20130361 Ver 1_More Info Received_20130508

Homewood, Sue
From: Leonard Rindner[[e-mail]]
Sent: Wednesday, May 08, 2013 1:18 PM
To: Homewood, Sue
Cc: Tim Clinkscales
Subject: FW: Project#2013-0361
Attachments: C-3 Grading Plan C-3.1.pdf; C-3 Grading Plan C-3.pdf
Hi Sue:
Please see Tim Clinkscale's comments below in response to your questions. Let me know if you have any questions.
Len
Comment to Ms. Homewood comments.
In our due diligence for the site,we tried many different combinations of BMP's to meet the 85%TSS removal required
for the site. The BMP's that we explored where all types of infiltration devices (basins, pipe trenches), dry basins and
use of permeable pavement. For these devices,the soils of the site do meet the parameters required. Based on our
engineering judgment using the site parameters and soils report,we believed meeting the States 85%TSS removal along
with being responsible for runoff attenuation on downstream properties is best achieved through the use of a wet
detention pond. To minimize the impacts,we have designed retaining walls for the pond. Even with this approach, and
increasing the slopes to 2.5:1 per soil scientist recommendation,the grades ties into natural grade at our property line.
For safety reasons,we did not want to drop the permanent pool of the pond any deeper, to again minimize the drop off
from the parking lot to the pond.
Tim Clinkscales PE PLS
wwww-
PARAMOUNTE ENGINEERING, INC
5911 Oleander Drive, Suite 201
Wilmington, NC 28403
OFFICE: [phone]
CELL: [phone]
FAX: [phone]
www.paramounte-eng.com
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