20150609 Ver 1_Stormwater Site Plans_20150619 (3)

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EXTEND WING WALL
FROM NCDOT STANDARD _ - - - -� 85 -AA
PRECAST HEADWALL
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AT-CL 297.150 10' TO? WROTH
EL 2g8.50 W ►TH = — — — \ I \ I I /
— ABANDON EXISTING 8" DIP I I I 1 I I I I
84.25 WITH FLOWABLE FILL ( I I I
2
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4' X 12' CONCRETE
Q.
RISER STRUCTURE N I 1 1 I I I II I I 1
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APPROX. POND
BOTTOM ELEV: 288.00 R �� N APE R
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/ 12 WIDE CONCRETE I I I I �� 20 I 1 50
EMERGENCY SPILLWAY III ELEV: 295.50 I ZON
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GRAPHIC SCALE
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1 inch = 20 ft.
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EXISTING POND
o DIMENSIONS ELEV.
0
`s NORMAL POOL
87,100 SF
294.25
ASSUMED POND BOTTOM
N
DATE
288.00
TRANSPORTATION
DATE
PLANNING
TOP OF BERM
10 FEET WIDE
298.50
DATE
PLANNING — TRANSPORTATION
DATE
100 —YEAR WATER SURFACE
WORKS — WATER /SEWER
297.51
a NORMAL POOL WEIR
10' WIDE
294.25
_° RISER CREST
12' ID x 4' ID
294.75
o EMERGENCY SPILLWAY
12' WIDE
295.50
0
OUTLET PIPE INVERT @ RISER
72 LF OF 2 -48"
288.00
R OUTLET PIPE INVERT Q FES
ORING RCP @ 2.8� 286.00
EXISTING POND IMPROVEMENTS I" =201
INCREASE DAM HEIGHT 12"
WITH 2.5:1 SLOPES
4' X 12' CONCRETE
RISER STRUCTURE
CREST ELEV: 294.75
TEMPORARY POOL
DURING 100 —YEAR ST01
NnPMAI Pnni
ELEV: 294.25
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EXISTING POND
�IEdI1
li-
ANTI — FLOTATION DEVICE ANTI —SEEP 7
COLLAR /
0 —RING GASKETED CLASS III
48" RCP OUTLET PIPES (2)
EXISTING POND CROSS SECTION
NTS.
10' DAM WIDTH
ELEV: 298.50
EXISTING DAM
16' WIDTH
ELEV: 297.50
EMERGENCY SPILLWAY
12' WIDE CONCRETE
ELEV: 295.50
EXISTING
EARTH DAM
-III=
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I-
'
EL. 294.75
EL. 288.00
NOTES:
1. RISER BARREL, SKIMMER AND OUTLET PIPE SHALL BE INSTALLED AT PRIOR TO
THE BEGINNING OF OVERALL SITE GRADING AND SHALL BE UTILIZED AS A
SEDIMENT CONTROL DEVICE DURING ROADWAY AND UTILITY CONSTRUCTION. ONCE
THE SITE HAS BEEN STABILIZED AND GRADING IS COMPLETED THE BASIN SHALL
BE CLEANED OUT AND STABILIZED. THE SKIMMER DEVICE SHALL BE REMOVED,
THE BOTTOM DRAIN CLOSED AND THE NORMAL POOL ESTABLISHED.
2. DAM EMBANKMENT AND ALL SLOPES SHALL BE STABILIZED PER EROSION
CONTROL SEEDING SCHEDULE OR SOD.
3. ALL CONSTRUCTION TO BE IN ACCORDANCE WITH ALL TOWN OF APEX
STANDARDS. ALL APPLICABLE LOCAL AND STATE ENVIRONMENTAL PERMITS
SHALL BE OBTAINED PRIOR TO START OF CONSTRUCTION.
4. STORMWATER MANAGEMENT FACILITIES SHALL BE DESIGNED PER THE TOWN OF
APEX STANDARDS AND REGULATIONS FOR STORMWATER QUANTITY AND QUALITY
(UDO SECTION 6.1). POST DEVELOPMENT RATES FOR THE 1 —YEAR AND
10 —YEAR, 24 —HOUR STORMS.
13' -6"
12'
.n
I
GRATE OFFSET
Tj
II II II II
1_1C>
EXISTING POND RISER TOP DETAIL
NTS
42" RCP I 142" RCP
NORTH WAIL
PRECAST CONCRETE
TOP SLAB W /GRATE
NORMAL POOL
10' X 6" WEIR
ELEV: 294.25
SOUTH WAIL
EXISTING POND RISER WALL ELEVATIONS
NTS
GRATED COVER ACCESS
TOP OF RISER SLAB TOP
I I
RISER CREST
PRECAST REINFORCED BOX
MANHOLE STEPS
(SEE NCDOT 840.66)
114 "x 2" STEEL STRAP
0 -RING' JOINT W/ 2 - 314" ANCHOR
—� BOLTS 2 STRAPS REO'D
GROUT EACH SIDE
JOINT SEALED WITH A -LOK NEOPRENE
—n GASKET (OR APPROVED EQUAL)
CAST IN MANHOLE WALL
POND BOTTOM CLASS 111 0 -RING RCP
/ / /� \ / /� \ / /�� /�� /�� /•�� INV. OUT
6" GROUT
• •• ;•� .. :. • a •U ' TOP OF ANTI - FLOATATION
EXISTING POND RISER DETAIL
NTS
PRI
NOT APP
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1/00 M ° 00F, o
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EAST & WEST
WALLS
►RY
TRUCTION
THE SIGNATURES AFFIXED BELOW CERTIFY THAT THIS SHEET HAS BEEN REVIEWED AND APPROVED SOLELY
PER THE CERTIFICATIONS SIGNED ON THE COVER SHEET OF THESE CONSTRUCTION PLANS.
CM —
ENGINEERING
DATE
PUBLIC WORKS — ENV. PROGRAMS
DATE
CM —
TRANSPORTATION
DATE
PLANNING
DATE
CM —
BUILDING INSPECTIONS
DATE
PLANNING — TRANSPORTATION
DATE
PUBLIC
WORKS — WATER /SEWER
DATE
FIRE
DATE
PUBLIC
WORKS — ELECTRIC
DATE
PARKS, RECREATION & CULTURAL RES
DATE
PUBLIC
WORKS — S & E
DATE
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