SW3190704_7 Exhibit #6 - Sand Filter Table and Revised Plans_1/28/2020

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PROPOSEDGAWND J
ELEVATION ow.)
PROP. SEDIMENTATION CHAMBER /
AREA=371
BOTTOM ELEV,
=666.00 /
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RIPRAPBERMSEPARATIN R RAP P.) Al / / bh
SEDIMENTATION CHAMBER /
FROM SAND FILT4R
TOeFLEV=666.A0 % /
\ _ *f ,.6� SEDIMENTATICI
/ — — — CHAMBER
STADIUM SANDFILTEt
BASIN WITH AWASH$Aqb
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BMP EASEMENT
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PROVIDEHIGNDL-N13DBN
STO12 LATER FNCDATNIN UNDERDDUATHNAlteC 24'iE5
IE'IAYEROFNCOOTRST VIUPPEO VAIH FILTER FABNC POlYFi11YLENEUNER (OflEQUAt1 INSTALL ORMAI TRASH TEN RACK WITH
IN.B67R0
STOREPAIR' 4•TRICKCOVER HINGES FOR MAINTENANCE ACCESS,
UNUNDERORAIFI PIPES) ME UNDERDRAN SYSTEM BRAD. BE EQUIPPED WITH 6' FAIN. PERFORATED SCHEDULE40, OR RACKTO HAVE ISOPENINGS BETWEEN
STRO.HG[ARVCPIPEOR ODUBLEWALL HOPE PIPE. PERFORMONSSHAMBEPERAASHTOM378 BARS (RUST RESISTANT MATERIALS)
FORFVC PIFE,AASHTO MIST FOR DOURLE WALLHOPEPIPE, OR BE3/B' DIAMETERSPACEO 3' STRUCTURE TOP
SAND FILTER CROSS SECTION ONCMURAWNG4LONGRUDINALROWSTHATARESPACEDSO-APAAT.UEPPESSMUHAW ELEV. 670.20
AMLYIMUM StDPEOFO.S%AND A t,—MUh1 SPAONGOF IO RUON CENTER. t 4' X 4' PRECAST
SCALE: 1•=10' 3" ORIFICE BLEEDER CONCRETE RISER
INV, = 667.70 ORIFICE STRUCTURE PER
TURNED DOWN NCDOT STD. 840.31
/
GROUND ELEV. AT
CON�666.O�O
—TOP V. FILTERELEV.666.00III;•; --
( 111-1 I h I=n —11 I �—I I
1-38 / J y A10-CB / >/ f/ / / / - _ - a. 6" PVC UNDER
DRAIN PIPE 24° O-RING RCP FLOW--
INV=662.50 @0.5%
2 / / FLOW— INV=662.47
PROVIDER 6"UP AT ,
THE BOTTOM SLAB SIDE VIEW
f STRUCTURE TOP
ELEV. 670.20
/
3" ORIFICE BLEEDER
STEPS PER NCDOT
INV. =667.70 ORIFICE p STD. 840.66
II f�II1 I I
6" UNDERPVC DRA NPIPE
r
INV=662.50
RCP 24" O-RING RCP /
INV=662.47
/ FRONT VIEW °.
/XS'-4'COMROLS CTU / /
)ETAIIPHISSHE / / / CONTROL STRUCTURE DETAIL
/ CAP 6ttEANPDT(TYP.I / / / / / / / / NOTTOSCALE.
/ /
PONDJNOA CONSTRUCTION SEQUENCE MAINTENANCE SCHEDULE
k PO%NH400. 1 WILL BE USED ASA EROSION CONTROL SEDW ENT BASIN DURING THE CONSTRUCTION PHASE 1. AFTER EVERY SIGNIFICANT RUNOFF PRODUCING RAINFALL WENT AND ATLEASTMONTHLY:
DjH
DECOIMPIETEI:RTO ACCEPTANCE Of THE SAND FILTER FOR OPERATION THE FOLLOWING ITEMS
/ �.� • / / / / / A INSPECTWESYSTEM FOR SEDIMENT ACCUMULATION, EROSI011,71IASHACNMULAVON,
A THE POND MUST BE CLEANED OFALL SEDIMENTS ACCUMULATED DURING CONMUCTION. VEGETATED COVER, AND GENERAL ANY OBSTR
B. THECONTROLSTUCTURE SHALL BE INSTALLED PER THE DESIGN, B. CHECKANDCLEARO ORIFICE Of THIN2TO S DAYS AS ESI THAT THE ORAV/00VI1 OF
C.
ALL VEGETATIVE PLANTINGS SIULL BF,ESTABUSHED. 7NE TEMPORARY POOL OCCURS WITHIN 2T090AYS AS DESIGNED.
2. REPAIR ERODEOAREAS IMMEDIATELY.RE-SEEOTHEEMBANKMENTASNECESSARYTO MAINTAUTG00D
5 VEGETATIVE COVIP, MOW VEGETATIVE COVER ON EMBANKMENT TO MAINTAIN MAXIMUM HEIGHT
OF SIX INCHES, REMOVETRASH AS NEEDED.
3, INSPECTAND REPAIRTHE COLLECTIONSYSTEM II., CATCH BASINS,PIPING,SWALES, RIMAP, ETC.)
h%BfAA.'1J pp / / BMP NOTE:
DRAINAGEAREA MUST BE SfAOiIlZED BEfORE QUARTERLYTO MAINTAIN PROPER FUNCTIONING.
"ry / / / / / / / �'• 4. REMOVE WOODYVEGETATION NOT PARTOF THE APPROVED PLAN ALONG THE DAM EMBANKMENT.
/ FILTRATION CONTROLS AND FILTER MEDIA ARE 5. INSPECT FOR CLOGGING -RAKE DEBRIS SCREEN AND FIRSTINCH OF SAND.
INSTALLED.
1 / / 6. REMOVE SEDIMENT FROM FOREOAY/CHAMBER WHEN MORE THAN I FOOT OF STORAGE IS LOST.
SEDIMENT,TOPSOIL, AND 3INCHES OF FILTER MATERIALMUST BE REMOVED ARM THE ALLOWABLE
DRAWDOWN TIME IS EXCEEDED BY 25 PERCENT.
8. ENTIRE FILTER MATERIAL AND UNDERDRAIN SYSTEM MUST BE REPLACED IF REMOVAL OF 3 INCHES OF
/ / / / / / / \•.,\ MEDIA DOES NOT RESTORE FILTRATION RATE.
E ERO l� ION55TEM SHALL BE EQUIPPED WITH 6° 9. PERFORM ANNUAL INSPECTION OF THE SAND FILTER (ANNUAL INSPECTION REPORTS TO BE KEPT BY
RF INCTED E&IONSDULE ,0RSTRH LLBER, PVC IPEDWITH OR 6" THEOWNER). PRIOR TO INSPECTION NOTIFICATION MUST BE GIVEN TO STORM WATER SERVICES.
PIPE. /P,E�RFORAJ PIS SHALL BE PER AASHTO M278 FOR PVC
P E, HTOM252 FOR DOUOLE WALL HOPE PIPE, ORBE3/8°IN
IA ERSPj�CE03"0�l CENTERALONG 4 LON61TUDINAL ROWS THAT y, u0un,g7
PAG 90'AJ�ART.THE PIPES SHALL HAVE A MINIMUM SLOPE OF , SN
6 %AN A MAX]AiUM SPACING OF 10 FEET ON CENTER.
GRAPHIC SCALE . "1 F .;.
1a D sit
lO JD B 1
/ / / / / I - •••3D:ya Oclwc DiFginy ••" SS 007A
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LEGEND
- ----> — TIME OF CONCENTRATION FLOW UNE
EnB ENON SANDY LOAM - GROUP C
EnD ENON SANDY LOAM - GROUP C
PRE-DEV POA-1
TOTAL AREA = 4.405 AC
CN 70
Tc= 7.4 min.
COVERAGE AND CN VALUES
LAND
GROUP
USE
AREA
B
C
D
CN
AREA CN
(ac)
(ac/CN)
(ac/CN)(ac/CN)
IMPERV.
0000
98
9W
900
0
0.00
0.00
2.20
0.00
WOODS'
2.203
55
70
154.21
"
BRUSH••
1.817
5�
70
'o
70
127.19
TOTAL
4.020 1
1
70
1 2131.40
COVERAGE AND CN VALUES
LAND
GROUP
USE
AREA
B
C
D
CN
AREAxCN
(ac)
ac/CN)
(ac/CN)
(ac/CN
IMPERV.
01094
9T
T.
98
98
9.21
0.00n
WOODS'
0.000
50.00
0
0.00
BRUSH '•
0.29170
560
70
7770
2037
TOTAL
0385
77
29.58
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DETAINED AREA
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PERVIOUS: 0,894 AC
TOTAL: 2.246 AC CN = 88
TC=5.0MIN
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COVERAGE AND CN VALUES
LAND
GROUP
USE
AREA
B
C
D
CN
AREA CN
(ac)
(ac/CN)
(ac/CN)
(ac/CN)
IMPERV.
1.271
0.
1.2
98
124.56
98
98
OPEN
0.870
0.00
0,87
0.0
74
64.38
61
74
so
00
0.00
WOODS
0
500
70
0
O.OD
TOTAL
2.141
88
188.94
COVERAGE_ AND CN VALUES__
LAND
GROUP
USE
AREA
B
C
ID
CN
AREAxCN
(ac)
(ac/CN
(ac/CN)
(ac
IMPERV.
0.081
oio
98
900
98
7.94
OPEN
0.024
0.00
0.02
0.00
74
1.78
61
74
80
0.00
MOD
WOODS
0
55
0
0.00
TOTAL
0.105
93
9.71
UNDETAINED AREA
IMPERVIOUS: 0.062 AC
PERVIOUS: 2.098 AC
TOTAL: 2.160 AC CN = 70
TC=10.0MIN
P-t Davwtnnmanf Iln<tofatnaA rN
COVERAGEAND CN VALUES
LAND
GROUP
USE
AREA
B
C
D
CN
AREAxCN
(ac)
(ac/CN)
(ac/CN)
(ac/CN)
IMPERV.
0
98
98
500
0
0.00
OPEN
1.245
OD
172
00
74
92.13
4
so
6
WOODS
0.634
550
'000
70
44.38
TOTAL
1.879
73
136.51
COVERAGE AND CN VALUES___
LAND
GROUP
USE
AREA
B
C
D
CN
AREAxCN
(ac)
(ac/CN)
(ac/CN)
(ac/CN)
IMPERV.
0.062
�
906
900
98
6.08
OPEN
0.219
0.00
0.22
0.00
74
16.21
61
74
80
WOODS
0
00
055
��00
0
0.00
n
TOTAL
0.281
79
22.28
r,.
GRAPHIC SCALE
30 0 15 30 EO
(IN FEET)
11nch = 30 ft.
N
N LOCATION MAP
e'OTTOSCALE
LEGEND
-----> - TIME OF CONCENTRATION FLOW ONE
EnB ENON SANDY LOAM - GROUP C
EnD MON SM4DY LOAM -GROUPC
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