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For the reasons stated in the preamble, title 40, chapter I, 

part 63 of the Code of Federal Regulations is amended as 

follows: 

PART 63--[AMENDED] 

 1. The authority citation for part 63 continues to read as 

follows: 

Authority: 42 U.S.C. 7401 et seq. 

 2. Part 63 is amended by adding subpart WWWWWW to read as 

follows: 

Subpart WWWWWW—-National Emission Standards for Hazardous Air 

Pollutants: Area Source Standards for Plating and Polishing 

Operations 

Sec. 

Applicability and Compliance Dates 

63.11504 Am I subject to this subpart? 

63.11505 What parts of my plant does this subpart cover? 

63.11506 What are my compliance dates? 

Standards and Compliance Requirements 

63.11507 What are my standards and management practices? 

63.11508 What are my compliance requirements? 

63.11509 What are my notification, reporting, and recordkeeping 

requirements? 

Other Requirements and Information 

63.11510 What General Provisions apply to this subpart? 

63.11511 What definitions apply to this subpart? 

63.11512 Who implements and enforces this subpart? 

63.11513 [Reserved] 

Tables to Subpart WWWWWW of Part 63 
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Table 1 to Subpart WWWWWW of Part 63—-Applicability of General 

Provisions to Plating and Polishing Area Sources 

Subpart WWWWWW—-National Emission Standards for Hazardous Air 

Pollutants: Area Source Standards for Plating and Polishing 

Operations 

Applicability and Compliance Dates 

§63.11504 Am I subject to this subpart? 

 (a) You are subject to this subpart if you own or operate 

a plating and polishing facility that is an area source of 

hazardous air pollutant (HAP) emissions and meets the criteria 

specified in paragraphs (a)(1) through (3) of this section. 

 (1) A plating and polishing facility is a plant site that 

is engaged in one or more of the processes listed in paragraphs 

(a)(1)(i) through (vi) of this section. 

 (i) Electroplating other than chromium electroplating 

(i.e., non-chromium electroplating). 

 (ii) Electroless or non-electrolytic plating. 

 (iii) Other non-electrolytic metal coating processes, such 

as chromate conversion coating, nickel acetate sealing, sodium

dichromate sealing, and manganese phosphate coating; and thermal 

spraying. 

 (iv) Dry mechanical polishing of finished metals and 

formed products after plating or thermal spraying. 

 (v) Electroforming. 
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 (vi) Electropolishing. 

 (2) A plating or polishing facility is aAn area source of 

HAP emissions, where an area source is any stationary source or 

group of stationary sources within a contiguous area under 

common control that does not have the potential to emit any 

single HAP at a rate of 9.07 megagrams per year (Mg/yr) (10 tons 

per year (tpy)) or more and any combination of HAP at a rate of 

22.68 Mg/yr (25 tpy) or more. 

 (3) Your plating and polishing facility uses or has 

emissions of compounds of one or more plating and polishing 

metal HAP, which means any compound of any of the following 

metals: cadmium, chromium, lead, manganese, and nickel, as 

defined in §63.11511, “What definitions apply to this subpart?” 

With the exception of lead, plating and polishing metal HAP also 

include any of these metals in the elemental form. 

 (b) [Reserved] 

§63.11505 What parts of my plant does this subpart cover? 

 (a) This subpart applies to each new or existing affected 

source, as specified in paragraphs (a)(1) through (3) of this 

section, at all times. A new source is defined in §63.11511, 

“What definitions apply to this subpart?” 

 (1) Each tank that contains one or more of the plating and 

polishing metal HAP, as defined in §63.11511, “What definitions 

apply to this subpart?", and is used for non-chromium 
4 of 49 

electroplating; electroforming; electropolishing; electroless 

plating or other non-electrolytic metal coating operations, such 

as chromate conversion coating, nickel acetate sealing, sodium

dichromate sealing, and manganese phosphate coating. 

 (2) Each thermal spraying operation that applies one or 

more of the plating and polishing metal HAP, as defined in 

§63.11511, “What definitions apply to this subpart?” 

 (3) Each dry mechanical polishing operation that emits one 

or more of the plating and polishing metal HAP, as defined in 

§63.11511, “What definitions apply to this subpart?” 

 (b) An affected source is existing if you commenced 

construction or reconstruction of the affected source on or 

before March 14, 2008. 

 (c) An affected source is new if you commenced 

construction or reconstruction of the affected source after 

March 14, 2008. 

(d) This subpart does not apply to any of the process 

units or operations described in paragraphs (d)(1) through (6) 

of this section. 

 (1) Process units that are subject to the requirements of 

40 CFR part 63, subpart N (National Emission Standards for 

Chromium Emissions from Hard and Decorative Chromium 

Electroplating and Chromium Anodizing Tanks). 

 (2) Research and development process units, as defined in 
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§63.11511, “What definitions apply to this subpart?” 

 (3) Process units that are used strictly for educational 

purposes. 

 (4) Plating, polishing, coating, or tThermal spraying 

conducted to repair surfaces or equipment. 

 (5) Dry mechanical polishing conducted to restore the 

original finish to a surface to apply to restoring the original 

finish. 

 (6) Any plating or polishing process that does not uses

any process materials that contains cadmium, chromium, lead, or 

nickel (as the metal) in amounts less than of 0.1 percent or 

more by weight, or that contains manganese in amounts of less 

than 1.0 percent or more by weight (as the metal), as used. 

Information used to determine the amount of plating and 

polishing metal HAP in materials used in the plating or 

polishing process may include information as reported on the 

Material Safety Data Sheet for the material, but is not 

required. For plating or polishing tanks, the HAP content may 

be determined from the final bath contents “as used” to plate or 

to polish.

 (e) You are exempt from the obligation to obtain a permit 

under 40 CFR part 70 or 40 CFR part 71, “Title V,” provided you 

are not otherwise required to obtain a permit under 40 CFR 

70.3(a) or 40 CFR 71.3(a) for a reason other than your status as 
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an area source under this subpart. Notwithstanding the previous 

sentence, you must continue to comply with the provisions of 

this subpart applicable to area sources. 

§63.11506 What are my compliance dates? 

 (a) If you own or operate an existing affected source, you 

must achieve compliance with the applicable provisions of this 

subpart no later than July 1, 2010.

 (b) If you own or operate a new affected source for which 

the initial startup date is on or before July 1, 2008, you must 

achieve compliance with the provisions of this subpart no later 

than July 1, 2008. 

 (c) If you own or operate a new affected source for which 

the initial startup date is after July 1, 2008, you must achieve 

compliance with the provisions of this subpart upon initial 

startup of your affected source.

Standards and Compliance Requirements

§63.11507 What are my standards and management practices? 

 (a) If you own or operate an affected new or existing noncyanide electroplating, electroforming, or electropolishing tank 

(hereafter referred to as an “electrolytic” process tank, as 

defined in §63.11511, “What definitions apply to this subpart?") 

that contains one or more of the plating and polishing metal HAP 

and operates at a pH of less than 12, you must comply with the 

requirements in paragraph (a)(1), (2), or (3) of this section, 
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and implement the applicable management practices in paragraph 

(g) of this section, as practicable. 

 (1) You must use a wetting agent/fume suppressant, as 

defined in §63.11511, “What definitions apply to this subpart?",

in the bath of the affected tank, as defined in §63.11511, “What 

definitions apply to this subpart?", and according to paragraphs 

(a)(1)(i) through (iii) of this section. 

 (i) You must initially add the wetting agent/fume 

suppressant in the amounts recommended by the manufacturer for 

the specific type of electrolytic process. 

 (ii) You must add wetting agent/fume suppressant in 

proportion to the other bath chemistry ingredients that are 

added to replenish the tank bath, as in the original make-up of 

the bathtank, or in proportions such that the bath contents are 

returned to that of the original make-up of the bath. 

 (iii) If a wetting agent/fume suppressant is included in 

the electrolytic process bath chemicals used in the affected 

tank according to the manufacturer’s instructions, it is not 

necessary to add additional wetting agent/fume suppressants to 

the tank to comply with this rule. 

 (2) You must capture and exhaust emissions from the 

affected tank to any one of the following emission control 

devices: composite mesh pad, packed bed scrubber, or mesh pad 

mist eliminator, according to paragraphs (a)(2)(i) and (ii) of 
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this section. 

 (i) You must operate all capture and control devices 

according to the manufacturer’s specifications and operating 

instructions. 

 (ii) You must keep the manufacturer’s specifications and 

operating instructions at the facility at all times in a 

location where they can be easily accessed by the operators. 

 (3) You must cover the tank surface according to paragraph 

(a)(3)(i) or (ii) of this section. 

 (i) For batch electrolytic process tanks, as defined in 

§63.11511, “What definitions apply to this subpart?”, you must 

use a tank cover, as defined in §63.11511, over all of the 

effective surface area of the tank for at least 95 percent of 

the electrolytic process operating time. 

 (ii) For continuous electrolytic process tanks, as defined 

in §63.11511, “What definitions apply to this subpart?”, you 

must cover at least 75 percent of the surface of the tank, as 

defined in §63.11511, whenever the electrolytic process tank is 

in operation. 

 (b) If you own or operate an affected new or existing 

“flash” or short-term electroplating tank, as defined in 

§63.11511, “What definitions apply to this subpart?”, that uses 

or emits one or more of the plating and polishing metal HAP, you 

must comply with the requirements specified in paragraph (b)(1) 
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or (b)(2), and implement the applicable management practices in 

paragraph (g) of this section, as practicable. 

 (1) You must limit short-term or "flash" electroplating to 

no more than 1 cumulative hour per day or 3 cumulative minutes 

per hour of plating time. 

 (2) You must use a tank cover, as defined in §63.11511 

“What definitions apply to this subpart?”, for at least 95 

percent of the plating time. 

(c) If you own or operate an affected new or existing 

process tank that is used both for short-term electroplating and 

for electrolytic processing of longer duration (i.e., processing 

that does not meet the definition of short-term or flash 

electroplating) and contains one or more of the plating and 

polishing metal HAP, you must meet the requirements specified in 

paragraph (a) or (b) of this section, whichever apply to the 

process operation, and implement the applicable management 

practices in paragraph (g) of this section, as practicable. 

(d) If you own or operate an affected new or existing 

electroplating tank that uses cyanide in the plating bath, 

operates at pH greater than or equal to 12, and contains one or 

more of the plating and polishing metal HAP, you must comply 

with the requirements in paragraph (d)(1) and (2) of this 

section: 

(1) You must measure and record the pH of the tank bath
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upon start-up of the bath, as defined in §63.11511, “What 

definitions apply to this subpart? No additional pH 

measurements are required. 

(2) You must implement the applicable management practices 

in paragraph (g) of this section, as practicable. 

 (e) If you own or operate an affected new or existing dry 

mechanical polishing machine equipment that emits one or more of 

the plating and polishing metal HAP, you must operate a capture 

system that captures particulate matter (PM) emissions from the 

dry mechanical polishing process and transports the emissions to 

a cartridge, fabric, or high efficiency particulate air (HEPA) 

filter, according to paragraphs (e)(1) and (2) of this section. 

 (1) You must operate all capture and control devices 

according to the manufacturer’s specifications and operating 

instructions. 

 (2) You must keep the manufacturer’s specifications and 

operating instructions at the facility at all times in a 

location where they can be easily accessed by the operators. 

 (f) If you own or operate an affected thermal spraying 

operation that applies one or more of the plating and polishing 

metal HAP, you must meet the applicable requirements specified 

in paragraphs (f)(1) through (3) of this section, and the 

applicable management practices in paragraph (g) of this 

section. 
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 (1) For existing permanent thermal spraying operations, 

you must operate a capture system that collects PM emissions 

from the thermal spraying process and transports the emissions 

to a water curtain, fabric filter, cartridge, or HEPA filter, 

according to paragraphs (f)(1)(i) and (ii) of this section. 

 (i) You must operate all capture and control devices 

according to the manufacturer’s specifications and instructions. 

 (ii) You must keep the manufacturer’s operating 

instructions at the facility at all times in a location where 

they can be easily accessed by the operators. 

 (2) For new permanent thermal spraying operations, you 

must operate a capture system that collects PM emissions from 

the thermal spraying process and transports the emissions to a 

fabric, cartridge, or HEPA filter, according to paragraphs 

(f)(2)(i) and (ii) of this section. 

 (i) You must operate all capture and control devices 

according to the manufacturer’s specifications and instructions. 

 (ii) You must keep the manufacturer’s operating 

instructions at the facility at all times in a location where 

they can be easily accessed by the operators. 

 (3) For temporary thermal spraying operations, as defined 

in §63.11511 “What definitions apply to this subpart?”, you must 

meet the applicable requirements specified in paragraphs (f)(3) 

(i) and (ii) of this section. 
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 (i) You must document that the amount of time the thermal 

spraying occurs each day, and where it is conducted. 

 (ii) You must implement the applicable management 

practices specified in paragraph (g) of this section, as 

practicable. 

 (g) If you own or operate an affected new or existing 

plating and polishing process unit that contains, applies, or 

emits one or more of the plating and polishing metal HAP, you 

must implement the applicable management practices in paragraphs 

(g)(1) through (12) of this section, as practicable. 

 (1) Minimize bath agitation when removing any parts 

processed in the tank, as practicable except when necessary to 

meet part quality requirements. 

 (2) Maximize the draining of bath solution back into the 

tank, as practicable, by extending drip time when removing parts 

from the tank; using drain boards (also known as drip shields); 

or withdrawing parts slowly from the tank, as practicable. 

 (3) Optimize the design of barrels, racks, and parts to 

minimize dragout of bath solution (such as by using slotted 

barrels and tilted racks, or by designing parts with flowthrough holes to allow the tank solution to drip back into the 

tank), as practicable. 

 (4) Use tank covers, if already owned and available at the 

facility, whenever practicable. 
13 of 49 

 (5) Minimize or reduce heating of process tanks, as 

practicable (e.g., when doing so would not interrupt production 

or adversely affect part quality). 

 (6) Perform regular repair, maintenance, and preventive 

maintenance of racks, barrels, and other equipment associated 

with affected sources, as practicable. 

 (7) Minimize bath contamination, such as through the 

prevention or quick recovery of dropped parts, use of 

distilled/de-ionized water, water filtration, pre-cleaning of 

parts to be plated, and thorough rinsing of pre-treated parts to 

be plated, as practicable. 

 (8) Maintain quality control of chemicals, and chemical 

and other bath ingredient concentrations in the tanks, as 

practicable. 

 (9) Perform general good housekeeping, such as regular 

sweeping or vacuuming, if needed, and periodic washdowns, as 

practicable. 

 (10) Minimize spills and overflow of tanks, as 

practicable. 

 (11) Use squeegee rolls in continuous or reel-to-reel 

plating tanks, as practicable. 

 (12) Perform regular inspections to identify leaks and 

other opportunities for pollution prevention. 

§63.11508 What are my compliance requirements? 
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 (a) If you own or operate an affected source, you must 

submit a Notification of Compliance Status in accordance with 

§63.11509(b) of “What are my notification, reporting, and 

recordkeeping requirements?” 

 (b) You must be in compliance with the applicable 

management practices and equipment standards in this subpart at 

all times. 

 (c) To demonstrate initial compliance, you must satisfy 

the requirements specified in paragraphs (c)(1) through (11) of 

this section. 

 (1) If you own or operate an affected electroplating, 

electroforming, or electropolishing tank that contains one or 

more of the plating and polishing metal HAP and is subject to 

the requirements in §63.11507(a), “What are my standards and 

management practices?”, and you use a wetting agent/fume 

suppressant to comply with this subpart, you must demonstrate 

initial compliance according to paragraphs (c)(1)(i) through 

(iv) of this section. 

 (i) You must add wetting agent/fume suppressant to the 

bath of each affected tank according to manufacturer's 

specifications and instructions. 

 (ii) You must state in your Notification of Compliance 

Status that you add wetting agent/fume suppressant to the bath 

according to manufacturer's specifications and instructions. 
15 of 49 

 (iii) You must implement the applicable management 

practices specified in §63.11507(g), “What are my standards and 

management practices?”, as practicable. 

 (iv) You must state in your Notification of Compliance 

Status that you have implemented the applicable management 

practices specified in §63.11507(g), “What are my standards and 

management practices?”, as practicable. 

 (2) If you own or operate an affected electroplating, 

electroforming, or electropolishing tank that contains one or 

more of the plating and polishing metal HAP and is subject to 

the requirements in §63.11507(a), “What are my standards and 

management practices?”, and you use a control system, as defined 

in §63.11511, “What definitions apply to this subpart?”, to 

comply with this subpart, you must demonstrate initial 

compliance according to paragraphs (c)(2)(i) through (v) of this 

section. 

 (i) You must install a control system designed to capture 

emissions from the affected tank and exhaust them to a composite 

mesh pad, packed bed scrubber, or mesh pad mist eliminator. 

 (ii) You must state in your Notification of Compliance 

Status that you have installed the control system according to 

the manufacturer's specifications and instructions. 

 (iii) You must implement the applicable management 

practices specified in §63.11507(g), “What are my standards and 
16 of 49 

management practices?”, as practicable. 

 (iv) You must state in your Notification of Compliance 

Status that you have implemented the applicable management 

practices specified in §63.11507(g), “What are my standards and 

management practices?”, as practicable. 

 (v) You must follow the manufacturer’s specifications and 

operating instructions for the control systems at all times. 

 (3) If you own or operate an affected batch electrolytic 

process tank, as defined in §63.11511, “What definitions apply 

to this subpart?”, that contains one or more of the plating and 

polishing metal HAP and which is subject to the requirements in 

§63.11507(a), “What are my standards and management practices?”, 

and you use a tank cover, as defined in §63.11511, to comply 

with § 11507 (a), (b) or (c) of this subpart, you must 

demonstrate initial compliance according to paragraphs (c)(3)(i) 

through (iv) of this section. 

 (i) You must install a tank cover on the affected tank. 

 (ii) You must state in your Notification of Compliance 

Status that you operate the tank with the cover in place at 

least 95 percent of the electrolytic process operating time. 

 (iii) You must implement the applicable management 

practices specified in §63.11507(g), “What are my standards and 

management practices?”, as practicable. 

 (iv) You must state in your Notification of Compliance 
17 of 49 

Status that you have implemented the applicable management 

practices specified in §63.11507(g), “What are my standards and 

management practices?”, as practicable. 

 (4) If you own or operate an affected continuous 

electrolytic process tank, as defined in §63.11511, “What 

definitions apply to this subpart?”, that contains one or more 

of the plating and polishing metal HAP and is subject to the 

requirements in §63.11507(a), “What are my standards and 

management practices?”, and you cover the tank surface to comply 

with § 11507 (a), (b) or (c) of this subpart, you must 

demonstrate initial compliance according to paragraphs (c)(4)(i) 

through (iv) of this section. 

 (i) You must cover at least 75 percent of the surface area 

of the affected tank. 

 (ii) You must state in your Notification of Compliance 

Status that you operate the tank with the surface cover in place 

whenever the continuous electrolytic process is in operation. 

 (iii) You must implement the applicable management 

practices specified in §63.11507(g), “What are my standards and 

management practices?”, as practicable. 

 (iv) You must state in your Notification of Compliance 

Status that you have implemented the applicable management 

practices specified in §63.11507(g), “What are my standards and 

management practices?”, as practicable. 
18 of 49 

 (5) If you own or operate an affected flash or short-term 

electroplating tank that contains one or more of the plating and 

polishing metal HAP and is subject to the requirements in 

§63.11507(b), “What are my standards and management practices?”, 

and you comply with § 11507 (a), (b) or (c) of this subpart by 

limiting the plating time of the affected tank, you must 

demonstrate initial compliance according to paragraphs (c)(5)(i) 

through (iii) of this section. 

 (i) You must state in your Notification of Compliance 

Status that you limit short-term or flash electroplating to no 

more than 1 cumulative hour per day, or 3 cumulative minutes per 

hour of plating time. 

 (ii) You must implement the applicable management 

practices specified in §63.11507(g), “What are my standards and 

management practices?”, as practicable. 

 (iii) You must state in your Notification of Compliance 

Status that you have implemented the applicable management 

practices specified in §63.11507(g), “What are my standards and 

management practices?”, as practicable. 

 (6) If you own or operate an affected flash or short-term 

electroplating tank that contains one or more of the plating and 

polishing metal HAP and is subject to the requirements in 

§63.11507(b), “What are my standards and management practices?”, 

and you comply with § 63.11507 (a), (b) or (c) of this subpart
19 of 49 

by operating the affected tank with a cover, you must 

demonstrate initial compliance according to paragraphs (c)(6)(i) 

through (iv) of this section. 

 (i) You must install a tank cover on the affected tank. 

 (ii) You must state in your Notification of Compliance 

Status that you operate the tank with the cover in place at 

least 95 percent of the plating time. 

 (iii) You must implement the applicable management 

practices specified in §63.11507(g), “What are my standards and 

management practices?”, as practicable. 

 (iv) You must state in your Notification of Compliance 

Status that you have implemented the applicable management 

practices specified in §63.11507(g), “What are my standards and 

management practices?”, as practicable. 

 (7) If you own or operate an affected tank that contains 

one or more of the plating and polishing metal HAP, uses cyanide 

in the bath, and is subject to the management practices 

specified in §63.11507(d), “What are my standards and management 

practices?”, you must demonstrate initial compliance according 

to paragraphs (c)(7)(i) through (iii) of this section. 

 (i) You must report in your Notification of Compliance 

Status the pH of the bath solution that was measured at startup, as defined in § 63.11511, “What definitions apply to this 

subpart?”, according to the requirements of §63.11507(d)(1). 
20 of 49 

 (ii) You must implement the applicable management 

practices specified in §63.11507(g), “What are my standards and 

management practices?”, as practicable. 

 (iii) You must state in your Notification of Compliance 

Status that you have implemented the applicable management 

practices specified in §63.11490(g), “What are my standards and 

management practices?", as practicable. 

 (8) If you own or operate an affected dry mechanical 

polishing operation that emits one or more of the plating and 

polishing metal HAP and is subject to the requirements in 

§63.11507(e), “What are my standards and management practices?”, 

you must demonstrate initial compliance according to paragraphs 

(c)(8)(i) through (iii) of this section. 

 (i) You must install a control system that is designed to 

capture PM emissions from the polishing operation and exhaust 

them to a cartridge, fabric, or HEPA filter. 

 (ii) You must state in your Notification of Compliance 

Status that you have installed the control system according to 

the manufacturer's specifications and instructions. 

 (iii) You must keep the manufacturer’s operating 

instructions at the facility at all times in a location where 

they can be easily accessed by the operators. 

 (9) If you own or operate an existing affected permanent 

thermal spraying operation that applies one or more of the 
21 of 49 

plating and polishing metal HAP and is subject to the 

requirements in §63.11507(f)(1), “What are my standards and 

management practices?”, you must demonstrate initial compliance 

according to paragraphs (c)(9)(i) through (iii) of this section. 

 (i) You must install a control system that is designed to 

capture PM emissions from the thermal spaying operation and 

exhaust them to a water curtain, or a cartridge, fabric, filter

or HEPA filter. 

 (ii) You must state in your Notification of Compliance 

Status that you have installed and are operating the control 

system according to the manufacturer's specifications and 

instructions. 

 (iii) You must keep the manufacturer’s operating 

instructions at the facility at all times in a location where 

they can be easily accessed by the operators. 

 (10) If you own or operate a new affected permanent 

thermal spraying operation that applies one or more of the 

plating and polishing metal HAP and is subject to the 

requirements in §63.11507(f)(2), “What are my standards and 

management practices?”, you must demonstrate initial compliance 

according to paragraphs (c)(10)(i) through (iii) of this 

section. 

 (i) You must install and operate a control system that is 

designed to capture PM emissions from the thermal spaying 
22 of 49 

operation and exhaust them to a cartridge, fabric, or HEPA 

filter. 

 (ii) You must state in your Notification of Compliance 

Status that you have installed and operate the control system 

according to the manufacturer's specifications and instructions. 

 (iii) You must keep the manufacturer’s operating 

instructions at the facility at all times in a location where 

they can be easily accessed by the operators. 

 (11) If you own or operate an affected temporary thermal 

spraying operation that applies one or more of the plating and 

polishing metal HAP and is subject to the requirements in 

§63.11507(f)(3), “What are my standards and management 

practices?”, you must demonstrate initial compliance according 

to paragraphs (c)(11)(i) and (ii) of this section. 

 (i) You must implement the applicable management practices 

specified in §63.11507(g), “What are my standards and management 

practices?”, as practicable. 

 (ii) You must state in your Notification of Compliance 

Status that you have implemented the applicable management 

practices specified in §63.11507(g), “What are my standards and 

management practices?”, as practicable. 

 (d) To demonstrate continuous compliance with the 

applicable management practices and equipment standards 

specified in this subpart, you must satisfy the requirements 
23 of 49 

specified in paragraphs (d)(1) through (8) of this section. 

 (1) You must always operate and maintain your affected 

source, including air pollution control equipment. 

 (2) You must prepare an annual compliance certification 

according the requirements specified in §63.11509(c), 

“Notification, Reporting, and Recordkeeping,” and keep it in a 

readily-accessible location for inspector review. 

 (3) If you own or operate an affected electroplating, 

electroforming, or electropolishing tank that contains one or 

more of the plating and polishing metal HAP and is subject to 

the requirements in §63.11507(a), “What are my standards and 

management practices?”, and you use a wetting agent/fume 

suppressant to comply with this subpart, you must demonstrate 

continuous compliance according to paragraphs (d)(3)(i) through 

(iii) of this section. 

 (i) You must record that you have added the wetting 

agent/fume suppressant to the tank bath in the original make-up 

of the tank. 

 (ii) For tanks where the wetting agent/fume suppressant is 

a separate purchased ingredient from the other tank additives, 

you must demonstrate continuous compliance according to 

paragraphs (d)(3)(ii) (A) and (B) this section. 

 (A) You must add wetting agent/fume suppressant in 

proportion to the other bath chemistry ingredients that are 
24 of 49 

added to replenish the tank bath, as in the original make-up of 

the tank; or in proportion such that the bath is brought back to 

the original make-up of the tank. 

 (B) You must record each addition of wetting agent/fume 

suppressant to the tank bath. 

 (iii) You must state in your annual compliance 

certification that you have added wetting agent/fume suppressant 

to the bath according to the manufacturer's specifications and 

instructions. 

 (4) If you own or operate an affected electroplating, 

electroforming, or electropolishing tank that contains one or 

more of the plating and polishing metal HAP and is subject to 

the requirements in §63.11507(a), “What are my standards and 

management practices?”, and you use a control system to comply 

with this subpart; an affected dry mechanical polishing 

operation that is subject to §63.11507(e); or an affected 

thermal spraying operation that is subject to §63.11507(f)(1) or 

(2), you must demonstrate continuous compliance according to 

paragraphs (d)(4)(i) through (v) of this section. 

 (i) You must operate and maintain the control system 

according to the manufacturer's specifications and instructions. 

 (ii) Following any malfunction or failure of the capture 

or control devices to operate properly, you must take immediate 

corrective action to return the equipment to normal operation 
25 of 49 

according to the manufacturer's specifications and operating 

instructions. 

 (iii) You must state in your annual certification that you 

have operated and maintained the control system according to the 

manufacturer's specifications and instructions. 

 (iv) You must record the results of all control system 

inspections, deviations from proper operation, and any 

corrective action taken. 

 (v) You must keep the manufacturer’s operating 

instructions at the facility at all times in a location where 

they can be easily accessed by the operators. 

 (5) If you own or operate an affected flash or short-term 

electroplating tank that contains one or more of the plating and 

polishing metal HAP and is subject to the requirements in 

§63.11507(b), “What are my standards and management practices?”, 

and you comply with § 63.11507 (a), (b) or (c) of this subpart 

by limiting the plating time for the affected tank, you must 

demonstrate continuous compliance according to paragraphs 

(d)(5)(i) through (iii) of this section. 

 (i) You must limit short-term or flash electroplating to 

no more than 1 cumulative hour per day or 3 cumulative minutes 

per hour of plating time. 

 (ii) You must record the times that the affected tank is 

operated each day. 
26 of 49 

 (iii) You must state in your annual compliance 

certification that you have limited short-term or flash 

electroplating to no more than 1 cumulative hour per day or 3 

cumulative minutes per hour of plating time, whichever is less. 

 (6) If you own or operate an affected batch electrolytic 

process tank that contains one or more of the plating and 

polishing metal HAP and is subject to the requirements of 

§63.11507(a), “What are my standards and management practices?”, 

or a flash or short-term electroplating tank that contains one 

or more of the plating and polishing metal HAP and is subject to 

the requirements in §63.11507(b), and you comply with § 63.11507 

(a), (b) or (c) of this section by operating the affected tank 

with a cover, you must demonstrate continuous compliance 

according to paragraphs (d)(6)(i) through (iii) of this section. 

 (i) You must operate the tank with the cover in place at 

least 95 percent of the electrolytic process operating time. 

 (ii) You must record the times that the tank is operated 

and the times that the tank is covered on a daily basis. 

 (iii) You must state in your annual certification that you 

have operated the tank with the cover in place at least 95 

percent of the electrolytic process time. 

 (7) If you own or operate an affected continuous 

electrolytic process tank that contains one or more of the 

plating and polishing metal HAP and is subject to the 
27 of 49 

requirements in §63.11507(a), “What are my standards and 

management practices?”, and you comply with § 63.11507 (a), (b) 

or (c) of this subpart by operating the affected cover your

tanks with a cover to comply with this subpart, you must 

demonstrate continuous compliance according to paragraphs 

(d)(7)(i) and (ii) of this section. 

 (i) You must operate the tank with at least 75 percent of 

the surface covered during all periods of electrolytic process 

operation. 

 (ii) You must state in your annual certification that you 

have operated the tank with 75 percent of the surface covered 

during all periods of electrolytic process operation. 

 (8) If you own or operate an affected tank or other 

operation that is subject to the management practices specified 

in §63.11507(g), “What are my standards and management 

practices?”, you must demonstrate continuous compliance 

according to paragraphs (d)(8)(i) and (ii) of this section. 

 (i) You must implement the applicable management practices 

during all times that the affected tank or process is in 

operation. 

 (ii) You must state in your annual compliance 

certification that you have implemented the applicable 

management practices, as practicable. 

§63.11509 What are my notification, reporting, and 
28 of 49 

recordkeeping requirements? 

 (a) If you own or operate an affected source, as defined 

in §63.11505(a), “What parts of my plant does this subpart 

cover?”, you must submit an Initial Notification in accordance 

with paragraphs (a)(1) through (4) of this section by the dates 

specified. 

 (1) The Initial Notification must include the information 

specified in §63.9(b)(2)(i) through (iv) of the General 

Provisions of this part. 

 (2) The Initial Notification must include a description of 

the compliance method (e.g., use of wetting agent/fume 

suppressant) for each affected source. 

 (3) If you start up your affected source on or before July 

1, 2008, you must submit an Initial Notification not later than 

120 calendar days after July 1, 2008. 

 (4) If you start up your new affected source after July 1, 

2008, you must submit an Initial Notification not later than 120 

calendar days after when you become subject to this subpart. 

 (b) If you own or operate an affected source, you must 

submit a Notification of Compliance Status in accordance with 

paragraphs (b)(1) and through (23) of this section. 

 (1) The Notification of Compliance Status must be 

submitted before the close of business on the compliance date 

specified in §63.11506, ”What are my compliance dates?” 
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 (2) The Notification of Compliance Status must include the 

items specified in paragraphs (b)(2)(i) through (iv) of this 

section. 

 (i) List of affected sources and the plating and polishing 

metal HAP used in, or emitted by, those sources. 

 (ii) Methods used to comply with the applicable management 

practices and equipment standards. 

 (iii) Description of the capture and emission control 

systems used to comply with the applicable equipment standards. 

 (iv) Statement by the owner or operator of the affected 

source as to whether the source is in compliance with the 

applicable standards or other requirements. 

(3) If a facility makes a change to any items in 

(b)(2)(i), iii, and (iv) of this section that does not result in 

a deviation, an amended Notification of Compliance Status should 

be submitted within 30 days of the change.

 (c) If you own or operate an affected source, you must 

prepare an annual certification of compliance report according 

to paragraphs (c)(1) through (7) of this section. These reports 

do not need to be submitted unless a deviation from the 

requirements of this subpart has occurred during the reporting 

year, in which case, the annual compliance report must be 

submitted along with the deviation report. 

 (1) If you own or operate an affected electroplating, 
30 of 49 

electroforming, or electropolishing tank that is subject to the 

requirements in §63.11507(a)(1), “What are my standards and 

management practices?”, you must state in your annual compliance 

certification that you have added wetting agent/fume suppressant 

to the bath according to the manufacturer's specifications and 

instructions. 

 (2) If you own or operate any one of the affected sources 

listed in paragraphs (c)(2)(i) through (iii) of this section, 

you must state in your annual certification that you have 

operated and maintained the control system according to the 

manufacturer's specifications and instructions. 

 (i) Electroplating, electroforming, or electropolishing 

tank that is subject to the requirements in §63.11507(a), “What 

are my standards and management practices?”, and you use a 

control system to comply with this subpart; 

 (ii) Dry mechanical polishing operation that is subject to 

§63.11507(e); or 

 (iii) Permanent thermal spraying operation that is subject 

to §63.11507(f)(1) or (2). 

 (3) If you own or operate an affected flash or short-term 

electroplating tank that is subject to the requirements in 

§63.11507(b), “What are my standards and management practices?”, 

and you comply with § 63.11507 (a), (b) or (c) of this subpart 

by limiting the plating time of the affected tank, you must 
31 of 49 

state in your annual compliance certification that you have 

limited short-term or flash electroplating to no more than 1 

cumulative hour per day or 3 cumulative minutes per hour of 

plating time. 

 (4) If you own or operate an affected batch electrolytic 

process tank that is subject to the requirements of §63.11507(a) 

or a flash or short-term electroplating tank that is subject to 

the requirements in §63.11507(b), “What are my standards and 

management practices?”, and you comply with § 63.11507 (a), (b) 

or (c) of this subpart by operating the affected tank with a 

cover, you must state in your annual certification that you have 

operated the tank with the cover in place at least 95 percent of 

the electrolytic process time. 

 (5) If you own or operate an affected continuous 

electrolytic process tank that is subject to the requirements of 

§63.11507(a), “What are my standards and management practices?”, 

and you comply with § 63.11507 (a), (b) or (c) of this subpart

by operating the affected tank with a cover, you must state in 

your annual certification that you have covered at least 75 

percent of the surface area of the tank during all periods of 

electrolytic process operation. 

 (6) If you own or operate an affected tank or other 

affected plating and polishing operation that is subject to the 

management practices specified in §63.11507(g), “What are my 
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standards and management practices?”, you must state in your 

annual compliance certification that you have implemented the 

applicable management practices, as practicable. 

 (7) Each annual compliance report must be prepared no 

later than January 31 of the year immediately following the 

reporting period and kept in a readily-accessible location for 

inspector review. If a deviation has occurred during the year, 

each annual compliance report must be submitted along with the 

deviation report, and postmarked or delivered no later than 

January 31 of the year immediately following the reporting 

period. 

 (d) If you own or operate an affected source, and any 

deviations from the compliance requirements specified in this 

subpart occurred during the year, you must report the 

deviations, along with the corrective action taken, and submit 

this report to the delegated authority. 

 (e) You must keep the records specified in paragraphs 

(e)(1) through (3) of this section. 

 (1) A copy of any Initial Notification and Notification of 

Compliance Status that you submitted and all documentation 

supporting those notifications. 

 (2) The records specified in §63.10(b)(2)(i) through (iii) 

and (xiv) of the General Provisions of this part. 

 (3) The records required to show continuous compliance 
33 of 49 

with each management practice and equipment standard that 

applies to you, as specified in §63.11508(d), “What are my 

compliance requirements?” 

 (f) You must keep each record for a minimum of 5 years 

following the date of each occurrence, measurement, maintenance, 

corrective action, report, or record. You must keep each record 

onsite for at least 2 years after the date of each occurrence, 

measurement, maintenance, corrective action, report, or record, 

according to §63.10(b)(1) of the General Provisions to part 63. 

You may keep the records offsite for the remaining 3 years. 

Other Requirements and Information 

§63.11510 What General Provisions apply to this subpart? 

 If you own or operate a new or existing affected source, 

you must comply with the requirements of the General Provisions 

(40 CFR part 63, subpart A) according to Table 1 of this 

subpart. 

§63.11511 What definitions apply to this subpart?

 Terms used in this subpart are defined in this section. 

 Batch electrolytic process tank means a tank used for an 

electrolytic process in which a part or group of parts, 

typically mounted on racks or placed in barrels, is placed in 

the tank and immersed in an electrolytic process solution as a 

single unit (i.e., as a batch) for a predetermined period of 

time, during which none of the parts are removed from the tank 
34 of 49 

and no other parts are added to the tank, and after which the 

part or parts are removed from the tank as a unit. 

 Bath means the liquid contents of a tank, as defined in

this section, that which is used for electroplating, 

electroforming, electropolishing, or other metal coating 

processes at a plating and polishing facility. 

 Bench-scale plating or polishing means any plating or 

polishing operation that is small enough to be performed on a 

bench, table, or similar structure so that the plating or 

polishing tank or equipment is not directly contacting the 

floor.

 Capture system means the collection of components used to 

capture gases and fumes released from one or more emissions 

points and then convey the captured gas stream to a control 

device, as part of a complete control system. A capture system 

may include, but is not limited to, the following components as 

applicable to a given capture system design: duct intake 

devices, hoods, enclosures, ductwork, dampers, manifolds, 

plenums, and fans. 

 Cartridge filter means a type of control device that uses 

perforated metal cartridges containing a pleated paper or nonwoven fibrous filter media to remove PM from a gas stream by 

sieving and other mechanisms. Cartridge filters can be designed 

with single use cartridges, which are removed and disposed after 
35 of 49 

reaching capacity, or continuous use cartridges, which typically 

are cleaned by means of a pulse-jet mechanism. 

 Composite mesh pad means a type of control device similar 

to a mesh pad mist eliminator except that the device is designed 

with multiple pads in series that are woven with layers of 

material with varying fiber diameters, which produce a 

coalescing effect on the droplets or PM that impinge upon the 

pads. 

 Continuous electrolytic process tank means a tank that uses 

an electrolytic process and in which a continuous metal strip or 

other type of continuous substrate is fed into and removed from 

the tank continuously. This process is also called reel-to-reel 

electrolytic plating. 

 Control device means equipment that is part of a control 

system that collects and/or reduces the quantity of a pollutant 

that is emitted to the air. The control device receives 

emissions that are transported from the process by the capture 

system. 

 Control system means the combination of a capture system 

and a control device. The capture system is designed to collect 

and transport air emissions from the affected source to the 

control device. The overall control efficiency of any control 

system is a combination of the ability of the system to capture 

the air emissions (i.e., the capture efficiency) and the control 
36 of 49 

device efficiency. Consequently, it is important to achieve 

good capture to ensure good overall control efficiency. Capture 

devices that are known to provide high capture efficiencies 

include hoods, enclosures, or any other duct intake devices with 

ductwork, dampers, manifolds, plenums, or fans. 

Conversion coatings are coatings that form a hard metal 

finish on an object when the object is submerged in a tank bath

or solution that contains the conversion coatings. Conversion 

coatings for the purposes of this rule include coatings composed 

of chromium, as well as the other plating and polishing metal 

HAP, where no electrical current is used.

 Cyanide plating means plating processes performed in tanks 

that use cyanide as a major bath ingredient and that operate at 

pH of 12 or more, and use or emit any of the plating and 

polishing metal HAP, as defined in this section. Electroplating 

and electroforming are performed with or without cyanide. The 

cyanide in the bath works to dissolve the HAP metal added as a 

cyanide compound (e.g., cadmium cyanide) and creates free 

cyanide in solution, which helps to corrode the anode. These 

tanks are self-regulating to a pH of 12 due to the caustic 

nature of the cyanide bath chemistry. The cyanide in the bath 

is a major bath constituent and not an additive; however, the 

self-regulating chemistry of the bath causes the bath to act as 

if wetting agents/fume suppressants are being used and to ensure 
37 of 49 

an optimum plating process. All cyanide plating baths at pH 

greater than or equal to 12 have cyanide-metal complexes in 

solution. The metal HAP to be plated is not emitted because it 

is either bound in the metal-cyanide complex or reduced at the 

cathode to elemental metal, and plated onto the immersed parts. 

Cyanide baths are not intentionally operated at pH less 12 since 

unfavorable plating conditions would occur in the tank, among 

other negative effects. 

 Deviation means any instance in which an affected source or 

an owner or operator of such an affected source: 

 (1) Fails to meet any requirement or obligation 

established by this rule including, but not limited to, any 

equipment standard (including emissions and operating limits), 

management practice, or operation and maintenance requirement; 

 (2) Fails to meet any term or condition that is adopted to 

implement an applicable requirement in this rule and that is 

included in the operating permit for any affected facility 

required to obtain such a permit; or 

 (3) Fails to meet any equipment standard (including 

emission and operating limits), management standard, or 

operation and maintenance requirement in this rule during 

startup, shutdown, or malfunction. 

 Dry mechanical polishing means a process used for removing 

defects from and smoothing the surface of finished metals and 
38 of 49 

formed products after plating or thermal spraying with any of 

the plating and polishing metal HAP, as defined in this section, 

using automatic or manually-operated machines that have hardfaced abrasive wheels or belts and where no liquids or fluids 

are used to trap the removed metal particles. The affected 

process does not include polishing with use of pastes, liquids, 

lubricants, or any other added materials.

 Electroforming means an electrolytic process using or 

emitting any of the plating and polishing metal HAP, as defined 

in this section, that is used for fabricating metal parts. This 

process is essentially the same as electroplating except that 

the plated substrate (mandrel) is removed, leaving only the 

metal plate. In electroforming, the metal plate is selfsupporting and generally thicker than in electroplating. 

 Electroless plating means a non-electrolytic process that 

uses or emits any of the plating and polishing metal HAP, as 

defined in this section, in which metallic ions in a plating 

bath or solution are reduced to form a metal coating at the 

surface of a catalytic substrate without the use of external 

electrical energy. Electroless plating is also called nonelectrolytic plating. Examples include, but are not limited to, 

chromate conversion coating, nickel acetate sealing, sodium

dichromate sealing, and manganese phosphate coating. 

 Electrolytic plating processes means electroplating and 
39 of 49 

electroforming that use or emit any of the plating and polishing 

metal HAP, as defined in this section, where metallic ions in a 

plating bath or solution are reduced to form a metal coating on 

the surface of parts and products using electrical energy. 

 Electroplating means an electrolytic process that uses or 

emits any of the plating and polishing metal HAP, as defined in 

this section, in which metal ions in solution are reduced onto 

the surface of the work piece (the cathode) via an electrical 

current. The metal ions in the solution are usually replenished 

by the dissolution of metal from solid metal anodes fabricated 

of the same metal being plated, or by direct replenishment of 

the solution with metal salts or oxides; electroplating is also 

called electrolytic plating. 

 Electropolishing means an electrolytic process performed in 

a tank after plating that uses or emits any of the plating and 

polishing metal HAP, as defined in this section, in which a work 

piece is attached to an anode immersed in a bath, and the metal 

substrate is dissolved electrolytically, thereby removing the 

surface contaminant; electropolishing is also called 

electrolytic polishing. For the purposes of this subpart, 

electropolishing does not include bench-scale operations.

 Fabric filter means a type of control device used for 

collecting PM by filtering a process exhaust stream through a 

filter or filter media. A fabric filter is also known as a 
40 of 49 

baghouse. 

 Filters, for the purposes of this rule, include cartridge, 

fabric, or HEPA filters, as defined in this section. 

 Flash electroplating means an electrolytic process 

performed in a tank that uses or emits any of the plating and 

polishing metal HAP, as defined in this section, and that is 

used no more than 3 cumulative minutes per hour or no more than 

1 cumulative hour per day. 

A major facility for HAP is any facility that emits greater 

than 10 tpy of any HAP, or that emits a combined total of all 

HAP of over 25 tpy, where the HAP used to determine the total 

facility emissions are not restricted to only plating and 

polishing metal HAP nor from only plating and polishing 

operations.

 General Provisions of this part (40 CFR part 63, subpart A)

means the section of the Code of Federal Regulations (CFR) that 

addresses air pollution rules that apply to all HAP sources 

addressed in part 63, which includes the NESHAP. 

 HAP means hazardous air pollutant as defined from the list 

of 188 chemicals and compounds specified in the CAA Amendments 

of 1990; HAP are also called “air toxics.” The five plating and 

polishing metal HAP, as defined in this section, are on this 

list of 188 chemicals. 

 High efficiency particulate air (HEPA) filter means a type 
41 of 49 

of control device that uses a filter composed of a mat of 

randomly arranged fibers and is designed to remove at least 

99.97 percent of airborne particles that are 0.3 micrometers or 

larger in diameter. 

Maintenance is any process at a plating and polishing 

facility that is performed to keep the process equipment or the 

facility operating properly and is not performed on items to be 

sold as products.

 Mesh pad mist eliminator means a type of control device, 

consisting of layers of interlocked filaments densely packed 

between two supporting grids that remove liquid droplets and PM 

from the gas stream through inertial impaction and direct 

interception. 

 Metal coating operation means any process performed either 

in a tank that contains liquids or as part of a thermal spraying 

operation, that applies one or more plating and polishing metal 

HAP, as defined in this section, to the surface of parts and 

products used in manufacturing. These processes include but are 

not limited to: non-chromium electroplating; electroforming; 

electropolishing; other non-electrolytic metal coating 

processes, such as chromate conversion coating, electroless 

nickel plating, nickel acetate sealing, sodium dichromate 

sealing, and manganese phosphate coating; and thermal or flame

spraying. 
42 of 49 

 Metal HAP content of material used in plating and polishing 

is the HAP content as determined from an analysis or engineering 

estimate of the HAP contents of the tank bath or solution, in 

the case of plating, metal coating, or electropolishing; or the 

HAP content of the metal coating being applied in the case of 

thermal spraying. Material safety data sheet (MSDS) information 

may be used in lieu of testing or engineering estimates but is 

not required to be used.

 New source means any affected source for which you 

commenced construction or reconstruction after March 14, 2008. 

 Non-cyanide electrolytic plating and electropolishing 

processes means electroplating, electroforming, and 

electropolishing that uses or emits any of the plating and 

polishing metal HAP, as defined in this section, performed 

without cyanide in the tank. These processes do not use cyanide 

in the tank and operate at pH values less than 12. These 

processes use electricity and add or remove metals such as metal 

HAP from parts and products used in manufacturing. Both 

electroplating and electroforming can be performed with cyanide 

as well. 

 Non-electrolytic plating means a process that uses or emits 

any of the plating and polishing metal HAP, as defined in this 

section, in which metallic ions in a plating bath or solution 

are reduced to form a metal coating at the surface of a 
43 of 49 

catalytic substrate without the use of external electrical 

energy. Non-electrolytic plating is also called electroless 

plating. Examples include chromate conversion coating, nickel 

acetate sealing, electroless nickel plating, sodium dichromate 

sealing, and manganese phosphate coating. 

 Packed-bed scrubber means a type of control device that 

includes a single or double packed bed that contains packing 

media on which PM and droplets impinge and are removed from the 

gas stream. The packed-bed section of the scrubber is followed 

by a mist eliminator to remove any water entrained from the 

packed-bed section. 

 Plating and polishing facility means a facility engaged in 

one or more of the following processes that uses or emits any of 

the plating and polishing metal HAP, as defined in this section: 

electroplating processes other than chromium electroplating 

(i.e., non-chromium electroplating); electroless plating; other 

non-electrolytic metal coating processes performed in a tank, 

such as chromate conversion coating, nickel acetate sealing, 

sodium dichromate sealing, and manganese phosphate coating; 

thermal spraying; and the dry mechanical polishing of finished 

metals and formed products after plating or thermal spraying. 

Plating is performed in a tank or thermally sprayed so that a 

metal coating is irreversibly applied to an object. Plating and 

polishing does not include any bench-scale processes.
44 of 49 

 Plating and polishing metal HAP means any compound of any 

of the following metals: cadmium, chromium, lead, manganese, 

and nickel, or any of these metals in the elemental form, with 

the exception of lead. Any material that does not contain 

cadmium, chromium, lead, or nickel in amounts greater than or 

equal to 0.1 percent by weight (as the metal), and does not 

contain manganese in amounts greater than or equal to 1.0 

percent by weight (as the metal), as reported on the Material 

Safety Data Sheet for the material, is not considered to be a 

plating and polishing metal HAP. 

 Plating and polishing process tanks means any tank in which 

a process is performed at an affected plating and polishing 

facility that uses or has the potential to emit any of the 

plating and polishing metal HAP, as defined in this section. 

The processes performed in plating and polishing tanks include 

the following: electroplating processes other than chromium 

electroplating (i.e., non-chromium electroplating) performed in 

a tank; electroless plating; and non-electrolytic metal coating 

processes, such as chromate conversion coating, nickel acetate 

sealing, sodium dichromate sealing, and manganese phosphate 

coating; and electropolishing. This term does not include tanks 

containing solutions that are used to clean, rinse or wash parts 

prior to placing the parts in a plating and polishing process 

tank, or subsequent to removing the parts from a plating and 
45 of 49 

polishing process tank. This term also does not include thermal 

spraying or dry polishing with machines. 

 PM means solid or particulate matter that is emitted into 

the air. 

Repair means any process used to return a finished object 

or tool back to its original function or shape.

 Research and development process unit means any process 

unit that is used for conducting research and development for 

new processes and products and is not used to manufacture 

products for commercial sale, except in a de minimis manner. 

 Short-term plating means an electroplating process that 

uses or emits any of the plating and polishing metal HAP, as 

defined in this section, and that is used no more than 3 

cumulative minutes per hour or 1 hour cumulative per day.

Start-up of the tank bath is when the components or 

relative proportions of the various components in the bath have 

been altered from the most recent operating period. Start-up of 

the bath does not include events where only the tank’s heating 

or agitation and other mechanical operations are turned back on 

after being turned off for a period of time. 

 Tank cover for batch process units means a solid structure 

made of an impervious material that is designed to cover the 

entire open surface of a tank or process unit that is used for 

plating or other metal coating processes. 
46 of 49 

 Tank cover for continuous process units, means a solid 

structure or combination of structures, made of an impervious 

material that is designed to cover at least 75 percent of the 

open surface of the tank or process unit that is used for 

continuous plating or other continuous metal coating processes. 

 Temporary thermal spraying means a thermal spraying 

operation that uses or emits any of the plating and polishing 

metal HAP, as defined in this section, and that lasts no more 

than 1 hour in duration during any one day and is conducted in 

situ. Thermal spraying that is conducted in a dedicated thermal 

spray booth or structure is not considered to be temporary 

thermal spraying. 

 Thermal spraying (also referred to as metal spraying or 

flame spraying) is a process that uses or emits any of the 

plating and polishing metal HAP, as defined in this section, in 

which a metallic coating is applied by projecting heated,

molten, or semi-molten metal particles onto a substrate. 

Commonly-used thermal spraying methods include high velocity 

oxy-fuel (HVOF) spraying, flame spraying, electric arc spraying, 

plasma arc spraying, and detonation gun spraying. This 

operation does not include spray painting at ambient 

temperatures.

 Water curtain means a type of control device that draws the 

exhaust stream through a continuous curtain of moving water to 
47 of 49 

scrub out suspended PM. 

 Wetting agent/fume suppressant means any chemical agent 

that reduces or suppresses fumes or mists from a plating and 

polishing tank by reducing the surface tension of the tank bath. 

§63.11512 Who implements and enforces this subpart?

 (a) This subpart can be implemented and enforced by EPA or 

a delegated authority such as your State, local, or tribal 

agency. If the EPA Administrator has delegated authority to 

your State, local, or tribal agency, then that agency, in 

addition to EPA, has the authority to implement and enforce this 

subpart. You should contact your EPA Regional Office to find 

out if implementation and enforcement of this subpart is 

delegated to your State, local, or tribal agency. 

 (b) In delegating implementation and enforcement authority 

of this subpart to a State, local, or tribal agency under 40 CFR 

part 63, subpart E, the authorities contained in paragraph (c) 

of this section are retained by the EPA Administrator and are 

not transferred to the State, local, or tribal agency. 

 (c) The authorities that cannot be delegated to State, 

local, or tribal agencies are specified in paragraphs (c)(1) 

through (5) of this section. 

 (1) Approval of an alternative non-opacity emissions 

standard under 40 CFR 63.6(g), of the General Provisions of this 

part. 
48 of 49 

 (2) Approval of an alternative opacity emissions standard 

under §63.6(h)(9), of the General Provisions of this part. 

 (3) Approval of a major change to test methods under 

§63.7(e)(2)(ii) and (f), of the General Provisions of this part. 

A “major change to test method” is defined in §63.90. 

 (4) Approval of a major change to monitoring under 

§63.8(f), of the General Provisions of this part. A “major 

change to monitoring” under is defined in §63.90. 

 (5) Approval of a major change to recordkeeping and 

reporting under §63.10(f), of the General Provisions of this 

part. A “major change to recordkeeping/reporting” is defined in 

§63.90. 

§63.11513 [Reserved] 

Tables to Subpart WWWWWW of Part 63 

Table 1 To Subpart WWWWWW of Part 63. Applicability of 

General Provisions to Plating and Polishing Area Sources 

 As required in §63.11510, "What General Provisions apply to 

this subpart?", you must meet each requirement in the following 

table that applies to you. 

Citation Subject

63.11 Applicability.................... 

63.2 Definitions...................... 

63.3 Units and abbreviations.......... 
49 of 49 

Citation Subject

63.4 Prohibited activities............ 

63.6(a), (b)(1)-(b)(5), (c)(1), 

(c)(2), (c)(5), (e)(1), (e)(3), 

(f)(1), (h), and (j) 

Compliance with standards and 

maintenance requirements 

63.10(a), (b)(1), (b)(2)(i)-

(iii),(xiv), (b)(3), (d)(1), 

(f) 

Recordkeeping and reporting...... 

63.12 State authority and delegations.. 

63.13 Addresses of State air pollution 

control agencies and EPA regional 

offices 

63.14 Incorporation by reference....... 

63.15 Availability of information and 

confidentiality 1

 Section 63.11505(e), “What parts of my plant does this subpart cover?”, 

exempts affected sources from the obligation to obtain title V operating 

permits.