20091105 Ver 1_Staff Comments_20091009

Lucas, Annette
From: Lucas, Annette
Sent: Friday, October 09, 2009 4:29 PM
To: 'Morgan, Liane'
Cc: Karoly, Cyndi
Subject: RE: Site Map for Sanford
Liane:
I have spoken with my supervisor Cyndi Karoly about the Sanford WWTP site, specifically about the drainage areas that
we had not determined as high or low density based on our Monday phone conversation. Here is what Cyndi and I
determined:
Drainage area F: You will not need to provide a stormwater BMP since all of the impervious surface is existing.
Drainage areas B and E: We consider these to be high density and therefore the stormwater runoff from these areas will
need to be treated by a properly designed BMP. In drainage area B, all of the impervious surface is concentrated very
close to the outlet structure and all impervious surfaces are being drained by pipes. Drainage area E is 45% impervious,
which puts it into the high density category.
Drainage area C: You have currently estimated the impervious surface at 23%. When you formally submit, we will need
a detailed and clear site plan with a detailed inventory of impervious surfaces to determine whether the drainage area is
above or below 24% impervious.
Please contact me if you have questions.
Thanks,
Annette
Annette Lucas, PE
NC Division of Water Quality - 401 Oversight/Express Unit
2321 Crabtree Boulevard, Suite 250
Raleigh, North Carolina 27604
Phone: [phone]
Fax: [phone]
Email correspondence to and from this address may be subject to the North Carolina Public Records Law and may be
disclosed to third parties.
From: Morgan, Liane [mailto:[e-mail]]
Sent: Thursday, October 01, 2009 3:19 PM
To: Lucas, Annette
Subject: Site Map for Sanford
Annette,
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