From: "Wearmouth, Ann" <ann.wearmouth@mirant.com>

To: Josh Hall/DC/USEPA/US@EPA

Cc: "D'Alesandro, Ray" <R aymond.DAlesandro@mirant.com>

Date: 03/02/2010 02:07 PM

Subject: RE: EPA site visit to Dickerson

Hi Josh, Here's the documentation you asked for. There are 2 npdes

fact sheets - we had amended our npdes application to include the

scrubber WWTP outfall. You'll also see two mass balance diagrams based on limestone quality. I'm missing a plant water balance. I'll get that for you.

We're expecting you at 11 on the 9th. Lunches will be provided at an exorbitant rate I'm told ;) The guards will have the list you give us and will direct you to the main offi ce, but I should be there to take you on in. Mickey Lynn is the site contact if I'm running late. The address you have is correct. It's pr etty much a straight shot up Rt 28

from 270. Or take River Rd to 28 depending on where you start. There's a stop light at Martinsburg Rd and Rt 28 that you can't miss. You take that straight back to the site entran ce which is shared with Montgomery County's Waste Incinerator. That should do it. Let me know if you need anything else. By copy to Ray, if one of these documents has changed significantly, please provide the new one. Thanks -a

-----Original Message----- From: Hall.Josh@epamail.epa.gov [m ailto:Hall.Josh@epamail.epa.gov] Sent: Thursday, February 25, 2010 1:36 PM To: Wearmouth, Ann Cc: Jordan.Ronald@epamail.epa.gov; Alicea.Jezebele@epamail.epa.gov; Thomas.Finseth@erg.com Subject: EPA site visit to Dickerson

Ann,

Thanks for helping coordinate a site visit to Mirant's Dickerson Plant on March 9. As I indicated we are available anytime on the 9th, so let me know if folks at the plant have a preference of morning or afternoon. I would expect that we'd be on site between 3-4 hours.

Our focus of the site visit will be the FGD wastewater treatment system and potential sampling points in that sy stem. So that we are prepared ahead of time could you please send any FGD flow diagrams, FGD wastewater treatment engineering/de sign reports, plant water balance,

and NPDES fact sheets. We'll review this material before hand in order to make sure we're up to speed once we arrive on site.

Here's a suggested schedule for visit:

Check-in, Safety Briefing, Intr oduction to Plant and FGD wastewater treatment (WWT) system. Tour of FGD WWT Facility (focus on FGD WWT, potential sample points, staging areas, etc) Debrief from tour, Q & A, etc.

We'll provide our own PPE (hard hats, safety glasses, hearing protection, steel toed boots).

On the tour we plan to take photos of the treatment system particularly potential sample points. We'll burn a CD of the photos for the plant, so they can let us know if there are any photos are sensitive,proprietary or confidential. The purpose of the photos is to help us remember what we saw as well as plan for supplies if we decide to sample one of these plants.

As far as address to the plant, I have:

21200 MARTINSBURG ROAD DICKERSON, MD 20842

Are there any particular instructions that would be helpful, when we arrive at the plant (which gate shoul d we go to, will there be issues if we put the above address into a GPS, etc)

Once we get to the plant, who should we contact, and could we have their phone number?

I will let you know who will be attendi ng next week once I have a better sense on my end, but we'll likely have 6-7 people.

I hope I've remembered everything, but if you think of anything else please let me know.

Thanks again for coordinating this,

Josh Hall U. S. Environmental Protection Agency OW/Office of Science & Technology Engineering & Analysis Division Ph: (202) 566-1002 Fax: (202)566-1053 hall.josh@epa.gov http://www.epa.gov/waterscience/

(See attached file: Semeins System Description.doc)(See attached file: Dickerson npdes fact sheet scrubber. PDF)(See attached file: dickerson npdes fact sheet 2008.PDF)(See att ached file: Dickerson mass balance scrubber.pdf)