HomeMy WebLinkAboutpg121:111awmMAN I MA I' • `• �.
1. IF NECESSARY, SLOPES, WHICH EXCEED EIGHT (8) VERTICAL FEET SHOULD BE
STABILIZED WITH SYNTHETIC OR VEGETATIVE MATS, IN ADDITION TO
HYDROSEEDING. IT MAY BE NECESSARY TO INSTALL TEMPORARY SLOPE
DRAINS DURING CONSTRUCTION. TEMPORARY BERMS MAY BE NEEDED UNTIL
THE SLOPE IS BROUGHT TO GRADE.
2. STABILIZATION MEASURES INCLUDING TEMPORARY GRASSING SHALL BE
INITIATED AS SOON AS PRACTICABLE IN PORTIONS OF THE SITE WHERE
CONSTRUCTION ACTIVITIES HAVE TEMPORARILY OR PERMANENTLY CEASED PER
THE CHART ON SHEET C -13.
3. ALL SEDIMENT AND EROSION CONTROL DEVICES SHALL BE INSPECTED EVERY
SEVEN (7) DAYS. IF SITE INSPECTIONS IDENTIFY BMPS THAT ARE DAMAGED
OR ARE NOT OPERATING EFFECTIVELY, MAINTENANCE MUST BE PERFORMED
AS SOON AS PRACTICAL OR AS REASONABLY POSSIBLE AND BEFORE THE
NEXT STORM EVENT WHENEVER PRACTICABLE.
4. PROVIDE SILT FENCE AND /OR OTHER CONTROL DEVICES, AS MAY BE
REQUIRED, TO CONTROL SOIL EROSION DURING UTILITY CONSTRUCTION. ALL
DISTURBED AREAS SHALL BE CLEANED, GRADED, AND STABILIZED WITH
GRASSING IMMEDIATELY AFTER THE UTILITY INSTALLATION. FILL, COVER, AND
TEMPORARY SEEDING AT THE END OF EACH DAY ARE RECOMMENDED. IF
WATER IS ENCOUNTERED WHILE TRENCHING, THE WATER SHOULD BE FILTERED
TO REMOVE ANY SEDIMENTS BEFORE BEING PUMPED BACK INTO ANY WATERS
OF THE STATE.
5. ALL EROSION CONTROL DEVICES SHALL BE PROPERLY MAINTAINED DURING
ALL PHASES OF CONSTRUCTION UNTIL THE COMPLETION OF ALL
CONSTRUCTION ACTIVITIES AND ALL DISTURBED AREAS HAVE BEEN
STABILIZED. ADDITIONAL CONTROL DEVICES MAY BE REQUIRED DURING
CONSTRUCTION IN ORDER TO CONTROL EROSION AND /OR OFFSITE
SEDIMENTATION. ALL TEMPORARY CONTROL DEVICES SHALL BE REMOVED
ONCE CONSTRUCTION IS COMPLETE AND THE SITE IS STABILIZED.
6. THE CONTRACTOR MUST TAKE NECESSARY ACTION TO MINIMIZE THE TRACKING
OF MUD ONTO PAVED ROADWAY(S) FROM CONSTRUCTION AREAS AND THE
GENERATION OF DUST, THE CONTRACTOR SHALL DAILY REMOVE MUD /SOIL
FROM PAVEMENT, AS MAY BE REQUIRED.
7. TEMPORARY DIVERSION BERMS AND /OR DITCHES WILL BE PROVIDED AS
NEEDED DURING CONSTRUCTION TO PROTECT WORK AREAS FROM UPSLOPE
RUNOFF AND /OR TO DIVERT SEDIMENT -LADEN WATER TO APPROPRIATE
TRAPS OR STABLE OUTLETS.
S. LITTER, CONSTRUCTION DEBRIS, OILS, FUELS, AND BUILDING PRODUCTS WITH
SIGNIFICANT POTENTIAL FOR IMPACT (SUCH AS STOCKPILES OF FRESHLY
TREATED LUMBER) AND CONSTRUCTION CHEMICALS THAT COULD BE EXPOSED
TO STORM WATER MUST BE PREVENTED FROM BECOMING A POLLUTANT
SOURCE IN STORM WATER DISCHARGES.
9. INLET PROTECTION IS TO BE PROVIDED AT ALL EXISTING INLETS THAT
RECEIVE FLOW FROM THE DISTURBED AREAS.
10. CONTRACTOR SHALL PROVIDE ONE STABILIZED CONSTRUCTION ENTRANCE AT
ALL TIMES DURING CONSTRUCTION. LOCATION SHALL BE FIELD LOCATED AND
COORDINATED WITH THE OWNER.
CONSTRUCTION SEQUENCE
MAINTENANCE REQUIREMENTS
1.
RESEED AND MULCH SEEDED AREAS WHERE SEEDLING EMERGENCE IS POOR, OR WHERE EROSION OCCURS, AS
1.
NOTIFY NCDENR, AND HARNETT COUNTY, PRIOR TO BEGINNING CONSTRUCTION AND SCHEDULE A
SOON AS POSSIBLE. DO NOT MOW. PROTECT FROM TRAFFIC AS MUCH AS POSSIBLE.
PRECONSTRUCTION MEETING ON SITE BEFORE WORK BEGINS,
L49
ProJect: Anderson Crook
:'.
BEGIN MOWING AS SOON AS THE GRASS IS 50% HIGHER THAN THE DESIRED HEIGHT. FOR EXAMPLE, MOW
2.
PROVIDE TREE PROTECTION FENCING PRIOR TO ANY CLEARING, GRADING OR CONSTRUCTION
o.a6
---j�,
TALL FESCUE BACK TO 3" WHEN TURF REACHES 4J° HEIGHT. THE FREQUENCY OF MOWING IS GOVERNED BY
ACTIVITY AROUND PROTECTED TREES OR GROVES OF TREES. NO CONSTRUCTION WORKERS, TOOLS,
THE AMOUNT OF GROWTH. MOW WHEN LESS THAN 50% OF THE TOTAL LEAF SURFACE IS REMOVED.
MATERIALS, OR VEHICLES ARE PERMITTED WITHIN THE TREE PROTECTION FENCING.
CONTINUE MAINTENANCE THROUGHOUT THE FIRST GROWING SEASON OR UNTIL TURF IS ACCEPTED BY THE
3.
CONSTRUCT TEMPORARY CONSTRUCTION ENTRANCE.
HARNETT COUNTY.
4.
PROVIDE EROSION CONTROL MEASURES INCLUDING THOSE AT STAGING AREA(S).
3.
RIPRAP SHOULD BE INSPECTED PERIODICALLY FOR SCOUR OR DISLODGED STONES. CONTROL OF WEED AND
BRUSH GROWTH MAY BE NEEDED IN SOME LOCATIONS.
5.
CLEAR AND REMOVE FROM SITE ALL TREES, ROOTS, ROOT MAT, ETC. FROM THE AREA WITHIN
n.
INSPECT PERMANENT DIVERSIONS AFTER EVERY RAINFALL DURING THE CONSTRUCTION OPERATION,
DESIGNATED CLEARING LIMITS.
IMMEDIATELY REMOVE ANY OBSTRUCTIONS FROM THE FLOW AREA, AND REPAIR THE DIVERSION RIDGE. CHECK
OUTLETS AND MAKE TIMELY REPAIRS AS NEEDED. MAINTAIN THE VEGETATION IN A VIGOROUS, HEALTHY
6.
PROVIDE SEDIMENT AND EROSION /TURBIDITY MEASURES AS SHOWN, AS CONSTRUCTION
CONDITION AT ALL TIMES.
PROGRESSES. AT THE END OF EACH DAY, EROSION CONTROL DEVICES MUST BE IN PLACE, AS
DEPICTED ON THE PLANS, UP TO THE CURRENT END OF DISTURBED AREA.
INSPECT CHANNELS AT REGULAR INTERVALS AS WELL AS AFTER MAJOR RAINS AND MAKE REPAIRS
DEHNR
PROMPTLY. GIVE SPECIAL ATTENTION TO THE OUTLET AND INLET SECTIONS OTHER POINTS WHERE
7.
PERFORM MASS GRADING.
Channel
CONCENTRATED FLOW ENTERS. SCOUR HOLES OR BANK FAILURES. MAKE REPAIRS IMMEDIATELY. MAINTAIN
Chan Bot
Side
Side Slope
ALL VEGETATION ADJACENT TO THE CHANNEL IN A HEALTHY, VIGOROUS CONDITION TO PROTECT THE AREA
8.
INSTALL STORM DRAINAGE SYSTEM AS SHOWN ON PLANS AND PROTECT INLETS UNTIL SITE IS
Hydraulic
FROM EROSION AND SCOUR DURING OUT -OF -BANK FLOW.
Channel
STABILIZED.
talc:
9. PLACE GRAVEL ENTRANCE DRIVE AND PARKING AREA AS ILLUSTRATED ON PLANS. CONSTRUCT
PAD FOR RESTROOM BUILDING AND ERECT PICNIC SHELTER, PLACE CONCRETE WALKS AND GRANITE
SCREENING TRAILS.
10. PERFORM FINE GRADING.
11. IMMEDIATELY UPON COMPLETION OF WORK, LEVEL OUT, SEED, AND MULCH ALL DISTURBED AREAS
PER CHART ON SHEET C -13. SEED AREAS READY FOR PERMANENT STABILIZATION.
12. CONTINUE TO MAINTAIN PERMANENT AND TEMPORARY EROSION CONTROL MEASURES DURING
GRADING AND AFTER GRADING HAS BEEN COMPLETED UNTIL FINAL INSPECTION AND APPROVAL BY
NCDENR.
13. CLEAN AND RESTORE TO PRE - CONSTRUCTION CONDITIONS ANY AREAS OUTSIDE THE PROJECT
LIMITS THAT MAY BE DAMAGED DUE TO THE FAILURE OF THE EROSION CONTROL MEASURES.
14. WATER, FERTILIZE, MOW AND MAINTAIN SEEDED AREAS UNTIL FINAL APPROVAL BY NCDENR.
15. REMOVE THE REMAINING TEMPORARY EROSION CONTROL MEASURES UPON APPROVAL BY NCDENR.
Triangular Swale Performance
L49
ProJect: Anderson Crook
Mann ings Equation, �= (Ak-
o.a6
---j�,
p.5
Designer: BR
Y2
Date: 1 -22 -20113
DEHNR
Channel
Design
Chan Bot
Side
Side Slope
Design
Chan
Wetted
Hydraulic
Mann.
Channel
Q
talc:
Shear
Tamp
Perm.
Location
Flow cfs
Width
Sloe
Len th
be th
Area
Perim. Poe
Radius
n"
Slue
Allow
De th
Stress
Liner
Liner
Tem Diversion Ditch A
9.9
0.00
3.5
4.3
0.71
2
9
0.2
0.030
0:057
7.3
0.7
P2,9
2.5
Nag SC 250
None
Temp Diversion Ditch B
7:3
0.00
3:5
4.3
0.69
2
9
0.2
0.030
0.036
5.3
0.7
1.6
Nag SC 150
None
Tel Diversion Ditch C
2.7
0,00
3.5
3.9
0.52
1
8
0.1
0.030
0.022
1`.7
0.5
0.7
Nag S75
None
em pi+7ersion pitch p
2.2
0:00
3:b
3:8
0.45
1
8
0.1
0,030
0.032
1.3
0.5
0.9'
Nag 575
Nona
Tem iversion Ditch E
11.2
0:00
3:5
4.5
0.79
2
9
0:2
0:030
8.4
0.8'
5.2
1.9
Nag SC 150
one
Temp Diversion Ditch
1.0
0.00
3.5
3.7
0.30
0
7
0.0
0;030
J.039
9
0.5
0:3,
3:3
1.1
Nag S75
None
Tem piversion Ditch U
11.5
0.00
3.5
4.4
0.74
2
9
0.2
0:030
0
8.5
0:7
6.1
2.8
Nag SC250
None
Tem Diversion Ditch H
11.8 0.00 3.5
4,5
0.80 2 9 0.2 0.030
O :043
9.1
0.8
5;4
21
Nag 0125
None
TerrtporaryLiners
ToV uz
AUW2.v ,ss-
Max.
�
Allow.DesignYfot Vegeta #iueChannels
Shear SfYUSS, 7. =Jt5
A1towSLeaStress
ldww tbw in
ChannelSto a
Soil
GrassLining
Pemxssib @V (e/s )
0.i
NAG
3C 350 ono
d -S%
SendelSlli
BeraAUs
59
T = shear stress in lb/sq. ft.
Tack dMulch 0,35
luteNet 0.45
NAG
"1 195
Tall Fes
4..5
'
y = unit weight of water, 62.4 ib/cu. ft.
Strawwl Net 115
NAG
NAG
sis 1:93
Si50 1.P3
KYB-legrase
Grass- legurmnia
45
35 :
d =low depth ''inft.
SytheticMat 2.00
1.25
NAG
nuo 2.00
MaxPertrassibbVdocitiesibrUnprotectedsoilsinEx
Material
.Chinnel
Max- PennissibtiVdacityws)
CIayA4xes
Bermuda
s = channel slope In 1I.A.
C1assA
Cana 2.00
NAC.
NAG
t:tas azs
scow sou
FineSand(nonco)
ffl&
2.5
Tall Fescue
KYBluegrass
53
53
55
claesl 3a0
xac
csa a.ao
San d Loaminon cot lid)
am (no
25:
3.0
Grass ggusem x
4.5
Class 11 4:50
Lotlldl)
Ordia
6rdinaryFi mLoam
3.5
5 -IOolo
Sap is /Sill
Be mtda
Tall Fescue.
4.5
4:0
Firiepravei
S.0
-5.0
KYBiuegrass
4.0
Notes:
Graded,Siltt Cobb es;
Gxaded,Silt toCobbles
5:0
Ciag Mixes
Grass- legumetnix
Benroada
310
53
Side slope honz lvert
KYBiu grass
s o
Needsinput
Graasaegnme rix
ss
'
pth and Velocity calculated
using
Try and Triangular Swalespreadshe�
Permanent Erasion Control Mattin g ( PECM) may be used as a temperar
ppizoidal
and permanent liner
For unvegetated channels, PECM has an allowable shear stress of 8 If /ft and an allowable flow rate of 20IV$
G 1 IUN UH U.Tt Uh 1 nt GUN I CN t A UP
41292013 dwg - January 29 2013 - Joel Moulin
b. INSPECT TEMPORARY SEDIMENT TRAPS AT LEAST WEEKLY AND AFTER EACH SIGNIFICANT (1/2 INCH OR
GREATER) RAINFALL EVENT AND REPAIR IMMEDIATELY. REMOVE SEDIMENT, AND RESTORE THE TRAP TO ITS
ORIGINAL DIMENSIONS WHEN THE SEDIMENT HAS ACCUMULATED TO ONE -HALF THE DESIGN DEPTH OF THE
TRAP. PLACE THE SEDIMENT THAT IS REMOVED IN THE DESIGNATED DISPOSAL AREA, AND REPLACE THE
PART OF THE GRAVEL FACING THAT IS IMPAIRED BY SEDIMENT.
CHECK STRUCTURES FOR DAMAGE FROM EROSION OR PIPING. PERIODICALLY CHECK THE DEPTH OF THE
SPILLWAYS TO ENSURE THEY ARE MINIMUM OF 1.5 FEET BELOW THE LOW POINT OF THE EMBANKMENT.
IMMEDIATELY FILL ANY SETTLEMENT OF THE EMBANKMENT TO SLIGHTLY ABOVE DESIGN GRADE. ANY RIPRAP
DISPLACED FROM THE SPILLWAY MUST BE REPLACED IMMEDIATELY.
AFTER ALL SEDIMENT- PRODUCING AREAS HAVE BEEN PERMANENTLY STABILIZED, REMOVE THE STRUCTURES
AND ALL UNSTABLE SEDIMENT. SMOOTH THE AREA TO BLEND WITH THE ADJOINING AREAS, AND STABILIZE
PROPERLY.
INSPECT BAFFLES AT LEAST ONCE A WEEK AND AFTER EACH RAINFALL. MAKE ANY REQUIRED REPAIRS
IMMEDIATELY. BE SURE TO MAINTAIN ACCESS TO THE BAFFLES. SHOULD THE FABRIC OF A BAFFLES
COLLAPSE, TEAR, DECOMPOSE, OR BECOME INEFFECTIVE, REPLACE IT PROMPTLY. REMOVE SEDIMENT
DEPOSITS WHEN IT REACHES HALF FULL TO PROVIDE ADEQUATE STORAGE VOLUME FOR THE NEXT RAIN AND
TO REDUCE PRESSURE ON THE BAFFLES. TAKE CARE TO AVOID DAMAGING THE BAFFLES DURING CLEANOUT.
SEDIMENT DEPTH SHOULD NEVER EXCEED HALF THE DESIGNED STORAGE DEPTH. AFTER THE CONTRIBUTING
DRAINAGE AREA HAS BEEN PROPERLY STABILIZED, REMOVE ALL BAFFLE MATERIALS AND UNSTABLE
SEDIMENT DEPOSITS, BRING THE AREA TO GRADE, AND STABILIZE IT.
7. INSPECT INLETS AT LEAST WEEKLY AND AFTER EACH SIGNIFICANT (1/2 INCH OR GREATER) RAINFALL EVENT.
CLEAR THE MESH WIRE OF ANY DEBRIS OR OTHER OBJECTS TO PROVIDE ADEQUATE FLOW FOR SUBSEQUENT
RAINS. TAKE CARE NOT TO DAMAGE OR UNDERCUT THE WIRE MESH DURING SEDIMENT REMOVAL. REPLACE
STONE AS NEEDED.
8. INSPECT SILT FENCES AT LEAST ONCE A WEEK AND AFTER EACH RAINFALL. MAKE ANY REQUIRED REPAIRS
IMMEDIATELY. SHOULD THE FABRIC OF A SILT FENCE COLLAPSE, TEAR, DECOMPOSE OR BECOME INEFFECTIVE,
REPLACE IT PROMPTLY. REMOVE SEDIMENT DEPOSITS AS NECESSARY TO PROVIDE ADEQUATE STORAGE
VOLUME FOR THE NEXT RAIN AND TO REDUCE PRESSURE ON THE FENCE. TAKE CARE TO AVOID
UNDERMINING THE FENCE DURING CLEANOUT. REMOVE ALL FENCING MATERIALS AND UNSTABLE SEDIMENT
DEPOSITS AND BRING THE AREA TO GRADE AND STABILIZE IT AFTER THE CONTRIBUTING DRAINAGE AREA
HAS BEEN PROPERLY STABILIZED.
9. CONSTRUCTION ENTRANCE WILL BE PERIODICALLY TOP DRESSED WITH AN ADDITIONAL 2 INCHES OF
NO. 4 STONE TO MAINTAIN PROPER DEPTH. ANY SEDIMENT THAT IS TRACKED INTO THE STREET WILL BE
IMMEDIATELY REMOVED.
W. INSPECT CHECK DAMS AND CHANNELS AT LEAST WEEKLY AND AFTER EACH SIGNIFICANT (1/2 INCH OR
GREATER) RAINFALL EVENT AND REPAIR IMMEDIATELY. CLEAN OUT SEDIMENT, STRAW, LIMBS, OR OTHER
DEBRIS THAT COULD CLOG THE CHANNEL WHEN NEEDED.
ANTICIPATE SUBMERGENCE AND DEPOSITION ABOVE THE CHECK DAM AND EROSION FROM HIGH FLOWS
AROUND THE EDGES OF THE DAM. CORRECT ALL DAMAGE IMMEDIATELY. IF SIGNIFICANT EROSION OCCURS
BETWEEN DAMS, ADDITIONAL MEASURES CAN BE TAKEN SUCH AS, INSTALLING A PROTECTIVE RIPRAP LINER
IN THAT PORTION OF THE CHANNEL.
REMOVE SEDIMENT ACCUMULATED BEHIND THE DAMS AS NEEDED TO PREVENT DAMAGE TO CHANNEL
VEGETATION, ALLOW THE CHANNEL TO DRAIN THROUGH THE STONE CHECK DAM, AND PREVENT LARGE FLOWS
FROM CARRYING SEDIMENT OVER THE DAM. ADD STONES TO DAMS AS NEEDED TO MAINTAIN DESIGN HEIGHT
AND CROSS SECTION.
a