20151027 Ver 1_More Info Received_20151029

From: Jess Gardner <[e-mail]>
Sent: Thursday, October 29, 2015 12:11 PM
To: Price, Zan (George)
Subject: RE: Additional Information Request - Lake Tomahawk Dredging - DWR 2015-1027
Attachments: mk-25septl5-narrative.doc
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See attached narrative we shared with Land Quality section. Let me know if this addresses your concerns or if you would
like to discuss in more detail.
Thanks,
Jesse Gardner
From: Price, Zan (George) [mailto:[e-mail]]
Sent: Wednesday, October 28, 2015 4:48 PM
To: Jess Gardner <[e-mail]>
Subject: Additional Information Request - Lake Tomahawk Dredging - DWR 2015-1027
The Division of Water Resources (DWR) has performed a review of a 401 Water Quality Certification application received
on October 2, 2015 for the above referenced project. The DWR has determined that your application is incomplete and
cannot be processed. The application is on -hold until the following information is received:
Please provide a narrative on how downstream turbidity levels will be monitored while the lake valve is opened
to drain the lake and throughout the duration of the project. The turbidity in the receiving stream shall not
exceed 50 Nephelometric Turbidity Units (NTU [15A NCAC 02B .0211 (21)]
Contact me if you have any questions or concerns.
Regards,
Zan Price, P.E.
Assistant Regional Supervisor —Asheville Regional Office
Water Quality Regional Operations Section
NCDEQ — Division of Water Resources
828 296 4500 office
828 231 9634 mobile
email:. zan.crice(a),ncdenir.aov
2090 U.S. Hwy. 70
Swannanoa, N.C. 28778
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Lake Tomahawk Dreduinu Proiect
Proiect Narrative
Lake Tomahawk is located in the Town of Black Mountain and is a major asset to the Town's
Parks and Recreation Department. The park located at Lake Tomahawk contains many other
Town amenities such as the community pool, tennis courts, playgrounds, greenway and walking
paths, and community gardens. The Black Mountain community places a strong emphasis on
quality recreation and park services and Lake Tomahawk plays a key role in fulfilling this need.
Over years of upstream development and natural erosion, the Lake has gradually collected a
considerable amount of sediment near and around its forebay. The objective of this project is to
restore the original design depth of the Lake and improve the overall water quality and
recreational opportunities provided by Lake Tomahawk.
The proposed project is planned to occur during the winter months of this year so that minimal
impacts occur to the recreating public. The Town plans to begin draining the lake in mid-
December and will plan to have the lake completely drained for approximately 30-45 days before
construction begins. This time frame allows the sediment material to dewater to the point where
equipment can enter lake bed to begin the removal process. A temporary pool of lake water will
remain at the lower 1/3 of the lake adjacent to the outlet to provide TSS/Turbidity control during
construction activities. The pool of water will be sized so that if there is any TSS activated during
construction activities on the inlet side of the lake, it will have ample opportunities to settle out
prior to discharge back into Tomahawk Branch. The town staff will be onsite during the entire
construction process and will monitor turbidity of the outflowing water from the lake to ensure
compliance with this requirement.
The sediment will be stockpiled at edge of lake footprint for it to have additional opportunity to
dewater prior to it being loaded and hauled to the disposal site, located off North Fork Rd just
north of Lake Tomahawk. The project is anticipating a removal of approximately 5,000 cubic
yards of material. Upon completion of sediment removal, the lake will be allowed to fill back up,
all disturbed areas outside the lake footprint and the entire disposal area will be seeded and
vegetation re-established. All pathways will be reconstructed to original conditions. Once
vegetation is established and approved by engineer, all erosion control measures will be removed
and project will be closed out.
Mailing Address: P.O. Box 5432, Asheville, NC 28813
168 Patton Ave Asheville, NC 28801 52 Walnut Street Suite 9, Waynesville, NC 28786
Phone [phone] Fax [phone] Phone: [phone] Fax: [phone]