20110581 Ver 2_Modifications_20120625

DEPARTMENT OF THE ARMY
WILMINGTON DISTRICT CORPS OF ENGINEERS
69 DARLINGTON AVENUE
WILMINGTON NORTH CAROLINA 28403 1343
REPLY TO
ATTENTION OF June 21, 2012
Environmental Resources Section
Mr Ian McMillan
North Carolina Division of Water Quality
1650 Mail Service Center
Raleigh, North Carolina 27699 1650
Dear Mr McMillan
►► -0SB► v 2
D
EUIN2 2012
DENR WATLN f- ITY
The Town of Cary currently has permission to construct a stream restoration project on the
White Oak stream in accordance with the General Water Certification No 3689 (Division of
Water Quality Project No 11 058 1) Since the time of the original application for the General
Water Certification No 3689 the stream upstream of the project area has headcut well beyond
the original project limits An additional 105 linear feet of stream will be added to the current
restoration protect in order to address the additional erosion and bed lowering caused by this
headcut It is necessary to address this headcuttmg of the stream to ensure the success and
stability of the stream restoration project Accordingly, modification of the Protect No 11 0581
is requested The additional stream area to be restored is depicted in the drawings enclosed with
this letter Also, a check for the amount of $240 is enclosed for the modification fee
Thank you for your attention to this matter Should you have any questions, please contact
Ms Teresa Bullard Environmental Resources Section, at [phone]
Enclosures
r
Chief, Environmental Resources Section

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PROFILE C/L SITES STREAM RELOCATION
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PROFILE C/L SITE 4 STREAM RELOCATION EL. 365.33 EL. 366.74 EL. 367.20 PVI 10+30.58
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PLATE
NUMBER
P -11
SHEET 13 OF 64

5
D
3
2
A I B I C
TYPICAL DETAIL
COIR FIBER MATTING
PLAN VIEW
BRUSH MATTRESS - THIS METHOD USES HARDWOOD
BRUSH LAYERED ALONG A STREAMBANK AS A
MATTRESS AND ANCHORED IN PLACE WITH GRID OF
STAKES AND WIRE. THE TOE BELOW THE WATERLINE
1 IS ANCHORED BY ROCK.
N.T.S.
=S (3' LENGTH)
12 GAUGE NON- GALVANIZED WIRE
WIRE SECURED TO STAKES
ANCHES MIN. PER 3'
:HES OF 1' DIA, OR LESS
STAKE
EXCAVA L-
AT TOE OF SLOPE
1.5' WIDTH x 1.0' DEPTH
(BACKFILL WITH SOIL)
I
COIR FIBER MATTING
E
�n n A irnr
SECTION A —A
N.T.S.
COIR FIBER MATTING TO
EXTEND FROM TOE OF
STREAM TO 2'BEYOND
TOP OF CUT SLOPE
SECTION B —B
N.T.S.
TYPICAL DETAIL
BRUSH MATTRESS
N.T.S.
STAKES
3RUSH MATTRESS:
i. uu i or-,ANCHES OF SPECIFIED TYPE AT 45
DEGREE ANGLE LONG ENOUGH TO COVER BANKS
PLUS I' DEEP INTO TRENCH AND I' ABOVE TOP
OF BANK.
2. DIG TRENCH AT BASE OF BANK, RESERVING SOIL
FOR BACKFILL
3. LAY FIRST LAYER OF CUTTINGS PERPENDICULAR
TO SLOPE, MAKING SURE TO PUSH CUT END
INTO TRENCH
4.LAY SECOND LAYER AT 45 DEGREES (UPSTREAM)
5. LAY THIRD LAYER AT 45 DEGREE (DOWNSTREAM
F I G
J
J
L._
Y
Z
Q
A
BACKFILL °°
Y2" REBAR ROD -
INSTALL 2' FROM
END OF LOG
BOULDERS TO BE u FOOTER CUT NOTCH
BURIED AND PLACED J LOG LENGTH 9"
AT END OF LOGS DEPTH 18"
Y FLOW
z
a
M
BURY FOOTER LOG INTO POOL
CHANNEL BED, SECURE LOGS
TOGETHER BY PINNING EACH END
WITH Y2" REBAR.
EXISTING POOL
FLOW
BACKFILL, TYP.
*57 STONE,AND /OR-
CLASS ''A'' STONE T`
EXCAVATE TRENCH
FOR LOG SILL
CONSTRUCTION
PLAN VIEW
HEADE
LOG
#57 STONE
REBAR ROD
INSTALL 2' FROM
END OF LOG
BOULDERS TO BE
BURIED AND PLACED
AT END OF LOGS
KEY INTO BANK
A MINIMUM OF 2 FT.
EADER LOG, TYP.
FOOTER LOG, TYP
2' MIN.
' MIN.
ABED
EXISTING POOL
-Y2" REBAR ROD
FILTER FABRIC, TYP.
NAIL FILTER FABRIC
TO BACK OF LOG
SECTION A -A
° TYPICAL
`-
LOG
DETAIL
SILL
N.T.S.
° NOTES LOG SILL:
PLACE LOG SILL JUST UPSTREAM OF EXISTING POOL.
THE LOGS SHALL BE EXISTING HARDWOOD TREE SPECIES
WITH A MINIMUM TRUNK DIAMETER OF 18'' REMOVED AS PART
OF THE CLEARING OPERATION WITHIN THE CONSTRUCTION LIMITS
AS SHOWN ON THE PLANS
THE LENGTH OF EACH LOG SHALL BE SUFFICIENT TO ALLOW PROPER
CONSTRUCTION IN ACCORDANCE WITH THE LOG SILL DETAIL.
LOG SILL SHALL BE CONSTRUCTED ACCORDING TO THE LOG SILL DETAIL
SHOWN ON THE PLANS OR AS DIRECTED BY THE CONTRACTING OFFICER.
LOGS SHALL BE ANCHORED TOGETHER BY PINNING WITH 5%4" REBAR AND
ANCHORED TO THE STREAMBED AS DIRECTED. PLATE THE UPSTREAM SIDE
OF THE LOGS WITH TYPE 2 FILTER FABRIC AND NO. 57 STONE. THE FILTER
FABRIC SHALL BE SECURELY FASTENED TO THE BACK OF THE LOG USING
GALVANIZED ROOFING NAILS ON APPROXIMATELY 8'' CENTERS. THE LOG
SHALL BE KEYED INTO THE BANK AT THE DOWNSTREAM END. THE CONTRACTOR
SHALL FURNISH AND INSTALL ALL LOGS PER THE PLANS OR AS DIRECTED.
HARDWOOD TREES ENCOUNTERED DURING CLEARING AND GRUBBING MAY BE
IDENTIFIED AND STOCKPILED FOR USE AS LOGS. CARE SHALL BE TAKEN TO
PRESERVE THE LOG STRUCTURE ON THE HARVESTED TREES TO BE USED
AS LOG SILLS AS SHOWN ON THE DETAIL IN THE PLANS.
6. (OPTIONAL STEP IF NEEDED TO HOLD BRANCHES
CLOSE TO GROUND SURFACE AT TOP OF
STREAMBANK). ABOUT 1/2 -2/3 OF THE WAY
UP THE BANK, PLACE STAKES IN A ROW,
SPACED 3' APART. HAMMER TO GET STARTED.
WRAP WIRE AROUND 1ST STAKE; CONNECT TO
2ND STAKE AND WRAP; CONNECT TO 3RD STAKE
AND WRAP, ETC.
7.USING SHOVELS AND BUCKETS OR TRACK HOE
BUCKET, SPRINKLE SOIL THROUGH THE CUTTINGS
8.IF USING OPTIONAL STAKES, HAMMER INTO BANK
9. WRAP WIRE NEAR TOP OF STAKES IN
CRISSCROSS PATTERN.
10FINISH BY HAMMERING REMAINING STAKES INTO
BANK.
US Army Corps
of Engineers
Wilmington District
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PLATE
NUMBER
EC -4
SHEET 410E 64