20180311 Ver 1_Design/Maps/Site Plans 3/4/18_20180305

PLAN TYPE:SHEET NUMBER
90% PLANS - PERMITTING
MORRISVILLE, NC - WAKE CO.
1301 MORRISVILLE PKWY
MAFC - UT CRABTREE CREEK
COVER 1.1
APPROVED :
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PROJECT
NAME :
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PROJECT #
REVISION #

GDJ MAFC
AS NOTED
MARCH 4, 2018 PROJECT DIRECTORYPROJECT OWNERTOWN OF MORRISVILLETOWN CONTACT:JOSH BAIRD, EI, [e-mail] ENVIRONMENTALJENNINGS ENVIRONMENTAL CONTACT:GREG JENNINGS, PHD, [e-mail] INDEXCOVER1.1EXISTING SITE CONDITIONS2.1E&SC PLAN3.1TYPICAL STREAM CROSS-SECTIONS4.1PLAN AND PROFILE5.1GRADING SECTIONS6.1RE-VEGETATION PLAN7.1STRUCTURE DETAILS8.1PROJECT SUMMARY9.1MORRISVILLE AQUATICS AND FITNESS CENTER (MAFC)STREAM STABILIZATION AND ENHANCEMENTUT CRABTREE CREEK - 1301 MORRISVILLE PKWY, MORRISVILLE, NC - WAKE COUNTY90% PLANS - PERMITTING AND REVIEWMARCH 4, 2018GDJ
7401
FIRST SUBMITAL PROJECT LOCATION90% PL
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SNCONC. WALK15"
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P15"RCPCONC. WALKCONC.
WALK60"RCPSW BASINTOP:327.01'INLET:326.31'FLOW LINE:320.71'SW BASINTOP:324.73'INLET:323.98'FLOW LINE:316.78'FES INV:315.97'BURIED SS CROSSINGELV NOT REPORTEDBY SURVEYORINV:308.46'TREE LINE (APPROX. DRIP LINE)20' DRAINAGE EASEMENT40' D
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T RB ZONE 1RB ZONE 2RB ZONE 1RB ZONE 2RB ZONE 1RB ZONE 2RB ZONE 1315'315'320'315'320'325'320'325'315'315'310'310'FLOWFLOWAPPROVED :
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PROJECT
NAME :
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DATE :
PROJECT #
AS NOTEDGDJ Feet01530SCALE: 1" = 15'90% PLANS - PERMITTING
MORRISVILLE, NC - WAKE CO.
1301 MORRISVILLE PKWY
MAFC - UT CRABTREE CREEK
EXIST. COND.2.1
MAFC
PLAN TYPE:SHEET NUMBER
REVISION #
GDJ
MARCH 4, 2018
7401
FIRST SUBMITAL EXISTING UTILITY EASEMENT BOUNDARYEXISTING SANITARY SEWER PIPEPROPOSED RIPARIAN VEGETATIONEXISTING WATER FORCE MAINEXISTING STORMWATER PIPEEXISTING PARCEL BOUNDARYEXISTING MAJOR CONTOUREXISTING MINOR CONTOURRIPARIAN BUFFER ZONE 1RIPARIAN BUFFER ZONE 2315314PLAN LEGENDEXISTING TREE LINEEXISTING UNDERGROUND ELECTRICTEMPORARY TREE PROTECTION FENCETEMPORARY SILT FENCELIMITS OF DISTURBANCESTANDARD CONSTRUCTION ENTRANCESTAGING AREASTORMWATER INLET PROTECTIONPROPOSED OFFSET BOULDER STEP STRUCTUREPROPOSED COIR LOG TOE PROTECTIONPROPOSED FLARED END SECTION (FES)PROPOSED MAJOR CONTOURPROPOSED MINOR CONTOUR315314PROPOSED CHANNEL BANKFULLPROPOSED CHANNEL CENTERLINEPROPOSED CONSTRUCTED RIFFLE90% PL
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RB ZONE 1RB ZONE 2RB ZONE 1RB ZONE 2RB ZONE 1RB ZONE 2RB ZONE 1315'315'320'315'320'325'320'325'315'315'310'310'INLET PROTECTIONSEE DETAIL (THIS SHEET).STAGING AREASTAGING AREA50 FT MIN.INLET PROTECTIONSEE DETAIL (THIS SHEET).TEMPORARY SILT FENCESEE DETAIL (THIS SHEET).TEMPORARY TREE PROTECTION FENCESEE DETAIL (THIS SHEET).STANDARD CONSTRUCTION ENTRANCESEE DETAIL (THIS SHEET).NEW CONSTRUCTION2"-3" STONE TO BE USED(SURGE STONE OR RAILROADBALLAST)BUT SUFFICIENT TO KEEPSEDIMENT ON SITEFABRIC UNDER STONESTANDARD CONSTRUCTION ENTRANCENOTES:1. PUT SILT FENCE OR TREE PROTECTION FENCE UP TO ENSURECONSTRUCTION ENTRANCE IS USED.2. IF CONSTRUCTION ON THE SITES ARE SUCH THAT THE MUD IS NOT REMOVED BY THE VEHICLE TRAVELING OVER THE STONE, THEN THE TIRES OF THE VEHICLES MUST BE WASHED BEFORE ENTERING THE PUBLIC ROAD.3. MAINTAIN GRAVEL PAD IN A CONDITION TO PREVENT MUD ORSEDIMENT FROM LEAVING CONSTRUCTION SITE. ENTRANCE WILLREQUIRE PERIODIC REMOVAL OF SEDIMENT-LADEN STONE ANDREPLACEMENT WITH FRESH STONE.EFFECTIVE: 01/31/08WAKECOUNTYNORTH CAROLINADEWATERINGCONCRETE BLOCK2:1 SLOPE, GRAVEL FILTERTEMPORARY SEDIMENTPOOLWIRE SCREENDEWATERING1' MINIMUM2' MAXIMUMSEDIMENT16"CONSTRUCTION SPECIFICATIONS1. LAY ONE BLOCK ON EACH SIDE OF THE STRUCTURE ON ITS SIDE IN THE BOTTOM ROW TO ALLOW POOL DRAINAGE. THE FOUNDATION SHOULD BE EXCAVATED AT LEAST 2 INCHES BELOW THE CREST OF THE STORM DRAIN. PLACE THE BOTTOM ROW OF BLOCKS AGAINST THE EDGE OF THE STORM DRAIN FOR LATERAL SUPPORT AND TO AVOID WASHOUTS WHEN OVERFLOW OCCURS. IF NEEDED, GIVE LATERAL SUPPORT TO SUBSEQUENT ROWS BY PLACING 2x4 WOOD STUDS THROUGH BLOCK OPENINGS.2. CAREFULLY FIT HARDWARE CLOTH OR COMPARABLE WIRE MESH WITH 1/2 INCH OPENINGS OVER ALL BLOCK OPENINGS TO HOLD GRAVEL IN PLACE.3. USE CLEAN GRAVEL, 3/4 TO 1/2 INCH IN DIAMETER, PLACED 2 INCHES BELOW THE TOP OF THE BLOCK ON A 2:1 SLOPE OR FLATTER AND SMOOTH IT TO AN EVEN GRADE. DOT #57 WASHED STONE IS RECOMMENDED.STANDARD BLOCK & GRAVEL DROP INLET PROTECTIONEFFECTIVE: 01/31/08WAKECOUNTYNORTH CAROLINAMAINTENANCE:INSPECT INLET PROTECTION AND REMOVE SEDIMENT AFTER EACHRAIN EVENT. GRAVEL SHOULD BEREPLACED AND REPAIRS MADE AS NEEDED.STANDARD TEMPORARY SILT FENCEANCHOR SKIRT AS DIRECTEDBY ENGINEER *6" MINIMUM COVEROVER SKIRT *GRADEFILL SLOPESILT FENCE FABRICWOVEN WIRE FABRICSTEEL POSTNOTE:1.USE SILT FENCE ONLY WHEN DRAINAGE AREA DOESNOT EXCEED 1/4 ACRE AND NEVER IN AREAS OFCONCENTRATED FLOW.2.REMOVE SEDIMENT DEPOSITED AS NEEDED TOPROVIDE STORAGE VOLUME FOR THE NEXT RAINAND TO REMOVE PRESSURE ON THE SILT FENCE.MINIMUM 10 GAUGELINE WIRESSILT FENCE FABRICINSTALLED TO SECONDWIRE FROM TOPMINIMUM 12-1/2 GAUGEINTERMEDIATE WIRESGRADEEFFECTIVE: 01/31/08WAKECOUNTYNORTH CAROLINADETAIL No.TREE PROTECTION FENCEDRIP LINE
EDGE OF DISTURBED AREAEFFECTIVE: 01/05/17APPROVED :
CHECK :
DESIGN :
PROJECT
NAME :
SCALE :
DATE :
PROJECT #
AS NOTEDGDJ Feet01530SCALE: 1" = 15'90% PLANS - PERMITTING
MORRISVILLE, NC - WAKE CO.
1301 MORRISVILLE PKWY
MAFC - UT CRABTREE CREEK
PLAN - PROFILE 3.1
MAFC
PLAN TYPE:SHEET NUMBER
REVISION #
GDJ
MARCH 4, 2018
7401
FIRST SUBMITAL NOTES AND SEQUENCE FOR E&SC PLANA.THE TOTAL ALLOWABLE LOD OF THE PROPOSED PROJECT IS 29,003 FT2(0.67 AC), WHICH INCLUDES 10,775 FT2 (0.25 AC) OF ZONE 1 RIPARIANBUFFER AND 3,856 FT2 (0.09 AC) OF ZONE 2 RIPARIAN BUFFER. THECONTRACTOR SHALL KNOW AND UNDERSTAND THE PROJECT EXTENTSAND LOD BEFORE STARTING CONSTRUCTION. THE CONTRACTOR ISENCOURAGED TO LIMIT DISTURBANCE TO VEGETATION AND GROUNDCOVER TO THE MAXIMUM EXTENT PRACTICAL WITHIN THE ALLOWABLE LOD.THE LOD AND E&SC FEATURES WILL BE MADE AVAILABLE TO CONTRACTORON THE PLANSHEETS AND AS LINEWORK IN *.DWG FORMAT.B.PRIOR TO BEGINNING CONSTRUCTION, THE CONTRACTOR SHALL CALL THETOWN OF MORRISVILLE INSPECTIONS DEPARTMENT (919.463.6180) TOSCHEDULE AN ON-SITE PRE-CONSTRUCTION MEETING.C.INSTALL ALL TEMPORARY EROSION AND SEDIMENT CONTROL MEASURESSHOWN ON THE PLANSHEETS AND DESCRIBED IN THE NOTES, DETAILS ANDPROJECT DOCUMENTS. LIMIT CLEARING AND LAND DISTURBING ACTIVITY TOTHE AREA NECESSARY TO INSTALL THE PERMITTED MEASURES.D.CALL THE TOWN OF MORRISVILLE INSPECTIONS DEPARTMENT (919.463.6180)FOR A SITE INSPECTION AFTER PERMITTED EROSION AND SEDIMENT CONTROLMEASURES HAVE BEEN INSTALLED. OBTAIN A CERTIFICATE OF COMPLIANCEAND BEGIN PERMITTED LAND DISTURBING ACTIVITY.E.OPERATE AND MAINTAIN PERMITTED E&SC MEASURES FOR THE DURATION OFTHE PROJECT. INCREASE MAINTENANCE FREQUENCY WHERE APPROVEDMEASURES FAIL TO PREVENT ACCELERATED EROSION, OFF-SITESEDIMENTATION, OR REPETITIVE NON-COMPLIANCE ISSUES.F.MODIFICATIONS TO THE PERMITTED E&SC PLAN SHALL BE APPROVED BY THETOWN OF MORRISVILLE INSPECTIONS DEPARTMENT (919.463.6180) PRIOR TOREMOVAL OR INSTALLATION.G.THE STANDARD CONSTRUCTION ENTRANCE OFF THE SMALL PARKINGAREA SHALL BE USED FOR ALL ACCESS TO THE SITE. ALL VEHICLES,TRUCKS AND EQUIPMENT ENTERING THE SITE SHALL USE THECONSTRUCTION ENTRANCE.H.TEMPORARY TREE PROTECTION FENCE SHALL BE INSTALLED AT THELIMITS OF DISTURBANCE ALONG THE WESTERN BOUNDARY OF THEPROPOSED GRADING AS SHOWN ON THE APPROVED E&SC PLAN.I.ALL CONSTRUCTION MATERIALS AND EQUIPMENT SHALL BE STORED AND /OR STAGED IN THE DESIGNATED AREA SHOWN ON THE APPROVED E&SCPLAN.J.THE ARMORED POOL AND OFFSET BOULDER STRUCTURE AT THEDOWNSTREAM END OF THE PROPOSED PROJECT (STA 3+24 FT) SHALL BEINSTALLED FIRST TO ACT AS A SETTLING BASIN AND ENERGY DISSIPATIONZONE FOR THE (AS NEEDED) TEMPORARY PUMP AROUND SYSTEM.K.A TEMPORARY PUMP AROUND SYSTEM MAY BE INSTALLED AND OPERATEDAS NEEDED IF WORK IS TO TAKE PLACE WITHIN THE CHANNEL AND DURINGACTIVE BASE FLOW CONDITIONS. TO DATE NO BASE FLOW HAS BEENOBSERVED IN THE CHANNEL. HYDROLOGY AND HYDRAULICS IN THISCHANNEL IS PRIMARILY STORMFLOW DRIVEN. NO WORK SHALL OCCUR INTHE CHANNEL DURING STORM FLOWS. THE PUMP SHALL BE ADEQUATELYSIZED TO HANDLE CURRENT BASE FLOW CONDITIONS IN THE CHANNEL.L.WHEN LAND DISTURBING AND CONSTRUCTION ACTIVITIES ARE COMPLETEAND ALL DISTURBED AREAS HAVE BEEN STABILIZED, CALLTHE TOWN OFMORRISVILLE INSPECTIONS DEPARTMENT (919.463.6180) FOR A SITEINSPECTIONS. IF APPROVED, REMOVE ALL PERMITTED E&SC MEASURES,AND STABILIZED ALL RESULTING BARE AREAS.M.ALL DISTURBED AREAS SHALL BE STABILIZED WITH TEMPORARY ANDPERMANENT SEEDING AND MULCHING ACCORDING TO THE VEGETATIONPLAN ON SHEET 7.1 AND WITHIN THE TIME FRAME DESCRIBED IN NOTE N ONTHIS SHEET.N.GROUND COVER SHALL BE PROVIDED AS FOLLOWS:N.1.FOR ALL AREAS OF MODERATE AND/OR STEEP SLOPES, PROVIDETEMPORARY GROUND COVER IF THE SLOPE HAS NOT BEEN DISTURBEDFOR A PERIOD OF FOURTEEN (14) DAYS.N.2.PROVIDE GROUND COVER SUFFICIENT TO RESTRAIN EROSION ON ANYPORTION OF THE SITE UPON WHICH FURTHER LAND-DISTURBING ACTIVITYIS NOT BEING UNDERTAKEN WITHIN FOURTEEN (14) CALENDAR DAYS OFTEMPORARILY OR PERMANENTLY SUSPENDING LAND DISTURBINGACTIVITY.N.3.ESTABLISH PERMANENT GROUND COVER SUFFICIENT TO RESTRAINEROSION WITHIN FOURTEEN (14) CALENDAR DAYS FOLLOWINGCOMPLETION OF CONSTRUCTION OR DEVELOPMENT AND/OR PRIOR TOFINAL INSPECTION.O.WHEN VEGETATION HAS BECOME ESTABLISHED, CALL FOR A FINAL SITEINSPECTION BY THE TOWN OF MORRISVILLE INSPECTIONS DEPARTMENT(919.463.6180) TO OBTAIN A CERTIFICATE OF COMPLETION.90% PL
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PROPOSED 700 GRAM COIREROSION CONTROL MATTINGSEE DETAILFLOODPLAINFLOODPLAINPROPOSED BKF WSE, QBKF = 16 CFS7.2'0.8'WIDTH VARIES PER PLANPROPOSED CENTERLINE ALIGNMENTPROPOSED GRADEFLOODPLAINPROPOSED BKF WSE10.1'WIDTH VARIES PER PLAN'TIE TO EXISTINGPER GRADING PLANPROPOSED CENTER LINE ALIGNMENT2.2'QBKF = 16 CFSWBKF = 7.2 FTABKF = 4.5 FT2DBKF= 0.6 FTDMAX = 0.8 FTW/D = 11.6ER= 3.5 - 7.5POINT BAR3.8 : 12
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1PROPOSED 700 GRAM COIREROSION CONTROL MATTINGSEE DETAILWPOOL = 10.1 FTAPOOL = 12.6 FT2DPOOL = 1.2 FTDMPOOL = 2.2 FTPBSLOPE= 3.8:12
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12 : 1TIE TO EXISTINGPER GRADING PLANPROPOSED RIFFLENOT TO SCALEUT CRABTREE CREEK CROSS-SECTIONPROPOSED POOLNOT TO SCALEUT CRABTREE CREEK CROSS-SECTIONAPPROVED :
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DESIGN :
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PROJECT #
NOT TO SCALEGDJ
90% PLANS - PERMITTING
MORRISVILLE, NC - WAKE CO.
1301 MORRISVILLE PKWY
MAFC - UT CRABTREE CREEK
TYP. X-SECTIONS 4.1
MAFC
PLAN TYPE:SHEET NUMBER
REVISION #
GDJ
MARCH 4, 2018
7401
FIRST SUBMITAL 90% PL
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RB ZONE 1RB ZONE 2RB ZONE 1RB ZONE 2RB ZONE 1RB ZONE 2RB ZONE 1315'315'320'315'320'325'320'325'315'315'310'310'ARMORED POOL AND CONFLUENCEU/S OF CULVERT WITHNC DOT CLASS B ROCKBEGIN PROPOSED ALIGNMENTSTA. = 2 + 28.43 FTELV. = 314.04 FTCONSTRUCTED RIFFLESEE DETAIL.3153153153153203203203253152:12:13:13:1OFFSET BOULDER STEPSEE DETAIL.COIR LOG TOE PROTECTIONSEE DETAIL.PROPOSED FESWITH BOULDER STEPINV ELV. = 315.00 FTARMORED OUTFALLAND 4FT WIDE CHANNELBOTTOM ELV. = 312.25 FTSEE DETAIL.3152:1END AT EXISTING CULVERTSTA. = 3+48.17 FTELV. = 308.46 FT0+501+001+502+002+503+00BP: 0+00.00PC: 0+10.73PT: 0+25.41PC: 0+34.08 PT: 0+47.67PC: 0+58.38PT: 0+71.10PC: 0+83.53 PT: 0+97.13PC: 1+16.24P
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PT: 2+52.67PC: 2+66.32PT: 2+84.13
PC: 2+96.51
PT: 3+15.17PC: 3+24.71PT: 3+35.35EP: 3+48.7118"

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%PROPOSED 18" RCPINV. ELV. = 316.78 FT3003013023033043053063073083093103113123133143153163173183193203213223233243253003013023033043053063073083093103113123133143153163173183193203213223233243250+000+250+500+751+001+251+501+752+002+252+502+753+003+253+50BEGIN PROPOSED ALIGNMENTSTA = 0+00.00 FTELV = 314.04 FTEXISTING GRADEPROPOSED BANKFULLEXISTING THALWEG1.4%2.5%STA = 0+10.73ELEV = 313.54STA = 0+25.41ELEV = 313.54STA = 0+25.41ELEV = 313.54STA = 0+34.08ELEV = 313.28STA = 0+47.67ELEV = 313.28STA = 0+47.67ELEV = 313.28STA = 0+58.38ELEV = 312.96STA = 0+71.10ELEV = 312.96STA = 0+71.10ELEV = 312.96STA = 0+83.53ELEV = 312.58STA = 0+97.12ELEV = 312.58STA = 0+97.12ELEV = 312.58
STA = 1+16.24
ELEV = 312.01
STA = 1+36.93
ELEV = 312.01
STA = 1+36.93
ELEV = 312.01
STA = 1+54.30
ELEV = 311.49
STA = 1+72.35
ELEV = 311.49
STA = 1+72.35
ELEV = 311.49
STA = 1+88.92
ELEV = 310.99
STA = 2+09.71
ELEV = 310.99
STA = 2+09.71
ELEV = 310.99
STA = 2+26.94
ELEV = 310.48
STA = 2+52.67
ELEV = 310.48
STA = 2+52.67
ELEV = 310.48
STA = 2+66.32
ELEV = 310.07
STA = 2+84.13
ELEV = 310.07
STA = 2+84.13
ELEV = 310.07
STA = 2+96.51
ELEV = 309.69
STA = 3+15.17
ELEV = 309.19
STA = 3+15.17
ELEV = 309.19
STA = 3+24.71
ELEV = 308.91
STA = 0+18.07ELEV = 312.16STA = 0+40.88ELEV = 311.90STA = 0+64.74ELEV = 311.58STA = 0+90.33ELEV = 311.20
STA = 1+26.59
ELEV = 310.63
STA = 1+63.33
ELEV = 310.11
STA = 1+99.32
ELEV = 309.61
STA = 2+39.80
ELEV = 309.10
STA = 2+75.23
ELEV = 308.69
STA = 3+05.84
ELEV = 307.82
STA = 3+37.04
ELEV = 307.08 3.0%3.0%3.0%3.1%3.0%3.0%3.0%3.0%3.0%3.1%2.9%APPROVED :
CHECK :
DESIGN :
PROJECT
NAME :
SCALE :
DATE :
PROJECT #
AS NOTEDGDJ Feet01530SCALE: 1" = 15'90% PLANS - PERMITTING
MORRISVILLE, NC - WAKE CO.
1301 MORRISVILLE PKWY
MAFC - UT CRABTREE CREEK
PLAN - PROFILE 5.1
MAFC
PLAN TYPE:SHEET NUMBER
REVISION #
GDJ
MARCH 4, 2018
7401
FIRST SUBMITAL 90% PL
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ELEVATION (FT)ELEVATION (FT)OFFSET FROM THALWEG (FT)UT CRABTREE CREEK STA. 0+75 FT3053063073083093103113123133143153163173183193203213223233243253263273283293303053063073083093103113123133143153163173183193203213223233243253263273283293300510152025303540455055606570750-5-10-15-20-25-30-35-40-45-50-55-60-65-70-75ELEVATION (FT)ELEVATION (FT)OFFSET FROM THALWEG (FT)UT CRABTREE CREEK STA. 1+80 FT3053063073083093103113123133143153163173183193203213223233243253263273283293303053063073083093103113123133143153163173183193203213223233243253263273283293300510152025303540455055606570750-5-10-15-20-25-30-35-40-45-50-55-60-65-70-75ELEVATION (FT)ELEVATION (FT)OFFSET FROM THALWEG (FT)UT CRABTREE CREEK STA. 2+61 FT3053063073083093103113123133143153163173183193203213223233243253263273283293303053063073083093103113123133143153163173183193203213223233243253263273283293300510152025303540455055606570750-5-10-15-20-25-30-35-40-45-50-55-60-65-70-75ELEVATION (FT)ELEVATION (FT)OFFSET FROM THALWEG (FT)UT CRABTREE CREEK STA. 3+20 FT3053063073083093103113123133143153163173183193203213223233243253263273283293303053063073083093103113123133143153163173183193203213223233243253263273283293300510152025303540455055606570750-5-10-15-20-25-30-35-40-45-50-55-60-65-70-75APPROVED :
CHECK :
DRAWN :
DESIGN :
PROJECT
NAME :
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PROJECT #
AS NOTEDGDJ
90% PLANS - PERMITTING
MORRISVILLE, NC - WAKE CO.
1301 MORRISVILLE PKWY
MAFC - UT CRABTREE CREEK
GRADING SCTN.6.1
MAFC
PLAN TYPE:SHEET NUMBER
REVISION #
GDJ
MARCH 4, 2018
7401
FIRST SUBMITAL 90% PL
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RB ZONE 1RB ZONE 2RB ZONE 1RB ZONE 2RB ZONE 1RB ZONE 2RB ZONE 1315'315'320'315'320'325'320'325'315'315'310'310'
APPROVED :
CHECK :
DESIGN :
PROJECT
NAME :
SCALE :
DATE :
PROJECT #
AS NOTEDGDJ Feet01530SCALE: 1" = 15'90% PLANS - PERMITTING
MORRISVILLE, NC - WAKE CO.
1301 MORRISVILLE PKWY
MAFC - UT CRABTREE CREEK
RE-VEGETATION 7.1
MAFC
PLAN TYPE:SHEET NUMBER
REVISION #
GDJ
MARCH 4, 2018
7401
FIRST SUBMITAL STREAMBANK AND RIPARIAN BUFFER RE-VEGETATION - 19,900 FT2 (0.45 AC)WOODY VEGETATIONSCIENTIFIC NAMECOMMON NAMESIZE (CAL)SPACING1QTYLiriodendron tulipiferaTULIP POPLARLIVE STK. 0.5 - 1.0"3 / 8 FT O.C.50Betula nigraRIVER BIRCHLIVE STK. 0.5 - 1.0"3 / 8 FT O.C.50Salix sericeaSILKY WILLOWLIVE STK. 0.5 - 1.0"3 / 8 FT O.C.50Cornus amomumSILKY DOGWOODLIVE STK. 0.5 - 1.0"3 / 8 FT O.C.50Callicarpa americanaBEAUTY BERRYBARE RT. / CTNR.8 FT O.C.50Xanthorhiza simplicissimaYELLOW ROOTBARE RT. / CTNR.8 FT O.C.50Lindera benzoinSPICE BUSHBARE RT. / CTNR.8 FT O.C.50Alnus serrulataTAG ALDERBARE RT. / CTNR.8 FT O.C.50PERMANENT SEEDINGSCIENTIFIC NAMECOMMON NAMETYPEAPP. RATEQTY------RIPARIAN SEED MIXSEED4 LBS / 1000 SF110 LBSElymus virginicusVIRGINIA WILD RYESEED20 %.------Agrostis perennansAUTUMN BENT GRASSSEED15 %------Pancicum virgatumSWITCHGRASSSEED15 %------Redbeckia hirtaBLACK-EYED SUSANSEED10 %------Coreopsis lanceolataLANCELEAF COREOPSISSEED10 %------Andropogon gerardiiBIG BLUESTEMSEED10 %------Juncus effususSOFT RUSHSEED10 %------Schizachyrium scopariumLITTLE BLUESTEMSEED5 %------Sorghastrum nutansINDIAN GRASSSEED5 %------TEMPORARY SEEDING, MULCHING AND SOIL PREPSCIENTIFIC NAMECOMMON NAMETYPEAPP. RATEQUANTITYSecale CerealeMILLETSEED5 LBS / 1000 SF135 LBS------GROUND AG. LIMESTONEPELLET45 LBS / 1000 SF1,200 LBS------10-10-10 FERTILIZERPELLET17 LBS / 1000 SF460 LBS------WHEAT STRAW MULCHSTRAW90 LBS / 1000 SF2,430 LBS.1STREAMBANK SPACING / FLOODPLAIN SPACINGGENERAL VEGETATION PLAN NOTESA.RE-VEGETATION OF THE STREAMBANKS, FLOODPLAINAND RIPARAIN BUFFER SHALL BE CONDUCTED ON THEAREAS SHOWN IN THE APPROVED RE-VEGETATIONPLAN.B.ALL OTHER AREAS DISTURBED WITHIN THEALLOWABLE LOD WILL SHALL BE STABILIZED BYAPPLYING TEMPORARY AND PERMANENT GROUNDCOVER.C.SOIL PREPARATION ELEMENTS, TEMPORARY ANDPERMANENT SEED AND GROUND COVER SHALL BESPREAD OVER ALL AREAS WITHIN THE LOD THAT AREDISTURBED DURING CONSTRUCTION.D.LIVE STAKES, TRANSPLANTS AND / OR CONTAINERIZEDPLANTS SHALL BE LOCATED WHERE SHOWN ON PLAN.E.ADJUSTMENTS TO THE VEGETATION PLAN SHALL BEMADE ONLY IF APPROVED BY THE PROJECT OWNER ORPROJECT ENGINEER.LIVE STAKES AND CUTTINGSF.CUTTINGS SHOULD BE INSTALLED THE SAME DAY THEYARE CUT. THE STAKE SHOULD BE ORIENTED WITH THEBUDS POINTED UP, AND THE BOTTOM SHOULD BE CUTAT AN ANGLE FOR EASY INSERTION INTO THE GROUND.G.ABOUT 34 OF THE LENGTH OF THE STAKE SHOULD BEBELOW GROUND AND ANGLED DOWNSTREAM. AN IRONBAR CAN BE USED TO MAKE A PILOT HOLE TO PREVENTBARK FROM BEING DAMAGED DURING INSTALLATION.TRANSPLANTS AND CONTAINER STOCKH.STOCK SHALL HAVE BEEN GROWN IN A CONTAINERLONG ENOUGH FOR THE ROOT SYSTEM TO HAVEDEVELOPED SUFFICIENTLY TO HOLD ITS SOILTOGETHER ONCE REMOVED FROM THE CONTAINER.I.CONTAINER PLANTS WILL NEED TO BE WATEREDREGULARLY AND PLACED IN SHADY CONDITIONS UNTILPLANTING OCCURS.CREATE PLANTING AREA FOR EACHPLANT AND EXCAVATE PIT.J.THE DIAMETER OF THE PLANTING HOLES (PITS) FOREACH PLANT SHOULD BE AT LEAST THREE TIMES THEDIAMETER OF THE ROOT MASS. SCARIFY THEPLANTING PIT PRIOR TO EACH PLANT INSTALLATION.K.SET PLANTS UPRIGHT IN THE CENTER OF THE PIT. THEBOTTOM OF THE ROOT MASS SHOULD BE RESTING ONUNDISTURBED SOIL.L.PLACE BACKFILL AROUND BASE AND SIDES OF ROOTMASS, AND WORK EACH LAYER TO SETTLE BACKFILLAND TO ELIMINATE VOIDS AND AIR POCKETS. WHEN PITIS APPROXIMATELY 23 FULL, WATER THOROUGHLYBEFORE PLACING REMAINDER OF THE BACKFILL.WATER AGAIN AFTER PLACING FINAL LAYER OFBACKFILL.90% PL
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A'AFLOWSTRUCTURE ELEVATION TABLESTRUCTURE STA.ELV. PT.FEATUREELV. (FT)STA. 5 + 36.19 FTELV. PT. 1STEP - TW309.96ELV. PT. 2STEP - 12 BKF310.36STA. 5 + 43.66 FTELV. PT. 3POOL - TW308.08STA. 5 + 63.95 FTELV. PT. 1STEP - TW309.04ELV. PT. 2STEP - 12 BKF309.54STA. 5 + 76.12 FTELV. PT. 3POOL - TW307.161.THE OFFSET BOULDER STEP IS A DESIGN FEATURE USED TO CONTROL GRADE IN HIGH IN GRADIENT REACHES ORAT CRITICAL JUNCTURES OF THE PROPOSED CHANNEL. THE OFFSET BOULDER STEP IS ALSO USED TO PROVIDEENERGY DISSIPATION, REDUCE NEAR BANK STRESS (NBS), AND CREATE A DIVERSITY OF AQUATIC HABITATTHROUGH SCOUR OF THE STREAM BED. THE BOULDER STEP IS COMPOSED OF A BOULDER SILL, WHICH IS A ROWOF BOULDERS SET AT AN ELEVATION PROVIDED IN THE PROPOSED PROFILE THAT SPANS PERPENDICULAR TO ANDSLIGHTLY ARCED ACROSS THE CHANNEL. THE BOULDER SILL EXTENDS APPROXIMATELY 1/3 OF THE CHANNELWIDTH IN THE CENTER OF THE CHANNEL. FROM THE EXTENTS OF THE SILL BOULDERS, TWO VANE ARMS EXTENDUP AND TOWARDS THE STREAM BANK, EVENTUALLY KEYING INTO THE BANK AT AN ELEVATION HIGHER THAN THESILL BOULDERS.2.ALL BOULDERS USED FOR THE OFFSET BOULDER STEP SHALL BE STRUCTURAL STONE, CUBICAL OR RECTANGULARIN SHAPE.3.DIMENSIONS AND SLOPES OF STRUCTURES DESCRIBED IN THE DETAIL MAY BE ADJUSTED BY DESIGN ENGINEER TOFIT CONDITIONS ONSITE.4.THE BOULDER SILL PERPENDICULAR TO FLOW WILL BE APPROXIMATELY 3 FT WIDE (OR ONE BOULDER LENGTH ANDTHE VANE ARMS WILL BE APPROXIMATELY 9 FT LONG (OUTSIDE ARM) AND 6 FT LONG (INSIDE).5.CONTRACTOR WILL BE REQUIRED TO FIT BOULDERS TIGHTLY.6.GAPS BETWEEN BOULDERS SHALL BE MINIMIZED BY FITTING BOULDERS TOGETHER AND PLUGGING WITHSTRUCTURE STONE CLASS A AND SELECT MATERIAL OR CHINKING STONE APPROVED BY DESIGN ENGINEER, ANDLINING WITH FILTER FABRIC.7.THERE SHALL BE NO DROP GREATER THAN 0.5 FT OVER A SINGLE STEP. BOULDERS SHALL BE 2 FT X 3 FT X 1.5 FT +/-0.5 FT.8.NON-WOVEN GEOTEXTILE SHALL BE PLACED ON THE UPSTREAM SIDE OF THE STRUCTURE TO PREVENT WASHOUTOF SEDIMENT THROUGH BOULDER GAPS. FILTER FABRIC SHALL EXTEND FROM THE BOTTOM OF THE FOOTERBOULDER TO THE FINISHED GRADE ELEVATION AND SHALL BE PLACED THE ENTIRE LENGTH OF THE STRUCTURE.9.STRUCTURE ELEVATIONS ARE INCLUDED IN THE TABLE BELOW.13 BKF13 BKF13 BKFWBKFSCOURPOOLOFFSET BOULDER STEPDETAILED PLANNOT TO SCALEOFFSET BOULDER STEPSECTION A - A'NOT TO SCALEOFFSET BOULDER STEPCROSS-SECTIONNOT TO SCALEKEY BOULDERS INTOSTREAMBANK @ 12 TO 23 BKF STAGEKEY BOULDERS INTOSTREAM BANK MINIMUM 5 FT.ARM SLOPE = 1 - 3%PROPOSED BANKFULL WSEOFFSET BOULDER STEPNOTESHIGH DENSITYLIVE STAKINGKEY BOULDERS INTOSTREAMBANK MIN. 5 FTELV. PT. 1ELV. PT. 2ELV. PT. 3BANKFULLPLACE BOULDERS INTOSTREAMBED A MINIMUM OF THEBOULDER DIAMETERFLOWSCOUR POOLBELOW STEPNON-WOVENGEOTEXTILEHEADERBOULDERFOOTERBOULDERPROPOSED BANKFULL WSESELECT BACKFILLSELECT BACKFILLBEHIND STRUCTURENON-WOVENGEOTEXTILEAPPROVED :
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NOT TO SCALEGDJ
90% PLANS - PERMITTING
MORRISVILLE, NC - WAKE CO.
1301 MORRISVILLE PKWY
MAFC - UT CRABTREE CREEK
BOULDER STEP 8.1
MAFC
PLAN TYPE:SHEET NUMBER
REVISION #
GDJ
MARCH 4, 2018
7401
FIRST SUBMITAL 90% PL
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ELEVATION POINT DESCRIPTIONPOINT POINT DESCRIPTIONP.C.POINT OF CURVATURE, TAIL OF RIFFLEM.P.MAXIMUM POOL DEPTHP.T.POINT OF TANGENCY, HEAD OF RIFFLE1.THE CONSTRUCTED RIFFLE IS A DESIGN FEATURE THAT INCORPORATES COARSEMATERIAL IN THE BED OF THE CHANNEL THAT WILL NOT BE TRANSPORTED UNDERBANKFULL OR FLOOD FLOW CONDITIONS. REPLACING THE NATIVE CHANNEL BEDMATERIAL WITH A LARGER DIAMETER AGGREGATES WITH CREATE A THRESHOLDCHANNEL WITH RIGID GRADE CONTROL. LARGER ROCK MATERIAL ALSO ENHANCESFLOW DIVERSITY AND TURBULENCE UNDER BASE FLOW CONDITIONS, WHICHPROMOTES AQUATIC HABITAT AND RE-AERATION OF STREAM FLOW BENEFITINGWATER QUALITY.2.ALL CONSTRUCTED RIFFLE MATERIAL SHALL BE QUARRIED STONE UNLESS NATIVEMATERIAL OF SIMILAR SIZE IS AVAILABLE ONSITE AND MEETS THE CONSTRUCTEDRIFFLE SIZE SPECIFICATIONS. THE ENGINEER MUST APPROVE THE USE OF ALLONSITE NATIVE MATERIAL.3.CONSTRUCTED RIFFLE MATERIAL SHALL CONSIST OF 60% NC DOT CLASS A ROCK,20% NC DOT CLASS B ROCK AND 20% ASTM #57 OR CRUSH AND RUN. THE ROCKSIZES SHALL BE BLENDED TOGETHER ONSITE WITH ADDITIONAL EARTH UNTIL WELLGRADED.4.CONSTRUCTED RIFFLES SHALL BE INSTALLED WITH A MINIMUM COARSE MATERIALDEPTH OF 0.75 FT.5.FOR INSTALLATION, THE CONTRACTOR SHALL OVER EXCAVATE THE RIFFLE LENGTHA MINIMUM OF 0.75 FT, INSTALL 700 GRAM COIR FIBER EROSION CONTROL MATTING,KEY MATTING INTO THE RIFFLE TRENCH AND BACKFILL WITH THE SPECIFIEDCOARSE RIFFLE MATERIAL TO THE ELEVATIONS SHOWN ON THE PROPOSEDPROFILE.6.CONSTRUCTED RIFFLE MATERIAL SHALL EXTEND A MINIMUM OF 2 FT U/S OF THE P.T.INTO THE GLIDE AND D/S TO THE P.C.7.P.T., P.C. AND M.P. ELEVATIONS ARE INCLUDED IN THE PROPOSED PROFILE, SHEET4.1.CONSTRUCTED RIFFLEDETAILED PROFILE - SECTION A - A'NOT TO SCALECONSTRUCTED RIFFLENOTESBASE FLOW WSECONSTRUCTED RIFFLEDETAILED XS - SECTION B - B'A B'BCONSTRUCTED RIFFLEDETAILED PLANFLOWP.C.EXTEND RIFFLE MATERIALINTO GLIDE MIN. 2 FTEXISTING EARTHOR FILL MATERIALRIFFLE SLOPEVARIES PER PROFILEEXTEND RIFFLE MATERIAL INTO GLIDE MIN. 2'POOLRIFFLEGLIDEKEY MATTING INTOCOARSE MATERIALA'P.T.P.C.P.T.CENTERLINETOE OF SLOPEBANKFULLGLIDE PROTECTIONOF NEXT RIFFLEPOOLPROPOSED BANKFULL WSEM.P.M.P.P.C.M.P.P.T.P.C.M.P.P.T.POOLRIFFLEPOOLNOT TO SCALECONSTRUCTED RIFFLE FROM P.T. TO P.C.RIFFLE MATERIALMINIMUM DEPTH = 0.75'SELECT RIFFLE MATERIAL60% NC DOT CLASS A20% NC DOT CLASS B20% ASTM #57EROSION CONTROL MATTINGCOIR 700 GRAMAPPROVED :
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NOT TO SCALEGDJ
90% PLANS - PERMITTING
MORRISVILLE, NC - WAKE CO.
1301 MORRISVILLE PKWY
MAFC - UT CRABTREE CREEK
CONST. RIFFLE 8.2
MAFC
PLAN TYPE:SHEET NUMBER
REVISION #
GDJ
MARCH 4, 2018
7401
FIRST SUBMITAL 90% PL
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A'ACOIR LOG TOE PROTECTIONINSTALLED ON OUTSIDEMEANDER BENDCENTERLINETOE OF SLOPEBANKFULLCONSTRUCTED RIFFLEPOOLCOIR LOG TOE PROTECTIONDETAILED SECTION A - A'NOT TO SCALECOIR LOG TOE PROTECTIONDETAILED PLANNOT TO SCALEBASE FLOW WSEEMBED COIR LOG INTO STREAMBANK SUCH THAT 12 OF THE COIRLOG IS SUBMERGED BELOWBASE FLOW WSEWRAP EROSION CONTROL MATTING OVER COIR LOGAND SECURE WITH WOODEN STAKEEROSION CONTROL MATTING1.THE COIR LOG TOE PROTECTION IS A DESIGN FEATURE THAT IS USED ON OUTSIDE MEANDER BENDS TOPROTECT THE STREAM BANK TOE FROM EROSION IMMIDIATELY AFTER CONSTRUCTION. THIS TOEPROTECTION MEASURE ALSO FACILITATES THE ESTABLISHMENT OF BANK VEGETATION TO PROMOTE LONGTERM ROOT STRUCTURE AND ROOT DENSITY. PLACE COIR ROLLS ALONG THE STREAM BANK AS DESIGNED.TIE THE ENDS OF ADJACENT COIR ROLLS TOGETHER WITH COIR TWINES. 6MM TWINE IS RECOMMENDED.USE EXTRA LOOPS OF COIR TWINE THROUGH THE OUTER NETTING OF ADJACENT COIR ROLLS.2.COIR LOGS USED FOR STREAMBANK TOE PROTECTION SHALL BE A MINIMUM OF 12" IN DIAMETER.3.EMBED COIR LOGS AT THE BANK TOE SUCH THAT 12 OF THE COIR LOG IS SUBMERGED BELOW THE BASEFLOW WSE.4.WRAP EROSION CONTROL MATTING OVER THE COIR LOG AND SECURE AT THE STREAM BANK TOE WITH AWOODEN STAKE AND NAIL.5.WOODEN STAKES (2"X4") WITH A 3-4" NAIL AT THE TOP IS RECOMMENDED FOR COIR ROLL INSTALLATION. INGENERAL, 36" LONG WEDGES ARE RECOMMENDED FOR 12" DIAMETER COIR ROLLS.6.BEND THE ENDS OF THE FIRST AND THE LAST COIR ROLL TOWARDS THE STREAM BANK AND TIE THEM INTOTHE BANK. THIS AVOIDS WATER GATHERING BEHIND THE COIR ROLLS AND PREVENTS PULLING THE COIRROLL OUT.7.ONCE THE COIR ROLLS ARE INSTALLED PROPERLY, PLANT SUITABLE NATIVE LIVESTAKES ANDCONTAINERIZED PLANTS ON AND AROUND COIR ROLLS WHERE WATER IS AVAILABLE FOR THE YOUNGPLANTS.COIR LOG TOE PROTECTIONNOTESCOIR LOG MIN. DIAMETER = 12"APPROVED :
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NOT TO SCALEGDJ
90% PLANS - PERMITTING
MORRISVILLE, NC - WAKE CO.
1301 MORRISVILLE PKWY
MAFC - UT CRABTREE CREEK
COIR LOG TOE 8.3
MAFC
PLAN TYPE:SHEET NUMBER
REVISION #
GDJ
MARCH 4, 2018
7401
FIRST SUBMITAL 90% PL
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18 IN RCP PIPEAA'NC DOT CLASS B ROCK APRONAS OUTFALL STABILIZATION8 OZ. NON WOVENGEOTEXTILE FABRIC1.0 FT15 FTFES8 OZ. NON WOVENGEOTEXTILE FABRICB B'PLACE CLASS B ROCK IN PARABOLIC SHAPEWITH THE LOW POINT AT THE CENTER OF THE ROCK APRONELV = 312.25 FT15.0 FTDETAILED SECTION A - A'DETAILED SECTION B - B'NOT TO SCALEDETAILED PLANNOT TO SCALEARMORED STORMWATER OUTFALLARMORED STORMWATER OUTFALLARMORED STORMWATER OUTFALLNOT TO SCALE10 FT18 IN RCP PIPEFESFESPROPOSED FESINV. ELV = 316.24 FTBOULDER STEP 1ELV = 316.00 FTBOULDER STEP 2INV. ELV = 314.50 FTPROPOSED FLOODPLAINELV = 313.00 FTELV. = 312.25 FTAPPROVED :
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NOT TO SCALEGDJ
90% PLANS - PERMITTING
MORRISVILLE, NC - WAKE CO.
1301 MORRISVILLE PKWY
MAFC - UT CRABTREE CREEK
SW OUTFALL 8.4
MAFC
PLAN TYPE:SHEET NUMBER
REVISION #
GDJ
MARCH 4, 2018
7401
FIRST SUBMITAL 90% PL
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3'BANKFULL2.5' (TYP)6" MIN. HORIZONTALOVERLAP2.5'(TYP)2.5'(TYP)2'(TYP)2'(TYP)6" MIN. VERTICALOVERLAPAA'700 GRAM COIR FIBER MATTINGFROM TOE OF CHANNEL TO3 FT BEYOND BANKFULLBANKFULLCHANNEL TOE OF SLOPE700 GRAM COIRMATTING2' LONG 2" x 2" WOOD STAKESw/ 3" GALVANIZED ROOFING NAILAT THE TOP TO SECURE MATTING6" MIN. HORIZONTALOVERLAPEROSION CONTROL MATTINGDETAILED STAKING PLANNOT TO SCALEEROSION CONTROL MATTINGDETAILED PLANNOT TO SCALE1.EROSION CONTROL MATTING IS USED TO PROTECT RECENTLY CONSTRUCTEDSTREAM BANKS FROM EROSION. THE MATTING WILL REMAIN INTACT WHILE THEBANK AND RIPARIAN VEGETATION MATURES, PROVIDING CRITICAL BANKPROTECTION.2.BEFORE INSTALLING COIR FIBER BLANKET, RAKE SOIL LEVEL AND ADD SEED,FERTILIZER, LIME AND MULCH.3.700 GRAM COIR FIBER EROSION CONTROL MATTING SHALL BE PLACED ALONGTHE LENGTH OF THE NEW CHANNEL FROM THE TOE OF SLOPE OUT TO AMINIMUM OF 3 FT BEYOND THE BANKFULL ELEVATION.4.SECURE COIR MATTING IN PLACE BY STAKING AND OVERLAPPING AT THESEEMS WITH A SHINGLE-TYPE METHOD SUCH THAT THE OVERLAPPING PIECE ISIN THE SAME DIRECTION AND AS THE STREAM FLOW. ADDITIONAL STAKINGSHALL BE APPLIED BY THE CONTRACTOR AT NO ADDITIONAL COST IF THEMATTING SEPARATES FROM THE SOIL MORE THAN ONE INCH UNDER AREASONABLE PULL.700 GRAM COIR FIBER MATTINGSUPPLEMENT WOODEN STAKESWITH 12" ECO-STAKES2' LONG 2" x 2" WOOD STAKESw/ 3" GALVANIZED ROOFING NAILAT THE TOP TO SECURE MATTINGEROSION CONTROL MATTINGDETAILED CROSS-SECTION A - A'NOT TO SCALEEROSION CONTROL MATTINGNOTESKEY INTO EARTHMIN 0.5'APPROVED :
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NOT TO SCALEGDJ
90% PLANS - PERMITTING
MORRISVILLE, NC - WAKE CO.
1301 MORRISVILLE PKWY
MAFC - UT CRABTREE CREEK
COIR MATTING 8.5
MAFC
PLAN TYPE:SHEET NUMBER
REVISION #
GDJ
MARCH 4, 2018
7401
FIRST SUBMITAL 90% PL
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AS NOTEDGDJ PROJECT OVERVIEWAN EXISTING 555 LF REACH OF UT CRABTREE CREEK IS LOCATED WEST OF THE MORRISVILLE AQUATICS AND FITNESS CENTER(MAFC) AT 1301 MORRISVILLE PARKWAY, MORRISVILLE, NC. THE STREAM FLOWS NORTHWARD ALONG THE PARCEL BOUNDARY D/STO A CULVERT UNDER MORRISVILLE PARKWAY. THIS REACH OF UT CRABTREE CREEK IS MODERATELY STABLE (REACH 1) TO VERYUNSTABLE (REACH 2). JENNINGS ENVIRONMENTAL HAS WORKED WITH THE TOWN OF MORRISVILLE TO CONDUCT A FEASIBILITYSTUDY THAT EVALUATED PROJECT OBJECTIVES AND PROPOSED ALTERNATIVES USING MULTIPLE CRITERIA DECISION ANALYSIS(MCDA). BASED ON FINDINGS FROM THE FEASIBILITY STUDY, JENNINGS ENVIRONMENTAL HAS MOVED FORWARD TO DEVELOP ARIPARIAN BUFFER ENHANCEMENT PLAN AND STREAM STABILIZATION / REALIGNMENT PLAN. THIS 60% PLAN SET HAS BEENPRODUCED WITH PROPOSED LINEWORK, DETAILED GRADING, IN-STREAM STRUCTURE LOCATIONS, STORMWATER OUTFALLLOCATIONS, AND A FLOODPLAIN AND RIPARIAN VEGETATION PLANTING PLAN. THE PLAN SET INCLUDES DETAILS FOR STRUCTURESAND PLANTING. A CAD FILE WITH THE PROPOSED GRADING SURFACE AND LINEWORK HAS ALSO BEEN PRODUCED FORCONSTRUCTION.EXISTING CONDITIONSTHE WATERSHED DRAINAGE AREA FOR THE STREAM EXITING THE MAFC PARCEL AT THE CULVERT UNDER MORRISVILLE PARKWAY ISAPPROXIMATELY 56 ACRES (0.1 SQUARE MILES) WITH IMPERVIOUS SURFACE COVERING ABOUT 25 PERCENT OF THE LAND AREA.BASED ON MORPHOLOGICAL CONDITIONS AND SITE CONSTRAINTS, THE 555 LF STREAM WAS SEPARATED INTO TWO REACHES.REACH 1 BEGINS AT THE SOUTHERN PARCEL BOUNDARY AND CONTINUES D/S 228 LF (STA 0 + 00 FT TO 2 + 28 FT) ENDING ABOVE ANEXISTING HEADCUT. REACH 2 BEGINS AT STA 2 + 28 FT ABOVE THE HEADCUT AND EXTENDS 358 LF TO THE CULVERT UNDERMORRISVILLE PARKWAY (STA 5 + 87 FT). REACH 1 HAS MODERATELY STABLE MORPHOLOGY WITH MINOR INCISION AND UNDERCUTBANKS RESULTING IN SOME SECTIONS OF MODERATE STREAMBANK EROSION RATES. REACH 2 IS UNSTABLE WITH SEVERE INCISIONAND HIGH BANK EROSION RATES THROUGHOUT MOST OF THE REACH. IN PARTICULAR, THE LEFT BANK FACING DOWNSTREAM ISSTEADILY MIGRATING LATERALLY DUE TO BANK EROSION ONTO PRIVATE PROPERTY TO THE WEST OF THE MACF FACILITY.PROJECT OBJECTIVESPROJECT OBJECTIVES WERE DEVELOPED FROM OUTCOMES OF THE FEASIBILITY STUDY AND EXISTING CONDITIONSASSESSMENT. DETAILED PROJECT OBJECTIVES ARE DESCRIBED BELOW:OBJECTIVE #1: ARREST BANK EROSION AND LATERAL MIGRATION OF THE CHANNEL ONTO PRIVATE PARCELS.OBJECTIVE #2: STABILIZE HEADCUTTING U/S OF EXISTING STORMWATER OUTFALL.OBJECTIVE #3: CONTROL INVASIVE SPECIES AND ENHANCE THE RIPARIAN BUFFER OF REACH 1.OBJECTIVE #4: PULL REACH 2 EAST, OFF PRIVATE PROPERTY AND ONTO THE MAFC PARCEL WHERE FEASIBLE.OBJECTIVE #5: CONSTRUCT REACH 2 AS A MEANDERING CHANNEL WITH THRESHOLD RIFFLES AND FLOODPLAINCONNECTION.OBJECTIVE #6: RELOCATE EXISTING STORMWATER OUTFALL TO AN ARMORED PLUNGE POOL JUST U/S OF THEMORRISVILLE PARKWAY CULVERT.OBJECTIVE #7: PROVIDE MAFC PATRON ACCESS AND ENVIRONMENTAL EDUCATION OPPORTUNITIES.PROJECT CONSTRAINTSTHE PROPOSED STABILIZATION AND REALIGNMENT PROJECT IS CONSTRAINED VERTICALLY AND HORIZONTALLY BY UTILITIES,PROPERTY BOUNDARIES, EXISTING INFRASTRUCTURE AND SITE FEATURES. DETAILED PROJECT CONSTRAINTS ARE DESCRIBEDBELOW:1.PROPERTY BOUNDARIES: THE EXTREME UPSTREAM SECTION OF REACH 1 IS LOCATED ON PRIVATE PROPERTY. THIS SECTION ISSTABLE AND DOES NOT AFFECT POTENTIAL STABILIZATION PROJECTS ON THE MACF PROPERTY. SOME OF REACH 2 ISENCROACHING ON PRIVATE PROPERTY TO THE WEST OF THE MACF. LANDOWNER COOPERATION WILL BE REQUIRED TO REALIGNTHE STREAM ONTO MACF PROPERTY AND ESTABLISH A HEALTHY RIPARIAN BUFFER FOR LONG-TERM STABILITY.2.EXISTING SITE FEATURES AND INFRASTRUCTURE: A PARKING AREA FOR THE MAFC FACILITY ENCROACHES ON THE EXISTINGSTREAM AND RIPARIAN BUFFER, REMOVAL OF THE PARKING AREA IS POSSIBLE BUT COSTLY. THERE IS A CULVERT UNDERMORRISVILLE PARKWAY AT THE D/S END OF REACH 2. THIS IS A VERTICAL ELEVATION CONTROL THAT CANNOT BE CHANGED INTHE PROPOSED PLAN.3.UTILITIES: AN EXISTING STORMWATER OUTFALL IS PRESENT AT STA. 3 + 50 FT. A SEWER LINE CROSSES UNDER THE STREAMBEDAT STA. 5 + 75 FT, MEANING THAT STABILIZATION EFFORTS MUST NOT LOWER THE ELEVATION OF THE EXISTING STREAMBED INTHIS AREA.PROJECT DESIGN SUMMARYTHE PROPOSED PLAN FOR REACH 1 INCLUDES INVASIVE SPECIES CONTROL AND ENHANCEMENT OF THE RIPARIAN BUFFER OF 228 LFTHROUGH THE PHYSICAL REMOVAL OF THE INVASIVE SHRUBS, TREES AND GROUNDCOVER. THE RIPARIAN BUFFER OF REACH 1 WILLBE ENHANCED WITH THROUGH LIVESTAKING AND PLANTING OF CONTAINERIZED PLANTS. THE PROPOSED STABILIZATION ANDREALIGNMENT PLAN OF REACH 2 WAS DEVELOPED USING AN ANALOG AND ANALYTICAL DESIGN APPROACH. REFERENCE REACHDATA FROM SAL'S BRANCH IN UMSTEAD PARK WAS USED A DESIGN TEMPLATE FOR THE PROPOSED PLAN AND PROFILEMORPHOLOGY. 358 LF OF REACH 2 WILL BE REALIGNED AS A ROSGEN E4 CHANNEL WITH A 0.0156 FT/FT WATER SURFACE SLOPE ANDRELATIVELY LOW SINUOSITY OF 1.14 FT/FT. PROPOSED CHANNEL DIMENSIONS WERE DEVELOPED FROM EXISTING CHANNELDIMENSIONS AND HYDRAULIC CALCULATIONS. SPECIFIC DIMENSION, PLANFORM AND PROFILE DESIGN PARAMETERS ARE INCLUDEDIN THE MORPHOLOGY SUMMARY TABLE. THE REACH 2 DESIGN USES CONSTRUCTED RIFFLES TO RESIST IN-CHANNEL VELOCITIESAND SHEAR STRESSES PREVENTING DOWNCUTTING AND CHANNEL DEGRADATION. TWO OFFSET BOULDER STEPS ARE ALSOINCLUDED IN THE DESIGN TO CONTROL GRADE AND TURN STREAM FLOWS AT THE D/S END OF THE PROJECT NEAR THE EXISTINGCULVERT. COIR LOG TOE PROTECTION WILL BE USED ON OUTSIDE MEANDER BENDS WHERE THE EXISTING CHANNEL HAS BEENFILLED.90% PLANS - PERMITTING
MORRISVILLE, NC - WAKE CO.
1301 MORRISVILLE PKWY
MAFC - UT CRABTREE CREEK
SUMMARY 9.1
MAFC
PLAN TYPE:SHEET NUMBER
REVISION #
GDJ
MARCH 4, 2018
7401
FIRST SUBMITAL 90% PL
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