Air Toxics Notebook
Reinforced Plastics Composite Manufacturing -  Subpart WWWW

Applicability: eCFR Subpart WWWW []

This subpart applies to:
  1. Reinforced plastic composites production facilities at Major Sources* of HAPs that use thermoset resins or gel coats containing styrene.
  2. Any associated cleaning, mixing, HAP-containing materials storage, or repair operations.
Not subject to this subpart:
  1. Facilities used only for repair. This includes the non-routine manufacture of individual parts or components intended to repair larger items.
  2. Research and development facilities as defined in section 112 (c)(7) of the Clean Air Act.
  3. Facilities that use less than 1.2 tons per year combined of resins and gel coats containing styrene.
  4. Sources subject to NESHAP VVVV.
*Major Sources emit or have the potential to emit:
  • > 10 tons per year of a single HAP, or
  • > 25 tons per year combined HAPs.
  • Area Sources emit less than Major Sources.
Rules apply to small, area sources? No
Known Sources in NDEQ Jurisdiction:

Facility ID

A-1 Fiberglass

Date of Original Final Rule: 4/21/03
Amendments Dates: 08/25/2005 - Direct Final Rule; Amendments
04/21/2003 - Final Rule
State Regulations (Title 129): Title 129,Chapter 28, Section 001.68. Sources are also responsible for ensuring they are in compliance with current federal requirements found for this subpart in the CFR.
Federal Regulations: 40 CFR 63.5780
Related Rules:

NESHAP – 40 CFR Part 63

Subpart SS - Closed Vent Systems/Control Devices
Subpart VVVV - Boat Manufacturing
Subpart PPPP - Plastic Parts and Products (surface coating)
Subpart MMMM - Misc Metal Parts and Products (surface coating)
Regulations and Federal Registers:
eCFR Subpart WWWW []

(See attached file: 4W - Fed. Reg. 2005-08-25 - Final Rule.pdf)

(See attached file: 4W - Fed. Reg. 2003-04-21 - Final Rule.pdf)

(See attached file: 4W - Fed. Reg. 2001-08-02 - Proposed Rule.pdf)

SizeFile Name
367 KB 4W - Fed. Reg. 2005-08-25 - Final Rule.pdf
4,234 KB 4W - Fed. Reg. 2003-04-21 - Final Rule.pdf
277 KB 4W - Fed. Reg. 2001-08-02 - Proposed Rule.pdf
Forms: NDEQ Notification Form

(See attached file: 4W - Initial Notification Form.pdf)(See attached file: 4W - Initial Notification Form.docx)

SizeFile Name
126 KB 4W - Initial Notification Form.pdf
28 KB 4W - Initial Notification Form.docx
Important Dates: Source Classification
  1. Existing Source = constructed or reconstructed on or before Aug 2, 2001
  2. New Source = constructed or reconstructed after Aug 2, 2001, with no prior reinforced plastic composite manufacturing on-site
Initial Notification
  1. Existing source = Must notify by Aug 19, 2003
  2. New source = Must notify by Aug 19, 2003 or within 120 days of startup, whichever is later.
Compliance Dates
  1. Existing source
    • If Major Source on or before subpart publication date = Must comply by April 21, 2006
    • If it becomes a Major Source after the subpart publication date = must comply within 3 years of becoming a Major Source
  2. New source
    • If Major Source upon startup = Must comply by April 21, 2003 or upon startup, whichever is later
    • If it becomes a Major Source after startup = Immediately upon becoming a Major Source
  3. Centrifugal & continuous lamination/casting that exceeds 100 tons per year = must comply within 3 years following semiannual report
Compliance Status Notification
  1. If using organic HAP Averaging
    • No later than 1 year + 30 days from compliance date
  2. If using Organic HAP Content limits, application equipment requirements or emissions limits (other than averaging)
    • No later than 30 days from compliance date
  3. If using add on control
    • No later than 60 days after test
    • Must also submit a Notice of Intent to test 60 days in advance
Compliance Reports
  1. Semiannual Reports
    • One for each reporting period of January 1 to June 30 or July 1 to December 31
    • Due July 31 or January 31, respectively
    • Can be submitted with Certification of Compliance & Deviation Reports
  2. Startup, Shutdown, & Malfunction (SSM)
    • Must be submitted for any SSM not consistent with your SSM plan
    • Notification must be given by fax or phone within 2 working days
    • Written notification must be given 7 working days

FAQs, Fact Sheets, and Rule Summaries: (See attached file: 4W - CFA Guide.pdf)

(See attached file: 4W - EPA Applic. Chart 2004.pdf)

(See attached file: 4W - EPA FAQ 05-2006.pdf)

EPA's Subpart WWWW Website [] - contains federal register notices and more implementation tools

SizeFile Name
297 KB 4W - CFA Guide.pdf
114 KB 4W - EPA Applic. Chart 2004.pdf
49 KB 4W - EPA FAQ 05-2006.pdf
Presentations, Training and Articles: (See attached file: 4W - EPA Training 12-2006.pdf)

SizeFile Name
81 KB 4W - EPA Training 12-2006.pdf
Other Information and Resources: (See attached file: 4W - NDEQ Inspection checklist 2001.pdf)

(See attached file: 4W - EPA example calculations 12-2005.pdf)

SizeFile Name
40 KB 4W - NDEQ Inspection checklist 2001.pdf
82 KB 4W - EPA example calculations 12-2005.pdf
Page Last Updated: 6/27/18