STORMWATER MANAGEMENT PLAN - Cary · 2018-08-21 · est. 1 0 a nc lic. no. p-0799 z:\projects...

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43'

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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")

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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