20190560 Ver 1_Maintenance Plan rev 2_20190625

Dredging Plan
Bradley Creek Reservoir
Pisgah National Forest, Henderson County, North Carolina
Prepared by C1earWater Environmental Consultants, Inc.
June 18, 2019
In accordance with the terms and conditions of the US Forest Service Special Use Permit, the
Permit Holder, City of Hendersonville (City), is required to comply with established federal and
state laws for the operation and maintenance of the permitted use
The Bradley Creek Reservoir is a concrete dam with an upstream reservoir located within Pisgah
National Forest and is a water source for the City's water treatment facility located in Mills River,
NC. The reservoir was constructed in 1927. The City has an active 2 ear lease with the National
Forest Service to operate the existing water supply reservoir until 2
This plan has been prepared for the proposed dredging and val e mainten ce project to occur in
the summer of 2019.
A. CONTACT INFORMATI
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City of Hendersonville Water Treatmentcility is located at 41
NC 28759. The main phone number for contacting these individua
who work on distribution lines, raw water intake lines wi
Hendersonville Water and Sewer, an enterprise department of the
will include a variety of fieV operations personnel.
Individuals responsible for these field operations personnel are:
• Lee Smith (utilities director) - [phone]
• Andy Brogden (operations manager) - [phone]
• Ricky Levi (WTP manager) — [phone]
Haywood Road, Mills River,
828) 891-7779. Individuals
be employed or contracted by
Citv. Work on transmission lines
B. 2019 MAINTENANCE PROJECT
The project will encompass dredging of excess sediment to be removed from reservoir thus
restoring the water storage capacity behind the dam. This reservoir was last dredged in
approximately 1994 or 1995- A Pre -construction meeting will be held prior to any work between
the City of Hendersonville, C1earWater Environmental, US Forest Service permit administrator
and additional appropriate permitting agencies if needed.
Plastic barriers filled with water, plastic sheeting, and sandbags will be installed to divert the
Bradley Creek to an existing upstream diversion channel as indicated on Figure 4. The bypass
channel is believed to be the original stream bed prior to the construction of the concrete dam. The
bypass channel has been used multiple times in the past when dredging has been performed, (see
the Permit Dredging Impact Plan from 1994 — Attachment B). Upon approval, the bypass channel
entry point will be opened using a medium-sized, long reach excavator.
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Once water is diverted to the bypass channel, a mechanical pump will be used empty the reservoir.
The water will be pumped below the dam. During removal of water from the reservoir, the water
pumped will be sent through a geo-textile filter bag to maintain low levels of turbidity, not to
exceed 10 NTUs (Nephelometric Turbidity Units) from baseline levels. The pumping system will
also include a screen to prevent aquatic life from being harmed.
The intake velocity of the temporary pump shall be less than 1 foot per second. This pump will
also be used to maintain low levels of water in the reservoir during dredging. The pump will
continue to run, as necessary, during dredging operations to keep reservoir dry.
The dredging work will be conducted with the same excavator mentioned above. The excavator
will dredge the reservoir to a depth of approximately 4-8 feet. The excavator will unload the
dredged material into a dump truck using one motion. The dredged material will then be hauled
offsite in a dump truck to an upland farm are400f the US Fore Service boundary.
The upland project boundary will utilize silt minimize sedime off.The City will have an engineer on-site durinatering process to imm ely inspect the
condition of the existing gate valve to oversee maintenance if needed.
Once the project is complete, 50% of incoming flows will be maintained in Bradley Creek
downstream of the project otprint during pond refill to maintain aquatic habitat.
C. AQUATIC WILDLI LOCAT
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The North Carolina Wildlife Resources Commission will be notified 2 weeks prior to dewatering
and dredging project to allow for WRC staff to assist with the aquatic wildlife relocation work.
Durin the dewatering process of the res ,remaining aquatic life will be relocated
immediately and quickly after flows diversion has begun. It is anticipated that the dewatering
process will take approximately four to eight hours to complete the install of the diversion barriers
and pump system to dewater the reservoir. During this time, two City staff, two C1earWater staff,
and any additional WRC staff will be actively catching aquatic life in the 290 feet of dewatered
stream, using nets and uckets with water.
• With the excepts ed below, animals will be moved via buckets with water into
downstream section radley Creek below the confluence of the secondary channel.
• If any large salamanders such as, hellbenders or mudpuppies are found, they should be
taken via bucket far downstream, near the confluence with the South Mills River.
• Pond -dwelling turtles and pond dwelling salamanders other than hellbenders or
mudpuppies should be moved to a large, slow pool that has a pond -like character.
Once the water is drained and the aquatic life is safely removed and relocated the dredging
operation will begin.
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After all flows are redirected back into the main channel and reservoir, the diversion channel
should be quickly surveyed, and any stranded animals relocated downstream into the flowing
channel.
D. LANDSCAPE AND EROSION CONTROL
The Permit Holder or their Contractor shall take necessary measures to prevent and control soil
erosion within the right-of-way and on adjacent lands that might be affected by construction,
operation, or maintenance of the use; and shall revegetate, and keep revegetating all areas of soil
made bare by these activities, and shall constrain eroded material within the construction limits.
To meet this objective the Permit Holder or Contractor 'll accomplish the following provisions
during construction.
I . Establish and maintain a vegetative cove earth cut and fill banks on all mixed earth
and rock banks which have enough so' o construction.
2. Seeding as construction progresses usi ild seed mix. A temporary cover crop will be
established if there is a conflict in plan seaso permanent cover crop will be
established at the first approved time of planting.,
3. Completing all seeding and mulching within 30 days of constructiontuing the seeding
season, unless drought conditions prevail.
4. Using a seed mixture adapted to soil, climate, and season. Mulching with pine straw.
5. Seed bare soils within 100 feet riparian area the same day as completion of soil
disturbance.
E. VEGETATI LEARING
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The Permit Holder, or their contractor and subcontractors will conform to the following Clearing
Plan: -44%7
1. aximum cle g and grubbing limits are to be set at 5 feet outside actual construction
lin xcept that cutting of hazard trees outside these limits may be done with approval.
Construction machinery is to be contained within the clearing limits. However, no clearing
shall be done outside the south right-of-way limits.
2. If during the clearing phase of construction endangered, threatened, and sensitive species
are encountered, V st Supervisor will be notified before clearing proceeds.
F. CULTURAL RESOURCES
If during construction or maintenance activities archaeological sites are discovered, activities will
be immediately suspended, and the US Forest Service Supervisor will be notified. Prior to
resuming activities, each site will be evaluated by a professional archaeologist using the National
Register of Historic Places, criteria of significance, using known data.
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If archaeological site testing is required to evaluate significance, and the construction project
cannot be moved so that no adverse effect will occur to the cultural resource, the Permit Holder
will notify the US Forest Service Supervisor for consultation before construction begins or
resumes.
All activities requiring modifications to National Register listed or eligible sites will be
coordinated by the Forest Service and the Advisory Council on Historic Places and the State
Historic Preservation Officer, whether under easement or not.
Testing or mitigating National Register sites will require a 1906 Antiquities Act permit, authorized
by the Regional Forester and the Smithsonian Institution. The permit shall be sought prior to any
investigations of this order. Am
A report describing the sites found, their significance, and the judgments used to arrive at
significant determinations, will be prepared by the public road agency's professional archaeologist
and submitted to the US Forest Service Supervisor for review.
A "site" is defined as more than twc
G. FIRE PROTECTION
older th 0 years.
During the period of construction, the Permit Holder shall both independently and in cooperation
with the Forest Service, do everything that is reasonable and practical to prevent and suppress
forest fires on the project area and in its immediate vicinity. All contracts and subcontracts shall
include provisions requiring contractors, subcontractors, and their respective employees to do
likewise. The Permit Holder, their contractors, and subcontractors will conform to, but not be
limite*egardles
following Fire Plan: %62%
1mmedia epe ent or cooperative action to control and extinguish any fire,
s of caus , within the easement area and its vicinity.
2. Provide adequate spark arrestors acceptable to the US Forest Service Supervisor on all
steam and internal combustion engines, including tractors, trucks power rollers, power
shovels, and chain saws. The use of welding equipment, cutting torches, and similar
flammable equipment must be done in an area cleared of all vegetation, leaves and debris.
Power saws shall not be refueled while hot and shall be refueled in a roadway or other
cleared area. Ir
3. When the Forest Se ce advises the State that local fire weather conditions are becoming
critical, the Permit Holder shall always keep gasoline chain saws, a shovel, and take
precautionary measures requested by the Forest Service.
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