1. 1 June 23, 2004 Sacramento Thermal Spraying ATCM Second Public Workshop

2. 2 Introductions Project Description Thermal Spraying ATCM Development –1st Public Workshop Recap –Background –Completed & Ongoing Activities –Draft Regulatory Language –Emission Estimates –Schedule Agenda Thermal Spraying 2nd Public Workshop - June 2004

3. 3 Project Description ARB is developing an Airborne Toxic Control Measure (ATCM) for Thermal Spraying ATCM would apply to thermal spraying processes that use chromium or nickel ATCM would protect public health by specifying control efficiencies, based on emission levels and health risk ARB’s Thermal Spraying Project Thermal Spraying 2nd Public Workshop - June 2004

4. 4 ARB’s Thermal Spraying Project Why ? Board request Potential use as replacement for hard chromium electroplating Hexavalent chromium is very toxic Nickel can cause cancer & other health effects Community Health/Environmental Justice Thermal Spraying 2nd Public Workshop - June 2004

5. 5  1st Public Workshop on May 4, 2004  ARB’s Air Toxics Program  Thermal Spraying project background  Key findings from surveys  General regulatory concepts 1st Public Workshop Thermal Spraying 2nd Public Workshop - June 2004

6. 6 Background : What is thermal spraying? Metals are sprayed onto a surface in a molten (or nearly molten) condition to form a coating. Includes: - Flame Spraying - Plasma Spraying - Twin-Wire Electric Arc - HVOF - Detonation Gun ARB’s Thermal Spraying Project Thermal Spraying 2nd Public Workshop - June 2004

7. 7 ARB’s Thermal Spraying Project Thermal Spraying 2nd Public Workshop - June 2004 Feed Material Oxygen & Fuel Gas or Electric Arc Molten Metal Background :

8. 8 Materials may contain chromium, nickel, and other toxic air contaminants Can generate air emissions of hexavalent chromium & nickel Used in a wide variety of industries, particularly aerospace ARB’s Thermal Spraying Project Thermal Spraying 2nd Public Workshop - June 2004

9. 9 Control Devices : - Dry Filter Cartridge - HEPA Filter- Water Curtain - Wet Scrubber- Baghouse Control Efficiency ratings can be assigned, based on standardized tests:  HEPA Filter - 99.97% @ 0.3 um  Dry Filter - 99.999% @ 0.5 um ARB’s Thermal Spraying Project Thermal Spraying 2nd Public Workshop - June 2004

10. 10 Completed Activities Two Thermal Spraying Surveys  2003 - Material Manufacturers  2004 - Thermal Spraying Facilities Air Dispersion Modeling Draft Regulatory Language Draft Emissions Methodology ARB’s Thermal Spraying Project Thermal Spraying 2nd Public Workshop - June 2004

11. 11 Key Findings from Surveys: ARB’s Thermal Spraying Project Thermal Spraying 2nd Public Workshop - June 2004 48 Total Active Facilities = 27 Permitted 21 Unpermitted 42 Have Control Devices 56 % 44 % 88 % 16 Have HEPA Filters33 % 24 Use Products w/Chromium50 %

12. 12 Ongoing Activities Statewide Emission Inventory Health Risk Assessment Cost Analysis Initial Statement of Reasons ARB’s Thermal Spraying Project Thermal Spraying 2nd Public Workshop - June 2004

13. 13 Current Requirements Air Permits Toxics New Source Review AB 2588 Air Toxics Hot Spots ARB’s Thermal Spraying Project Thermal Spraying 2nd Public Workshop - June 2004

14. 14 Draft Regulatory Language New and Modified Facilities - 99.97% @ 0.3 um Existing Facilities - Control efficiency requirements would vary, depending on health risk & cost Permitting & Recordkeeping ARB’s Thermal Spraying Project Thermal Spraying 2nd Public Workshop - June 2004

15. 15 Draft Regulatory Language Existing Facilities - POINT Sources: ARB’s Thermal Spraying Project Thermal Spraying 2nd Public Workshop - June 2004 90%> 0.004 and < 0.04 99.999% @ 0.5 um > 2.4 and < 23.6 Minimum Required Control Efficiency Annual Emissions (lbs/yr)* 99.97% @ 0.3 um Tier 1 2 3 Hex. ChromeNickel > 0.04 and < 0.4> 23.6 and < 236 > 0.4> 236 * These are controlled emissions, if a control device exists.

16. 16 Draft Regulatory Language Existing Facilities - VOLUME Sources: ARB’s Thermal Spraying Project Thermal Spraying 2nd Public Workshop - June 2004 90%> 0.001 and < 0.01 99.999% @ 0.5 um > 0.5 and < 5.1 Minimum Required Control Efficiency Annual Emissions (lbs/yr) 99.97% @ 0.3 um Tier 1 2 3 Hex. ChromeNickel > 0.01 and < 0.1> 5.1 and < 51 > 0.1> 51 * These are controlled emissions, if a control device exists.

17. 17 Draft Regulatory Language New and Modified Facilities: Installed or Modified after July 1, 2005 Required Control Efficiency: 99.97% @ 0.3 um All Facilities: Permitting & Recordkeeping Future Compliance Dates Nickel - Hourly Emissions ARB’s Thermal Spraying Project Thermal Spraying 2nd Public Workshop - June 2004

18. 18 Emission Estimates Worked with districts to develop emission estimation methodology Based on stack tests, scientific research, and industry data Available for public review ARB’s Thermal Spraying Project Thermal Spraying 2nd Public Workshop - June 2004

19. 19 Schedule August Third Public Workshop October22 Proposed Regulation and Staff Report Available - Public has 45 days to comment December 9 Tentative Board Hearing Date ARB’s Thermal Spraying Project Thermal Spraying 2nd Public Workshop - June 2004

20. 20 Public Involvement Website: http://www.arb.ca.gov/coatings/thermal/thermal.htm Sign up for List Server to get updates Provide Comments Meet with ARB Attend Board Hearing (can participate via internet) ARB’s Thermal Spraying Project Thermal Spraying 2nd Public Workshop - June 2004

21. 21 Monique Spears Davis, P.E. mdavis@arb.ca.gov (916) 324-8182 Jose Gomez, Manager jgomez@arb.ca.gov (916) 324-8033 ARB Stationary Source Division Measures Assessment Branch 1001 I Street, P.O. Box 2815 Sacramento, CA 95812 ARB Points of Contact Thermal Spraying 2nd Public Workshop - June 2004

22. 22 QUESTIONS? Thermal Spraying 2nd Public Workshop - June 2004