20160804 Ver 2_Pre-Filing Meeting Request_20200922

ID#* 20160804
Version* 2
Regional Office* Wilmington Regional Office - [phone]
Reviewer List* Robb Mairs
Pre -Filing Meeting Request submitted 9/22/2020
Contact Name * Emily Hughes
Contact Email Address* [e-mail]
Project Name* Eagle Island Cell 1 Improvements, Spillways 1-3
Project Owner* USACE Wilmington District
Project County* Brunswick
Owner Address: Street Address
Address Line 2
aty State / Province / Region
Fbstal / Zip Code Country
Is this a transportation project? * r Yes r No
Type(s) of approval sought from the DWR:
* 401 Water Quality Certification - r- 401 Water Quality Certification -
Regular Express
* Individual Permit F Modification
F- Shoreline Stabilization
Does this project have an existing project ID#?*
r Yes r No
Please list all existing project ID's associated with this projects.*
DWR # 16-0804
Do you know the name of the staff member you would like to request a meeting with?
Robb Mairs
Please give a brief project description below.*

The FY20 Improvements consists of replacing the three spillways within
Cell 1, constructing interior step-ins on both the east and west sides, and
constructing toe berms on the exterior of Cell 1, on both the east and west
sides.
Spillway 1 will be relocated to the west side of Cell 1 (its original location).
Spillways 1, 2, and 3 will be removed and replaced with 30-inch diameter
high -density polyethylene (HDPE) pipes through the dike embankment.
Pipe bedding will be used underneath and also as backfill around the
majority of the new pipe length. The pipe bedding will consist of a silty sand
(SM) or clayey sand (SC) with greater than 25% fine material passing the
No. 200 sieve (P200 > 25%). A filter diaphragm and horizontal sand drain
will be constructed on the portion of the spillway pipe near where it exits.
The filter diaphragm and horizontal sand drain will consist of material
meeting the requirements of ASTM C33 fine aggregate material. The
configuration of the filter diaphragm and horizontal sand drain is based on
the recommendations found in Chapter 6 of the Federal Emergency
Management Agency Technical Manual: Conduits through Embankment
Dams, dated September 2005. The new 30-inch diameter HDPE pipes will
be connected to the existing HDPE outfall pipe outside the dike
embankment draining to the Brunswick River. The timber cribbing support
will be left in place.
The existing walkways with concrete pads, spillway risers with concrete
pads, spillway grating and spillway anchors are to be removed and
relocated at the toe of the new dike embankment step-in. Two new 4-foot
riser sections are to be added to Spillways 1, 2 and 3, as well as a ladder
installed on the new4-foot spillway riser sections. The existing pipes at
Spillways 1, 2 and 3 will be removed and replaced with new30-inch
diameter high -density polyethylene (HDPE) pipes. The existing French
drains at the spillways are to be removed.
All sediment and erosion control measures will be installed prior to or in
conjunction with the start of construction and will be maintained throughout
the period of construction. Sediment from the work site will be contained on
site and not allowed to enter adjacent regulated wetlands or waters.
Temporary and permanent sediment and erosion control measures will be
provided to stabilize all disturbed areas. Sediment and erosion control
measures will include installation of temporary silt fence, and seeding and
mulching.
Please give a couple of dates you are available for a meeting.
9/25/2020
Please attach the documentation you would like to have the meeting about.
pdr only
By digitally signing below, I certify that I have read and understood that per the Federal Clean Water Act Section
401 Certification Rule the following statements:
• This form completes the requirement of the Pre -Filing Meeting Request in the Clean Water Act Section 401 Certification
Rule.
• I understand by signing this form that I cannot submit my application until 30 calendar days after this pre -filing
meeting request.
• I also understand that DWR is not required to respond or grant the meeting request.
Your project's thirty -day clock started upon receipt of this application. You will receive notification regarding meeting location
and time if a meeting is necessary. You will receive notification when the thirty -day clock has expired, and you can submit an

application.
Signature
wer, I - l01-a
Submittal Date 9/22/2020
Reviewer Meeting Request Decision
Is a meeting Required?* r Yes r No