1 May 4, 2004 Sacramento Thermal Spraying ATCM Public Workshop

2 Introductions ARB’s Toxics Program Thermal Spraying Project –Background –Project Goals –Completed & Ongoing Activities –Regulatory Concepts –Schedule Agenda Thermal Spraying Public Workshop - May 2004

3  Identification of Toxic Air Contaminants  Airborne Toxic Control Measures  Air Toxics “Hot Spots” (AB2588)  Neighborhood Air Monitoring  Risk Reduction Guidelines ARB’s Toxics Program Thermal Spraying Public Workshop - May 2004

4 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 Public Workshop - May 2004

5 ARB’s Thermal Spraying Project Thermal Spraying Public Workshop - May 2004 Spray Gun Feed Material Oxygen & Fuel Gas or Electric Arc Molten Metal Background :

6 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 Public Workshop - May 2004

7 Control Devices : Most common is dry filter cartridge Others include: HEPA Filter, Water Curtain, Wet Scrubber, and Baghouse Control Efficiency ratings can be assigned, based on standardized tests:  HEPA Filter um  Dry Filter um ARB’s Thermal Spraying Project Thermal Spraying Public Workshop - May 2004

8 Project Goals: Characterize thermal spray industry Quantify toxic air emissions Determine extent of health risks Implement risk reduction measures ARB’s Thermal Spraying Project Thermal Spraying Public Workshop - May 2004

9 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 Public Workshop - May 2004

10 Completed Activities 2003 Survey of Thermal Spraying Material Manufacturers 2004 Survey of Thermal Spraying Facilities Air Dispersion Modeling ARB’s Thermal Spraying Project Thermal Spraying Public Workshop - May 2004

11 Key Findings from Surveys: 103 tons of thermal spraying materials sold in CA in 2002 Materials contained 18 tons of chromium and 34 tons of nickel The aerospace industry uses more than 1/3 of the materials CA has 47 active thermal spraying facilities Most facilities have control devices More than 1/2 of facilities use chromium-containing materials ARB’s Thermal Spraying Project Thermal Spraying Public Workshop - May 2004

12 Key Findings from Surveys: ARB’s Thermal Spraying Project Thermal Spraying Public Workshop - May Total Active Facilities = 30 Permitted 17 Unpermitted 41 Have Control Devices 64 % 36 % 87 % 16 Have HEPA Filters34 % 24 Use Products w/Chromium51 %

13 Ongoing Activities Statewide Emission Inventory Health Risk Assessment Cost Analysis Initial Statement of Reasons Draft Regulatory Language ARB’s Thermal Spraying Project Thermal Spraying Public Workshop - May 2004

14 Emission Estimates Working with districts to develop emission estimation methodology Based on stack tests, scientific research, and industry data ARB’s Thermal Spraying Project Thermal Spraying Public Workshop - May 2004

15 Current Requirements Air Permits Toxics New Source Review AB 2588 ARB’s Thermal Spraying Project Thermal Spraying Public Workshop - May 2004

16 Regulatory Concepts New Facilities um Existing Facilities - Control efficiency requirements would vary, depending on health risk & cost Permitting & Recordkeeping ARB’s Thermal Spraying Project Thermal Spraying Public Workshop - May 2004

17 Regulatory Concepts Existing Facilities - Point Sources: ARB’s Thermal Spraying Project Thermal Spraying Public Workshop - May %Low Threshold 0.5 umMedium Threshold Required Control Efficiency Annual Toxic Emissions (lbs/yr) 0.3 umHigh Threshold

18 Regulatory Concepts Existing Facilities - Volume Sources: ARB’s Thermal Spraying Project Thermal Spraying Public Workshop - May %Low Threshold 0.5 umMedium Threshold Required Control Efficiency Annual Toxic Emissions (lbs/yr) 0.3 umHigh Threshold

19 Regulatory Concepts New Facilities: Required Control Efficiency: 0.3 um All Facilities: Permitting & Recordkeeping Future Compliance Date ARB’s Thermal Spraying Project Thermal Spraying Public Workshop - May 2004

20 Summary Thermal spraying generates toxic air emissions. ARB is working on an ATCM regulation to control toxic emissions & protect public health. The ATCM would be based on the use of BACT in consideration of health risk and cost. ARB’s Thermal Spraying Project Thermal Spraying Public Workshop - May 2004

21 Schedule June 23 2nd Public Workshop September Proposed Regulation and Staff Report Available - Public has 45 days to comment October 21Tentative Board Hearing Date ARB’s Thermal Spraying Project Thermal Spraying Public Workshop - May 2004

22 Public Involvement Website: Sign up for List Server to get updates Attend Workshops (can be done by phone) Provide Comments Meet with ARB Attend Board Hearing (can participate via internet) ARB’s Thermal Spraying Project Thermal Spraying Public Workshop - May 2004

23 Monique Spears Davis, P.E. (916) Jose Gomez, Manager (916) ARB Stationary Source Division Measures Assessment Branch 1001 I Street, P.O. Box 2815 Sacramento, CA ARB Points of Contact Thermal Spraying Public Workshop - May 2004

24 QUESTIONS? Thermal Spraying Public Workshop - May 2004