20070641 Ver 1_Emails_20070511

Dunhill hold bullets 07-0641
Subject: Dunhill hold bullets 07-0641
From: Annette Lucas <[e-mail]>
Date: Wed, 09 May 2007 14:08:46 -0400
To: Ian McMillan <[e-mail]>
Ian,
Here are the on hold bullets for Dunhill:
1. Please provide the calculations for velocity at the outlet of FES #400 to show
that this discharge will not cause erosion in the wetland (i.e., that it is under 2
fps for the 10-year storm).
2. For the bioretention area, please provide:
a. A DWQ bioretention area worksheet as well as all of the information listed in
Part II: Required Items Checklist.
b. A detail of the underdrain system in plan and section view.
c. Plans and specifications for planting.
d. Soil specifications.
e. A specification for double shredded hardwood mulch rather than pine straw.
f. The correct common name for /Myrica cerifera/.
3. For the level spreader, please provide:
a. A DWQ level spreader worksheet as well as all of the information listed in Part
II: Required Items Checklist.
b. A plan view drawing that shows the location and size of the forebay as well as
the piping from the flow splitter to the forebay.
c. A plan view drawing that shows that the level spreader will be constructed
parallel to contour lines and that the slopes will be less than six percent. If
grading is needed to accomplish this, please show the appropriate grading lines.
That's all,
Annette
Annette Lucas <[e-mail]>
Environmental Engineer III
401 Wetlands Oversight/Express Unit
NC Division of Water Quality
1 of 1 5/11/2007 9:16 AM