20201892 Ver 1_Update Outfall_20211206

Strickland, Bev
From: Jonathan Carter <[e-mail]>
Sent: Monday, December 6, 2021 10:24 AM
To: Jennifer Robertson; Johnson, Alan
Cc: Tommy Leppert; Perez, Douglas J
Subject: RE: [External] RE: Smith Village 20-1892
Attachments: 2021-12-02-Smith-plans-NCDEQ.pdf
CAUTION: External email. Do not click links or open attachments unless you verify. Send all suspicious email as an attachment to
Report Spam.
Jennifer / Alan,
We revised the Stormwater Control Structure Outlets to meet the loo-year storm and added rock check
dams. Please see attached plans. We resubmitted to Iredell County this morning for the revision.
Thank you,
Jonathan A. Carter, P.E.
President / Owner
Bluestone Land Management, PLLC
470 N. Broad Street, Suite A
Mooresville, NC 28115
Mailing Address:
ii5 Autumn Frost Avenue
Statesville, NC 28677
Cell: [phone]
Office: [phone]
Email: [e-mail]
www.bluestonelandmanagement.com
From: Jennifer Robertson <[e-mail]>
Sent: Wednesday, December 1, 2021 3:48 PM
To: Jonathan Carter <[e-mail]>; Johnson, Alan <[e-mail]>
Cc: Tommy Leppert <[e-mail]>; Perez, Douglas J <[e-mail]>
Subject: RE: [External] RE: Smith Village 20-1892
Awesome, thanks!
Thank you,
Jennifer L Robertson, President
ATLAS Environmental, Inc.
338 S. Sharon Amity Road #411
Charlotte, NC 28211
[phone] office
[phone] mobile
www.atlasenvi.com
Offices in Asheville and Charlotte
i

From: Jonathan Carter <[e-mail]>
Sent: Wednesday, December 1, 2021 3:47 PM
To: Jennifer Robertson <[e-mail]>; Johnson, Alan <[e-mail]>
Cc: Tommy Leppert <[e-mail]>; Perez, Douglas J <[e-mail]>
Subject: RE: [External] RE: Smith Village 20-1892
Jennifer,
I will have them completed by the end of day tomorrow. I had some other items to address on these plans and
wanted to include everything on one revision.
Thank you,
Jonathan A. Carter, P.E.
President / Owner
Bluestone Land Management, PLLC
470 N. Broad Street, Suite A
Mooresville, NC 28115
Mailing Address:
ii5 Autumn Frost Avenue
Statesville, NC 28677
Cell: [phone]
Office: [phone]
Email: [e-mail]
www.bluestonelandmanagement.com
From: Jennifer Robertson <[e-mail]>
Sent: Wednesday, December 1, 2021 3:46 PM
To: Johnson, Alan <[e-mail]>; Jonathan Carter <[e-mail]>
Cc: Tommy Leppert <[e-mail]>; Perez, Douglas J <[e-mail]>
Subject: RE: [External] RE: Smith Village 20-1892
Jonathan,
Checking in for the stormwater discharge diagram Alan needs in order to issue the 401 for Smith Village. We
are required to do stream mitigation so I would like to get the 404 and 401 sent to NC Division of Mitigation
Services soon so they can issue the invoice. Thanks!
Thank you,
Jennifer L Robertson, President
ATLAS Environmental, Inc.
338 S. Sharon Amity Road #411
Charlotte, NC 28211
[phone] office
[phone] mobile
www.atlasenvi.com
Offices in Asheville and Charlotte
2

From: Johnson, Alan <[e-mail]>
Sent: Monday, November 22, 2021 8:50 AM
To: Jennifer Robertson <[e-mail]>; Jonathan Carter
<jonathan.carter@ bluestonelandmanagement.com>
Cc: Tommy Leppert <[e-mail]>; Perez, Douglas J <[e-mail]>
Subject: RE: [External] RE: Smith Village 20-1892
Please send the requested site diagram regarding the stormwater discharge and I can issue the
permit/approval.
See comments below.
Thanks
Alan Johnson
DWR
Division of Water Resources
Alan D Johnson — Senior Environmental Specialist
NC Dept. of Environment & Natural Resources (NCDENR)
Division of Water Resources - Water Quality Regional Operations
610 East Center Ave., Suite 301, Mooresville, NC 28115
Phone: [phone] Fax: [phone]
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 unless the content is exempt by statute or other regulation.
From: Jennifer Robertson [mailto:[e-mail]]
Sent: Tuesday, November 16, 2021 1:06 PM
To: Jonathan Carter <[e-mail]>
Cc: Tommy Leppert <[e-mail]>; Johnson, Alan <[e-mail]>
Subject: FW: [External] RE: Smith Village 20-1892
CAUTION: External email. Do not click links or open attachments unless you verify. Send all suspicious email as an attachment to
Report Spam.
Jonathan,
Will you us a diagram of option A below so Alan can keep it with the file? He is ready to issue the 401 other
than this request. We will need to make sure that these are installed at the SCM's.
3

Tommy,
Keeping you in the loop so you can make sure these additional outlet protection measures are installed at
Smith Village.
Thank you,
Jennifer L Robertson, President
ATLAS Environmental, Inc.
338 S. Sharon Amity Road #411
Charlotte, NC 28211
[phone] office
[phone] mobile
www.atlasenvi.com
Offices in Asheville and Charlotte
From: Johnson, Alan <[e-mail]>
Sent: Tuesday, November 16, 2021 12:59 PM
To: Jennifer Robertson <[e-mail]>
Subject: RE: [External] RE: Smith Village 20-1892
That is fine, just send me a diagram, so that it is include with their plans and our application.
did mention earlier that the rocks/boulders used for the "check dams" be large enough to not
be displaced during large events.
DWR
Dfvfsfon of Water Resources
Alan D Johnson — Senior Environmental Specialist
NC Dept. of Environment & Natural Resources (NCDENR)
Division of Water Resources - Water Quality Regional Operations
610 East Center Ave., Suite 301, Mooresville, NC 28115
Phone: [phone] Fax: [phone]
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 unless the content is exempt by statute or other regulation.
4

From: Jennifer Robertson [mailto:[e-mail]]
Sent: Tuesday, November 16, 2021 12:25 PM
To: Johnson, Alan <[e-mail]>; Jonathan Carter <[e-mail]>
Subject: FW: [External] RE: Smith Village 20-1892
CAUTION: External email. Do not click links or open attachments unless you verify. Send all suspicious email as an attachment to
Report Spam.
Alan,
See Jonathan's response below.
Thank you,
Jennifer L Robertson, President
ATLAS Environmental, Inc.
338 S. Sharon Amity Road #411
Charlotte, NC 28211
[phone] office
[phone] mobile
www.atlasenvi.com
Offices in Asheville and Charlotte
From: Jonathan Carter <[e-mail]>
Sent: Thursday, November 4, 2021 3:20 PM
To: Jennifer Robertson <[e-mail]>; Johnson, Alan <[e-mail]>
Subject: RE: [External] RE: Smith Village 20-1892
Jennifer,
We would prefer to place the rip rap with check dams to installing a plunge pool.
Jonathan A. Carter, P.E.
President / Owner
Bluestone Land Management, PLLC
470 N. Broad Street, Suite A
Mooresville, NC 28115
Mailing Address:
ii5 Autumn Frost Avenue
5

Statesville, NC 28677
Cell: [phone]
Office: [phone]
Email: [e-mail]
www.bluestonelandmanagement.com
From: Jennifer Robertson <[e-mail]>
Sent: Wednesday, November 3, 2021 12:41 PM
To: Johnson, Alan <[e-mail]>; Jonathan Carter <[e-mail]>
Subject: RE: [External] RE: Smith Village 20-1892
Jonathan,
Can we include a conveyance of rip rap with check dams down to the streams or a concrete level spreader at
the outlet plunge pool on the SCM outlets?
Thank you,
Jennifer L Robertson, President
ATLAS Environmental, Inc.
338 S. Sharon Amity Road #411
Charlotte, NC 28211
[phone] office
[phone] mobile
www.atlasenvi.com
Offices in Asheville and Charlotte
From: Johnson, Alan <[e-mail]>
Sent: Wednesday, November 3, 2021 12:15 PM
To: Jonathan Carter <[e-mail]>
Cc: Jennifer Robertson <[e-mail]>
Subject: RE: [External] RE: Smith Village 20-1892
This is the type of event I am referring (attached). Below is a comment I provided on another
project.
So, I have always struggled with SW discharge from a bmp that is released to a steep slope
leading to a stream. Typically the flow leaves the dissipater pad and then (with large events)
rushes down slope, eroding and scouring its way to the small stream below. Potential options
6

(rough idea/concept): (A) The dissipater pad includes "checkdams" of larger rock. Depending
on the discharge the size, width and number of checkdams (or plunge pools) vary. Or (B) a
permanent well-constructed/hardened truly level spreader is utilized. Thanks, alan

8

DWR
Division of Water Resource5
Alan D Johnson — Senior Environmental Specialist
NC Dept. of Environment & Natural Resources (NCDENR)
Division of Water Resources - Water Quality Regional Operations
610 East Center Ave., Suite 301, Mooresville, NC 28115
Phone: [phone] Fax: [phone]
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 unless the content is exempt by statute or other regulation.
From: Jonathan Carter [mailto:[e-mail]]
Sent: Wednesday, November 3, 2021 11:58 AM
To: Jennifer Robertson <[e-mail]>; Johnson, Alan <[e-mail]>
Cc: Perez, Douglas J <[e-mail]>
Subject: [External] RE: Smith Village 20-1892
CAUTION: External email. Do not click links or open attachments unless you verify. Send all suspicious email as an attachment to
Report Spam.
Jennifer,
We are providing rip rap aprons at each outlet. Will this suffice?
Thank you,
Jonathan A. Carter, P.E.
President / Owner
Bluestone Land Management, PLLC
470 N. Broad Street, Suite A
Mooresville, NC 28115
Mailing Address:
ii5 Autumn Frost Avenue
Statesville, NC 28677
9

Cell: [phone]
Office: (7)4) 664-1973
Email: [e-mail]
www.bluestonelandmanagement.com
From: Jennifer Robertson <[e-mail]>
Sent: Wednesday, November 3, 2021 11:51 AM
To: Johnson, Alan <[e-mail]>; Jonathan Carter <[e-mail]>
Cc: Perez, Douglas J <[e-mail]>
Subject: RE: Smith Village 20-1892
Jonathan,
See Alan's stormwater discharge comments below. Do you have any additional information regarding the
outlets that you can provide to show that we will not get erosion at the pond outlets?
Alan,
In other parts of the state (Neuse for example) we have to extend SCM outlets to the stream so that the buffer
does not erode.
Thank you,
Jennifer L Robertson, President
ATLAS Environmental, Inc.
338 S. Sharon Amity Road #411
Charlotte, NC 28211
[phone] office
[phone] mobile
www.atlasenvi.com
Offices in Asheville and Charlotte
NVIRONMENTAL
From: Johnson, Alan <[e-mail]>
Sent: Wednesday, November 3, 2021 11:03 AM
To: Jennifer Robertson <[e-mail]>
Cc: Perez, Douglas J <[e-mail]>
Subject: Smith Village 20-1892
Regarding SW, it appears that site has some strong relief. The discharge for the SW outfall
should be constructed to dissipate the large/high velocity discharge from storm
events. Scour/plunge pools and/or level spreaders may be appropriate to prevent erosion and
10

concentrated flow paths over time from these outfalls. No outfall should discharge within 30
ft. of the creek(s)
The project is still on PN.
Alan
Dkkion of Water Rcsouu
Alan D Johnson — Senior Environmental Specialist
NC Dept. of Environment & Natural Resources (NCDENR)
Division of Water Resources - Water Quality Regional Operations
610 East Center Ave., Suite 301, Mooresville, NC 28115
Phone: [phone] Fax: [phone]
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 unless the content is exempt by statute or other regulation.
11

0

w
ry
Q
U
0)
3
2
'v
c
0
0
c
0
U
c
0
E
0
w
I
00
M
I
U
/
m
a
m
t
m
c
0
CL
0
Q
aZ
rn
ca
m
0
a_
I
m
rn
0
t
E
I
0
O
0
I
O
N
O
N
/
0
N
O
N
m
U
a�
0
J
m
/
NOTE:
1. THE BAFFLE MATERIAL NEEDS TO BE SECURE AT
THE BOTTOM AND SIDES USING STAPLES OR BY
TRENCHING AS FOR SILT FENCE.
2. MOST OF THE SEDIMENT WILL ACCUMULATE IN
THE FIRST BAY, SO THIS SHOULD BE READILY
ACCESSIBLE FOR MAINTENANCE. 3:1 SLOPES
SUGGESTED AT ALL FLOW ENTRY POINTS FOR
EQUIPMENT ACCESS.
3. POROUS BAFFLES ARE REQUIRED ON ALL BASINS
AND TRAPS PER LATEST EDITION OF NCDENR
EROSION CONTROL MANUAL.
H
Lu
J
z
cTn v� Tn of innnor �nno�
CORE FIBER MESH OR SIMILAR MATERIAL.
STAPLED OR TRENCHED INTO BOTTOM OR SIDE.
GENERAL NOTES:
1. GRAVEL AND RIP RAP FILTER BERM BASIN
SHOULD BE USED TO PROTECT EXISTING PIPE
INVERTS THAT DRAIN 5 ACRES OR LESS.
2. DIMENSIONS SHOWN ARE THE MINIMUM
ACCEPTED UNLESS OTHERWISE NOTED.
3. CLEANOUT PRIOR TO SEDIMENT REACHING HALF
OF BERM HEIGHT.
CONSTRUCTION SPECIFICATIONS
1. THE TOP OF THE EARTH DIKE
OVER THE INLET PIPE AND THOSE
DIKES CARRYING WATER TO THE
PIPE SHALL BE AT LEAST 1.5 FEET
HIGHER AT ALL POINTS THAN THE
TOP OF THE INLET PIPE.
2. THE PIPE SHALL BE FLEXIBLE WITH
WATER TIGHT CONNECTING
BANDS. FLEXIBLE PIPE SHOULD
BE STAKED ON EITHER SIDE.
3. A RIP RAP APRON SHALL BE
PROVIDED AT THE OUTLET, IF
EMPTYING INTO A DISTURBED
AREA.
4. THE SOIL AROUND AND UNDER
THE INLET PIPE AND ENTRANCE
SECTION SHALL BE HAND TAMPED
IN 4" LIFTS TO THE TOP OF THE
EARTH DIKE.
5. FOLLOW-UP INSPECTION AND ANY
NEEDED MAINTENANCE SHALL BE
PERFORMED AFTER EACH STORM
BY THE FINANCIALLY
RESPONSIBLE PARTY OR HIS
AGENT.
6. OUTLET PIPE SHOULD BE TAKEN
OVER OR THROUGH ANY SILT
FENCE, TAKING CARE NOT TO
VOID THE EFFECTIVENESS OF THE
SILT FENCE.
EXTEND TO EDGE
OF DISTURBANCE
RIP -RAP APRON
POROUS BAFFLES
#5 WASHED STONE
F� \ - 3'
H MIN.
CLEANOUT ELEVATION (SEE
NOTE 3)
uj
uj
Lu
Lu
Of
Wa
mQ
wQ
Lu
m w
2 w
zw
0<
QLL
=<
N<
Lu
Lu
J W
Z LL
I- Cn
LL
z U)
O LL
I- W
D LL
0
00
0
ILL
0
w0
U)
0
N
N
N
N
CLASS I RIP RAP
6" MIN.
2�
;Iillill il- FINISHED GRADE
PIPE
SECTION
CLASS I RIP RAP
PLOVV
_e Doo a o0
� PIPE �
#5 WASHED STONE 6" MIN. THICK
X 3' MIN. HIGH
PERSPECTIVE VIEW
GRAVEL AND RIP RAP FILTER BERM
z
18" FLEXIBLE PIPE
r
TIE DOWN
(10' MAX SPACING)
4'( MIN.)
TIE DOWN AT END
AT LESS THAN 1 % SLOPE
VOLUME = 3600 CF PER ACRE DISTURBED TO
TOP OF BERM ELEVATION.
SURFACE AREA RQUIRED = 435 SF PER CFS
Q10.
LENGTH AS NECESSARY
TO GO THRU DIKE
4' MIN.
I�
lr
18" PIPE
SEDIMENT PIT (NOT
REQUIRED IF BASIN
IS DOWNSTREAM
OF PIPE OUTLET)
RIP RAP AND
WASHED STONE
FILTER BERM
STAKES a -II11 l IIII
1I-
a a a I _ 1=1J1-111=1Ti-
a II-I_-�i_iii
a a II=III=11r SEDIMENT PIT (NOT
a " a a a III=III=III=
REQUIRED IF BASIN
a IIIIIIIIIIIIIIIIII IS DOWNSTREAM
> o a „ a =III=III=III-
a =III=III=III- OF PIPE OUTLET) �a
-III=1 I
o a =III=III= EARTH DIKE
TEMPORARY SLOPE DRAIN
RIP RAP AND
WASHED STONE
FILTER BERM
NOTE:
PLEASE REFER TO NCESCPDM SECTION #6.60 FOR
ADDITIONAL DESIGN SPECIFICATIONS REGARDING
TEMPORARY SEDIMENT TRAPS.
SKIMMER
SEDIMENT
BASIN DESIGN
CRITERIA
DRAINAGE
AREA
< 10 AC.
(ACRES)
MIN. LENGTH
TO WIDTH
2:1
RATIO
H
LU
0
MAX.
LENGTH TO
WIDTH RATIO
6:1
MIN.
1800 (CU. FT.
VOLUME
PER AC.
REQUIRED
DISTURBED)
SURFACE
325 (SQ. FT.
AREA
PER CFS
REQUIRED
Q10)
C
AVERAGE WIDTH (W) = AREA-
L
* AREA OF BASIN WATER SURFACE
AT TOP OF PRINCIPAL SPILLWAY
INFLOW
STRUCTURE
10,
MIN.
SKIMMER
DEWATERING
DEVICE
REFER TO NCESCPDM SECTION
#6.64 FOR ADDITIONAL DESIGN
SPECIFICATIONS REGARDING
EMBANKMENT SKIMMER SEDIMENT BASINS.
C
EMERGENCY
/ SPILLWAY
�v
BAFFLES
PLAN VIEW a
Lu FL
w Cn
r
z
z� w
INFLOW x
w LL r W=5' MIN.
STRUCTURE BAFFLES g z w
Z N ILL
0
� NJ �
2
DEWATERING
ZONE
FILTER FABRIC J SEDIMENT STORAGE ZONE
CROSS-SECTION VIEW
SKIMMER BASINS
BASIN ID
DRAINAGE
AREA (AC)
DENUDED
AREA (AC)
C
Q10
(CFS)
VOLUME
SURFACE AREA
DIMENSIONS
CLEANOUT
DEPTH H/2
(FT)
H (FT)
T (FT)
Z (FT)
TOP OF
DAM W
(FT)
WEIR
LENGTH
WL (FT)
SKIMMER
REQUIRED
a
(FT)
PROVIDED(FT')
REQUIRED(FT')
PROVIDED (FTZ)
L (FT)
L/2 (FT)
PIPE DIA.
(IN)
ORIFICE
(IN)
SK-3
7
7
0.6
25.66
12,600
22,476
8,340
8,800
176
50
1
2
1.5
4.5
838
10
2.5
2
SK-4
7.3
7
0.6
26.76
12,600
23,370
8,698
8,940
132
68
1
2
1.5
4.5
844
10
2.5
2
SK-6
1.08
1.08
0.6
4.536
1,944
4,644
1,944
2,100
70
30
1
3
1.5
4.5
839.5
5
2
0.75
.5
0.
1.6
5, 0
1 3
4, 6
4,
6
5
SK
3.5
3.5
.6
16.0
30
2 ,95
21
6, 60
20
58
1
.5
5
SK-9
2.8
2.8
0.6
12.84
5,040
17,485
4,171
5,852
133
44
1
2
1.5
5
842
5
2.5
1.25
EMBANKMENT
EMERGENCY
SPILLWAY
ANTI -SEEP
COLLAR
SKIMMER BASIN
L
W
(10' MIN.)
REMOVABLE TRASH RACK IS OPTIONAL
FOR EASE IN MAINTENANCE.
ANTI -VORTEX PLATE
BOLTED TO RCP/CMP RISER TRASH RACK
SECTION A -A
ANTI -SEEP COLLARS
SPILLWAY
TOP OF DAM
3 � 3
L
(10' MIN.)
EMERGENCY SPILLWAY
GENERAL NOTES:
1.
AREA UNDER EMBANKMENT SHALL BE CLEARED, GRUBBED, AND STRIPPED OF ANY VEGETATION AND ROOT
MAT. THE POOL AREA SHALL BE CLEARED.
2.
THE FILL MATERIAL FOR THE EMBANKMENT SHALL BE FREE OF ROOTS OR OTHER WOODY VEGETATION AS
WELL AS OVERSIZED STONES, ROCKS, ORGANIC MATERIAL OR OTHER OBJECTIONABLE MATERIAL. THE
EMBANKMENT SHALL BE COMPACTED BY TRAVERSING WITH EQUIPMENT WHILE BEING CONSTRUCTED.
SPILLWAYS SHOULD NOT BE CONSTRUCTED THROUGH FILL SECTIONS.
3.
SEDIMENT SHALL BE REMOVED AND BASIN RESTORED TO ITS ORIGINAL DIMENSIONS WHEN THE SEDIMENT
HAS ACCUMULATED TO ONE-HALF THE DESIGN DEPTH OF THE BASIN. REMOVED SEDIMENT SHALL BE
DEPOSITED IN A SUITABLE AREA IN SUCH A MANNER THAT IT WILL NOT ERODE.
4.
THE BASIN SHALL BE INSPECTED AFTER EACH RAIN AND REPAIRS MADE AS NECESSARY.
5.
CONSTRUCTION OPERATION SHALL BE CARRIED OUT IN SUCH A MANNER THAT EROSION AND WATER
POLLUTION IS MINIMIZED.
6.
ALL CUT AND FILL SLOPES SHALL BE 2:1 OR FLATTER.
7.
IF SEDIMENT BASIN IS IN USE 15 DAYS OR LONGER, EMBANKMENTS SHOULD BE SEEDED OR OTHERWISE
PROPERLY STABILIZED.
8.
STORAGE AREA IS SHOWN AS RECTANGULAR FOR ILLUSTRATIVE PURPOSES ONLY, AND MAY BE
CONSTRUCTED IN ANY SHAPE PROVIDED THE MINIMUM VOLUME & SURFACE AREA REQUIREMENTS ARE MET.
THE BASIN SHOULD ALSO BE ORIENTED SUCH THAT THE FILTER AND THE MAIN FLOW OF WATER AND
SEDIMENT ARE ON OPPOSITE ENDS ON THE LONGER BASIN DIMENSIONS. FLOW SHOULD BE DIRECTED TO
THE INLET ZONE OF THE BAFFLE SYSTEM. WHERE MULTIPLE FLOWS ARE DIRECTED TO A BASIN, A SET OF
POROUS BAFFLES SHALL BE ERECTED AND MAINTAINED FOR EACH FLOW WITH BAFFLE ZONE AREAS
APPORTIONED TO THE FLOW ENTERING EACH INLET ZONE.
9.
REQUIRED STORAGE IS 1800 CUBIC FEET OF STORAGE VOLUME PER DENUDED ACRE. RECOMMENDED
STORAGE IS 3600 CUBIC FEET OF STORAGE PER ACRE DISTURBED.
RIP -RAP
APRON 10.
THE LENGTH OF THE STONE OUTLET (SPILLWAY) IS TO BE BASED ON A 10 YEAR STORM.
E TABLE)
11.
WHENEVER TOPOGRAPHY ALLOWS, THE BASIN LENGTH SHOULD BE TWICE (2X) THE BASIN WIDTH, TO ALLOW
FOR SETTLING.
12.
CLEANOUT STAKES SHALL BE PLACED IN ALL SEDIMENT BASINS AT THE LOW POINT IN THE BASIN. THE
STAKES SHALL BE MARKED SHOWING THE HALF FULL, CLEANOUT POINT, OF THE BASIN.
13.
SAFETY FENCING 3' HIGH SHOULD BE PLACED AROUND ALL SEDIMENT BASINS AND OR WARNING SIGNS IF
TRESPASSING IS LIKELY.
14.
FOR DESIGN OF RISER TYPE SEDIMENT BASINS, REFER TO THE NORTH CAROLINA DEPARTMENT OF
ENVIRONMENTAL & NATURAL RESOURCES MANUAL (LATEST EDITION).
15.
SEE POROUS BAFFLE DETAIL FOR SIZING AND PLACEMENT TO BAFFLE ZONES IN BASIN.
16.
CONTRACTOR MAY SUBSTITUTE CMP ANTI -SEEP COLLARS IF DESIRED. COLLAR TO PROJECT A MINIMUM OF
1.5 FT FROM OUTSIDE DIAMETER OF PIPE AND BE WELDED TO PIPE TO MAKE WATER TIGHT.
SEDIMENT BASINS
VOLUME
SURFACE AREA
DIMENSIONS
SKIMMER
ANTI -FLOTATION
CLEANOUT
RISER
TOP OF
WEIR
BARREL
BARREL
REQUIRED
SKIMMER
ORIFICE
BASIN ID
DRAINAGE
DENUDED
C
Qlo
DEPTH H/2
Y (FT)
H (FT)
HEIGHT
DAM W
LENGTH
SPILLWAY
BOTTOM
SIZE
RISER SIZE
LENGTH
ANTI -SEEP
AREA (AC)
AREA (AC)
(CFS)
PROVIDED (FT')
REQUIRED (FTZ
PROVIDED (FT
L (FT)FL/2(FT)
ELEV. (FT)
BASIN ELEV.
PIPE DIA.
DIAMETER
MATERIAL
COLLARS
D
S
(FT)
(FT)
Z (FT)
(FT)
WL (FT)
MATERIAL
(FT)
(IN)
(IN)
SB-1
20.5
18
0.6
52.4
32,400
151,421
22,825
24,910
1 275
91
4.25
10
8.5
9
854
12
852.5
844
4
3
36" RCP
5' X 5'
1 52.4
6FT x 6FT
1
6
SB-2
12.2
12
0.6
38.08
21,600
111,128
16,453
17,940
184
98
3.75
11
1 8.5
1 11
862
12
860.5
851
L 3
2.5
24" RCP
5' X 5'
66.2
6FT x 6FT
1
6
J NOTES
'
I. INLET MAINTENANCE SHALL BE DOCUMENTED IN PROJECT LOG BOOK.
2. FILTER TYPES SHALL BE APPROVED BY THE TOWN INSPECTOR PRIOR
TO INSTALLATION.
3. FILTER BAGS MAY BE REMOVED WHEN SITE IS STABILIZED AT
THE DIRECTION OF THE ENGINEER.
4. FILTER BAGS SHALL BE REMOVED PRIOR TO STREET ACCEPTANCE.
5. FILTER BAGS SHALL BE CLEANED OR REPLACED ON A REGULAR
BASIS (NOT BE MORE THAN HALF FULL AT ANY TIME).
6. FILTER BAGS SHALL NOT BE ALLOWED IN EXISTING TOWN OR NCDOT
ROADS.
GATGH
CATCH BASIN SILT SACK
O
SEDIMENT BASIN
1. PREPARE SOIL BEFORE INSTALLING ROLLED EROSION CONTROL
N PRODUCTS (RECP'S),
RECP'S), INCLUDING ANY NECESSARY APPLICATION OF LIME,
r "v FERTILIZER AND SEED.
20"
3.3'
3.4 STAPLES PER SQUARE YARD
STAPLE PATTERN GUIDE "D"
INSTALLATION
8' WIDE ROLLS
TLET
W-O-SEED DON NOT SEED PREPARED AREA. WHEN USING CELL
CELL-O-SEED MUST BE INSTALLED WITH PAPER SIDE DOWN.
2. BEGIN AT THE TOP OF THE BY ANCHORING THE RECP'S IN A 6" DEEP X 6" W I-/ \/�
WIDE TRENCH WITH APPROXIMATELY 12" OF RECP EXTENDED BEYOND THE
UP -SLOPE PORTION OF THE TRENCH. ANCHOR THE RECP'S WITH A ROW OF
SEAM STICH STAPLES/STAKES APPROXIMATELY 12" APART IN THE BOTTOM OF THE
TRENCH. BACKFILL AND COMPACT THE TRENCH AFTER STAPLING. APPLY
SEED TO COMPACTED SOIL AND FOLD REMAINING 12" PORTION OF RECP'S - �� r ] / 4"
BACK OVER SEED AND COMPACTED SOIL. SECURE RECP'S OVER
COMPACTED SOIL WITH A ROW OF STAPLES/STAKES SPACE /\\ w W W W - �- - =- W v
APPROXIMATELY 12" ACROSS THE WIDTH OF THE RECRS.11
_ W W W W W W W
3. ROLL CENTER RECP'S IN DIRECTION OF WATER FLOW IN THE BOTTOM OF __=__ \//j//j ij _-�II_ _____________________ __ ___ ] \ y . y y y y y y O
CHANNEL. RECP'S WILL UNROLL WITH APPROPRIATE SIDE AGAINST THE _________\\%\\%\\%\ �I r \\ ' , ' y y 2"-5"
SOIL SURFACE. ALL RECP'S MUST BE SECURELY FASTENED TO SOIL =_____=_=_=_=_-_- \ \\/ ��__________________________-_____________ �►
SURFACE BY PLACING STAPLES/STAKES IN APPROPRIATE LOCATIONS AS \/ \
-
SHOWN IN THE STAPLE PATTERN GUIDE. WHEN USING THE DOT SYSTEM, ---------------- --- ------ --------------- � \\/N
STAPLES/STAKES SHOULD BE PLACED THROUGH EACH OF THE COLORED \\/\\ ____ __
DOTS CORRESPONDING TO THE APPROPRIATE STAPLE PATTERN. __- \\/�\\\\ -____ __ _-\%j W W W W W W W W W O
/ -
4. PLACE CONSECUTIVE RECP'S END OVER END (SINGLE STYLE) WITH A 4"-6" - \%\\ -- _ �/\\//
OVERLAP. USE A DOUBLE ROW OF STAPLES STAGGERED 4" APART AND 4" --=--___/�\\\\ 4"-6"
ON CENTER TO SECURE RECP'S----------------------
5. FULL LENGTH EDGE OF RECP'S AT TOP OF SIDE SLOPES MUST BE m \VAVA_________% %ANCHORED WITH A ROW OF STAPLES/STAKES APPROXIMATELY 12" APART
IN W W W W W W W W W W W
A 6" DEEP X 6" WIDE TRENCH. BACKFILL AND COMPACT THE TRENCH O A O
AFTER STAPLING. B
CRITICAL POINTS
6. ADJACENT RECP'S MUST BE OVERLAPPED APPROXIMATELY 2"-5"
(DEPENDING ON RECP'S TYPE) AND STAPLED. A. OVERLAP AND SEAMS
7. IN HIGH FLOW APPLICATIONS, A STAPLE CHECK SLOT IS RECOMMENDED AT B. PROJECTED WATER LINE
30 TO 40 FOOT INTERVALS. USE A DOUBLE ROW OF STAPLES STAGGERED
4" APART AND 4" ON CENTER OVER ENTIRE WIDTH OF CHANNEL. C C. BOTTOM/SIDE SLOPE VERTICES
8. THE TERMINAL END OF THE RECP'S MUST BE ANCHORED WITH A ROW OF
STAPLES/STAKES APPROXIMATELY 12" APART IN A 6" DEEP X 6" WIDE NOTE:
TRENCH. BACKFILL AND COMPACT THE TRENCH AFTER STAPLING.
HORIZONTAL STAPLE SPACING SHOULD BE
NOTE: ALTERED IF NECESSARY TO ALLOW STAPLES TO
IN LOOSE SOIL CONDITIONS, THE USE OF STAPLE OR STAKE LENGTHS SECURE THE CRITICAL POINTS ALONG SURFACE.
GREATER THAN 6" MAY BE NECESSARY TO PROPERLY ANCHOR THE
RECP'S. IN LOOSE SOIL CONDITIONS, THE USE OF STAPLE
TEMPORARY LINER INSTALLATION OR STAKE LENGTHS GREATER THAN 6" MAY BE
NECESSARY TO PROPERLY ANCHOR THE RECP'S.
u) M G zt
H 00 N O 4
� U a
FL1 W W I-
n 54 - U
r cn U,
QW ctU
�x ctz
24
W z
O
n
F�
"A N �A 0 Ni'l w21
Y
U
O
U
z
0
Lu
I.-
2
w
O
U
0
H
z
5
M
�
O
0
U
w
in
J
in
w
Q
0
0
w
z
9�
Q
of
I?
w
`L
a
cn
0
0
w
w
Lu
Lu
in
N
N
�
Q
N
N
N
V
z
N
IPROJECT #: 2020-0001 DATE: 12/i/2020 I
DRAWN BY: JAC CHECKED BY: JAC
TITLE
EROSION CONTROL
DETAILS
SHEET
C-3.8
i

w
ry
Q
U
rn
3
v;
•v
c
0
0
c
0
U
c
0
'co
0
w
I
Ib
M
I
U
/
m
m
t
m
c
CL
/
0
0
Q
Q1
co
0
I
I
N
rn
0
>
t
E
I
0
O
0
I
0
N
O
N
O
N
O
N
u,
U
a>
0
/
J
m
/
MAINTENANCE NOTES:
1. SKIMMER SHALL BE INSPECTED BY THE
FINANCIALLY RESPONSIBLE PARTY OR HIS
DESIGNATED AGENT WITHIN 24 HOURS AFTER
EACH RAIN EVENT EXCEEDING 1/2" (DAILY
DURING PROLONGED RAINFALL PERIODS) AND
AT LEAST WEEKLY REGARDLESS OF RAINFALL.
CLEANING AND MAINTENANCE NEEDED SHALL BE
PERFORMED IMMEDIATELY.
2. SHOULD THE SKIMMER BECOME CLOGGED WITH
DEBRIS OR SEDIMENT, PULL THE SKIMMER TO
THE SIDE OF BASIN WITH THE PULL ROPE AND
CLEAN. HEAVY EQUIPMENT SHOULD NOT BE
USED TO MOVE THE SKIMMER AND DRAIN LINES.
3. SEDIMENT DEPOSITS IN THE OUTLET ZONE OF
THE BASIN SHALL BE REMOVED WHEN THEY
IMPAIR THE SKIMMER FROM DRAINING THE
BASIN. PULL SKIMMER TO SIDE AND REMOVE
SEDIMENT DEPOSIT, THEN RESET SKIMMER TO
DESIRED LOCATION.
4. EXCAVATE A SHALLOW PIT UNDER THE SKIMMER
SO THAT IT WILL DRAIN THE ENTIRE BASIN.
SKIMMER SHOULD REST ON BOTTOM WITH A
POSITIVE DRAIN SO THAT WATER WILL NOT
STAND IN DRAIN PIPE AND FREEZE.
NOTES:
1. SKIMMER IS TO BE A SURFACE DEWATERING
DEVICE SUCH AS FAIRCLOTH SKIMMER OR
APPROVED DEVICE.
NOT INCLUDE WITH SKIMMER v
(SUPPLIED BY USER).
OUTLET END. FLEXIBLE JOINT (RADIATOR HOSE)
CONNECTION TO
OUTLET PIPE RISER
STANDARD SKIMMER
TEMPORARY SEEDING FOR WARM AND COOL SEASON
FARI Y SI IMNAFR SFARON STFFP SI nPFS
SEEDING
MIXTURE
40 LBS/ACRE OF GERMAN MILLET
80 LBS/ACRE OF TALL FESCUE
120 LBS/ACRE RYE (GRAIN)
80 LBS/ACRE TALL FESCUE
SEEDING
MAY 1 - AUGUST 15
OCTOBER 25 -DECEMBER 30
DATES
REFERTILIZE IF GROWTH IS NOT FULLY ADEQUATE.
BETWEEN DECEMBER 30 - FEBRUARY 15, ADD 50
LBS/ACRE OF ANNUAL KOBE LESPEDEZA.
APPLY 4000 LBS/ACRE STRAW OR EQUIVALENT
APPLY 4000 LBS/ACRE STRAW OR EQUIVALENT
HYDROSEEDING.
HYDROSEEDING.
SEEDING
APPLY LIME AND FERTILIZER PER SOIL TESTS, OR 2000
APPLY LIME AND FERTILIZER PER SOIL TESTS, OR 2000
AMENDMENTS
LBS/ACRE LIMESTONE AND 750 LBS/ACRE 10-10-10
LBS/ACRE LIMESTONE AND 750 LBS/ACRE 10-10-10
FERTILIZER.
FERTILIZER.
SEEDING SCHEDULE (SEASONAL)
C.FNTI F SI (IPFS STFFP SI nPFS
SEEDING
MIXTURE
80 LBS/ACRE OF TALL FESCUE
100 LBS/ACRE TALL FESCUE
30 LBS/ACRE SERICEA LESPEDEZA
(UNSCARIFIED AFTER AUGUST 15)
10 LBS/ACRE KOBE LESPEDEZA
SEEDING
FALL: AUGUST 25 - OCTOBER 15
FALL: AUGUST 25 - OCTOBER 15
DATES
LATE WINTER: FEBRUARY 15 - APRIL 15
LATE WINTER: FEBRUARY 15 - APRIL 15
TO EXTEND SPRING SEEDING INTO JUNE,
TO EXTEND SPRING SEEDING INTO JUNE,
ADD 15 LBS/ACRE HULLED BERMUDAGRASS
ADD 15 LBS/ACRE HULLED BERMUDAGRASS
OVERSEEDING OF KOBE LESPEDEZA OVER
OVERSEEDING OF KOBE LESPEDEZA OVER
FALL -SEEDED TALL FESCUE IS VERY EFFECTIVE.
FALL -SEEDED TALL FESCUE IS VERY EFFECTIVE.
SEEDING
APPLY LIME AND FERTILIZER PER SOIL TESTS, OR
APPLY LIME AND FERTILIZER PER SOIL TESTS, OR
AMENDMENTS
4000 LBS/ACRE LIMESTONE AND 1000 LBS/ACRE
4000 LBS/ACRE LIMESTONE AND 1000 LBS/ACRE
10-10-10 FERTILIZER.
10-10-10 FERTILIZER.
NOTE 1
GROUND COVER: PROTECTIVE COVER MUST BE ESTABLISHED ON ALL DISTURBED AREAS WITHIN 14 CALENDAR
DAYS AFTER LAND DISTURBING ACTIVITY IS COMPLETED OR HAS TEMPORARILY CEASED.
NOTE 2
GRADED SLOPES AND FILLS: PROTECTIVE COVER MUST BE ESTABLISHED ON ALL GRADED SLOPES AND FILLS WITHIN 14
CALENDAR DAYS AFTER A PHASE OF GRADING IS COMPLETED OR HAS TEMPORARILY CEASED.
GENERAL NOTES:
1. WATTLES MAY BE USED IN SLOPING DITCHES OR
CHANNELS TO SLOW VELOCITY OR TO CREATE SEDIMENT
TRAPS.
CHANNEL BLANKET
STAPLE ALONG
EDGE OF BLANKET
9" STRAW WATTLE
WOOD STAKE
STAKES TO BE PLACE
AT TOE OF SLOPE
(BOTH SIDES)
SEEDING SCHEDULE
CHANNEL
BOTTOM
O
.....
WATTLE
STAPLE ALONG
EDGE OF BLANKET
NOTES:
1. GRAVEL PAD TO BE A MINIMUM 18' W x 100' L AND
6" THICK. STONE SHALL BE RAILROAD BALLAST
(2-3" MINIMUM) ON FILTER FABRIC STABILIZATION
MAT.
2. ENTRANCE(S) SHOULD BE LOCATED TO PROVIDE
FOR MAXIMUM UTILIZATION BY ALL
CONSTRUCTION VEHICLES.
;IBLE
3. ENTRANCE MUST BE MAINTAINED IN A
CONDITION WHICH WILL PREVENT TRACKING OR
1T
DIRECT FLOW OF MUD ONTO STREETS.
PERIODIC TOP DRESSING WITH STONE WILL BE
NECESSARY.
4. ANY MATERIAL WHICH STILL MAKES IT ONTO THE
ROAD MUST BE CLEANED UP IMMEDIATELY.
5. WHEN NECESSARY, WHEELS MUST BE CLEANED
TO REMOVE SEDIMENT PRIOR TO ENTERING
PUBLIC STREETS. WHEN WASHING IS REQUIRED,
IT SHALL BE DONE ON AN AREA STABILIZED WITH
CRUSHED STONE WHICH DRAINS INTO AN
APPROVED SEDIMENT TRAP/BASIN.
6. ENTRANCES SHALL BE INSTALLED AT ALL POINTS
OF INGRESS & EGRESS UNTIL SITE IS STABILIZED,
FREQUENT CHECKS OF THE DEVICE AND TIMELY
MAINTENANCE MUST BE PROVIDED.
WOOD STAKE
WOOD STAKE TO ONLY
PENETRATE NETTING
TOP OF BLANKET
SPACING
SLOPES <1°%= 140'
SLOPES 1 % - 1.5% = 70'
SLOPES 1.5% - 2% = 50'
SLOPES 2% - 2.5% = 35'
SLOPES 2.5% - 3% = 30'
SLOPES 3% - 5% = 20'
SLOPES 5% - 7% = 15'
SLOPES > 7% = 10'
z_ \
to
2"-3" COARSE AGGREGATE
GEOTEXTILE WOVEN
EQUIVALENT TO MIRAFI 50OX
TEMPORARY CONSTRUCTION ENTRANCE
.DOE rd mm
m
=
m
m
NOTES:
1. CLASS OR MEDIAN SIZE OF RIPRAP, LENGTH,
WIDTH, AND DEPTH OF APRON PER RIPRAP
APRON DATA BLOCK SHOWN BELOW.
2. REFER TO THE NORTH CAROLINA
SEDIMENTATION AND EROSION CONTROL
MANUAL FOR RIP RAP APRON DESIGN
STANDARDS.
3. RIP RAP SHOULD EXTEND UP BOTH SIDES OF
THE APRON AND AROUND THE END OF THE PIPE
OR CULVERT AT THE DISCHARGE OUTLET AT A
MAXIMUM SLOPE OF 2:1 AND A HEIGHT NOT LESS
THAN TWO THIRDS THE PIPE DIAMETER OR
CULVERT HEIGHT.
4. THERE SHALL BE NO OVERFLOW FROM THE END
OF THE APRON TO THE SURFACE OF THE
RECEIVING CHANNEL. THE AREA TO BE PAVED
OR RIP RAPPED SHALL BE UNDERCUT SO THAT aIIIa
THE INVERT OF THE APRON SHALL BE AT THE
11=
SAME GRADE (FLUSH) WITH THE SURFACE OF
2
I
NATURAL GROUND
W
2
� =1111= -1111
I 1111=
�111=
4" #5 WASHED STONE
LAYER OF FILTER FABRIC
(MIFAFI 140N OR APPROVED EQUAL)
RIP RAP APRON
GENERAL NOTES:
1. UNIFORMLY GRADE A SHALLOW DEPRESSION
APPROACHING THE INLET.
2. DRIVE 5-FOOT STEEL POSTS 2 FEET INTO THE
GROUND SURROUNDING THE INLET. SPACE
POSTS EVENLY AROUND THE PERIMETER OF THE
INLET, A MAXIMUM OF 4 FEET APART.
3. SURROUND THE POSTS WITH WIRE MESH
HARDWARE CLOTH. SECURE THE WIRE MESH TO
THE STEEL POSTS AT THE TOP, MIDDLE, AND NCDOT #5 OR #57
BOTTOM. PLACING A 2-FOOT FLAP OF THE WIRE WASHED STONE
MESH UNDER THE GRAVEL FOR ANCHORING IS
RECOMMENDED.
4. PLACE CLEAN GRAVEL (NC DOT #5 OR #57 STONE)
ON A 2:1 SLOPE WITH A HEIGHT OF 16 INCHES
AROUND THE WIRE, AND SMOOTH TO AN EVEN
GRADE.
5. ONCE THE CONTRIBUTING DRAINAGE AREA HAS
BEEN STABILIZED, REMOVE ACCUMULATED
SEDIMENT, AND ESTABLISH FINAL GRADING
ELEVATIONS.
6. COMPACT THE AREA PROPERLY AND STABILIZED
IT WITH GROUNDCOVER. NCDOT#50R#57
WASHED STONE
W
I' MIN. FIL ILK FAt3Kl(; LAP
(IF NEEDED)
19-GAUGE HARDWARE CLOTH
4' MAX. (4' MESH OPENINGS)
i�
N
o 0 0 0 0 0 ?�
o 0 0 0 0 0
z_
co
N �
FILTERED
WATE
HARDWARE CLOTH AND GRAVEL INLET PROTECTION
MAINTENANCE NOTES:
1. STONE OUTLETS SHALL BE INSPECTED BY THE
FINANCIALLY RESPOSIBLE PARTY OR HIS
DESIGNATED AGENT WITHIN 24 HOURS AFTER
EACH RAIN EVENT EXCEEDING 1/2" (DAILY
DURING PROLONGED RAINFALL PERIODS) AND
AT LEAST WEEKLY REGARDLESS OF RAINFALL.
CLEANING AND MAINTENANCE NEEDED SHALL BE
PERFORMED IMMEDIATELY.
2. SEDIMENT DEPOSITS SHOULD BE REMOVED
AFTER EACH STORM EVENT AND DISPOSED OF IN
AN APPROVED LOCATION. ANY CONTAMINATED
STONE ON THE FACE OF THE OUTLET SHALL BE
REMOVED AND REPLACED WITH CLEAN WASHED
STONE.
NOTES:
1. SEDIMENT CONTROL STONE SHALL BE NO.5 OR
NO.57 STONE.
2. STONE OUTLETS TO BE USED AT ALL LOW
POINTS IN SILT FENCE RUNS.
HARDWARE CLOTH
ON WIRE FENCE
SEDIMENT CONTROL STONE
ON TOP OF FILTER FABRIC
(MIRAFI 70OX OR APPROVED EQUAL)
SEDIMENT CONTROL STONE
ON TOP OF FILTER FABRIC
(MIRAFI 70OX OR APPROVED EQUAL)
CROSS SECTION
MAINTENANCE NOTES:
1. FILTER BARRIERS SHALL BE INSPECTED BY THE
FINANCIALLY RESPONSIBLE PARTY OR HIS
AGENT IMMEDIATELY AFTER EACH RAINFALL AND
AT LEAST DAILY DURING PROLONGED RAINFALL.
ANY REPAIRS NEEDED SHALL BE MADE
IMMEDIATELY.
2. SHOULD THE FABRIC DECOMPOSE OR BECOME
INEFFECTIVE PRIOR TO THE END OF THE
EXPECTED USABLE LIFE AND THE BARRIER STILL
IS NECESSARY, THE FABRIC SHALL BE REPLACED
PROMPTLY.
3. SEDIMENT DEPOSITS SHOULD BE REMOVED
AFTER EACH STORM EVENT OR SILT FENCE
SHOULD BE REPLACED. THEY MUST BE REMOVED
WHEN DEPOSITS REACH APPROXIMATELY HALF
THE HEIGHT OF THE BARRIER. ANY SEDIMENT
DEPOSITS REMAINING IN PLACE AFTER THE SILT
FENCE IS REMOVED SHALL BE DRESSED TO
CONFORM TO THE EXISTING GRADE, PREPARED
AND SEEDED.
W
I' MIN. FIL ILK FAt3Kl(; LAP
(IF NEEDED)
19-GAUGE HARDWARE CLOTH
4' MAX. (4' MESH OPENINGS)
i�
N
o 0 0 0 0 0 ?�
o 0 0 0 0 0
z_
co
N �
FILTERED
WATE
HARDWARE CLOTH AND GRAVEL INLET PROTECTION
MAINTENANCE NOTES:
1. STONE OUTLETS SHALL BE INSPECTED BY THE
FINANCIALLY RESPOSIBLE PARTY OR HIS
DESIGNATED AGENT WITHIN 24 HOURS AFTER
EACH RAIN EVENT EXCEEDING 1/2" (DAILY
DURING PROLONGED RAINFALL PERIODS) AND
AT LEAST WEEKLY REGARDLESS OF RAINFALL.
CLEANING AND MAINTENANCE NEEDED SHALL BE
PERFORMED IMMEDIATELY.
2. SEDIMENT DEPOSITS SHOULD BE REMOVED
AFTER EACH STORM EVENT AND DISPOSED OF IN
AN APPROVED LOCATION. ANY CONTAMINATED
STONE ON THE FACE OF THE OUTLET SHALL BE
REMOVED AND REPLACED WITH CLEAN WASHED
STONE.
NOTES:
1. SEDIMENT CONTROL STONE SHALL BE NO.5 OR
NO.57 STONE.
2. STONE OUTLETS TO BE USED AT ALL LOW
POINTS IN SILT FENCE RUNS.
HARDWARE CLOTH
ON WIRE FENCE
SEDIMENT CONTROL STONE
ON TOP OF FILTER FABRIC
(MIRAFI 70OX OR APPROVED EQUAL)
SEDIMENT CONTROL STONE
ON TOP OF FILTER FABRIC
(MIRAFI 70OX OR APPROVED EQUAL)
CROSS SECTION
MAINTENANCE NOTES:
1. FILTER BARRIERS SHALL BE INSPECTED BY THE
FINANCIALLY RESPONSIBLE PARTY OR HIS
AGENT IMMEDIATELY AFTER EACH RAINFALL AND
AT LEAST DAILY DURING PROLONGED RAINFALL.
ANY REPAIRS NEEDED SHALL BE MADE
IMMEDIATELY.
2. SHOULD THE FABRIC DECOMPOSE OR BECOME
INEFFECTIVE PRIOR TO THE END OF THE
EXPECTED USABLE LIFE AND THE BARRIER STILL
IS NECESSARY, THE FABRIC SHALL BE REPLACED
PROMPTLY.
3. SEDIMENT DEPOSITS SHOULD BE REMOVED
AFTER EACH STORM EVENT OR SILT FENCE
SHOULD BE REPLACED. THEY MUST BE REMOVED
WHEN DEPOSITS REACH APPROXIMATELY HALF
THE HEIGHT OF THE BARRIER. ANY SEDIMENT
DEPOSITS REMAINING IN PLACE AFTER THE SILT
FENCE IS REMOVED SHALL BE DRESSED TO
CONFORM TO THE EXISTING GRADE, PREPARED
AND SEEDED.
GENERAL NOTES:
1.
FILTER FABRIC FENCE SHALL BE A MINIMUM OF
32" IN WIDTH AND SHALL HAVE A MINIMUM OF 6
LINE WIRES WITH 12" STAY SPACING.
2.
WOVEN FILTER FABRIC BE USED WHERE SILT
FENCE IS TO REMAIN FOR A PERIOD OF MORE
THAN 30 DAYS.
3.
STEEL POSTS SHALL BE 5'-0" IN HEIGHT AND BE
OF THE SELF -FASTENER ANGLE STEEL TYPE.
4.
BURY SKIRT WITH COMPACTED SOIL.
5.
TURN SILT FENCE UP SLOPE AT ENDS.
?
6.
WHEN FABRIC IS USED WITH WIRE MESH 8'
CENTERED POSTS MAY BE USE.
NOTES
1. TEMPORARY LINING C75BN, C125BN, P300 SHALL
BE NORTH AMERICAN GREEN OR APPROVED
EQUAL.
2. STRAW SHALL BE TACKED DOWN WITH SPRAYED
TACK COAT.
3. SEE WATTLE DETAIL FOR WATTLE SPACING.
SILT FENCE
O
J
LL
"w"
SEE CHART
HARDWARE CLOTH j
ON WIRE FENCE
HARDWARE CLOTH
SILT FENCE STONE OUTLET
WOVEN FILTER FABRIC
TEMPORARY SILT FENCE
DRAINAGE CHANNEL WIDTH LEFTSIDE RIGHTSIDE DEPTH
CHANNEL AREA C 02 010 SLOPE B SLOPE SLOPE FT TEMPORARY PERMANENT
ID ACRES CFS CFS FT/FT FT c c d LINING LINING
TD-1
4.50
0.6
14.88
1906.
0.0100
1
2
2
2.0
S75
GRASS
TD-2
4.00
0.6
16.20
2076.
0.0100
1
2
2
2.0
S75
GRASS
TD-3
0.50
0.6
1.65
2.12
0.0900
0
3
3
1.0
S75
GRASS
TD-4
0.25
0.6
0.83
1.06
0.0900
0
3
3
1.0
S75
GRASS
TD-5
5.50
0.6
18.18
23.30
0.0150
0
2
2
2.0
S75
GRASS
TD-6
0.30
0.6
0.99
1.27
0.0650
0
3
3
1.0
S75
GRASS
TD-7
5.00
0.6
19.51
24.90
0.0500
0
2
2
2.0
SC150
GRASS
TD-8
1.20
0.6
3.97
5.08
0.0100
0
3
3
1.5
S75
GRASS
TD-9
0.30
0.6
0.99
1.27
0.0100
0
3
3
1.0
S75
GRASS
TD-10
2.00
0.6
6.61
8.47
0.0500
0
3
3
1.0
S75
GRASS
TD-11
0.25
0.6
0.83
1.06
0.0200
0
3
3
1.0
S75
GRASS
TD-12
1.20
0.6
3.97
5.08
0.0700
0
3
3
1.0
S75
GRASS
T
TD-14
0.30
0.6
0.99
1.27
0.0300
0
3
3
1.0
S75
GRASS
TD-15
0.40
0.6
1.32
1.69
0.0200
0
3
3
1.0
S75
GRASS
TD-18
0.60
0.6
1.98
2.54
0.0150
0
3
3
1.0
S75
GRASS
TD-17
1.20
0.6
3.97
5.08
0.0150
0
3
3
1.0
S75
GRASS
TD-18
0.90
0.6
2.98
3.81
0._00
0
3
3
1.0
S75
GRASS
TD-19
1.00
0.8
3.31
4.24
0.0150
0
3
3
1.0
S75
GRASS
TD-20
0.25
0.6
0.83
1.06
0. 0400
0
3
3
1.0
S75
GRASS
DIVERSION DITCH
FRONT VIEW
STEEL POST
SILT FENCE
1 FT. OVERLAP SILT FENCE
AND HARDWARE CLOTH
(W) WIDTH OF OPENINGS
FOR SILT FENCE OUTLETS:
WIDTH DRAINAGE AREA
4 FT 1 AC.
6 FT 2 AC.
8 FT 3 AC.
10 FT 4 AC.
STEEL POST
WOVEN FILTER FABRIC
to Z
_
z�-
N � LU
Lu
0Q
N J co
LL LL
5N
III III -
ANCHOR SKIRT
4" MIN. WIDTH
VARIABLE AS DIRECTED BY THE ENGINEER
(6'MAX- SEE GENERAL NOTE 6.1
(USE WITH RIP RAP)
Y
U
O
U)
I-
cl�
z
OI.-
w
2
w
O
U
}
o
z
FL
5
z
cn
�4
O
0
U
w
in
w
Q
0
0
z
uj
_
Q
w
`L
a
cn
0
0
w
w
Ln
0
>
>
m
U
N
HN
O
N
V
CV
O
z
-
N
IPROJECT #: 2020-0001 DATE: 12/1/2020 I
DRAWN BY: JAC CHECKED BY: JAC
TITLE
EROSION CONTROL
DETAILS
SHEET
c-3.9
a

w
G'
Q
U
rn
3
ai
0
L
c
0
0
o_
m
I
O
00
I
U
U)
a
a)
C
a
0
0
Q
0
a�
rn
U)
a�
ri
I
a
E
I
0
O
0
I
0
cV
O
cV
O
N
0
(V
U
a�
O
0_
/
J
Co
/
�p �• pi P-i i / //jam /\ / /� / � -
---
/
PLOP: CHE KiSAMS
RIP RAP APPRON
/ �//
100-YEAR STORM DESIGN
%��
/ B44 - - / ° / ' /
845-
\ a '
A PE-104zz
� a
men
g41
843
860 -
855 -
850 -
845 -
1' F
840 -
835 -
830
p
00
/
/
/
/
--- - _ -TT-�
0
EX.
GROUND
/
STORM WATER ELEV.
/
1-YR 845.76
2-YR 846.28
10-YR 847.40
25-YR 847.78
50-YR 848.00
100-YR 848.18
0
12' WID
EMERGENCY
a5
o ``' C logo
y HA
DWHEE
W/ LOC
ING PLATE
/
TRASH
RAC
TOP E49.00
i U
z
ANTI
VORTEX
PLATE
n CD
^
0
o Z
0
o
1 - 3
" X 6" ORIFICE
EL
V. 846.00
LU
2 >
�z
3.51,
IA. ORIFICE
ELEV
842.50
�06
C
/
SPIL
WAY ELEV.
843.0
U)
F
>
/
'VEGETATIVE
SH
LF
PERM
NENT POOL
ELEV.
842.50
IGH WITH V TOP WIDTH
ROCK CHECK DAMS
I
BOTTOM
OF PON
D ELEV. E39.00
F
REBAY
\
/72.4
LF
DF
in
MAIN PC
ND
\
3
" RCP @
0.50%
1.5% SLOPE
6" SEDIMENT
STORAGE
BOTTOM
F REB
" EMERG
ENCY DRAIN
DEPTH
W/ CONC.
12'
FACE
- #57 STONE
O
ON
8'
NCHOR
GATE V
ND BAR
LVE
SCREEN
CLASS
RIP RA
HA
AD
4DWHEEI.
EQU TESUPPOMS
6' X l'AiiJTIFLOATION
STEM WITH
F
LTER FA13RIC
RIP
RAP APRON
TX
' X 6"
6'
BLOCK
ANTI E
EEP COLLARS
CO
00
Co 00
p CD
O
00 00
CD M
CDO
00 00
Cl)
00 00
1+00
d�
1+50
-i
- 860
855
GRAPHIC SCALE
0 10' 20' 40'
( IN FEET )
HORIZONTAL 1 inch = 20 ft.
POST
POST
POST
PRE
36" RCP
EMGY SPILL
TOTAL
STOIZI
CFS
CFS
CFS
CFS
10-Y
21.58
21.53
0.00
21.53
25-Y
32.69
50.22
4.72
50.22
50-Y
42.12
62.24
11.30
73.54
100-Y
52.43
77.62
17.91
95.53
850
- 845
- 840
( ELEV.1338.75
- 835
GRAPHIC SCALE
0 1' 2' 4'
0 10' 20' 40'
( IN FEET )
VERTICAL 1 inch = 4 ft.
HORIZONTAL 1 inch = 20 ft.
North
ij.
alina-_
1. CONTRACTOR IS FULLY RESPONSIBLE FOR CONTACTING
APPROPRIATE PARTIES AND ASSURING THAT EXISTING UTILITIES
ARE LOCATED PRIOR TO BEGINNING CONSTRUCTION.
2. CONTRACTOR IS RESPONSIBLE FOR PLACING BARRICADES USING
FLAG MEN, ETC., AS NECESSARY TO INSURE SAFETY.
3. ALL PAVEMENT CUTS, CONCRETE OR ASPHALT, ARE TO BE
REPLACED ACCORDING TO STANDARDS OF THE NORTH CAROLINA
DEPARTMENT OF TRANSPORTATION AND LOCAL MUNICIPALITIES.
4. SHORING WILL BE ACCORDING TO OSHA TRENCHING STANDARDS
PART 1926 SUBPART P, OR AS AMENDED.
Ln Co g
00 05 N O -
^111.-4 z'oEiiiii
F+'1 WW �C
cn
Czz
W 1
x
.,;; -%\A CAR.,
whq N A9941000 401
. L'21
Y
U
w
U
H
O
z
5
w
0
0
z
z
o
�
�
W
U
U
Z)
z
z
O
U)
w
w
w
FCN
N
N
Lo
N
A
N
N
7
0)
')
N
M
IPROJECT #: 2020-0001. DATE: 12/1/2020 I
DRAWN BY: JAC CHECKED BY: JAC
TITLE
SWCM 1 PLAN AND
PROFILE
SHEET
C-8.0
m

w
J
m
m
In
O
ai
0
0
N
CONCRETE
SPILLWAY
WEEP HOLES
4" THK. CONCRETE (3000
PSI @ 28 DAYS) REINFORCE
WITH W6.5 WWF @ 6" O.C.
BOTH WAYS TO TOE OF SLOPE ! I o
/1 Q
3 CO w
11 EXTEND TO VIRGIN GROUND 1 I w
JON-WOVEN GEOTEXTILE UNDER
STONE EQUIV. TO MIRAFI 140N.
SPILLWAY PROFILE SECTION
NTS
12'
ELEV. 847.50
�r-ter ki •r
rr Mr -r r �M,
4" WASHED STONE
PROVIDE 3 WEEP HOLES
ON EXIT END
ow
L
J
u
0
0
OD
z
(n J
M
TYPICAL 36SECTION
SYMBOL COUNT PLANT NAME
87
ASCLEPIAS INCAMATA'SWAMP MILKWEED'; 4 CUBIC INCH CONTAINER
ELEV. 849.00
87
CHELONE GLABRA'WHITE TURTLEHEAD'; 4 CUBIC INCH CONTAINER
87
EUPATORIADELPHUS MACU LATUS 'SPOTTED TRUMPETWEED; 4 CUBIC INCH CONTAINER
A&
87
HIBISCUS COCCINEUS 'SCARLET ROSE MALLOW; 4 CUBIC INCH CONTAINER
88
LOBELIA CARDINALIS 'CARDINAL FLOWER'; 4 CUBIC INCH CONTAINER
4" THK. CONCRETE
(3000 PSI @ 28 DAYS)
REINFORCE WITH W6.5
88
LOBELIA SIPHILITICA 'GREATE BLUE LOBELIA'; 4 CUBIC INCH CONTAINER
WWF @ 6" O.C. BOTH WAYS
air
GENERAL NOTES:
1. TOPS OF BERMS AND EXTERIOR SLOPES SHALL BE PLANTED PER
PERMANENT SEEDING SCHEDULE.
2. PLANT SELECTION, SIZE, AND QUANTITY MAY VARY BASED ON ACTUAL
CONDITIONS, PLANT AVAILABILITY, AND COST FACTORS.
3. PLANTS SHALL BE SPACED APPROXIMATELY 24".
4. ALL PLANT SHALL HAVE A 2 YEAR WARRANTY PERIOD FROM TIME OF
PLANTING.
12" DEEP x 8" WIDE CONCRETE
KEY AT FRONT AND BACK OF SPILLWAY
REINFORCE WITH ONE NO. 3 BAR
CAST WITH 4" SLAB OR PROVIDE DOWELS
NON -WOVEN GEOTEXTILE UNDER
STONE EQUIV. TO MIRAFI 140N. PROPOSED WET DETENTION LITORAL SHELF PLANTING & GRASSING
DETAIL
SPILLWAY CROSS SECTION
NTS
TOP OF FOREBAY WEIR
WOVEN GEOTEXTILEv�� `
EQUIVALENT TO MIRAFI 500X.
FOREBAY SPILLWAY SECTION CROSS SECTION
NTS
8" DIP
EMERGENCY DRAIN
,.GREEN
TRASH RACK
SEE DETAIL
2"X2"X 1 /4"
ANGLE (TYP.`
1/2"0 REBAR
TRASH RACK
12"
12"
FAI
5 FT X 5 FT CONCRETE RISER
(4 FT X 4 FT INSIDE)
TOP ELEV. 847.00
W/TRASH RACK
3.5" ORI
8z
36" BARREL 01
ELEV. 838.
TOP OF RISER
--VORTEX PLATE
RISER DETAIL
NTS
36" W x 6" H ORIFICE
6.00
ROVIDE STEPS PER
CDOT 840.66)
6'X6'X1'
CONCRETE ANCHOR
4" PVC SCREW
TYPE PLUG
2.5" ORIFICE DRILLED
INTO 4" END CAP
�1 I� 6" 6"
JOINTS SHALL BE SEALED
WITH MASTIC CAULK. INSIDE
JOINTS SHALL BE GROUTED. ,
CONCRETE ANCHOR
SECTION A -A
PRECAST CONCRETE RISER
SECTIONS
PROVIDE 5 STEPS
(NCDOT 840.66)
CONCRETE KEYWAY
ANTI -VORTEX PLATE
BOLTED TO CONCRETE RISER
ENTIRE ASSEMBLY SHALL
BE GALVANIZED OR
ALUMINUM.
SHOP DRAWINGS SHALL BE
SUBMITTED TO ENGINEER
FOR REVIEW & APPROVAL.
TECHNICAL SPECIFICATIONS:
1. SUBGRADE FOR DAM TO BE PROOF ROLLED PRIOR TO EARTH FILL
PLACEMENT. ANY SOFT OR PUMPING AREAS ARE TO BE UNDERCUT
AND REPLACED WITH COMPACTED EARTH FILL.
2 COMPACTED EARTH FILL TO HAVE DRY UNIT WEIGHT OF AT LEAST 90
PCF. ALL EARTH FILL TO BE COMPACTED TO MINIMUM OF 95% OF STD.
PROCTOR MAXIMUM DRY DENSITY.
3. EXCAVATED SIDE SLOPES TO BE STABILIZED WITH GRASS COVER IN
ACCORDANCE WITH SEEDING SPECIFICATIONS FROM EROSION &
SEDIMENT CONTROL PLAN.
4. FINAL DAM EMBANKMENT SLOPES TO BE TRACKED AND STABILIZED
WITH GRASS COVER IN ACCORDANCE WITH SEEDING SPECIFICATIONS
FROM EROSION & SEDIMENT CONTROL PLAN.
5. REINFORCED CONCRETE RISER STRUCTURE TO BE PREFABRICATED 4
FT. x 4 FT. INTERIOR DIMENSIONS.
6. ANTI -SEEP COLLARS FOR DISCHARGE PIPE SHALL HAVE WATERPROOF
CONNECTION TO DISCHARGE PIPE.
7. SHOP DRAWINGS FOR ALL APPURTENANCES (I.E., GATE VALVE,
HANDWHEEL, ETC.) SHALL BE SUBMITTED TO ENGINEER FOR REVIEW
AND APPROVAL.
8. IF REQUIRED, 12" CLAY LINER TO BE RECOMPACTED CLAYEY SOIL
MATERIAL. THE LINER SHALL HAVE A MAXIMUM INFILTRATION RATE OF
0.01 IN/HR. CLAY SHALL BE PLACE IN 2 LIFTS WITH DEEP PENETRATING
SHEEPSFOOT ROLLER (CAT 815 OR EQUAL) TO MINIMUM COMPACTION
OF 98% STANDARD PROCTOR MAXIMUM DRY DENSITY.
North
Carnlina__:.�
1. CONTRACTOR IS FULLY RESPONSIBLE FOR CONTACTING
APPROPRIATE PARTIES AND ASSURING THAT EXISTING UTILITIES
ARE LOCATED PRIOR TO BEGINNING CONSTRUCTION.
2. CONTRACTOR IS RESPONSIBLE FOR PLACING BARRICADES USING
FLAG MEN, ETC., AS NECESSARY TO INSURE SAFETY.
3. ALL PAVEMENT CUTS, CONCRETE OR ASPHALT, ARE TO BE
REPLACED ACCORDING TO STANDARDS OF THE NORTH CAROLINA
DEPARTMENT OF TRANSPORTATION AND LOCAL MUNICIPALITIES.
4. SHORING WILL BE ACCORDING TO OSHA TRENCHING STANDARDS
PART 1926 SUBPART P, OR AS AMENDED.
41
a �
= 3IN16
zs FNGINE�`..'��;;
••
'`4y 4f N 0, GPI• 21
z
0
cn
z
w
O
U
z
O
I-
0-1
a
y
U
oa
N
�
Q
N
v
O
z
PROJECT #: 2020-0001 DATE: 12/1/2020
DRAWN BY: JAC CHECKED BY: JAC
TITLE
SWCM 1 DETAILS
0
a-
J
m
CU
DRAIN PIPE ANCHOR
NTS
BAR SCREEN TRASH RACK
NTS
ORIFICE DETAIL
NTS
RISER TRASH RACK
NTS
SHEET
C-8.1

w
G'
Q
U
3
O
L
c
0
0
o_
m
I
(D
C6
I
U
U)
a
a)
C
a
0
0
Q
0
a�
rn
U)
Q
ri
I
a)
rn
a
E
I
0
O
0
I
0
N
O
N
/
O
N
0
N
U
N
O
0_
/
J
Co
/
/ co
0 a
/
` \ N
1 875 -
E�Z�1c
1 865 -
1 855 -
E��1c
1 845 -
1 840 -
° o
/ I a
/
/ 1
/ 7 /
DI-50856
PE-4 / - - _ / / /
in
00
- C
n _
<862//_
861
IX
- - PROP. CHECK DAMS _\�_-- ---
G-1-�-------- - 50 o - 8 S
$ RIP D- RIP/RAP --1 �✓- --- 49 _
100-YE7 STORM DESIGN
GRAPHIC SCALE
0 10' 20' 40'
( IN FEET )
HORIZONTAL I inch = 20 ft.
ROP.GR
UND
O
O
i
i
3i In
N
i
+ O
N Co
60
/
/
w
-
/
/
EX. GROUND
owl
STORM WATER ELEV.
/
/
1-YR 857.69
2-YR 858.07
10-YR 859.50
25-YR 860.43
50-YR 860.79
100-YR 861.01
/
/
/
/
0
O
Lo
/
12'WIDE
EMERGENCY
ao 10
HAN
WHEEL
/ LOCKING
PLATE
p
TRASH
RACK
3
"RCP @
.51%
TOP
862.00
Co
c~n
z
ANTI VORTEX
P
TE
/
1 - 30"
X 12" ORIF
ICE ELE
. 857.50
J
/
o
00
2.5"
DIA. ORIFICE
ELEV
854.50
Cl)
0)
00 to
N cM 00
00
/
PILLWA
ELEV. 8
5.00
+ °00
N o
Z p
C)M
p N m
/
U Cn
of
ZZ
CO/
o+ 000 Z
-
6'
VEGETA
IVE SHE
F
V HIGH
WITH 1' TOP
WIDTH
U)
U
P _
cn of z
/
ROCK CHECK
DAMS
/
FOREB
Y
2 LF OF
1.5% SLOPE
/
24"
RCP
°
" SEDIMENT
ST
AG
BOTTOM
OF FOREBAY
ELEV. 85
.75
8"
EMERGENCY
DRAIN
W/ CO
C.
12"
- #57 ST
NE ON
ANCHOR
AlD
BARSCREEN
CLASS B
RIP RAP
TX TX
6"
HAND
HEEL STEM
WITH
FI
TER FABRIC
RIP
RAP APRON
ANTI SEE
COLLARS
6'
6' X V A
TIFLOAT
ON BLO
K
18 PVC
M
It
Lo Il-
N
00 Lo M
00
O O
cfl
Ch N
00
CD
C�
CN 00rl-
00 00
O M"t
O�
C0
00 00
O
C?It
m
00 00
Lo
O
00
0+00
0+50
1+00
1+50
2+00
2+50
- 880
- 875
- 870
POST POST POST
PRE
24" RCP
EMGY SPILL
TOTAL
STORM
CFS
CFS
CFS
CFS
10-YR
16.09
15.03
0.00
15.03
25-YR
24.30
22.20
0.00
22.20
50-YR
31.28
35.85
4.93
40.78
100-YR
38.93
47.34
11.84
59.18
865
- 860
- 855
- 850
- 845
- 840
c
GRAPHIC SCALE 1. CONTRACTOR IS FULLY RESPONSIBLE FOR CONTACTING
0 1' 2' 4' APPROPRIATE PARTIES AND ASSURING THAT EXISTING UTILITIES
0 10 20' 40' ARE LOCATED PRIOR TO BEGINNING CONSTRUCTION.
2. CONTRACTOR IS RESPONSIBLE FOR PLACING BARRICADES USING
FLAG MEN, ETC., AS NECESSARY TO INSURE SAFETY.
3. ALL PAVEMENT CUTS, CONCRETE OR ASPHALT, ARE TO BE
( IN FEET) REPLACED ACCORDING TO STANDARDS OF THE NORTH CAROLINA
VERTICAL I inch = 4 ft. DEPARTMENT OF TRANSPORTATION AND LOCAL MUNICIPALITIES.
HORIZONTAL I inch = 20 ft. 4. SHORING WILL BE ACCORDING TO OSHA TRENCHING STANDARDS
PART 1926 SUBPART P, OR AS AMENDED.
--�Ln�E�
H F N
~ N
Cr �
z 'o E i�
W W ;
to-
x
zz
O
I"
It
a�,(I`IHIIIIH//R
916 r
s•,,'l� �NGI NE�`P�'��o``
CD
0
Y
U
W
2
U
H
0
z
o
5
w
0
0
z
z
0
2
2
w
U
U
Z)
z
z
p
0
0
u)
w
a
a
FN
N
N
Lo
N
A
N
7
0')N
z
N
M
O
z
a
a
IPROJECT #: 2020-0001. DATE: 12/1/2020 I
DRAWN BY: JAC CHECKED BY: JAC
TITLE
SWCM 2 PLAN AND
PROFILE
SHEET
C-g.2

or
w
J
m
m
In
O
ai
0
CONCRETE
SPILLWAY
09. ,KAKI
WEEP HOLES
4" THK. CONCRETE (3000
PSI @ 28 DAYS) REINFORCE
WITH W6.5 WWF @ 6" O.C.
BOTH WAYS TO TOE OF SLOPE I o
Q
3 I co w
0
LU
1 EXTEND TO VIRGIN GROUND >
JON-WOVEN GEOTEXTILE UNDER
STONE EQUIV. TO MIRAFI 140N.
SPILLWAY PROFILE SECTION
NTS
12'
ELEV. 865.50
y
�r--�r-
�r-�r-•r��
rr- �r--r- r-���
4" WASHED STONE
PROVIDE 3 WEEP HOLES
ON EXIT END
ow
L
J
U
0
0
i
z
(n J
M
TYPICAL 35' SECTION
SYMBOL COUNT PLANT NAME
77
ASCLEPIAS INCAMATA'SWAMP MILKWEED'; 4 CUBIC INCH CONTAINER
ELEV. 867.00
77
CHELONE GLABRA'WHITE TURTLEHEAD'; 4 CUBIC INCH CONTAINER
76
EUPATORIADELPHUS MACU LATUS 'SPOTTED TRUMPETWEED; 4 CUBIC INCH CONTAINER
Mw
76
HIBISCUS COCCINEUS 'SCARLET ROSE MALLOW; 4 CUBIC INCH CONTAINER
76
LOBELIA CARDINALIS 'CARDINAL FLOWER'; 4 CUBIC INCH CONTAINER
4" THK. CONCRETE
(3000 PSI @ 28 DAYS)
REINFORCE WITH W6.5
76
LOBELIA SIPHILITICA 'GREATE BLUE LOBELIA'; 4 CUBIC INCH CONTAINER
WWF @ 6" O.C. BOTH WAYS
ale
GENERAL NOTES:
1. TOPS OF BERMS AND EXTERIOR SLOPES SHALL BE PLANTED PER
PERMANENT SEEDING SCHEDULE.
2. PLANT SELECTION, SIZE, AND QUANTITY MAY VARY BASED ON ACTUAL
CONDITIONS, PLANT AVAILABILITY, AND COST FACTORS.
3. PLANTS SHALL BE SPACED APPROXIMATELY 24".
4. ALL PLANT SHALL HAVE A 2 YEAR WARRANTY PERIOD FROM TIME OF
PLANTING.
12" DEEP x 8" WIDE CONCRETE
KEY AT FRONT AND BACK OF SPILLWAY
REINFORCE WITH ONE NO. 3 BAR
CAST WITH 4" SLAB OR PROVIDE DOWELS
NON -WOVEN GEOTEXTILE UNDER
STONE EQUIV. TO MIRAFI 140N. PROPOSED WET DETENTION LITORAL SHELF PLANTING & GRASSING
DETAIL
SPILLWAY CROSS SECTION
NTS
TOP OF FOREBAY WEIR
WOVEN GEOTEXTILEv�� `
EQUIVALENT TO MIRAFI 500X.
FOREBAY SPILLWAY SECTION CROSS SECTION
NTS
2'-0"
0
N
8" DIP
EMERGENCY DRAIN
,.GREEN
TRASH RACK
SEE DETAIL
2"X2"X 1 /4"
ANGLE (TYP.`
1/2"0 REBAR
TRASH RACK
12"
12"
5 FT X 5 FT CONCRETE RISER
(4 FT X 4 FT INSIDE)
TOP ELEV. 865.00
W/TRASH RACK
2.5" ORI
8!
24" BARREL 01
ELEV. 854.
TOP OF RISER
--VORTEX PLATE
RISER DETAIL
NTS
24" W x 6" H ORIFICE
3.50
ROVIDE STEPS PER
CDOT 840.66)
6'X6'X1'
CONCRETE ANCHOR
4" PVC SCREW
TYPE PLUG
2.5" ORIFICE DRILLED
INTO 4" END CAP
�1 I� 6" 6"
JOINTS SHALL BE SEALED
WITH MASTIC CAULK. INSIDE
JOINTS SHALL BE GROUTED. ,
CONCRETE ANCHOR
SECTION A -A
PRECAST CONCRETE RISER
SECTIONS
PROVIDE 5 STEPS
(NCDOT 840.66)
CONCRETE KEYWAY
ANTI -VORTEX PLATE
BOLTED TO CONCRETE RISER
ENTIRE ASSEMBLY SHALL
BE GALVANIZED OR
ALUMINUM.
SHOP DRAWINGS SHALL BE
SUBMITTED TO ENGINEER
FOR REVIEW & APPROVAL.
TECHNICAL SPECIFICATIONS:
1. SUBGRADE FOR DAM TO BE PROOF ROLLED PRIOR TO EARTH FILL
PLACEMENT. ANY SOFT OR PUMPING AREAS ARE TO BE UNDERCUT
AND REPLACED WITH COMPACTED EARTH FILL.
2 COMPACTED EARTH FILL TO HAVE DRY UNIT WEIGHT OF AT LEAST 90
PCF. ALL EARTH FILL TO BE COMPACTED TO MINIMUM OF 95% OF STD.
PROCTOR MAXIMUM DRY DENSITY.
3. EXCAVATED SIDE SLOPES TO BE STABILIZED WITH GRASS COVER IN
ACCORDANCE WITH SEEDING SPECIFICATIONS FROM EROSION &
SEDIMENT CONTROL PLAN.
4. FINAL DAM EMBANKMENT SLOPES TO BE TRACKED AND STABILIZED
WITH GRASS COVER IN ACCORDANCE WITH SEEDING SPECIFICATIONS
FROM EROSION & SEDIMENT CONTROL PLAN.
5. REINFORCED CONCRETE RISER STRUCTURE TO BE PREFABRICATED 4
FT. x 4 FT. INTERIOR DIMENSIONS.
6. ANTI -SEEP COLLARS FOR DISCHARGE PIPE SHALL HAVE WATERPROOF
CONNECTION TO DISCHARGE PIPE.
7. SHOP DRAWINGS FOR ALL APPURTENANCES (I.E., GATE VALVE,
HANDWHEEL, ETC.) SHALL BE SUBMITTED TO ENGINEER FOR REVIEW
AND APPROVAL.
8. IF REQUIRED, 12" CLAY LINER TO BE RECOMPACTED CLAYEY SOIL
MATERIAL. THE LINER SHALL HAVE A MAXIMUM INFILTRATION RATE OF
0.01 IN/HR. CLAY SHALL BE PLACE IN 2 LIFTS WITH DEEP PENETRATING
SHEEPSFOOT ROLLER (CAT 815 OR EQUAL) TO MINIMUM COMPACTION
OF 98% STANDARD PROCTOR MAXIMUM DRY DENSITY.
North
Carnlina__:.�
1. CONTRACTOR IS FULLY RESPONSIBLE FOR CONTACTING
APPROPRIATE PARTIES AND ASSURING THAT EXISTING UTILITIES
ARE LOCATED PRIOR TO BEGINNING CONSTRUCTION.
2. CONTRACTOR IS RESPONSIBLE FOR PLACING BARRICADES USING
FLAG MEN, ETC., AS NECESSARY TO INSURE SAFETY.
3. ALL PAVEMENT CUTS, CONCRETE OR ASPHALT, ARE TO BE
REPLACED ACCORDING TO STANDARDS OF THE NORTH CAROLINA
DEPARTMENT OF TRANSPORTATION AND LOCAL MUNICIPALITIES.
4. SHORING WILL BE ACCORDING TO OSHA TRENCHING STANDARDS
PART 1926 SUBPART P, OR AS AMENDED.
PROJECT #: 2020-0001 DATE: 12/1/2020
DRAWN BY: JAC CHECKED BY: JAC
TITLE
SWCM 2 DETAILS
0
a-
J
m
CU
DRAIN PIPE ANCHOR
NTS
BAR SCREEN TRASH RACK
NTS
ORIFICE DETAIL
NTS
RISER TRASH RACK
NTS
SHEET
C-8.3

Lv
I-
D'
Q
U
3
0
L
c
0
0
o_
D_
m
I
O
00
1
U
U)
a
a)
a
o_
0
0
Q
0
/
rn
U)
a�
I
a�
rn
a
E
Co
I
O
O
0
I
0
N
O
N
1-1
N
0
N
/
U
A
0
O_
/
J
Co
835�
\QO
O\¢\ .\ CH\\E
�C'\K\\\ DAMS
AMS
�� MIN 2,105 SF OF SAND AREA
00A\P\P\R\ \O
- EAP S OR
\\\
`\V
a \\
C
AB-
4 � AID \ � _,� I I � I I \ •.1•� ", �•I � a• \• V AV � � \ \ /// I A � I 1 � -
° Io / \ \ \ / o I I I o • �� • I r � CS \ \ � I / \ I /
\ \ \ \ \ III \ ; \ I \ ••�.• 1•r �, •��. \ \� \ \ \ GRAPHIC SCALE
I 11 I
I \II\ P \\ \\\� II 1 0 �� - - / I I / 11 r •.t• •r : 1 •1•.•1I; I 'I \ I II 0 10' 20' 40'
I I \ '\\\\\\ 1III \ ' \ I � 1•• '1•I�1 •I 1• � I �� I \\ I I � � \ --- -\
\ \1 I \ \ I .1•L �• .l.
I
IN FEET )
-44
l
I \
0
o
1 850 -
1 845 -
840 -
M 1911t
1 825 -
i
ANTI-VORTEX PLATE
BOLTED TO CONCRETE RISER
RISER TRASH RACK
\ 5 FT X 5 FT CONCRETE RI
HORIZONTAL 1 inch = 20 ft. (4 FT X 4 FT INS
TOP ELEV. 84
W/ TRASH R,
/ I /
- �
STORM WATER ELEV.
1-YR 840.05
2-YR 840.59
10-YR 842.01
25-YR 842.51
50-YR 842.76
100-YR 842.95
0
m CV7
Co
PROP.
GROUN
@ CL
o
Lo M
\
SPILLWAY
ELIE
V. 842.25
>
3
"x6" ORI
ICE ELEV.
839.50
\
10'i
/
-
(1
WINDOW)
AX PON
ING
1.7 LF O
30" RCP
@ 0.51%
0
o
0
/
2.5" DIA. 11
RIFICE
LEV. 83
.00
of
(p
o
N
Lo
W/ TRAS11
RACK
6" C
EANOU
1' HIGH
WITH V TOP
ROCK CHECK
WIDTH
DAMS
o�Z
RAP
APRON
Co
U
Co ER
>
z
/
LjRIP
55.9 LF
F
RI
RAP BE
M
MIN.
1.5 FT CLEANED
ASHED
ONCRE
E
\
w
12" JE57
STON
E WRAPPED
IN F
LTER FABRIC
PPROX.
SHWT EL
EV. 832.13
6"
PVC PER FORATED
UNDERDRAIN
RIP RAP
APRON
6
0' X 6.0'
6"
5' X 5'
V ANTIF
OATION
BLOCK
ANTI
SET! COLLAR
3
N
CO
00
07
00
00
CD
00 OD
CD 00
00
00 00
N
(.0
00
-0+50 0+00
0+50 1+00
1+50 2+00
- 855
- 850
- 845
POST POST POST
PRE
18" RCP
EMGY SPILL
TOTAL
STORM
CFS
CFS
CFS
CFS
10-YR
18.66
18.09
0.00
18.39
25-YR
24.93
21.28
4.91
26.52
50-YR
30.00
21.70
13.58
35.62
100-YR
35.36
22.02
21.83
44.20
- 840
- 835
- 830
- 825
2+50
36" W x 6" H ORIFI(
839.
(1 WINDO)
2.5" ORIFI(
838.1
18" BARREL OUT
835.49
NTS
"'TI-VORTEX PLATE
VIDE STEPS PER
)OT 840.66)
TECHNICAL SPECIFICATIONS:
1. SUBGRADE TO BE PROOF ROLLED PRIOR TO EARTH FILL PLACEMENT. ANY SOFT OR PUMPING
AREAS ARE TO BE UNDERCUT AND REPLACED WITH COMPACTED EARTH FILL.
2 COMPACTED EARTH FILL TO HAVE DRY UNIT WEIGHT OF AT LEAST 90 PCF. ALL EARTH FILL TO BE
COMPACTED TO MINIMUM OF 95% OF STD. PROCTOR MAXIMUM DRY DENSITY.
3. EXCAVATED SIDE SLOPES TO BE STABILIZED WITH GRASS COVER IN ACCORDANCE WITH SEEDING
SPECIFICATIONS FROM EROSION & SEDIMENT CONTROL PLAN.
4. FINAL EMBANKMENT SLOPES TO BE TRACKED AND STABILIZED WITH GRASS COVER IN
ACCORDANCE WITH SEEDING SPECIFICATIONS FROM EROSION & SEDIMENT CONTROL PLAN.
5. REINFORCED CONCRETE RISER STRUCTURE TO BE PREFABRICATED 4 FT. x 4 FT. INTERIOR
DIMENSIONS.
JOINTS SHALL BE SEALE
WITH MASTIC CAULK. INSIE
JOINTS SHALL BE GROUTE
5'X5'X1'
CONCRETE ANCHOR
CONCRETE ANCHOR
RISER DETAIL
NTS
GRAPHIC SCALE
0 1' 2' 4'
0 10 20' 40'
( IN FEET )
VERTICAL 1 inch = 4 ft.
HORIZONTAL 1 inch = 20 ft.
Cl)
W
U
maX Wn
of
� LU 0 a
�Www�
W M
Q z Cl)
J J
U _ _ U)
C/)a
w
z U ^
O3:Rz
�LU<
r- d LL -
u')�O
O w
z
�I
I� 6„
6,
D
E
Lo
4,
SECTION A -A
I T r- IUML OCU I IUIV
- PRECAST CONCRETE RISER
SECTIONS
PROVIDE 5 STEPS
(NCDOT 840.66)
;ONCRETE KEYWAY
FILTER
FABRIC
(MIRAFI 140 N)
(ALL SIDES
OF SAND)
rcr-,rummTED
PIPE/GRAVEL
UNDERDRAIN
SYSTEM
NOTES:
1. "CONCRETE" SAND REFERS TO SAND THAT IS
COMMONLY USED IN CONCRETE MIXES.
2. ALL DRAINAGE AREAS TO A SAND FILTER FACILITY
ARE TO BE STABILIZED PRIOR TO INSTALLATION
OF SAND.
3. UNDERDRAIN PIPES SHOULD BE MIN. 6"
PERFORATED SCHEDULE 40 PVC (PER AASHTO
M278) OR DOUBLE WALL HDPE (PER AASHTO M252).
PERFORATIONS SHOULD BE %" SPACED 3" ON
CENTER ALONG 4 LONGITUDINAL ROWS SPACED
90° APART.
SAND FILTER CROSS-SECTION
NTS
' 1 , 0
1. CONTRACTOR IS FULLY RESPONSIBLE FOR CONTACTING
APPROPRIATE PARTIES AND ASSURING THAT EXISTING UTILITIES
ARE LOCATED PRIOR TO BEGINNING CONSTRUCTION.
2. CONTRACTOR IS RESPONSIBLE FOR PLACING BARRICADES USING
FLAG MEN, ETC., AS NECESSARY TO INSURE SAFETY.
3. ALL PAVEMENT CUTS, CONCRETE OR ASPHALT, ARE TO BE
REPLACED ACCORDING TO STANDARDS OF THE NORTH CAROLINA
DEPARTMENT OF TRANSPORTATION AND LOCAL MUNICIPALITIES.
4. SHORING WILL BE ACCORDING TO OSHA TRENCHING STANDARDS
PART 1926 SUBPART P, OR AS AMENDED.
a�,(I`IHIIIIH//R��
�=
30916 s
21
Y
U
w
m
U
m
H
0
z
o
�
w
W5
0
0
z
z
0
W
U
U
Z)
000
w
w
w
w
N
N
N
to
N
A
N
I'
0)
Z
N
M
PROJECT #: 2020-0001 DATE: 12/1/2020
DRAWN BY: JAC CHECKED BY: JAC
TITLE
SWCM 3 PLAN AND
PROFILE
SHEET
C-8.4
II

Lv
C'
Q
U
rn
3
0
L
c
0
0
o_
D_
m
I
0
00
I
U
U)
a
a)
,_
a
o_
0
0
Q
0
/
rn
U)
a�
I
a
E
1
0
0
O
I
O
N
O
N
O
N
O
N
U
N
O
Q_
/
J
Co
/
\\ I
/z���o v
X847.00 \ s�
61
/XIry
\ v A vV A
�o X 842.09 \ � P \
\
`\ II IIII ` � � \\ I � 1 \ I• � \\ \\ \
\ \ RIP RAP APPRON
\0- EAR STORM DESIGN \ \
x 7
CS-8 \
ANTI -VORTEX PLATE
BOLTED TO CONCRETE RISER
- - RISER TRASH RACK
NTS
\ MIN. 1,630 SF OF SAND AREA -
\ \ -J\
\\ 85 \ - d
3----
\ 852 - - - - �-
a
\ \ 851---
849\� ---
\ \ \ \ PROP. CHEC AMS
860 -
855 -
850 -
845 -
840 -
835 -
830 -
825 -
--
GRAPHIC SCALE
0 10' 20' 40'
( IN FEET )
HORIZONTAL 1 inch = 20 ft. 5 FT X 5 FT CONCRETE RI,
(4 FT X 4 FT INS
TOP ELEV. 84
W/ TRASH R,
STORM WATER ELEV.
1-YR 844.20
2-YR 844.59
10-YR 845.70
25-YR 846.22
50-YR 846.51
100-YR 846.78
EX. GROUND
CL
0
0
0
SPILLWA
Y ELEV.
46.50
;t
00/
/
4"x6" ORIFICE
EL
V. 844.
U) )
W
DIA. OR
FICE ELEV.
842.00
PROP.
GROUND
@ CL
10'
w
6"
LEANO
T
om
1.
00,
0.5' HIGH WITH
ROCK
V TOP
CHECK
WIDTH
DAMS
Co
U
/
/
RIP
RAP BERM
F OF
/
15" RCP
@ 0.50%
i
M
N 1.5 FT
:;LEANED
WASHED
CONCRETE
12'
#57 ST
NE WRA
PIED
IN
FILTER F
kBRIC
RIP RAP APRON
5' X 5'X
VANTIF
LOATION
BLOCK
6.0'X
ANTI
.0'X6"
EEP COI
I AIRS
APPROX.
SHWT
ELEV. 833.0
(7
Cn
CO
CD
M
00 00
~
It
00
CO
rl It
00 00
m
O) m
It
00 00
N
O)
00
0+00
1+00
1+50
2+00
2+50
24" W x 6" H ORIFI(
844.
(1 WINDO\
3" ORIFI(
842.1
15" BARREL OUT
839.25
- 860
- 855
- 850
POST POST POST
PRE
15" RCP
EMGY SPILL
TOTAL
STORM
CFS
CFS
CFS
CFS
10-YR
9.41
6.56
0.00
6.56
25-YR
13.56
12.60
0.00
12.94
50-YR
17.02
15.21
0.01
15.58
100-YR
20.77
15.53
5.63
21.52
- 845
- 840
- 835
- 830
- 825
"'TI-VORTEX PLATE
VIDE STEPS PER
)OT 840.66)
UX6'X1'
CONCRETE ANCHOR
RISER DETAIL
NTS
GRAPHIC SCALE
0 1' 2' 4'
0 1020' 40'
( IN FEET )
VERTICAL 1 inch = 4 ft.
HORIZONTAL 1 inch = 20 ft.
TECHNICAL SPECIFICATIONS:
1. SUBGRADE TO BE PROOF ROLLED PRIOR TO EARTH FILL PLACEMENT. ANY SOFT OR PUMPING
AREAS ARE TO BE UNDERCUT AND REPLACED WITH COMPACTED EARTH FILL.
2 COMPACTED EARTH FILL TO HAVE DRY UNIT WEIGHT OF AT LEAST 90 PCF. ALL EARTH FILL TO BE
COMPACTED TO MINIMUM OF 95% OF STD. PROCTOR MAXIMUM DRY DENSITY.
3. EXCAVATED SIDE SLOPES TO BE STABILIZED WITH GRASS COVER IN ACCORDANCE WITH SEEDING
SPECIFICATIONS FROM EROSION & SEDIMENT CONTROL PLAN.
4. FINAL EMBANKMENT SLOPES TO BE TRACKED AND STABILIZED WITH GRASS COVER IN
ACCORDANCE WITH SEEDING SPECIFICATIONS FROM EROSION & SEDIMENT CONTROL PLAN.
5. REINFORCED CONCRETE RISER STRUCTURE TO BE PREFABRICATED 4 FT. x 4 FT. INTERIOR
DIMENSIONS.
JOINTS SHALL BE SEALE
WITH MASTIC CAULK. INSIE
JOINTS SHALL BE GROUTE
CONCRETE ANCHOR
CM
W
U
=¢X WQ
� �o
¢_ ofz
WOQ
�Www�
W M
Qz2U
J o J
U _ _ U)
w
z U ^
O3:Rz
,
U)OQ
r- a LL _
U-)�ofLL
O w
z
�I
I� 6„
6,
D
E
).
Cn
N
4,
SECTION A -A
I T rIUML OCU I IUIV
- PRECAST CONCRETE RISER
SECTIONS
PROVIDE 5 STEPS
(NCDOT 840.66)
;ONCRETE KEYWAY
FILTER
FABRIC
(MIRAFI 140 N)
(ALL SIDES
OF SAND)
rCr,rur-,mTED
PIPE/GRAVEL
UNDERDRAIN
SYSTEM
NOTES-
1. "CONCRETE" SAND REFERS TO SAND THAT IS
COMMONLY USED IN CONCRETE MIXES.
2. ALL DRAINAGE AREAS TO A SAND FILTER FACILITY
ARE TO BE STABILIZED PRIOR TO INSTALLATION
OF SAND.
3. UNDERDRAIN PIPES SHOULD BE MIN. 6"
PERFORATED SCHEDULE 40 PVC (PER AASHTO
M278) OR DOUBLE WALL HDPE (PER AASHTO M252).
PERFORATIONS SHOULD BE %" SPACED 3" ON
CENTER ALONG 4 LONGITUDINAL ROWS SPACED
90' APART.
SAND FILTER CROSS-SECTION
NTS
N�rfh
8
1. CONTRACTOR IS FULLY RESPONSIBLE FOR CONTACTING
APPROPRIATE PARTIES AND ASSURING THAT EXISTING UTILITIES
ARE LOCATED PRIOR TO BEGINNING CONSTRUCTION.
2. CONTRACTOR IS RESPONSIBLE FOR PLACING BARRICADES USING
FLAG MEN, ETC., AS NECESSARY TO INSURE SAFETY.
3. ALL PAVEMENT CUTS, CONCRETE OR ASPHALT, ARE TO BE
REPLACED ACCORDING TO STANDARDS OF THE NORTH CAROLINA
DEPARTMENT OF TRANSPORTATION AND LOCAL MUNICIPALITIES.
4. SHORING WILL BE ACCORDING TO OSHA TRENCHING STANDARDS
PART 1926 SUBPART P, OR AS AMENDED.
N O
U C a
^� z"oEi�
F+'1 WW -,t 6 1
W a O 0
r a)
az
C+"
W 1
x
w W zz
O
1�
w9941,00
N N A11G
z'21
U
2
0
Y
U
w
U
2
H
2
0
z
o
�
5
w
0
0
z
z
0
w
U
U
Z)
z
z
O
U)
W
W
w
FN
N
N
Lo
N
A
C
N
Z
N
M
IPROJECT #: 2020-0001 DATE: 12/l/2020 I
DRAWN BY: JAC CHECKED BY: JAC
TITLE
SWCM 4 PLAN AND
PROFILE
SHEET
C-8.5
ME 1

w
G'
Q
U
3
ai
0
L
c
0
0
o_
D_
m
I
0
00
I
U
U)
a
a)
,_
a
o_
0
0
Q
U
/
a)
rn
U)
a�
I
a�
rn
a
E
I
0
0
O
I
0
N
0
N
0
N
0
N
U
N
O
Q_
/
J
Co
/
/
\
/ I
I \
I � \
ANTI -VORTEX PLATE
BOLTED TO CONCRETE RISER
i
48
/ \ ---- - 847 \ i
-� 846
/ 845 --- /
844 \- - - - - - - - -�
844 - - -
----------
-
-
843 - - I �
MIN. 810 OF SAND AREA
�
/
/
----
-�
� i
� -� 845- //
/ / / /
GRAPHIC SCALE
-
-
-- -
-842-
� I
- .•
I �\
/ -
�
`/ �
841
\�-----��
\
CS_10
?-'- .x83�.001--�
t
837
��
// / //
///
( IN FEET )
\
\
\
\ \
_
838
\ \
/�
-
/ �� =
HORIZONTAL 1 inch = 20 ft.
5 FT X 5 FT CONCRETE RI;
-839
839
- -
I \
- �
- - f842
/ /__-- j
�
f- /
___
TOP ELEV 84
\
\
+841
840
41
W/ TRASH R)
\
838
- --I- --
- -
-------
-
---- -
--_
-_842
_
\ \
- -
x 842.00
-
\
\
�
-837-
-
------
/
839
II
---
838
38
/
24 Wx6 H
837 836
/
839
--
--------------------------
- - _g
836
(1 WINDOS
-
- ----
\
o
%
5\
/
2.5" ORIFIC
-834-_
s
15" BARREL OUT
\
CS-9
/
/_---
834.25
//
-
--
i
I
830
7
RtP-RAPAPPRON
PROP. CHECK DAMS
STORM DESIG N
850 -
845 -
840 -
835 -
830 -
825 -
STORM WATER ELEV.
1-YR 839.40
2-YR 839.75
10-YR 840.55
25-YR 841.02
50-YR 841.20
100-YR 841.30
0
0
o
5q
4.
o M
o
�
24"x6"
ORIFICE
ELEV. 839.50
o
U
~�
c
E z
_
WIN
2.5" DI
DOW)
. ORIFICEELEV.
837.00
10'
_
--
0
q
6" CLEA
OUT
Co
CD L6 M
1.00'
DROP. GROUND
CL
0.5'
HIGH WITH
ROCK
V TOP
CHECK
WIDTH
DAMS
tea..
/
i
-
RIP RA
BERM
/
5" RCP @
0.50%
/
MIN. 1.5
FT CLEANED
WASHED
CONCRETE
/
-SAND WRAPP
12" #57
TONE WRAPPED
IN FILTER
FABRIC
RIP
RAP APRON
5'
5' X VAPITIFLOATION
BLO
K
6.0'
6.0' X 6'
APPR
DX. SHW
ELEV. 828.0
O
m
COCo
9 N
('7
CO
00
N M
u) ('7
Co
00
M
Co00 00
00
9
N
00 00
N
00
0+00
0+50
1+00
1+50
2+00
2+50
- 850
- 845
- 840
POST POST
PRE
15" RCP
TOTAL
STORM
CFS
CFS
CFS
10-YR
6.92
4.61
4.79
25-YR
9.34
5.87
6.07
50-YR
11.31
10.86
11.06
100-YR
13.39
14.99
15.19
835
RISER TRASH RACK
NTS
RISER DETAIL
NTS
"'TI-VORTEX PLATE
VIDE STEPS PER
)OT 840.66)
5'X5'X1'
CONCRETE ANCHOR
TECHNICAL SPECIFICATIONS:
1. SUBGRADE TO BE PROOF ROLLED PRIOR TO EARTH FILL PLACEMENT. ANY SOFT OR PUMPING
AREAS ARE TO BE UNDERCUT AND REPLACED WITH COMPACTED EARTH FILL.
2 COMPACTED EARTH FILL TO HAVE DRY UNIT WEIGHT OF AT LEAST 90 PCF. ALL EARTH FILL TO BE
COMPACTED TO MINIMUM OF 95 % OF STD. PROCTOR MAXIMUM DRY DENSITY.
3. EXCAVATED SIDE SLOPES TO BE STABILIZED WITH GRASS COVER IN ACCORDANCE WITH SEEDING
SPECIFICATIONS FROM EROSION & SEDIMENT CONTROL PLAN.
4. FINAL EMBANKMENT SLOPES TO BE TRACKED AND STABILIZED WITH GRASS COVER IN
ACCORDANCE WITH SEEDING SPECIFICATIONS FROM EROSION & SEDIMENT CONTROL PLAN.
5. REINFORCED CONCRETE RISER STRUCTURE TO BE PREFABRICATED 4 FT. x 4 FT. INTERIOR
DIMENSIONS.
JOINTS SHALL BE SEALE
WITH MASTIC CAULK. INSIE
JOINTS SHALL BE GROUTE
CONCRETE ANCHOR
co
W
U
X
=aWa
of z
�Lupa
�Www�
W M
Q z U
J J
U _ = w
C/)a
w
z U ^
O3:Rz
U)
r- d LL _
u')a-Of1
O w
z J_
cli
�I
I� g„
6,
D
E
4,
SECTION A -A
i t rB-ML OF-U i iUry
- PRECAST CONCRETE RISER
SECTIONS
PROVIDE 5 STEPS
(NCDOT 840.66)
;ONCRETE KEYWAY
FILTER
FABRIC
(MIRAFI 140 N)
(ALL SIDES
OF SAND)
rcr-,rummTED
PIPE/GRAVEL
UNDERDRAIN
SYSTEM
NOTES-
1. "CONCRETE" SAND REFERS TO SAND THAT IS
COMMONLY USED IN CONCRETE MIXES.
2. ALL DRAINAGE AREAS TO A SAND FILTER FACILITY
ARE TO BE STABILIZED PRIOR TO INSTALLATION
OF SAND.
3. UNDERDRAIN PIPES SHOULD BE MIN. 6"
PERFORATED SCHEDULE 40 PVC (PER AASHTO
M278) OR DOUBLE WALL HDPE (PER AASHTO M252).
PERFORATIONS SHOULD BE %" SPACED 3" ON
CENTER ALONG 4 LONGITUDINAL ROWS SPACED
90° APART.
SAND FILTER CROSS-SECTION
- 830 I NTS
- 825
Ilk
' 1 , c
GRAPHIC SCALE 1. CONTRACTOR IS FULLY RESPONSIBLE FOR CONTACTING
APPROPRIATE PARTIES AND ASSURING THAT EXISTING UTILITIES
0 1' 2' 4' ARE LOCATED PRIOR TO BEGINNING CONSTRUCTION.
0 10 20' 40'
2. CONTRACTOR IS RESPONSIBLE FOR PLACING BARRICADES USING
FLAG MEN, ETC., AS NECESSARY TO INSURE SAFETY.
3. ALL PAVEMENT CUTS, CONCRETE OR ASPHALT, ARE TO BE
( IN FEET) REPLACED ACCORDING TO STANDARDS OF THE NORTH CAROLINA
DEPARTMENT OF TRANSPORTATION AND LOCAL MUNICIPALITIES.
VERTICAL 1 inch = 4 ft.
HORIZONTAL 1 inch = 20 ft. 4. SHORING WILL BE ACCORDING TO OSHA TRENCHING STANDARDS
PART 1926 SUBPART P, OR AS AMENDED.
00
1.4 E.Cq N O
z 'o E
w W -,t 6
cn
C'sz
C+"
W 0
x
w W °z
O
1�
N CAR„
whqfit N on;
. z'21
Y
U
w
U
2
H
0
z
o
5
w
0
0
z
z
0
w
U
U
Z)
z
z
O
0
0
0
w
w
w
D-
o
w
N
N
N
Lo
N
A
C
N
11
Z
N
M
IPROJECT #: 2020-0001 DATE: 12/1/2020 I
DRAWN BY: JAC CHECKED BY: JAC
TITLE
SWCM 5 PLAN AND
PROFILE
SHEET
C-8.6
ME 1

N O
00
1-4
ww ��
P4E, L
�P4 V
e
W °
x �
\ .,3 0 T\
I
I SHEET FLOW = 150 FT
SLOPE = 7.0% / - \ `�`�VN CA e?
I Tc = 11.6 MIN. \ ���` Q. �«c..p.;' •
SHEET FLOW = 160 FT I
SLOPE = 4.0% SWCM #4 \ z
Tc = 15.2 MIN. ®� PRE DA: 3.5 AC. a° = �► 30916 }
POST DA: 3.5 AC.�eg
'0 9 IN .
U
SWCM #3 �� \
/ PRE DA: 6.5 AC. �/SWCM #5
�I POST DA: 7.3 AC. PRE DA: 1.8 AC.
� I J SWCM #2 \
/ POST DA: 1.8 C.
I�w PRE DA- 11.8 AC. \ /
POST DA: 12.5 AC.
r
N \ \
-- —
I /
I /
I \
I \ PRE DA: 16.5 AC.
/ / \ SWCM #1 �
I / POST DA: 20.5
W
TFFEI
I / o
a
W
U
w I I \\ \\ \\ GRAPHIC SCALE W
m, �� I I A \ \ �\ 0 100, 200' 400' A
N I SHEET FLOW = 225 FT
/ I I SLOPE = 3.6% \ \ ( IN FEET) o Tc = 20.9 MIN.CA
\ \ a W O
HORIZONTAL I inch = 200 ft. Q z z
.PE sg OHE �I I I \ \ a u o a
g — I I I \ \ > Z v o
m I z a F
APE O o W 3
p� o 1 1
o U
r1/ o
U Y+I N Q
N W
L O
71 W
O
/ � F
Q � O
O
N � F
++ Ca
N
O
L
a W
^ cG
I F+i z
0
a�
rn w
o ,
°a
L
++ dd
E
I
0
PROJECT #: 2020-0001 DATE: 12/1/2020
0
0
DRAWN BY: JAC CHECKED BY: JAC
O
N
O TITLE
N
BMP DRAINAGE AREAS
N
y
U
N
o SHEET
L
C-^ •7
c/ `VT/
G
J
m
/
O
0
z
w
0
U
Z
O
H
w
o_
y,
U
oa
�
N
�
Q
N
V
o
z