HomeMy WebLinkAbout021 C403.pdf-IN
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�7 77% -7 '77.,
7777
LEED S.S. CREDIT 1 SITE
SELECTION: ALL BUILT -UPON AREAS
SHALL MAINTAIN A MIN. 50' CLEAR
BUFFER FROM ALL PERENNIAL AND
ITERMITTENT SURFACE WATERS. 50-1/
FOREBAY PRETREATMENT AREA
CLASS A EROSION CONTROL STONE 011
11' DEEP LINED W/ FILTER FABRIC
69
PLAN11_bl1G SCHEDULE:- 0
A,
A,
A,
SURFACE OF BIORETENTION CELL GRASS BUFFER STRIP. INSTALL
SHALL BE PLANTED WITH SOD WHERE CD/ 4P
OTHER GRASSES ARE NOT INDICATED. SOD BETWEEN BIORETETION AND
CURB LINE (TYP.).
TOP OF SOD -VEGETATED
BERM (TYP.)
TOP ELEV.=862.5 MIN.
TOP WIDTH 5' MIN.
3:1 MAX SIDE SLOPES
SCH. 40,PVC CLEAN -OUT MIN.
FOR UNDERDRAIN W/SCREW OFF CAP.
IN� L, MIN. 12" ABOVE GRADE (TYP.).
(7) CLEAN -OUTS SHOWN A S
PERFORATED 4" SCH
40 PVC UNDERDRAII� J
18" ADS N-12--,\,,, (TYP.)
HDPE OUTLET PIPE
INV. OUT=856.1
STANDARD PRECAST YAR
INLET: MEETING NCDOT SPEC
6" CONCRETE TOP W/2' X
GRATE MIN. (NEENAH R-3339-
OR APPROVED EQUA
TOP EDGE GRATE-_860.7
INV. IN=856 71
INV. OUT=856.
8' WIDE OVERFLOW
SPILLWAY ELV.=861.5
CLASS B EROSION
CONTROL STONE
W/FILTER FABRIC
ow lox 07-
4
NOTES:
1 . ALL BIORETENTION FACILITIES SHALL HAVE A
MINIMUM 20 FOOT ACCESS EASEMENT
CONNECTING TO A DEDICATED PUBLIC RIGHT
OF WAY. ACCESS ROAD SHALL HAVE MIN. 12'
STABILIZED WIDTH, MAX. LONG. GRADE OF 15%,
MAX. CROSS -SLOPE 5X
2. ALL DRAINAGE AREAS TO A BIORETENTION
FACILITY ARE TO BE STABILIZED PRIOR TO
INSTALLA11ON OF AMENDED SOILS, MULCH OR
PLANTINGS.
3. BIORETENTION CELLS ARE NOT LOAD -BEARING
STRUCTURES, DO NOT COMPACT THE BOTTOM
SOIL LAYER. WHEN EXCAVATING THE BOTTOM
12" LAYER OF SOIL, RAKE THE TEETH OF
BACKHOE BUCKET TO SCARIFY AND TILL
SURFACE INSTEAD OF USING THE BUCKET TO
SCOOP AND MAKE THE SURFACE SMOOTH.
4. AVOID EXCAVATING IN WET CONDITIONS OR
WHEN STORM WILL HIT BEFORE CELLS FILL
MEDIA CAN BE PLACED. EXCAVATION BEST
AFTER SEVERAL CONSECUTIVE WARM IND DRY
DAYS.
5. AMENDED SOIL WILL ONLY BE PERMITTED WITH
A VALID SOIL ANALYSIS REPORT. NO AMENDED
SOIL SHALL BE ALLOWED ON THE SIDE
SLOPES.
6. INSTALL STRUCTURAL PLASTIC RACK
(STORMRAX), OR GALVANIZED RACK AROUND
ALL OUTLET OPENINGS TO PREVENT LOSS OF
MULCH.
7. PVC UNDERDRAIN PIPE SHOULD HAVE 3/8"
PERFORATIONS SPACED AT 6" CENTERS, MIN.
4 HOLES PER ROW. MAX SPACING OF
UNDERDRAIN PIPE IS 10 FEET ON CENTER.
HDPE SHALL ADHERE TO AASHTO M252
SPECS.
8. UNDERDRAIN CLEANOUTS SHOULD EXTEND A
MIN. OF 12" ABOVE TOP SURFACE OF MULCH
OR GRASS LAYER. (1) CLEANOUT IN LOW SPOT
SHALL BE FLUSH WITH TOP OF SURFACE TO
ALLOW DRAWDOWN (MUST HAVE MARKER)
7. ONLY SMALL MATURING TREES ARE ALLOWED
TO BE PLANTED IN THE AMENDED SOILS.
BIORETENTIC"M AREA P LAN_
0 20 40 60
GRAPHIC SCALE
1"=20'
PAVEMENT
OR OTHER STRUCTURAL 15" PONDING MAXIMUM
COMPONENTS FOR ALL STORMS. SEE
PLAN FOR ELEVATIONS.
OPTIONAL 2"-3" STONE WITH FILTER
FABRIC AROUND BOTTOM AND SIDES
(RECOMMENDED ADJACENT TO PAVEMENT NTH
OUT CURBS. 1' MIN WIDTH, 1' MIN DEPTH)
OVERFLOW OUTLET COVERED WHEN MULCH LAYER IS
NTH WIRE MESH OR HEAVY REQUIRED USE 3"
PLAS11C RACK. SEE PLAN DOUBLE -SHREDDED
FOR TYPE AND ELEVATIONS HARDWOOD MULCH MIN.
27. MAX SOD ON SIDE -SLOPES
\& M M
a. S7
r
n Vol
Y:
� ZN�
MEDIA
10' MiN.
SURFACE
AREA
4P MIN.
IN,
OUTLET PIPE
.5% MIN SLOPE-'
4" DIAMETER PERFORATED
UNDERDRAIN PIPE. PVC OR UNDERDRAIN GRAVEL BED
HDPE (PER AASHTO M252). SECTION A -A (#57 WASHED STONE) WITH
HEADER PIPE SHOULD BE 6" WT.S. 2" CHOCKING STONE ON TOP
BOWL WIDTH ON THE BOTTOM W/PERMEABLE FILTER FABRIC
SHOULD BE CLOSE TO THE ON SIDES AND BOTTOM (TYP.)
WIDTH ON THE SURFACE
BIORETENTION CROSS-SECTION (TYP.)
100-
AFOR
GENERAL BIORETENTION PLAN NOTES:
OPERATION AND MAINTENANCE PROVISIONS:
1.
BIORETENTION, PLAN CONTRIBUTES TO LEED S.S. CREDITS 6.1 STORMWATER DESIGN -QUANTITY CONTROL AND 6.2 STORMWATER DESIGN -QUALITY CONTROL.
IMPORTANT OPERATION AND MAINTENANCE PROCEDURES:
2.
BIORETENTION CELLS SHALL BE CONSTRUCTED IN ACCORDANCE WITH NCDENR STORMWATER BMP MANUAL CHAPTER 12 AND THESE PLANS. ALL ITEMS TO BE
1. IMMEDIATELY AFTER THE BIORETENTION CELL IS ESTABLISHED, THE PLANTS
USED IN CONSTRUCTION SHALL BE SUBMITTED TO ENGINEER FOR APPROVAL PRIOR TO INSTALLATION.
WILL BE WATERED TWICE WEEKLY IF NEEDED UNTIL THE PLANTS BECOME
3.
THE GEOMETRY OF THE CELL SHALL BE SUCH THAT NO DIMENSION IS LESS THAN 10 FEET (WIDTH, LENGTH OR RADIUS).
ESTABLISHED (COMMONLY SIX WEEKS - NO MORE THAN 6 MONTHS).
4.
CLEAN -OUT PIPES MUST BE PROVIDED NTH UNDERDIRAINS AND EXTEND A MINIMUM OF 12" ABOVE GRADE. CLEAN -OUT SHALL BE 4" MIN. SCH. 40 PVC NTH A
2. SNOW, MULCH OR ANY OTHER MATERIAL SHALL NEVER BE PILED ON THE
SURFACE OF THE BIORETEN11ON CELL.
SCREW OFF CAP.
5.
PONDING DEPTH SHALL BE 12 INCHES OR LESS, SEE PLAN.
3. HEAVY EQUIPMENT SHALL NEVER BE DRIVEN OVER THE BIORETENTION CELL.
4. NO SEDIMENT SHALL ENTER THE BIORETENTION CELL DURING CONSTRUCTION.
CONSTRUCTIQN
6.
SEQUENQINQ:
THE BIORETENTION CELL WILL TAKE THE PLACE OF THE ONSITE SEDIMENT BASIN AFTER ALL DISTURBED AREAS ARE COMPLETELY STABILIZED.
SEDIMENT ACCUMULATION CAUSES CELL FAILURE AND MUST BE REMOVED.
SEDIMENT FROM ENTERING THE
SPECIAL CARE SHALL BE TAKEN TO PREVENT
7.
THE DRAINAGE AREA TO THE CELL SHALL BE STABILIZED BEFORE CELL CONSTRUCTION BEGINS IN ORDER TO PREVENT CLOGGING.
BIORETENTION CELL AFTER CONSTRUCTION.
8.
FOR ROADWAYS DRAINING TO THE CELL, THE SUBBASE COURSE (CRUSHER RUN) AND THE BASE COURSE LAYER OF PAVEMENT NEED TO BE IN PLACE PRIOR TO
5. ONCE A YEAR, A SOIL TEST OF THE SOIL MEDIA SHOULD BE CONDUCTED.
CELL CONSTRUCTION.
6. ANNUAL FLUSHING THROUGH PIPE CLEANOUTS IS RECOMMENDED TO
9.
IF FINES GET WASHED INTO THE EXCAVATED CELL, THEY MUST BE REMOVED BEFORE BUILDING THE CELL IN ORDER TO RESTORE THE IN -SITU SOILS
FACILITATE UNCLOGGING OF THE PIPES WITHOUT DISTURBING THE
BIORETENTION AREA&
PERMEABILITY.
10.
PROTECT AND COVER THE CELL MEDIA NTH IMPERMEABLE PLASTIC DURING CONSTRUCTION.
7. AFTER THE BIORETENTION CELL IS ESTABLISHED, IT SHOULD BE INSPECTED
ONCE A MONTH AND WITHIN 24 HOURS AFTER EVERY STORM EVENT GREATER
THAN 1.0 INCHES. RECORDS OF OPERATION AND MAINTENANCE WILL BE
SOIL
11.
MEDIA:
SOIL MIX TO BE UNIFORM AND FREE OF STONES, STUMPS, ROOTS OR OTHER SIMILAR MATERIAL GREATER THAN 2 INCHES. THE HOMOGENOUS SOIL MIX OF
CT
KEPT IN A KNOWN SET LOCATION AND WILL BE A VAILABLE UPON REQUESI.
85-88% WASHED SAND BY VOLUME (USDA SOIL TEXTURAL CLASSIFICATION), 8 TO 12 PERCENT FINES (SILT AND CLAY), AND 3 TO 5% ORGANIC MATTER (PEAT
MOSS AND PINE BARK FINES) SHALL BE USED.
12.
THE PHOSPHORUS INDEX (P-INDEX) FOR THE SOIL MUST BE LOW, BETWEEN 10 AND 30. THIS IS ENOUGH PHOSPHORUS TO SUPPORT PLANT GROWTH WITHOUT
INSPECTION ACTIVITIES SHALL BE PERFORMED AS FOLLOWS. ANY PROBLEMS
f%cj
THAT ARE FOUND SHALL BE REPAIRED IMMEDIATELY.
LAVUK"NU tmuz:arjumu,� MUM mr- 1-
13.
SOIL MEDIA SHOULD BE SENT TO NC DEPARTMENT OF AGRICULTURE (NCDA) LABS TO BE ANALYZED. CONTRACTOR IS TO SUBMIT THE REPORT TO THE
ENGINEER FOR APPROVAL.
Operation and Maintenance Provisions for Bioretention Areas
14.
SOIL MEDIA SHALL BE ANALYZED VERIFYING CONTENT. CHOCKING STONE AND UNDERDRAIN STONE SIEVE ANALYSIS WITH D15 AND D50 PARTICLE SIZES SHALL
BE SUBMITTED TO THE ENGINEER FOR PRIOR APPROVAL. SOURCE AND SUPPLIER CONTACT INFORMATION SHALL BE PROVIDED TO ENGINEER PRIOR TO
INSTALLATION.
IBMP Element:
Potential Problem:
How to Remediate the Problem:
15.
MEDIA PERMEABILITY OF 1-6 IN/HR IS REQUIRED, 1-2 IN/HR IS PREFERRED. PERMEABILITY RATE TO BE TESTED AND REPORT SUBMITTED TO ENGINEER FOR
The entire BMP
Trash/debris is present.
Remove the trash/debris.
APPROVAL.
The perimeter of the
�Ar as of bare soil and/or
Regrade the soil if necessary to remove
ELANT
AREANTY NOTE
bioretention cell
erosive gullies have formed.
the gully, then plant a ground cover and
16.
THE PLANT AND MULCH INSTALLATION FOR BIORETENTION SHALL BE PERFORMED BY A PROFESSIONAL LANDSCAPE CONTRACTOR.
water until it is established. Provide
17.
THE CONTRACTOR SHALL MAINTAIN A ONE YEAR 100% CARE AND REPLACEMENT WARRANTY FOR ALL PLANTINGS, GRASS AND MULCH.
lime and a one-time fertilizer
application.
18.
THE PERIOD OF CARE AND REPLACEMENT WARRANTY SHALL BEGIN AFTER FINAL INSPECTION AND APPROVAL OF THE COMPLETE INSTALLATION OF ALL PLANTS
The inlet device: pipe,
The pipe is clogged (if
Unclog the pipe. Dispose of the
AND SHALL CONTINUE FOR ONE YEAR.
stone verge or swale
applicable). -
sediment off -site.
19.
PLANT REPLACEMENTS SHALL BE IN ACCORDANCE NTH THE MAINTENANCE SCHEDULE.
The pipe is cracked or
Replace the pipe.
BIORETENTION PLANTING GUIDELINES:
1
ALL PLANT MATERIAL SHOULD CONFORM TO THE STANDARDS OF THE CURRENT EDITION OF AMERICAN STANDARD FOR NURSERY STOCK AS APPROVED BY THE
.
AMERICAN STANDARDS INSTITUTE, INC. ALL PLANT GRADES SHALL BE THOSE ESTABLISHED BY THE CURRENT EDITION OF AMERICAN STANDARDS FOR NURSERY
STOCK.
2.
ALL PLANT MATERIALS SHOULD HAVE NORMAL, WELL -DEVELOPED BRANCHES AND VIGOROUS ROOT SYSTEMS, AND BE FREE FROM PHYSICAL DEFECTS, PLANT
DISEASES, AND INSECT PESTS.
3.
ALL PLANT MATERIALS SHOULD BE TAGGED FOR IDENTIFICATION WHEN DELIVERED.
4.
OPTIMUM PLANTING TIME IS FALL. WINTER PLANTING IS ACCEPTABLE (WILL VARY FOR WESTERN PIEDMONT AND MOUNTAINS OF NC). SPRING IS ACCEPTABLE BUT
WILL REQUIRE MORE SUMMER WATERING THAN FALL PLANTING. SUMMER PLANTING IS THE LEAST DESIRABLE AS IT DRASTICALLY INCREASES PLANT MORTALITY
The pretreatment area
AND REQUIRES REGULAR WATERING IMMEDIATELY FOLLOWING INSTALLATION.
5.
PLANT SIZE SHOULD BE NO LESS THAN 2.5"DBH FOR TREES; 3-GALLON FOR SHRUBS; AND 1-QUART FOR HERBACEOUS PLANTS.
6.
WOODY VEGETATION SHOULD NOT BE PLANTED AT INFLOW LOCATIONS.
7.
FOR BEST SURVIVAL, TREES SHOULD BE PLANTED WITH THE TOP OF THE ROOT BALL PARTIALLY OUT OF THE MEDIA. THEY SHOULD BE PLANTED TO HAVE FROM
1/3 TO 1/2 OF THE ROOT BALL WITHIN THE MEDIA. THIS WOULD LEAVE FROM 2/3 TO 1/2 OF THE ROOT BALL ABOVE THE MEDIA.
MULCH
8.
SHOULD BE:
FREE OF WEED SEEDS, SOIL, ROOTS, AND OTHER MATERIAL THAT IS NOT BOLE OR BRANCHWOOD OR BARK.
9.
COMMERCIALLY AVAILABLE DOUBLE OR MPLE-SHREDDED HARDWOOD MULCH SHALL BE USED, THIS MULCH HAS BEEN FOUND TO BE LESS LIKELY TO WASH
AWAY THAN OTHER FORMS OF MULCH (SUCH AS PINE).
10.
MULCH DEPTHS DEPEND ON THE TYPE OF MATERIAL USED AND THE DRAINAGE AND MOISTURE HOLDING -CAPACITY OF THE SOIL. A 2-4 INCH LAYER (AFTER
THE
SETTLING) IS ADEQUATE FOR MOST APPLICATIONS. EXCESSIVE APPLICATION OF MULCH CAN RESULT IN A SITUATION WHERE THE PLANTS ARE GROWING IN
MULCH AND NOT THE SOIL. OVER -MULCHED PLANTS ARE EASILY DAMAGED DURING PERIODS OF DROUGHT STRESS. MULCHING IN AN AREA THAT IS
POORLY -DRAINED CAN AGGRAVATE THE CONDITION.
The bioretention cell:
11.
MULCH CAN BE APPLIED ANY TIME OF YEAR, HOWEVER, THE BEST TIME TO MULCH IS LATE SPRING AFTER THE SOIL HAS WARMED.
vegetation
12.
AT LEAST 6 MONTHS OLD (12 MONTHS IS IDEAL).
13.
UNIFORMLY PLACED ABOUT 3 INCHES DEEP.
14.
RENEWED AS NEEDED TO MAINTAIN A 2-4"DEPTH; ON PREVIOUSLY MULCHED AREAS, APPLY A ONE -INCH LAYER OF NEW MATERIAL. ADDED 1-2 TIMES PER YEAR
AND COMPLETELY REMOVED /REPLACED ONCE EVERY TWO YEARS.
GEASS:
15. GRASS SHOULD NEVER BE SEEDED, USE SOD INSTEAD. WHEN USING SOD, AVOID SOD THAT IS GROWN IN SOIL THAT HAS AN IMPERMEABLE LAYER (SUCH AS
CLAY). FESCUE/BLUEGRASS MIX IS RECOMMENDED FOR COLDER CLIMATES.
BIORETENTION MAINTENANCE NOTES:
BiORETENTION FACILITIES REQUIRE PLANT, SOIL, MULCH, AND UNDER -DRAIN MAINTENANCE TO ENSURE OPTIMAL INFILTRATION, STORAGE, AND POLLUTANT REMOVAL CAPABILITIES.
BIORETENTION
MAINTENANCE REQUIREMENTS ARE TYPICAL LANDSCAPE CARE PROCEDURES AND INCLUDE:
1.
WATERING: PLANTS SHOULD BE SELECTED TO BE TOLERANT OF THE BIORETENTION FACILITY'S PARTICULAR CONDITIONS. WATERING SHOULD NOT BE REQUIRED AFTER
ESTABLISHMENT (ABOUT 2 TO 3 YEARS). HOWEVER, WATERING MAY BE REQUIRED DURING PROLONGED DRY PERIODS AFTER PLANTS ARE ESTABLISHED.
2.
EROSION CONTROL: INSPECT FLOW ENTRANCES, PONDING AREA, AND SURFACE OVERFLOW AREAS PERIODICALLY� REPLACE SOIL, PLANT MATERIAL, AND/OR MULCH IN AREAS
The bioretention cell:
WHERE EROSION HAS OCCURRED. EROSION PROBLEMS SHOULD NOT OCCUR WITH PROPER DESIGN EXCEPT DURING EXTREME WEATHER EVENTS. IF EROSION PROBLEMS 00 OcCUR,
soilsandmulch
THE FOLLOWING ISSUES SHOULD BE RE -ASSESSED: FLOW VOLUMES FROM THE CONTRIBUTING DRAINAGE AREA AND BIORETENTION SIZE; FLOW VELOCITIES AND GRADIENTS WITHIN
THE BIORETENTION FACILITY; FLOW DISSIPATION AND EROSION PROTECTION METHODS IN THE PRETREATMENT ANDIN-FLOW AREAS. IF SEDIMENT IS DEPOSITED IN THE
BIORETENTION FACILITY, IMMEDIATELY DETERMINE THE SOURCE, REMOVE EXCESS DEPOSITS, AND CORRECT THE PROBLEM.
3.
PLANT MATERIAL: DEPENDING ON PLANTS SELECTED AND AESTHETIC REQUIREMENTS, OCCASIONAL PRUNING AND REMOVAL OF DEAD PLANT MATERIAL MAY BE NECESSARY.
REPLACE ALL DEAD PLANTS. HOWEVER, IF SPECIFIC PLANTS CONSISTENTLY HAVE A HIGH MORTAU-TY RATE, ASSESS THE CAUSE AND REPLACE WITH APPROPRIATE SPECIES.
PERIODIC WEEDING IS NECESSARY UNTIL GROUNDCOVER PLANTS ARE ESTABLISHED. WEEDING SHOULD BECOME LESS FREQUENT IF AN APPROPRIATE PLANT DENSITY HAS BEEN
USED.
4.
NUTRIENTS AND PESTICIDES: THE SOIL MEDIA AND PLANT MATERIAL SHOULD HAVE SLEN SELECTED FOR OPTIMUM FERTILITY, PLANT ESTABLISHMENT, AND GROWTH WITHIN THE
PARTICULAR CONDITIONS OF EACH BIORETENTION FACILITY. NUTRIENT AND PESTICIDE INPUTS SHOULD NOT BE REQUIRED AND WILL DEGRADE THE POLLUTANT PROCESSING
CAPABILITY OF THE 8IORETEN11ION FACILITY, AS WELL AS CONTRIBUTE TO ADDITIONAL POLLUTANT LOADING TO RECEIVING WATERS. BY DESIGN, BIORETENTION FACILILITIES ARE
TYPICALLY SPECIFIED IN WATERSHEDS WHERE PHOSPHOROUS AND NITROGEN LEVELS ARE OFTEN ELEVATED. THEREFORE, THESE SHOULD NOT BE LIMITING NUTRIENTS WITH
REGARD TO PLANT HEALTH. IF IN QUESTION, HAVE THE SOIL ANALYZED FOR FERTILITY.
5.
MULCH: REPLACE MULCH ANNUALLY IN BIORETENTION FACILFFIES WHERE HEAVY METAL DEPOSITION IS LIKELY (E.G., DRAINAGE AREAS THAT INCLUDE COMMERCIAL/INDUSMAL
USES, PARKING LOTS, OR ROADS). IN RESIDENTIAL OR OTHER SETTINGS WHERE METAL DEPOSITION IS NOT A CONCERN, REPLACE OR ADD MULCH AS NEEDED TO MAINTAIN A 2
TO 4 INCH DEPTH AT LEAST ONCE EVERY TWO YEARS.
6.
SOIL MEDIA: SOIL MIXES FOR BIORETENTION FACILITIES ARE DESIGN TO MAINTAIN LONf� --T`11�4 FER'7#',WT f AND PC:_LUTANT PROCESSING CAPABILITY. ESTIMATES FROM METAL
ATTENUATION RESEARCH INDICATES THAT METAL ACCUMULATION SHOULD NOT PRESENT A TOXICITY CONCERN FOR AT LEAST 20 YEARS IN BIORETENTION FACILITIES (USEPA
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PONDIN
MAXIMUM
WQV & CPV
2'-4" FILTER MEDIA - HOMOGENOUS SOIL MIX
FILL SOIL MEDIA MIX- 85-88% WASHED SAND
8-12% FINES (SILT + CLAY)
3-5% ORGANICS (PEAT MOSS, PINE BARK)
P-INDEX FOR SOIL MEDIA SHOULD RANGE BETWEEN 10 AND 30
4" 'WASHED SAND
2" #8 OR #89 (CHOKING STONE)
8" (#57 WASHED STONE) GRAVEL LAYER AROUND
UNDERDRAIN - CENTER UNDERDRAIN IN GRAVEL LAYER
2' PLUS DISTANCE TO SEASONAL HIGH
WATER TABLE ELEVATION
IN SITU SOIL
IN -SITU SOIL - TmC TOMLIN LOAM
HYDROLOGIC SOIL GROUP B - SOIL SURVEY
CLOSEST SOIL BORING PUTS GROUND WATER
BELOW 854'
410RETENTION MAINTENCE TASKS
TASKS
FREQUENCY
MAINTENANCE NOTES
PRUNING
1-2TIMES/YEAR
NUTRIENTS IN RUNOFF OFTEN CAUSE BIORETETION VEGETATION TO FLOURISH
MOWING
2-12 TIM ES/YEA R
FREQUENCY DEPENDS UPON LOCATION AND DESIRED AESTHETIC APPEAL
UNIFORMLY PLACED, DOUBLE ORTRIPPLE-SHREDDED HARDWOOD
MULCHING
1-2TIMES/YEAR
MULCH ABOUT 3" DEEP
MULCH REMOVAL
1 TIME / 2-3 YEARS
REMOVAL OF MULCH ALSO INCREASES SURFACE INFILTRATTION RATE OF FILL SOIL.
1 TIME / 2-3 DAYS FOR FIRST 1-
WATERING
2 MONTHS. SPORADICALLY
IF DROUGHTY, WATERING AFTER THE INMALYEAR MAY BE REQUIRED.
AFTER ESTABLISHMENT
FERTILIZATION
1 TIME INITIALLY
ONE TIME SPOT FERTILIZATION FOR FIRSTYEAR VEGETATION
REMOVER AND REPLACE
WITHIN THE FIRSTYEAR, 10 PERCENTOF PLANTS k-1AY DIE, SURVIVAL RATES
DEAD PLANTS
ITIME/YEAR
INCREASE WITH TIME.
TASKS INCLUDE TRASH COLLECTION, SPOT WEEDING, AND REMOVING MULCH
MISCELLANEOUS UPKEEP
12 TIMES / YEAR
FROM OVERFLOW DEVICE.
The underdrain syste
(if app
The drop inlet
3���
otherwise damaged (if
applicable).
Erosion is occurring in the lRegrade the swale if necessary to
swale (if applicable).
smooth it over and provide erosion
control devices such as reinforced
turf matting or ri prap to avoid
future pro lems wit erosion.
Stone verge is clogged or
Remove sediment and clogged
covered in sediment (if
stone and replace with clean stone.
applicable).
Flow is bypassing
Regrade if necessary to route all
pretreatment area and/or
flow to the pretreatment area.
gullies have formed.
Restabilize the area after grading.
Sediment has accumulated
Search for the source of the
to a depth gre ate r than three
sediment and remedy the problem
inches.
if possible. Remove the sediment
and restabilize the pretreatment
area.
Erosion has occurred.
Provide additional erosion
protection such as reinforced turf
matting or rip.rap if needed to
prevent future erosion problems.
Weeds are present.
Remove the weeds, preferably by
hand.
Best professional practices
Prune according to best professional
show that pruning is needed
practices.
to maintain optimal plant
health.
Plants are dead, diseased or
Determine the source of the
dying.
problem: soils, hydrology, disease,
etc. Remedy the problem and
replace plants. Provide a one-time
fertilizer application to establish
the ground cover if a soil test
indicates it is necessary. If sod was
used, check to see that it was not
grown on clay or impermeable
soils. Replace sod if necessary.
Tree stakes/wires are present
Remove tree stake/wires (which
months after planting.
can kill the tree if not removed).
-,six
PAGW7 �s �reaking down or
Spot mulch if there are only
has floated away.
random void areas. Replace whole
mulch layer if necessary, Remove
the remaining much and replace
with triple shredded hard wood
mulch at a maximum depth of
three inches.
Soils and/or mulch are
Dete rm i ne the exte nt of the
clogged with sediment.
clogging - remove and replace
eitherjust the top layers orthe
entire media as needed. Dispose of
the spoil in an appropriate off -site
location. Use triple shredded hard
wood mulch at a maximum depth
of three inches. Search forthe
source of the sediment and remedy
the problem if possible.
An annual soil test shows
Dolomitic lime shall be applied as
that pH has dropped or
recommended per the soil test and
heavy metals have
toxic soils shall be removed,
accumulated in the soil
disposed of properly and replaced
media.
with new planting media.
Clogging has occurred.
Wash out the underdrain system.
Clogging has occurred.
Clean out the drop inlet. Dispose
of the sediment off -site.
The drop inlet is damaged
Repair or replace the drop inlet.
Erosion or other signs of
Contact the NC Division of Water
damage have occurred at the Quality 401 Oversight Unit at -
outlet.
733-1786.
IT SHALL Hf- THE ccA,7RAcioR,5 1?EsPoNs,1q1ury
TO CONTACT 7W CIOL LNOWEER TO NSU� 77M
ALL PAR77f-S ARC /N PO Of - THE MOST
Ctfiti��T SET OF CONSIRUCTION OOCUMENT-5,
8f-FORE CONSTRUCTION COMM