20190104 Ver 1_Geotech Recommendation for B-4916_20190304

Carpenter,Kristi
From: Ward, Garcy
Sent: Monday, March 04, 2019 11:56 AM
To: Carpenter,Kristi
Subject: FW: [External] RE: RE: Geotech Recommendation for
B-4916
Attachments: Revised 2 Wetland Impact Summary Sheet.pdf
Kristi Lynn,
This is for 20190104. Thanks.
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From: Rivenbark, Chris
Sent: Monday, March 04, 2019 8:19 AM
To: Ward, Garcy <[e-mail]>; Barnes, Kyle W CIV USARMY CESAW (US)
<[e-mail]>
Cc: Cashin, Gordon E <[e-mail]>
Subject: RE: [External] RE: RE: Geotech Recommendation for B-4916
Garcy,
The revised impact summary sheet is attached. Geotech has clarified that they do not
feel that undercut will be needed for the temporary detour. Therefore the excavation in
wetlands previously shown for the temporary detour will be changed to temporary fill
with geotextile fabric placed under the temporary fill. After the temporary detour is
removed, those areas will be regraded and replanted. We will provide revised permit
drawings as soon as possible.
Kyle,
Will you need to reissue or can this be handled via email? We'll contact DMS to ask
them to void the acceptance letter they issued for the previously needed impacts.
Please let us know if you have any questions.
Chris �ivenbark
NC�C7T� Environrnental Analysis Unit
(919) 707�6152
From: Rivenbark, Chris
Sent: Friday, March 1, 2019 10:39 AM
To: Ward, Garcy <�arcy.._wa_rd_(�_n�d_e_n_r.�crv>
..
Cc: Cashin, Gordon E <��a_s_h.%n(c�_n�dcrt.:.�ca.v>
Subject: FW: [External] RE: RE: Geotech Recommendation for B-4916

Garcy,
Can you call me to discuss? Mainly #1
Chris �ivenbark
NC�C7T� Environrnental Analysis Unit
(919) 707�6152
From: Leah Young <ILeah.._Ycr_u_n�(�_kc.%.._�ca.rn�>
Sent: Friday, March 1, 2019 8:12 AM
To: Bryan Hough <I�_r.�an.:ll:.�_ca.u�h_..C,�_kci..�ca.m�>
Cc: Peterson, Tierre R<tr.peterscr_n_..C,�_n_�d_crt:.�crv>; Rivenbark, Chris
<crivenk�arkC�_n�dca.t...�ca.v>; Fischer, Kevin <wkfischerC�_n�dca.t...�ca.v>; Cashin, Gordon E
....................................................� _ . ...............................................,,,�. _ .
<��a_s_h.%n(c�_n�dcrt.:.�ca.v>; Bowles, Jacquelyn K <jkk�crwles(c�ncdcrt.�crv>
Subject: [External] RE: RE: Geotech Recommendation for B-4916
.
(1) Will the riprap under the detour be removed when the detour is removed, and
then backfilled with soil?
T�h�r� i5 c� per55il�ility thc�t th� c�r�c� �rill ncrt I�� �unc��r��ut, thcr�u�h �r� c�r� �c��untin�
it c�5 c� p�rrrr�c�n�nt irrr�pc��t c�nc� in�l�uc��c� rrr�iti�c�ticrno If �unc��r��ut i5 ncrt n��c��c�,
th� riprc�p �rill I�� r�rrr�crv�c� c�nc� th� c�r�c� r�.�rc�c��c� tcr ��ci5tin� �c�ntcr�ur5 c�nc�
r�plc�nt�r�/rn�crnitcrr�r�o If thi5 i5 th� �c�5� �r� �rcr�ulr� r�r��u�5t c� p�rrn�it rn�crr�ifi�c�ticrn
tcr �Ic�irrr� th� it c�5 t�rrr�perrc�ry irrr�pc��t, c�nc� �r�c�it th� rrr�iti�c�ticrn I�c��k tcr C��IISo
(2) He is having trouble lining up the Details with where they are on the plan sheet.
The station #s are not clearly indicated on the plans, and there isn't an arrow to
indicate what they refer too. I see his point. I am unclear myself on what detail
1 and 2 are referring to on Sheet 3. Th� ditch d�tails shovv th� station rang�s
und�r th� d�tail and th� ditch lin� vvork is shovvn in th� plan vi�vv. Th� major
roadvvay tick marks ar� lab�l�d on th� plans abov� th� plan vi�vv. Ditch D�tail 3
is shovvn on both th� d�tour and mainlin� plan sh��ts as it is a p�rman�nt
impact that vvill r�main in plac� aft�r th� vvork is compl�t�d. W� can add th�
ditch lab�ls back onto th� plans if th� D�partm�nt wants.
(3) He also wanted to know if the channel change (detail 3) can stop short of the
wetland boundary. This would eliminate a bit of excavation in wetlands and
allow sheet flow across the wetland to the stream channel. D�tail 3 is r�placing
an �xisting drainag� f�atur� that curr�ntly flows und�r th� �xisting bridg�, but
vvill b� fill�d by both th� d�tour and th� p�rman�nt fill slop�s. It vvas pr�viously
d�t�rmin�d that this is not a Jurisdictional Str�am (th�r�for� not count�d in th�
str�am impacts) but it is an activ�ly flovving chann�l. To r�duc� th� amount of
impacts, it was d�t�rmin�d that th� chann�l should b� p�rman�ntly r�locat�d
during th� d�tour phas�. Th� chann�l chang� must go through th� vv�tlands to
drain out to Ci.uioccosin Svvamp.
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