20081817 Ver 1_Triage Comments_20090325

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Triage Comment Sheet
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Triaged By:
Lk h?, ) -e Date: v
Reviewer 1
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Reviewer 2 r Date: 2-1
Reviewer 3 Date:
? Issue Project (Reviewer 1)
? Issue Project (Reviewer 2)
1
Issue w' onditions eviewer 1
V
Issue with conditions (Reviewer 2)
A .,
? More Information (Reviewer 1) ? More Information (Reviewer 2)
? Return Application (Reviewer 1) ? Return Application (Reviewer 2)
? Send to Regions (Reviewer 1)
? Send to Regions (Reviewer 2)
SATriage FormsUriage Issue Sheet.doe
PLEASE PRINT CLEARLY
08-1817 NE Judd Parkway Extension
AML Comments
March 25, 2009
At Impact Area 3, the scour hole on the northwest quadrant of the road crossing is
placed upslope of an area that is too steep to allow for diffuse flow (greater than
eight percent slope). Please provide EITHER a level spreader in another location
with appropriate slopes OR a BMP that removes a minimum of 85 percent TSS
and 30 percent TN from the stormwater generated by this project. If you provide
a BMP, then include a completed BMP Supplement Form, with all the required
items. The BMP Supplement Forms are available at:
http://h2o.enr.state.nc.us/su/bmp forms.htm.
2. For the proposed level spreader at Impact Area 3, sheet 2-C showing the plan
details and section view of the level spreader was omitted from the submittal.
Please include this sheet in the resubmittal. In addition, please show plan details
of the proposed flow splitting device.
All stormwater discharged in the vicinity of Impact Area 4, must be discharged
through a correctly designed level spreader or scour hole per the requirements of
the Neuse Buffer Rule. Level spreader design requirements are set forth in
Chapter 8 of the North Carolina Stormwater BMP Manual, available at:
http://h2o. enr. statc.nc. us/su/bmpforms.htm.
4. For every scour hole that is proposed on the project, please provide the following
information:
a. The drainage area and impervious surface area draining to the device,
b. The peak flow from the 1 in/hr and 10-year storms,
c. The elevations of the natural ground at the location of the scour hole and
the top of bank of the receiving stream,
d. The slope of the filter strip,
e. Plan details of the scour hole that include the dimensions, one foot topo
lines between the device and the top of bank, and
f. A signed and notarized Operation and Maintenance Agreement.
For every proposed discharge to a wetland on the site, please provide details of
the proposed dissipation devices. In addition, provide supporting calculations that
show that the device has been designed to limit the velocity of stormwater to less
than two feet per second during the peak flow from the ten-year storm.