20140277 Ver 2_U-4726DD NWP_WQC application package_20170814

Carpenter,Kristi
From: Norton, April R
Sent: Monday, August 14, 2017 12:57 PM
To: Carpenter,Kristi
Subject: FW: U-4726DD NWP_WQC application package
Attachments: DSC_0854jpg
Thanks,
April
From: Scott Davis [mailto:[e-mail]
Sent: Monday, August 14, 2017 12:03 PM
To: Norton, April R<[e-mail]>; Samantha Dailey
([e-mail]) <[e-mail]>
Cc: Sandy Smith <[e-mail]>
Subject: RE: U-4726DD NWP_WQC application package
Good morning April,
I hope that you had a nice weekend. We have looked over your questions, and
apologize for the confusion. The words in the cover letter describing Site 2: "The
existing 48-inch CMP" are wrong and appear to be a victim of pasting information from
the Site 1 description. There are actually two existing 54-inch corrugated steel pipes at
Site 2. The southern pipe currently maintains normal flow, while the second (northern)
pipe is at located to pass flood flows. I have attached a photo of the upstream end of
the culverts that shows the normal flow culvert on the left and (less clearly behind the
vines and human) the culvert located to pass flood flows. No widening of the stream
channel is anticipated as the downstream end of the culverts will each receive a 9-foot
CSP with a gasket sleeve connection and end wall.
Per the design engineer, there are no proposed channel modifications or benches since
both pipes are open and flowing in the existing condition. The pipe extensions and
headwall construction will be completed "in the dry" using a combination of impervious
dikes with either temporary pipes and/or pumping as necessary. This will be addressed
during the preconstruction meeting with the selected Contractor.
Again, I sincerely apologize for the confusion about the existing conditions at Site
2. Please let us know if this answers your questions or if you need anything in addition.
Sincerely,
Scott
Scott Davis
Senior Scientist/Project Manager
Axiom Environmental, Inc.
218 Snow Avenue, Raleigh, NC 27603
919-696-3045

From: Norton, April R [mailto:april.norton@ncdenr.�ov]
Sent: Monday, August 14, 2017 8:53 AM
To: Scott Davis <[e-mail]�>; Samantha Dailey
([e-mail]) <[e-mail]>
Cc: Sandy Smith <[e-mail]>
Subject: RE: U-4726DD NWP_WQC application package
Hi Scott,
I have reviewed your PCN application for TIP Project # U-4726DD, Rogers Road Sidewalk
Project, SR 1729. Could you please address the below concerns?
The application narrative (cover letter) for Impact Site 2 states, "The existing 48-
inch CMP will be extended by 9 feet with two 54-inch CSP extensions that
incorporates gasket sleeve connections and endwalls." The drawings (sheet
C1.15) show an existing 54-inch CMP. For clarity, please confirm if the existing
culvert is 54 inches or 48 inches.
It is proposed to install two-54 inches culverts. Per Condition 11 of GC 4088,
please provide details on how you are going to maintain the physical integrity of
the stream above and below the culvert. If multiple pipes or barrels are
required, they shall be designed to mimic natural stream cross section as closely
as possible, including pipes or barrels at flood plain elevation and/or sills where
appropriate. Widening the stream channel should be avoided. Stream channel
widening at the inlet or outlet end of structures typically decreases water
velocity causing sediment deposition that requires increased maintenance and
disrupts aquatic life passage. A construction sequence and detail should be
provided to ensure that the contractor is clear on construction.
Thanks,
April
From: Scott Davis [mailto:[e-mail]�]
Sent: Monday, August 07, 2017 3:45 PM
To: Samantha Dailey ([e-mail])
<[e-mail]>; Norton, April R <april.norton@ncdenr.�ov>
Cc: Sandy Smith <[e-mail]�>
Subject: U-4726DD NWP_WQC application package
Good afternoon Samantha and April,
It has been brought to my attention (thank you April) that Table 1 of the cover letter
provided for this project inadvertently uses the greater than symbol (>) rather than less
than (<) in depicting acres of impact. All impacts are less than 0.01 acre (<0.01 acre).
Please accept the following revised Table 1 that should appear in the cover letter with
my apologies:

Table 1. Project Impacts
Permanent Temporary Total Permanent Temporary Total
Stream Stream Stream Wetland Wetland Wetland
Impacted Impacts Impacts Impacts Impacts Impacts Impacts
Site Waterbody (feet) (feet) (feet) (acres) (acres) (acres)
1 UT to Bolin Creek 9 13 22 <0.01 -- <0.01
(Stream S1)
2 UT to Bolin Creek 9 11 20 <0.01 -- <0.01
(Stream 52)
Total 18 24 42 <0.01 -- <0.01
Please let us know if this creates any particular difficulties or if you have any questions.
Sincerely,
Scott
Scott G. Davis
Seniar Scientist/Project Manager
Axiom Environmental, inc.
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