## .. ' AIR POLLUTION SSP Fax 3031820218 Jul 26 2001 04:11pm PO01/005 

# STATE OF COLORADO**~** Oedicated to**p~ecting** and**~1he** tIaGIIh MId ettviflXlment of tne**~** 01**~** 4300 Ctteny CroeI( Or. S. t.:abGt8f&aty Ser\4ce: CMsIon Oenwt. Ootorado 80246-1530 8100**~** BIvd_ Phane (30;1) fSl-2000 Denwet. Cabado 80230-892.8 TOO IJpe (303) 691-7700 (303) $92-3090 t.ocaeed ltI Glendale. CQIorado 

## Air Pollution Control DiVision
To: Fax #:


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## Our Fax #:'303-782-0278 

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### 303-692-3100 

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__ _ Comments:**l~' ~fu** AIR POLLUTION SSP Fax 3037820278
AIR POLLUTION CONTROL DIVISION Field Inspection Repon COUNTY NUMBER: 031 SOURCE NUMBER: 0129 COMPANY: Denver Metal Finishing SITE LOCATION; Denver CONTACT PERSON: Kelty Morgan TELEPHONE NUMBER: (303) 295-1380 INSPECTION: ROUTINE[ J COMPLAlNT( ] FA[] STAcK TEST LX] HOURS: PROTOCOL: 1.0 INSPECTION: 6.0 TRAVEL: 1.0 REPORT: 3.0 EMISSION POINTS SUBJECT TO MACT: 1 - Subpart N Jul 26 2007 04;11pm P002/005

DATE: 10-8-97 INSPECTOR: Thomas Lovell COUNTY: Denver TIME: AIRS UPDATE: PBruMr NUMBElt: TOTAL: 11.0
On October 8, 1997. a stack test was performed at the Denver Metal Fmisbiog Facility in Denver. This source is subject to the chromium mCf standard of 40 C. F. R. Pan 63, Subpart N. There are three hard chromium electroplating tanks and one decorative cbromiumelectroplating tank at the facility. The test was performed on the common stack for the three hatd chromium electroplating ranks. Unlike most hard chrome platlng facilities, no add-on air pollution control device is used to control emiss.i.m,s. Fume suppressants are the only controls used in order to ma.intaJn compliance with the standard. At one time, a packed bed scrubber was used to control emidODS, but the packing material was removed and the scrubbe:{ is now empty. The surface tension of tank 501 was measured at 34.t;i7 dynes/CD] on the day of the testing. Surface tension in tank 502 was 35.73 dynes/em and tank 503 was 37.16 dynes/em. The results of the It:StiDg are summarized in the table below. Run 1 Run 2 Run 3 Average Tank 501 Current (amps) 122 153 173 149 Tauk 502 Current (amps) 700 700 700 700

.. Tank 503 Current (amps) 1383 2454 1983 1940 Stack Flow (dscfm) 2946 2956 2769 2890 Chromium EmissioJJS (mg/dscm) 0.0022 0.0076 0.0131 0.0076 Chromimn Emissions (mgIhr) 11 38 62 37 Cbrolllium EmissiODS (lbs/hr) 0.025 0.084 0.135 0.081 CImnnium Emissions (tonslp:) 0.11 0.37 0.59 0.36 The results of the testing show this source to be in compliance with the cbxomium MACT emission standard for small existing bard chromium electroplaters of 0.030 mg/dscm. The source shouldmaintain the surface tension of the baths shoUld be majntained at or below 37 dyneslcm in order to show compliance on an ongoing basis. The decorative chromium electroplating tank must also measure surface tens10n in order to show compliance with the standard. The surface rension standard for decorative chromium electroplating tanks and cbIomium anodizing tanks is 45 dynes/em. Records of surface tension measurements made from December 26 of 1995 through September 5 of 1997 show that the su.rface tension did not exceed this level during that time The source must continue to measure and record the surface tension of lhis bath once every 40 hollIS of tank operation to show compliance with the standard. If a swface tension which exceeds this limit is recorded, the source xnust revert to performing these measurements every four hours of tanks operation. as per the measurement schedule contained in the standard.

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