20211237 Ver 1_Modified Outfalls_20210916

Strickland, Bev
From: Rusty O'Neill <[e-mail]>
Sent: Thursday, September 16, 2021 4:13 PM
To: Johnson, Alan
Cc: Perez, Douglas J; Michael Foess; Tim Foley
Subject: RE: [External] RE: Windsong S/D #21-1237
Attachments: C26 - C28 - BMP - 2021-09-16.pdf
CAUTION: External email. Do not click links or open attachments unless you verify. Send all suspicious email as an attachment to
Report Spam.
Agreed & I have them added in the attached revised plan sheets. Per the original encroachment request I had left some
wiggle room on the downstream side of the rip -rap so there is plenty of room for them.
After looking at impact 3 and the interaction of the rip -rap / spreader and the creek line, there really wasn't enough
room to get them both in. I have relocated that outfall to the least impactful alternate location. If you need a revised
application with the changed impact 3 quantities plz let me know.
On the profiles for each pipe I have added the rip -rap apron & level spreader. The original apron calcs called for a 12'
length but with the pipe pulled back some and the apron extended to the level spreader approx. 18-20' is now provided
to function as the swale.
An additional sheet has been provided (28A) with the cross section detail from the DEQ Stormwater design manual C-9
and additional notes for this project specific info. A major part of the DEQ design criteria is the filter strip to act as a
water quality element but it's important to note that this is post sand filter / water quality so the filter strip is not that
important. The main intent for the LS add is velocity dissipation.
Please let me know your thoughts or if any other revisions are needed.
Thanks,
Rusty O'Neill
o: 704.875.1615 ext 308
HensonFoley
From: Johnson, Alan <[e-mail]>
Sent: Thursday, September 16, 2021 10:31 AM
To: Rusty O'Neill <[e-mail]>
Cc: Perez, Douglas J <[e-mail]>
Subject: RE: [External] RE: Windsong S/D #21-1237
In addition to the riprap, over time water has a way of concentrating flow, plus this is the
goose creek. And of course over time, burps aren't the most maintained and managed facility
1

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: Rusty O'Neill [mailto:[e-mail]]
Sent: Thursday, September 16, 2021 10:26 AM
To: Johnson, Alan <[e-mail]>
Cc: Michael Foess <[e-mail]>; Tim Foley <[e-mail]>
Subject: RE: [External] RE: Windsong S/D #21-1237
CAUTION: External email. Do not click links or open attachments unless you verify. Send all suspicious email as an attachment to
Report Spam.
Alan,
Are you requesting a level spreader in addition to the rip -rap or in lieu of? I don't have a problem adding this
requirement but please be aware that these are control structure discharges and the flows will be controlled not open
discharge from a collection network. For pond 1 at the 25 year event all flows pass through the discharge per the
calculation below with a max of 31.8 CFS but a calculated velocity of 10.14 FPS, then after the rip -rap which typically
removes about 2/3 of velocity results in a 3-4 FPS. Level spreader would further reduce that and is an easy addition.
Even at the 50 year event only a very small mount (0.06') will use the emergency overflow and not be controlled by the
orifice & weirs (below #5 weir passes 0 CFS @ 25 year).
Primary 4ulFIow Max=39-86 ds Ca: 12-28 hrs HW=557-2D' (Free Discharge}
u v rf ilnlet Contras
'-2�Sand Fl!ter Stage Storage Discharge (Passes < 0.07 cts potential flow)
— 3■OriticeiGrate (Passes < 0.50 efs potential pow}
— Broad-Crested Rectangular Weir (Passes r 39.96 cfs potential Row)
- Broad -Crested Rectangular Weir ( Controls 0.00 as)
For impact 1, the state required sand filter for water quality requires a depth of 550.50 or roughly 3.5' below the bottom
of the pond. Part of the revisions here was to raise the pond bottoms (1' on pond 1 that still gets positive flow from the
road to the pond) to minimize the needed buffer impact.
551-50
550.50
[2-GRAVEL SECPON CONSISTS OF --
7' OF 039 WASHED Ci-KKING STONE
2

The pipe preferable then has some slope to promote outfall. Most municipalities prefer 0.5%. 550.5 -> 550.0 over 92' =
0.54% slope.
EiCCE;111,1G GRADE
PROPDBED GARDE
550.0 contour is marked with teal arrows. I have positioned the outfall at the 550.0 elevation in the closest spot possible
to the buffers to minimize impacts. Based on the new topo that has been added to the EG surface, at no point does
550.0 fall outside the required buffer removing the need for the impact. So the issue is not being able to get the pipe to
daylight outside of the buffer based on the new topo.
For Impact 2, it's the same. Sand filter at 555.50, daylight at 555.0 over 104' = 0.48% slope
BUFFER IMPACT #2
_ 46_90 SF
4,
3

For impact 3, Sand filter at 551.50, daylight at 551.0 over 114' = 0.43%
Per your sketch, if I relocate the outfall to around the red contour labels area that will increase the buffer impact to
around 60'
If I move it to the intersection of the 100' / 200' (below the 200' buffer call out) then the impact is around 40'
While the current location does concentrate the flows into the creek line (an area that has historically seen concentrated
flows) , it also provides the least impact to the buffer.
1 N� •• 1,
}
,\ \ N. 1 2 1 1 \; _
\ �■ \1 \ x ' 51`,
I 1 1 l 1 I I
S s�,•
1 1 ` ' 1
ti CHAAroFJti g}y1 Tgt� \ I 1 \ I ; +1
1:),,..��F Zvi* `� ` 1,1 11 1 1 I 1 1I 1 1J' J.,
'N ` '1 •� 1i l 1 1 11 I I } / I /i�.
p `: k— t r l 1 1 I t I
1 • 1 I I ! / 1 :'1 1�
l 1 I 11' r
\ 1 (y,1'
I 61-HBERM•T MIT 1 V r 1 I)
I LEVEL sraEAnExv,� V I I ! \ ✓t�
240 SF SAND F VER 11 11 1 I I 1 � 7 I �
V 11 .' •, ,� I r
�10111 . I24' . 1 tI 1 1 \ 11 fl ' -�.l
.BMPPOND3l i 1�1�k I 1 ,It \.•`4
J17:'.....1.1SAND,IJ
k 1'1►1 1 1 I ` I1 1 ({• tr
1 1L1 eon°'"1 1 11i�LJr
1I II11
I hope this info helps and look forward to continuing this conversation. Please let me know if you'd like to have a call to
discuss further.
Thanks,
Rusty O'Neill
o: 704.875.1615 ext 308
HensonFoley
From: Johnson, Alan <[e-mail]>
Sent: Wednesday, September 15, 2021 4:59 PM
4

To: Rusty O'Neill <[e-mail]>
Subject: RE: [External] RE: Windsong S/D #21-1237
Use of a "level spreader" to help with overland flow for all outfalls
It appears that impact 1 and 2 could be placed outside the buffer. If it is slope, would a
"elbow" help or discharge at a slope, but with a plunge pool? Impact 3, I appreciate
discharginge to a drainage feature (I assume), but that maintains concentrated flow, is the
slope to great to discharge more through the buffer?
rigid level spreader
•
..,„„„,:‘,1401110111
IMP lir
%Nom/
high enough to "bust
up" high energy
discharge
5

I 1
r ,
nd Si
N • '1.•
a•
.E
� r
DWR
Division of Water Resources
k
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: Rusty O'Neill [mailto:[e-mail]]
Sent: Wednesday, September 15, 2021 4:38 PM
To: Johnson, Alan <[e-mail]>; Michael Foess <[e-mail]>
Cc: [e-mail]; Tim Foley <[e-mail]>
Subject: RE: [External] RE: Windsong S/D #21-1237
CAUTION: External email. Do not click links or open attachments unless you verify. Send all suspicious email as an attachment to
Report Spam.
Alan,
Attached, please find the 3 BMP sheets C26, 27 & 28. These have a 30 scale inset of the BMP pond, pipe outfall, buffer
limits and buffer impacts / pond revisions which have been clouded.
If you need to see these in more relation to the C/L of the stream I can easily change the view to center on the pipe /
stream for another exhibit.
6

Thanks,
Rusty O'Neill
o: 704.875.1615 ext 308
HensonFoley
From: Johnson, Alan <[e-mail]>
Sent: Wednesday, September 15, 2021 3:48 PM
To: Michael Foess <[e-mail]>; Rusty O'Neill <[e-mail]>
Cc: [e-mail]; Tim Foley <[e-mail]>
Subject: RE: [External] RE: Windsong S/D #21-1237
Can I get a blow up of the pipe(s) in question. NC Wildlife has concerns.
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: Michael Foess [mailto:[e-mail]]
Sent: Monday, September 13, 2021 4:03 PM
To: Rusty O'Neill <[e-mail]>; Johnson, Alan <[e-mail]>
Cc: [e-mail]; Tim Foley <[e-mail]>
Subject: [External] RE: Windsong S/D #21-1237
CAUTION: External email. Do not click links or open attachments unless you verify. Send all suspicious email as an attachment to
Report Spam.
Rusty and Alan,
That pipe has already been installed.
Michael Foess, PE, PMP
Montrose LLC
7

From: Rusty O'Neill <[e-mail]>
Sent: Monday, September 13, 2021 3:39 PM
To: Michael Foess <[e-mail]>; Johnson, Alan <[e-mail]>
Cc: [e-mail]; Tim Foley <[e-mail]>
Subject: RE: Windsong S/D #21-1237
Alan,
Per the screen clip below, that structure was part of the offsite bypass system and discharges ROW flows upstream of
the perennial stream 1 bypass headwall and does not flow to pond 1. The intent was to keep the original drainage
pattern intact. In the original conditions the ROW water flowed into the creek above the roadway and provided flow to
the perennial stream #1. Per conversations with the wetlands consultant we didn't want to remove those flow and
potentially damage the lower section of the stream. That's how this was originally permitted and was not intended to be
part of the buffer encroachment submittal.
The only request for this submittal was for the 3 pond control structure outfalls to extend into the buffer to allow them
to daylight for discharge. The need for the change was the incorrect existing grades provided by the original surveyor
who is no longer part of the project.
That said, I don't have a problem with the proposed revision but I would have to check to see if this pipe has been
installed or not.
Thanks,
Rusty O'Neill
o: 704.875.1615 ext 308
HensonFoley
From: Michael Foess <[e-mail]>
Sent: Monday, September 13, 2021 3:05 PM
To: Johnson, Alan <[e-mail]>
Cc: Rusty O'Neill <[e-mail]>; [e-mail]
Subject: RE: Windsong S/D #21-1237
Alan,
The screenshot you included below is the storm water going to pond #1, it needs to be treated before being discharged.
We are requesting approval to extend the outlet pipe into the buffer as the topo in the buffer did not allow the outlet
pipe to daylight at the designed location outside of the buffer. We already raised the ponds as much as possible. I have
attached sheet C09 from the approved plans and clouded the outlet pipes/FES we are requesting to be extended into
the buffer.
I have copied the engineer, Rusty, and surveyor, Jay, who will have more detailed information. I am the development
consultant for the owner.
Thanks,
Michael Foess, PE, PMP
Montrose LLC
8

From: Johnson, Alan <[e-mail]>
Sent: Monday, September 13, 2021 2:13 PM
To: Michael Foess <[e-mail]>
Subject: Windsong S/D #21-1237
1) It looks like all other outfalls discharge outside the buffer. Why can't the outfall below,
be relocated as suggested. If not, please provide clarity (the condition/item) from the
Table of Uses that is being applied to this situation
2) Stream SB and SD, both have 100 ft buffers
3) Confused with the three impacts related to the same item at the same site
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]
9

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.
10

SAND FILTER NOTES
1. AVOID DISTURBING THE PROPOSED SAND FILTER AREA UNTIL AFTER THE INITIAL ROUGH GRADING AND TEMPORARY STABILIZATION HAS
BEEN PERFORMED.
2. EXCAVATE THE SAND FILTER TO THE DESIGN DIMENSIONS.
3. THE UNDERDRAIN SYSTEM SHALL BE EQUIPPED WITH 6-INCH MINIMUM PERFORATED SCHEDULE 40 OR STRONGER PVC PIPE, AASHTO M252
FOR DOUBLE WALL HDPE OR BE %" IN DIAMETER SPACED 3 INCHES ON CENTER ALONG 4 LONGITUDINAL ROWS THAT ARE SPACES 90"
APART. THE UNDERDRAIN PIPES SHALL BE INSTALLED AT 0% SLOPE.
4. SOIL AND GRAVEL COVER OVER THE UNDERDRAIN SHALL BE AT LEAST 3.0 FEET IN DEPTH.
5. GRAVEL BED MATERIALS (STONE) SIZE SHALL NOT BE GREATER THAN %2 TO 1%2 INCHES IN DIAMETER. (BLUE STONE, DOUBLE WASHED, #57)
6. FILTER FABRIC MUST MEET A MINIMUM PERMEABILITY RATE OF 75 GALLONS/MIN/SQUARE FOOT AND SHALL NOT IMPEDE THE INFILTRATION
RATE OF THE SOIL MEDIUM. NON -WOVEN FABRIC IS REQUIRED. INSTALLATION REQUIRES AT LEAST 1 FOOT OVERLAP AT THE ENDS AND
STRIKING IN PLACE DURING CONSTRUCTION AT THE TUNED SURFACES.
7. SOIL PREPARATION TO BE IN ACCORDANCE WITH CITY OF CHARLOTTE WATER QUALITY DESIGN MANUAL.
SAND FILTER MAINTENANCE
1. THE OWNER AND ALL SUBSEQUENT OWNERS OF THE PROPERTY SHALL ACCEPT RESPONSIBILITY AND MAINTENANCE OF ALL ON SITE SAND
FILTER AND BMP FACILITIES. THE OWNER WILL PROVIDE MAINTENANCE TO THE FACILITIES AS DESCRIBED IN THE PROJECT OPERATIONS AND
MAINTENANCE MANUAL AS WELL AS THE CITY OF CHARLOTTE STORMWATER ORDINANCE AND THE MECKLENBURG COUNTY BMP
MANUAL.
2. BMP SHALL BE PERIODICALLY INSPECTED BY THE OWNER OR OWNER'S REPRESENTATIVE AS DESCRIBED IN THE MAINTENANCE MANUAL
AND SCHEDULE TO IDENTIFY MAINTENANCE AND REPAIR NEEDS AND TO ENSURE COMPLIANCE WITH THE REQUIREMENTS OF THE
MAINTENANCE SCHEDULE. ANY IDENTIFIED MAINTENANCE AND/OR REPAIR NEEDS SHALL BE ADDRESSED IN A TIMELY MANNER. RECORDS
SHALL BE MAINTAINED BY THE OWNER AND REVIEWED BY COUNTY PERSONNEL WHEN REQUESTED.
REPAIR TO THE EXISTING SAND FILTERS
1. THE CONTRACTOR SHALL RE -CONSTRUCT THE EXISTING SAND FILTER PER THESE CONSTRUCTION PLANS AND PER THE CHARLOTTE AND
MECKLENBURG COUNTY BEST MANAGEMENT PRACTICES DESIGN MANUAL. FOR MORE SPECIFIC INFORMATION ON THE CONSTRUCTING
AND MATERIALS FOR THE SAND FILTER, REFER TO SAND FILTER SPECIFICATIONS FOR THIS PROJECT.
2. WHEN BACKFILLING THE FACILITY, SOIL SHOULD BE PLACED IN LIFTS 12 TO 18 INCHES DEEP. HEAVY EQUIPMENT SHOULD NOT BE PLACED
WITHIN THE SAND FILTER BASIN. HEAVY EQUIPMENT CAN BE USED AROUND THE PERIMETER OF THE BASIN TO SUPPLY SOILS AND SAND.
WITHOUT SOME COMPACTION, DIFFERENTIAL SETTLEMENT MAY OCCUR. SAND FILTER MATERIALS SHOULD BE GRADED WITH LIGHT
EQUIPMENT SUCH AS COMPACT LOADER OR DOZER / LOADER WITH MARSH TRACKS. IN ADDITIONS, PRESOAKING OF THE FACILITY
SHOULD BE USED TO HELP SETTLE THE MATERIAL.
INSPECTION NOTES
1. INSPECTIONS SHALL BE CONDUCTED AS PRESCRIBED BY THE MAINTENANCE COVENANT. ADDITIONAL INSPECTIONS MAY BE CONDUCTED
BY MECKLENBURG COUNTY ON ANY REASONABLE BASIS, INCLUDING BUT NOT LIMITED TO: ROUTINE INSPECTIONS; RANDOM
INSPECTIONS; INSPECTIONS BASED UPON COMPLAINTS OR OTHER NOTICE OF POSSIBLE VIOLATIONS; INSPECTIONS OF DRAINAGE BASINS
OR AREAS IDENTIFIED AS HIGHER THAN TYPICAL SOURCES OF SEDIMENT OR OTHER CONTAMINANTS OR POLLUTANTS; INSPECTIONS OF
BUSINESSES OR INDUSTRIES OF A TYPE ASSOCIATED WITH HIGHER THAN USUAL DISCHARGES OR POLLUTANTS OR WITH DISCHARGES OF A
TYPE WHICH ARE MORE LIKELY THAN THE TYPICAL DISCHARGE TO CAUSE VIOLATIONS OF STATE AND FEDERAL WATER QUALITY
STANDARDS OR THE NPDES STORM WATER PERMIT; AND JOINT INSPECTIONS WITH OTHER AGENCIES UNDER ENVIRONMENTAL AND SAFETY
LAWS. INSPECTIONS MAY INCLUDE BUT ARE NOT LIMITED TO: REVIEWING MAINTENANCE AND REPAIR RECORDS; SAMPLING DISCHARGES,
SURFACE WATER, GROUNDWATER, AND MATERIAL OR WATER IN BMPS; EVALUATING THE CONDITION OF THE BMPS AND STORMWATER
MANAGEMENT PRACTICES.
2. RIGHT-OF-WAY ENTRY FOR INSPECTION, WHEN ANY NEW BMP IS INSTALLED, THE PROPERTY OWNER SHALL GRANT TO MECKLENBURG
COUNTY THE RIGHT TO ENTER THE PROPERTY AT REASONABLE TIMES AND IN A REASONABLE MANNER FOR THE PURPOSES OF INSPECTION.
THIS INCLUDES THE RIGHT TO ENTER A PROPERTY WHEN THE MECKLENBURG COUNTY HAS A REASONABLE BASIS TO BELIEVE THAT A
VIOLATION OF THIS REGULATION IS OCCURRING OR HAS OCCURRED, AND TO ENTER WHEN NECESSARY FOR ABATEMENT OF A PUBLIC
NUISANCE OR CORRECTION OF A VIOLATION OF THIS REGULATION.
STORM DRAINAGE AS -BUILT REQUIREMENTS
1. THE CONTRACTOR SHALL FURNISH AN AS -BUILT SURVEY OF THE STORM DRAINAGE AND BIORETENTION BASIN IN PRINTED HARD COPY
AND CAD FILE FORMAT, SIGNED AND SEALED BY A LAND SURVEYOR LICENSED IN NORTH CAROLINA. THE CAD FILE SHALL BE BASED ON
NC GRID, NAVD 1983 (TIED TO STATE PLANE COORDINATE SYSTEM). ELEVATIONS SHALL BE TIED TO NAVD88.
2. THE AS -BUILT SURVEY SHALL PROVIDE THE FOLLOWING INFORMATION: STORM DRAINAGE PIPE LOCATIONS WITH SIZE, LENGTH, AND
MATERIAL; STORM DRAINAGE INLET, OUTLET, AND CLEAN OUT STRUCTURE LOCATIONS WITH RIM AND INVERT ELEVATIONS AT EACH PIPE,
WITH INVERT AND TOP OF WEIR ELEVATION FOR ANY INTERNAL BAFFLE WALLS INSIDE OF STRUCTURE; FINISHED GRADE CONTOURS OF
BIORETENTION BASIN AT 1 FOOT INTERVALS, WITH SQUARE FOOTAGE OF THE BASIN; INSIDE DIMENSIONS OF INLET AND OUTLET STRUCTURES
WITHIN THE BASIN AT 25 FOOT INTERVALS MAXIMUM.
3. THE AS -BUILT SURVEY SHALL BE SUBMITTED TO THE DESIGN ENGINEER AT LEAST 45 DAYS PRIOR TO THE ANTICIPATED DATE OF COMPLETION
OF OCCUPANCY.
BMP CONSTRUCTION SEQUENCE NOTES
1. CALL THE WATER QUALITY INSPECTOR TO SET UP A BMP PRE -CONSTRUCTION MEETING PRIOR TO STARTING ANY
WORK ON BMPS. THIS MEETING SHOULD TAKE PLACE AT LEAST 48 HOURS PRIOR TO STARTING CONSTRUCTION
ON ANY BMP AND SHALL INCLUDE THE DESIGN ENGINEER TO ENSURE ENGINEER INSPECTIONS ARE PERFORMED
AT KEY BMP INSTALLATION PHASES.
2. THE DESIGN ENGINEER MUST VERIFY AND CERTIFY THE DRAINAGE AREA IS PROPERLY STABILIZED; MEASURES
ARE IN PLACE TO PREVENT SEDIMENTATION INTO THE BMP, THE STORM DRAINS, INLETS AND PAVEMENT HAVE
BEEN PROPERLY CLEANED PRIOR TO COMMENCEMENT OF BMP CONSTRUCTION.
3. ADDITIONAL MEASURES, TO ENSURE PROPER CONSTRUCTION AND OPERATION OF THE BMP, MAY BE REQUIRED
BY THE WATER QUALITY INSPECTOR.
4. A DOUBLE -RINGED INFILTROMETER TEST (ASTM D 3385), OF THE BOTTOM OF THE SAND FILTER, MUST BE
SUBMITTED TO THE WATER QUALITY INSPECTOR PRIOR TO THE INSTALLATION OF THE UNDERDRAIN SYSTEM.
5. THE RESULTS OF THE DOUBLE -RINGED INFILTROMETER TEST MUST SHOW INFILTRATION CAPABILITIES, CONFIRMED
BY THE DESIGN ENGINEER, AND SUBMITTED FOR BMP AS -BUILT APPROVAL.
I INVERT AT CREEK
550.00
CONCRETE ANTI SEEP
SECTION A -A
24" RCP
CONCRETE ANCHOR
ANTI -FLOTATION BLOCK
5.0'X 5.0'X 2.3'
POND 1 - STORMWATER BMP - SECTION
-WEIR OPEN ON ALL 4 SIDES.
AND FILTER BMP SUMMARY CHART - POND 1
PEAK CONTROL
STORM EVENT
TOTAL PRE DEVELOPMENT
RUNOFF
POST DEVELOPMENT
RUNOFF
POST -ROUTING RUNOFF
ELEVATION
TOP OF DAM
559.00
50YR-24 H R
43.44
109.04
33.30
557.72
25YR-24 H R
35.89
92.52
31.86
557.20
1 OYR-24 H R
26.68
71.94
23.20
556.63
1 YR-24H R
8.37
28.12
1.46
555.59
BMP
REQUIRED
PROVIDED
ELEVATION
W Q V
12,945
13, 070
554.53
SAND FILTER
685
685
TOP 554.00
SAND FILTER MAX ALLOWABLE BUA
155,358 SF
TOTAL IMPERVIOUS TO SAND FILTER
135,617 SF
3.5'' ORIFICE @ IN'
TOP OF SAND ELEV
OUTLET STRUCTURE
EMERGENCY SPILLWAY)
ELEV. 558.0 6" DIAMETER
CLEANOUT (TYP.)
50YR=557.72 -
WQv ELEV. 554.53
TOP 554.0
ASTM C33 OR EQUIVALENT SAND
12" GRAVEL SECTION CONSISTS OF -
2" OF #89 WASHED CHOKING STONE -
10" OF #57 WASHED STONE
6" DIA. PERFORATED UNDERDRAIN - PVC
AASHTO M252 OR HDPE WITH SMOOTH INNER
WALL, WRAPPED WITH FILTER FABRIC.
PROVIDE 4" MIN. COVER OVER PVC
MANHOLE FOR ACCESS
PER NCDOT STANDARD
WEIR TO BE BLOCKED OFF WITH
STEEL PLATE DURING EROSION
CONTROL PHASES
RECTANGULAR WEIR. 555.4
(2.5ON 2 SIDES)
LADDER RUNGS FOR ACCESS
PER NCDOT STANDARD
24" DIA RCP OUT
6" DIA ORIFICE
FROM SAND FILTER UNDERDRAIN
NORTHWEST FACE
NOTICE TO CONTRACTOR
PROVIDE AN UPDATED OUTLET STRUCTURE DETAIL CUT SHEET
FROM THE ENGINEER TO THE WATER QUALITY INSPECTOR
PRIOR TO CONSTRUCTION. THE UPDATED CUT SHEET SHALL
BE PROVIDED ON THE BMP AS -BUILT SUBMITTAL.
2:1 SIDE SLOPES BETWEEN FOREBAY & MAIN POND.
USE CLASS 1 RIP RAP OVER FILTER FABRIC.
LINE FOREBAY WITH 6" OF #57 STONE (WASHED)
6" HIGH BERM - TYPE B EC STONE ROCK SEDIMENT DIKE
LEVEL SPREADER ELEV. 553.50 ELEV 556.0
�I JIII�-
ROCK COFFER FOREBAY
�II ISsB ` 100'
UNDISTURBED
BUFFER
1 \ ,
SS6 \ E� SF/l4 NQ
SSA
SEDIMENT
CHAMBER-1
\ S S
��lsY9 s18 \ \\ \\ \\ BUFFER IMPACT#1 I I \\
\\\ STONE SEDIMENT DIKE \ s ` \ \ 640 SF�� V I
/ 1
%
\ \ 21.6' \ \
I \ \
I \
I I \
I \
I N
/
I
II
III
os F14-
IOkp 25.0'
4'
00
\\ 27.4'/ \ \ I \ I I 0 v
I
685 SF SAND FILTER \ II \ \ i
BMP POND 1
y �tlL
SAND
I I CS
I CHAMBER 1 I I I II 1 1 \ \\ \ OF FES 1
6" HIGH BERM - TYPE B EC STONE I I
I
LEVEL SPREADER ELEV 554.50
I Qo`'
STONE SEDIMENT DIKE ` ���^� q
°° QD
V) h , 55� h �h / sss
POND BOTTOM h h h
554.0'
SEDIMENT / // / / K/
CHAMBER 2
�5�
L I
STORMWATER BMP - ENLARGEMENT
TOP 559.0
NOTES:
OPEN WEB MAT AROUND UNDER 1. THE UNDERDRAIN COLLECTION SYSTEM SHOULD BE EQUIPPED WITH A 6-INCH MIN PERFORATED SCHEDULE 40 OR STRONGER PVC PIPE
DRAIN &GRAVEL BED (ALL SIDES) OR DOUBLE WALL HDPE PIPE. PERFORATIONS SHALL BE PER AASHTO M278 FOR PVC PIPE, AASHTO M252 FOR DOUBLE WALL HDPE PIPE
OR BE 3/8-INCH IN DIAMETER SPACED 3-INCHES ON CENTER ALONG 4 LONGITUDINAL ROWS THAT ARE SPACED 900 APART. THE PIPES
SHALL HAVE A MIN SLOPE ON 0.0% AND A MAXIMUM SPACING OF 10' ON CENTER.
SCARIFY SUBGRADE TO 6-9" MIN. & LEAVE
UNCOMPACTED IN ACCORDANCE WITH 2. PLACE THE SAND -BASED, WASHED BERMUDA SOD DIRECTLY ON THE SAND MIXTURE.
CHARLOTTE/MECKLENBURG BMP MANUAL
3. DO NOT USE TOPSOIL ON TOP OF THE SAND MEDIA.
4. CLEANOUTS OF 6-INCH SOLID PVC MUST BE PROVIDED FOR EVERY 50 LINEAR FEET OF UNDERDRAIN, AT ALL BENDS, AND ENDS OF THE
SYSTEM FOR MAINTENANCE PURPOSES. THE TOP OF THE CLEANOUTS SHOULD EXTEND 6 INCHES ABOVE THE TOP OF FILTER AND HAVE
WATERTIGHT, VANDAL -PROOF CAP. AT LEAST ONE CLEANOUT SHALL BE INSTALLED AS AN EMERGENCY DRAIN THAT IS FLUSH WITH THE
TOP OF THE FILTER AND HAVE A 6-INCH THREADED EXTENSION PIPE. THE FURTHEST CLEANOUT FROM THE OUTLET MUST HAVE THE
MINIMUM REQUIRED FILTER MEDIUM DEPTH.
560
560
EXISTING GRADE
PROPOSED GRADE
55
555
INV
55
OUT:550.50
CS 1
1
OF FES
IN:550.00
78
IN
INV
55C
LF OF 24" RCP
#57 STONE ON
FILTER FABRIC
RIP -RAP APRON
LEVEL SPREADER
545
54
am
c')
O
^
�
O.
N
ao
w
It
U_
c-i
w
m
U_
o:
iD
w
r�
iD
w
0+00 0+50 1+00 1+50
POND 1 OUTFACE PROFILE
1"=40'
o
5,
0 U
>
o a)
N
co O
CV
co
U10
WykM
W
N
-
N
C? w c�
C) Z
w
W
zvg J N
LLU
LJ
= -
Now
w<U
U 0 0
J m
1
T
Q CLo
0 ll.l
Q
U
o
O
0
N �
0�°
mwC�
v I
00
U
> �
U
cn O
L I�
0
w
ZaN
O
0
Z
-
w U
�Q
W�E
L
O -�/�
zzzU
Q
r'
J Z
`0
N
Q
J V
U
Z
CV �
70
00 ^v
O
C
O
�
J
Q
N
W E
S
NORTH ARROW
0 15 30 60
GRAPHIC SCALE 1 "=30 FT.
AL
23557 =
-A °° 7/2/ZOZ/ °
° !VG I NEB
Z
O U V)
(� Z J
z
Q Nt :D w
O
� Z
co O
C� o z Q
0 :D
C� LU z
Z
O
_ 5
Z m
REVISIONS:
3-21-19 - NCDOT COMMENTS
6-1-19 - ACOE COMMENTS
9-12-19 - COUNTY UTILITY COMMENTS
10-24-19 - NCDOT COMMENTS
01-07-20 - NCDOT COMMENTS
0 1 -20-20 - STATE WQ COMMENTS
02-17-20 - COUNTY COMMENTS
03-20-20 - NCDOT COMMENTS
03-27-20 - UCPW & CNTY COMMENTS
06-30-20 - UCPW & CNTY COMMENTS
08-28-20 - UCPW & CNTY COMMENTS
09-17-20 - UCPW COMMENTS
1 1-16-20 - DOT 3PARTY COMMENTS
1 1-23-20 - FOR CONSTRUCTION REV 1
06-21-21 - DEQ MINOR MOD
C26 - BMP.DWG
PROJECT NUMBER:
217053
DATE: 08/9/2017
DRAWN BY: FIR
SHEET C 2 6
OF 35
C26 - BMP.DWG -PLOT: rusty - THU. 9-16-2021 3:53 PM

SAND FILTER NOTES
1. AVOID DISTURBING THE PROPOSED SAND FILTER AREA UNTIL AFTER THE INITIAL ROUGH GRADING AND TEMPORARY STABILIZATION HAS
BEEN PERFORMED.
2. EXCAVATE THE SAND FILTER TO THE DESIGN DIMENSIONS.
3. THE UNDERDRAIN SYSTEM SHALL BE EQUIPPED WITH 6-INCH MINIMUM PERFORATED SCHEDULE 40 OR STRONGER PVC PIPE, AASHTO M252
FOR DOUBLE WALL HDPE OR BE %" IN DIAMETER SPACED 3 INCHES ON CENTER ALONG 4 LONGITUDINAL ROWS THAT ARE SPACES 90"
APART. THE UNDERDRAIN PIPES SHALL BE INSTALLED AT 0% SLOPE.
4. SOIL AND GRAVEL COVER OVER THE UNDERDRAIN SHALL BE AT LEAST 3.0 FEET IN DEPTH.
5. GRAVEL BED MATERIALS (STONE) SIZE SHALL NOT BE GREATER THAN %2 TO 1%2 INCHES IN DIAMETER. (BLUE STONE, DOUBLE WASHED, #57)
6. FILTER FABRIC MUST MEET A MINIMUM PERMEABILITY RATE OF 75 GALLONS/MIN/SQUARE FOOT AND SHALL NOT IMPEDE THE INFILTRATION
RATE OF THE SOIL MEDIUM. NON -WOVEN FABRIC IS REQUIRED. INSTALLATION REQUIRES AT LEAST 1 FOOT OVERLAP AT THE ENDS AND
STRIKING IN PLACE DURING CONSTRUCTION AT THE TUNED SURFACES.
7. SOIL PREPARATION TO BE IN ACCORDANCE WITH CITY OF CHARLOTTE WATER QUALITY DESIGN MANUAL.
SAND FILTER MAINTENANCE
1. THE OWNER AND ALL SUBSEQUENT OWNERS OF THE PROPERTY SHALL ACCEPT RESPONSIBILITY AND MAINTENANCE OF ALL ON SITE SAND
FILTER AND BMP FACILITIES. THE OWNER WILL PROVIDE MAINTENANCE TO THE FACILITIES AS DESCRIBED IN THE PROJECT OPERATIONS AND
MAINTENANCE MANUAL AS WELL AS THE CITY OF CHARLOTTE STORMWATER ORDINANCE AND THE MECKLENBURG COUNTY BMP
MANUAL.
2. BMP SHALL BE PERIODICALLY INSPECTED BY THE OWNER OR OWNER'S REPRESENTATIVE AS DESCRIBED IN THE MAINTENANCE MANUAL
AND SCHEDULE TO IDENTIFY MAINTENANCE AND REPAIR NEEDS AND TO ENSURE COMPLIANCE WITH THE REQUIREMENTS OF THE
MAINTENANCE SCHEDULE. ANY IDENTIFIED MAINTENANCE AND/OR REPAIR NEEDS SHALL BE ADDRESSED IN A TIMELY MANNER. RECORDS
SHALL BE MAINTAINED BY THE OWNER AND REVIEWED BY COUNTY PERSONNEL WHEN REQUESTED.
REPAIR TO THE EXISTING SAND FILTERS
1. THE CONTRACTOR SHALL RE -CONSTRUCT THE EXISTING SAND FILTER PER THESE CONSTRUCTION PLANS AND PER THE CHARLOTTE AND
MECKLENBURG COUNTY BEST MANAGEMENT PRACTICES DESIGN MANUAL. FOR MORE SPECIFIC INFORMATION ON THE CONSTRUCTING
AND MATERIALS FOR THE SAND FILTER, REFER TO SAND FILTER SPECIFICATIONS FOR THIS PROJECT.
2. WHEN BACKFILLING THE FACILITY, SOIL SHOULD BE PLACED IN LIFTS 12 TO 18 INCHES DEEP. HEAVY EQUIPMENT SHOULD NOT BE PLACED
WITHIN THE SAND FILTER BASIN. HEAVY EQUIPMENT CAN BE USED AROUND THE PERIMETER OF THE BASIN TO SUPPLY SOILS AND SAND.
WITHOUT SOME COMPACTION, DIFFERENTIAL SETTLEMENT MAY OCCUR. SAND FILTER MATERIALS SHOULD BE GRADED WITH LIGHT
EQUIPMENT SUCH AS COMPACT LOADER OR DOZER / LOADER WITH MARSH TRACKS. IN ADDITIONS, PRESOAKING OF THE FACILITY
SHOULD BE USED TO HELP SETTLE THE MATERIAL.
INSPECTION NOTES
1. INSPECTIONS SHALL BE CONDUCTED AS PRESCRIBED BY THE MAINTENANCE COVENANT. ADDITIONAL INSPECTIONS MAY BE CONDUCTED
BY MECKLENBURG COUNTY ON ANY REASONABLE BASIS, INCLUDING BUT NOT LIMITED TO: ROUTINE INSPECTIONS; RANDOM
INSPECTIONS; INSPECTIONS BASED UPON COMPLAINTS OR OTHER NOTICE OF POSSIBLE VIOLATIONS; INSPECTIONS OF DRAINAGE BASINS
OR AREAS IDENTIFIED AS HIGHER THAN TYPICAL SOURCES OF SEDIMENT OR OTHER CONTAMINANTS OR POLLUTANTS; INSPECTIONS OF
BUSINESSES OR INDUSTRIES OF A TYPE ASSOCIATED WITH HIGHER THAN USUAL DISCHARGES OR POLLUTANTS OR WITH DISCHARGES OF A
TYPE WHICH ARE MORE LIKELY THAN THE TYPICAL DISCHARGE TO CAUSE VIOLATIONS OF STATE AND FEDERAL WATER QUALITY
STANDARDS OR THE NPDES STORM WATER PERMIT; AND JOINT INSPECTIONS WITH OTHER AGENCIES UNDER ENVIRONMENTAL AND SAFETY
LAWS. INSPECTIONS MAY INCLUDE BUT ARE NOT LIMITED TO: REVIEWING MAINTENANCE AND REPAIR RECORDS; SAMPLING DISCHARGES,
SURFACE WATER, GROUNDWATER, AND MATERIAL OR WATER IN BMPS; EVALUATING THE CONDITION OF THE BMPS AND STORMWATER
MANAGEMENT PRACTICES.
2. RIGHT-OF-WAY ENTRY FOR INSPECTION, WHEN ANY NEW BMP IS INSTALLED, THE PROPERTY OWNER SHALL GRANT TO MECKLENBURG
COUNTY THE RIGHT TO ENTER THE PROPERTY AT REASONABLE TIMES AND IN A REASONABLE MANNER FOR THE PURPOSES OF INSPECTION.
THIS INCLUDES THE RIGHT TO ENTER A PROPERTY WHEN THE MECKLENBURG COUNTY HAS A REASONABLE BASIS TO BELIEVE THAT A
VIOLATION OF THIS REGULATION IS OCCURRING OR HAS OCCURRED, AND TO ENTER WHEN NECESSARY FOR ABATEMENT OF A PUBLIC
NUISANCE OR CORRECTION OF A VIOLATION OF THIS REGULATION.
STORM DRAINAGE AS -BUILT REQUIREMENTS
1. THE CONTRACTOR SHALL FURNISH AN AS -BUILT SURVEY OF THE STORM DRAINAGE AND BIORETENTION BASIN IN PRINTED HARD COPY
AND CAD FILE FORMAT, SIGNED AND SEALED BY A LAND SURVEYOR LICENSED IN NORTH CAROLINA. THE CAD FILE SHALL BE BASED ON
NC GRID, NAVD 1983 (TIED TO STATE PLANE COORDINATE SYSTEM). ELEVATIONS SHALL BE TIED TO NAVD88.
2. THE AS -BUILT SURVEY SHALL PROVIDE THE FOLLOWING INFORMATION: STORM DRAINAGE PIPE LOCATIONS WITH SIZE, LENGTH, AND
MATERIAL; STORM DRAINAGE INLET, OUTLET, AND CLEAN OUT STRUCTURE LOCATIONS WITH RIM AND INVERT ELEVATIONS AT EACH PIPE,
WITH INVERT AND TOP OF WEIR ELEVATION FOR ANY INTERNAL BAFFLE WALLS INSIDE OF STRUCTURE; FINISHED GRADE CONTOURS OF
BIORETENTION BASIN AT 1 FOOT INTERVALS, WITH SQUARE FOOTAGE OF THE BASIN; INSIDE DIMENSIONS OF INLET AND OUTLET STRUCTURES
WITHIN THE BASIN AT 25 FOOT INTERVALS MAXIMUM.
3. THE AS -BUILT SURVEY SHALL BE SUBMITTED TO THE DESIGN ENGINEER AT LEAST 45 DAYS PRIOR TO THE ANTICIPATED DATE OF COMPLETION
OF OCCUPANCY.
BMP CONSTRUCTION SEQUENCE NOTES
1. CALL THE WATER QUALITY INSPECTOR TO SET UP A BMP PRE -CONSTRUCTION MEETING PRIOR TO STARTING ANY
WORK ON BMPS. THIS MEETING SHOULD TAKE PLACE AT LEAST 48 HOURS PRIOR TO STARTING CONSTRUCTION
ON ANY BMP AND SHALL INCLUDE THE DESIGN ENGINEER TO ENSURE ENGINEER INSPECTIONS ARE PERFORMED
AT KEY BMP INSTALLATION PHASES.
2. THE DESIGN ENGINEER MUST VERIFY AND CERTIFY THE DRAINAGE AREA IS PROPERLY STABILIZED; MEASURES
ARE IN PLACE TO PREVENT SEDIMENTATION INTO THE BMP, THE STORM DRAINS, INLETS AND PAVEMENT HAVE
BEEN PROPERLY CLEANED PRIOR TO COMMENCEMENT OF BMP CONSTRUCTION.
3. ADDITIONAL MEASURES, TO ENSURE PROPER CONSTRUCTION AND OPERATION OF THE BMP, MAY BE REQUIRED
BY THE WATER QUALITY INSPECTOR.
4. A DOUBLE -RINGED INFILTROMETER TEST (ASTM D 3385), OF THE BOTTOM OF THE SAND FILTER, MUST BE
SUBMITTED TO THE WATER QUALITY INSPECTOR PRIOR TO THE INSTALLATION OF THE UNDERDRAIN SYSTEM.
5. THE RESULTS OF THE DOUBLE -RINGED INFILTROMETER TEST MUST SHOW INFILTRATION CAPABILITIES, CONFIRMED
BY THE DESIGN ENGINEER, AND SUBMITTED FOR BMP AS -BUILT APPROVAL.
I INVERT AT CREEK
555.00
CONCRETE ANTI SEEP
SECTION A -A
3.1
24" RCP
CONCRETE ANCHOR
ANTI -FLOTATION BLOCK
5.0'X 5.0'X 2.3'
POND 2 - STORMWATER BMP - SECTION
-WEIR OPEN ON ALL 4 SIDES.
AND FILTER BMP SUMMARY CHART -POND 2
PEAK CONTROL
STORM EVENT
TOTAL PRE DEVELOPMENT
RUNOFF
POST DEVELOPMENT
RUNOFF
POST -ROUTING RUNOFF
ELEVATION
TOP OF DAM
564.00
50YR-24H R
21.19
54.23
24.26
561.80
25YR-24H R
17.48
46.02
22.04
561.49
1 OYR-24H R
12.99
35.78
12.80
561.12
1 YR-24H R
4.10
13.99
0.54
560.36
BMP
REQUIRED
PROVIDED
ELEVATION
W Q V
6,653
6,698
559.45
SAND FILTER
352
360
TOP 559.00
SAND FILTER MAX ALLOWABLE BUA
81,648 sf
TOTAL IMPERVIOUS TO SAND FILTER
70,310 sf
3.5'' ORIFICE @ INV. E
TOP OF SAND ELEVATION - 5 .0_
ri rocr rnn
OUTLET STRUCTURE
EMERGENCY SPILLWAY)
ELEV. 563.0 6" DIAMETER
CLEANOUT (TYP.)
50YR=561.80 -
WQv ELEV. 559.45
TOP 559.0
ASTM C33 OR EQUIVALENT SAND
12" GRAVEL SECTION CONSISTS OF -
2" OF #89 WASHED CHOKING STONE -
10" OF #57 WASHED STONE
6" DIA. PERFORATED UNDERDRAIN - PVC
AASHTO M252 OR HDPE WITH SMOOTH INNER
WALL, WRAPPED WITH FILTER FABRIC.
PROVIDE 4" MIN. COVER OVER PVC
NORTH FACE
MANHOLE FOR ACCESS
PER NCDOT STANDARD
WEIR TO BE BLOCKED OFF WITH
STEEL PLATE DURING EROSION
CONTROL PHASES
RECTANGULAR WEIR. 560.3
(2.5' ON 2 SIDES)
LADDER RUNGS FOR ACCESS
PER NCDOT STANDARD
24" DIA RCP OUT
6" DIA ORIFICE
FROM SAND FILTER UNDERDRAIN
2:1 SIDE SLOPES BETWEEN FOREBAY & MAIN POND.
USE CLASS 1 RIP RAP OVER FILTER FABRIC.
LINE FOREBAY WITH 6" OF #57 STONE (WASHED)
/ LOT:18 \\ \\\ / \\ //
- - SF: 42,036 - - - x�_
/
%
\ I
\
`- - - - \ \ -\ \ \ \\ �/ 1 \ \ Eby `'6�56R�63yb2�b� • b� q I
I 5b
\ SEDIMENT POND BOTTOM
\ CHAMBER 1 \
\ \ STONE SEDIMENT DIKE ` \� 559.0'
\ \ \ BMP POND 2- Q�'// ti°Q
T AOJ/T�L \ SAND -564�
\s \ \ Osq� F�'O� CHAMBER 1 56�
\ / Sao - \ 36y \ \ \ OF360 SF SAND FILTER
x 62 \ \ \ 6" HIGH BERM - TYPE B EC STONE
LEVEL SPREADER ELEV. 559.50
S6�S6L?S6� s6�S6GSU9 C$ 2 //
\ __ _-100,
-
\\ UNDISTURBED
BUFFER
�x
XI
_559-'�
2 EgSFM� D
_556-
I
19.5
55
s BUFFER IMPACT #2
13SV, \ ` / y \ \ 690SF
STORMWATER BMP - ENLARGEMENT
NOTICE TO CONTRACTOR
PROVIDE AN UPDATED OUTLET STRUCTURE DETAIL CUT SHEET
FROM THE ENGINEER TO THE WATER QUALITY INSPECTOR
PRIOR TO CONSTRUCTION. THE UPDATED CUT SHEET SHALL
BE PROVIDED ON THE BMP AS -BUILT SUBMITTAL.
6" HIGH BERM - TYPE B EC STONE ROCK SEDIMENT DIKE
LEVEL SPREADER ELEV. 558.50 ELEV 561.0
3 �/
�I ,_Ako=
ROCK COFFER FOREBAY
TOP 564.0
I �i i� l I I NOTES:
OPEN WEB MAT AROUND UNDER 1. THE UNDERDRAIN COLLECTION SYSTEM SHOULD BE EQUIPPED WITH A 6-INCH MIN PERFORATED SCHEDULE 40 OR STRONGER PVC PIPE
DRAIN & GRAVEL BED (ALL SIDES) OR DOUBLE WALL HDPE PIPE. PERFORATIONS SHALL BE PER AASHTO M278 FOR PVC PIPE, AASHTO M252 FOR DOUBLE WALL HDPE PIPE
OR BE 3/8-INCH IN DIAMETER SPACED 3-INCHES ON CENTER ALONG 4 LONGITUDINAL ROWS THAT ARE SPACED 900 APART. THE PIPES
SHALL HAVE A MIN SLOPE ON 0.0% AND A MAXIMUM SPACING OF 10' ON CENTER.
SCARIFY SUBGRADE TO 6-9" MIN. & LEAVE
UNCOMPACTED IN ACCORDANCE WITH 2. PLACE THE SAND -BASED, WASHED BERMUDA SOD DIRECTLY ON THE SAND MIXTURE.
CHARLOTTE/MECKLENBURG BMP MANUAL
3. DO NOT USE TOPSOIL ON TOP OF THE SAND MEDIA.
4. CLEANOUTS OF 6-INCH SOLID PVC MUST BE PROVIDED FOR EVERY 50 LINEAR FEET OF UNDERDRAIN, AT ALL BENDS, AND ENDS OF THE
SYSTEM FOR MAINTENANCE PURPOSES. THE TOP OF THE CLEANOUTS SHOULD EXTEND 6 INCHES ABOVE THE TOP OF FILTER AND HAVE
WATERTIGHT, VANDAL -PROOF CAP. AT LEAST ONE CLEANOUT SHALL BE INSTALLED AS AN EMERGENCY DRAIN THAT IS FLUSH WITH THE
TOP OF THE FILTER AND HAVE A 6-INCH THREADED EXTENSION PIPE. THE FURTHEST CLEANOUT FROM THE OUTLET MUST HAVE THE
MINIMUM REQUIRED FILTER MEDIUM DEPTH.
w
565
565
�
�-L
EXISTING GRADE
PROPOSED GRADE
56C
56
INV
14FES2
INV
OUT:555.50
CS2
IN:555.00
55
90 LF OF 24"
RCP
55
#57 STONE ON
FILTER FABRIC
RIP -RAP APRON
LEVEL SPREADER
55C
55
�
00
Lq
O
�
c
CV
C1,
CD
10
1
04
O
10
uo
10
10
Ln
O
�
(�
O
LL
�
L9
��
�
LL
u?
LL
w
LU
LL
LU
LL
w
w
-0+50 0+00 0+50 1+00 1+50 1+75
POND 2 OUTFACE PROFILE
1"=40'
O
>,
c U
>
o
N
_a)
� O
�-
U c
Z O
M
U�
n,
�
N N
WykM
W-
N
N
I? w d
C) Z
�
N
SUN
J
LL
�
LU=
c
W
NoZw
<U
Q z:i
U U
J m
1
Q
Q
Q
U
o
�
O
0
N Lri
0�°
mwC�
v I
5 -4
�U>
U
cn O
L I�
0
u, Q
ZaN
�Qo
O
Z
w U
W
L
O -L0
2Q
zzzU
Z
J
10
`0
Q
J V
U
Z
CV �
7C)
^�
00
O
O
J
Q
N
W E
S
NORTH ARROW
0 15 30 60
GRAPHIC SCALE 1 "=30 FT.
`��111111111///
C A
O�°c°ES
ol
AL
° 23557 a =
_A °°o
o
O� ° !�G I NEB
D.
''//llllllllll`�
Z
p
V)
()
Z
J
i
z
Q
0
O
w
r-1
Z
00
O
N
c�
o
.
z
�
c
v
0
1
00
% `
zLU
�"p
O�>�
_
IL
5
Z
m
REVISIONS:
3-21-19 - NCDOT COMMENTS
6-1-19 - ACOE COMMENTS
9-12-19 - COUNTY UTILITY COMMENTS
10-24-19 - NCDOT COMMENTS
01-07-20 - NCDOT COMMENTS
0 1 -20-20 - STATE WQ COMMENTS
02-17-20 - COUNTY COMMENTS
03-20-20 - NCDOT COMMENTS
03-27-20 - UCPW & CNTY COMMENTS
06-30-20 - UCPW & CNTY COMMENTS
08-28-20 - UCPW & CNTY COMMENTS
09-17-20 - UCPW COMMENTS
1 1-16-20 - DOT 3PARTY COMMENTS
1 1-23-20 - FOR CONSTRUCTION REV 1
06-21-21 - DEQ MINOR MOD
C26 - BMP.DWG
PROJECT NUMBER:
217053
DATE: 08/9/2017
DRAWN BY: HFI
SHEET C 2 7
OF 35
C26 - BMP.DWG -PLOT: rusty - THU. 9-16-2021 3:53 PM

SAND FILTER NOTES
1. AVOID DISTURBING THE PROPOSED SAND FILTER AREA UNTIL AFTER THE INITIAL ROUGH GRADING AND TEMPORARY STABILIZATION HAS
BEEN PERFORMED.
2. EXCAVATE THE SAND FILTER TO THE DESIGN DIMENSIONS.
3. THE UNDERDRAIN SYSTEM SHALL BE EQUIPPED WITH 6-INCH MINIMUM PERFORATED SCHEDULE 40 OR STRONGER PVC PIPE, AASHTO M252
FOR DOUBLE WALL HDPE OR BE %" IN DIAMETER SPACED 3 INCHES ON CENTER ALONG 4 LONGITUDINAL ROWS THAT ARE SPACES 90"
APART. THE UNDERDRAIN PIPES SHALL BE INSTALLED AT 0% SLOPE.
4. SOIL AND GRAVEL COVER OVER THE UNDERDRAIN SHALL BE AT LEAST 3.0 FEET IN DEPTH.
5. GRAVEL BED MATERIALS (STONE) SIZE SHALL NOT BE GREATER THAN Y2 TO 1Y2 INCHES IN DIAMETER. (BLUE STONE, DOUBLE WASHED, #57)
6. FILTER FABRIC MUST MEET A MINIMUM PERMEABILITY RATE OF 75 GALLONS/MIN/SQUARE FOOT AND SHALL NOT IMPEDE THE INFILTRATION
RATE OF THE SOIL MEDIUM. NON -WOVEN FABRIC IS REQUIRED. INSTALLATION REQUIRES AT LEAST 1 FOOT OVERLAP AT THE ENDS AND
STRIKING IN PLACE DURING CONSTRUCTION AT THE TUNED SURFACES.
7. SOIL PREPARATION TO BE IN ACCORDANCE WITH CITY OF CHARLOTTE WATER QUALITY DESIGN MANUAL.
SAND FILTER MAINTENANCE
THE OWNER AND ALL SUBSEQUENT OWNERS OF THE PROPERTY SHALL ACCEPT RESPONSIBILITY AND MAINTENANCE OF ALL ON SITE SAND
FILTER AND BMP FACILITIES. THE OWNER WILL PROVIDE MAINTENANCE TO THE FACILITIES AS DESCRIBED IN THE PROJECT OPERATIONS AND
MAINTENANCE MANUAL AS WELL AS THE CITY OF CHARLOTTE STORMWATER ORDINANCE AND THE MECKLENBURG COUNTY BMP
MANUAL.
2. BMP SHALL BE PERIODICALLY INSPECTED BY THE OWNER OR OWNER'S REPRESENTATIVE AS DESCRIBED IN THE MAINTENANCE MANUAL
AND SCHEDULE TO IDENTIFY MAINTENANCE AND REPAIR NEEDS AND TO ENSURE COMPLIANCE WITH THE REQUIREMENTS OF THE
MAINTENANCE SCHEDULE. ANY IDENTIFIED MAINTENANCE AND/OR REPAIR NEEDS SHALL BE ADDRESSED IN A TIMELY MANNER. RECORDS
SHALL BE MAINTAINED BY THE OWNER AND REVIEWED BY COUNTY PERSONNEL WHEN REQUESTED.
REPAIR TO THE EXISTING SAND FILTERS
1. THE CONTRACTOR SHALL RE -CONSTRUCT THE EXISTING SAND FILTER PER THESE CONSTRUCTION PLANS AND PER THE CHARLOTTE AND
MECKLENBURG COUNTY BEST MANAGEMENT PRACTICES DESIGN MANUAL. FOR MORE SPECIFIC INFORMATION ON THE CONSTRUCTING
AND MATERIALS FOR THE SAND FILTER, REFER TO SAND FILTER SPECIFICATIONS FOR THIS PROJECT.
2. WHEN BACKFILLING THE FACILITY, SOIL SHOULD BE PLACED IN LIFTS 12 TO 18 INCHES DEEP. HEAVY EQUIPMENT SHOULD NOT BE PLACED
WITHIN THE SAND FILTER BASIN. HEAVY EQUIPMENT CAN BE USED AROUND THE PERIMETER OF THE BASIN TO SUPPLY SOILS AND SAND.
WITHOUT SOME COMPACTION, DIFFERENTIAL SETTLEMENT MAY OCCUR. SAND FILTER MATERIALS SHOULD BE GRADED WITH LIGHT
EQUIPMENT SUCH AS COMPACT LOADER OR DOZER / LOADER WITH MARSH TRACKS. IN ADDITIONS, PRESOAKING OF THE FACILITY
SHOULD BE USED TO HELP SETTLE THE MATERIAL.
INSPECTION NOTES
1. INSPECTIONS SHALL BE CONDUCTED AS PRESCRIBED BY THE MAINTENANCE COVENANT. ADDITIONAL INSPECTIONS MAY BE CONDUCTED
BY MECKLENBURG COUNTY ON ANY REASONABLE BASIS, INCLUDING BUT NOT LIMITED TO: ROUTINE INSPECTIONS; RANDOM
INSPECTIONS; INSPECTIONS BASED UPON COMPLAINTS OR OTHER NOTICE OF POSSIBLE VIOLATIONS; INSPECTIONS OF DRAINAGE BASINS
OR AREAS IDENTIFIED AS HIGHER THAN TYPICAL SOURCES OF SEDIMENT OR OTHER CONTAMINANTS OR POLLUTANTS; INSPECTIONS OF
BUSINESSES OR INDUSTRIES OF A TYPE ASSOCIATED WITH HIGHER THAN USUAL DISCHARGES OR POLLUTANTS OR WITH DISCHARGES OF A
TYPE WHICH ARE MORE LIKELY THAN THE TYPICAL DISCHARGE TO CAUSE VIOLATIONS OF STATE AND FEDERAL WATER QUALITY
STANDARDS OR THE NPDES STORM WATER PERMIT; AND JOINT INSPECTIONS WITH OTHER AGENCIES UNDER ENVIRONMENTAL AND SAFETY
LAWS. INSPECTIONS MAY INCLUDE BUT ARE NOT LIMITED TO: REVIEWING MAINTENANCE AND REPAIR RECORDS; SAMPLING DISCHARGES,
SURFACE WATER, GROUNDWATER, AND MATERIAL OR WATER IN BMPS; EVALUATING THE CONDITION OF THE BMPS AND STORMWATER
MANAGEMENT PRACTICES.
2. RIGHT-OF-WAY ENTRY FOR INSPECTION, WHEN ANY NEW BMP IS INSTALLED, THE PROPERTY OWNER SHALL GRANT TO MECKLENBURG
COUNTY THE RIGHT TO ENTER THE PROPERTY AT REASONABLE TIMES AND IN A REASONABLE MANNER FOR THE PURPOSES OF INSPECTION.
THIS INCLUDES THE RIGHT TO ENTER A PROPERTY WHEN THE MECKLENBURG COUNTY HAS A REASONABLE BASIS TO BELIEVE THAT A
VIOLATION OF THIS REGULATION IS OCCURRING OR HAS OCCURRED, AND TO ENTER WHEN NECESSARY FOR ABATEMENT OF A PUBLIC
NUISANCE OR CORRECTION OF A VIOLATION OF THIS REGULATION.
STORM DRAINAGE AS -BUILT REQUIREMENTS
1. THE CONTRACTOR SHALL FURNISH AN AS -BUILT SURVEY OF THE STORM DRAINAGE AND BIORETENTION BASIN IN PRINTED HARD COPY
AND CAD FILE FORMAT, SIGNED AND SEALED BY A LAND SURVEYOR LICENSED IN NORTH CAROLINA. THE CAD FILE SHALL BE BASED ON
NC GRID, NAVD 1983 (TIED TO STATE PLANE COORDINATE SYSTEM). ELEVATIONS SHALL BE TIED TO NAVD88.
2. THE AS -BUILT SURVEY SHALL PROVIDE THE FOLLOWING INFORMATION: STORM DRAINAGE PIPE LOCATIONS WITH SIZE, LENGTH, AND
MATERIAL; STORM DRAINAGE INLET, OUTLET, AND CLEAN OUT STRUCTURE LOCATIONS WITH RIM AND INVERT ELEVATIONS AT EACH PIPE,
WITH INVERT AND TOP OF WEIR ELEVATION FOR ANY INTERNAL BAFFLE WALLS INSIDE OF STRUCTURE; FINISHED GRADE CONTOURS OF
BIORETENTION BASIN AT 1 FOOT INTERVALS, WITH SQUARE FOOTAGE OF THE BASIN; INSIDE DIMENSIONS OF INLET AND OUTLET STRUCTURES
WITHIN THE BASIN AT 25 FOOT INTERVALS MAXIMUM.
3. THE AS -BUILT SURVEY SHALL BE SUBMITTED TO THE DESIGN ENGINEER AT LEAST 45 DAYS PRIOR TO THE ANTICIPATED DATE OF COMPLETION
OF OCCUPANCY.
BMP CONSTRUCTION SEQUENCE NOTES
1. CALL THE WATER QUALITY INSPECTOR TO SET UP A BMP PRE -CONSTRUCTION MEETING PRIOR TO STARTING ANY
WORK ON BMPS. THIS MEETING SHOULD TAKE PLACE AT LEAST 48 HOURS PRIOR TO STARTING CONSTRUCTION
ON ANY BMP AND SHALL INCLUDE THE DESIGN ENGINEER TO ENSURE ENGINEER INSPECTIONS ARE PERFORMED
AT KEY BMP INSTALLATION PHASES.
2. THE DESIGN ENGINEER MUST VERIFY AND CERTIFY THE DRAINAGE AREA IS PROPERLY STABILIZED; MEASURES
ARE IN PLACE TO PREVENT SEDIMENTATION INTO THE BMP, THE STORM DRAINS, INLETS AND PAVEMENT HAVE
BEEN PROPERLY CLEANED PRIOR TO COMMENCEMENT OF BMP CONSTRUCTION.
3. ADDITIONAL MEASURES, TO ENSURE PROPER CONSTRUCTION AND OPERATION OF THE BMP, MAY BE REQUIRED
BY THE WATER QUALITY INSPECTOR.
4. A DOUBLE -RINGED INFILTROMETER TEST (ASTM D 3385), OF THE BOTTOM OF THE SAND FILTER, MUST BE
SUBMITTED TO THE WATER QUALITY INSPECTOR PRIOR TO THE INSTALLATION OF THE UNDERDRAIN SYSTEM.
5. THE RESULTS OF THE DOUBLE -RINGED INFILTROMETER TEST MUST SHOW INFILTRATION CAPABILITIES, CONFIRMED
BY THE DESIGN ENGINEER, AND SUBMITTED FOR BMP AS -BUILT APPROVAL.
INVERT AT CREEK
500
CONCRETE ANTI SEEP
ELEV. 558.0
-50YR= 558.06
-WEIR OPEN ON ALL 4 SIDES.
EMERGENCY SPILLWAY)
WQv ELEV. 555.56
24" RCP
TOP 555.0
SAND FILTER BMP SUMMARY CHART - POND 3
PEAK CONTROL
STORM EVENT
TOTAL PRE DEVELOPMENT
RUNOFF
POST DEVELOPMENT
RUNOFF
POST -ROUTING RUNOFF
ELEVATION
TOP OF DAM
559.00
50YR-24 H R
14.53
43.74
30.26
558.06
25YR-24 H R
12.01
37.12
23.66
557.85
1 OYR-24 H R
8.93
28.86
14.89
557.71
1 YR-24 H R
2.82
11.28
0.70
556.69
BMP
REQUIRED
PROVIDED
ELEVATION
W QV
4,761
4,790
555.56
SAND FILTER
252
260
TOP 555.00
SAND FILTER MAX ALLOWABLE BUA
58,968 sf
TOTAL IMPERVIOUS TO SAND FILTER
48,640 sf
EL. - 558.0
3.5" ORIFICE @ INV. E
TOP OF SAND ELEVATION
EL. 551.50
OUTLET STRUCTURE
6" DIAMETER
CLEANOUT (TYP.)
ASTM C33 OR EQUIVALENT SAND
CONCRETE ANCHOR 12" GRAVEL SECTION CONSISTS OF -
SECTION A -A 2" OF #89 WASHED CHOKING STONE -
ANTI -FLOTATION BLOCK 10" OF #57 WASHED STONE
5.0'X 5.0'X 2.3'
6" DIA. PERFORATED UNDERDRAIN - PVC
AASHTO M252 OR HDPE WITH SMOOTH INNER
POND 3 - STORMWATER BMP -SECTION TH FILTER FABRIC.
PROVDE4"MIN ICOVEROV OVER C
OPEN ON ALL SIDES
NORTH FACE
6" HIGH BERM - TYPE B EC STONE
LEVEL SPREADER ELEV. 558.50
OPEN WEB MAT AROUND UNDER
DRAIN & GRAVEL BED (ALL SIDES)
ELEV
SCARIFY SUBGRADE TO 6-9" MIN. & LEAVE
UNCOMPACTED IN ACCORDANCE WITH
CHARLOTTE/MECKLENBURG BMP MANUAL
MANHOLE FOR ACCESS
PER NCDOT STANDARD
WEIR TO BE BLOCKED OFF WITH
STEEL PLATE DURING EROSION
CONTROL PHASES
RECTANGULAR WEIR550
(2.5'ON 2 SIDES)
LADDER RUNGS FOR ACCESS
PER NCDOT STANDARD
24" DIA RCP OUT
6" DIA ORIFICE
FROM SAND FILTER UNDERDRAIN
NOTICE TO CONTRACTOR
PROVIDE AN UPDATED OUTLET STRUCTURE DETAIL CUT SHEET
FROM THE ENGINEER TO THE WATER QUALITY INSPECTOR
PRIOR TO CONSTRUCTION. THE UPDATED CUT SHEET SHALL
BE PROVIDED ON THE BMP AS -BUILT SUBMITTAL.
2:1
SIDE SLOPES
BET
W
EEN FOR
EBAY
&
M
AIN POND
.
USE CLASS 1 RIP RAP OVER FILTER FABRIC.
LINE FOREBAY WITH 6" OF #57 STONE (WASHED)
ENT DIKE
ROCK COFFER FOREBAY
1,17
\ \/I/ /\\
I
\ I \/ \ \ \\ \ / I
o\/`
\\I \I
\/\
/
I I
►I
\
\\
\\I\ II
\\
\\ \
I I\I
\
\
\
\
\
II \\
\ \ \\\
\
\
\\
I
\ 1 \
\
i\I\
1\/\ \ `
\
\\�I
\
I
\
\\\
\
\
\
I \
\I
\\I
\
\
\ \\ \\\ II I i\
ce
\f
\\\ \ 2 \I
,
\�
Q\ \�
p\
G�,
\
�\
� \
\A\
\y\
�
\
�
\\O
'\ T
L
j�FTc\o�O
\
\
\
\
n\
\\,
c
r
\
_
�
\
-L\ \
o°- \/
\\s
�
�P\ \\
G
\ \ \
'
\
\
\\ \
\
\\
\
\
\
\\
s
\
\I- \�
\� \\ \ / 1
s
\
\
\
1
\I
I
►I
I\
\
\
I
IIII
I
_
\
\
`\
\I I
- I
'\ I
,
1
I\
I\
\
I
\I�I l I\ I
/
(I
Il I
II 1 �/\\�1
N�I/
L
Lo
/xs, �\ssSEDIMENT
CHAMBER 1 � �
\\/\O� Qc
Ul
s POND BOTTOM .
\\
\`
�\
�
?
�
\
/
/
5
6
$
�
/
I
(
/
/
/
/
/
�/
/
r
/
/ �
/
/
�
/
/
/
/
/
/
/
//
I
s
/
n
/'
�
11
/
1'
1
1
\
I
\
/
1
�
=
o\
�
v
/
/
I
l
`
Io
I
'
\
\
\
\
\
3
I
�
\
1
\
1►
I I
\
\
\
.
pI5
I
5
I
pI5
.
5
0
I
I 1
i T\
I
I 11
I
\
II
I
I
\
I
I
II � I
II\ I
/
\
I\
\
/I
5
n6" HIGH BERM -TYPE B EC STONE INVLEVEL SPREADER ELE
�260 SF SAND FILTER 26' CS�OBMPPOND 3
\
E1VM\
SAND
CHAMBER 1 BUFFER IMPACT #3
STONESEDIMENTDKE 20'
10 F FES 310
41,
1,121 SF
Z_
,
\
l
tt �
\1
\\
\�\`
4
\
._
I I I \ I I \ 1
co
/
/
/
/
l
1
-
�
/
_
/
I
1
/
/
/I
I
I
\
/
STORMWATER BMP - ENLARGEMENT
TOP 559.0
NOTES:
1. THE UNDERDRAIN COLLECTION SYSTEM SHOULD BE EQUIPPED WITH A 6-INCH MIN PERFORATED SCHEDULE 40 OR STRONGER PVC PIPE
OR DOUBLE WALL HDPE PIPE. PERFORATIONS SHALL BE PER AASHTO M278 FOR PVC PIPE, AASHTO M252 FOR DOUBLE WALL HDPE PIPE
OR BE 3/8-INCH IN DIAMETER SPACED 3-INCHES ON CENTER ALONG 4 LONGITUDINAL ROWS THAT ARE SPACED 900 APART. THE PIPES
SHALL HAVE A MIN SLOPE ON 0.0% AND A MAXIMUM SPACING OF 10' ON CENTER.
2. PLACE THE SAND -BASED, WASHED BERMUDA SOD DIRECTLY ON THE SAND MIXTURE.
3. DO NOT USE TOPSOIL ON TOP OF THE SAND MEDIA.
4. CLEANOUTS OF 6-INCH SOLID PVC MUST BE PROVIDED FOR EVERY 50 LINEAR FEET OF UNDERDRAIN, AT ALL BENDS, AND ENDS OF THE
SYSTEM FOR MAINTENANCE PURPOSES. THE TOP OF THE CLEANOUTS SHOULD EXTEND 6 INCHES ABOVE THE TOP OF FILTER AND HAVE
WATERTIGHT, VANDAL -PROOF CAP. AT LEAST ONE CLEANOUT SHALL BE INSTALLED AS AN EMERGENCY DRAIN THAT IS FLUSH WITH THE
TOP OF THE FILTER AND HAVE A 6-INCH THREADED EXTENSION PIPE. THE FURTHEST CLEANOUT FROM THE OUTLET MUST HAVE THE
MINIMUM REQUIRED FILTER MEDIUM DEPTH.
56C
56
PROPOSED
GRADE
Ti
EXISTING GRADE
55
55
OF FES
IN:551.00
3
INV
CS 3
INV OUT:551.50
#57
FILTER
STONE ON
FABRIC
86 LF OF 24" RCP
55C
55
RIP -RAP APRON
LEVEL SPREADER
54
54
q
O
a
a
Lo�
.p
L?
.p
L9
�
L?
U")u0
L?
L?
�
L9
OCR
w
U_
wU_
w�
w�
0+00 0+50 1+00 1+50
POND 3 OUTFACE PROFILE
1"=40'
o
5,
CD U
N
ao O
CV
U c
O
M
U01)
Lk 7
W
N
-
N
6� CL
z
wLU
�
N
SUN
J 2
LLw<U
rn
v,
Lc
) -
-
2 W
LU
J m
U
04
O
o Lr5
CV �
o
C�
mUw00
v I
�U>
U
cn O
L I�
0
u, Q
ZaN
U Q
Z
w U
LO��/�
zzzU
Q
-0
JZ
:z
Q
J �
z
CV �
70
00
O
O
�
J
Q
N
W E
S
NORTH ARROW
0 15 30 60
7,11
GRAPHIC SCALE 1 "=30 FT.
` � o
AL
° 23557 0 =
°° 71212,121 °
°�a °
!�G I
FNEB
Z
O
V)
()
U
z
J
z
0
Nt
�
O
W
CIO
0,
r--%
z
0
000
O
(y)
C/)
o
z
Q
r
v
0
1
00
z
z
O�>�
_
I�
5
Z
m
REVISIONS:
3-21-19 - NCDOT COMMENTS
6-1-19 - ACOE COMMENTS
9-12-19 - COUNTY UTILITY COMMENTS
10-24-19 - NCDOT COMMENTS
01-07-20 - NCDOT COMMENTS
0 1 -20-20 - STATE WQ COMMENTS
02-17-20 - COUNTY COMMENTS
03-20-20 - NCDOT COMMENTS
03-27-20 - UCPW & CNTY COMMENTS
06-30-20 - UCPW & CNTY COMMENTS
08-28-20 - UCPW & CNTY COMMENTS
09-17-20 - UCPW COMMENTS
1 1-16-20 - DOT 3PARTY COMMENTS
1 1-23-20 - FOR CONSTRUCTION REV 1
06-21-21 - DEQ MINOR MOD
C26 - BMP.DWG
PROJECT NUMBER:
217053
DATE: 08/9/2017
DRAWN BY: HFI
SHEET C 28
OF 35
C26 - BMP.DWG -PLOT: rusty - THU. 9-16-2021 3:53 PM

DEPRESSED RIP -RAP APRON
TO ACT AS SWALE (SEE PIPE
PROFILES ON SHEET C26-28)
- • `
�a
6ft
Figure 2: CrossmSection of an LSmFS
1 ft 3 Q
L�xee,- 1 S.preader
r
Appropriately [zed
Fioc ter (SIZED BY OTHERS)
LEVEL SPREADER TOP SET
AT MINIMUM OUTFALL
ELEVATION
30 or so ft
Vegetative Filter Stf-ip
IL
EXISTING
UNDISTURBED
VEGETATION
O
c U
O N
VD
N O
o
c)
w
c
N
��3wJ
Z
LL
c
LED=—
�
JOB
—_
Q
p
p coc�
N
��O
OU
o O
N
oUm
mU0
��//��
vI
��
zU>
w�
}
w Q
Z w v�
(VIJ,
z
z z
wUQ
L
L
Z
z
�
Q
Z
Q
J Lri
C)
N
r-
7C)
^ V
00 O
�
O
�
J
Q
N
W E
S
NORTH ARROW
0 15 30 60
GRAPHIC SCALE 1"=30 FT.
W1111111///
N C
O� °o° Es °
AL -_
o 23557
°
_A °
�o°��
°° FNGINE�
Z
O
U
V)
z
>
z
z
0o
0
J
m�
Q
::D
�o
V)oZw
0�
o
J
00
Z
w
U
N
^^
1..�
CN
Q
O��
m
0
Z
3�1
REVISIONS:
3-21-19 - NCDOT COMMENTS
6-1-19 - ACOE COMMENTS
12-19 -
COUNTY UTILITY COMMENTS
0-24-19
- NCDOT COMMENTS
01-07-20
- NCDOT COMMENTS
0 1 -20-20
- STATE WQ COMMENTS
02-17-20
- COUNTY COMMENTS
03-20-20
- NCDOT COMMENTS
03-27-20
- UCPW & CNTY COMMENTS
06-30-20
- UCPW & CNTY COMMENTS
08-28-20
- UCPW & CNTY COMMENTS
)9-17-20
- UCPW COMMENTS
1 1-16-20
- DOT 3PARTY COMMENTS
1 1-23-20
- FOR CONSTRUCTION REV 1
06-21-21
- DEQ MINOR MOD
C26 - BMP.DWG
PROJECT NUMBER: 217053
DATE: 08/9/2017 DRAWN BY: HFI
SHEETC28 AOF 3
C26 - BMP.DWG -PLOT: rusty - THU. 9-16-2021 3:53 PM