stormwater management plan - cary · 2018-08-21 · est. 1 0 a nc lic. no. p-0799 z:\projects...
TRANSCRIPT
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161.80'
112.
43'
31
36.04'
75.00'
LOT
9,715 SQFT.0.22 AC.
MAXIMUM IMPERVIOUSSURFACE 4,500 SF
VEGETATED SHELFPLANTINGS
SLOPE STABILIZATION(TURF GRASS)
SLOPE STABILIZATION(NATIVE GRASS)
STORM DRAINAGE TABLE
INLET#
200
201
TYPE
FES
RS
RIM ELEV(EOP)
303.70
307.75
INV IN(FROM-SIZE)
301.37(201-24")
INV OUT(TO-SIZE)
304.50(200-24")
NOT FOR CONSTRUCTION
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1. THIS DEVELOPMENT IS NOT LOCATED IN A FLOOD PLAIN.
2. THIS DEVELOPMENT IS LOCATED IN THE LOWER NEW HOPE WATERSHED WITHIN CAPE FEAR RIVER BASIN WITHIN THE JORDAN LAKE
SUB-BASIN. PROJECT IS "HIGH DENSITY" OPTION DEVELOPMENT USING A WET DETENTION POND FOR TSS REMOVAL AND PEAK FLOW
ATTENUATION.
3. WET DETENTION BASIN SHALL BE DESIGNED AND CONSTRUCTED IN ACCORDANCE WITH THE NORTH CAROLINA DEPARTMENT OF
NATURAL RESOURCES STORMWATER BMP MANUAL - LATEST EDITION. WET DETENTION BASIN PROVIDES WATER QUALITY TREATMENT
FOR TSS, TN AND TP.
4. THE PROJECT MEETS ALL OF THE REQUIREMENTS RELATIVE TO BEST MANAGEMENT PRACTICES AND ENGINEERED STORMWATER
CONTROL STRUCTURES AS OUTLINED IN THE TOWN OF CARY LDO (CHAPTER 4 PART 4.6)
5. MAXIMUM SLOPE OF BASIN IS 3:1
6. ALL SIDE SLOPES, EMBANKMENTS AND SPILLWAYS SHALL BE COMPACTED TO MINIMUM 95% STANDARD PROCTOR PER ASTM-D698.
7. CONTROLLED FILL, AS SPECIFIED BY THE RESIDENT ENGINEER, IN THE DAM EMBANKMENT SHALL BE PLACED IN 6-INCH LOOSE LAYERS
(3-INCH LOOSE LAYERS WITHIN 3-FEET OF EITHER SIDE OF THE PRINCIPAL SPILLWAY PIPE TO A DEPTH OF 2-FEET OVER THE PIPE) AND
SHALL BE COMPACTED TO A DENSITY OF NO LESS THAN 95% OF THE STANDARD PROCTOR MAXIMUM DENSITY AT A MOISTURE
CONTENT OF + OR - TWO PERCENTAGE POINTS OF THE OPTIMUM MOISTURE CONTENT IN ACCORDANCE WITH ASTM-D698.
8. ALL VISIBLE ORGANIC DEBRIS SUCH AS ROOTS AND LIMBS SHALL BE REMOVED FROM THE FILL MATERIAL PRIOR TO COMPACTION TO
THE REQUIRED DENSITY. SOILS WITH ORGANIC MATTER CONTENT EXCEEDING 5% BY WEIGHT SHALL BE USED. STONES GREATER THAN
3-INCH (IN ANY DIRECTION) SHALL BE REMOVED FROM THE FILL PRIOR TO COMPACTION.
9. FILL MATERIAL PLACED AT DENSITIES LOWER THAN SPECIFIED MINIMUM DENSITIES OR AT MOISTURE CONTENTS OUTSIDE THE
SPECIFIED RANGES OR OTHERWISE NOT CONFORMING TO SPECIFIED REQUIREMENTS SHALL BE REMOVED AND REPLACED WITH
ACCEPTABLE MATERIALS.
10. ANY FILL LAYER THAT IS SMOOTH DRUM ROLLED TO REDUCE MOISTURE PENETRATION DURING A STORM EVENT SHALL BE PROPERLY
SCARIFIED PRIOR TO THE PLACEMENT OF THE NEXT SOIL LIFT.
11. SURFACE WATER AND STREAM FLOW SHALL BE CONTINUOUSLY CONTROLLED THROUGHOUT CONSTRUCTION AND THE PLACEMENT OF
CONTROLLED FILL.
12. FOUNDATION AREAS MAY REQUIRE UNDERCUTTING OF COMPRESSIBLE AND/OR UNSUITABLE SOILS IN ADDITION TO THAT INDICATED ON
THE PLANS. ALL SUCH UNDERCUTTING SHALL BE PERFORMED AT THE DISCRETION OF THE GEOTECHNICAL ENGINEER AND SHALL BE
MONITORED AND DOCUMENTED. IN NO CASE SHALLTHERE BE AN ATTEMPT TO STABILIZE AND PORTIONS OF THE FOUNDATION SOILS
WITH CRUSHED STONE.
13. TREATMENT OF SEEPAGE AREAS, SUBGRADE PREPARATION, FOUNDATION DEWATERING AND ROCK FOUNDATION PREPARATION (I.E.,
TREATMENT WITH SLUSH GROUTING, DENTAL CONCRETE, ETC.) MAY BE REQUIRED AT THE DISCRETION OF THE RESIDENTIAL
ENGINEER. ALL SUCH ACTIVITIES SHALL BE CLOSELY MONITORED AND DOCUMENTED BY THE GEOTECHNICAL ENGINEER.
14. FILL ADJACENT TO THE RISER AND PRINCIPAL SPILLWAY PIPE SHALL BE PLACED SO THAT LIFTS ARE AT THE SAME LEVEL ON BOTH
SIDES OF THE STRUCTURES.
15. EARTHWORK COMPACTION WITHIN 3-FEET OF ANY STRUCTURES SHALL BE ACCOMPLISHED BY MEANS OF HAND TAMPERS, MANUALLY
DIRECTED POWER TAMPERS OR PLATE COMPACTORS OR MINIATURE SELF-PROPELLED ROLLERS.
16. COMPACTION BY MEANS OF DROP WEIGHTS FROM A CRANE OR HOIST SHALL NOT BE PERMITTED.
17. HEAVY EQUIPMENT SHALL NOT BE ALLOWED TO PASS OVER CAST-IN-PLACE STRUCTURES UNTIL ADEQUATE CURING TIME HAS
ELAPSED.
18. TO RE-ESTABLISH VEGETATION AFTER CONSTRUCTION, A 2- TO 3-INCH LAYER OF TOPSOIL SHALL BE PLACED ON THE DISTURBED
EMBANKMENT SURFACE AND THE AREA SEEDED AND MULCHED OR HYDROSEEDED.
19. ALL RISER STRUCTURES, INCLUDING WEIR WALL TYPE STRUCTURES, SHALL BE REINFORCED CONCRETE. BRICK/CONCRETE BLOCK AND
MORTAR TYPE STRUCTURES WILL NOT BE ACCEPTED.
20. ALL RISER STRUCTURES SHALL BE LOCATED SUCH THAT DIRECT ACCESS FROM THE DAM EMBANKMENT CAN BE ACHIEVED.
21. RISER STRUCTURES WITH MULTIPLE BARREL SECTIONS SHALL HAVE GASKETTED JOINTS, AND EACH SECTION SHALL BE BOLTED TO
ADJACENT SECTIONS WITH STAINLESS STEEL STRAPS. STEEL STRAPS SHALL BE MINIMUM 4" WIDE, 1/4" THICK, STRAP CENTERED ON
JOINT WITH MINIMUM 2" OVERLAP. ATTACH STRAP TO BARREL SECTIONS WITH (2) 1/2" HEXBOLTS EMBEDDED IN STRUCTURE 3 INCHES.
EPOXY BOLTS INTO STRUCTURE.
22. ALL SOIL MATERIAL BEHIND RETAINING WALLS SHALL BE AS REQUIRED BY SEGMENTAL BLOCK WALL MANUFACTURE. A DRAINAGE
LAYER AS SPECIFIED BY MANUFACTURER SHALL BE INSTALLED.
23. CONTRACTOR SHALL SUBMIT SHOP DRAWINGS FOR APPROVAL TO ENGINEER OR OWNER FOR FENCE PRIOR TO INSTALLATION.
24. THIS PROJECT WILL MEET ALL REQUIREMENTS OF BEST MANAGEMENT PRACTICES AND ENGINEERED STORMWATER CONTROL
STRUCTURES AS OUTLINED IN THE TOWN OF CARY LAND DEVELOPMENT ORDINANCE (CHAPTER 4, PART 4.6).
25. CLAY LINER SHALL BE A MINIMUM 8 INCHES THICK. CLAY LINER SHALL BE INSTALLED AT A DEPTH SUFFICIENT ENOUGH SUCH THAT IT
DOES NOT IMPEDED THE GROWTH OF VEGETATION OR CAN BE PENETRATED BY ROOTS OF VEGETATION. CLAY LINER SHALL LIMIT
INFILTRATION RATE TO 0.01 IN/HR. CLAY LINER SHALL BE INSTALLED UP TO PERMANENT POOL ELEVATION THROUGHOUT POND.
ALTERNATIVE LINERS MAYBE ACCEPTABLE IF APPROVED BY ENGINEER OF RECORD.
GENERAL NOTES:
SCALE:
1
C-12
WET DETENTION BASIN - PLAN VIEW1"=20'
SCALE:
2
C-12
WET DETENTION BASIN - SECTION VIEWN.T.S
20' 40'
SCALE IN FEET
10'20'
SCALE: 1 IN = 20 FT
SCALE IN FEETHORIZONTAL
0
SCALE:
5
C-12
EMERGENCY SPILLWAY DETAILN.T.S.
3,000 PSI CONCRETE
NO.3 STIRRUPS @ 12" O.C.
NO.5 REBAR @ 12" O.C.
12" TYP
3" CLR
3" CLR
NOTES:
1. CONCRETE DESIGN & CONSTRUCTION SHALL BE IN ACCORDANCE WITH LATEST EDITION
OF ACI SPECIFICATIONS. CONCRETE SHALL BE A MINIMUM OF 3,000 PSI WITH #3
STIRRUPS AT 12" O.C.
2. CONTRACTOR SHALL FINISH ALL CONCRETE SURFACES WITH BROOM.
3. REINFORCING SHALL BE ASTM 615, GR 60. SPLICE LENGTHS SHALL BE CLASS B.
30'
CREST LENGTH
TOP OF DAM
ELEV = 311.00SPILLWAY
ELEV = 310.00
NO.3 STIRRUPS @ 12" O.C.
NO.5 REBAR @ 12" O.C.
BOTTOM
ELEV = 307.50
18"
SCALE:
3
C-12
RISER STRUCTURE DETAILN.T.S.
3:1
24" GASKETTED O-RING
RCP OUTLET PIPE
ANTI-VORTEX TRASH RACK
ANCHORED TO RISER. CONTRACTOR
TO SUBMIT SHOP DRAWINGS PRIOR
TO INSTALLATION. ANCHOR TO
CONCRETE RISER IN 4 LOCATIONS.
MANHOLE
STEPS, TYP
CREST = 308.25
INV = 304.50
BOTTOM = 302.00
12"
DRAW DOWN
ORIFICE
INV = 305.00
4"x4" PVC TEE
4" PLUG
SET TOP OF PVC PLUG AT
TEMPORARY POOL
DRILL 2.0" ØOPENING IN 4" PLUG
TOP OF
BERM = 311.00
FILL WITH LEAN CONCRETE
FROM INVERT OF OUTLET PIPE
TO MANHOLE EXTENDED BASE
(4) 6" DIAMETER ORIFICE
KNOCKOUTS
INV ELEV= 306.75
BOTTOM OF POND
ELEV = 300
PERMANENT POOL = 305.00
TEMPORARY POOL = 306.75
STANDARD
MANHOLE BASE
6"
48" DIAMETER
PRE-CAST
MANHOLE
PLANTING QUANTITIES
SHELF AREA SHRUBS REQUIRED
2,166 SF 542 PLANTS
**MINIMUM 50 PLANTS PER 200 SF OF VEGETATED SHELF AREA**
HERBACEOUS PLANTS
ACORUS SUBCORDATUM SWEETFLAG
ALISMA SUBCORDATUM WATER PLANTAIN
HYDROLEA QUADRIVALVIS WATERPOD
IRIS VIRGINICA BLUE FLAG IRIS
JUNCUS EFFUSUS VAR. PYLAEI OR SOLUTUS SOFT RUSH
LUDWIGIA SPP. PRIMROSE WILLOW
PELTANDRA VIRGINICA ARROW ARUM
PONTEDERIA CORDATA PICKERELWEED
SAGITTARIA LATIFOLIA DUCK POTATO
SAGITTARIA LANCIFOLIA BULLTONGUE
SAURURUS CERNUUS LIZARD’S TAILSCHOENOPLECTUS TABERNAEMONTANI SOFT STEM BULRUSH
SCHOENOPLECTUS AMERICANUS THREE-SQUARE BULRUSH
SCHOENOPLECTUS PUNGENS VAR. PUNGENS
SCIRPUS CYPERINUS WOOLGRASS
ZIZANIOPSIS MILIACEA GIANT CUTGRASS
SHALLOW WATER PLANT LIST
BOTANICAL NAME COMMON NAME
HERBACEOUS PLANTS
ASCLEPIAS INCARNATA SWAMP MILKWEED
CAREX TENERA QUILL SEDGE
CHELONE GLABRA WHITE TURTLEHEAD
EUPATORIADELPHUS DUBIUS DWARF JOE PYE WEED
EUPATORIADELPHUS FISTULOSUS JOE PYE WEED
EUPATORIADELPHUS MACULATUS SPOTTED TRUMPETWEED
HIBISCUS COCCINEUS SCARLET ROSE MALLOW
HIBISCUS LAEVIS HALBERDLEAF ROSEMALLOW
KOSTELETZKYA VIRGINICA SEASHORE MALLOW
LOBELIA CARDINALIS CARDINAL FLOWER
LOBELIA ELONGATA LONGLEAF LOBELIA
LOBELIA SIPHILITICA GREAT BLUE LOBELIA
RHYNCHOSPORA COLORATA STARRUSH WHITETOP
SACCHARUM BALDWINII NARROW PLUMEGRASS
SHALLOW LAND PLANT LIST
BOTANICAL NAME COMMON NAME
SHRUBS
ARONIA ARBUTIFOLIA RED CHOKEBERRY
CEPHALANTHUS OCCIDENTALIS COMMON BUTTONBUSH
CLETHRA ALNIFOLIA SWEET PEPPERBUSH
CORNUS AMOMUM SILKY DOGWOOD
CYRILLA RACEMIFLORA TITI
GORDONIA LASIANTHUS LOBLOLLY BAY
HYPERICUM DENSIFLORUM BUSHY ST. JOHNSWORT
ILEX DECIDUAS POSSUMHAW
ILEX GLABRA INKBERRY
ITEA VIRGINICA VIRGINIA SWEETSPIRE
ROSA PALUSTRIS SWAMP ROSE
VACCINIUM CRASSIFOLIUM CREEPING BLUEBERRY
VIBURNUM NUDUM VAR. NUDUM POSSUMHAW
LEGEND
3:1 SLOPE
STABILIZE WITH NATIVE
GRASS (NO WEEPING LOVE
GRASS)
RIP RAP EMERGENCY
SPILLWAY
BOTTOM ELEV = 348.50
NCDOT CLASS "B" RIP RAP24" RCP OUTLET
PIPE
3:1 SLOPE
CAST-IN-PLACE CONCRETE
SPILLWAY-REFER TO
DETAIL, THIS SHEET
MAIN POND
PERMANENT POOL = 305.00
TEMPORARY POOL = 306.75
TOP SEDIMENT ELEV = 300.50
BOTTOM SEDIMENT ELEV = 300.00
NOTES:
1. CONTRACTOR SHALL INSTALL FILTER
DIAPHRAGM ON DAM OUTLET PIPE.
2. COORDINATE WITH ENGINEER ON
APPROVED MATERIALS AND INSTALLATION
TECHNIQUES PRIOR TO INSTALLATION.
3. LOCATION OF UNDERDRAINS MAY VARY
TO DAYLIGHT.
FLOW
SCALE:
4
C-12
SAND DIAPHRAGMN.T.S.
3'
6'6'
1.5 x DIA = 3'
3 x DIA =6'**
2' MIN.
** 2' MIN. FROM TOP OF DAM
GOVERNS IF 3 x DIA. IS NOT
AVALIABLE.
6' WIDE - 6:1 VEGETATED SHELF
TOP ELEV.= 305.50
P.POOL ELEV = 305.00
BOTTOM ELEV.= 304.50
6' VEGETATED
SHELF
TOP OF DAM
24" RCP
OUTLET
FINE SAND FILTER
PER ASTM C33
SHALLOW WATERSHALLOW LAND
REFER TO TABLES ON
THIS SHEET FOR
PLANTING LIST &
QUANTITY
FOREBAY
TOP SED. ELEV = 302.50
BOTTOM SED. ELEV = 302.00
FES
200
RS
201
1. WET POND PLANTINGS SHALL CONTAIN A MINIMUM OF 3 DIVERSE SPECIES OF SHALLOW WATER AND SHALLOW LAND
HERBACEOUS VEGETATION ON THE VEGETATED SHELF. MINIMUM 50 PLANTS PER 200 SF OF VEGETATED SHELF AREA. SEE
TABLE THIS SHEET FOR LIST OF APPROVED PLANTS. WETLAND SEED MIX IS NOT AN ACCEPTABLE SUBSTITUTE FOR
PLANTINGS. WETLAND SEED MIX MAYBE USED WITH IN POOL.
2. SHALLOW WATER PLANTS SHALL BE PLANTED WITHIN AREA OF VEGETATED SHELF SUBMERGED 6 INCH IN THE PERMANENT
POOL. SHALLOW LAND PLANTS SHALL BE PLANTED WITHIN AREA OF VEGETATED SHELF UN-SUBMERGED IN THE PERMANENT
POOL.
3. PLANTS SHALL BE OF AT LEAST 4 CUBIC INCH CONTAINER SIZE.
4. SPACING OF PLANTINGS SHALL BE 24" TO 36" ON CENTERS.
5. IF TREES AND SHRUBS ARE PLANTED FOR AESTHETICS PER OWNER'S REQUEST, THEY SHALL BE OUTSIDE OF THE POND AND
SELECTED TO MAXIMIZE SHADING. NO TREES SHALL BE PLANTED WITHIN THE EMBANKMENT OF THE POND.
6. TOP OF BERMS AND SLOPES SURROUNDING POND SHALL BE SEEDED WITH CENTIPEDE GRASS.
7. THE SOIL MIX MUST BE UNIFORM AND FREE OF STONES, STUMPS, ROOTS, OR OTHER SIMILAR MATERIAL GREATER THAN 2
INCHES IN DIAMETER.
8. THE PH SHOULD BE BETWEEN 4.5 AND 7.0. IF THE PH FALLS OUTSIDE OF THIS RANGE, IT MAY BE MODIFIED WITH LIME TO
INCREASE THE PH OR IRON SULFATE AND SULFUR TO LOWER THE PH. THE LIME OR IRON SULFATE MUST BE MIXED
UNIFORMLY INTO THE SOIL PRIOR TO USE.
9. TOPSOIL CAN BE NATIVE IF STOCKPILED ON-SITE SOILS OR IMPORTED TO THE DEVELOPMENT FROM OTHER LOCATIONS.
PROVIDE SOIL ANALYSIS FOR ALL TOPSOIL TO BE USED WITHIN A BMP FACILITY.
BMP LANDSCAPE NOTES:
24"
TW / 314.00
BW / 308.00
TW / 314.00
BW / 308.00
TW / 311.50
BW / 311.00
TW / 312.75
BW / 308.00
300
305
310
310
305
SHALLOW WATER
SHALLOW LAND
TW / 313.75
BW / 308.00
TW / 313.00
BW / 311.00
TW / 311.50
BW / 311.00
RETAINING WALL WITH
ORNAMENTAL FENCE AT
TOP. REFER TO DETAILS
FOREBAY BERM
TOP ELEV = 306.00
WEIR ELEV = 305.00
11'
RIP-RAP OUTLET PROTECTION
NCDOT CLASS "1" RIP-RAP
L=16', W1=6', W2=8', d=24"
D50=13"
Dmax=20"
PERMANENT POOL ELEV = 305.00
10' WIDE
BERM
30' EMERGENCY SPILLWAY
WQV TEMPORARY POOL ELEV = 306.75
2'
42" HIGH ORNAMENTAL
SAFETY FENCE
MODULAR RETAINING
WALL
BOTTOM EL. 310
PRECAST RISER STRUCTURE
W/ TRASH RACK-REFER TO
DETAIL, THIS SHEET
ELEV = 311.00
3
1
3
1
24" RCP @ 5.0%(O-RING JOINTS ASTM C443)
COMPACTED SUBGRADE
SAND DIAPHRAGM-REFER
TO DETAIL, THIS SHEET
MAIN PERMANENT POOL
BOTTOM ELEV = 302.00
SEDIMENT STORAGE
ELEV = 302.50
2.5
11 FOREBAY
FOREBAY WEIR BOTTOM
ELEV = 305.00
FOREBAY BERM
TOP ELEV = 306.00
SEDIMENT STORAGE ELEV = 300.50
BOTTOM ELEV = 300.00STORM WATER SURFACE ELEVATIONS
100 YEAR 310.70
25 YEAR 310.27
10 YEAR 309.60
5 YEAR 309.03
2 YEAR 308.43
1 YEAR 308.04
REFER TO TABLE ON THIS
SHEET FOR WATER SURFACE
ELEVATION AT DESIGN STORMS
2.5
6' VEGETATED SHELF AT 6:1 MAX
SLOPE. PERMANENT POOL TO BE
CENTERED IN SHELF1
3
** SHWT ELEVATION = 306.33 **
EMERGENCY SPILLWAY.
REFER TO DETAIL ON THIS
SHEET
4" PERFORATED PVC
WRAPPED IN FABRIC TO
DAYLIGHT
4" PERFORATED PVC
WRAPPED IN FABRIC TO
DAYLIGHT
3
1
REFER TO NOTES FOR
EMBANKMENT COMPACTION
CLAY LINER - REFER TO
NOTE #25
RIP-RAP OUTLET PROTECTION
NCDOT CLASS "B" RIP-RAP
L=18', W1=9', W2=11', d=18"
D50=6"
Dmax=9"
TOWN OF CARY SIGNATURE SET
APPROVED by the Town of CaryDevelopment Review Committee
08/09/2018By: Kevin A. Hales