§ 63.2291 40 CFR Ch. I (7–1–12 Edition)

§ 63.2291 Who implements and en- ess units associated with the manufac- forces this subpart? turing of and composite (a) This subpart can be implemented products. The affected source includes, and enforced by the U.S. EPA or a dele- but is not limited to, green end oper- gated authority such as your State, ations, refining, drying operations (in- local, or tribal agency. If the EPA Ad- cluding any combustion unit exhaust ministrator has delegated authority to stream routinely used to direct fire your State, local, or tribal agency, process unit(s)), resin preparation, then that agency has the authority to blending and forming operations, press- implement and enforce this subpart. ing and board cooling operations, and You should contact your EPA Regional miscellaneous finishing operations Office to find out if this subpart is dele- (such as sanding, sawing, patching, gated to your State, local, or tribal edge sealing, and other finishing oper- agency. ations not subject to other NESHAP). (b) In delegating implementation and The affected source also includes on- enforcement authority of this subpart site storage of raw materials used in to a State, local, or tribal agency the manufacture of plywood and/or under 40 CFR part 63, subpart E, the composite wood products, such as res- authorities contained in paragraph (c) ins; onsite wastewater treatment oper- of this section are retained by the EPA ations specifically associated with ply- Administrator and are not transferred wood and composite wood products to the State, local, or tribal agency. manufacturing; and miscellaneous (c) The authorities that will not be coating operations (defined elsewhere delegated to State, local, or tribal in this section). The affected source in- agencies are listed in paragraphs (c)(1) cludes kilns at PCWP manufac- through (4) of this section. turing facilities and at any other kind (1) Approval of alternatives to the of facility. compliance options, operating require- Agricultural fiber means the fiber of ments, and work practice requirements an annual agricultural crop. Examples in §§ 63.2240 and 63.2241 as specified in of agricultural fibers include, but are § 63.6(g). For the purposes of delegation not limited to, wheat straw, rice straw, authority under 40 CFR part 63, sub- and bagasse. part E, ‘‘compliance options’’ represent Biofilter means an enclosed control ‘‘emission limits’’; ‘‘operating require- system such as a tank or series of ments’’ represent ‘‘operating limits’’; tanks with a fixed roof that contact and ‘‘work practice requirements’’ rep- emissions with a solid media (such as resent ‘‘work practice standards.’’ bark) and use microbiological activity (2) Approval of major alternatives to to transform organic pollutants in a test methods as specified in process exhaust stream to innocuous § 63.7(e)(2)(ii) and (f) and as defined in compounds such as carbon dioxide, § 63.90. water, and inorganic salts. Wastewater (3) Approval of major alternatives to treatment systems such as aeration la- monitoring as specified in § 63.8(f) and goons or activated sludge systems are as defined in § 63.90. not considered to be biofilters. (4) Approval of major alternatives to Capture device means a hood, enclo- recordkeeping and reporting as speci- sure, or other means of collecting fied in § 63.10(f) and as defined in § 63.90. emissions into a duct so that the emis- [69 FR 46011, July 30, 2004, as amended at 72 sions can be measured. FR 61063, Oct. 29, 2007] Capture efficiency means the fraction (expressed as a percentage) of the pol- § 63.2292 What definitions apply to this lutants from an emission source that subpart? are collected by a capture device. Terms used in this subpart are de- Catalytic oxidizer means a control sys- fined in the Clean Air Act (CAA), in 40 tem that combusts or oxidizes, in the CFR 63.2, the General Provisions, and presence of a catalyst, exhaust gas in this section as follows: from a process unit. Catalytic oxidizers Affected source means the collection include regenerative catalytic of dryers, refiners, blenders, formers, oxidizers and thermal catalytic presses, board coolers, and other proc- oxidizers.

240

VerDate Mar<15>2010 08:07 Aug 24, 2012 Jkt 226158 PO 00000 Frm 00250 Fmt 8010 Sfmt 8010 Y:\SGML\226158.XXX 226158 erowe on DSK2VPTVN1PROD with Environmental Protection Agency § 63.2292

Combustion unit means a dryer burn- Direct-fired process unit means a proc- er, process heater, or boiler. Combus- ess unit that is heated by the passing tion units may be used for combustion of combustion exhaust through the of organic HAP emissions. process unit such that the process ma- Control device means any equipment terial is contacted by the combustion that reduces the quantity of HAP emit- exhaust. ted to the air. The device may destroy Dryer heated zones means the zones of the HAP or secure the HAP for subse- a veneer dryer or fiberboard quent recovery. Control devices in- mat dryer that are equipped with heat- clude, but are not limited to, thermal ing and hot air circulation units. The or catalytic oxidizers, combustion cooling zone(s) of the dryer through units that incinerate process exhausts, which ambient air is blown are not biofilters, and condensers. part of the dryer heated zones. Control system or add-on control system Dry forming means the process of means the combination of capture and making a mat of resinated fiber to be control devices used to reduce HAP compressed into a reconstituted wood emissions to the atmosphere. product such as particleboard, oriented Conveyor strand dryer means a con- strandboard, medium density fiber- veyor dryer used to reduce the mois- board, or . ture of wood strands used in the manu- Dry rotary dryer means a rotary dryer that dries wood particles or fibers with facture of oriented strandboard, lami- a maximum inlet moisture content of nated strand lumber, or other wood less than or equal to 30 percent (by strand-based products. A conveyor weight, dry basis) and operates with a strand dryer is a process unit. maximum inlet temperature of less Conveyor strand dryer zone means than or equal to 600 °F. A dry rotary each portion of a conveyor strand dryer dryer is a process unit. with a separate heat exchange system product means a and exhaust vent(s). Conveyor strand product made with lumber, veneers, dryers contain multiple zones (e.g., strands of wood, or from other small three zones), which may be divided into wood elements that are bound together multiple sections. with resin. Engineered wood products Deviation means any instance in include, but are not limited to, lami- which an affected source subject to this nated strand lumber, laminated veneer subpart, or an owner or operator of lumber, parallel strand lumber, wood I- such a source: joists, and glue-laminated beams. (1) Fails to meet any requirement or Fiber means the discrete elements of obligation established by this subpart wood or similar cellulosic material, including, but not limited to, any com- which are separated by mechanical pliance option, operating requirement, means, as in refining, that can be or work practice requirement; formed into boards. (2) Fails to meet any term or condi- Fiberboard means a composite panel tion that is adopted to implement an composed of cellulosic fibers (usually applicable requirement in this subpart, wood or agricultural material) made by and that is included in the operating wet forming and compacting a mat of permit for any affected source required fibers. Fiberboard density generally is to obtain such a permit; or less than 0.50 grams per cubic centi- (3) Fails to meet any compliance op- meter (31.5 pounds per cubic foot). tion, operating requirement, or work Fiberboard mat dryer means a dryer practice requirement in this subpart used to reduce the moisture of wet- during startup, shutdown, or malfunc- formed wood fiber mats by applying tion, regardless of whether or not such heat. A fiberboard mat dryer is a process failure is permitted by this subpart. A unit. deviation is not always a violation. Flame zone means the portion of the The determination of whether a devi- combustion chamber in a combustion ation constitutes a violation of the unit that is occupied by the flame en- standard is up to the discretion of the velope. entity responsible for enforcement of Furnish means the fibers, particles, the standards. or strands used for making boards.

241

VerDate Mar<15>2010 08:07 Aug 24, 2012 Jkt 226158 PO 00000 Frm 00251 Fmt 8010 Sfmt 8010 Y:\SGML\226158.XXX 226158 erowe on DSK2VPTVN1PROD with § 63.2292 40 CFR Ch. I (7–1–12 Edition)

Glue-laminated beam means a struc- Kiln-dried lumber means solid wood tural wood beam made by bonding lum- lumber that has been dried in a lumber ber together along its faces with resin. kiln. Green rotary dryer means a rotary Laminated strand lumber (LSL) means dryer that dries wood particles or fi- a composite product formed into a bil- bers with an inlet moisture content of let made of thin wood strands cut from greater than 30 percent (by weight, dry whole logs, resinated, and pressed to- basis) at any dryer inlet temperature gether with the grain of each strand or operates with an inlet temperature oriented parallel to the length of the ° of greater than 600 F with any inlet finished product. moisture content. A green rotary dryer Laminated veneer lumber (LVL) means is a process unit. a composite product formed into a bil- Group 1 miscellaneous coating oper- let made from layers of resinated wood ations means application of edge seals, veneer sheets or pieces pressed to- lines, logo (or other information) , shelving edge fillers, trademark/ gether with the grain of each veneer gradestamp inks, and wood putty aligned primarily along the length of patches to plywood and composite the finished product. Laminated veneer wood products (except kiln-dried lum- lumber is also known as parallel strand ber) on the same site where the ply- lumber (PSL). wood and composite wood products are Lumber means boards or planks sawed manufactured. Group 1 miscellaneous or split from logs or timber, including coating operations also include appli- logs or timber processed for use as util- cation of synthetic patches to plywood ity poles or other wood components. at new affected sources. Lumber can be either green (non-dried) Hardboard means a composite panel or dried. Lumber is typically either composed of inter-felted cellulosic fi- air-dried or kiln-dried. bers made by dry or wet forming and Lumber kiln means an enclosed dryer pressing of a resinated fiber mat. Hard- operated by applying heat to reduce board generally has a density of 0.50 the moisture content of lumber. grams per cubic centimeter (31.5 Medium density fiberboard (MDF) pounds per cubic foot) or greater. means a composite panel composed of Hardboard oven means an oven used cellulosic fibers (usually wood or agri- to heat treat or temper hardboard after cultural fiber) made by dry forming hot pressing. Humidification chambers and pressing of a resinated fiber mat. are not considered as part of hardboard Method detection limit means the min- ovens. A hardboard oven is a process imum concentration of an analyte that unit. can be determined with 99 percent con- means the wood of a broad- fidence that the true value is greater leafed tree, either deciduous or ever- than zero. green. Examples of include, but are not limited to, , , Miscellaneous coating operations poplar, and . means application of any of the fol- Hardwood veneer dryer means a dryer lowing to plywood or composite wood that removes excess moisture from ve- products: edge seals, moisture sealants, neer by conveying the veneer through a anti-skid coatings, company logos, heated medium on rollers, belts, ca- trademark or grade stamps, nail lines, bles, or wire mesh. Hardwood veneer synthetic patches, wood patches, wood dryers are used to dry veneer with less putty, concrete forming oils, glues for than 30 percent softwood species on an veneer composing, and shelving edge annual volume basis. Veneer kilns that fillers. Miscellaneous coating oper- operate as batch units, veneer dryers ations also include the application of heated by radio frequency or micro- primer to oriented strandboard siding waves that are used to redry veneer, that occurs at the same site as ori- and veneer redryers (defined elsewhere ented strandboard manufacture and ap- in this section) that are heated by con- plication of asphalt, clay slurry, or ti- ventional means are not considered to tanium dioxide coatings to fiberboard be hardwood veneer dryers. A hardwood at the same site of fiberboard manufac- veneer dryer is a process unit. ture.

242

VerDate Mar<15>2010 08:07 Aug 24, 2012 Jkt 226158 PO 00000 Frm 00252 Fmt 8010 Sfmt 8010 Y:\SGML\226158.XXX 226158 erowe on DSK2VPTVN1PROD with Environmental Protection Agency § 63.2292

Molded particleboard means a shaped fiber) generally in the form of discrete composite product (other than a com- pieces or particles, as distinguished posite panel) composed primarily of from fibers, which are pressed together cellulosic materials (usually wood or with resin. agricultural fiber) generally in the Plywood means a panel product con- form of discrete pieces or particles, as sisting of layers of wood veneers hot distinguished from fibers, which are pressed together with resin. Plywood pressed together with resin. includes panel products made by hot MSF means thousand feet (92.9 pressing (with resin) veneers to a sub- square meters). Square footage of pan- strate such as particleboard, medium els is usually measured on a thickness density fiberboard, or lumber. Plywood basis, such as 3⁄8-inch, to define the products may be flat or curved. total volume of panels. Equation 6 of Plywood and composite wood products § 63.2262(j) shows how to convert from (PCWP) manufacturing facility means a one thickness basis to another. facility that manufactures plywood Nondetect data means, for the pur- and/or composite wood products by poses of this subpart, any value that is bonding wood material (fibers, par- below the method detection limit. ticles, strands, veneers, etc.) or agri- Non-HAP coating means a coating cultural fiber, generally with resin with HAP contents below 0.1 percent by under heat and pressure, to form a mass for Occupational Safety and panel, engineered wood product, or Health Administration-defined carcino- other product defined in § 63.2292. Ply- gens as specified in 29 CFR wood and composite wood products 1910.1200(d)(4), and below 1.0 percent by manufacturing facilities also include mass for other HAP compounds. facilities that manufacture dry veneer 1-hour period means a 60-minute pe- and lumber kilns located at any facil- riod. ity. Plywood and composite wood prod- Oriented strandboard (OSB) means a ucts include, but are not limited to, composite panel produced from thin plywood, veneer, particleboard, molded wood strands cut from whole logs, particleboard, oriented strandboard, formed into resinated layers (with the hardboard, fiberboard, medium density grain of strands in one layer oriented fiberboard, laminated strand lumber, perpendicular to the strands in adja- laminated veneer lumber, wood I- cent layers), and pressed. joists, kiln-dried lumber, and glue-lam- Oven-dried ton(s) (ODT) means tons of inated beams. wood dried until all of the moisture in Press predryer means a dryer used to the wood is removed. One oven-dried reduce the moisture and elevate the ton equals 907 oven-dried kilograms. temperature by applying heat to a wet- Parallel strand lumber (PSL) means a formed fiber mat before the mat enters composite product formed into a billet a hot press. A press predryer is a process made from layers of resinated wood ve- unit. neer sheets or pieces pressed together Pressurized refiner means a piece of with the grain of each veneer aligned equipment operated under pressure for primarily along the length of the fin- preheating (usually by steaming) wood ished product. Parallel strand lumber is material and refining (rubbing or also known as laminated veneer lumber grinding) the wood material into fibers. (LVL). Pressurized refiners are operated with Partial wood products enclosure means continuous infeed and outfeed of wood an enclosure that does not meet the de- material and maintain elevated inter- sign criteria for a wood products enclo- nal pressures (i.e., there is no pressure sure as defined in this subpart. release) throughout the preheating and Particle means a discrete, small piece refining process. A pressurized refiner is of cellulosic material (usually wood or a process unit. agricultural fiber) produced mechani- Primary tube dryer means a single- cally and used as the aggregate for a stage tube dryer or the first stage of a particleboard. multi-stage tube dryer. Tube dryer Particleboard means a composite stages are separated by vents for re- panel composed primarily of cellulosic moval of moist gases between stages materials (usually wood or agricultural (e.g., a product cyclone at the end of a

243

VerDate Mar<15>2010 08:07 Aug 24, 2012 Jkt 226158 PO 00000 Frm 00253 Fmt 8010 Sfmt 8010 Y:\SGML\226158.XXX 226158 erowe on DSK2VPTVN1PROD with § 63.2292 40 CFR Ch. I (7–1–12 Edition)

single-stage dryer or between the first Resin means the synthetic adhesive and second stages of a multi-stage tube (including glue) or natural binder, in- dryer). The first stage of a multi-stage cluding additives, used to bond wood or tube dryer is used to remove the major- other cellulosic materials together to ity of the moisture from the wood fur- produce plywood and composite wood nish (compared to the moisture reduc- products. tion in subsequent stages of the tube Responsible official means responsible dryer). Blow-lines used to apply resin official as defined in 40 CFR 70.2 and 40 are considered part of the primary tube CFR 71.2. dryer. A primary tube dryer is a process Rotary strand dryer means a rotary unit. dryer operated by applying heat and Process unit means equipment classi- used to reduce the moisture of wood fied according to its function such as a strands used in the manufacture of ori- blender, dryer, press, former, or board ented strandboard, laminated strand cooler. lumber, or other wood strand-based Reconstituted wood product board cool- products. A rotary strand dryer is a er means a piece of equipment designed process unit. to reduce the temperature of a board Secondary tube dryer means the sec- by means of forced air or convection ond stage and subsequent stages fol- within a controlled time period after lowing the primary stage of a multi- the board exits the reconstituted wood stage tube dryer. Secondary tube dry- product press unloader. Board coolers ers, also referred to as relay dryers, op- erate at lower temperatures than the include wicket and star type coolers primary tube dryer they follow. Sec- commonly found at medium density fi- ondary tube dryers are used to remove berboard and particleboard plants. only a small amount of the furnish Board coolers do not include cooling moisture compared to the furnish sections of dryers (e.g., veneer dryers moisture reduction across the primary or fiberboard mat dryers) or coolers in- tube dryer. A secondary tube dryer is a tegrated into or following hardboard process unit. bake ovens or humidifiers. A reconsti- Softwood means the wood of a conif- tuted wood product board cooler is a erous tree. Examples of in- process unit. clude, but are not limited to, Southern Reconstituted wood product press yellow , Douglas , and White means a press, including (if applicable) . the press unloader, that presses a Softwood veneer dryer means a dryer resinated mat of wood fibers, particles, that removes excess moisture from ve- or strands between hot platens or hot neer by conveying the veneer through a rollers to compact and set the mat into heated medium, generally on rollers, a panel by simultaneous application of belts, cables, or wire mesh. Softwood heat and pressure. Reconstituted wood veneer dryers are used to dry veneer product presses are used in the manu- with greater than or equal to 30 per- facture of hardboard, medium density cent softwood species on an annual vol- fiberboard, particleboard, and oriented ume basis. Veneer kilns that operate as strandboard. Extruders are not consid- batch units, veneer dryers heated by ered to be reconstituted wood product radio frequency or microwaves that are presses. A reconstituted wood product used to redry veneer, and veneer re- press is a process unit. dryers (defined elsewhere in this sec- Representative operating conditions tion) that are heated by conventional means operation of a process unit dur- means are not considered to be ing performance testing under the con- softwood veneer dryers. A softwood ve- ditions that the process unit will typi- neer dryer is a process unit. cally be operating in the future, includ- Startup means bringing equipment ing use of a representative range of ma- online and starting the production terials (e.g., wood material of a typical process. species mix and moisture content or Startup, initial means the first time typical resin formulation) and rep- equipment is put into operation. Initial resentative operating temperature startup does not include operation range. solely for testing equipment. Initial

244

VerDate Mar<15>2010 08:07 Aug 24, 2012 Jkt 226158 PO 00000 Frm 00254 Fmt 8010 Sfmt 8010 Y:\SGML\226158.XXX 226158 erowe on DSK2VPTVN1PROD with Environmental Protection Agency § 63.2292

startup does not include subsequent that has been previously dried. Because startups (as defined in this section) fol- the veneer dried in a veneer redryer lowing malfunction or shutdowns or has been previously dried, the inlet following changes in product or be- moisture content of the veneer enter- tween batch operations. Initial startup ing the redryer is less than 25 percent does not include startup of equipment (by weight, dry basis). Batch units used that occurred when the source was an to redry veneer (such as redry cookers) area source. are not considered to be veneer re- Startup, shutdown, and malfunction dryers. A veneer redryer is a process plan (SSMP) means a plan developed unit. according to the provisions of Wet control device means any equip- § 63.6(e)(3). ment that uses water as a means of col- Strand means a long (with respect to lecting an air pollutant. Wet control thickness and width), flat wood piece devices include scrubbers, wet electro- specially cut from a log for use in ori- static precipitators, and electrified fil- ented strandboard, laminated strand ter beds. Wet control devices do not in- lumber, or other wood strand-based clude biofilters or other equipment product. that destroys or degrades HAP. Temporary total enclosure (TTE) means Wet forming means the process of an enclosure constructed for the pur- making a slurry of water, fiber, and ad- pose of measuring the capture effi- ditives into a mat of fibers to be com- ciency of pollutants emitted from a pressed into a fiberboard or hardboard given source, as defined in Method 204 product. of 40 CFR part 51, appendix M. Wood I-joists means a structural wood Thermal oxidizer means a control sys- beam with an I-shaped cross section tem that combusts or oxidizes exhaust formed by bonding (with resin) wood or gas from a process unit. Thermal laminated veneer lumber flanges onto oxidizers include regenerative thermal a web cut from a panel such as plywood oxidizers and combustion units. or oriented strandboard. Total hazardous air pollutant emissions Wood products enclosure means a per- means, for purposes of this subpart, the manently installed containment that sum of the emissions of the following was designed to meet the following six compounds: acetaldehyde, acrolein, physical design criteria: formaldehyde, methanol, phenol, and (1) Any natural draft opening shall be propionaldehyde. at least four equivalent opening diame- Tube dryer means a single-stage or ters from each HAP-emitting point, ex- multi-stage dryer operated by applying cept for where board enters and exits heat to reduce the moisture of wood fi- the enclosure, unless otherwise speci- bers or particles as they are conveyed fied by the EPA Administrator. (usually pneumatically) through the (2) The total area of all natural draft dryer. Resin may or may not be applied openings shall not exceed 5 percent of to the wood material before it enters the surface area of the enclosure’s four the tube dryer. Tube dryers do not in- walls, floor, and ceiling. clude pneumatic fiber transport sys- (3) The average facial velocity of air tems that use temperature and humid- through all natural draft openings ity conditioned pneumatic system sup- shall be at least 3,600 meters per hour ply air in order to prevent cooling of (200 feet per minute). The direction of the wood fiber as it is moved through airflow through all natural draft open- the process. A tube dryer is a process ings shall be into the enclosure. unit. (4) All access doors and windows Veneer means thin sheets of wood whose areas are not included in item 2 peeled or sliced from logs for use in the of this definition and are not included manufacture of wood products such as in the calculation of facial velocity in plywood, laminated veneer lumber, or item 3 of this definition shall be closed other products. during routine operation of the proc- Veneer redryer means a dryer heated ess. by conventional means, such as direct (5) The enclosure is designed and wood-fired, direct-gas-fired, or steam maintained to capture all emissions for heated, that is used to redry veneer discharge through a control device.

245

VerDate Mar<15>2010 08:07 Aug 24, 2012 Jkt 226158 PO 00000 Frm 00255 Fmt 8010 Sfmt 8010 Y:\SGML\226158.XXX 226158 erowe on DSK2VPTVN1PROD with Pt. 63, Subpt. DDDD, Table 1A 40 CFR Ch. I (7–1–12 Edition)

Work practice requirement means any thereof, that is promulgated pursuant design, equipment, work practice, or to section 112(h) of the CAA. operational standard, or combination [69 FR 46011, July 30, 2004, as amended at 71 FR 8372, Feb. 16, 2006]

TABLE 1A TO SUBPART DDDD OF PART 63—PRODUCTION-BASED COMPLIANCE OPTIONS

You must meet the fol- lowing production-based For the following process units . . . compliance option (total HAP a basis) . . .

(1) Fiberboard mat dryer heated zones (at new affected sources only) ...... 0.022 lb/MSF 1⁄2″. (2) Green rotary dryers ...... 0.058 lb/ODT. (3) Hardboard ovens ...... 0.022 lb/MSF 1⁄8″. (4) Press predryers (at new affected sources only) ...... 0.037 lb/MSF 1⁄2″. (5) Pressurized refiners ...... 0.039 lb/ODT. (6) Primary tube dryers ...... 0.26 lb/ODT. (7) Reconstituted wood product board coolers (at new affected sources only) ...... 0.014 lb/MSF 3⁄4″. (8) Reconstituted wood product presses ...... 0.30 lb/MSF 3⁄4″. (9) Softwood veneer dryer heated zones ...... 0.022 lb/MSF 3⁄8″. (10) Rotary strand dryers ...... 0.18 lb/ODT. (11) Secondary tube dryers ...... 0.010 lb/ODT.

a Total HAP, as defined in § 63.2292, includes acetaldehyde, acrolein, formaldehyde, methanol, phenol, and propionaldehyde. lb/ODT = pounds per oven-dried ton; lb/MSF = pounds per thousand square feet with a specified thickness basis (inches). Sec- tion 63.2262(j) shows how to convert from one thickness basis to another. NOTE: There is no production-based compliance option for conveyor strand dryers.

TABLE 1B TO SUBPART DDDD OF PART 63—ADD-ON CONTROL SYSTEMS COMPLIANCE OPTIONS

You must comply with one of the following six compliance op- For each of the following process units . . . tions by using an emissions control system . . .

Fiberboard mat dryer heated zones (at new affected sources (1) Reduce emissions of total HAP, measured as THC (as car- only); green rotary dryers; hardboard ovens; press predryers bon) a, by 90 percent; or (at new affected sources only); pressurized refiners; primary (2) Limit emissions of total HAP, measured as THC (as car- tube dryers; secondary tube dryers; reconstituted wood prod- bon) a, to 20 ppmvd; or uct board coolers (at new affected sources only); reconsti- (3) Reduce methanol emissions by 90 percent; or tuted wood product presses; softwood veneer dryer heated (4) Limit methanol emissions to less than or equal to 1 ppmvd zones; rotary strand dryers; conveyor strand dryer zone one if uncontrolled methanol emissions entering the control de- (at existing affected sources); and conveyor strand dryer vice are greater than or equal to 10 ppmvd; or zones one and two (at new affected sources). (5) Reduce formaldehyde emissions by 90 percent; or (6) Limit formaldehyde emissions to less than or equal to 1 ppmvd if uncontrolled formaldehyde emissions entering the control device are greater than or equal to 10 ppmvd.

a You may choose to subtract methane from THC as carbon measurements.

TABLE 2 TO SUBPART DDDD OF PART 63—OPERATING REQUIREMENTS

If you operate a(n) . . . You must . . . Or you must . . .

(1) Thermal oxidizer ...... Maintain the 3-hour block average fire- Maintain the 3-hour block average THC box temperature above the minimum concentration a in the thermal oxidizer temperature established during the exhaust below the maximum con- performance test. centration established during the per- formance test. (2) Catalytic oxidizer ...... Maintain the 3-hour block average cata- Maintain the 3-hour block average THC lytic oxidizer temperature above the concentration a in the catalytic oxidizer minimum temperature established dur- exhaust below the maximum con- ing the performance test; AND check centration established during the per- the activity level of a representative formance test. sample of the catalyst at least every 12 months. (3) Biofilter ...... Maintain the 24-hour block biofilter bed Maintain the 24-hour block average THC temperature within the range estab- concentration a in the biofilter exhaust lished according to § 63.2262(m). below the maximum concentration es- tablished during the performance test.

246

VerDate Mar<15>2010 08:07 Aug 24, 2012 Jkt 226158 PO 00000 Frm 00256 Fmt 8010 Sfmt 8002 Y:\SGML\226158.XXX 226158 erowe on DSK2VPTVN1PROD with