ISSUED TO: SITE LOCATION:

FACILITY CONTACT:
MAILING ADDRESS:
SOURCE: April 24, 1996 May 8, 1996 (correction to Order #) KaiserAluminum &Chemical Corporation Trentwood Works 15000 E Euclid Avenue Spokane, Wa Pat Blau (509)927-6350
PO Box 15108 Spokane, Wa 99215-5108 Skim Cooler, RM-20 SecondaryAluminum Production Facility
Kaiser Aluminum & Chemical secondary aluminumproduction Spokane, Wa. Corporation (Kaiser) operates a facility at 15000 E. Euclid Avenue,
Kaiser's skim cooler has the potential to emit about 22 tons of particulate matter (PM) per year as calculated assuming maximum allowable emissions of 0.025 grains per dry standard cubic foot. As partofthe attainmentdemonstration inthe State Implementation Plan (SIP), emissions were modeled, including those from Kaiser's skimcooler. Kaiser's assumedemissions for thismodelingexercise werehigher thanactual emissions butmuchlowerthan thepotential to emit. In an effort to maintain the validity of the SIP attainment demonstration, Kaiser has voluntarily requested that PMlO emissions from the skimcoolerbe limitedto a level such that Kaiser'spotential to emitwillbe equal to or less than the levels used for the SIP modeling. As allowed in WAC 173-400-091, Kaiser has requested, in Raymond J. Milchovich's letter, datedAugust 8,

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1995, voluntary emission limits on the skim cooler's potential to emit. Source testing at the facility has shown that PM emissions are below 0:01 grains per dry standard cubic foot, corresponding to 50.0 pounds of PM emittedper day. Kaiser's request has been reviewed potential to emit limitation shall required in D. below: by be SCAPCA. met by The following the facility as

1. PMlO 

### emissions fromthe skilo. cooler shallnot exceed 50.0 pounds per day. 

### To ensure that the above emission limit ismet, the facility shall meet the following: 

### A. SCAPCA may require testing to verify 

### compliance with the 50.0 pounds per day PMlO emission limit. Testing shall be done in 

### accordance with EPA reference methods as found in 40 CFR Part 51 (1995). PM emissions shallbe determined from the average ofthree valid 1-hour, or longer, test runs. PMlO emissions shallbe assumed to equal PM emissions unlessKaiser provides appropriate technical documentation to demonstrate otherwise. Upon submittalof suchdocumentation, SCAPCAmay revise the method for determining PMlO emissions. B. An operation andmaintenance plan for the skim cooler baghouse shall be developed and submitted to SCAPCA for approval within 30 days of the effective date of this order. The plan shall include, at a minimum:

· routine maintenance activities, required to keep the control system in proper operating condition, including manufacturer recommended operation and maintenance procedures

· a description of recordkeeping activities, including thoserecordsbeingkept, method(s) ofrecordkeeping, and length of time that records are kept. C. Maintenance records shallbe kept for the baghouse. Compliance with this condition may be demonstrated by implementing a computerized preventative maintenance system that regularly schedules and tracks maintenance activities. All records shallbe kept for a minimum of two years. D. This order shall take effect upon EPA approval of SCAPCA Order 91-01 as part of the Washington State Implementation Plan.

Ko..i•or Vol.untuy Emi.ss:<on Limit Sk:Ltn Cool.e" SCAPCA Ordo.x #96-04 !>&!:<> Hsued: Aprll 24, 1995 nat"Mo<ii:Ei•c:l: Mlly a, ngs P&q., 2

### Any proposed deviation from this order shall require revision or revocation of this order. The revision or revocation shall occur prior to the deviation. This order does not relieve the proponent of comply with all other applicable federal, regulations and requirements. the obligation to state and local
The provisions of this authorization are severable and, if any provision of this order, or the application of any provision of this orderto anycircumstance, isheldinvalid, the applicationof such provision to other circumstances, and the remainder of this order shall not be affected thereby. This order may be appealed to Pollution Control Hearings Board c/o Environmental Hearings Office PO Box 40903 4224 6thAvenue SE, Building

# nz, Rowe Six Lacey, Wa 98504-0903 Appeals must be filed within 30 days after receipt of this order. Concurrently a copy of the appeal must be sent to the Spokane CountyAir Pollution Control Authority, West 1101 College Avenue, Room 403, 

### Spokane, Wa 99201. ORDERED BY:

DIRECTOR**~ser Vo~unt&Iy** **Emiss~on L~t**  !lltim Coolar BcaFCAara.r fS5-n4**D~te l~su.d:**  Apr1l 24, 1996 Da.teModi:!!"-<>d' ""'Y a, 1995**·~'**