20171627 Ver 1_More Info Received_20180103

Johnson, Alan
From:Karl, Jarrod <[e-mail]>
Sent:Wednesday, January 03, 2018 1:55 PM
To:Johnson, Alan
Subject:RE: \[External\] RE: doby creek
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Thanks Alan.

Jarrod Karl
Hazen and Sawyer
704 941-6994

From: Johnson, Alan \[mailto:[e-mail]\]
Sent: Wednesday, January 03, 2018 1:50 PM
To: Karl, Jarrod <[e-mail]>
Subject: RE: \[External\] RE: doby creek

I think David isn’t fond of fords for stream crossing. I think…

I prefer just well embedded riprap. That articulated concrete mat requires a bit more work.

But I am good to go.

Thanks

From: Karl, Jarrod \[mailto:[e-mail]\]
Sent: Wednesday, January 03, 2018 1:05 PM
To: Johnson, Alan <[e-mail]>
Subject: \[External\] RE: doby creek

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[e-mail].

Hey Alan,

Happy New Year! Sorry about the small notes. I tried to include some additional information to help you find everything
easier, but I guess it got a bit cramped! See answers below.

Jarrod Karl
Hazen and Sawyer
704 941-6994

From: Johnson, Alan \[mailto:[e-mail]\]
Sent: Wednesday, January 03, 2018 11:37 AM
To: Karl, Jarrod <[e-mail]>
Subject: doby creek
1

Easier to ask questions.

1) You have permanent impact on stream… about 80 ft total and state “fill”. Is that a culvert or rip rap
stabilization. The permanent impacts to the stream are all from permanent ford crossings that will be
constructed of either articulated concrete or rip rap. The contractor may choose to install either so I just
included “fill” in the table. Charlotte Water prefers the articulated concrete mats, but some contractors are not
comfortable installing them and may install rip rap. All the other stream impacts are temporary and I assume
that means the stream will be return back to existing elevation.. AND where the line is abandon, the stream is
returned to natural, if the pipe is removed. Yes. The stream will be returned back to existing elevation at all
temporary impact locations which include temporary stream crossings (culvert) and locations where the pipe
will be removed and replaced. In these replacement areas the existing aerials will be removed and replaced with
a new pipe buried below the stream invert. A temporary cofferdam (temp fill) will be placed in the stream to
allow dewatering of the construction area and the stream will be returned to pre-existing elevation So,
temporary excavation and fills.

2) Temporary wetland impacts, does this mean that after impact the wetland will also be planted back to existing
elevation, vegetation etc…. Yes. The wetlands will be returned to existing elevations and seeded with a native
wetland seed mix. Where they’re excavating to install the sewer, the contractor is instructed on the construction
drawings to remove the topsoil and stockpile it separately, then replace it as the top layer before replanting.
There are also several areas where the existing pipe will be abandoned where impacts will be limited to machine
access to remove manholes and plug the old system. Impacts in those areas will be minimal and may not require
revegetation.

Finally, you show the proposed and existing. What section of the existing line will be abandon? I think there a
connections to the proposed line from the existing line that “won’t be abandon” I would think. Figure
3a. Existing line at wetland W1 ties into proposed line. At the top of the page, proposed line ties in with
existing. So the only abandoned line will be the one parallel to Doby Creek? Figure 3d. the existing line coming
in from the right at S8 and S9 to the proposed line. Is that abandoned or just a tie in? In your first example,
Figure 3a. The existing 8” SS will remain and not be replaced. It will tie into the new sewer which is being moved
away from the creek approximately 10 feet. So, the only impacts to Wetland W1 (Temp Impact No. W3) is from
construction access. In your second example, Figure 3d. The existing line will be replaced in-kind (Temp Impact
No. S9) (aerial crossing will be buried below stream) and a permanent stream ford crossing will be installed
(Perm Impact No. S8).

There are so many different types of work, we didn’t think including all the project details on the figures would
be helpful at 200 scale. The construction drawings have all the details and are the best place to see the type of
work proposed and locations of sewer lines, easements, etc. The impact tables included in the Additional
Information section reference plan sheets, which should help you find everything on the drawings.

It seems most impacts are associated with the old line, which I assume is for removal of the line???? Most of the
wetland impacts are associated with replacement of the old line immediately adjacent (within 10-20 feet) or as a
realignment where the existing sewer will be plugged and abandoned in place (not removed). Most stream crossings and
a two wetland crossings (Wetlands W13 and W14) will be done in-kind where the existing pipe will be removed and
replaced in the same trench. Generally, all wetlands and streams within the limits of construction (LOC) were included as
impacts. The contractor may be able to further avoid and minimize during construction if they don’t need to use the
entire LOC.

I know there’s a lot going on in these plans, so hope this helps. If you want to discuss additional specifics, let me know.
I’m happy to go over each of the impacts over the phone or in person as well.

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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]

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