1.52E-05     1.52E-05     1.52E-05     1.52E-05     1.52E-05     1.52E-05     1.52E-05     1.97E-05     2.40E-05     2.79E-05     3.17E-05     4.49E-05
200.................................     1.76E-05     1.76E-05     1.76E-05     1.76E-05     1.76E-05     1.76E-05     1.76E-05     2.06E-05     2.94E-05     3.24E-05     4.03E-05    5.04E-05
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
MIR=1E-06.

                                    Table 4 to Appendix B to Subpart DDDD of 40 CFR Part 63.--Maximum Allowable Toxicity-Weighted Noncarcinogen Emission Rate
                                                                                [(lb/hr)/([mu]g/m3)]
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                                Distance to property boundary  (m)
          Stack height  (m)          -----------------------------------------------------------------------------------------------------------------------------------------------------------
                                           0            50          100          150          200          250          500          1000         1500         2000         3000         5000
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
5...................................     2.51E-01     2.51E-01     3.16E-01     3.16E-01     3.16E-01     3.16E-01     3.16E-01     3.46E-01     4.66E-01     6.21E-01     9.82E-01     1.80E+00
10..................................     5.62E-01     5.62E-01     5.62E-01     5.62E-01     5.62E-01     5.62E-01     5.62E-01     5.70E-01     6.33E-01     7.71E-01     1.13E+00     1.97E+00
20..................................     1.43E+00     1.43E+00     1.43E+00     1.43E+00     1.43E+00     1.43E+00     1.43E+00     1.43E+00     1.68E+00     1.83E+00     2.26E+00     3.51E+00
30..................................     2.36E+00     2.36E+00     2.36E+00     2.36E+00     2.36E+00     2.36E+00     2.53E+00     3.04E+00     3.04E+00     3.33E+00     4.45E+00     5.81E+00
40..................................     3.11E+00     3.11E+00     3.11E+00     3.11E+00     3.11E+00     3.11E+00     3.42E+00     4.04E+00     5.07E+00     5.51E+00     6.39E+00     9.63E+00
50..................................     3.93E+00     3.93E+00     3.93E+00     3.93E+00     3.93E+00     3.93E+00     4.49E+00     4.92E+00     6.95E+00     7.35E+00     8.99E+00     1.25E+01
60..................................     4.83E+00     4.83E+00     4.83E+00     4.83E+00     4.83E+00     4.83E+00     5.56E+00     6.13E+00     7.80E+00     1.01E+01     1.10E+01     1.63E+01
70..................................     5.77E+00     5.77E+00     5.77E+00     5.77E+00     5.77E+00     5.77E+00     6.45E+00     7.71E+00     8.83E+00     1.18E+01     1.36E+01     1.86E+01
80..................................     6.74E+00     6.74E+00     6.74E+00     6.74E+00     6.74E+00     6.74E+00     7.12E+00     9.50E+00     1.01E+01     1.29E+01     1.72E+01     2.13E+01
100.................................     8.87E+00     8.87E+00     8.87E+00     8.87E+00     8.87E+00     8.87E+00     8.88E+00     1.19E+01     1.37E+01     1.55E+01     2.38E+01     2.89E+01
200.................................     1.70E+01     1.70E+01     1.70E+01     1.70E+01     1.70E+01     1.70E+01     1.70E+01     2.05E+01     2.93E+01     3.06E+01     4.02E+01    4.93E+01
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 HI=1.

0
13. Add appendix C to subpart DDDD to read as follows:

Appendix C to Subpart DDDD of Part 63--Considerations for a Small-Scale
Kiln Emission Testing Program

1.0 Purpose

    Emissions test data from small-scale lumber kilns can be used to
reasonably approximate emissions from full-scale lumber kilns if
representative lumber samples are dried and the venting
characteristics of the small-scale kiln mimic those of the full-
scale kiln. This appendix provides a list of considerations that
must be taken into account by facilities conducting small-scale
lumber kiln emissions testing to approximate emissions from their
full-scale lumber kilns for purposes of the low-risk demonstration
described under appendix B to subpart DDDD of part 63.
    The considerations described in this appendix apply only for
small-scale lumber kiln emissions testing conducted to provide data
for the low-risk demonstration described under appendix B to subpart
DDDD of part 63. Permitting authorities may require different
procedures for testing or estimating lumber kiln emissions for
purposes other than the low-risk demonstration described under
appendix B to subpart DDDD of part 63.

2.0 Considerations for Lumber Samples

    2.1 A written plan must be developed for obtaining
representative lumber samples to use as charges at the small-scale
kilns. The plan must discuss how the samples are selected and
handled and the basis upon which they are considered to be
representative. If possible, information on the harvest site, date
harvested, segregation from other lumber (if segregated), and
processing at the sawmill must be included. If this information is
unavailable, a general description of the sawmill's wood procurement
and processing practices must be provided. The affected source and
testing laboratory must approve the written test plan before
beginning the small-scale kiln testing.
    2.2 Samples must not be subject to significant air drying during
processing, shipping, or storage prior to charging into the small-
scale kiln.
    2.3 Enough lumber must be collected to provide for extra lumber
charges in case of testing failures.
    2.4 Information on the lumber used for each small-scale kiln
charge must be reported including the items in paragraphs 2.4.1
though 2.4.4 of this section:
    2.4.1 Total kiln charge, board feet,
    2.4.2 Nominal dimensions of lumber dried (for example, 2x4s),
    2.4.3 Moisture content (dry basis) of the green lumber, and
    2.4.4 Moisture content (dry basis) of the kiln dried lumber.

3.0 Considerations for Kiln Operating Parameters

    The small-scale kiln must operate in a similar manner to the
full-scale kilns for items 3.1 through 3.3 of this section. The
small-scale kiln must operate in a reasonably consistent manner from
charge-to-charge for all items (3.1 through 3.5) listed in this
section.
    3.1 Air velocity through the kiln charge.
    3.2 Temperature profiles or kiln schedules (wet-bulb/dry-bulb
temperatures throughout the kiln cycle).
    3.3 Ending moisture content (dry basis) of the lumber (may need
to be mathematically adjusted for small-scale kilns).
    3.4 Kiln venting profile (trend) for the sample event/kiln cycle
(normalized to a board foot or thousand board feet).
    3.5 Mass emission rate profile (trend) for the sample event/kiln
cycle.

4.0 Considerations for Emission Sampling

    4.1 Sample equipment must be able to sample gases with high
moisture content.
    4.2 You must accurately measure/calculate total kiln exhaust and
exhaust moisture content. If direct measurements are impractical
other methods used must be explicitly discussed in the report.
    4.3 You must accurately measure the concentration of the
compounds of concern either in the kiln exhaust or at a proper
location within the kiln.

5.0 Considerations for Sample Intervals and Sampling Runs

    5.1 A minimum of two full kiln cycles or batches must be tested
to determine the emissions for a particular wood species or for a
facility utilizing only one wood species.
    5.2 You may use a single kiln cycle for emission values for wood
species that require more than 3 days to dry.
    5.3 Since kiln drying cycles typically exceed 20 hours, it is
suggested that sampling be conducted in intervals throughout the
drying cycle. Three hours provide a reasonable sample interval
(sample run), but sampling equipment or manpower may dictate other
schedules. Sampling equipment ``turnaround'' will result in gaps in
the kiln emission data. The gaps must not exceed 45% of the kiln
cycle. Data for the gaps occurring at certain periods of time in the
drying cycle can be calculated by linear interpolation from the
sampling values on either side of the gap. Other techniques may be
required if the data gap occurs when the measured data exhibit high
levels of variability. As a minimum, sampling intervals must include
initial hours of the kiln operating cycle once the kiln has warmed
to target wet bulb and/or dry bulb temperatures and begins venting,
hours of kiln operation during the middle of the kiln drying cycle,
and hours of kiln operation towards the end of the kiln drying
cycle.
    5.4 The final production-based mass emission rate for the small-
scale kiln sample event is determined by integrating the area under
the mass emission rate profile curve.

6.0 Considerations for Reporting

    The emissions report must contain the information in paragraphs
6.1 through 6.9 of this section.
    6.1 Graphical, charge-by-charge results for items 3.2, 3.4, and
3.5 above and numerical data for items 3.1 and 3.3. Describe how the
full-scale kiln operates in comparison to the small-scale kiln in
order to show that the full-scale kiln drying cycle was reasonably
reproduced in the small-scale kiln.
    6.2 A moisture balance by comparing the water loss (from the
green versus dry lumber charge weight difference) to the water
exhausted from the kiln (using the exhaust flow rate and moisture
content of the exhaust).
    6.3 A description of the sampling system and sampling
methodology.
    6.4 A summary and background data for all quality assurance
measures required by the sampling methods.
    6.5 Discussion of method detection limits and treatment of
values below the detection limit.
    6.6 An example of emission rate calculations.
    6.7 Explanation or reference to the methodology used to
calculate emissions to the target or desired ending lumber moisture
content.
    6.8 Information outlined in section 2.0 of this appendix,
including a discussion of collection and handling of lumber samples.
    6.9 Data and show calculations for developed emission factors.

7.0 Guidance

    7.1 NCASI Technical Bulletin 845 provides a large amount of
detail that can be of assistance in many phases of a small-scale
kiln testing program. This report should be viewed as ``one way,''
not ``the only way'' to conduct testing.
    7.2 Oregon State University, Mississippi State University, the
University of Idaho, and others have published information regarding
operation and testing of small-scale kilns. These publications are a
very good source of information on small-scale kilns.
[FR Doc. 06-1071 Filed 2-15-06; 8:45 am]

BILLING CODE 6560-50-P