20140554 Ver 1_Emails_20150128

Smith, Cherri L
From: Bob Zarzecki <bzarzecki @sandec.com>
Sent: Wednesday, January 28, 2015 9:43 AM
To: Smith, Cherri L; Lastinger, James C SAW ( James .C.Lastinger @usace. army. mi1)
Subject: Hinton Oaks Blvd. Extension & Wake Stone Property Commercial (DWR#
14- 0554 /SAW- 2014- 00862/S &EC12181 - Changes to SMP & Avoidance of Buffer Impact #7
Attachments: DWR Approval_06- 17- 2014.pdf; SAW- 2014- 00862.pdf; MRTF 2014 -00862 Hinton Oaks
Wake Stone Commercial.pdf; inv23328 WR Hinton Oaks Blvd Wake Stone Commercial.pdf;
01- 12- 15- Wakestone -I M -7. pdf
Cherri & James:
Attached are the approval letters for the Hinton Oaks Blvd. Extension & Wake Stone Property
Commercial project. Also attached are the EEP receipt and mitigation transfer documents. The last
attachment is a revised plan reflecting changes that the Town of Knightdale wanted made to the
previously approved stormwater management plan (SMP). These changes do not change the
wetland or stream impacts or the overall project in any way, so I don't think any changes to the
USACE verifications are required.
However, this plan does result in the ability to eliminate the need for the buffer impacts associated
with the previously approved BMP discharge (Buffer Impact 7; Zone 1 - 290 sf & Zone 2 - 581 sf =
871 sf total).
If acceptable, please revise the DWR approval letter as such (removing buffer Impact 7). The
previously approved SMP was sent to DWR prior to beginning construction of the main stream
crossing. We'll include the revised DWR approval to obtain the final, revised SMP approval from the
Town and will provide a copy of the final, revised SMP approval to DWR.
The only changes to the plan are to impact exhibit "DWG. #IM.T'. Again no changes to the wetland
impacts in this location, only avoidance of buffer impacts. The riprap apron is designed to dissipate
energy from the bypass flow to non - erosive flow and divert the flow to the north into the wetland prior
to entering the buffer. The Town determined that the BMP to the west of Hinton Oaks Blvd. was not
necessary and the majority of that water will now go to a scour hole, the BMP to the south of Hinton
Oaks Blvd., and a small amount of the runoff from the road will enter the bypass pipe. Again, this
bypass pipe discharges at non - erosive velocities into a wetland prior to entering the buffer, and as
such does not result in a direct discharge through the buffer to the stream. The elimination of this
BMP and associated discharge pipe allowed for the avoidance of buffer Impact 7.
Please let me know if you need paper copies of this information or any additional information.
PS ... The construction to date has been focused on the crossing and it remains under construction.
It looked good the last time I was out there.
Thanks!
1 M ��
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