20211773 Ver 1_More Information Received_20220210

Strickland, Bev
From: Charles Johnson <[e-mail]>
Sent: Thursday, February 10, 2022 8:50 AM
To: Cohn, Colleen M
Subject: [External] RE: Lake Michie Dam Warning Barrier DWR#20211773
Attachments: LAKE MICHIE WARNING BARRIER PLAN.pdf
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Ms. Cohn,
Please see responses below in [red] and let me know if you have any additional questions or clarifications. I have also
attached an updated site plan reflecting additional clarification regarding the impact areas.
Thanks,
Charles Johnson, PE, SE
Associate / Schnabel Engineering South, P.C.
Schnabel Engineering
T 336.274.9456 / C 336.407.1961
11 A Oak Branch Drive
Greensboro, NC 27407
schnabel-eng.com
1
Build Better. Together.
From: Cohn, Colleen M <[e-mail]>
Sent: Friday, February 4, 2022 1:44 PM
To: Charles Johnson <[e-mail]>
Subject: Lake Michie Dam Warning Barrier DWR#20211773
Good afternoon,
I am reviewing the application for the above referenced project, and in order to complete the review, some additional
information is required:
1) The site maps included do not show Zones 1 and 2 of the Riparian Buffer. The site maps do not show the
location and dimensions of the proposed buffer disturbance. The Shoreline Anchorage block appears larger than
the 9'x9' block shown on sheet 04 of 07 based on the scale used on the site map. Please provide updated maps.
[15 A NCAC 02B .0611(b)(1)(F)] [Buffer Zones 1 and 2 have been added to the site map. The area indicated on
the maps for impact is larger than the footprint of the concrete blocks because construction will require
excavation at stable slopes to permit formwork installation and a general work area. Dimensions for the impacts
in each Buffer Zone have been added to the attached site plan.]
2) Please provide more information on how these anchor blocks are to be installed. Sheet 03 of 07 Titled "Warning
Barrier Plan" states that "Concrete is anticipated to be pumped across reservoir from Dam Crest". [15A NCAC
02B .0611(b)(3)] [There is no access road to the proposed anchor on the north bank, so we anticipate the
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contractor will deliver concrete to the site in a concrete pump truck from the access road off of Cassam Rd. that
leads to the embankment crest at the south anchor. The contractor will have a crew to set up a floating pump
line across the lake in the general area of the proposed warning barrier and pump the concrete in an enclosed
line across the lake. Concrete laborers will be stationed at the north anchor to direct the pump line at point of
placement and finish the concrete. A contractor could propose to hand mix the concrete onsite, at the anchor
or bring the concrete in buckets by boat, but we do not anticipate these other methods will be more protective
of the buffer area.]
3) The site map shows temporary silt fences that appear to be in Zone 1. Temporary sediment and erosion control
devices in Zone 1 that are to control impacts associated with work in the Table of Uses require are Allowable
with Authorization. Please provide a square footage for the amount of disturbance to the buffer by the
proposed temporary sediment and erosion control devices. [15A NCAC 02B .0714(11)(ff)] [The maximum extent
of disturbance (square footage) within each buffer zone has been added to the attached site plan; proposed
temporary sediment and erosion control devices were previously provided in the drawings submitted with the
Buffer Authorization Form.]
Thank you,
Colleen Cohn
Environmental Specialist II
North Carolina Department of Environmental Quality
Division of Water Resources
Raleigh Regional Office
380o Barrett Drive
Raleigh, NC 27609
Office: 919-791-4258
E-mail correspondence to and from this address may be subject to the
North Carolina Public Records Law and may be disclosed to third parties.
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• NOTES:
1. EXISTING GROUND CONTO RS ARE BASED ON BATHYMETRIC SURVEY DA A BY TI COASTAL SERVICE, INC. DATED MARCH 26,
2. ALL SURVEY DATA SHOWN UTILIZES THE NORTH CAROLINA VRS NETWORK FO PS K CORRECTIONS AND IS TIED TO TH
HORIZONTAL DATUM OF NAD83 (2011) - NC STATE PLANE (ZONE 3200), WITH A TI ATUM OF NATIONAL GEODETIC VERTICA,
DATUM OF 1929 (NGVD 29).
3. BACKGROUND IMAGERY PROVIDED BY MICROSOFT CORPORATION, MAXAR C , DISTRIBUTION AIRBUS DS, 2021.
4. IF CONTRACTOR PLANS TO USE ACCESS FROM CASSAM ROAD, CONTRACTOR HALL COORDINATE / ESS VV H PERSONNEL
FROM THE CITY POLICE FIRING RANGE, WHICH IS LOCATED BETWEEN THE DAM AND CASSAM ROA --r
5. IF CONTRACTOR PLANS TO USE•/�CCESS FROM THE LAKE MICHIE BOATL'AUNCH, SHO N DRAG G-01 AND LOCATED AT 2802
BAHAMA ROAD, BAHAMA, NC 2750 CONTRACTOR SHALL COORDINATE WITH CITY OF DU AM PARKS AND RECREATION
DEPARTMENT FOR ACCESS
5. LAKE MICHIE RESERVOIR IS A PUBLIC WATER SUPPLY WITH AN INTAKE IN THE RESERVOIR. CONTRACTOR SHALL ENSURE THAT
ill THE RESERVOIR AND INTAKE ARE PROTECTED FROM POLLUTION OR DAMAGE AS A FtSULT OF THE ACTIVITIES ASSOCIATED WI
THE INSTALLATION, USE, AND REMOVAL OF ALL PROJECT CONSTRUCTION EQUIRI�VIENT, MATE IALS, AND PROCESSES. PROTEC
60' 120' LAKE MICHIE RESERVOIR FROM SPILLS, EQUIPMENT LEAKS, AND POLLUTION OF R ERVOIRT NO GASOLINE -POWERED BOATS OR
EQUIPMENT ARE PERMITTED ON THE LAKE. INSPEC1 EQUIPMENT FOR LEAKS BEF EACF�,}JSE, PROVIDE CONTAINMENT AND 1
SPILL KITS FOR ANY POTENTIAL POLLUTANTS, AND REPORT ANY SPILLS OR C'NTAMI ATION OF LAKE TO CITY IMMEDIATELY.
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CREST AS NO ACCESS IS AVAILABLE FROM
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ALTERNATE CONCRETE PLACEMENT
PLANS ARE SUBJECT TO APPROVAL BY
OWNER AND ENGINEER.
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NEUSE RIVER RIPARIAN
BUFFER ZONE 1
IMPACT 900 SF
NEUSE RIVER RIPARIAN
BUFFER ZONE 2
IMPACT 400 SF
LIMITS OF DISTURBANCE,
INSTALL SILT FENCE,
CLEAR TREES WITHIN 10
FEET OF ANCHOR BLOCK
LIMITS AND WITHIN 20-FT
MAX WIDTH PATH TO
ANCHOR FROM ROAD;
REMOVE ALL LIMBS,
TRUNKS, AND STUMPS;
AND PERMANENT SEED
DISTURBED AREA AFTER
BACKFILLING AROUND
ANCHOR
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PROJECT: 19C21037.00
DATE: OCTOBER 2021
DRAWING NO.
G-03
SHEET
03 OF 07