20200110 Ver 1_PLTS-GRADING AND DRAINAGE-C2.9_20200203

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POND-1 DATA
BTM. AREA = 1,454 SF
CAPACITY = 9,388 CF © 4'
BTM. EL. = 2158.00
RIM EL. = 2164.00
Q1 EL.
--MAX POOLING EL. = 2162.00
I
I
I
BUILDING SETBACK LINE
I -
INV
2156.67
SWALE B, TO POND-1. SEE RIM
PLAN ON C2.2 & PROFILE _ _ 2164.
ON C2.7
2:1 SIDE SLOPES, TYP.
SWALE A, TO POND-1. SEE��
PLAN ON C2.2 & PROFILE
ON C2.7
RIM
216A 00
4" PERF. SCH 40 PVC SUBDRAIN
SEE DETAIL BELOW. GENERALLY
FOLLOW THE CENTER OF BASIN AND
SLOPE AT 0.50%
ACCESS & MAINTENANCE \
BERM. 8' MIN. WIDTH, TYP.
\ %
-1. SEE DETAIL BELOW.
18" HDPE, TYPE "S"
SLOPE AT 1.0% MIN.
FES CO-1. SEE STRUCTURE
CO E
SEED AS SPECIFIED AND INV / SCHEDULE ON C2.3
\/
STABILIZE W/ SC250 BY_ -
_� _NORTH AMERICAN GREEN. I 2156.00
JURISDICTIONAL WETLAND"
30' MIN. STREAM SETBACK TYPICAL.
TYP. EACH SIDE OF STREAM
PROPOSED PROPERTY - -
LINES, TYP. SEE Cl _
SERIES SHEETS. _
STORMWATER MANAGEMENT POND-1, ENLARGED PLAN
SCALE: 1 " = 30'
INV
2156.67
BTM
2158.00
PRE -DEVELOPMENT RUNOFF CALCULATIONS
DRAINAGE AREA
AREA
CURVE
Q1
Q10
Q100
NUMBER
PRE -DEVELOPMENT
52.61 AC.
68
8.08 CFS
83.42 CFS
116.09 CFS
PROJECT AREA
/ POND-2 DATA ,
j BTM. AREA = 10,132 SF
CAPACITY = 48,384 CF ® 4
/BTM. EL. = 2164.00 j CENTERLINE OF STREAM,
RIM EL. = 2170.00 TYPICAL.
Q1 EL. _
MAX POOLING EL. = 2168.00
j RIM
30' MIN. STREAM SETBACK
TYP. EACH SIDE OF STREAM
ACCESS & MAINTENANCE
BERM. 8' MIN. WIDTH, TYP.
INV
2162.68
SWALE A, TO POND-2. SEE, '
PLAN ON C2.2 & PROFILE
ON C2.7
PROPOSED PROPERTY
ILINES, TYP. SEE Cl
SERIES SHEETS.
BTM
2164
co
(_BUILDING SETBACK LINE
I � I
I /
2:1 SIDE SLOPES, TYP.
I SEED AS SPECIFIED AND
ST
ABILIZE
AMERICAN2GREEN.
� � I
I4" PERF. SCH 40 PVC SUBDRAIN
RIM / SEE DETAIL BELOW. GENERALLY
' 2170.00 ,' FOLLOW THE CENTER OF BASIN AND
IF / SLOPE AT 0.50%
18" HDPE, TYPE "S" BTM �
SLOPE AT 1.07MIN. /
/
2164
i
INV CO-2. SEE DETAIL BELOW.,
2161.00
'ES C0-2. SEE STRUCTURE
SCHEDULE ON C2.3
STORMWATER MANAGEMENT POND-2. ENLARGED PLAN
POST DEVELOPMENT RUNOFF CALCULATIONS
DRAINAGE AREA
AREA
CURVE
NUMBER
Q1
Q10
Q100
ATTENUATED
Q1
TO POND-1
7.00 AC.
70
1.53 CFS
12.63 CFS
17.28 CFS
0.28 CFS
TO POND-2
13.27 AC.
70
3.32 CFS
27.07 CFS
37.00 CFS
0.69 CFS
TO POND-3
4.53 AC.
70
1.08 CFS
8.89 CFS
12.14 CFS
0.26 CFS
UN -COLLEGE
CONTROLLED AREA
27.81 AC.
70
6.34 CFS
52.49 CFS
71.75 CFS
6.34 CFS
TOTAL
52.61 AC.
12.27 CFS
101.08 CFS
138.17 CFS
7.57 CFS
OUTLET CONTROL STRUCTURE
FRAME AND GRATE. SEE PLAN
ABOVE.
a
n° <
PRIMARY OUTLET PIPE _
15" HDPE SEE TABLE I -
FOR INVERTS
a °
-
SCH-40 "TEE" SECTION INSIDE BOX.
INSTALL CAP ON END POINTED TOWARD
OUTLET AND DRILL CONTROL ORIFICE IN
CAP (SEE TABLE). INSTALL PLUG IN EXISTING SUBGRADE
OPPOSING OPENING AND ORIENT TO
FACILITATE MAINTENANCE.
CONTROL OUTLET (CO) STRUCTURE
SCALE: NOT TO SCALE
PRECAST CONC. DRAINAGE
STRUCTURE.
4" PERF. SCH 40 PV
OUTLET CONTROL STRUCI
SLOPE AT C
" WASHED STONE.
4" PERF. PVC SCH 40
UNDERDRAIN SEE PLANS
ABOVE FOR LOCATION
POND SUBDRAIN
SCALE: NOT TO SCALE
SCALE: 1 " = 30'
CENTERLINE OF
STREAM
/
/ FLOATING SUCTION HOSE I
VARIABLE SPEED
PUMP
\
IMPERVIOUS SANDBAG DIKE I
JURISDICTIONAL -
WETLAND, TYP.
\M/
PRECAST CONC. HEADWALL, TYP.
EACH END OF CULVERT. NCDOT STD.,
838.80. SEE DETAIL ON C2.10
\DISCHARGE
HOSE
'
72" RCP CULVERT.
\
.EDGE OF PROPOSED
ASPHALT PAVING. ��
GREENWOOD PARK DR.
30' MIN. STREAM SETBACK SEE STREAM CROSSING
TYP. EACH SIDE OF STREAM \ \ PROFILE ON C2.7 AND
DETAIL ON C2.11
ENERGY DISSIPATION AREA RIP -RAP APRON -
REMOVE ONCE PUMP -AROUND SEQUENCE IS ,
COMPLETE. SEED AND STABILIZE AS SPECIFIED. I
ENLARGED STREAM CROSSING AND BYPASS
SLOPE BOTTOM OF BASIN
TOWARD SUBDRAIN AT 1.0%
" WASHED STONE. EXTEND
TO SURFACE/BTM OF POND.
WRAP SIDES AND BOTTOM
W/ SOIL SEPARATING FABRIC
EXISTING SUBGRADE
CONTROL OUTLET STRUCTURE DATA
STRUCTURE
ORIFICE
SIZE
RIM EL.
ORIFICE
EL.
OUTLET
EL.
CO-1
3.00
2161.00
2156.42
2156.30
CO-2
4.00
2165.50
2161.75
2161.40
CO-3
4.00
2175.00
2172.17
2171.40
PUMP DETAIL
SCALE: 1 "=20'
'/ »`/-- -
POND-3 DATA
BTM. AREA = 2,088 SF
CAPACITY = 13,924 CF ® 4' -
/ BTM. EL. = 2174.00 I
RIM EL. = 2180.00
Q1 EL.
/ MAX POOLING EL. = 2178.00
/ BUILDING SETBACK LINE
- - I
PROPOSED PROPERTY
i I INFS TYP SFF C:1 I
MH#6.0
STA=8+08.80 OFF=0.00
i RIM=2164.00
S 8" INV=2144.25
E 8" INV=2158.40
NW 6" INV=2158.40 - -
30' MIN. STREAM SETBACK
TYP. EACH SIDE OF STREAM
CENTERLINE OF
- STREAM
1
MH#5.0
STA=7+09.61 OFF=0.00
RIM=2152.26
W 8" INV=2143.55
N 8" INV=2143.75
E 8" INV=2147,00
S 8" INV=2148.00 S
PERMANENT STREAM CROSSING INSTALLATION NOTES:
V /
SWALE A, TO POND-3. SEE
PLAN ON C2.2 & PROFILE
ON C2.7
' CENTERLINE OF STREAM,
TYPICAL. ,
RIM
2180.00 ---
BTM \
2174.00
r \
INV \ /
172.67 \
30' MIN. STREAM SETBACK
TYP. EACH SIDE OF STREAM \
ACCESS Xr MAINTENANCF \
/ 4" PERF. SCH 40 PVC SUBDRAIN '
SEE DETAIL BELOW. GENERALLY
FOLLOW THE CENTER OF BASIN AND '
SLOPE AT 0.50% cn
2:1 SIDE SLOPES, TYP. Yl
N SEED AS SPECIFIED AND
_ STABILIZE W/ SC250 BY
_ BTM NORTH AMERICAN GREEN.
2174.00
CB CO-3. SEE DETAIL BELOW.
/'6/
RIM 18" HDPE, TYPE "S" '
2180.00 SLOPE AT 1.0% MIN.
' FES CO-3. SEE STRUCTURE /
INV SCHE DU LE ON C2.3
_ 2171.00
STORMWATER MANAGEMENT POND-3. ENLARGED PLAN
SEE STREAM CROSSING
PROFILE BELOW.
PROPOSED 20' SANITARY
SEWER EASEMENT, TYP.
SEE STREAM BANK REPAIR
DETAIL ON SHEET C2.11 \
PROPOSED 8" SANITARY
SEWER MAIN.
IMPERVIOUS SANDBAG
_ DIKE
--- FLOATING SUCTION
HOSE
VARIABLE SPEED
I PUMP
I
DISCHARGE HOSE
ENLARGED SANITARY SEWER STREAM
CROSSING AND BYPASS PUMP DETAIL
1. ALL WORK SHALL FOLLOW STANDARDS SET FORTH IN WATER QUALITY GENERAL
CERTIFICATION NO.4135.
2. ALL STRUCTURES SHALL BE PRECAST CONCRETE. NO "LIVE" CONCRETE SHALL BE
USED IN OR NEAR THE STREAM IMPACT AREA.
3. ENSURE A FIRM AND STABLE BASE IS IN -PLACE PRIOR TO PLACEMENT OF
PRECAST STRUCTURES.
4. REFER TO NCDOT STD. PIPE BEDDING DETAILS ON C2.9 FOR PIPE BEDDING.
5. GROUT FILL USING NON -SHRINK GROUT ALL JOINTS BETWEEN THE CONC. PIPE
AND THE CONCRETE HEADWALL. INSTALL GROUT ON EACH SIDE OF THE HEADWALL.
6. WHERE PIPES AND HEADWALLS ARE SKEWED A LARGER HEADWALL MAY BE
REQUIRED. HEADWALLS MAY BE ADJUSTED TO ALIGN WITH THE PIPE PROVIDED NO
PORTION OF THE HEADWALL IMPEDES THE OPEN STREAM CHANNEL.
7. INSTALL THE PIPE AND HEADWALL SUCH THAT THE BOTTOM OF THE PIPE IS 12"
BELOW THE EXISTING BOTTOM OF THE CHANNEL.
8. INSTALL PIPES AT THE SAME SLOPE AS THE EXISTING CHANNEL IN WHICH THEY
ARE BEING INSTALLED.
9. ALL WORK SHALL BE CONDUCTED IN THE DRY.
10. CONDUCT WORK SO THAT THE FLOWING STREAM DOES NOT COME INTO CONACT
WITH THE DISTURBED AREA.
11. STREAM BANKS TO BE STABILIZED IN ACCORDANCE WITH STANDARDS. DO NOT USE
MATTING THAT INCORPORATES PLASTIC MESH AND OR PLASTIC TWINE ALONG
STREAM BANKS.
12. STABILIZE ANY STREAM BANK DISTURBANCE AT THE END OF EACH WORKING DAY.
13. PUMP -AROUND SEQUENCE SHOULD BE KEPT TO THE MINIMAL AMOUNT OF TIME
REQUIRED FOR CULVERT INSTALLATION.
SCALE: 1 "=20'
I4V-1;•7
2160
U)
2155
2150
2145
2140
BOTTOM OF STREAM BED
SCALE: 1 " = 30'
19II�I..�'S�l
1. ALL WORK SHALL FOLLOW STANDARDS SET FORTH IN WATER QUALITY GENERAL
CERTIFICATION N0.4133.
2. WETLANDS SHALL BE RESTORED TO ITS PRE -CONSTRUCTION CONDITION.
3. DURING EXCAVATION FOR THE TEMPORARY WETLAND IMPACTS TOP -SOILS AND
SUB -SOILS SHALL BE SEGREGATED AND PLACED ON FABRIC TO MINIMIZE IMPACTS
WHENEVER POSSIBLE.
4. REFER TO NCDOT STD. PIPE BEDDING DETAILS ON C2.10 FOR PIPE BEDDING.
5. BACKFILL WITH THE SEGREGATED SOILS IN APPROPRIATE LIFTS.
6. RESTORE GRADES TO PRE CONSTRUCTION CONDITIONS REMOVING EXCESS SOIL
FROM THE AREA.
TEMPORARY STREAM CROSSING INSTALLATION NOTES:
1. ALL WORK SHALL FOLLOW STANDARDS SET FORTH IN WATER QUALITY GENERAL
CERTIFICATION NO.4133.
2. ALL STRUCTURES SHALL BE PRECAST CONCRETE. NO "LIVE" CONCRETE SHALL BE
USED IN OR NEAR THE STREAM IMPACT AREA.
3. ENSURE A FIRM AND STABLE BASE IS IN -PLACE PRIOR TO PLACEMENT OF
PRECAST STRUCTURES.
4. REFER TO NCDOT STD. PIPE BEDDING DETAILS ON C2.10 FOR PIPE BEDDING.
5. ALL WORK SHALL BE CONDUCTED IN THE DRY.
6. CONDUCT WORK SO THAT THE FLOWING STREAM DOES NOT COME INTO CONACT
WITH THE DISTURBED AREA.
7. STREAM BANKS TO BE STABILIZED IN ACCORDANCE WITH STANDARDS, AND THE
DETAIL SHOWN ON C2.11. DO NOT USE MATTING THAT INCORPORATES PLASTIC
MESH AND OR PLASTIC TWINE ALONG STREAM BANKS.
8. STABILIZE ANY STREAM BANK DISTURBANCE AT THE END OF EACH WORKING DAY.
9. PUMP -AROUND SEQUENCE SHOULD BE KEPT TO THE MINIMAL AMOUNT OF TIME
REQUIRED FOR CULVERT INSTALLATION.
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2165
2160
2155
2150
2145
99 LF OF 8" PVC SDR-35 ® 0.50%
2140
7+00 8+00 8+20
SANITARY SEWER STREAM
CROSSING SECTION
SCALE: HORIZ. 1 "=40', VERT. 1 "=4'
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ISSUED FOR: DATE: BY: m
REVIEW 01/14/20 RDH n
REVIEW 02/03/20 DOB 0
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JOB NO.
GNW2001 .01 A c
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