20211726 Ver 1_Culvert Details_20211207

Strickland, Bev
From: Jennifer Robertson <[e-mail]>
Sent: Tuesday, December 7, 2021 2:29 PM
To: Johnson, Alan; David Starkel
Cc: Perez, Douglas J; Holden Sabato
Subject: RE: [External] RE: china grove ind 21-1726
Attachments: Culvert Details.png
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Alan,
The culverts at the China Grove project will be single pipe culverts no larger than 48". Headwalls will be used
on either side to minimize stream impacts. See the attached details.
Thank you,
Jennifer L Robertson, President
Environmental, Inc.
338 S. Sharon Amity Road #411
Charlotte, NC 28211
[phone] office
[phone] mobile
www.atlasenvi.com
Offices in Asheville and Charlotte
IRONMENTAL
From: Johnson, Alan <[e-mail]>
Sent: Tuesday, December 7, 2021 8:19 AM
To: Jennifer Robertson <[e-mail]>; David Starkel <[e-mail]>
Cc: Perez, Douglas J <[e-mail]>; Holden Sabato <[e-mail]>
Subject: RE: [External] RE: china grove ind 21-1726
I appreciate the typical design, however, often times culvert size and stream size are not
necessarily compatible. Since culverts are designed to pass various rain events and may
require two culverts or an oversized single culvert. Some are box culverts which are quite
different that a round culvert
We will add some stream monitoring for those headwater channels.
1

DWR
Dlvlslon of Water Resources
Alan D Johnson — Senior Environmental Specialist
NC Dept. of Environment & Natural Resources (NCDENR)
Division of Water Resources - Water Quality Regional Operations
610 East Center Ave., Suite 301, Mooresville, NC 28115
Phone: [phone] Fax: [phone]
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.
From: Jennifer Robertson [mailto:[e-mail]]
Sent: Monday, December 6, 2021 8:36 PM
To: Johnson, Alan <[e-mail]>; David Starkel <[e-mail]>
Cc: Perez, Douglas J <[e-mail]>; Holden Sabato<[e-mail]>
Subject: [External] RE: china grove ind 21-1726
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Alan,
Attached is a typical culvert crossing illustrating burial of the culvert to allow for aquatic life movement. Both
entrance road crossings will be sized in order to allow the culverts to be buried 12" into the stream bed.
BMP 3 is discharging in the middle of the basin. The receiving stream is a perennial stream that flows from off
site. An outlet at the upper end of this basin would reach less than 150 additional feet of stream. Moving the
outlet to the upper end of the basin would create a higher elevation change from the outlet to the stream bed
which may become unstable and erode.
The receiving stream below BMP 4 has two feeder streams that flow into it. Moving the outlet to the upper end
of this basin would be at an elevation 15' higher than the proposed outlet. The higher outlet would be 25'
above the existing stream bed elevation.
I think both streams receive amble storm flows. If we need to we could do a couple rounds of monitoring after
construction was completed so show that base flow had not been affected.
Thank you,
Jennifer L Robertson, President
ATLAS Environmental, Inc.
338 S. Sharon Amity Road #411
Charlotte, NC 28211
[phone] office
[phone] mobile
www.atlasenvi.com
Offices in Asheville and Charlotte
2

ONMENTAL
From: Jennifer Robertson
Sent: Thursday, December 2, 2021 5:10 PM
To: Johnson, Alan <[e-mail]>; David Starkel <[e-mail]>
Cc: Perez, Douglas J <[e-mail]>; Holden Sabato<[e-mail]>
Subject: RE: china grove ind 21-1726
David,
I received the email below from Alan this afternoon for China Grove. I have attached the impact map that was
submitted with the permit application. Is it possible to move the outlets at BMP 3 and 4 to the upstream side of
these ponds? This will allow storm flows to enter more linear footage of the streams. Also, do you have
details for the two stream crossings yet?
Thanks everyone!
Holden,
This one goes off public notice at the end of the month.
Thank you,
Jennifer L Robertson, President
ATLAS Environmental, Inc.
338 S. Sharon Amity Road #411
Charlotte, NC 28211
[phone] office
[phone] mobile
www.atlasenvi.com
Offices in Asheville and Charlotte
From: Johnson, Alan <[e-mail]>
Sent: Thursday, December 2, 2021 4:23 PM
To: Jennifer Robertson <[e-mail]>
Cc: Perez, Douglas J <[e-mail]>
Subject: china grove ind 21-1726
3

Basically straight forward. But why not relocate the outfalls to the upstream end of the
stream feature? Given the cut/grading that is required that shouldn't be problematic (see
examples below). Also, culvert details? A small stream. Public Notice: 12/30 Thanks
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DWR
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PROPOSED
Divklort of Water Resources
Alan D Johnson — Senior Environmental Specialist
NC Dept. of Environment & Natural Resources (NCDENR)
Division of Water Resources - Water Quality Regional Operations
610 East Center Ave., Suite 301, Mooresville, NC 28115
Phone: [phone] Fax: [phone]
4

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.
5

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