20051068 Ver 3_More Info Received_20170323

MEMORANDUM
TO: Sue Homewood
Division of Water Resources, Winston Salem Regional Office
Department of Environmental Quality
FROM: Scott Gregory
Geoscience Group, Inc.
REFERENCE: Afton Ridge 11, Building 1: BMP2
DATE: March 23, 2017
• Rease provide a contact name, company and mailing addressfor the responsible party
for the 9VI P.
The BMPresponsible party is noted on sheet C2.2
•
A properly executed Operation and Maintenance Agreement is required.
See attachment and sheet C4.1 for maintenance notes
• The new MDCfor wet ponds requiresthat the dam structure be vegetated with non -
dumping turf grass but the planscall for a riparian seed mix.
Sae note on BMPsection sheet G1.1
• The plans must include a construction sequence for complete dean out of the sediment
basin and conversion to the final wet pond dimensionsand specifications.
See note on sheet C2.2
• The new MDCindicatesthat the inlet and the outlet should be designed in a manner to
avoid short circuiting, however one of the forebays is adjacent to the outlet structure.
This existing BMP2 was constructed in 2004. The existing riser and 48"concrete pipe
are to remain in place for sediment control and to maintain conveyance for the existing
pond on the adjacent property. From structure 99, there is approximately 170' of travel
way to the existing riser and should be adequate.
• The MDCfor all 9CMs state that the side slopes of all 9CMsshall be no steeper than 3:1
but your plans indicate 2:1. Rease see 15A NCACO2H .1050(3).
Figure 2 in the manual "recommends" a 3:1 side slope. The existing outside
embankment with a 2:1 slope isto remain as is and the dam will be raised and seeded
on a consistent 2:1 slope

BMP PLANTING
NOTE: NEW DISTURBED AREAS TO RAISE THE DAM SHALL
BE SEEDED WITH "NON CLUMPING TURF GRASS"
i
2
1 F
PROP.THROAT
ELEV=621.50
TOP DAM=622.5
10'
EXIST.36"RCP
EX.THROAT::�kr
ELEV=617.3.3 L
3"PVC \
NEW.3"ORIFICE ELEV: 617.50
WATER SURFACE 3"ORIFICE ELEV: 617.50 O
EX.18"SLUICE GATE
INV.=613.61
2
1
T
GENERAL NOTES:
1. SEDIMENT SHALL BE REMOVED AND TRAP
RESTORED TO ITS ORIGINAL DIMENSIONS
WHEN THE SEDIMENT HAS ACCUMULATED
TO 1/2 THE DESIGN DEPTH OF THE TRAP.
2. REMOVED SEDIMENT SHALL BE DEPOSITED
IN A SUITABLE AREA AND IN SUCH A
MANNER THAT IT WILL NOT ERODE.
3. THE STRUCTURE SHALL BE INSPECTED BY
THE FINANCIALLY RESPONSIBLE PARTY OR
HIS AGENT AFTER EACH STORM EVENT
AND REPAIRS MADE AS NECESSARY.
4. CONSTRUCTION OPERATIONS SHALL BE CARRIED
OUT IN SUCH A MANNER THAT EROSION AND
WATER POLLUTION ARE MINIMIZED.
5. THE SEDIMENT TRAP SHALL BE REMOVED AND
THE AREA STABILIZED WHEN THE DRAINAGE
BASIN HAS BEEN PROPERLY STABILIZED.
6. ON LARGER DRAINAGE AREAS RIP RAP MAY
BE REQUIRED UNDER THE WASHED STONE.
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BASIN
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12" MIN.
a CATCH
BASIN
3'-4'
SECTION A -A
INLET PROTECTION
NOTES:
1. CLASS OR MEDIAN SIZE OF RIPRAP AND LENGTH, WIDTH AND DEPTH OF APRON
TO BE DESIGNED BY THE ENGINEER.
2. REFER TO NC EROSION CONTROL MANUAL FOR DESIGN STANDARDS
3. RIPRAP 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 RIPRAPPED
SHALL BE UNDERCUT SO THAT THE INVERT OF THE APRON SHALL BE AT THE
SAME GRADE (FLUSH) WITH THE SURFACE OF THE RECEIVING CHANNEL. THE
APRON SHALL HAVE A CUTOFF OR TOE WALL AT THE DOWNSTREAM END.
5. THE WIDTH OF THE END OF THE APRON SHALL BE EQUAL TO THE BOTTOM
WIDTH OF THE RECEIVING CHANNEL. MAXIMUM TAPER TO RECEIVING CHANNEL 5:1
6. ALL SUBGRADE FOR STRUCTURE TO BE COMPACTED TO 95% OR GREATER.
7. THE PLACING OF FILL, EITHER LOOSE OR COMPACTED IN THE RECEIVING
CHANNEL SHALL NOT BE ALLOWED.
8. NO BENDS OR CURVES IN THE HORIZONTAL ALIGNMENT OF THE APRON
WILL BE PERMITTED.
PLAN
9. FILTER FABRIC SHALL BE INSTALLED ON COMPACTED SUBGRADE PRIOR TO
PLACEMENT OF RIP RAP.
10. ANY DISTURBED AREA FROM END OF APRON TO RECIEVING CHANNEL
MUST BE STABILIZED. ° x StAPE
OUTLET
La
W1
W2
*T
H
RIP -RAP
DITCH
MIN.
VELOCITY
REMARKS
2:1
WIDTH RATIO
SIDE SLOPE SIDE SLOPE
SLOPE
(CFS)
T.
T.
T.
(FPS)
MIN.
LT
TSDI
2
2
2%
17.3
1.1
S23
10'10'
4.6
2'
8"
2
AVG.SIZE 6"
S9
38'
1 18'
1 4'
1.3
2
AVG.SIZE 12"
Maintenance Inspect inlets at least weekly and after each Significant ('/2 inch of greater)
rainfall event. Clear the mesh wire of any debris or other objects to provide
adequate flow for subsequent rains. Take care not to damage or undercut the
wire mesh during sediment removal. Replace stone as needed.
TEMP./PERM DITCHES
Maintenance Inspect temporary diversions once a week and after every rainfall. immediately
remove sediment from the flow area and repair the diversion ridge. Carefully
check outlets and make timely repairs as needed. when the area protected is
permanently stabilized, remove the ridge and the channel to blend with the
natural ground level and appropriately stabilize it.
PLANTING SCHEDULE
L
C
1 n'AA IKI
PLAN
' MIN.
I. .
MIN
Fla .. FABRIC LAP
(IF NEEDED)
ELEVATION
NANRAL GRADE
RP RAP
H �I
T (THICKNESS)
* d50 (see fig 8.06 a&b "NC SEDIMENT AND EROSION CONTROL MANUAL"
dmax = 1.5 x d50
T = 1.5 X dmax. MIATE: LTER FABRIC
MINIMUM H-2/3 PIPE OLAMPER APER OF Fl
SECTION B -B
RIPRAP APRON AT PIPE OUTFALLS
OTHER THAN AT SWIM
STAPLES 1/8"DIA.4"
RANDOM SPACED
12" O.C.
LINE INTERIOR AND
AROUND STRAW BALES
WITH 6 MIL. BLACK
PLASTIC
BINDING WIRE
TRAW BALE, TYP.' STRAW BALE
SOIL TO SUPPORT WOOD OR METAL
PLASTIC AND PREVENT STAKING(2 PER BALE)
PUNCTURE
SECTION B -B
V-6• MIN.
�CONCRETE� NOTES:
II II 1. PLACE ON LEVEL GROUND
II WASHOUT 2. INSTALL SIGN WITHIN 30' OF
WASHOUT BASIN
3. CLEAN OUT BASIN WHEN 50% FULL
4. INSPECT BASIN MIN. ONCE A WEEK
5. INSTALL SILT FENCE AROUND
PERIMETER OF BASIN EXCLUDING THE
SIDE USED FOR ACCESS
CONCRETE WASHOUT SIGN DETAIL 6. PLACE BASIN NEAR CONSTRUCTION
ENTRANCE
CONCRETE WASHOUT DETAIL
NOT TO SCALE
SYM.
DITCH #
LEFT
RIGHT
CHANNEL
010
p OW
DITCH
MIN.
VELOCITY
REMARKS
2:1
WIDTH RATIO
SIDE SLOPE SIDE SLOPE
SLOPE
(CFS)
T.
T.
T.
(FPS)
MIN.
LT
TSDI
2
2
2%
17.3
1.1
1.6
0
4.6
USE NAG S150
PICKERELWEED
TSD2
2
2
2%
17.3
1.1
1.6
0
4.6
USE NAG S150
1502 SF
PD1
3
3
2%
10.3
0.8
1.5
2
2.8
USE NAG S150
O
PD2
2
2
1%
3.5
0.6
1.5
2
1.7
USE NAG S150
TEMP./PERM DITCHES
Maintenance Inspect temporary diversions once a week and after every rainfall. immediately
remove sediment from the flow area and repair the diversion ridge. Carefully
check outlets and make timely repairs as needed. when the area protected is
permanently stabilized, remove the ridge and the channel to blend with the
natural ground level and appropriately stabilize it.
PLANTING SCHEDULE
L
C
1 n'AA IKI
PLAN
' MIN.
I. .
MIN
Fla .. FABRIC LAP
(IF NEEDED)
ELEVATION
NANRAL GRADE
RP RAP
H �I
T (THICKNESS)
* d50 (see fig 8.06 a&b "NC SEDIMENT AND EROSION CONTROL MANUAL"
dmax = 1.5 x d50
T = 1.5 X dmax. MIATE: LTER FABRIC
MINIMUM H-2/3 PIPE OLAMPER APER OF Fl
SECTION B -B
RIPRAP APRON AT PIPE OUTFALLS
OTHER THAN AT SWIM
STAPLES 1/8"DIA.4"
RANDOM SPACED
12" O.C.
LINE INTERIOR AND
AROUND STRAW BALES
WITH 6 MIL. BLACK
PLASTIC
BINDING WIRE
TRAW BALE, TYP.' STRAW BALE
SOIL TO SUPPORT WOOD OR METAL
PLASTIC AND PREVENT STAKING(2 PER BALE)
PUNCTURE
SECTION B -B
V-6• MIN.
�CONCRETE� NOTES:
II II 1. PLACE ON LEVEL GROUND
II WASHOUT 2. INSTALL SIGN WITHIN 30' OF
WASHOUT BASIN
3. CLEAN OUT BASIN WHEN 50% FULL
4. INSPECT BASIN MIN. ONCE A WEEK
5. INSTALL SILT FENCE AROUND
PERIMETER OF BASIN EXCLUDING THE
SIDE USED FOR ACCESS
CONCRETE WASHOUT SIGN DETAIL 6. PLACE BASIN NEAR CONSTRUCTION
ENTRANCE
CONCRETE WASHOUT DETAIL
NOT TO SCALE
SYM.
PLANTED AREA
QTY.
BOTANICAL NAME
COMMON NAME
ROOT/CONTAINER
SPACING REMARKS
Late winter: February 15 - April 15
MIN.
SEEDING
LENGTH TO
2:1
WIDTH RATIO
15 lbs/acre hulled Bermudagrass
MAX.
imbalance is responsible.
LENGTH TO
6:1
WIDTH RATIO
tall fescue is very effective.
MIN.
LT
1093 SF
129
SAURURUS CERNUUS
LIZARD TAIL
2" PLUG OR EQUIV. CONTAINER
2 FT OC SEE NOTE BELOW FOR AVAIL.
PW
1038 SF
526
PONTEDERIA CORDATA
PICKERELWEED
2" PLUG OR EQUIV. CONTAINER
3 FT. OC
PV
1396 SF
546
PELTANDRA VIRGINICA
TUCKAHOE, GREEN ARUM
2" PLUG OR EQUIV. CONTAINER
24" OC, STAGGERED ROWS
SL
1502 SF
621
SAGITTARIA LATIFOLIA
ARROWHEAD, DUCK POTATO
2" PLUG OR EQUIV. CONTAINER
24" OC, STAGGERED ROWS
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** QUANTITIES ARE FOR CONVENIENCE ONLY, CONTRACTOR IS RESPONSIBLE FOR ACTUAL PLANT MATERIAL SHOWN ON PLANS.
NOTE: LANDSCAPE CONTRACTOR SHALL ESTABLISH QUANTITIES BASED ON ACTUAL AREA TO BE PLANTED AND PLANT SPACING INDICATED ABOVE.
PROVIDE START-UP MAINTENANCE FOR PLANTINGS, INCLUDING TEMPORARY IRRIGATION OR HAND WATERING, UNTIL PLANTS ARE ROOTED AND GROWTH IS ESTABLISHED.
PLANTS ARE AVAILABLE FROM MELLOW MARSH FARM SILER CITY NC [phone] WWW.MELLOWMARSHFARM.COM
- Immediately after the wet detention basin is established, the plants an the
vegeta#ed shelf and per meter of the basin should be watered # ice "-eeki3' A
needed, until the plants become established (commonly six weeks).
Itiio portion of the wet detention pond should be fertilized after the first initial
fertilization that is required to establish the plants on the vegetated shelf. 4
Stable groundcover should be maintained in the drainage area to reduce the
sediment load to the wet detention Basin.
EXTENSION SIDESLOPES 2.5:1
6'VEGETATED SHELF
EX.CONTROL STRUCTURE,SEE DETAIL SEDIMENT DEPTH AROUND MAIN POOL
INDICATOR SEE PLANTING PLAN
6:1 SLOPE
- - - - - - - - - - --------- TEMPORARY POOL ELEV=618.62FOREBAY
-------------- �--------------------- - - - - - - - - - - - - - - - - - - - - - --�1�--------------------------------------
NORMAL POOL=617.50
BOTT.SHELF: 617 TOP SHELF: 618
TEMP SKIMMER MAX.STORAGE = 615.00 2
SEE DTL.THIS SHEET 2 1
1
PERM.BOTTOM ELEV. 614.0
SKIMMER.INV=613.5(BORE)
PERM.BOTTOM ELEV.=613
SEDIMENT STORAGE GRADE TO 613.0
GRADE TO 612.0
MODIFY BMP #2
NOT TO SCALE
NOTES:
1. EXISTING TRASH RACK TO BE REUSED
2. SLUICE GATE VALVE STEM TO BE EXTENTED
3. RAISIING OF EXISTING OUTLET STRUCTURE TO
BE DESIGNED BY LICENSED PE WITH SHOP
DRAWINGS SUBMITTED PRIOR TO CONSTRUCTION
4. SKIMMER ORIFICE TO BE GROUNTED IN AT JOB
FINISH WITH NON -SHRINK GROUT.
5. AN AS -BUILT SURVEY OF THE BMP AND THE
OUTLET STRUCTURE TO BE PROVIDED TO THE
ENGINEER AND APPROVED BY NCDENR AND CITY
OF KANNAPOLIS
30"WEIR ELEV.619.40 TYP.
EXIST. 4'X4'(INSIDE) CONCRETE
OUTLET STRUCTURE
/ 1
I I EX.36" RCP
EX.INV.613.28 /
MODIFY PRE -CAST DETENTION OUTLET PRE -CAST DETENTION OUTLET STRUCTURE(BMPM
NOT TO SCALE
R:\Drawings\2016 Projects\Afton Ridge bldg.1\AFTON2.28.17.dwg, 3/23/2017 11:02:26 AM, 1:40
W)
EXIST. 4'X4'(INSIDE) CONCRETE
OUTLET STRUCTURE AND HOOD(RE-USE
EX.THROAT
ELEV=617.33
3"ORIFICE ELEV: 616.16 \
3"ORIFICE ELEV: 616.16 0
/ 1
I EX.36"RCP
I
18"SLUICE GATE EX.INV.613. /
INV.=613.61
AS -BUILT PRE -CAST DETENTION OUTLET PRE -CAST DETENTION OUTLET STRUCTURE(BMPM
NOT TO SCALE
SKIMMER SEDIMENT BASIN
DESIGN CRITERIA
DRAINAGE
disturbed areas within 21 calendar days after
AREA
< 10 AC.
(ACRES)
Late winter: February 15 - April 15
MIN.
SEEDING
LENGTH TO
2:1
WIDTH RATIO
15 lbs/acre hulled Bermudagrass
MAX.
imbalance is responsible.
LENGTH TO
6:1
WIDTH RATIO
tall fescue is very effective.
MIN.
1800
VOLUME
(CU. FT.
REQUIRED
PER AC.
lbs/acre limestone and 1000 lbs/acre 10-10-10
DISTURBED)
fertilizer.
325
SURFACE
(SQ. Fr,
AREA
PER CFS
REQUIRED
Q10)
PLAN VIEW
INFLOW
STRUCTUR
PLAN
L
STRUCTURAL STONE SHALL BE CLASS "B"STONE
NOTE: A ---I f
FOR EROSION CONTROL PURPOSES POST
SEDIMENT CONTROL STONE SHALL BE
NO. 57 STONE SILT FENCE SILT FENCE
kWA
HARDWARE
CLOTH
HARDWARE CLOTH BETWEEN POSTS
HARDWARE CLOTH AND SILT FENCE A-
TO BE BURIED MINIMUN OF 1' TOP VIEW
SEDIMENT SILT FENCE POST HARDWARE SILT
CONTROL & POST CLOTH FENCE
STONE LLLLLLLLLL L LLLLLLL
LL
2•J 1 LLLLLLLLLL LLLLLLLLLL
LLLLLLLLLL LLLLLLLLLL
y2 LLLLLLLLLL LLLLLLLLL
1� [MAX LLLLLLLLL LLLLLLLLL
`STRUCTURAL
�1 STONE 18"MIN.
SECTION "A -A" FRONT VIEW
STONE OUTLET DETAIL
STONE OTLETS SHOULD BE PLACED IN THE LOW-LYING AREAS OF SILT FENCING, BASED ON FIELD CONDITIONS
MAINTENANCE: FRESHEN STONE WHEN SEDIMENT ACCUULATION IS 6 INCHES OR AS NEEDED
GENERAL NOTES:
1. RIPRAP SIZE TO BE DESIGNED BY ENGINEER.
2. CHECK DAMS MAY BE USED IN SLOPING DITCHES
OR CHANNELS TO SLOW VELOCITY OR TO CREATE
SEDIMENT TRAPS.
3. ENSURE THAT MAXIMUM SPACING BETWEEN DAMS PLACES THE
TOE OF THE UPSTREAM DAM AT THE SAME ELEVATION AS THE
DOWNSTREAM DAM (SEE DIAGRAM BELOW).
CLASS B RIP
i
III_I=111_gl:5ll-qlq� MAXIMUM SPACING _ B
- -=III_III_III_III=111=III= = I_
III=111=111_111_ 111_111_
A AND B ARE AT EQUAL ELEVATIONS CROSS SECTION
TEMPORARY ROCK CHECK DAM
l'-6" MIN.
-ONE
Maintenance Inspect baffles at least once aweek and after each rainfall. Make any required
repairs immediately.
Be sure to maintain access to the baffles. Should the fabric of a baffle collapse,
tear, decompose, or become ineffective, replace it promptly.
Remove sediment deposits when it reaches half full, to provide adequate
storage volume for the next rain and to reduce pressure on the baffles.
Take care to avoid damaging the baffles during cleanout, and replace if damaged
during cleanout operations. Sediment depth should never exceed half the
designed storage depth.
After the contributing drainage area has been properly stabilized, remove all
baffle materials and unstable sediment deposits, bring the area to grade, and
stabilize it.
�Y_taY •���
1'1'1'1'1
AVERAGE_ AREA*
WIDTH LENGTH
* AREA OF BASIN WATER
SURFACE AT TOP OF PRIMARY
SPILLWAY
CROSS-SECTION VIEW
INFLOW
DEWATERII
Z0�
FILTER Fi
BANKMENT
S
NOTES:
1. REFER TO
NCESCPDM SECTION
#6.64 FOR
ADDITIONAL DESIGN
SPECIFICATIONS
REGARDING SKIMMER
SEDIMENT BASINS.
DATA BLOCK NOT TO SCALE
BASIN DRAINAGE DENUDED BASIN VOLUME BASIN SURFACE AREA CLEANOUT H Z L T W SKIMMER SKIMMER
AREA AREA Qto REQUIRED PROVIDED REQUIRED PROVIDED DEPTH (FT.) (FEET) (FEET) (FEET) (FEET) (FEET) PIPE ORIFICE
(ACRES) (ACRES) (CUBIC Fr.) (CUBIC FT.) (SQ Fr.) (SQ Fi.) H/2 DIAMETER DIAMETER
BMP2 15.415.4 1�5�2�71473 17583 32530 2.5 5 5 VARIES NA NA 6" 3"17583 32530 2.5 5 5 VARIES NA NA 6„ 3"
SKIMMER SEDIMENT BASIN
GENTLE SLOPES STEEP SLOPES
SEEDING
MIXTURE
80 lbs/acre of tall fesue
100 lbs/acre tall fescue
30 lbs/acre Sericea lespedeza
(unscarified after August 15)
10 lbs/acre Kobe lespedeza
disturbed areas within 21 calendar days after
FALL: August 25 - October
FALL: August 25 - October 15
SEEDING
Late winter: February 15 - April 15
Late winter: February 15 - April 15
SEEDING
To extend spring seeding into June, add
To extend spring seeding into June, add
DATES
15 lbs/acre hulled Bermudagrass
15 lbs/acre hulled Bermudagrass
imbalance is responsible.
Overseeding of Kobe lespedeza over fall -seeded
Overseeding of Kobe lespedeza over fall -seeded
same season, if possible.
tall fescue is very effective.
tall fescue is very effective.
SEEDING
Apply lime and fertilizer per soil tests, or 4000
Apply lime and fertilizer per soil tests, or 4000
AMENDMENTS
lbs/acre limestone and 1000 lbs/acre 10-10-10
lbs/acre limestone and 1000 lbs/acre 10-10-10
through 6.11 v).
fertilizer.
fertilizer.
NOTE 1
40 lbs/acre of German millet
80 lbs/acre of tall fesue
Ground Cover-- Protective cover must be established on all
disturbed areas within 21 calendar days after
land disturbing activity is completed or has temporarily ceased.
NOTE 2
SEEDING
Graded slopes and fills --Protective cover must be established on all graded slopes and fills within 21 calendar days after
a phase of grading is completed
or has temporarily ceased.
SEEDING
SCHEDULE
Maintenance Generally, a stand of vegetation cannot be determined to be fully established
If vegetation fails to grow, soil must be tested to determine ifacidity or nutrient
until soil cover has been maintained for one full year from planting. Inspect
imbalance is responsible.
seeded areas for failure and make necessary repairs and reseedings within the
hydroseeding.
same season, if possible.
Fertilization -On the typical disturbed site, full establishment usually
Reseeding -If a stand has inadequate cover, re-evaluate choice of plant
requires refeslili cat on in the second growing season, Fine turf requires
materials and quantities of lime and fertilizer. Re-establish Lhe stand after
annual maintenance fertilization (Table 6.126). Use soil tests if possible or
seedbed preparation or over -seed the stand. consider seeding temporary,
follow the guidelines given for the specific seeding mixture. (Tables 6.l 1c
annual species if the time of year is not appropriate for permanent seeding
through 6.11 v).
(Practice 6. 10, Tenmporaty Seeding).
�
Maintenance: Check sedimentbasin safter eachrainfall.Remove sediment andrestore original
volume when sediment accumulates to about one-half the design volume.
Sediment should be placed above the basin and adequately stabilized.
Check the structure for erosion, piping, and rock displacement weekly and
after each significant (1,h inch or greater) rainstorm and repair immediately.
Remove the structure and any unstable sediment immediately after the
construction site has been permanently stabilized. Smooth the basin site to
blend with the surrounding area and stabilize. All water and sediment should
be removed from the basin prior to dam removal. Sediment should be placed
in designated disposal areas and not allowed to flow into streams or drainage
ways during structure removal.
Maintenance Inspect skimmer sediment basins at least weekly and after each significant
(one-half inch or greater) rainfall event and repair immediately. Remove
sediment and restore the basin to its original dimensions when sediment
accumulates to one-half the height of the first baffle. Pull the skimmer to
one side so that the sediment undemeath it can be excavated. Excavate the
sediment from the entire basin, not just around the skimmer or the first cell.
Make sure vegetation growing in the bottom of the basin does not hold down
the skimmer.
Repair the baffles if they are damaged. Re -anchor the baffles if water is
flowing underneath or around them.
If the skimmer isclogged with trash and there is water in the basin, usually
jerking on the rope will make the skimmer bob up and down and dislodge
the debris and restore flow. If this does not work, pull the skimmer over to
the side of the basin and remove the debris. Also check the orifice inside the
skimmer to see if it is clogged; if so remove the debris.
If the skimmer arm or barrel pipe is clogged, the orifiee can be removed and
the obstruction cleared with a plumber's snake or by flushing with water. Be
sure and replace the orifice before repositioning the skimmer.
Check the fabric lined spillway for damage and make any required repairs
with fabric that spans the full width of the spillway. Check the embankment,
spillways, and outlet for erosion damage, and inspect the embankment for
piping and settlement, Make all necessary repairs immediately. Remove all
trash and other debris from the skimmer and pool areas.
Freezing weather can result in ice forming in the basin. Some special
precautions should be taken in the winter to prevent the skimmer from
plugging with ice.
TEMPORARY SEEDING FOR WARM AND COOL SEASON
EARLY SUMMER SEASON STEEP SLOPES
IAX
NTER
SEEDING
MIXTURE
40 lbs/acre of German millet
80 lbs/acre of tall fesue
120 lbs/acre Rye (grain)
80 lbs/acre tall fesue
n
f
May 1 - August 15
October 25 - December 30
SEEDING
Refertilize if growth is not fully adequate.
Between December 30 - February 15,
DATES
UN
per/
add 50 lbs/acre of annual Kobe lespedeza.
J
Apply 4000 lbs/acre straw or equivalent
Apply 4000 lbs/acre straw or equivalent
V h
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)
Maintenance Reseed and mulch areas where seedling emergence is poor, or where erosion
occurs, as soon as possible. Do nol mow. Protect from traffic as much as
possible.
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C4.1

I I I
I
II
1 i
GENERAL GRADING NOTES
A. THE CONTRACTOR SHALL NOTIFY LOCAL UTILITY COMPANIES AND UTILITY LOCATOR SERVICE PRIOR TO BEGINNING CONSTRUCTION. CONTRACTOR SHALL
MEET W/ OWNER'S MAINTENANCE PERSONNEL AND OTHERS AS NECESSARY TO ASSIST IN LOCATING ALL EXISTING UTILITIES AND BELOW GRADE IMPROVEMENTS
NOT CHARTED BY THE SURVEYOR.
B. THE LOCATION OF EXISTING UTILITIES, STORM DRAINAGE STRUCTURES AND OTHER ABOVE AND BELOW GRADE IMPROVEMENTS ARE APPROXIMATELY AS
SHOWN. IT IS THE CONTRACTOR'S RESPONSIBILITY TO DETERMINE THE EXACT LOCATION, SIZE AND INVERT ELEVATIONS OF SUCH PRIOR TO BEGINNING
CONSTRUCTION.
C. INSTALL TEMPORARY INLET SEDIMENT TRAPS AT ALL EXISTING STORM DRAINAGE STRUCTURES ADJACENT TO OR IMMEDIATELY DOWNSTREAM OF DEMOLITION
AREAS TO PREVENT FLOW OF SEDIMENT AND DEBRIS INTO EXISTING STORM DRAINAGE SYSTEMS.
D. THERE SHALL BE NO TAPS, PIPING BRANCHES, UNAPPROVED BYPASS PIPING, HYDRANTS, FIRE DEPT. CONNECTION POINTS, OR OTHER WATER USING
APPURTENANCES CONNECTED TO THE SUPPLY UNE BETWEEN ANY WATER METER AND IT'S REQUIRED BACKFLOW PREVENTER. E. APPROVAL OF THIS PLAN IS
NOT AN AUTHORIZATION TO GRADE ADJACENT PROPERTIES. WHEN FIELD CONDITIONS WARRANT OFF-SITE GRADING, PERMISSION MUST BE OBTAINED FROM THE
AFFECTED PROPERTY OWNERS.
F. SEE MECH.PLANS FOR LOCATION OF ROOF LEADERS. PIPE SIZE MAY BE REVISED ACCORDING TO DOWNSPOUT LOCATION. CONTACT ENGINEER AS REQUIRED
G. RETAINING WALL DESIGN SHALL BE PREPARED BY A LICENSED NC ENGINEER. RESPONSIBILITY OF THE WALL DESIGN BY ENGINEER AND CONTRACTOR.
PROVIDE SHOP DRAWINGS FOR APPROVAL. WHERE WALL RUNS PARALLEL TO EXISTING 48" RCP THE WALL SHALL BE DESIGNED TO ENSURE STABILITY OF
WALL SHOULD EXCAVATION AND REMOVAL OF 48" RCP BE REQUIRED FOR MAINTENANCE. RETAINING WALL FOOTING SHALL BE DROPPED NEAR 48"RCP TO
MAINTAIN A 1:1 SLOPE FROM "OUTSIDE" EDGE OF THE 48" RCP INVERT TO THE WALL FOOTING.
H. BMP MAINTENANCE AND RESPONSIBILTY CONTACT:
Jon Wilson
Construction Manager
301 South College Street, Suite 2800 / Charlotte, NC 28202
d:704.343.4386 m: 704.941.1418
ion.wilson(a�childressklein.com / childressklein.com
UPSTREAM STR
DOWNSTREAM
STR
DIAMETER
I
LENGTH
FT.
SLOPE
%
DRAINAGE
AREA (AC)
RUNOFF
COE
"C"
INLETNCHES
RUNOFF (Q)
GFS
TOTAL FLOW
CFS
UPSTREAM
INVERT
DOWNSTREAM
INVERT
STR. #
TYPE
STR
ELEV.
COVER
COMMENT
FT.
REVISE STORM AND GRADING
NCDENR COMMENTS
2.28.17
3.23.17
PHASE TASK
FILE NAME
-
PLOT DATE
so
S1
15
68
1.18%
0.58
0.80
3.26
3.26
653.00
652.20
so
CB
657.30
3.05
S1
S2
24
186
0.50%
1.45
0.80
8.15
11.42
652.00
651.07
S1
DI
656.94
2.94
S2
S3
30
194
0.80%
1.56
0.95
10.42
21.84
651.07
649.52
S2
DI
656.70
3.13
S3
S3A
30
111
0.69%
1.63
0.95
10.89
32.72
649.52
648.75
S3
DBL -CB
654.59
2.57
S3A
S4
30
111
1 0.70%
1.22
0.95
8.15
40.88
648.75
647.97
S3A
DBL -CB
654.59
3.34
S4
S4A
36
113
0.60%
1.00
0.95
6.68
39.40
647.97
647.29
S4
DBL -C13
654.36
3.39
S4A
S5
36
113
0.60%
1.07
0.95
7.15
46.55
647.29
646.61
S4A
DBL -C13
655.00
4.71
S5
S6
42
226
0
1.35%
1.36
0.95
9.08
48.48
646.61
643.57
S5
DBL -CB
655.00
4.89
S6
S7
42
108
0
2.38%
0.97
0.95
6.48 1
54.96
643.57
641.00
S6
CB
655.20
8.13
S7
S8
42
22
0
10.00%
0.55
0.90
3.48
58.44
641.00
638.80
S7
CB
653.90
9.40
S8
S9
42
14
1.00%
--
-
-
73.74
616.14
616.00
S8
JB(NOTE 3)
649.00
29.36 CLASS IV O-RING RCP
S9
WALL
616.00
S30
EX.C13
15
32
1.00%
0.09
0.80
0.51
0.51
655.32
655.00
S30
CB
659.50
2.93
0
TCURB0
S20
S21
10
108
1.00%
0.15
0.80
0.84
0.84
649.30
648.22
S20
CB
653.30
3.17
S21
S22
10
14
1 10.00%
0.55
0.90
3.48
4.32
1 647.00
645.60
S21
CB
653.70
5.87
S22
S23
10
20
0.50%
--
-
--
4.32
618.10 1
618.00
S22
JB(NOTE3)
651.00
32.07 CLASS IV O-RING RCP
S23
WALL
620.00
1.AII Structures to be NCDOT Standards. NON-STANDARD BOXES contractor provide shop drawings. All storm drain to be RCP CL -111 unless noted otherwise
2. Charlotte Rainfall Intensities =10yr= 7.03 in/hr, 25yr = 8.21, 50yr = 9.00. Inlet Runoff, Q = (C x I x A)
3.Manhole to be water tight
ALL DROP INLETS TO BE NCDOT 840.46 SEE DTL. SHT.C4.3
//ACTUAL FEMA FRINGE I I I I 1 1 / _ - f
w _-i 630 _---I - % / _/ //
FROM FIELD' RUN o
/ODDL OPO PER LOMR) / / I I \ \ \ , /' --FRED/ N10 T LEY
/ DB 9 67 g0 145 (ZONED R.E.
CABARRUS COUNTY, NUMBER 2 TOWNSHIP, NC
OWNER- CK AFTON RIDGE RETAIL LLC
DEED REFERENCE: BOOK 5578, PAUE 115
TAX PIN: 4691904955
(CONTINUE CONSTRUCTION SEQUENCE)
6. BEGIN RETAINING WALL CONSTUCTION AND STORM DRAIN DIVERTING RUNOFF INTO
PIPES PROVIDE INLET PROTECTION AS STUCTURES ARE BUILT. RE -GRADE BMP TO
FINISH GRADES AS SHOWN ON THIS SHEET SEEDING AND MULCHING WHEN FINISH
GRADES ARE ACHIEVED.
7. ALL SURFACE RUNOFF FROM THE PROPOSED DISTURBED AREAS MUST BE ROUTED
TO AN EROSION CONTROL DEVICE. AS FINISH GRADES ARE ACHIEVED INSTALL
PERMANENT GROUND COVER.
E:�1►��d��K�LL�la�1�_��:L��1►«K�7►��:�:lij1[iL■�:�_L[y�
�■1109106nil 1f�0ld:102i�_<<f:ZKw�
10. UPON APPROVAL FROM INSPECTOR, REMOVE BAFFLES FROM BMP, REMOVE
SKIMMER, AND INSTALL PERMANENT BMP VEGETATION PER PLANTING DETAIL SHEET
C4.1. REMOVE ALL TEMPORARY EROSION CONTROL MEASURES SEED AND MULCH ALL
DISTURBED AREAS
- - E CREEK(YADKIN BASIN) / 1 / - �' __` _ /j \\ / RETAI WALL BY CONTRACTOfF �E�r YPIC -
ESES INC.
TEMP.STONE OUTLETSD �1H-___TYP.SEED TAIL/48 1 J
j i / / / / / / ♦ RIIX` n5 22 .� _ _ ' - _ - - BW: 640 5
VVV - _ .��� / PG.
- - - - �- - - - I - / I / / / � / ��k♦ $ TYPE 3 BUFFER _ ----/ -G= ----------------- -----
I - 7_ - - - - - / I / / / i _ \�\ INV: 61 �N-------------------------------- - - - - - - - - - _ \ ( E HE
-
- - _ __ _ _
I \�� w Vfi} �� _ j� -� - - - - - \ _
SD 48" RCP sD -_tu0 SD, -SD- _sD� ,fi/17.98 x - - = 7r��- - x
Y / ' -- -/- 5[rJ-c =�D _ _ ---------------
// oaf �p SDS=��D---sem -- SD ------s\- _-- ------------- ��V�:632\ f/ X y0 / v �a1•�•
- SD
I�/ // - \ \I co `�:}� N Ma i;� ,•® ,�?k♦`-------------_ ���--- - __==--- --- -- - ! �� �� 652 / / i /
I / I \
- - - -----------
VICINITY MAP (NOT DRAWN TO SCALE)
N1�,o�------- -X =i��-A �X��-=- - - - - - - - - - - - - - - - - - - - - - ------6`J- \�� \ �� \�-----__ -_6.�8 -- ti�S.yU / -
/ X - - - - - - - - -4�~�J
620\y�,' �= - ------t�`------------- - StcE�E�AI� ----- --- _ _ � _���_ - -_-_ --_ _-- ---- I- /
I i IBED RSOD BUFFE i / / / / II IIII/ '� �\�` I \ 1 ,��'/ /// ------ - -------- x����..._�__- _ _ --- --- --�-- - ---_-_ h __ °-- \ \ 659 -----� _o __
I 182'UNDISTUNUW_ 4.15.2.2) I / IIII 'rI I I i 1 \ \ \ II J I /�'�/ �' _ - _-- ------ �-x X-�c 7�=�t -X -x650- _ -
1 �REF.W ULATION: i I / / / it I I i \ \I 1 ) I,y'i / /,�' / ' ------0 -------- --
I calc 98)/250=8%I / / I Illlp i 1 °' \I\� / ,I I /, �/ / ------ _ ------ ------ - - _--=____-----_- -_-_- --_
SLOWIDTM 5' (4x8)=82 i I / // / II II -I i i i II No lil ��f/ l� l // /// Sfi- �_-55-+�0- - _ �o --- ------ ---- - - f h^ ���� \ I NV: 654116 1
't I
I A --------------- --- \ \I \
� � - I 1
NO W)) ruk I A4LOWED ` I I 1 I Cr) a� I , / 2 h - - - _ c _ - - - 6
I IN 4 F[ �VAYIORITHE FEMA FLOOD f + II \ I n� 0) �1�� I /,/' / ---_ ',___i ---- ------ ) 66 rob \ \\
FRINGE 1 Ih \' \ I`\ I o' U / /� // � 6 _---- ---_ 656 / \ �//^\ \ \ h^ �j
17 11 Do
760 SF
I I I I I I II I 12 / \-- / \\
4260 F
--_-_
II 1 I SSMH' I I I 1 \ i \ \ \ 1 �` �/ // 657 65, / X ,-
RIM: 605.31 I I I , EX.SDMFiI I \ \q f\I ? ,� , ,-- ---- I / / // / / 5 .5 \ \ / / 52/ 66j�1 \
III / I I RIM: 624.23 I , , I / / / \
I , � INV: 589.36(IN) I I INV: 612.53(IN)I \ I I , I ' ,' / �' '/
/ `./ INLET PROTECTION, TYP."`\•I I
IINV: 589.36(OUT) I I I I,k i' ,EX.INV•61 4 I / / / / / - \\ / / SEE DTL. SHT.C4.1
o 0 0 0 0 0 0 0 0
INV: 609.23(OUT) I I \\ I �/ I 1 I , , I / / / / / / / �o _ / �. \\ 0 / 4s / / P• \L / v\_ Lv
II II h h h / h )
,, 1 Uj /
IEX! utlet Structure / I I' 1
1 i Too 61 .33 I PR P.E ; 617.2 I I �'� 1 0
1 UjY
\ 1 f v.l In (3;' Orifice) 616.16 I \ E V':I 10.91 0 11 y �/, o- ; � � I TWJ6°4� / ��
1 I I\ 1 II P.E14616.8 ,f 613 �, BW: 6260
1 IAv. 'Onut 161"3.28 Gate) 613.61 \ I X.INV: 910.6 J I 11 " ' \ 1 200 SF ^^q III
6I 1�'I I' I \ \ 0 / POP.I
j 1 i 1 I 1 I 1 36"CPP ' T
INV: 60s. �\ 5 I li I I I �t�yl I I I 1 1 20 UBLIC
10 lr �o I I / I I I L�L ESM T. I \ \ \
►/ / I 1I\\ J \ \\ CONC.HW �1 I I I 1 \\ III I � I I I I I I 1 L--- --------- --------- --------- �------------------ T ---------- ----\ ---- -- - - - - - - T --------- --,�
TOP=
76 I PROVIDE I \ \ I I
I
\, INV: 6QJ. 1 1 1 1 ,I 1 2' OF COV \\ \" I I I I I II I I I I I I I�
II 1 o I , \ �� �'I U� 11 ON EX.RCP
,I / I WD qI �` � I� I o I � I � I I I I I I ��I I I I I I I I I I
�' I I i � I \ �\\ I,f I I C ESI I I x- x
►II NNi \, I IIII IEMT.
M DOUBLE ROW HIGH I I I I I I
m�1 HAZARD SILT FENCE IIS IIII I I I , , I I I I I I I I I I I
-u; I ALONG CREEK SIDE
0 m l I I I 1
w 1 \ y 1 SEE DETAIL I '1 I 612 I 1 I I RETAIN
I A L B I ro \ I
1
1 M 1 I I I 13,125 SF LO (TR To �SE NOTE �G, I I 880 I 2.6
LU I� I \ �„ � � I <' � II � I 1
' I i I K o m i i� I I I/ I 1 \ )11 1 YPICA . ICOD C MPLIA T I I I 1
o I i / �I j 1 1� III 1 I Iv/ I I i /� I i f /� ENCE; AIiOgGI T OF AL I I
\ \ I
100
1 1 1 1 1 1 1 1 III I I \ I \ \
`�
I N I I / I II I SII I I
21,590 SF
N e�
TW: 4 I I I I I I I` I I 1 1 I I 1 \
I 1 I I I I 11 BW: 624IIII I I \ \ \ \
CO \
\ \
2.6
/ iI I II I II,�I I I I I I 111 I I I I I I
1 I I �( IIII 11 l i 1 1 11 1 I I I I III I 1 `\ \\ �
\
J 1I I 1 \ \
I< i I 11 I II II 11 (
PROP.BMP2 I Y I 11 TEMP.lA FL�ES 4. I E RETAI I \
NORMAL POOL I I � IIII s�11f. �4. 1 1 1 rn I e I \\ �-
I1 I I IIIII I I 11 SEE DTLS.SHT: I I I I �I I I I I I I 00 1 I I e� I \ \
I ' I
04.1
I i NOTE:ONCE ALL STORM II I� I I I I
N ; DRAIN AND PERMANENT I 11 ICNI
I 11 I i i I III I1 I T U I I 1 1 1 1 I I 1 I I r
1 1 GROUND COVER IS INSTALLED`] i� I I I cV I (�I I 6'LITTORAL I I I I I I I I I I I I I 1 1 1 1 I 1 \
I I AND ESTABLISHED THE BMP ) z co I M
I I I SHELF I I I I 1 1 I I �\ I � EEE - 6 6 2.6
SHALL HAVE SEDIMENT I I I I I I I I I I I I I I I I I I I I \
\ 1 I REMOVED AND FINAL GRADES I ! I I I 33 1 I I 1'
I N I I SHALL D ACHIEVED TO THE '1 I I I I' I I I 1 I I I I I I I &61, NOTE: MINIMUM FIFE = 614.80
I/ ) I I I I 1 IELEVATION = 613.6(NAVD 88) +2 = i
\ 1 / ELEVATIONS AND ASSOCIATED ISI I I I // III I I I I I I I I I I I I I( �' I 615.6-0.8=614.8(NGVD 29) NOTE:0.8 = NGVD \ \
AREAS SHOWN ON THIS 1 1 1 1 1 I I I x x I I IIII I I I I I I I I „'
29/NGVD 88 CONVERSION PER FIRM MAP 3710469100)
I SHEET AND ,SHT.C4.1. ALL ,� I I EFFECTIVE DATE NOVEMBER 5, 2008 -
\\ i I DISTURBED AREAS ARE TO I+I I IN ' N I I 1 I I I I I I I I I o I I I I \
I I \ I I BE SEEDEDI AND MAINTAINED I I' a 11 l>J I I 1
AS NOTED 'ON THE DETAILS I II I I I� ( I I I I I I I I I ` I I! "'
FOUND ON SHEET C4.1 AND I to I N V' 1 1 III 1 I ci I I I I I Iti'
li j I C ALL PLANTINGS ARE TO BE/ I I� I I ICL +
I INSTALLED AND MAwrAINb I I w ' IIIII I I 1 I I I I I 1 I I I II I I I I I \ I I
y I I 1 1 0 1 a 1� I I I i t IV CO 0 ry � 0 / ro
AS NOTED. / I �I II I 3"1
I � I. � - - -- - � � �;�' 0,• ti• X . �,�-0 � � • � • - � �,�
1 \ I I I I I I I I ol1 m `�' I I T 645 , I\ 1 1 1 $65 ti' m 0 ti ti' �� X m ti o X-
1 1 \ i I 1 II�11 1 I i 1 1 1 1 I 1 1 1 ti r ti ti ti ti ti 1
� I '7�
�.'
T
1 I I 1 I. I I I I 1 I II I I \ \-------- ----
I -- ,-- ss1
:645 \ I\ 1 •o
1 If i I 1 1 I I 1 I 1 pyo I I I 1 I 1 \ \ 6, �, rna, Sec 661
S21 \ ( I 1 \ \ `C� o, 0 661 ti� e 661 0� 66
m I I 1 I i I 46 . 61 p 0 O
I' i I I I I �� I I I ► \ \ 6 `o
CONCRETE WASHOUT
SEE DTL.SHT.C4.1 I
�� 660 �h ary s
661 0 6 s V 659 9
i ONC.FES ..., / I 656 \ 6°` o• o• •� 60-64, o!ti o• o o• 660 9 w�
- - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - -
� i � 1 N � I I \ \ 1 1 ��� I I III v= 1 50 � �,,• � �s - - - 6, '
a. ------- - - - - - - - - - - - - - - �-INL-ET�RIITE�TIbN, 3'CURS CUf/FLl7FiE 1 CURt3 CUT
613 � i� /' \�/ / I I __------ 3'CURB CUT/FLUME 50
I SSM h I 1 1 I I 1 2042 SF- / \i �\ \ 58 / 0 \ SEE DTL. SHT.C4.1 �� 6"HI H WRAP AROUND GRATE TYP
\ I -�d 6"HIGH WRAP AROUND GRATE 6
I \
_ a GR: 654.86---- --F X y^+ I� I x X //
11 I GR: 659.91 X RFM. /
\ \ \IIIII co 1 \ \ LET PROTECTION, TYP. i CB - 'A 6 EXIS
\ I \ \ - � x- x- x- X- x-� � / 6 \ x� r-�,il,-CCB LOWER TO 658.0) g0 X x--� x- x- x /
R I I�1 \ 6,0 5.0 �\ \�\ \ I 1 \ 111 1 1 4000 `,�� \ _ s5 st.c4. ` --/ �U I (RAISE: 65� _ _ X TEMP.SILT FENCE, , \ x I T x 'A L❑
I INV. 650.86(OUT) _ ZL'lC _ SEE DETAIL S30 x x - x x r- x - x - X - � x x IN 5 \00(IN Ns \ \ 01 1 I 1 ,/// >y/ / \ , =�__ s�o\ -_ x�x_ .�-�.X=--X--_�=�__- _----- ----- - ----- ---- - -_ \- -- - _ --- ° IE�d---- - ---- -----= ==-- - ----- - -'T _---
- _ -
N V ' S 8 O U \\ \ \\\ \ I I 1 1 , ° / 1 / \\/° \ / \ '- / - / _ _ M - - - -1 - - - - - - - - - - - - M - - - - - - - - - „ - -- - - - - - - - - - - - - - - - - - �,, - - - - - - - M - - - - - - - - MY - - - - - - - - - - - - - - - - -
T --_ ---- -- - - __
- _ - _ --
\ I� I I '+.WATE,PtII HT/ /\ \\/ `°� _ \ LP n SSMH n 659 -60 n 16"WM - -
\RIM -63 / 0 1"n� _��_ -=�6+� --- __ - " - -- - - _- -_ --- -
I I I
I I 0
I I
I I I
I I
I
I i
I
I
I
z
FA
�1 I
i --
II
I
I
SE
IV
I
I 11'
II
/ I i INLET PR
I EE DTL.
I
\ s V.IDd= 26 1 o N ` --- z- -----::--:--- - _------_----_-: --- -- - ----_--._----_-----
/ - -
CB B GR: 661.64
\ 1 / / \ ® \\/ _ 16iM � ---- --�� -- / _-----------------_-.._-- Og------ CB ----------- C -g - �y�
•� o w ' - --- -� _ - - INV: 645:H-61;TN)
- No Gfa�: 655.64 _ _ GLEN AFTON BLVD. GR: 660.23 GR: 660.96 oc +
\ \ \ I OU -6 7. 5 \ rn %t ��9 a GR: 658.95 0� IN 657.95(OUT): 66
I \ -` / ° d N _ S =s - d, GR 65.56 0 INVy645.04(OUT) o GR: 658.07 INV: 650.88 IN -661 n INV: 657.05(OUT)-
I 62 y` / s INV: 650.08(IN) / " INV: 654.24(OUT) INV: 654.83(OUT)VARIABLE WIDTH PUBLIC R/W ! D ( ) _ -
i' j �`� -SS SS SS �S �� SS SS SS $ PVGSS- SS SSS -SS -ss -ss -SS -ss -SS' S SS IV: 650.85WUT SS�SS��C SS SS-�a SS -SS -Ss -SS -RP -SS a SS_SS_
INV: 60.04(OUT mss
10-0-
, , '� CB. ss� \ RIM: 660.53 MH n CB a
\ 1 \ ,/. l ;�.- ' 1 8" PVC ss_�ss ` X58 INV: 647.92(IN) GR: 660.23
INV: 649.05 OUT 18" RCP 60" RCP I 60" RCP INV: 647.58 _OUT INV: 650.01 (IN)(N) 54" RCP "
1 l / ( ) 54 RCP
T \'FEM FR) / `/ ' \ - - - - - - - - -(�) ( )( )
��N FICO �[ N / / / � / � � � ss � B r.� - �� sD sD sD -- w = - - � _ - �D= � = � = = a � = =-•�= _ `` - � - - - - - - � �.
ELD / / ���� `ss ss -_ ----ate_ ���- -- - - -�� _���_�����_-�� --��sD sINV: b49.g ��=�s� --sem- == = __ �= sem-- -- - \
PO PER sc� _ - _ s /� CB ----- ICV \ ��sD_
I \\ ss \ i �/ RIM: E�0.75 - GR:�5551------- \ - a- - - - - - - - - - - - -- °---------- `---------- a CB
/ _ _ _ CB J \ - IPiVc 649.70( S) I C
CREEK(YADKIN BA r� \ - - - /- - - - - - - - - ---- �� fNV: 649.51O17T�_ - - --SR-6frfi�0- - - - \�V
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_ I I� I _ - - - INV: 651.87 IN)(,NE)
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I INV: 647.22(IN)(W) I� I INV: 650.73(OUT)
INV:651.62(OUT) p \
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I � �I / \ INV: 628.20(IN) I _ __---- I I - - - - - -Cs
INV: 628.17(OUT)� B
GR: 662.71
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/ �lriIINV: 652.61(OUT)
\\�U,�'\\\/\ ' 1 ' EROSION CONTROL SEQUENCE(GRADING AND DRAINAGE) (VERIFIED)
\ \ I \ \ " /
I I 1 \ \\ I \ \ \►\ \ \ / +j / , ,� I I 1. AS AS AREAS ARE BROUGHT TO GRADE ADJUST AND MAINTAIN TEMP.SILT CB '
\\� \ \ ;,0" GR: 662.85
// , ` I I DITCHES TO ALWAYS DRAIN TO EXISTING SLOPE DRAINS. WHEN DRY PERIODS l
63 \ \ % a/� i i I I INV: 652.56(IN)
/ ' ' I o I ARE ALLOW, MODIFY BMP2 TO NEED FINISH GRADES AS SHOWN THIS (VERIFIED)
SHEET, AND PROVIDE PERM. SEEDING.
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INIX: r@U �5 / i' Q / I I I c
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\ oq PROVIDE PERMANENT GROUND COVER AS SOON AS FINISH GRADES ARE MET.
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CB
3. MAINTAIN EROSION CONTROL DEVICES AS NEEDED AND SPECIFIED ON SHEET C4.1 I
0) h �\ ♦ GR: 35.39 i �� I 1 4. STABILIZE SITE AS AREAS ARE BROUGHT TO FINISHED GRADE.
629.00 OUT ,'� i by SS H I N "
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RR)141: 641.67 1 1 I
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GEQSCIENCE
GROUP
Incorporated
500-K Clanton Road
Charlotte, NC 28217
Phone: [phone]
Fax: [phone]
www.geosciencegroup.com
NC FIRM LICENSE: F-0585(ENG)
NC FIRM LICENSE: C-279(LA)
i
PROJECT MANAGER
-
DRAWING SCALE
-
REV.
DATE
1 NCDENR
21416
PROJECT DATE
-
DESIGN -BY
2
REVISE BMP, RETN.WALLS AND STORM DRAINAGE
REVISE STORM AND GRADING
1.26.17
2.6.17
PROJECT NUMBER
CH16.0088.CV
APPROVED BY
-
4
REVISE STORM AND GRADING
NCDENR COMMENTS
2.28.17
3.23.17
PHASE TASK
FILE NAME
-
PLOT DATE
,.�
10725 _
AFTON RIDGE II -BUILDING 1
KANNAPOLIS, NORTH CAROLINA
CHILDRESS KLEIN PROPERTIES
PHASE II, GRADING DRAINAGE
AND EROSION CONTROL PLAN
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GR. 66.14 1
654.55(kT)
0 C N, TYP. _F 114
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INV: 650.*1N) - o
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ill S I�C�IN I �I I INV: 652.90(OUT)
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ill I III III INV: 653.04(IN)
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C2.2

Permit Number:
(to be provided by DWQ)
Drainage Area Number:
Wet Detention Basin Operation and Maintenance Agreement
I will keep a maintenance record on this BMP. This maintenance record will be kept in a
log in a known set location. Any deficient BMP elements noted in the inspection will be
corrected, repaired or replaced immediately. These deficiencies can affect the integrity
of structures, safety of the public, and the removal efficiency of the BMP.
The wet detention basin system is defined as the wet detention basin,
pretreatment including forebays and the vegetated filter if one is provided.
This system (check one):
❑ does ® does not incorporate a vegetated filter at the outlet.
This system (check one):
❑ does ® does not incorporate pretreatment other than a forebay.
Important maintenance procedures:
- Immediately after the wet detention basin is established, the plants on the
vegetated shelf and perimeter of the basin should be watered twice weekly if
needed, until the plants become established (commonly six weeks).
- No portion of the wet detention pond should be fertilized after the first initial
fertilization that is required to establish the plants on the vegetated shelf.
- Stable groundcover should be maintained in the drainage area to reduce the
sediment load to the wet detention basin.
- If the basin must be drained for an emergency or to perform maintenance, the
flushing of sediment through the emergency drain should be minimized to the
maximum extent practical.
- Once a year, a dam safety expert should inspect the embankment.
After the wet detention pond is established, it should be inspected once a month and
within 24 hours after every storm event greater than 1.0 inches (or 1.5 inches if in a
Coastal County). Records of operation and maintenance should be kept in a known set
location and must be available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element:
Potentialproblem:
How I will remediate theproblem:
The entire BMP
Trash/debris is present.
Remove the trash/ debris.
The perimeter of the wet
Areas of bare soil and/or
Regrade the soil if necessary to
detention basin
erosive gullies have formed.
remove the gully, and then plant a
ground cover and water until it is
established. Provide lime and a
one-time fertilizer application.
Vegetation is too short or too
Maintain vegetation at a height of
long.
approximately six inches.
Form SW401-Wet Detention Basin O&M-Rev.4 Page 1 of 4

Permit Number:
(to be provided by DWQ)
Drainage Area Number:
BMP element:
Potentialproblem:
How I will remediate theproblem:
The inlet device: pipe or
The pipe is clogged.
Unclog the pipe. Dispose of the
swale
sediment off-site.
The pipe is cracked or
Replace the pipe.
otherwise damaged.
Erosion is occurring in the
Regrade the swale if necessary to
swale.
smooth it over and provide erosion
control devices such as reinforced
turf matting or riprap to avoid
future problems with erosion.
The forebay
Sediment has accumulated to
Search for the source of the
a depth greater than the
sediment and remedy the problem if
original design depth for
possible. Remove the sediment and
sediment storage.
dispose of it in a location where it
will not cause impacts to streams or
the BMP.
Erosion has occurred.
Provide additional erosion
protection such as reinforced turf
matting or riprap if needed to
prevent future erosion problems.
Weeds are present.
Remove the weeds, preferably by
hand. If pesticide is used, wipe it on
the plants rather than s ra in .
The vegetated shelf
Best professional practices
Prune according to best professional
show that pruning is needed
practices
to maintain optimal plant
health.
Plants are dead, diseased or
Determine the source of the
dying.
problem: soils, hydrology, disease,
etc. Remedy the problem and
replace plants. Provide a one-time
fertilizer application to establish the
ground cover if a soil test indicates
it is necessary.
Weeds are present.
Remove the weeds, preferably by
hand. If pesticide is used, wipe it on
the plants rather than spraying.
The main treatment area
Sediment has accumulated to
Search for the source of the
a depth greater than the
sediment and remedy the problem if
original design sediment
possible. Remove the sediment and
storage depth.
dispose of it in a location where it
will not cause impacts to streams or
the BMP.
Algal growth covers over
Consult a professional to remove
50% of the area.
and control the algal growth.
Cattails, phragmites or other
Remove the plants by wiping them
invasive plants cover 50% of
with pesticide (do not spray).
the basin surface.
Form SW401-Wet Detention Basin O&M-Rev.4 Page 2 of 4

Permit Number:
(to be provided by DWQ)
Drainage Area Number:
BMP element:
Potentialproblem:
How I will remediate theproblem:
The embankment
Shrubs have started to grow
Remove shrubs immediately.
on the embankment.
Evidence of muskrat or
Use traps to remove muskrats and
beaver activity is present.
consult a professional to remove
beavers.
A tree has started to grow on
Consult a dam safety specialist to
the embankment.
remove the tree.
An annual inspection by an
Make all needed repairs.
appropriate professional
shows that the embankment
needs repair. if applicable)
The outlet device
Clogging has occurred.
Clean out the outlet device. Dispose
of the sediment off-site.
The outlet device is damaged
Repair or replace the outlet device.
The receiving water
Erosion or other signs of
Contact the local NC Division of
damage have occurred at the
Water Quality Regional Office, or
outlet.
the 401 Oversight Unit at 919-733-
1786.
The measuring device used to determine the sediment elevation shall be such
that it will give an accurate depth reading and not readily penetrate into
accumulated sediments.
When the permanent pool depth reads 4.5 feet in the main pond, the sediment
shall be removed.
When the permanent pool depth reads 3.5 feet in the forebay, the sediment
shall be removed.
BASIN DIAGRAM
ill in the blanks)
0 Permanent Pool Elevation 617.50
Sediment Removal . 614 APeanen Pool----------- -ume Sediment Removal Elevation 613 Volume
BottomElevatio 613 in.---------------------------------------------Wr
ement Bottom Elevation 612 1 -ft
Storage Sedimei
Storage
FOREBAY MAIN POND
Form SW401-Wet Detention Basin O&M-Rev.4 Page 3 of 4

Permit Number:
(to be provided by DWQ)
I acknowledge and agree by my signature below that I am responsible for the
performance of the maintenance procedures listed above. I agree to notify DWQ of any
problems with the system or prior to any changes to the system or responsible party.
Project name:Afton Ridge II, Bui
BMP drainage area number:BMP #2
Print name:
Title: _Rr4n+r
A
Address:301 South College Street, Suite 2800, Charlotte, NC 28202
Phon
Sign,
Date
Note: The legally responsible party should not be a homeowners association unless more than 50% of
the lots have been sold and a resident of the subdivision has been named the president.
I, A. n , a Notary Public for the State of
County of P_C (C�e�( , do hereby certify that
personally appeared before me this 23 ~-
day of (Y1C� rc� , �2D,7 , and acknowledge the due execution of the
forgoing wet detention basin maintenance requirements. Witness my hand and official
seal,
S
MY COM Erp.
"�11
rrrrrn1111u+a►►0
SEAL
My commission expires
L41 D-)lacaC7
Form SW401-Wet Detention Basin O&M-Rev.4 Page 4 of 4