### Appendix C

E

- mail Correspondence from EPA to ACHD dated 2/19/2008

Approval of Allegheny County Air M----- Original Message

-----

From: Wilkie.Walter@epamail.epa.gov

[mailto:Wilkie.Walter@epamail.epa.gov]

Sent: Tuesday, February 19, 2008 2:33 PM

To: Stern, Darrell; Katz.Irwin@epamail.epa.gov

Cc: Dixon, Bruce; Graham, Jayme; Westman, Roger;

Erdman.Ted@ epamail.epa.gov; Kennedy.Cathleen@epamail.epa.gov;

Hass.Andrew@epamail.epa.gov; Cobbs.Edward@epamail.epa.gov;

Katz.Judith@epamail.epa.gov; Arnold.David@epamail.epa.gov

Subject: Re: Allegheny County air monitoring reduction request

Darrell:

EPA

- R 3 has reviewed the proposed reductions to ACHD's air monitoring

systems as described in your below email message. Based on our review

of this information, we concur with the air monitoring system changes

proposed by ACHD. Please ensure that these chan ges are reflected in

ACHD's July 1, 2008 annual air monitoring network plan as required by

40 CFR Part 58. If you should have any questions, please give me a

call or send an email. Take care.

Walter K. Wilkie, Branch Chief

Air Quality Analysis B ranch (3AP22)

Air Protection Division

EPA

- Region III

(215) 814

- 2150

"Stern, Darrell"

<Dstern@achd.net

> To

Walter Wilkie/R3/USEPA/US@EPA

01/17/2008 03:42 cc

PM Ted Erdman/R3/USEPA/US@EPA,

"Dixon, Bruce" <BDixon@achd.net>,

"Westman, Roger"

<RWestman@achd.net>, "Graham,

Jayme" <JGraham@achd.net>

Subject

Allegheny County air monitoring

reduction request

Walter,

This is a follow up to our conference call with your agency on

January 16, 2008. During the call a request was mad e by the AirQuality Program to reduce the Allegheny County air monitoring network

to a more manageable size. This reduction is needed due to extra

duties associated with the installation and operation of new air

toxics and NCORE2 monitors. T he recent retirement of two senior

technicians has made the reductions even more necessary. We have

carefully analyzed the existing monitoring network and are proposing

the following reductions which we feel will have minimal negative

impact o n our program goals:

Monitors to be considered for discontinuation

Hazelwood monitoring site, AQS# 42

- 003

- 0021

SO2 and PM10 TEOM

This site was identified as having siting violations in the 2007

TSA as determined by EPA personnel

The LTV coke works is no longer in operation

North Park, AQS# 42

- 003

- 0093

PM2.5 FRM monitor every six day, classified as a special purpose monitor

(SPM)

* We plan to bring this monitor back on

- line after we fill our vacant

staff position

Moon T ownship, AQS# 42

- 003

- 0095

PM2.5 FRM monitor every six day, classified as a special purpose monitor

(SPM)

PM10 SSI HighVol, every six day

SUMMA canister and carbonyl sampling Avalon, Stowe and South Fayette,

These samplers were operated as part of th e Pittsburgh Air Toxics Study.

This portion of the study is now concluded.

Thank you for your consideration of this proposal. We will wait for the

approval of your agency before any of the above actions are taken.

Sincerely,

Darrell Stern

ACHD

Air Quality Program

412 578 8143

(See attached file: 2008 monitoring network review(web).pdf)