20150124 Ver 2_Comments on Water Quality Monitoring Plan_20181220

n
�@wnWy�
NORTH CAROLINA
ROY COOPER Environmental Quality
Governor
MICHAEL S. REGAN
Secretary
LINDA CULPEPPER
Interim Director
December 20, 2018
DWR#2015-0124 v2
Chatham County
Andrew McMahan,President
McMahan Hydroelectric,LLC
105 Durham Eubanks Rd.
Pittsboro,North Carolina 27312
Subject: Comments on Bynum's Water Quality Monitoring Plan
Bynum Hydro Project FERC P-4093
Dear Mr.McMahan:
The Division of Water Resources(Division)recently reviewed the proposed Water Quality Monitoring
Plan and FERC's Environmental Assessment(EA)for the Bynum Hydroelectric project.The comments
resulting from this review are listed on the next page.Please modify the Water Quality Monitoring Plan
(as necessary)and provide a response within 30 days of this letter. Once we have an approvable plan,we
will issue the required Public Notice for this application.
Please contact Chonticha McDaniel at(919)707-3634 or chonticha.mcdanieK0cdenngov if you have
any questions or concerns regarding this matter.
Sincerely,
Karen Higgins, Supe "
401 &Buffer Permitting Branch
cc: Fred Tarver—NC Department of Environmental Quality(via email)
DWR 401 &Buffer Permitting Branch File
D q�
North Carolina Department of Environmental Quality I Division of Water Resources
512 North Salisbury Street 11617 Mail Service Center I Raleigh,North Carolina 27699-1617
919.707.9000

Page 2 of 2
DWR#2015-0124 V2
Comments on the Water Quality Monitoring Plan
1. We recommend changing the monitoring location No.1 from the project reservoir(upstream of dam)to
the secondary bypass reach instead(as shown in the picture below). We believe that collecting
DO/Temp data from this location will be more beneficial and help us to determine impacts from the
powerhouse operation since the reach has direct connection and is joined by the tailrace water.
..n
III S d
Eastern Riverbank
11 �Y Powerhouse
xll cY
jll mA
Intake Canal xx
Haw River a
9 3 a�
P
11 Qh
Haw River l
u
11
so:: 11 Z
Haw River
A
Proposed Monitoring Locations A
�1 Bypass Reach 1 11 A O
2 Bypass Reach 1 11 Y N
11 /
Q3 Powerhouse Tailrace 11 Y
2. Please modify the Sampling Procedure to specify that the field sampling for all 3 locations will be
conducted on the same day and during the time when the powerhouse is in operation.
3. Please modify the frequency of monitoring from monthly to weekly. However, the weekly sampling is
only required when the powerhouse is in operation during that one-week period.
1-1 A j�L Q5
North Carolina Department of Environmental Quality I Division of Water Resources
512 North Salisbury Street 11617 Mail Service Center I Raleigh,North Carolina 27699-1617
919.707.9000