20170359 Ver 2_Email_20191011

Strickland, Bev
From: Arrance, Keven <[e-mail]>
Sent: Friday, October 11, 2019 3:47 PM
To: Fuemmeler, Amanda J CIV (US); Homewood, Sue; Moore, Andrew W; Park, Kelli A;
Leslie, Andrea J
Cc: [e-mail]; Zach Platek; Schueler, Tim; McSwain, Joel
Subject: [External] Grandfather Golf and Country Club - bridge and pier removal
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Thank you for meeting on-site and discussing the work to be done at and around the GGCC lake. GGCC understands the
Corps, DWR, and WRC have no objection to GGCC moving forward at this time with removal of the superstructure of
seven pedestrian bridges and of the driven pilings associated therewith from within the project area, including possible
work during the October 15 — December 31 timeframe, so long as all work is performed from land and we monitor
turbidity in the lake upstream and downstream of each bridge removal location. No work associated with bridge
removal shall be performed from in the water. Should an increase in turbidity be observed as a result of the bridge
removal activities, we understand that the work shall stop upon discovery of the increased turbidity. Work may resume
once a turbidity control measure is implemented.
GGCC proposes the following turbidity control measure to be implemented if bridge and pier removal results in
increased turbidity. The proposed measure consists of a short -span turbidity curtain (TC) that is anchored to land on
either end of the particular bridge being removed and the curtain is then lowered into the water and allowed to rest on
the lakebed. The TC will be deployed in such a position as to capture and retain suspended sediments close to the
source of the sediment plume to minimize the areal extent of increased turbidity in the lake. It is our understanding is
that this type of TC can be deployed from land without any equipment in the water.
If GGCC's understanding is incorrect or the proposed turbidity control measure is not acceptable, please let me know
right away. If you have any questions or concerns, please feel free to contact me at [e-mail].
Thank you, and have a great weekend!
Ms. Keven Arrance
Senior Principal Scientist I Hazen and Sawyer
4011 WestChase Blvd., Suite 500, Raleigh, NC 27607
919 863-9350 (direct); 919 522-4269 (mobile)
karrance(a�hazenandsawyer.com I hazenandsawyer.com