19990247 Ver 1_Email_20110822

FW: R2123CE Page 1 of 3
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FW: R2123CE /ve
Lespinasse, Polly
Sent: Monday, August 22, 2011 11:18 AM
To: Carrillo, Sonia
Attachments: R-2123 CE August 12 2011 P-l.pdf (7 MB)
Looks like you didn't get this one either.
From: Turchy, Michael A
Sent: Friday, August 12, 20113:51 PM
To: Lespinasse, Polly; [e-mail]; Thompson, Larry B; Chambers, Marla J
Cc: Mabry, Virginia G; Phillip Todd; John Johnson
Subject: RE: R2123CE
Hi Polly,
To ensure all your questions have been addressed, I included the firm's reply in-line in red. Any change
below that requires a change in the drawing (i.e. turning on the stabilization (rip rap) layer) has been
attached to this email, and has also been updated on the NCDOT permit applications website. These
include permit drawing pages 14, 15, 28, 29, 40, 42, 45, 46, 48, and 49.
Please let me know if you have any questions.
Thanks,
Michael
From: Lespinasse, Polly
Sent: Tuesday, August 02, 2011
To: Turchy, Michael A
Cc: [e-mail];
Subject: R2123CE
Michael,
28 PM
Thompson, Larry B; Chambers, Marla J
I have completed the review of the above referenced plans and have some questions (as usual!). They are:
Permit Site 2: There are two RCPs (42" and 48") that I have questions about. The 42" has a ditch discharging
into. Per the 4C notes, there was an agreement to use Class I riprap at the confluence. The detail for the
adjacent ditch (Detail B), shows Class B riprap. No other riprap size designation is apparent on the plans. Also,
the outlet of the 48" shows riprap, but no size or detail is provided. The plans usually show the riprap size with a
note about the riprap being on the banks only.
The permit drawing now shows the label stating "20 tons Class I riprap w/ 39 sy filter fabric on banks only". The
larger Class I riprap will take precedence over the Class B riprap where the outlet and ditch converge.
Permit Site 5: At the inlet of the upstream 9x10 RCBCs, there is what appears to be a 30" RCP discharging to the
stream with "rock bank stabilization" depicted in the what appears to be the middle of the channel. Why is it
located there (since there shouldn't be any stream banks there) and what size riprap is proposed?
At the outlet of the 30" RCP, we are transitioning from the existing stream banks of Stony Creek to the entrance
of the RCBC. In a case such as this one, the riprap will not extend in to the stream once it is constructed; it will
only be along the bank transition to provide stability. The permit drawing now shows the label stating "15 tons
Class I riprap w/ 30 sy filter fabric on banks only".
Permit Site 8: What size riprap is going to be used at the outlet of the 66" RCP? The plans usually show the
riprap size with a note about the riprap being on the banks only.
The permit drawing now shows the label stating "33 tons Class I riprap w/ 62 sy filter fabric on banks only".
https://mail.nc.gov/owa/?ae=ltem&t=IPM.Note&id=RgAAAADMSzLcd9W 2TJHI4%2bm... 8/25/2011
FW: R2123CE Page 2 of 3
Permit Drawing Sheet 41 of 56 at approximately Sta. 75: The cut slope is about 3' from the stream based on the
scale provided. Has Roadside Environmental determined how they are going to stabilize this area so that
sediment doesn't get in the stream during construction? Will there be enough area to move equipment around
without impacting the stream?
From -RPE- 74+00 - 75+00 LT, the ditch is transitioning from a cut ditch to a fill slope. Our erosion control plans
call for a temporary diversion ditch to be installed to separate the construction area from the non-construction
area. The temporary diversion ditch will take the drainage in the construction area to the appropriate erosion
control filtering device. Measures will be installed to alert all those working in the area that it is a jurisdictional
site and not to enter it.
Permit Site 10: The 4C notes indicate that riprap will be on the right bank only. The plans show it on both banks
as it leaves the 18" pipe from the basin. What size riprap is going to be used? The plans usually show the riprap
size with a note about the riprap being on the banks only.
The cell shown depicting riprap at the end of the 18" RCP is a standard cell provided by NCDOT to indicate that
riprap and filter fabric will be used. In a case such as this one, the riprap will not extend in to the stream once it
is constructed; it will only be along the bank to provide stability. The permit drawing now shows the label
stating "3 tons Class B riprap w/ 10 sy filter fabric on banks only".
Permit Site 11: What size riprap is going to be used? The plans usually show the riprap size with a note about
the riprap being on the banks only.
The permit drawing now shows the label stating "11 tons Class I riprap w/ 22 sy filter fabric on banks only".
Permit Site 13: The plans show riprap at the inlet of the 36" RCP at the confluence with a 24" CSP. Is the stream
jurisdictional in this area? If so, are riprap impacts accounted for? What size riprap will be used? If in a
jurisdictional stream, it must be embedded.
The stream is not considered jurisdictional until approximately 77' downstream of the 36" RCP entrance.
Therefore, it was not treated as a jurisdictional stream since the upstream portion is not jurisdictional.
(Per the 4B minutes: "The jurisdictional stream -Y- 62+50 RT begins inside the proposed design and will be a
total take.") The rirpap note at the outlet of the 24" CSP states "5 tons CI B riprap w/ 14 sy filter fabric" and is
now shown on the permit drawing.
Permit Site 14: The plans show a stream being relocated to a ditch. The 4C notes indicate that the slope of the
ditch is 2.7% and the detail shows Class B. Additional stormwater is being added to the ditch/stream system at
approximately Sta. 66 (mainline of 85). DWQ is recommending that larger riprap be used from at least this point
then downstream to prevent migration of riprap into the undisturbed portion of the stream. It also shows a
dissipater pad in the center of the stream. All riprap must be embedded since this is still a jurisdictional stream.
Additionally, erosion control may be an issue as this appears to be a steep fill slope. Roadside Environmental
should be aware of the challenges of preventing sediment loss in this area.
Per the 4B meeting minutes:
Marella Buncick was concerned with the stability of the confluence of the new stream alignment and the existing
stream and also the three outlet pipes just downstream of said confluence. The Design-Build team proposed
trying to outlet the pipes at one location. Also it was proposed that the Team would extend the stream alignment
to just beyond those outlets to provide riprap stability before the confluence with the existing channel and to
provide a smooth transition and stream stability from the new relocated channel and the existing stream reach.
The outlet of the 30" RCP uses Class I riprap and will take precedence over the Class B riprap in the ditch. The
rirpap note at the outlet of the 30" RCP states 11 tons Class I riprap w/ 22 sy filter fabric" and is now shown on
the permit drawing. For erosion control, an earth berm with slope drains will be used at the top of the slope with
silt fence at the bottom (this meets the 1/4 ac per 100' of silt fence criteria). Seeding will be staged in to the
construction as well as erosion control matting on the slope.
Permit Site 17: The 4C notes indicate that Class II riprap would be used where the ditches tie in to the stream.
This isn't depicted on the plans and all the details for the ditches show Class B riprap.
The detail for the Lateral Base Ditch Detail B entering from the left does use Class B riprap. The RCBC Excavation
Detail KK shows using Class II riprap. The Class 11 riprap will be carried from the bottom of the bank up to the top
of the bank where ditch detail B meets it. So, the larger stone will take precedence in this area.
If you have any questions, please let me know.
https://mail.nc. gov/owa/?ae=Item&t=IPM.Note&i d=RgAAAADMSzLcd9W 2TJfE4%2bm... 8/25/2011
FW: R2123CE
Thanks.
Polly Lespinasse - [e-mail]
Environmental Senior Specialist
North Carolina Dept. of Environment & Natural Resources
Div. of Water Quality
610 E. Center Ave., Suite 301
Mooresville, NC 28115
Ph: 704.235.2190 Fax: [phone]
Page 3 of 3
E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and
may be disclosed to third parties unless the content is exempt by statute or other regulation.
Email correspondence to and from this sender is subject to the N.C. Public Records Law and may be disclosed to third parties.
https://mai l.nc.gov/owa/?ae=Item&t=IPM.Note&id=RgAAAADMSzLcd9 W 2TJfH4%2bm... 8/25/2011

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