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Hi Walt- "David Krask" <dkrask@mde.state.md.us> WalterWilkie/R3/USEPNUS@EPA Andrew Hass/R3/USEPNUS@EPA, <Hyden.Lorett@epamail.epa.gov>, Cathleen Kennedy/R3/USEPNUS@ 08/14/2008 12:46 PM MDE PM-2.5/PM-10 site closure notice-FMC/Fairfield

This email serves as formal notification that MDE will be shutting down the FMC-Fairfield PM-2.5 and PM-10 monitoring site (AIRS code 24510035) effective August 18, 2009. The reason for the shutdown is the closure and demolition of the FMC fertilizer manufacturing plant where the site is location. Demolition is scheduled for September 2008 and MDE has been asked to have our equipment removed next week. MDE currently does not plan to find a new site to replace the FMCFairfield site. We believe our remaining PM-2.5 network si adequate to characterize PM-2.5 concentrations in the Baltimore MSA. Please see the attached documentation supporting this decision (the accompanying powerpoint will have to be sent as a separate email or posted to an ftp site because it is too large for this email). Since the FMC site was used to meet collocation requirements for both PM-2.5 and PM-10, MDE plans to use Padonia as the new PM-2.5 collocated site and Glen Burnie and the new collocated PM-10 site. I am not sure how this network change should be incorporated into MDE's Annual Network Plan. Should an amendment to the plan be submitted, and if so, how does this process work? Does this information have to transmitted by the MD Secretary of the Environment? Please contact me at your convenience so we can discuss this matter further. Best Regards, Dave David J. Krask Maryland Department of the Environment ARMA/Air Monitoring Program 1800 Washington Blvd. Baltimore, Md. 21230-1720 Phone: 410.537.3756 Fax: 410.537.4243 Email: dkrask@mde.state.md.us

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««GWIASIG 0.07»»

### Closure ofthe

### FMC - Fairfield AmbientAirMonitoring Site 1. 

### AQS ID: 2. Location: 245100035 FMC Corporation 1701 E Patapsco Ave. Baltimore City, Maryland 21226 

### 3. Metro Statistical Area (MSA): Baltimore

- Towson 

### 4. Reason for Closure: The FMC Agricultural Products Facility is being shut down and the site is being demolished. Demolition is scheduledto start in early September 2008 

### 5. Parameters Monitored: PMlO - Startdate: January 1984, co-locatedmonitors. PM2 .5 - Start date: January 1999, co-locatedmonitors 

### 6. Proposed Plan and Additional Information: The Maryland Department ofthe Environment (MDE) plans to shutdownthe FMCFairfield ambient air monitoring site during the week ofAugust 18,2008 for the following reasons:
• The present location is being demolished.
• The present location was originally sited to be representative ofa neighborhood and its monitoring objective was intendedto be population exposure. Boththese items are no longertrue ofthe present location. The population density ofthe area immediately surrounding the present site has declined overthe years and according to the 2000 census data contains 0.4

- 2,000 personsper square mile. See attachment A, FMC- Fairfield Closure Analysis.
• There are three PM2 .5 monitoring siteswithin 10 km's ofthe present location and an additional three PM2 .5 monitoring sites located within 20 km's ofthe present location. With six PM2 .5 monitoring sites within 20 km's ofthe present site, regional PM2 .5 will adequatelybe monitored. See attachment A, FMC

- Fairfield Closure Analysis.
• The preliminary annual PM2 .5 design value for the FMC

- Fairfield monitoring site is notthe maximum design value inthe Baltimore Nonattainment Area (BNAA). The preliminary annual design value for the FMC-Fairfield site is 15.1 Ilg/m3 and the leading BNAA annual PM2.5 design value is 15.6 Ilg/m3 at the SoutheastPolice Station. See attachment A, FMC- Fairfield Closure Analysis.
• The preliminary 24-hour PM2 .5 design value for the FMC

- Fairfield monitoring site is notthe maximum design value. The preliminary 24-hourdesign value for the FMC-Fairfield site is 36 Ilg/m3 and the leading 24-hourPM2 .5 design value is 

### 37 Ilg/m3 at the Southeast Police Station. See attachment A, FMC- Fairfield Closure Analysis.
1-2Closure ofthe FMC - Fairfield Ambient AirMonitoring Site

• The PM2 .5(FRM) monitor will be relocated withinthe BaltimoreNAAto the Padonia 

### (240051007) air monitoring site, where there's already a PM2 .5(FRM) monitor. Padoniawill nowhave co-located PM2.5 (FRM) monitors. This ensures thatthe necessary numberofco-locatedPM2.5 (FRM) monitors will be inthe BNAA.
• The PMlO (filterbased) monitor will be relocated to the GlenBurnie 

### (240031003) air monitoring site, where there's already a PMlOmonitor. GlenBurnie will now have co-locatedPMlO (filterbased) monitors and thus maintainthe necessary number ofco-locatedPMlO monitors inBaltimore MSA inMaryland.



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