7_NCS000414_SCM O&M Plan_20210708

Appendix A
Town of Chapel Hill, NC
STORMWATER CONTROL MEASURES (SCMs)
OPERATIONS AND
MAINTENANCE PLAN
2021

Town of Chapel Hill SCMs
PIN
Municipal Location
Street Address
Month Built
Year Built
Stormwater Control Measures
Bioretention (5), Stormfilter (1), Level Spreader
9789945308
Chapel Hill Library
100 Library Drive
February
2013
Filter Strip (2), Grassed Swale (1)
Dickerson Court/Bolin
9789929369
Dickerson Ct
July
2012
Bioretention (1)
Trail
9871800325
Fire Burn Building
6902 Millhouse Road
April
2019
Wet Pond (1), Sand Filter (1)
9787271011
Fire Station No. 5
100 Bennett Road
August
2000
Wet Pond (1)
9788171392
Hargraves
216 N Roberson St
May
2012
Bioretention (1), Permeable Pavement (1)
Stormwater Wetland (1), Dry Pond (1), Wet Pond(1)
9880127274
Homestead Park
100 Northern Park Drive
April
1997
1R5d01 Ephesus Church
9799547762
Ephesus Park
April
2019
Bioretention (1)
Southern Community
Stormwater Wetland (1), Bioretention (1),
9777937966
1000 Sumac Rd
August
2009
Park
Infiltration Basin (1), Wet Pond (1)
Piney Mt. Road and
9789693622
Eastwood
1986
Dry Pond (2)
Louis Armstrong Ct
828 Martin Luther KingJuly
9789413949
Police Department
2009
Bioretention (1)
Jr. Blvd.
9798350019
Fire Station 2
1003 S. Hamilton Rd
May
2018
Storm Filter (1)
Homestead Aquatic
9880127274
100 Northern Park Drive
Bioretention (1), Wet Pond (1)
Center
2008

STORMWATER OPERATIONS AND
MAINTENANCE PLAN
for
Chapel Hill Public Library
Chapel Hill, NC
PIN:978909405308

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Applicable for SCM #1, SCM #3, SCM #4, SCM #8, and SCM #9
Stormwater Operation and Maintenance Plan
BIORETENTION CELL
Regular inspection and maintenance are necessary to preserve long-term functionality of Stormwater
Control Measures "SCMs" per the original design intent. This Plan outlines the Town of Chapel Hill
requirements for regular inspection and maintenance of Bioretention Cell SCMs. The Owner as defined
in the Agreement shall keep a copy of this Stormwater Operations and Maintenance Plan, the SCM
Inspection and Maintenance Log, and a copy of the approved As -Built Plans in a known set location and
made available to the Town of Chapel Hill upon request.
Annual inspections shall be performed by a qualified licensed Professional Engineer or Landscape
Architect. Routine maintenance and inspection shall be performed by a qualified professional with
NCSU Stormwater Inspection and Maintenance Certification or similar certification.
The qualified professional shall maintain a SCM Inspection and Maintenance Log and make available to
the Town of Chapel Hill upon request. All inspections shall be recorded in the log according to the
frequency in the Inspection and Maintenance Table (Table 1 below) and within 24 hours after storm
events that exceed 1.0 inch of rainfall. Any deficit SCM elements noted during inspection shall be
recorded in the log and immediately corrected, repaired, or replaced. All routine and
corrective/emergency maintenance activities shall be recorded in the log. The log template can be
found at the Town of Chapel Hill Stormwater Control Measures website.
An Annual Inspection and Maintenance Report shall be submitted to the Town of Chapel Hill
Stormwater Department. The report shall detail the status of the SCM and maintenance performed as
outlined in the SCM Inspection Report Guidelines. A copy of the annual report shall be submitted to the
Town of Chapel Hill Stormwater Management Division beginning one year after issuance of the
Certificate of Occupancy.
REQUIRED INSPECTION AND MAINTENANCE TASKS FOR BIORETENTION CELL
NOTE: The following inspection and maintenance table is not an exhaustive list of inspection and
maintenance tasks. It is the responsibility of the professional inspecting the facility to perform
comprehensive maintenance for the SCM to be operational.

Table 1: Inspection and Maintenance Provisions for Bioretention Cell
OF
MAINTENANCE ACTIVITIES
INSPECTIONSFREQUENCY
• Watering is needed twice a week until the plants become established (commonly
Upon
6-8 weeks) and then as needed during first growing season (April -October),
construction
depending on rainfall.
completion
• Remove and replace dead plants.
• Remove any tree stakes or wires six months after planting.
• Mow any bioretention with turf cover to a height of approximately six to eight
inches and remove grass clippings.
Once every
• Check inlet, collection system and outlet device for clogging. Remove
accumulated grit, leaves, debris and any other obstructions and dispose off -site.
quarter
. Inspect for ponding and bare or eroding areas and make adjustments as
necessary.
• Remove trash and/or debris from the bioretention area.
Twice during
the growing
• Pull out weeds and dead, diseased, or invasives plants preferably by hand.
season
• For bioretention areas without turf cover, supplement triple shredded hard wood
mulch in devoid areas to maintain a maximum 3 inch layer.
• Prune trees and shrubs to best professional practice. Thin vegetation so that
Annually
sunlight can penetrate the bioretention surface.
• Inspect the observation/cleanout wells to ensure that the underdrain is
functioning. If clogging has occurred, wash out the underdrain.
• Inspect all structural elements.
• Conduct a soil test for pH and heavy metals and determine the infiltration rate.
• For bioretention areas without turf cover, remove and replace the mulch layer
Once every
with triple shredded hard wood. The ideal time to reapply mulch is in the late
2-3 years
spring.
. An extensive replanting is required if 50% minimum coverage throughout the
basin is not achieved in the bioretention after the second growing season.
Once every 5
• Perform facility "make -over" to maintain intended landscaping regime and
to 7 years
address any maintenance problems detected during routine inspections. After 5
growing seasons, the vegetation should achieve 75/ coverage.
Vegetation
As Needed
• If the bioretention cell suffers from dead or diseased plants or overgrown with
(Typical
invasive species, evaluate the source of the problem: soils, hydrology, species,
Problems)
and/or type of disease to determine the cause of the plant failure.
o Remediate the problem by selecting new species and/or implementing an
eradication plan for invasives.

o Ensure appropriate plant maintenance is occurring.
o A one-time fertilizer application to establish ground cover is permissible if
a soil test indicates it is necessary. No portion of the dry detention system
shall be fertilized after the initial fertilization that is required to establish
the vegetation.
o Consult with the Town of Chapel Hill Stormwater Management Division
before any aquatic herbicide is used and site specific approval is given.
• If vegetation coverage is not achieved, add reinforcement planting to maintain
desired vegetation density and/or split out perennials to increase plant cover.
Desired vegetation coverage is 50% after 2 growing seasons and 75% after 5
growing seasons
• Remediate bare soils or erosive gullies.
o In perimeter areas, regrade the soil to remove the gully, plant a ground
cover and water until it is established. If soil test shows that the pH has
dropped, dolomitic lime shall be applied as recommended.
o Within the pretreatment area, provide erosion control devices such as
reinforced turf matting or riprap to avoid future problems with erosion.
Filter Media Failure
• If the bioretention area shows signs of clogging, identify source of sediment and
work to remediate or eliminate it before proceeding with the following
maintenance tasks.
o Flush the underdrains and capture any sediment before it enters any
downstream stream or storm drain system.
o Conduct one or more test pits to determine the depth of soil
contamination.
o Before remediating the filter bed, remove and temporary store any plants.
o Remove the accumulated sediment to the point where sediment is no
longer observed in the soil media plus an additional 2 inches of soil. Either
replace with new media or till 2 to 3 inches of sand into the upper 8 to 12
inches of soil.
o Dispose of any removed soil in an appropriate off -site location.
o Replant and mulch the area of disturbance.
• If soil test shows that the pH has dropped, dolomitic lime shall be applied as
recommended.
• If the soil test shows that heavy metals have accumulated, the toxic soils shall be
removed, disposed of properly, and replaced with new planting media.
Structural Integrity
• Replace or repair any cracked, separated or damaged inlet pipes, drop inlets,
overflow structure, outfalls, impoundment walls or other structural elements.
Functionality
• If flow is bypassing the pretreatment area, regrade to route all flow to the
pretreatment area.
• Sediment Accumulation
o Maintain stable ground cover in the drainage area.

o Sweep or vacuum sediment on pavement in the contributing drainage
area.
o If sedimentation or clogging is occurring in the inlet, design modification
may be needed to ensure adequate drop or slope between inlet and filter
bed.
o If sediment has accumulated in the forebay area or basin reducing its
depth to 75% of the original design depth, remove the sediment,
restabilize the area, and replace with clean rock. Search for the source of
the sediment in the drainage area and remedy the problem if possible.
• If greater than one feet of localized bed sinking and/or sediment is observed by
the underdrain or overflow, conduct a test pit excavation by hand to examine
subsurface conditions. Look for sediment across layers, discoloration, voids, loss
of material. Cause of bed sinking may be breached material layers, poor
connections, or damaged pipes. Repair the test pit to full functionality without
cross contamination of the individual material layers.
For additional information or if damage has occurred at the outlet which effects the
receiving water, contact the Town at Chapel Hill Stormwater Management at 919-
969-7246 (RAIN).

Applicable for SCM #2
Stormwater Operation and Maintenance Plan
GRASS SWALES
Regular inspection and maintenance are necessary to preserve long-term functionality of Stormwater
Control Measures "SCMs" per the original design intent. This Plan outlines the Town of Chapel Hill
requirements for regular inspection and maintenance of Grass Swale SCMs. The Owner as defined in
the Agreement shall keep a copy of this Stormwater Operations and Maintenance Plan, the SCM
Inspection and Maintenance Log, and a copy of the approved As -Built Plans in a known set location and
made available to the Town of Chapel Hill upon request.
Annual inspections shall be performed by a qualified licensed Professional Engineer or Landscape
Architect. Routine maintenance and inspection shall be performed by a qualified professional with
NCSU Stormwater Inspection and Maintenance Certification or similar certification.
The qualified professional shall maintain a SCM Inspection and Maintenance Log and make available to
the Town of Chapel Hill upon request. All inspections shall be recorded in the log according to the
frequency in the Inspection and Maintenance Table (Table 1 below) and within 24 hours after storm
events that exceed 1.0 inch of rainfall. Any deficit SCM elements noted during inspection shall be
recorded in the log and immediately corrected, repaired, or replaced. All routine and
corrective/emergency maintenance activities shall be recorded in the log. The log template can be
found at the Town of Chapel Hill Stormwater Control Measures website.
An Annual Inspection and Maintenance Report shall be submitted to the Town of Chapel Hill
Stormwater Department. The report shall detail the status of the SCM and maintenance performed as
outlined in the SCM Inspection Report Guidelines. A copy of the annual report shall be submitted to the
Town of Chapel Hill Stormwater Management Division beginning one year after issuance of the
Certificate of Occupancy.
REQUIRED INSPECTION AND MAINTENANCE TASKS FOR GRASS SWALES
NOTE: The following inspection and maintenance table is not an exhaustive list of inspection and
maintenance tasks. It is the responsibility of the professional inspecting the facility to perform
comprehensive maintenance for the SCM to be operational.

Table 1: Inspection and Maintenance Provisions for Grass Swales
Upon . Watering is needed twice a week until the grass become established (commonly
completion of 6-8 weeks), depending on rainfall.
construction
• Mow grass surface areas to a height of approximately six to eight inches and
remove grass clippings.
Once a quarter
• Inspect for ponding and bare or eroding areas and make adjustments (i.e.
regrade and plant ground cover) as necessary.
• Remove leaves, trash and debris within the swale and dispose off -site.
• Pull out weeds or invasives preferably by hand.
• Remediate bare soils by scarifying the surface, amending with topsoil, and/or
Annually replanting with sod or reseeding. Any planting or seeding mixtures should be
consistent with the vegetation present in the grass swale.
Functionality
• If there are eroding areas, the repair should match the causes. Insufficient
vegetative cover requires re -sodding or seeding. Higher than anticipated flow
velocities requires check dams to slow the flow.
• If erosive gullies are occurring, regrade the soil to remove the gully, plant a
ground cover, and water until it is established.
• Sediment Accumulation
o Maintain stable ground cover in the drainage area.
o Sweep or vacuum sediment on pavement in the contributing drainage
area.
o If sediment covers the grass at the bottom of the swale, remove
As needed sediment and dispose properly. Re -sod if necessary.
(Typical • If the grass swales suffers from dead or diseased plants or overgrown with
Problems) invasive species, evaluate the source of the problem: soils, hydrology, species, or
plant disease.
o Remediate the problem by selecting new grass species or implementing
an eradication plan for invasives.
o Ensure appropriate plant maintenance is occurring.
o A one-time fertilizer application to establish ground cover is permissible
if a soil test indicates it is necessary. No portion of the dry detention
system shall be fertilized after the initial fertilization that is required to
establish the vegetation.
For additional information or if damage has occurred at the outlet which effects the
receiving water, contact the Town at Chapel Hill Stormwater Management at 919-
969-7246 (RAIN).

Applicable for SCM #5 and SCM #7
Stormwater Operation and Maintenance Plan
INFILTRATION TRENCH
Regular inspection and maintenance are necessary to preserve long-term functionality of Stormwater
Control Measures "SCMs" per the original design intent. This Plan outlines the Town of Chapel Hill
requirements for regular inspection and maintenance of Infiltration Trench SCMs. The Owner as defined
in the Agreement shall keep a copy of this Stormwater Operations and Maintenance Plan, the SCM
Inspection and Maintenance Log, and a copy of the approved As -Built Plans in a known set location and
made available to the Town of Chapel Hill upon request.
Annual inspections shall be performed by a qualified licensed Professional Engineer or Landscape
Architect. Routine maintenance and inspection shall be performed by a qualified professional with
NCSU Stormwater Inspection and Maintenance Certification or similar certification.
The qualified professional shall maintain a SCM Inspection and Maintenance Log and make available to
the Town of Chapel Hill upon request. All inspections shall be recorded in the log according to the
frequency in the Inspection and Maintenance Table (Table 1 below) and within 24 hours after storm
events that exceed 1.0 inch of rainfall. Any deficit SCM elements noted during inspection shall be
recorded in the log and immediately corrected, repaired, or replaced. All routine and
corrective/emergency maintenance activities shall be recorded in the log. The log template can be
found at the Town of Chapel Hill Stormwater Control Measures website.
An Annual Inspection and Maintenance Report shall be submitted to the Town of Chapel Hill
Stormwater Department. The report shall detail the status of the SCM and maintenance performed as
outlined in the SCM Inspection Report Guidelines. A copy of the annual report shall be submitted to the
Town of Chapel Hill Stormwater Management Division beginning one year after issuance of the
Certificate of Occupancy.
REQUIRED INSPECTION AND MAINTENANCE TASKS FOR INFILTRATION BASIN
NOTE: The following inspection and maintenance table is not an exhaustive list of inspection and
maintenance tasks. It is the responsibility of the professional inspecting the facility to perform
comprehensive maintenance for the SCM to be operational.

Table 1: Inspection and Maintenance Provisions for Infiltration Trench
Upon
completion of
construction
• If a pretreatment grass filter strip has been built, watering is needed twice a
week until the grass become established (commonly 6-8 weeks), depending on
rainfall.
• If a pretreatment grass filter is present, mow grass surface areas to a height of
approximately six to eight inches and remove grass clipping.
Once a quarter
• Check conveyance system for any obstructions or clogging. Remove
accumulated grit, leaves, and debris and dispose any sediment off -site.
• Remove any trash present on the infiltration trench surface.
Twice during
the growing
• Remove plants or grass growing on the surface of the trench preferably by hand.
season
Structural integrity
• Replace or repair any cracked, separated or damaged inlet pipes, outfalls, or
other structural elements.
• Remediate bare soils or erosive gullies by regrading the soil to remove the gully,
plant a ground cover and water until it is established. If soil test shows that the
pH has dropped, dolomitic lime shall be applied as recommended.
Functionality
• Sediment Accumulation
o If sediment has accumulated in the preatreatment area to a depth
greater than six inches, remove the top few inches of drainage media
and dispose of it in a location where it will not cause impacts to the SCM
or a stream. Search for the source of the sediment in the drainage area
and remedy the problem.
As needed o If the depth in the trench is reduced to 75% of the original design depth,
(Typical remove the accumulated sediment from the infiltration system and
Problems) dispose in a location that will not impact a stream or a SCM.
• Drainage issues
o If water is present in the observation well more than 3 days after a storm
event, clean out the underdrain. If this activity does not solve the
problem, consult a professional.
o If ponding is observed on the surface more than 24 hours after a storm
event, remove accumulated sediment from top of infiltration trench and
dispose of it in a location that will not impact a SCM or stream. If the
problem persists, contact a professional.
• If the water table is within one foot of the bottom of the system for a period of
three consecutive months, contact the Town of Chapel Hill Stormwater
Management Division.
For additional information or if damage has occurred at the outlet which effects the
receiving water, contact the Town at Chapel Hill Stormwater Management at 919-
969-7246 (RAIN).

Applicable for SCM #6
ChamberMam "
Safety
Before entering into any storm sewer or underground retention/
detention system check to make sure all OSHA and local safety
regulations and guidelines are observed during the maintenance
process. Hard hats, safety glasses, steel -toed boots and any other
appropriate personal protective equipment shall be worn at all
times.
Inspection Frequency
Inspections are recommended at a minimum annually. The
first year of operation may require more frequent inspections.
Frequency of inspections will vary significantly on the local
site conditions. An individual inspection schedule should be
established for each site,
Inspections
inspection is the key to effective maintenance and is easily
performed. Inspections may need to be performed more often
in the winter months in climates where sanding operations
may lead to rapid sediment accumulations, or in equipment
washdown areas. It is very useful to keep a record of each
inspection. A sample inspection log is included for your use.
The entire treatment train should be inspected and maintained.
The treatment train may consist of an upstream sump manhole,
manifold system or pre-treatment HDS device. Inspections should
start at the upstream device and continue downstream to the
discharge orifice if incorporated into the chamber system.
Pre Treatment Device Inspection
Inspection and maintenance procedures provided by the
manufacturer should be followed for pre-treatment systems such
as a CDS11, Vortechs", VortSentry'�or VortSentrp HS, Expected
pollutants will be floatable trash, sediment and oil and grease.
Pre-treatement devices are recommended for all detention/
retention devices regardless of type.
Containment Row'" Inspection
The optional Containment Row consists of a diversion concrete
manhole with a weir and a drain down orifice, and a row of
chambers wrapped in a impermeable 20-mil HDPE liner, The
diversion weir directs the first flush flows into the Containment
Row of chambers, The majority of sediment will be captured in
the Containment Row due to the extended detention time which
allows the particles to settle out. Containment Row drains down
via an orifice located in the diversion manhole weir allowing
the remaining pollutants to be contained. Higher flows overtop
(bypass) the weir into the manifold system.
The Containment Row will typically be located in the first row
of chambers connected to the diversion manhole. Inspection
can be done through accessing the diversion manhole and
visually inspecting the Containment Row through the inlet pipe.
Inspection ports throughout the system can he used for visual
observation and measurement of sediment accumulation using a
stadia rod. When the depth of sediment accumulates over flinch
(102 mm), cleanout is recommended.
Manifold System Inspection
The main manifold pipe can be inspected from the diversion
manhole upstream. When a quarter of the pipe volume has been
filled with sediment the header system should be maintained,
Visual Inspection
Maintenance or further investigation may be required if any of
the following conditions exist:
• Evidence of an unusual amount of silt and soil build-up on
the surface.
• Clogged outlet drainpipe.
• System does not drain to the elevation of the lowest pipe in
dry conditions.
• Evidence of potholes or sinkholes
Maintenance
Underground stormwater retention/detention systems should
be inspected at regular intervals and maintained when
necessary to ensure optimum performance. The rate at which
the system collects pollutants will depend more heavily on site
activities rather than the size or configuration of the system. If
accumulated silt is interfering with the operation of the detention
system (i.e.: blocking outlet pipes or deposits significantly reduce
the storage capacity of the system) it should be removed.
It is easiest to maintain a system when there is no flow entering.
For this reason, cleanout should be scheduled during dry
weather.
It is important to block the orifice in the Containment Row
diversion manhole weir prior to maintenance to limit the
potential for pollutants to be flushed downstream.
A vacuum truck or other similar devices can be used to remove
sediment from the treatment train. Starting upstream, maintain
manholes with sumps and any pre-treatment devices (following
manufacturer recommended procedures). once maintenance
is complete, replace all caps, lids and covers, It is important
to document maintenance events on the Inspection and
Maintenance Log.
Header System Maintenance:
If maintenance is required, use a high pressure nozzle with rear
facing jets to wash the sediments and debris into the diversion
manhole. Use the vacuum hose stinger nozzle to remove the
washed sediments from the sump of the diversion manhole. It is
important to not flush sediments into the chamber system during
the maintenance process.

Containment Row" Maintenance
If maintenance is required, a JetVac truck utilizing a high pressure
nozzle (sledge dredging tool) with rear facing jets will he
required. Insert the nozzle from the diversion manhole into the
Containment Row through the inlet pipe. Turn the water feed
hose on and feed the supply hose until the nozzle has reached
the end of the Containment Row. Withdraw the nozzle slowly.
The tool will backfiush the Containment Row forcing debris into
the diversion manhole sum{. Use the stringer vacuum hose to
remove the sediments and debris from the sump of the diversion
manhole. Multiple passes may be required to fully cleanaut
the Containment Row. Vacuum out the diversion manhole and
remove all debris that may be clogging the drain down orifice.
See Figure 1.
Figure 1— Containment Row shown with high pressure cleaning nozzle
Inspection & Maintenance Log Sample Template
ChamberMaxx Location:
Date ❑epth of Accumulated Name of Maintenance Performed/Notes
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•:r � =� . T � / '.� '.. PRE-ECTIQN
FENCE -YP.]
- • r..�' ,�[� ' 1\ f I �.` 4 LEVEL SFREACER CONSTRUCTION VOTES:
aN, � �,: �i 4 A ^O DA_ C ALL SG5,0. R ALL OF THE SITE IN
/ BAS!4S AN, W"H C5.0. REMOVE THE $EOIMENT
��' /lr _,•. BA5'N5 AN, THEN BEGIN LEVEL SPREADER
CONSTR•JC-ION.
I' / 2; _EVEL SPREADER CDNCRETE UP MUST BE A-
� ff _ 31CRETEN TON R SLOPE OF DR (LEVEL) AND 3"-6" ABOL'E SOIL I
' '� 4 ,. I„ �'1 AR_A q3 S) 30' GRASS FILTER STRIP:
�..\ ....r°> STORM' _-- 7C4
\ r r J -< ..., �1• _�jl +�L , / "t I I xSP)
MININILIm 8' DR501_Ysi7 MUST BE SODDED TALE FEECJE
-19RIGE FOR 3 WEEKS
AFTER IY$iRL_AiIDN
SICRH
I IFVFI SPRFA']FR MAIN-FNANCF \0TF7S
.'.)U I_I_II..-...r1
+
G SYSTE
FOREBAY \
C2.4 SPRE�,DER
IN[ TO w N
ACTION
FRE°LIENV
RENIGVE SEDI MEW AND DEAR FROM
TWICE PERPEAR
FOREBAY AN D BENIN D LIP
REM]VE LARGE STEMMED VEGETATION
ONCEPERYEAR
%AOMLEVELSPRERDER
Rp'NDVE TREES THAT HAVE FALLEN ON
AS NEEDED
UVELSPR.EADER
IN SPELT AND REPAI R LEY EL SP READER
,NSPKTWONTHL
RFPAIR AS N EEDE
I115FECTAND NEPA•RRIPARiAN BJFFEFL+
,N$PECT IADHTHL
VFSAN 09YPaG5 LHANN4L
REPAI0. AS NEE➢E
N%IJlING VI S AND OTHER'
RS NEEDED
'RE— STORMIF: '' ON -TE FLUME 'TALL FES:uE VOW TO 26-3-S"
SYST�.M\ .. �, $EEETAILI66'�
L T �~C--�-f—�� er Le: s•.sxo-
12 NE' Cl1-_E` - o in o `B
\ .. \ _ y... - 7 LEGEND
+ \ \' 59 , LF LAVE. ' � � '
\ \�'RF ADER, LIP CGS I;. ___________
--- \\ 29970 \ \ ,�?F,�'(L±IM1Ca'. �/ _-_____-- UNE
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41
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a4 k5„S I
' �' G3.Z \ PROPOS,ED -° \y�
1 A .F � '� .. <``. 75 -...! •'- - — � . •
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l / , 61 ^ ^ ^ ^ �i I? i' MH,:�A iJ.iJ
..
i
F I�
� �^ I� as
oRa N
•­ I PLAN FOR
RECOC/ii] 5 ME=Er7`—�= .._.. Wr,,.wim. _----- w.:��
A N�S�T F ^ _V._ RTFI SIDE
1 \ I`'•.• _ PERFORA I E C3.3
'q SCHEDU�_ 40 P1 AT/J3 . SEE F /
RIPRAP APRON oco! PnAeEne. �1
\_7"• ego 6Br

PLAN.. VIEW
ig
VAPI�unu2 �i�iP�'nW
gLGIIVILg..A IHROUGH HDROP INLEIv "e
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iELs as AND
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nave wvex vv MATTER eolL aE Le x
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CL-CESEN WRMaNENTa, REFER To NE xanP cnun
NURLArvTLHIM $DSCANC PUN LAJeD-S"
inRM$T[xAAuCP11
ANaMCAABIIM. NI BE PLACED
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B ENOINEER Of RECORD,
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ND¢ eH P... SEE
BRADDII RVI.eei FOR NEW ROOF D.... DRAG- m
1 BIORETENTION AREA
..., .H x.r.
°:EE 1ETAILc...
- :7
8 CONCRETE FLUME SECTION
3.E reAUH x.+.R aeewen'miBen.,r,wo
6I0-RETENTION AR_A - CONS`7l.CTION SEQUENCE
,. RauRl aRAaE ,aE eq- �rnar —A] re
S wsyou E—ATO�IC {AM
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v, r,R- vn,N n ]..D. w., MA -e EEvn-s As s,oR�
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- rq Pe_" eiSlvlCAn— AMC—CR TO HE-Aua�uA
a WAIL AM,$ 4 YD'AT 'NRDueneSn THE PLA S AI-
3 CONSTRUCTION SEQUENCE FOR BI RETENTIOONNPAREAL
SIO-RETENTI N DAT TAB Dom
93;. »i.m TIT NO
M.
]Dn.e] i aW00 O43[D __
lee d-P2] eaiW Y11.Oa ]� RN.
4 BI O•R ETENTION DATA TABLE
C3. u N.Tr. vPvv.IC PSTAL.eeA,A-Tr,..P,w
2 MAINTENANCE SCHEDULE FOR SIO-RETENTION AREA
3• R..E vva,..rP.TAa.DA..Ro-x�r,rw
DESCRIPTION METHOD I
PREMENCY TINE OF YEM
SOIL
SJA.
r
ORGANIC
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e
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A%
LAYEI B -,ER
ro==°�
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12 STORMTECM SYSTEM LAYOUT
'J• %M THIS SYSTEM OR AFFRGMED EGUR4. SUCK AS CHAMBERMA=, STORNRRAP, ETC.
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STORMWATER OPERATIONS AND
MAINTENANCE PLAN
for
Dickerson Court Bioretention
Chapel Hill, NC
PIN: 9789929369

BIORETENTI
N
'gyp
PLAN A. BIORETENTION OVERFLOW WEIR
RM a
VIEW PERPENDICULAR TO BERM AND FLOW
PATH
Dow (E—
/.... ', DOTTory aF DIORETErvTI
s-s»- o
� AREA
/
s�aE acz
v olEDvse. xary /0a
DRLEr uaN• DPo61ED
o ERDRnI.
/
00 0�
0 00
97.11' See o n sheet 5
ELEV. _ oo/ ✓ o0
SO
_ i oc oc
DO
oo A
o
oc
43P LE 4" SOUB RDPE
—� P E
30 FT TRAPEZOIDAL
SWALE (DETAIL A)
,,,,,,, ,,, ,
l •mot I f �
r �� i
:II
PAVEMENT vgLL DE RAISED
(NOT IN SCOPE OF WORK)
sqe uqd—. qqa ounet
so-ugrure Det II 6 ( eetr •
7) 7
Exi nq CurD Inlet Box
Tree to be removed
Bermuda Sod
REQUIRED MATERIALS
•
1122 SF BIORETENTION
•
125 CY FILL MEDIA
•
5 CIF No. 4 STONE
•
14 CY PURE WASHED SAND
•
7 CY ASTM No. 8 STONE
•
21 CY ASTM No. 57 STONE
—� 1.o' — —{ 1.0 3'1 Post
13.1
surface
(980,)
960,
T 4"x4" Posts
Weir elevation
(97.67')
2 pods deep below
�urta�e ur Droretagwq
Lag bolts
Note: Screw 44 together
with stainless steel screws
WEIR AND BERM SECTION VIEW
Elev: 95.0' We neo
El- 94.67'— —
3,1 g\oPe -
Su face of b oret-t- basin
(Elev: 93.67) Light armoring for
erosion control
Side view of weir in berm
NOTES
1. The weir is constructed by stacking pressure treated lumber.
2. Weir structure shall be installed level o
a 6" minimum compacted depth of coarse
sand bedding. BOckfill and grade adjacent areas.
3. Filter fabric shall be Mirafi 18ON or equal.
North Carolina State University
Biological and Agricultural Engineering
NC5U Box 7625 I Raleigh, N.C. 27695
PROP05ED CONSTRUCTION
Dickerson Court Bioretention Retrofit
Dlcker5on Ct.
Chapel hill, NC 275 14
Page Number
4 of
Designed By: ARAEDate:
Reviewed By: RJW, WFH
1 1 , 201 2
Scale
1 rr = 4 ft

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(so)
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IL

Stormwater Operation and Maintenance Plan
BIORETENTION CELL
Regular inspection and maintenance are necessary to preserve long-term functionality of Stormwater
Control Measures "SCMs" per the original design intent. This Plan outlines the Town of Chapel Hill
requirements for regular inspection and maintenance of Bioretention Cell SCMs. The Owner as defined
in the Agreement shall keep a copy of this Stormwater Operations and Maintenance Plan, the SCM
Inspection and Maintenance Log, and a copy of the approved As -Built Plans in a known set location and
made available to the Town of Chapel Hill upon request.
Annual inspections shall be performed by a qualified licensed Professional Engineer or Landscape
Architect. Routine maintenance and inspection shall be performed by a qualified professional with
NCSU Stormwater Inspection and Maintenance Certification or similar certification.
The qualified professional shall maintain a SCM Inspection and Maintenance Log and make available to
the Town of Chapel Hill upon request. All inspections shall be recorded in the log according to the
frequency in the Inspection and Maintenance Table (Table 1 below) and within 24 hours after storm
events that exceed 1.0 inch of rainfall. Any deficit SCM elements noted during inspection shall be
recorded in the log and immediately corrected, repaired, or replaced. All routine and
corrective/emergency maintenance activities shall be recorded in the log. The log template can be
found at the Town of Chapel Hill Stormwater Control Measures website.
An Annual Inspection and Maintenance Report shall be submitted to the Town of Chapel Hill
Stormwater Department. The report shall detail the status of the SCM and maintenance performed as
outlined in the SCM Inspection Report Guidelines. A copy of the annual report shall be submitted to the
Town of Chapel Hill Stormwater Management Division beginning one year after issuance of the
Certificate of Occupancy.
REQUIRED INSPECTION AND MAINTENANCE TASKS FOR BIORETENTION CELL
NOTE: The following inspection and maintenance table is not an exhaustive list of inspection and
maintenance tasks. It is the responsibility of the professional inspecting the facility to perform
comprehensive maintenance for the SCM to be operational.

Table 1: Inspection and Maintenance Provisions for Bioretention Cell
OF
MAINTENANCE ACTIVITIES
INSPECTIONSFREQUENCY
• Watering is needed twice a week until the plants become established (commonly
Upon
6-8 weeks) and then as needed during first growing season (April -October),
construction
depending on rainfall.
completion
• Remove and replace dead plants.
• Remove any tree stakes or wires six months after planting.
• Mow any bioretention with turf cover to a height of approximately six to eight
inches and remove grass clippings.
Once every
• Check inlet, collection system and outlet device for clogging. Remove
accumulated grit, leaves, debris and any other obstructions and dispose off -site.
quarter
. Inspect for ponding and bare or eroding areas and make adjustments as
necessary.
• Remove trash and/or debris from the bioretention area.
Twice during
the growing
• Pull out weeds and dead, diseased, or invasives plants preferably by hand.
season
• For bioretention areas without turf cover, supplement triple shredded hard wood
mulch in devoid areas to maintain a maximum 3 inch layer.
• Prune trees and shrubs to best professional practice. Thin vegetation so that
Annually
sunlight can penetrate the bioretention surface.
• Inspect the observation/cleanout wells to ensure that the underdrain is
functioning. If clogging has occurred, wash out the underdrain.
• Inspect all structural elements.
• Conduct a soil test for pH and heavy metals and determine the infiltration rate.
• For bioretention areas without turf cover, remove and replace the mulch layer
Once every
with triple shredded hard wood. The ideal time to reapply mulch is in the late
2-3 years
spring.
. An extensive replanting is required if 50% minimum coverage throughout the
basin is not achieved in the bioretention after the second growing season.
Once every 5
• Perform facility "make -over" to maintain intended landscaping regime and
to 7 years
address any maintenance problems detected during routine inspections. After 5
growing seasons, the vegetation should achieve 75/ coverage.
Vegetation
As Needed
• If the bioretention cell suffers from dead or diseased plants or overgrown with
(Typical
invasive species, evaluate the source of the problem: soils, hydrology, species,
Problems)
and/or type of disease to determine the cause of the plant failure.
o Remediate the problem by selecting new species and/or implementing an
eradication plan for invasives.

o Ensure appropriate plant maintenance is occurring.
o A one-time fertilizer application to establish ground cover is permissible if
a soil test indicates it is necessary. No portion of the dry detention system
shall be fertilized after the initial fertilization that is required to establish
the vegetation.
o Consult with the Town of Chapel Hill Stormwater Management Division
before any aquatic herbicide is used and site specific approval is given.
• If vegetation coverage is not achieved, add reinforcement planting to maintain
desired vegetation density and/or split out perennials to increase plant cover.
Desired vegetation coverage is 50% after 2 growing seasons and 75% after 5
growing seasons
• Remediate bare soils or erosive gullies.
o In perimeter areas, regrade the soil to remove the gully, plant a ground
cover and water until it is established. If soil test shows that the pH has
dropped, dolomitic lime shall be applied as recommended.
o Within the pretreatment area, provide erosion control devices such as
reinforced turf matting or riprap to avoid future problems with erosion.
Filter Media Failure
• If the bioretention area shows signs of clogging, identify source of sediment and
work to remediate or eliminate it before proceeding with the following
maintenance tasks.
o Flush the underdrains and capture any sediment before it enters any
downstream stream or storm drain system.
o Conduct one or more test pits to determine the depth of soil
contamination.
o Before remediating the filter bed, remove and temporary store any plants.
o Remove the accumulated sediment to the point where sediment is no
longer observed in the soil media plus an additional 2 inches of soil. Either
replace with new media or till 2 to 3 inches of sand into the upper 8 to 12
inches of soil.
o Dispose of any removed soil in an appropriate off -site location.
o Replant and mulch the area of disturbance.
• If soil test shows that the pH has dropped, dolomitic lime shall be applied as
recommended.
• If the soil test shows that heavy metals have accumulated, the toxic soils shall be
removed, disposed of properly, and replaced with new planting media.
Structural Integrity
• Replace or repair any cracked, separated or damaged inlet pipes, drop inlets,
overflow structure, outfalls, impoundment walls or other structural elements.
Functionality
• If flow is bypassing the pretreatment area, regrade to route all flow to the
pretreatment area.
• Sediment Accumulation
o Maintain stable ground cover in the drainage area.

o Sweep or vacuum sediment on pavement in the contributing drainage
area.
o If sedimentation or clogging is occurring in the inlet, design modification
may be needed to ensure adequate drop or slope between inlet and filter
bed.
o If sediment has accumulated in the forebay area or basin reducing its
depth to 75% of the original design depth, remove the sediment,
restabilize the area, and replace with clean rock. Search for the source of
the sediment in the drainage area and remedy the problem if possible.
• If greater than one feet of localized bed sinking and/or sediment is observed by
the underdrain or overflow, conduct a test pit excavation by hand to examine
subsurface conditions. Look for sediment across layers, discoloration, voids, loss
of material. Cause of bed sinking may be breached material layers, poor
connections, or damaged pipes. Repair the test pit to full functionality without
cross contamination of the individual material layers.
For additional information or if damage has occurred at the outlet which effects the
receiving water, contact the Town at Chapel Hill Stormwater Management at 919-
969-7246 (RAIN).

STORMWATER OPERATIONS AND
MAINTENANCE PLAN
for
Fire Burn Building
Chapel Hill, NC
PIN: 9871800325

BUILDING 1:
FOREBAY
FOOTPRINT: 40' X 24'
ELEV.(FT):
AREA (SQ.FT):
FLOOR AREA:
489
142
LEVEL 1: 960 SQ. FT.
488
70
W E LEVEL 2: 640 SQ. FT.
487
23
LEVEL 3: 320 SQ. FT.
486
2
HEIGHT: 47'-91"
MAIN POOL
BUILDING 2:
ELEV.(FT):
AREA (SQ.FT):
FOOTPRINT: 8'X30'
489
535
FLOOR AREA: 240'
488
384
HEIGHT: 11'-6"
487
258
486
156
Approved Revised plans D09RY
°
7.30.19
ELEV.(FT):
AREA (SQ.FT):
490
154
By Jake Lowman
491 492
2009 2009
PRELIMINARY PLAT
NOT FOR RECORDING, SALES
OR CONVEYANCE.
THIS DOCUMENT WAS PREPARED FOR
ILLUSTRATION PURPOSES ONLY.
FOR FURTHER INFORMATION:
CONTACT THE ENGINEER/SURVEYOR
AS NOTED.
N/F
TOWN OF CHAPEL HILL
DS 3460 PG 544
PB 97 PG 162
PIN: 9871-81-0744
STORMWATER DRAINAGE
EASEMENT -LINE TABLE
Line #
Direction
Length
Line #
Direction
Length
L1
NO' 02' 50"W
2785
L10
S4' 5148"W
14.00
L2
S89' 46' 03"E
72.32
L11
N85' 02' 59"W
9.00
L3
N29' 31' 28"E
17.17
L12
S47' 02' 36"W
28.04
L4
N10' 37' 26"E
87.40
L13
S82' 14' 54"W
49.58
L5
N32' 59' 48"W
51.89
L14
S10' 34' 03"W
65.82
L6
N67' 21' 08"E
53.30
L15
S29' 31' 28"W
26.20
L7
S79' 19' 36"E
40.89
L16
N89' 46' 03"W
67.29
L8
S26' 57' 01"E
47.67
L17
SO' 02' 50"E
15.79
L9
S85- 02' 59"E
4.49
L18
S89- 56' 29"W
12.00
47' 00"E 1117.70' TOTAL
__________________
1
_
_____________________t_____________________________________________
1058.88
P--------
_
-------- -------- -------- ------
-_
__----------
------ __---- -------------------
----------------- ___--____-_-__-_-_-_-_-___-__-____
11' S OLAR SETBACK LINE
,
v
ZONE 01-1
MAX BLDG HEIGHT 60'
24' STREET, 8' INTERIOR, 11' SOLAR SETBACK
n
LIMITS OF DISTURBANCE
N/F
IMPERVIOUS SURFACE RATIOS: .5/.7
x 20' WIDTH RESERVED FOR FUTURE
(SEE NOTE ])
TOWN OF CHAPEL HILL
DP8
MAX FLOOR AREA: .264
.'
AREA
-
------___
AREA BUILDING 1: 960 SQ.FT.
mi
�GREENWAY
-------
I-
PIN: 9871-80-0325
AREA BUILDI4882PGG145
NG 2: 500 SQ.FT.
�I
AREA OUTSIDE OF ROW: 9.275 ACRES
AREA IN ROW: 0.280 ACRE +/-
PROPOSED LANDSCAPE
E SWALE TO FOREGAY
AREA N RAILROAD ROW: 0.530 ACRE
m
TREE PROTECTION
FENCE SEE DETAIL
I
TIMBER BORDER
I
N/F
iv
ON SHEET 3/3)
/)
/'�'
\
NET POND
PROP. ED(NCERVIOUS GRAVEL SITE: 19,877 SQ.FT.
TO OB CHAPEL
i
FMEE ENCE
FENCE SEE DETAIL
(SEE
(SEEGRAD WET PONDDETAILSSHEET
EAS OF BLDGSON
7HILL
DB
-
AND WET POND NOTES ON SHEET 3/3)
PROPOSED GRAVEL DRIVE AREA OFF SITE. 960 SQ.FT.
IN
80 PG
SILT FENCE
PROPOSED AREA OF LAND DISTURBANCE: 34,665 SQ.FT. +/-
to
PED B
PG 154
PIN: 9871-80-91az
(SEE DETAIL ON
---.f
SILT FENCE
(SEE DETAIL ON
(6,653 SQ.FT.+/-(INCLUDES TREE REMOVAL) +
I�
SHEET 3/3)
--
SHEET 3 3
/)
6, 573 SQ.FT. +/-(WET POND) + 21,439 SQ.FT.)
IN
17
TREES TO BE REMOVED:
F.
_\
- - - -
1. 1 - 12" DOUBLE ALANTHUS TREE
lm
it
I PROPoseD uNo
DISTURBANCE
AREA
f'1
ffi
Mp.
Cs
�
\
SILT FENCE OUTLET (TYP.)
�� \ \ SHEET 3
\ ( /)
XIS
2. 1 - 15" DEAD ALANTHUS TREE
TREE
3
9" CEDAR
4. 2 J" CEDAR TREES
RW /f#}
I
e
��j
�PEAB
5. 6 - r & 9" PINE TREES
Ipo
2
PROPOSED
'yi 1
6. 3 7', 7' & 6' DOGWOOD TREE
P
TRAINING PAD u6
ui
•s.
SEPTIC TANK
-
ADDITIONAL SMALL BRUSH TO BE REMOVED IN LAND DISTURBANCE
AREA I
�w�
w
e?FW
CONCRETE PAD
STREET FRONTAGE:
QI
NTH VERTICAL PIPE .Pq9`
MILLHOUSE ROAD - 389.42' (ALONG RIGHT OF WAY)
I
�
m
I
GRADE SWALE TO FOREBAY
e �!q
I
ry9. Lrc
-
MROPOSEDS Y F
PTORMWATER FACILIT
AINT NANCE AND ACCESS EASEMENT
50' RCD BUFFER
I
�Sh0y.O
_ _
(8907 SQ.FT.)
SETBACK LINE
m
$�5$2914_113265 TOTAr
1 _
__________rt ____T_T_____________�____
_ _ - _ _ _ -
_____ ______
_ _ __
___________________________,I
_
1072.66'
9
N89'}5'1nr1E
_I---------
-- r 1p
I TRANSIT SIGN
CONSTRUCTION ENTRANCE
_ ---- INSTALL 20 CONCRETE DRIVE PER DETAILS
u I
I r (SEE SHEET 3/3). ALSO SEE NOTE 8-
ACCESS ROA
-
III
I TgANSIT __---- LINETYPE LEGEND
HATCH LEGEND
-- PROPERTY LINE
RESERVED FOR FUTURE
I .p, _ _ _ _ _ = = = =- PROPERTY COMPUTED BY DEED
G EA
PROPERTYINE
I <I ADJOINING PROPERTY LINEITIE
SYMBOL LEGEND
LEGEND
STORMWATER DRAINAGEEASEMENT
/ N/F
®EIPP El I STING IRON PIPE
------------- CONCRETE CURB AM. GUTTER
TOWN OF CHAPEL HILL FENCE
®EIR - E%ISTNG IRON ROO
DB 3092 PG 463 _ _ _ _ _ RIGHT OF WAY LINE
PIN: 9870-89-0971
SETBACK LINE
A CM - CONCRETE MONUMENT
+ CP - COMPUTED POINT
---------------- PROPOSED GRAVELUNE
® POWER POLE
STREAM
'd LIGHT POLE
TOP OF BANK(TOS)
• - GRATE INLET
60 0 60 120 180 30' POWER EA5EMENT(1VP.)
TREE LINE
- REINFORCED CONCRETE PIPE
Q] - FLARE. END SECTION
®-SANITAPV SEWER MANHOLE
1" = 6O' - - - - - - -SILT FENCEISTURBANCE
SIGN
SWALE
$ -HYDRANT
NOTES: TREE PROTECTION FENCE
- WATER VALVE
1. THIS SURVEY WAS PERFORMED WITHOUT THE BENEFIT OF A TITLE REPORT.THIS PROPERTY IS SUBJECTED TO ANY$VON FACTS OR EASEMENT$MICH MAX BE DISCOVERED BY A FULLAND ACCURATE TITLE SEARCH.0
- TREE TO BE REMOVED
2. UNDER GROUND UTILITIES WERE NOT LOCATED ON THIS SURVEY. ANY SUCH UTILITIES SHOWN SHOULD BE CONSIDERED FOR ILLUSTRATION PURPOSES ONLY.
® - TREE STUMP TO BE REMOVED
3. ALL DISTANCES ARE HORIZONTAL GROUND DISTANCES UNLESS OTHERWISE SPECIFIED. AREA CALCULATED BY COORDINATE METHOD.
4. BOUNDARY COMPUTED PER PB 76 PAGE 145, "PROPERTY SURVEYED FOR STANLEY E. & CLEMENSTENE NUNN,- DATED 12/3/19%
NOMENCLATURE
5. POSSIBLE DEED GAP SHOWN PER PIS 91-116,'PROPERTY OF WALTER AND ANNIE EVERETT A PORTION OF WHICH WAS SURVEYED FOR THE TOWN OF CHAPEL HILL ASA RECOMBINATION WITH ADJOINING TOWN PROPERTY;
PB-PLAT BOOK
DATED 212S/2W2 AND REVISED 1W17/2002.
6, INITIAL 20' OF THE DRIVEWAY WILL BE PAVED WITH ASPHALT. SEE DETAIL E-1 ON SHEET 3/3.
DB- DEED BOOK
RAN RIGHT OF WAY
7. ALLDISTURBED AREA ON SITE SHALL BE STABIUZED WITH SEED AND STRAW WITHIN 14 DAYS OF LAND DISTURBANCE.
NT.S.-NOTTOSCALE
`CONTRACTOR SHALL SCHEDULE A PRE -CONSTRUCTION MEETING WITH THE TOWNS STORMWATER MANAGEMENT DIVISION PRIOR TO LAND DISTURBANCE ON SITE.
N/F- NOW OR FORMERLY
SQ.ET.-SQUARE FEET
NTE AUDP­
6902 MILLI ROAD0
CHAPEL RILL, NC
Town of
ENGINEERING AND DESIGN SERVICES
e
RPB ]e-145
PBB054
PB
6902 MILLHOUSE ROAD
9 116
�B4B02z`0
D83092J63
SITE PLAN FOR
DB 352-1
DB262'3"
PROPOSED BURN BUILDING
CHAPEL HILL TOWNSHIP, ORANGE COUNTY NORM CAROLNA
uEr'Y JAMES W. HUGGINS, PLS
1" = So,
e. 04/24/2019
- 9871-80-0325
Icn Moo
Pnwzwe
was JYM/WAM
DREBURNBUILDING.DWG SHEET 1/3
reran wxTOM OF CHAPEL HILL
vnen roa
405 MARTIN LUTHER KING JR BLVD
OWNER
CHAPEL HILL, NC 27514
SHEET 1/3

Applicable to SCM#1
Stormwater Operations and Maintenance Plan
SAND FILTER
Regular inspection and maintenance are necessary to preserve long-term functionality of Stormwater
Control Measures "SCMs" per the original design intent. This Plan outlines the Town of Chapel Hill
requirements for regular inspection and maintenance of Sand Filter SCMs. The Owner as defined in the
Agreement shall keep a copy of this Stormwater Operations and Maintenance Plan, the SCM Inspection
and Maintenance Log, and a copy of the approved As -Built Plans in a known set location and made
available to the Town of Chapel Hill upon request.
Annual inspections shall be performed by a qualified licensed Professional Engineer or Landscape
Architect. Routine maintenance and inspection shall be performed by a qualified professional with
NCSU Stormwater Inspection and Maintenance Certification or similar certification.
The qualified professional shall maintain a SCM Inspection and Maintenance Log and make available to
the Town of Chapel Hill upon request. All inspections shall be recorded in the log according to the
frequency in the Inspection and Maintenance Table (Table 1 below) and within 24 hours after storm
events that exceed 1.0 inch of rainfall. Any deficit SCM elements noted during inspection shall be
recorded in the log and immediately corrected, repaired, or replaced. All routine and
corrective/emergency maintenance activities shall be recorded in the log. The log template can be
found at the Town of Chapel Hill Stormwater Control Measures website.
An Annual Inspection and Maintenance Report shall be submitted to the Town of Chapel Hill
Stormwater Department. The report shall detail the status of the SCM and maintenance performed as
outlined in the SCM Inspection Report Guidelines. A copy of the annual report shall be submitted to the
Town of Chapel Hill Stormwater Management Division beginning one year after issuance of the
Certificate of Occupancy.
REQUIRED INSPECTION AND MAINTENANCE TASKS FOR SAND FILTERS
NOTE: The following inspection and maintenance table is not an exhaustive list of inspection and
maintenance tasks. It is the responsibility of the professional inspecting the facility to perform
comprehensive maintenance for the SCM to be operational.

Table 1: Inspection and Maintenance Provisions for Sand Filters
Upon
completion of
• If a pretreatment grass filter strip has been built, water twice a week until the
construction
grass become established (commonly 6-8 weeks), depending on rainfall.
• Maintain any grass at the perimeter of the sand filter to a height of
approximately six to eight inches.
Once every
• Check inlet, outlet, and conveyance system for any obstructions or clogging.
Remove accumulated grit, leaves, and debris and dispose off -site.
quarter
• Remove any trash present on the sand filter surface.
• Inspect for prolonged ponding and bare or eroding areas and make adjustments
as necessary.
Twice during
the growing
. Remove any vegetation growing on the surface of the sand filter preferably by
hand.
season
Annually
• Skim the first inch of sand media.
• If a sedimentation chamber is present, pump out oil and grit.
Structural Integrity
• Replace or repair any cracked, separated or damaged inlet pipes, outfalls, or
other structural elements.
• Remediate bare soils or erosive gullies by regrading the soil to remove the gully,
plant ground cover and water until it is established.
• If erosion has occurred within the forebay or pretreatment area, provide
additional erosion protection such as reinforced turf matting or riprap.
Functionality
• Sediment Accumulation
As Needed o Maintain stable ground cover in the drainage area.
(Typical o Sweep or vacuum sediment on pavement in the contributing drainage area.
Problems) o If sediment has accumulated in the pre-treatment area to a depth greater
than six inches, remove the top few inches of drainage media and dispose of
it in a location where it will not cause impacts to the SCM or a stream.
Search for the source of the sediment in the drainage area and remedy the
problem.
• Filter Media Failure
o If water is ponding on the surface for more than 24 hours after a storm
event, check to see if the underdrain collection system is clogged and flush
if necessary. It water still ponds, remove the top few inches of filter bed
media and replace. If water still ponds, consult an appropriate professional.
All the sand filter media may need to be replaced.

For additional information or if damage has occurred at the outlet which effects the
receiving water, contact the Town at Chapel Hill Stormwater Management at 919-
969-7246 (RAIN).

Applicable to SCM#2
Stormwater Operation and Maintenance Plan
WET POND
Regular inspection and maintenance are necessary to preserve long-term functionality of Stormwater
Control Measures "SCMs" per the original design intent. This Plan outlines the Town of Chapel Hill
requirements for regular inspection and maintenance of Wet Pond SCMs. The Owner as defined in the
Agreement shall keep a copy of this Stormwater Operations and Maintenance Plan, the SCM Inspection
and Maintenance Log, and a copy of the approved As -Built Plans in a known set location and made
available to the Town of Chapel Hill upon request.
Annual inspections shall be performed by a qualified licensed Professional Engineer or Landscape
Architect. Routine maintenance and inspection shall be performed by a qualified professional with
NCSU Stormwater Inspection and Maintenance Certification or similar certification.
The qualified professional shall maintain a SCM Inspection and Maintenance Log and make available to
the Town of Chapel Hill upon request. All inspections shall be recorded in the log according to the
frequency in the Inspection and Maintenance Table (Table 1 below) and within 24 hours after storm
events that exceed 1.0 inch of rainfall. Any deficit SCM elements noted during inspection shall be
recorded in the log and immediately corrected, repaired, or replaced. All routine and
corrective/emergency maintenance activities shall be recorded in the log. The log template can be
found at the Town of Chapel Hill Stormwater Control Measures website.
An Annual Inspection and Maintenance Report shall be submitted to the Town of Chapel Hill
Stormwater Department. The report shall detail the status of the SCM and maintenance performed as
outlined in the SCM Inspection Report Guidelines. A copy of the annual report shall be submitted to the
Town of Chapel Hill Stormwater Management Division beginning one year after issuance of the
Certificate of Occupancy.
REQUIRED INSPECTION AND MAINTENANCE TASKS FOR WET POND
NOTE: The following inspection and maintenance table is not an exhaustive list of inspection and
maintenance tasks. It is the responsibility of the professional inspecting the facility to perform
comprehensive maintenance for the SCM to be operational.

Table 1: Inspection and Maintenance Provisions for Wet Pond
Feutliji
OF
MAINTENANCE ACTIVITIES
INSPECTIONS
Upon
• Watering is needed twice a week until the plants on the vegetated shelf and
completion of
perimeter of the basin become established (commonly 6-8 weeks), depending
construction
on rainfall.
• Mow grass surface areas to a height of approximately six to eight inches and
remove grass clippings.
• Check inlet system/forebay and outlet device for any obstructions or clogging.
Once a quarter
Remove accumulated grit, leaves, and debris and dispose off -site.
• Remove any trash within the pond area.
• Inspect for ponding and bare or eroding areas and make adjustments before the
next rainfall as necessary.
Twice during
the growing
• Pull out dead or diseased plants, weeds, or invasives preferably by hand.
season
• Have the embankment inspected by a dam safety expert.
• Remove woody species on or near embankment area and maintenance access.
Annually
A dam safety specialist should be consulted to remove any trees.
• Prune trees and shrubs to best professional practice. Thin vegetation so that
sunlight can penetrate the pond surface.
Vegetation
• If the wet pond suffers from dead or diseased plants or overgrown with invasive
species, evaluate the source of the problem: soils, hydrology, species, and/or
type of disease to determine the cause of the plant failure.
o Remediate the problem by selecting new species and/or implementing
an eradication plan for invasives.
o Ensure appropriate plant maintenance is occurring.
o A one-time fertilizer application to establish ground cover is permissible
As needed
if a soil test indicates it is necessary. No portion of the wet pond system
(Typical
shall be fertilized after the initial fertilization that is required to establish
Problems)
the vegetation.
o Consult with the Town of Chapel Hill Stormwater Management Division
If algal growth covers 50% of the area, consult a professional to remove
and control the algal growth.
• If cattails, phragmites, or other invasive plants exceed 50% of the wet pond,
remove invasives by physical removal or wiping them with a herbicide. Consult
the Town of Chapel Hill before any aquatic herbicide is used. Site specific
approval is required. Extended periods of dewatering may be a possible
treatment approach for reducing invasives.

• Remediate bare soils or erosive gullies.
o In perimeter areas, regrade the soil to remove the gully, plant a ground
cover and water until it is established. If soil test shows that the pH has
dropped, dolomitic lime shall be applied as recommended.
o Within the pretreatment area, provide erosion control devices such as
reinforced turf matting or riprap to avoid future problems with erosion.
Structural integrity
• Replace or repair any cracked, separated or damaged inlet pipes, outfalls,
impoundment walls or other structural elements.
• If dam embankment or emergency spillway needs maintenance, consult with a
professional.
Functionality
• Sediment Accumulation
o Maintain stable ground cover in the drainage area.
o Sweep or vacuum sediment on pavement in the contributing drainage
area.
o If sedimentation or clogging is occurring in the inlet, design modification
may be needed to ensure adequate drop or slope between inlet and
filter bed.
o If sediment has accumulated in the forebay area reducing its depth to
75% of the original design depth, remove the sediment off site,
restabilize the area, and replace with clean rock. Search for the source
of the sediment in the drainage area and remedy the problem if possible.
• If there are visible disturbances to the forebay design, make the necessary
repairs to ensure that the forebay is functioning as intended.
• If evidence of a muskrat or beaver activity is observed, contact a professional to
remove muskrat or beaver.
• If the basin must be drained for an emergency or to perform maintenance, the
flushing of sediment through the emergency drain should be minimized to the
maximum extent practical.
For additional information or if damage has occurred at the outlet which effects the
receiving water, contact the Town at Chapel Hill Stormwater Management at 919-
969-7246 (RAIN).

WET POND CROSSESECTION VIEW 1
PEES AND RL.1 sNELw6 NDT LLDw D
TEMPORARY POOL ELEV. = 4913'
NORMALOOL PELEV. = 489'
ry'
FORECAY
< MAIN POOL
TELL ORARY POOL
MAIN POOL
----------------
OF MAII POOL AND IOREGAY
496
492
488
484
GRn
WET POND CROSSESECTION VIEW 2
RISER STRUCTURE OUTLET DETAIL
DRECLIREo;x
1D Rao FOR NaIN ENANDE aDDE55
PLIS
NORMAL POPOOLV, EUE6g
DETAIL)
\, (SEE ETaL)
— v_ECETnm�>nccEs
RCCOYIIIBNpEp BLppE; 3 H :1 y
TN" RACK
FROM AND BACK EMBWNKNW SLOPE
REOIRRED
REWIREOTOBEYEGETATED
SMH
ELAWO) �fICITT
YI WHIM WIDTH10 FT FOR
WNNTENACE ACCESS
PRCPCSED ORAOE13 H ; 3 Y
OIfILET PIPE
r EXISTING GLIDE
DEWATERING METHOD
WET ROWS SHALL HAVE A METH00 TO DFLAW DDYM STANDING WATER TO
FACILITATE MAAdFEKWM AND INSPECTION
LE O. SLIMMER OR PU12PN
WET POND: PROFILE VIEW
0+00
0+25
0+50
0+75
1+00
1+25
1+1I
PROFILE SCALE:
HORIDONTAL 1" 0 200
VERTICAL: 1" 0 100
PRELIMINARY PLAT
NOT FOR RECORDING, SALES
OR CONVEYANCE.
T
H
I
SDPATCH OCONPURPOSEST WAS EONEED FOR
ExcmESP/sUR.EYDR
SHEET 2/3
5'
18" RCP
OURET PIPE
VL in'..• "�;V
1.5'
III L" IF
1. TresM1 rack shell be bolte0 to iM1e nsersVUUure. BORs shall be stainless steel antl ike trasM1 reek sM1all be galvanizetl or paintetl.
2. Riser shuMres wilM1 mulOple Bartel sections shell M1ave gasketletl joints, antl eacM1 section sM1all be bdtetl to etljacent secl'Iens wiN s�ainless steel sVaps.
3. An a�sa M1atcM1 of minimum tlimanaion 2 x 3 feet alignatl will) Me access stapa in 1M1e near slrucWre allall lre provHetl in 1M1a trasM1 rack.
SAND FILTER DETAIL
SAND FILTER PLAN VIEW SECTION AM
2' CxOCIaxG STONE
5 °ft 9 aloR E T�CN SOIL Mt
6' O O
PERPGRgTED Pur
I 057 STONE
C-----�
SECTION BM
J 6' SOLID PVC PIPE
18 RCP
4• PERFORATED -
PVC PAP z CN ST E eioasrtxnox son unpin
+AS1M C-33 OR EWIVALENT �,ygOOR 10
RIDRFTFNT,D A. 7-MEDIA TO COARSE WASH SAND ;57 STOxE�-- -
E.8-10% HAGS (SILT AND CLAY)
G
C. 5-10% ORGANIC MATTER s PERFORATED Pvc alaE s Pvc PiPL
Town of
ENdNEERING AND DESIGN SERMCES
6902 MILLHOUSE ROAD
DETAIL ❑ PROFILE SHEET FOR
PROPOSED BURN BUILDING
CHAPEL HILL TOWNSHIP, ORANGE COUNTY NORTH CAROLINA
n. JAMES W. HUGGINS, PLS
NOT TO SCALE
04/24/2019
- 9871-80-0325
wx n. JM/WAM
PLI xnme FIREBURNBUILDING.DWG SHEET 2/3
>eaTvouN
TOWN OF CHAPEL HILL
vsyso roa
405 MARTIN LUTIER KING JR BLVD
OMER
CHAPEL HILL, NO 27514

STORMWATER OPERATIONS AND
MAINTENANCE PLAN
for
Fire Station #5
Chapel Hill, NC
PIN: 9787271011

LEC-SNP
--
LnLm' POLE
coo aEAH-OUT
INV
- YGB0 YARD LATGR BASIN
•,{ 1(�l __ _- _ �xyW1R� G f FESdada FLAK EW 5EG71ON
Ex. uw - 1, ► Mnp rugl 5JC1 y,� FH2E KYPRAKT
�.vv a• r�
17/6ol RW➢X y mD
MERSECTi�C1JPReIRt7
lase ��srR � NCD07..
a:a/Sna
r � r
PRE -Ex AA 1
ANVY
15-r-5 x SPOIT E.EvAf1ON
TREE PROTEGTK7K
t•LCPIC.'mw OEMPCF-AIAT")
SILT PEIGE f18410RARY)
_.. , T7R� TO E]R F
RH
ep r
�Fr / 1� ( .
,''• NNIN6 /' ! � oniem r: °tea aam wn
W IX
w u
I / PE'' y5W ! •1i -4 eieime 'wiwu w• ' �.n�v
+N4 EC L0116TA+LTW .cGplfiNL
x Se Y0 tlNAU &�AaM�as/PLARP9
NO, aww" roilmU c
1 ] VICE Is t,VV� ., s a;
i 1 ]:1 4q 5_#fq iTe SAE `
/ IpM[PyW T�I krtI
jf ;p Eti ttgxle a nw+xwl��Ev.9vv�
1
,�TT`I'CJF'
V
4 I .w
IawHE {sT ;oMt'� 1
rv,.aiWv
� , G.IvuiLwHc `V ZYLT
+ Rgcx CHOCK ❑A3T
1 RE .c sx
.Fr ' I I
al.I,l 40
LJ
IL
• SEE PLAN SHEET SD15 FOR %L
�c o ao .n eo
me V a w JOINT DETAIL OF CONCRETE DRIVE -
!..--;.
T - •� ALL STORM SIDEWALK AND ROAD IMPROvENEP1T5 _
VR SENNE7 BOAC RIGHT-OF-WAY BY NCOT
ufte au wsrnrwu CONTRACT R-09[2CA
uPSTPFaM ILM"M g,,ypF µad Off smuMw Snu w VPSHeAw wv www. KmPIRA'.lR' D to 0 ,o axe P:� PIPE
nW TC imiEki H'�%1 TM F 91E A { IYPC 0x P!S INJRS iP/PR Oaf N/HP M� C HLLI PPE QRLT mE
t sn-2
G cl& & [I'[i M PLAN
T
f[s /14
1 Oi.WXCT i � -
�
1 ti�H.
~'-- 1 � ` ;+ •max � +. ��
l aNn:.6�If�
11 p� SCM #1 - Wet Pond
... WATER AND SEWER IN THE T ROAD
N:eaeTw Te. .a �,...ncr.00r w.�.r
RHT-OF-WAY TO BE CONSTRUCTED
CTEC BY
KIMLEY HORN PLANS DATED JUNE 30, 2000. ven
• FOR INTERIM GRADING PLAN PRIOR TO NCDOT WORK
OTI BENNETT ROAD SEE PLAIN SHEET SO -PA GRABENG & U711 l'I'Y HI•AN
NO SCALE

Applicable to SCM #1
Stormwater Operation and Maintenance Plan
WET POND
Regular inspection and maintenance are necessary to preserve long-term functionality of Stormwater
Control Measures "SCMs" per the original design intent. This Plan outlines the Town of Chapel Hill
requirements for regular inspection and maintenance of Wet Pond SCMs. The Owner as defined in the
Agreement shall keep a copy of this Stormwater Operations and Maintenance Plan, the SCM Inspection
and Maintenance Log, and a copy of the approved As -Built Plans in a known set location and made
available to the Town of Chapel Hill upon request.
Annual inspections shall be performed by a qualified licensed Professional Engineer or Landscape
Architect. Routine maintenance and inspection shall be performed by a qualified professional with
NCSU Stormwater Inspection and Maintenance Certification or similar certification.
The qualified professional shall maintain a SCM Inspection and Maintenance Log and make available to
the Town of Chapel Hill upon request. All inspections shall be recorded in the log according to the
frequency in the Inspection and Maintenance Table (Table 1 below) and within 24 hours after storm
events that exceed 1.0 inch of rainfall. Any deficit SCM elements noted during inspection shall be
recorded in the log and immediately corrected, repaired, or replaced. All routine and
corrective/emergency maintenance activities shall be recorded in the log. The log template can be
found at the Town of Chapel Hill Stormwater Control Measures website.
An Annual Inspection and Maintenance Report shall be submitted to the Town of Chapel Hill
Stormwater Department. The report shall detail the status of the SCM and maintenance performed as
outlined in the SCM Inspection Report Guidelines. A copy of the annual report shall be submitted to the
Town of Chapel Hill Stormwater Management Division beginning one year after issuance of the
Certificate of Occupancy.
REQUIRED INSPECTION AND MAINTENANCE TASKS FOR WET POND
NOTE: The following inspection and maintenance table is not an exhaustive list of inspection and
maintenance tasks. It is the responsibility of the professional inspecting the facility to perform
comprehensive maintenance for the SCM to be operational.

Table 1: Inspection and Maintenance Provisions for Wet Pond
Feutliji
OF
MAINTENANCE ACTIVITIES
INSPECTIONS
Upon
• Watering is needed twice a week until the plants on the vegetated shelf and
completion of
perimeter of the basin become established (commonly 6-8 weeks), depending
construction
on rainfall.
• Mow grass surface areas to a height of approximately six to eight inches and
remove grass clippings.
• Check inlet system/forebay and outlet device for any obstructions or clogging.
Once a quarter
Remove accumulated grit, leaves, and debris and dispose off -site.
• Remove any trash within the pond area.
• Inspect for ponding and bare or eroding areas and make adjustments before the
next rainfall as necessary.
Twice during
the growing
• Pull out dead or diseased plants, weeds, or invasives preferably by hand.
season
• Have the embankment inspected by a dam safety expert.
• Remove woody species on or near embankment area and maintenance access.
Annually
A dam safety specialist should be consulted to remove any trees.
• Prune trees and shrubs to best professional practice. Thin vegetation so that
sunlight can penetrate the pond surface.
Vegetation
• If the wet pond suffers from dead or diseased plants or overgrown with invasive
species, evaluate the source of the problem: soils, hydrology, species, and/or
type of disease to determine the cause of the plant failure.
o Remediate the problem by selecting new species and/or implementing
an eradication plan for invasives.
o Ensure appropriate plant maintenance is occurring.
o A one-time fertilizer application to establish ground cover is permissible
As needed
if a soil test indicates it is necessary. No portion of the wet pond system
(Typical
shall be fertilized after the initial fertilization that is required to establish
Problems)
the vegetation.
o Consult with the Town of Chapel Hill Stormwater Management Division
If algal growth covers 50% of the area, consult a professional to remove
and control the algal growth.
• If cattails, phragmites, or other invasive plants exceed 50% of the wet pond,
remove invasives by physical removal or wiping them with a herbicide. Consult
the Town of Chapel Hill before any aquatic herbicide is used. Site specific
approval is required. Extended periods of dewatering may be a possible
treatment approach for reducing invasives.

• Remediate bare soils or erosive gullies.
o In perimeter areas, regrade the soil to remove the gully, plant a ground
cover and water until it is established. If soil test shows that the pH has
dropped, dolomitic lime shall be applied as recommended.
o Within the pretreatment area, provide erosion control devices such as
reinforced turf matting or riprap to avoid future problems with erosion.
Structural integrity
• Replace or repair any cracked, separated or damaged inlet pipes, outfalls,
impoundment walls or other structural elements.
• If dam embankment or emergency spillway needs maintenance, consult with a
professional.
Functionality
• Sediment Accumulation
o Maintain stable ground cover in the drainage area.
o Sweep or vacuum sediment on pavement in the contributing drainage
area.
o If sedimentation or clogging is occurring in the inlet, design modification
may be needed to ensure adequate drop or slope between inlet and
filter bed.
o If sediment has accumulated in the forebay area reducing its depth to
75% of the original design depth, remove the sediment off site,
restabilize the area, and replace with clean rock. Search for the source
of the sediment in the drainage area and remedy the problem if possible.
• If there are visible disturbances to the forebay design, make the necessary
repairs to ensure that the forebay is functioning as intended.
• If evidence of a muskrat or beaver activity is observed, contact a professional to
remove muskrat or beaver.
• If the basin must be drained for an emergency or to perform maintenance, the
flushing of sediment through the emergency drain should be minimized to the
maximum extent practical.
For additional information or if damage has occurred at the outlet which effects the
receiving water, contact the Town at Chapel Hill Stormwater Management at 919-
969-7246 (RAIN).

STORMWATER OPERATIONS AND
MAINTENANCE PLAN
for
Hargraves Community Center
Chapel Hill, NC
PIN: 9788171392

s?30 " RCP
�, y....
t 2
O Inspection Point
0 Inlet Structure
> - > Stormwater Pipe
} 1
• Sewer Manhole
❑� Manhole / Junction Box
> > Stormwater Pipe - Less than 15
t
• Fire Hydrant
Misc Structure
Surface Flow
RR r
RR t
�> Sewer Gravity Main
Q Pipe End
Point of Discharge
N Sewer Pressurized Main
@° Pipe In
Oil/Grease Separator
- - - Service Lateral
o Pipes Less than 15
BMP Area
R
— Water Line
:: Underground Junction
Difficult Access Structure
Stormwater Channel
Tree / Wooded Area
ACM 1 - Permeable Pavement
-
-- Stormwater Ditch
Building
30" RCP
Potential Pollutant Source Location Key
L S�
SCM 2 - Bioretention OSP�
O Trash/Recycling Dumpsters
_I 'A`I
_ y
Pervious Fire Lane I L
LA - --- -_ - - --
y�11a,.e«e«, ere
Feet
NI We pFt
OTrash/Recycling Cans (2a-2i)
pPool Pump House
OWash Station
Comment / Notes
Roof / Outdoor Structure
Pervious Surface
0 Paved / Impervious Surface
Q MS4 Facility
Parcels
Pervious Fire Lane
+ Spill Kit Location
Inspection Procedures
In addition to the Potential Pollutant Source Locations
Inspect potential pollution source locations in sequence with numbering on the map identified on the map, the site inspection shall also
Reference the back of this map to assist with identification of pollutant concerns at observe and report:
each location and practices to address potential pollutant exposure to Stormwater Areas of erosion occurring on -site;
runoff. Locations of exposed soils;
Complete the Inspection Form in Appendix III for each corresponding location during Chemical spills;
inspection. Open (uncovered) and unlabeled containers;
Submit completed form to the Facility Manager, SWPPP Operator & SWPPP Any equipment washing outside of designated
Coordinator. area;
Conduct follow-up to findings. Any other potential pollutant that could be exposed
Document Completed Follow-up actions. to precipitation and stormwater runoff.
Place Inspection form in Appendix V of the SWPPP binder. -Inspection of catch basins and storm sewers for litter and
sediment accumulation to BMPs
Town of Chapel Hill
Stormwater Pollution Prevention Plan Map
r Hargraves Community Center and Park R#00 C
Note: This map is required to be updated when any new infrastructure is built (buildings, storm sewer, outfalls, etc.)
or any possible pollutant generating activities are created, moved, or eliminated (new dumpster, etc.)
Notify the SWPPP Coordinator regarding changes in the field not depicted on this map.

Applicable for SCM 1
Stormwater Operation and Maintenance Plan
PERMEABLE PAVEMENT
Regular inspection and maintenance are necessary to preserve long-term functionality of Stormwater
Control Measures "SCMs" per the original design intent. This Plan outlines the Town of Chapel Hill
requirements for regular inspection and maintenance of Permeable Pavement SCMs. The Owner as
defined in the Agreement shall keep a copy of this Stormwater Operations and Maintenance Plan, any
applicable proprietary manufacturer's O&M Plan, the SCM Inspection and Maintenance Log, and a copy
of the approved As -Built Plans in a known set location and made available to the Town of Chapel Hill
upon request.
Annual inspections shall be performed by a qualified licensed Professional Engineer or Landscape
Architect. Routine maintenance and inspection shall be performed by a qualified professional with
NCSU Stormwater Inspection and Maintenance Certification or similar certification.
The qualified professional shall maintain a SCM Inspection and Maintenance Log and make available to
the Town of Chapel Hill upon request. All inspections shall be recorded in the log according to the
frequency in the Inspection and Maintenance Table (Table 1 below) and within 24 hours after storm
events that exceed 1.0 inch of rainfall. Any deficit SCM elements noted during inspection shall be
recorded in the log and immediately corrected, repaired, or replaced. All routine and
corrective/emergency maintenance activities shall be recorded in the log. The log template can be
found at the Town of Chapel Hill Stormwater Control Measures website.
An Annual Inspection and Maintenance Report shall be submitted to the Town of Chapel Hill
Stormwater Department. The report shall detail the status of the SCM and maintenance performed as
outlined in the SCM Inspection Report Guidelines. A copy of the annual report shall be submitted to the
Town of Chapel Hill Stormwater Management Division beginning one year after issuance of the
Certificate of Occupancy.
REQUIRED INSPECTION AND MAINTENANCE TASKS FOR PERMEABLE PAVEMENT
NOTE: The following inspection and maintenance table is not an exhaustive list of inspection and
maintenance tasks. It is the responsibility of the professional inspecting the facility to perform
comprehensive maintenance for the SCM to be operational.

Table 1: Inspection and Maintenance Provisions for Permeable Pavement
FREQUENCY
OF MAINTENANCE ACTIVITIES
INSPECTIONS
Monthly,
• Remove leaves, pollen, trash, and other debris on the surface of the permeable
Biweekly in fall pavement preferably with a portable blower and/or street sweeper.
and spring
• Manually pull out any weeds or vegetation growing in the vegetation trying to
keep as much media in place as possible.
• Inspect the permeable pavements and address any deficiencies. If poor
Quarterly preventive maintenance is the cause of deficiencies, implement plans for better
preventative maintenance to preserve long-term functionality (see below).
• Use a regenerative air or vacuum sweeper to remove accumulated sediment
Yearly at
• Test the pavement surface infiltration rate using the simple infiltration test
minimum
referenced in the NCDEQ Stormwater Design Manual and address any
deficiencies. Please consult with Town staff before infiltration tests are
performed.
Structural integrity
• If there is rutting, cracking, slumping, or other damage on the surface on the
surface, contact a professional.
Functionality
• Sediment accumulation prevention
o Ensure that all contributing areas are stabilized and graded to drain away
from the pavement as much as possible. Plant any bare spots and water
until established.
o Do not stockpile soil, sand, mulch, salt or other materials on the
permeable pavement and cover any stockpiles near the permeable
pavement.
As needed o Lay down tarp on the surface before transporting soil, mulch, or sand
across the permeable pavement.
Problems) (Typical o Do not blow or bag grass clippings or other materials on the permeable
pavement.
o Any construction project that occurs on a site with permeable pavement
must consult with Town stormwater staff.
• Illicit discharge prevention
o Do not wash vehicles parked on the permeable pavement.
o Do not apply herbicides to permeable pavement.
o Do not dump oils or chemicals or allow contaminated runoff to drain to
the permeable pavement.
• Drainage issues
o If water is present in the observation well more than 5 days after a storm
event exceeding 1 inch, flush the underdrain. If the problem persists,
consult the designer or appropriate professional since there may be
clouin in the soil subparade.

If water is ponding or flowing off surface, vacuum sweep the surface and
ensure that the drainage area is not a source of sediment. If the
problem persists, contact a professional.
Winter Activities
• Do not apply sand or deicers on the surface for winter storms.
• Permeable interlocking concrete pavers, pervious concrete, and pervious asphalt
can be plowed like conventional pavements.
• Raise the blade about 1 in. higher than usual when plowing concrete grid pavers
and plastic turf reinforcing grid to avoid damaging them. A rubber strip can also
be applied to the blade to protect them.
• Do not pile plowed snow upon permeable pavement surfaces
For additional information, contact the Town at Chapel Hill Stormwater
Management at 919-969-7246 (RAIN).

Applicable for SCM 2
Stormwater Operation and Maintenance Plan
BIORETENTION CELL
Regular inspection and maintenance are necessary to preserve long-term functionality of Stormwater
Control Measures "SCMs" per the original design intent. This Plan outlines the Town of Chapel Hill
requirements for regular inspection and maintenance of Bioretention Cell SCMs. The Owner as defined
in the Agreement shall keep a copy of this Stormwater Operations and Maintenance Plan, the SCM
Inspection and Maintenance Log, and a copy of the approved As -Built Plans in a known set location and
made available to the Town of Chapel Hill upon request.
Annual inspections shall be performed by a qualified licensed Professional Engineer or Landscape
Architect. Routine maintenance and inspection shall be performed by a qualified professional with
NCSU Stormwater Inspection and Maintenance Certification or similar certification.
The qualified professional shall maintain a SCM Inspection and Maintenance Log and make available to
the Town of Chapel Hill upon request. All inspections shall be recorded in the log according to the
frequency in the Inspection and Maintenance Table (Table 1 below) and within 24 hours after storm
events that exceed 1.0 inch of rainfall. Any deficit SCM elements noted during inspection shall be
recorded in the log and immediately corrected, repaired, or replaced. All routine and
corrective/emergency maintenance activities shall be recorded in the log. The log template can be
found at the Town of Chapel Hill Stormwater Control Measures website.
An Annual Inspection and Maintenance Report shall be submitted to the Town of Chapel Hill
Stormwater Department. The report shall detail the status of the SCM and maintenance performed as
outlined in the SCM Inspection Report Guidelines. A copy of the annual report shall be submitted to the
Town of Chapel Hill Stormwater Management Division beginning one year after issuance of the
Certificate of Occupancy.
REQUIRED INSPECTION AND MAINTENANCE TASKS FOR BIORETENTION CELL
NOTE: The following inspection and maintenance table is not an exhaustive list of inspection and
maintenance tasks. It is the responsibility of the professional inspecting the facility to perform
comprehensive maintenance for the SCM to be operational.

Table 1: Inspection and Maintenance Provisions for Bioretention Cell
OF
MAINTENANCE ACTIVITIES
INSPECTIONSFREQUENCY
• Watering is needed twice a week until the plants become established (commonly
Upon
6-8 weeks) and then as needed during first growing season (April -October),
construction
depending on rainfall.
completion
• Remove and replace dead plants.
• Remove any tree stakes or wires six months after planting.
• Mow any bioretention with turf cover to a height of approximately six to eight
inches and remove grass clippings.
Once every
• Check inlet, collection system and outlet device for clogging. Remove
accumulated grit, leaves, debris and any other obstructions and dispose off -site.
quarter
. Inspect for ponding and bare or eroding areas and make adjustments as
necessary.
• Remove trash and/or debris from the bioretention area.
Twice during
the growing
• Pull out weeds and dead, diseased, or invasives plants preferably by hand.
season
• For bioretention areas without turf cover, supplement triple shredded hard wood
mulch in devoid areas to maintain a maximum 3 inch layer.
• Prune trees and shrubs to best professional practice. Thin vegetation so that
Annually
sunlight can penetrate the bioretention surface.
• Inspect the observation/cleanout wells to ensure that the underdrain is
functioning. If clogging has occurred, wash out the underdrain.
• Inspect all structural elements.
• Conduct a soil test for pH and heavy metals and determine the infiltration rate.
• For bioretention areas without turf cover, remove and replace the mulch layer
Once every
with triple shredded hard wood. The ideal time to reapply mulch is in the late
2-3 years
spring.
. An extensive replanting is required if 50% minimum coverage throughout the
basin is not achieved in the bioretention after the second growing season.
Once every 5
• Perform facility "make -over" to maintain intended landscaping regime and
to 7 years
address any maintenance problems detected during routine inspections. After 5
growing seasons, the vegetation should achieve 75/ coverage.
Vegetation
As Needed
• If the bioretention cell suffers from dead or diseased plants or overgrown with
(Typical
invasive species, evaluate the source of the problem: soils, hydrology, species,
Problems)
and/or type of disease to determine the cause of the plant failure.
o Remediate the problem by selecting new species and/or implementing an
eradication plan for invasives.

o Ensure appropriate plant maintenance is occurring.
o A one-time fertilizer application to establish ground cover is permissible if
a soil test indicates it is necessary. No portion of the dry detention system
shall be fertilized after the initial fertilization that is required to establish
the vegetation.
o Consult with the Town of Chapel Hill Stormwater Management Division
before any aquatic herbicide is used and site specific approval is given.
• If vegetation coverage is not achieved, add reinforcement planting to maintain
desired vegetation density and/or split out perennials to increase plant cover.
Desired vegetation coverage is 50% after 2 growing seasons and 75% after 5
growing seasons
• Remediate bare soils or erosive gullies.
o In perimeter areas, regrade the soil to remove the gully, plant a ground
cover and water until it is established. If soil test shows that the pH has
dropped, dolomitic lime shall be applied as recommended.
o Within the pretreatment area, provide erosion control devices such as
reinforced turf matting or riprap to avoid future problems with erosion.
Filter Media Failure
• If the bioretention area shows signs of clogging, identify source of sediment and
work to remediate or eliminate it before proceeding with the following
maintenance tasks.
o Flush the underdrains and capture any sediment before it enters any
downstream stream or storm drain system.
o Conduct one or more test pits to determine the depth of soil
contamination.
o Before remediating the filter bed, remove and temporary store any plants.
o Remove the accumulated sediment to the point where sediment is no
longer observed in the soil media plus an additional 2 inches of soil. Either
replace with new media or till 2 to 3 inches of sand into the upper 8 to 12
inches of soil.
o Dispose of any removed soil in an appropriate off -site location.
o Replant and mulch the area of disturbance.
• If soil test shows that the pH has dropped, dolomitic lime shall be applied as
recommended.
• If the soil test shows that heavy metals have accumulated, the toxic soils shall be
removed, disposed of properly, and replaced with new planting media.
Structural Integrity
• Replace or repair any cracked, separated or damaged inlet pipes, drop inlets,
overflow structure, outfalls, impoundment walls or other structural elements.
Functionality
• If flow is bypassing the pretreatment area, regrade to route all flow to the
pretreatment area.
• Sediment Accumulation
o Maintain stable ground cover in the drainage area.

o Sweep or vacuum sediment on pavement in the contributing drainage
area.
o If sedimentation or clogging is occurring in the inlet, design modification
may be needed to ensure adequate drop or slope between inlet and filter
bed.
o If sediment has accumulated in the forebay area or basin reducing its
depth to 75% of the original design depth, remove the sediment,
restabilize the area, and replace with clean rock. Search for the source of
the sediment in the drainage area and remedy the problem if possible.
• If greater than one feet of localized bed sinking and/or sediment is observed by
the underdrain or overflow, conduct a test pit excavation by hand to examine
subsurface conditions. Look for sediment across layers, discoloration, voids, loss
of material. Cause of bed sinking may be breached material layers, poor
connections, or damaged pipes. Repair the test pit to full functionality without
cross contamination of the individual material layers.
For additional information or if damage has occurred at the outlet which effects the
receiving water, contact the Town at Chapel Hill Stormwater Management at 919-
969-7246 (RAIN).

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TUFFTRACK PRODUCT PESCRIPTTON
PANEL SIZE - 24" x 24" x 1 1/2"
CELLS PER PANEL - (120) - 2-1/2" HEXAGONAL CEL
NESTED HONEYCOMB CELL LAYOUT
COMPRESSIVE STRENGTH - 98,770 PSF
6B5 PSI
EXCEEDS H2O
LOADING
TUFFTRACK GRASS ROAD PAVER
ACTUAL FINISH GRADE
SOIL FILL LEVEL INSIDE
PAVER GRIDWORK AFTER
HEAVY WATER DOWN.
THIS IS THE ACTUAL SOD
PLANTING LEVEL.
21H
2rTll
TONGUE & GROOVE LATCHING SYSTEM
"SOD" PLANTING LEVELS INSIDE CELLS
/-
�AD]OINING FINISH GRADE
HEAVY VEHICLE BASE MATERIAL J" CRUSHED
NOTE:
EXISTING SOILS SHOULD BE EVALUATED TO ENSURE
PROPER STRUCTURAL AND PERMEABILITY PROPERTIES.
3(4"
8" (MIN.)
TECHNICAL SERVICES
TYPICAL TUFFTRACK PAVER FIRELANE DETAIL 1-HBO-H25-4716
to bse"Ice@ndspm.c m
I IEAVY VEI I)CLE OR FIRE ACCESS ROAD N.T. S.

North Carolina State University
PROPOSED CONSTRUCTION
Hargraves Community Center Bioretention Retrofit
Page Number
Biological and Agricultural Engineering
2 1 6 N. Roberson 5t.
4 of 6
NCSU Box 7625 I Raleigh, N.C. 27695
Designed By: ARA
Date:
Scale
Chapel hill, NC 275 14
Reviewed By: RJ W, WFHE-111
3 1 , 2012
V = 3 ft

Bioretention Cross Section
COMMON BERMUDA
ON 3:1 SLOPES
85
84
83
82
81
O 80
O
� 79
W
78
77
76
75
Exaggeration
H:V = 2:1
FILL MEDIA MIX
85-88% Sand
8-12% Fines
3-5% Organic matter
3" TRIPLE —SHREDDED
HARDWOOD MULCH 79.3
4'' PERFORATED SMOOTH —WALLED
CPP OR PERFORATED PVC PIPE
WASHED 57 STO
ENVELOPE
Underdrain and Outlet Structure Detail B I O R E TE N TI O N FILL
MEDIA SPECIFICATIONS
80.8
• 85-88% SAND
Trash guard (See specs. • 8-12% FINES (CLAY AND SILT)
to right) 3-5% ORGANIC MATTER
Bottom Top of Berm (80.55) P—INDEX FROM 10-30
of Bowl Cleanout 80.703 Existing THE SOIL MIX SHALL BE UNIFORM AND FREE OF
'
(79.3) / 12ID PVC Storm STONES, STUMPS, ROOTS, OR OTHER AGGREGATE
1/ Overflow Network MATERIALS GREATER THAN 2 INCHES DIAMETER.
(80.3) PROOF THAT THESE REQUIREMENTS HAVE BEEN
MET MUST BE DOCUMENTED AND APPROVED BY
PROJECT ENGINEER
IWS
77.703 OVERFLOW STRUCTURE
SPECIFICATIONS
78.048'
Bottom Engineered Soil A 12" Bar Guard from Pond Dam Pi In Ltd.
shall be used as a trash rack
Of Soil 4" Perforated Media on the 1p 12" PVC
PVC or
Media overflow pipe.
(76.55) Smooth —Walled
CPP The invert of the 12" PVC overflow pipe shall
be installed at 80.3' (1' above the mulch
surface layer of the bioretention cell)
�tentinn���le
_ EXISTING GRADE
---------------------
\ \
12" ID SMOOTH PVC RISER
12" ID HOPE Pipe WEIR ELEVATION 80.3
02.181.7
LINED
FOREBAY MEDIA AND MULCH
No. 57 STONE
0+10 0+20 0+30 0+40 0+50 0+60 0+70 0+80 0+89
Station (ft)
North Carolina State University
Biological and Agncultural Engineering
NC5U Box 7625 I Raleigh, N.C. 27695
BIORETENTION DETAILS
Hargraves Hargraves Community Bioretention RetrofitBioretention Retrofit
Page Number
5 of 6
2 1 6 N. Roberson 5t.
Chapel Hill, NC 275 14
Desgned By: ARA
Reviewed By: R.1W, WFH
Date:
MAY31, 2012
Scale:
A5 Noted

Underdrain Installation and Specifications Detail A
Detail C
ALL UNDERDRAINS USED MUST BE CORRUGATED HERE WITH A SMOOTH
INNER WALL. THE DRAINS MUST BE INSTALLED AT THE SHOWN
LOCATIONS AND GRADES. SOLID PIPE MUST BE USED IN THE SEGMENTS
LEAVING THE BIORETENTION CELL. UNDERDRAIN PIPES SHOWN ARE 4
INCHES. AFTER THE TWO PARALLEL UNDERDRAIN LINES MEET, A TEE
SHALL JOIN THEM, WITH A 6 INCH SOLID PIPE LEAVING TO TIE INTO
THE JUNCTION BOX. SEWER CLEANOUTS MUST BE INSTLALED 45 DEGREE
ANGLES AT THE UPSTREAM END OF EACH DRAIN (ONE PER
UNDERDRAIN LINE, TOTALLING 2).
Planting Specifications
THREE TO SIX INCHES OF TOPSOIL MUST BE APPLIED TO ALL SITE
DISTURBED AREAS, EXCEPT OVER THE BIORETENTION FILL MEDIA. DO
NOT PLACE TOPSOIL OVER THE BIORETENTION FILL MEDIA.
Construction Sequencing
1. THE DRAINAGE AREA TO THE BASIN MUST BE STABILIZED BEFORE
CONSTRUCTION BEGINS IN ORDER TO PREVENT CLOGGING OF THE
BIORETENTION MEDIA.
2. INSTALL SEDIMENT FENCE AROUND AREA OUTLINED ON PROPOSED
PLAN. INSTALL SEDIMENT FENCE ACCORDING TO DETAIL A. ALL
SEDIMENT FENCE MUST BE INSTALLED BEFORE BEGINNING WORK. ALL
SEDIMENT FENCE MUST BE INSTALLED WHEN WORK IS NOT TAKING
PLACE,
3. THE CONTRACTOR SHALL CALL THE "CALL BEFORE YOU DIG" TOLL
FREE NUMBER TO ENSURE THAT ALL UTILITIES ARE LOCATED AND
MARKED. THE CONTRACTOR SHALL BE RESPONSIBLE FOR ALL DAMAGES
INCURRED DURING CONSTRUCTION. THE CONTRACTOR SHALL NOTIFY THE
ENGINEER IMMEDIATELY IF UNEXPECTED FEATURES ARE DISCOVERD THAT
WOULD NECESSITATE MODIFICATION TO THE ILLUSTRATED DESIGN,
3. IT IS VERY IMPORTANT TO MINIMIZE COMPACTION OF IN —SITU SOIL
AT THE BASE OF THE BI ORETENTION CELL (BOTTOM OF THE
EXCAVATION). USE EXCAVATION HOES TO REMOVE ORIGINAL SOIL. IF
THE BIORETENTION AREAS ARE EXCAVATED USING A LOADER, THE
CONTRACTOR SHOULD USE WIDE TRACK OR MARSH TRACK EQUIPMENT,
OR LIGHT EQUIPMENT WITH TURF —TYPE TIRES. USE OF EQUIPMENT WITH
NARROW TRACKS OR NARROW TIRES, RUBBER TIRES WITH LARGE LUGS,
OR HIGH PRESSURE TIRES WILL CAUSE EXCESSIVE COMPACTION
RESULTING IN REDUCED INFILTRATION RATES AND STORAGE VOLUMES,
AND IS NOT ACCEPTABLE. COMPACTION WILL SIGNIFICANTLY CONTRIBUTE
TO DESIGN FAILURE.
4. CONTRACTOR SHALL SCARIFY THE BOTTOM OF THE BIORETENTION
EXCAVATION CUT WITH THE EXCAVATOR TEETH BEFORE THE ADDITION
OF THE MEDIA,
3. ANY BIORETENTION FILL MEDIA INSTALLED MUST BE PROTECTED
FROM FINE SEDIMENTS DURING CONSTRUCTION. AVOID COMPACTION BY
ALLOWING TIME FOR NATURAL COMPACTION AND SETTLEMENT TO
OCCUR. NO ADDITIONAL MANUAL COMPACTION OF SOIL IS NECESSARY.
RAKE SOIL MATERIAL AS NEEDED TO LEVEL OUT. OVERFILL ABOVE
PROPOSED SURFACE INVERT TO ACCOMMODATE NATURAL SETTLEMENT
TO PROPER GRADE. DEPENDING UPON THE SOIL MATERIAL, UP TO 20%
OF NATURAL COMPACTION MAY OCCUR.
SEDIMENT FENCE DETAILS (N.T.S)
EXTRA STRENGTH FILTER FABRIC NEEDED
WITHOUT WIRE MESH SUPPORT
STEEL POST
ATTACH FILTER FABRIC SECURELY
TO UPSTREAM SIDE OF POST
FLOW
T MUM SPACING
TRENCH
DETAIL
STEEL POST
RUNOFF
18" MI
6' X 6' TRENCH WITH
COMPACTED BACKFILL
TRENCH DETAIL
MAINTENANCE
INSPECT AND REPAIR FENCE EVERY T DAYS AND AFTER EACH
STORM EVENT. REMOVE SEDIMENT WHEN NECESSARY, 6"
MAXIMUM RECOMMENDED STORAGE HEIGHT.
Detail B
CONSTRUCTION ENTRANCE (N.T.S)
1. CLEAR THE AREA OF VEGETATION. REMOVE ALL ROOTS
AND ORGANIC DEBRIS. GRADE ALONG THE INTENDED LENGTH
OF THE ENTRANCE TO SMOOTH PROFILE. GRADE SUCH THAT
WATER IS CARRIED TO DOWNSLOPE, BUT IS NOT CHANNEUEED.
2. PLACE THE GRAVEL TO THE DIMENSIONS AS SHOWN IN THE DETAIL.
USE OF A GEOTEXTILE LAYER IS RECOMMENDED TO REDUCE
MAINTENANCE AND IMPROVE THE PERFORMANCE OF THE ENTRANCE.
II. MAINTENANCE
1. PERIODIC TOP -DRESSING WITH TWO (2) INCH WASHED STONE
MAY BE REQUIRED TO REDUCE THE TRANSPORT OF SEDIMENTS FROM
THE CONSTRUCTION SITE.
2. AFTER EACH RAINFALL EVENT, INSPECT THE ROADWAY. IF STONE
HAS BEEN DISPLACED OR A CHANNEL HAS BEEN FORMED, REPAIR
IMMEDIATELY. DO NOT USE THE ENTRANCE FOR CONSTRUCTION
TRAFFIC UNTIL THE ENTRANCE HAS BEEN REPAIRED.
III. REMOVAL
1. REMOVE THE CONSTRUCTION ENTRANCE AND SMOOTH THE
DISTURBED AREA TO BLEND WITH THE SURROUNDING TOPOGRAPHY.
n Nix J
zs connseA��Rewre � u NN
N.C. D.O.T. CLASS B RIPRAP SPECIFICATIONS
• MINIMUM 5" STONE DIAMETER
• D50 — 8"
• MAXIMUM 12" STONE DIAMETER
• NO MORE THAN 5% CAN BE LESS THAN
MINIMUM SIZE
• NO MORE THAN 10% CAN EXCEED
MAXIMUM SIZE RIPRAP APRON EVEN WITH
FINAL GRADE_
3.�
FILTER FABRIC (NC DOT
SECTION 1056—COMPLIANT)
Forebay Installation Specifications
1. GRADE THE FOREBAY AS SHOWN ON THE PROPOSED SHEET
2. FILTER FABRIC CLOTH MUST BE PROPERLY PROTECTED FROM
PUNCHING OR TEARING DURING INSTALLATION. REPAIR ANY DAMAGE BY
REMOVING THE RIPRAP AND PLACING ANOTHER PIECE OF FILTER CLOTH
OVER THE DAMAGED AREA. ALL OVERLAPPING SECTIONS SHOULD
OVERLAP A MINIMUM OF 1 FOOT, WITH ANCHOR PINS SPACED EVERY 3
FEET ALONG OVERLAP. IF THE DAMAGE IS EXTENSIVE, REPLACE THE
ENTIRE FILTER CLOTH.
3. GEOTEXTILE FABRIC MUST HAVE AN EOS NO LARGER THAN U.S.
STANDARD SIEVE #70, A THICKNESS OF 20-60 MILS, A GRAB
STRENGTH OF 90-120LB, AND MUST CONFORM TO ASTM D-1682 OR
ASTM D-177.
4. SUBGRADE FOR GEOTEXTILE FABRIC SHOULD BE CLEARED AND
GRUBBED TO REMOVE ALL ROOTS, VEGETATION, AND DEBRIS AND
PREPARED TO THE LINES AND GRADES SHOWN ON THE PLAN.
5. EXCAVATE DEEP ENOUGH FOR BOTH FILTER AND RIPRAP
6. ROCK AND/OR GRAVEL USED FOR RIPRAP SHALL CONFORM TO
SPECIFIED GRADATION
7. VOIDS IN THE ROCK RIPRAP SHOULD BE FILLED WITH SPALLS AND
SMALLER ROCKS.
—1 — ELEV 79.3'
North Carolina State University
CITY OF CHAPEL HILL DETAILS
Hargraves Community Center Bioretention Retrofit
Page Number
2 I G N. RObeY'SOII St.
Biological and Agricultural Engineering
IS Of G
NC5U Sox 7625 I Raleigh, N.C. 27G95
Designed By: ARj
Date:
Scale:
Chapel Hill, NC 275 14
b b
Reviewed BY:RJW,
MAY 31, 2012
Not Standard

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Project statistics on the Bolin Creek Chapel Hill EPA 319 Grant
Parameter
Hargraves
(Mitchell Ln.)
Dickerson
Ct.
Drainage area (acre)
0.98
0.55
BMP size (sf)
600
1195
WQ Storage depth (ft)
1.0
1.0
Media depth (ft)
3.0
3.0
IWS depth (ft)
1.4
2.0
Weir description
12" PVC stand pipe
Trapezoidal weir
Freeboard (ft)
0.25'
0.33'
TN load reduction (lb/yr)
1.88
4.42
TN post-BMP export (lb/yr)
3.48
8.19
TP load reduction (lb/yr)
0.25
0.60
TP post-BMP export (lb/yr)
0.31
0.74

STORMWATER OPERATIONS AND
MAINTENANCE PLAN
for
Homestead Park
Chapel Hill, NC
PIN: 9880127274

[Nyp �rnw�rVem <r.V
I
FF c.�..,� ■ Northern Community Park
I SCM #1 - Wet Pond Chapel Hill, Nor.h Carolina rk�r} ■
r J
1 11rPICAL GRASS LINED gWALE �Si Gp1455 L9gEQ SWALE T/�3• �l:I1RL®'1Y000LINED SVYACE
Ilk
' yv Q GRASS L NEO SWALE TYPE 2 �l OI7TLEr CNANHEI 6 AIP- W ...a..�. a
5 y, �� �PAPLINEO SWALE TYPE 1
m.=^ni , �"
-__-
ror � . '' w � •rnoeawl�na. f� ,�•...w..
41
SCM #2 - Stormwater Wetland ,,,,, 7
ten . n.eo.e �a.frr�. r
K57M...
c+w o.w•�m.apa +
- ' ` =[ r1 e.pr.rp
L�� l 1 , 1 — ..�•ri!' �- +m' b A SCM #3 - Dry Pond 4 �gi d Ewa
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a Lc'aI i s ■� ■
P.A.
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�/ i7-
11 I titi � �� 4 a�iLiww Mw.trwV.csMp
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Gra I g, $t{¢At Drasnage
��_ RIP•RAP LINED SWAL TYPE 2 �� SWALE_ OkiWEEk SOCCER FJEiIrfB � � - -- �ys� ■ ■ HNaIOn COIItCOI P1PIR -East ■a,� 58 -�-30- 0

Applicable to SCM #3
Stormwater Operation and Maintenance Plan
DRY POND
Regular inspection and maintenance are necessary to preserve long-term functionality of Stormwater
Control Measures "SCMs" per the original design intent. This Plan outlines the Town of Chapel Hill
requirements for regular inspection and maintenance of Dry Pond SCMs. The Owner as defined in the
Agreement shall keep a copy of this Stormwater Operations and Maintenance Plan, the SCM Inspection
and Maintenance Log, and a copy of the approved As -Built Plans in a known set location and made
available to the Town of Chapel Hill upon request.
Annual inspections shall be performed by a qualified licensed Professional Engineer or Landscape
Architect. Routine maintenance and inspection shall be performed by a qualified professional with
NCSU Stormwater Inspection and Maintenance Certification or similar certification.
The qualified professional shall maintain a SCM Inspection and Maintenance Log and make available to
the Town of Chapel Hill upon request. All inspections shall be recorded in the log according to the
frequency in the Inspection and Maintenance Table (Table 1 below) and within 24 hours after storm
events that exceed 1.0 inch of rainfall. Any deficit SCM elements noted during inspection shall be
recorded in the log and immediately corrected, repaired, or replaced. All routine and
corrective/emergency maintenance activities shall be recorded in the log. The log template can be
found at the Town of Chapel Hill Stormwater Control Measures website.
An Annual Inspection and Maintenance Report shall be submitted to the Town of Chapel Hill
Stormwater Department. The report shall detail the status of the SCM and maintenance performed as
outlined in the SCM Inspection Report Guidelines. A copy of the annual report shall be submitted to the
Town of Chapel Hill Stormwater Management Division beginning one year after issuance of the
Certificate of Occupancy.
REQUIRED INSPECTION AND MAINTENANCE TASKS FOR DRY PONDS
NOTE: The following inspection and maintenance table is not an exhaustive list of inspection and
maintenance tasks. It is the responsibility of the professional inspecting the facility to perform
comprehensive maintenance for the SCM to be operational.

Table 1: Inspection and Maintenance Provisions for Dry Ponds
FAL1,111hrILY
OF
MAINTENANCE ACTIVITIES
INSPECTIONS
Upon
construction
• Watering is needed twice a week until the grass become established (commonly
completion
6-8 weeks), depending on rainfall.
• Mow grass surface areas to a height of approximately six to eight inches and
remove grass clippings.
Once every
• Check inlet system and outlet device for any obstructions or clogging. Remove
accumulated grit, leaves, and debris and dispose off -site.
quarter
• Inspect for prolonged ponding and bare or eroding areas and make adjustments
as necessary.
• Remove any trash within the dry detention area.
Twice during
the growing
• Pull out weeds or invasives preferably by hand.
season
• Have the embankment inspected by a dam safety expert.
Annually
• Remove woody species on or near the embankment area and within the
maintenance access.
• Inspect all structural elements.
Vegetation
• If the dry detention basin suffers from dead or diseased plants or overgrown
with invasive species, evaluate the source of the problem: soils, hydrology,
species, or plant disease.
o Remediate the problem by selecting new grass species or implementing
an eradication plan for invasives.
o Ensure appropriate plant maintenance is occurring.
o A one-time fertilizer application to establish ground cover is permissible
if a soil test indicates it is necessary. No portion of the dry detention
system shall be fertilized after the initial fertilization that is required to
establish the vegetation.
As needed
• Remediate bare soils or erosive gullies.
(Typical
o In perimeter areas, regrade the soil to remove the gully, plant a ground
Problems)
cover and water until it is established. If soil test shows that the pH has
dropped, dolomitic lime shall be applied as recommended.
o Within the pretreatment area, provide erosion control devices such as
reinforced turf matting or riprap to avoid future problems with erosion.
• If soil test shows that the pH has dropped, dolomitic lime shall be applied as
recommended.
Structural integrity
• Replace or repair any cracked, separated or damaged inlet pipes, outfalls,
impoundment walls or other structural elements.
• If a tree has started to grow on the embankment, consult a dam safety specialist
to remove the tree.

• If the dam embankment or emergency spillway needs maintenance, consult with
a professional.
Functionality
• Sediment Accumulation
o Maintain stable ground cover in the drainage area.
o Sweep or vacuum sediment on pavement in the contributing drainage
area.
o If sediment has accumulated in the forebay reducing its depth to 75% of
the original design depth, remove the sediment and dispose of it in a
location where it will not impact the SCM or any stream. Search for the
source of the sediment in the drainage area and remedy the problem if
possible.
• If there is standing water more than 5 days after a storm event, inspect the
outlet device for obstructions and unclog immediately.
• If seepage is observed on the downstream face or other functional issues occur,
consult an appropriate professional.
• If evidence of a muskrat or beaver activity is observed, contact a professional to
remove muskrat or beaver.
For additional information or if damage has occurred at the outlet which effects the
receiving water, contact the Town at Chapel Hill Stormwater Management at 919-
969-7246 (RAIN).

Applicable to SCM #2
Stormwater Operation and Maintenance Plan
STORMWATER WETLAND
Regular inspection and maintenance are necessary to preserve long-term functionality of Stormwater
Control Measures "SCMs" per the original design intent. This Plan outlines the Town of Chapel Hill
requirements for regular inspection and maintenance of Stormwater Wetland SCMs. The Owner as
defined in the Agreement shall keep a copy of this Stormwater Operations and Maintenance Plan, the
SCM Inspection and Maintenance Log, and a copy of the approved As -Built Plans in a known set location
and made available to the Town of Chapel Hill upon request.
Annual inspections shall be performed by a qualified licensed Professional Engineer or Landscape
Architect. Routine maintenance and inspection shall be performed by a qualified professional with
NCSU Stormwater Inspection and Maintenance Certification or similar certification.
The qualified professional shall maintain a SCM Inspection and Maintenance Log and make available to
the Town of Chapel Hill upon request. All inspections shall be recorded in the log according to the
frequency in the Inspection and Maintenance Table (Table 1 below) and within 24 hours after storm
events that exceed 1.0 inch of rainfall. Any deficit SCM elements noted during inspection shall be
recorded in the log and immediately corrected, repaired, or replaced. All routine and
corrective/emergency maintenance activities shall be recorded in the log. The log template can be
found at the Town of Chapel Hill Stormwater Control Measures website.
An Annual Inspection and Maintenance Report shall be submitted to the Town of Chapel Hill
Stormwater Department. The report shall detail the status of the SCM and maintenance performed as
outlined in the SCM Inspection Report Guidelines. A copy of the annual report shall be submitted to the
Town of Chapel Hill Stormwater Management Division beginning one year after issuance of the
Certificate of Occupancy.
REQUIRED INSPECTION AND MAINTENANCE TASKS FOR STORMWATER WETLAND
Important: Please note that this inspection checklist is not an exhaustive list of maintenance tasks for any
particular SCM. It is the responsibility of the professional inspecting the facility to perform comprehensive
maintenance for the SCM to be operational.

Table 1: Inspection and Maintenance Provisions for Stormwater Wetland
OF
MAINTENANCE ACTIVITIES
INSPECTIONSFREQUENCY
• Watering is needed twice a week until the plants become established
Upon
(commonly 6-8 weeks), and then as needed during first growing season (April -
completion of
October), depending on rainfall.
construction
• Remove and replace dead plants.
• Remove any tree stakes or wires six months after planting.
• Mow grass surface areas to a height of approximately six to eight inches. Note,
a 10-foot unmowed vegetated buffer around wetland perimeter may be
established to filter pollutants from adjacent properties and prevent erosion.
• Check inlet, collection system and outlet device for clogging. Remove
Once a quarter
accumulated grit, leaves, debris and any other obstructions and dispose off -site.
• Remove trash accumulating around perimeter of wetland, at the outflow
structure, or floating in the pools.
• Inspect for ponding and bare or eroding areas and make adjustments as
necessary.
Twice during
the growing
. pull out weeds, dead, diseased, or invasives plants preferably by hand.
• Conduct an inspection of mosquito activity and treat as necessary.
season
• Have the embankment inspected by a dam safety expert.
Annually
• Prune trees and shrubs to best professional practice. Thin vegetation so that
sunlight can penetrate the bioretention surface.
• Reinforce planting in select areas of the wetland that fail to fill in or survive. An
Once every 2-3
extensive wetland wide replanting is required if 50% minimum coverage is not
achieved in the planted wetland zones after the second growing season.
years
• Remove woody species on or near embankment area and maintenance access.
A dam safety specialist should be consulted to remove any trees.
Vegetation
• If algal growth covers over 50% of the deep pool and shallow water areas,
consult a professional to remove and control the algal growth.
• If cattails, phragmites, or other invasive plants exceed 50% of the wetland area,
remove invasives by physical removal or wiping them with an aquatic herbicide.
As needed
Consult the Town of Chapel Hill before any aquatic herbicide is used. Site
(Typical
specific approval is required. Extended periods of dewatering may be a possible
Problems)
treatment approach for reducing invasives.
• If the stormwater wetland suffers from dead or diseased plants or overgrown
with invasive species, evaluate the source of the problem: soils, hydrology,
species, and/or type of disease to determine the cause of the plant failure.
o Remediate the problem by selecting new species and/or implementing
an eradication plan for invasives.
o Ensure appropriate plant maintenance is occurring.
STORMWATER WETLAND
PAGE 2 OF

o A one-time fertilizer application to establish ground cover is permissible
if a soil test indicates it is necessary. No portion of the stormwater
wetland shall be fertilized after the initial fertilization that is required to
establish the vegetation.
• Remediate bare soils or erosive gullies.
o In perimeter areas, regrade the soil to remove the gully, plant a ground
cover and water until it is established. If soil test shows that the pH has
dropped, dolomitic lime shall be applied as recommended.
o Within the pretreatment area, provide erosion control devices such as
reinforced turf matting or riprap to avoid future problems with erosion.
Structural Integrity
• Replace or repair any cracked, separated or damaged inlet pipes, overflow
structure, outfalls, impoundment walls or other structural elements.
• If dam embankment or emergency spillway needs maintenance, consult with a
professional.
Functionality
• If sediment has accumulated up in the forebay, shallow land areas, or deep pool
reducing their depth to 75% of the original design depth, remove the sediment
and dispose of it in a location where it will not cause impacts to the SCM or a
stream. Search for the source of the sediment in the drainage area and remedy
the problem if possible.
• If dredging is required and the site has clay soils, agricultural lime should be
spread over the entire water surface immediately following completion of
dredging operations to facilitate the settling of excess clay particles.
• If the shallow land remains flooded more than 5 days after a storm event,
inspect the outlet device for obstructions and unclog immediately.
• If evidence of a muskrat or beaver activity is observed, contact a professional to
remove muskrat or beaver.
For additional information or if damage has occurred at the outlet which effects the
receiving water, contact the Town at Chapel Hill Stormwater Management at 919-
969-7246 (RAIN).

Applicable to SCM #1
Stormwater Operation and Maintenance Plan
WET POND
Regular inspection and maintenance are necessary to preserve long-term functionality of Stormwater
Control Measures "SCMs" per the original design intent. This Plan outlines the Town of Chapel Hill
requirements for regular inspection and maintenance of Wet Pond SCMs. The Owner as defined in the
Agreement shall keep a copy of this Stormwater Operations and Maintenance Plan, the SCM Inspection
and Maintenance Log, and a copy of the approved As -Built Plans in a known set location and made
available to the Town of Chapel Hill upon request.
Annual inspections shall be performed by a qualified licensed Professional Engineer or Landscape
Architect. Routine maintenance and inspection shall be performed by a qualified professional with
NCSU Stormwater Inspection and Maintenance Certification or similar certification.
The qualified professional shall maintain a SCM Inspection and Maintenance Log and make available to
the Town of Chapel Hill upon request. All inspections shall be recorded in the log according to the
frequency in the Inspection and Maintenance Table (Table 1 below) and within 24 hours after storm
events that exceed 1.0 inch of rainfall. Any deficit SCM elements noted during inspection shall be
recorded in the log and immediately corrected, repaired, or replaced. All routine and
corrective/emergency maintenance activities shall be recorded in the log. The log template can be
found at the Town of Chapel Hill Stormwater Control Measures website.
An Annual Inspection and Maintenance Report shall be submitted to the Town of Chapel Hill
Stormwater Department. The report shall detail the status of the SCM and maintenance performed as
outlined in the SCM Inspection Report Guidelines. A copy of the annual report shall be submitted to the
Town of Chapel Hill Stormwater Management Division beginning one year after issuance of the
Certificate of Occupancy.
REQUIRED INSPECTION AND MAINTENANCE TASKS FOR WET POND
NOTE: The following inspection and maintenance table is not an exhaustive list of inspection and
maintenance tasks. It is the responsibility of the professional inspecting the facility to perform
comprehensive maintenance for the SCM to be operational.

Table 1: Inspection and Maintenance Provisions for Wet Pond
Feutliji
OF
MAINTENANCE ACTIVITIES
INSPECTIONS
Upon
• Watering is needed twice a week until the plants on the vegetated shelf and
completion of
perimeter of the basin become established (commonly 6-8 weeks), depending
construction
on rainfall.
• Mow grass surface areas to a height of approximately six to eight inches and
remove grass clippings.
• Check inlet system/forebay and outlet device for any obstructions or clogging.
Once a quarter
Remove accumulated grit, leaves, and debris and dispose off -site.
• Remove any trash within the pond area.
• Inspect for ponding and bare or eroding areas and make adjustments before the
next rainfall as necessary.
Twice during
the growing
• Pull out dead or diseased plants, weeds, or invasives preferably by hand.
season
• Have the embankment inspected by a dam safety expert.
• Remove woody species on or near embankment area and maintenance access.
Annually
A dam safety specialist should be consulted to remove any trees.
• Prune trees and shrubs to best professional practice. Thin vegetation so that
sunlight can penetrate the pond surface.
Vegetation
• If the wet pond suffers from dead or diseased plants or overgrown with invasive
species, evaluate the source of the problem: soils, hydrology, species, and/or
type of disease to determine the cause of the plant failure.
o Remediate the problem by selecting new species and/or implementing
an eradication plan for invasives.
o Ensure appropriate plant maintenance is occurring.
o A one-time fertilizer application to establish ground cover is permissible
As needed
if a soil test indicates it is necessary. No portion of the wet pond system
(Typical
shall be fertilized after the initial fertilization that is required to establish
Problems)
the vegetation.
o Consult with the Town of Chapel Hill Stormwater Management Division
If algal growth covers 50% of the area, consult a professional to remove
and control the algal growth.
• If cattails, phragmites, or other invasive plants exceed 50% of the wet pond,
remove invasives by physical removal or wiping them with a herbicide. Consult
the Town of Chapel Hill before any aquatic herbicide is used. Site specific
approval is required. Extended periods of dewatering may be a possible
treatment approach for reducing invasives.

• Remediate bare soils or erosive gullies.
o In perimeter areas, regrade the soil to remove the gully, plant a ground
cover and water until it is established. If soil test shows that the pH has
dropped, dolomitic lime shall be applied as recommended.
o Within the pretreatment area, provide erosion control devices such as
reinforced turf matting or riprap to avoid future problems with erosion.
Structural integrity
• Replace or repair any cracked, separated or damaged inlet pipes, outfalls,
impoundment walls or other structural elements.
• If dam embankment or emergency spillway needs maintenance, consult with a
professional.
Functionality
• Sediment Accumulation
o Maintain stable ground cover in the drainage area.
o Sweep or vacuum sediment on pavement in the contributing drainage
area.
o If sedimentation or clogging is occurring in the inlet, design modification
may be needed to ensure adequate drop or slope between inlet and
filter bed.
o If sediment has accumulated in the forebay area reducing its depth to
75% of the original design depth, remove the sediment off site,
restabilize the area, and replace with clean rock. Search for the source
of the sediment in the drainage area and remedy the problem if possible.
• If there are visible disturbances to the forebay design, make the necessary
repairs to ensure that the forebay is functioning as intended.
• If evidence of a muskrat or beaver activity is observed, contact a professional to
remove muskrat or beaver.
• If the basin must be drained for an emergency or to perform maintenance, the
flushing of sediment through the emergency drain should be minimized to the
maximum extent practical.
For additional information or if damage has occurred at the outlet which effects the
receiving water, contact the Town at Chapel Hill Stormwater Management at 919-
969-7246 (RAIN).

STORMWATER OPERATIONS AND
MAINTENANCE PLAN
for
Ephesus Park
Chapel Hill, NC
PIN: 9799547762

ISCM #1 - Bioretention
1 --GA I E
A❑ MOUNTED UNDERGROUND TRANSFORMER
WASTE RECEPTACLE WASTE RECEPTACLE
ON CONCRETE PAD (ON PAD) LEGEND
— BENCHMARK
I(� — SANITARY SEWER MANHOLE
ryiryJlJ — CLEAN OUT
EXISTING PIPE
— EXISTING LIGHT POLE
Add6•py(dr&inp4. EXISTING TOP OF CURB
pnderlthmugh pad rn — EXISTING EDGE OF PAVEMENT
nmacewrrugaled — EXISTING LANDSCAPE TIMBERS
pt-i M- — EXISTING FENCE LINE
— EXISTING SIDEWALK LINE
mans'=e5 — EXISTING GRAVEL LINE
COncmtt dbhid
and bench — EXISTING DRAINAGE PIPE
:tlpp� Y TREE PROTECTION FENCE
0 centcad
°e red a ^EXISTING PICKLEBALL COURTS
Q °=a
o � PROPOSER LANDSCAPE TIMB: °fin
rxav;ro casauwso w.snc d
m_+ N or cam"
V unwtl[ 4•,= - else ^WIIP
x Ephesus Park Improvements
I natsll cmrcrete --.ble ram
aE rare ing �� Q ` i5ol Ephesus Church Road Toxin of Chapel Hill Parks and Recreation Department 1,20-19
w rai-d planter _ _ _ — �d edge of exisring sidewalE
Install 5' a ta'mvcrcte pad sv CnatLe 5's S' lurdir�
GATE
ewc�o coareucsrro a sne -1-V
Excavate 1-4 d
and inst 1
bioreteation basin
per d4a I
ies __ _ m�.e °"0�O Install a5y' diameter
boulders truuponed Gam
ltwnavpplievv at Hmnmta d
Park [6' v.c
'--imaignlum6m
iretnu >s eeP>;�e nrro I se�ffxorrcutc racsPunrs -
hlcyde Is
pa k r rctetr rbmtapa N
detects a yarning pa park And p
tnsra eana�esihle add ultr:mnr� .
handicap par king—1 car &iuingedge°F Install �rnxl ,
spore with shared aisle on
6"concrete yavemprr � I„rl:l,.c„-nh�'
bride•r .rlyry
Add sluldlnl
evrbandgutter EXISTING PARKING LOT— - Add alternate:
Extend fill
wad sra�tg �' along existing
epmeca xdt rimber r
path to create
stable,
walkable slope
I,
Install rip rnp
dissipater vsv
'�. 3 geamxrite tatric as
�J part of add altervare
15" FLARED END SECTIO
INVERT OUT: 305,57�

Applicable to SCM#1
Stormwater Operation and Maintenance Plan
BIORETENTION CELL
Regular inspection and maintenance are necessary to preserve long-term functionality of Stormwater
Control Measures "SCMs" per the original design intent. This Plan outlines the Town of Chapel Hill
requirements for regular inspection and maintenance of Bioretention Cell SCMs. The Owner as defined
in the Agreement shall keep a copy of this Stormwater Operations and Maintenance Plan, the SCM
Inspection and Maintenance Log, and a copy of the approved As -Built Plans in a known set location and
made available to the Town of Chapel Hill upon request.
Annual inspections shall be performed by a qualified licensed Professional Engineer or Landscape
Architect. Routine maintenance and inspection shall be performed by a qualified professional with
NCSU Stormwater Inspection and Maintenance Certification or similar certification.
The qualified professional shall maintain a SCM Inspection and Maintenance Log and make available to
the Town of Chapel Hill upon request. All inspections shall be recorded in the log according to the
frequency in the Inspection and Maintenance Table (Table 1 below) and within 24 hours after storm
events that exceed 1.0 inch of rainfall. Any deficit SCM elements noted during inspection shall be
recorded in the log and immediately corrected, repaired, or replaced. All routine and
corrective/emergency maintenance activities shall be recorded in the log. The log template can be
found at the Town of Chapel Hill Stormwater Control Measures website.
An Annual Inspection and Maintenance Report shall be submitted to the Town of Chapel Hill
Stormwater Department. The report shall detail the status of the SCM and maintenance performed as
outlined in the SCM Inspection Report Guidelines. A copy of the annual report shall be submitted to the
Town of Chapel Hill Stormwater Management Division beginning one year after issuance of the
Certificate of Occupancy.
REQUIRED INSPECTION AND MAINTENANCE TASKS FOR BIORETENTION CELL
NOTE: The following inspection and maintenance table is not an exhaustive list of inspection and
maintenance tasks. It is the responsibility of the professional inspecting the facility to perform
comprehensive maintenance for the SCM to be operational.

Table 1: Inspection and Maintenance Provisions for Bioretention Cell
OF
MAINTENANCE ACTIVITIES
INSPECTIONSFREQUENCY
• Watering is needed twice a week until the plants become established (commonly
Upon
6-8 weeks) and then as needed during first growing season (April -October),
construction
depending on rainfall.
completion
• Remove and replace dead plants.
• Remove any tree stakes or wires six months after planting.
• Mow any bioretention with turf cover to a height of approximately six to eight
inches and remove grass clippings.
Once every
• Check inlet, collection system and outlet device for clogging. Remove
accumulated grit, leaves, debris and any other obstructions and dispose off -site.
quarter
. Inspect for ponding and bare or eroding areas and make adjustments as
necessary.
• Remove trash and/or debris from the bioretention area.
Twice during
the growing
• Pull out weeds and dead, diseased, or invasives plants preferably by hand.
season
• For bioretention areas without turf cover, supplement triple shredded hard wood
mulch in devoid areas to maintain a maximum 3 inch layer.
• Prune trees and shrubs to best professional practice. Thin vegetation so that
Annually
sunlight can penetrate the bioretention surface.
• Inspect the observation/cleanout wells to ensure that the underdrain is
functioning. If clogging has occurred, wash out the underdrain.
• Inspect all structural elements.
• Conduct a soil test for pH and heavy metals and determine the infiltration rate.
• For bioretention areas without turf cover, remove and replace the mulch layer
Once every
with triple shredded hard wood. The ideal time to reapply mulch is in the late
2-3 years
spring.
. An extensive replanting is required if 50% minimum coverage throughout the
basin is not achieved in the bioretention after the second growing season.
Once every 5
• Perform facility "make -over" to maintain intended landscaping regime and
to 7 years
address any maintenance problems detected during routine inspections. After 5
growing seasons, the vegetation should achieve 75/ coverage.
Vegetation
As Needed
• If the bioretention cell suffers from dead or diseased plants or overgrown with
(Typical
invasive species, evaluate the source of the problem: soils, hydrology, species,
Problems)
and/or type of disease to determine the cause of the plant failure.
o Remediate the problem by selecting new species and/or implementing an
eradication plan for invasives.

o Ensure appropriate plant maintenance is occurring.
o A one-time fertilizer application to establish ground cover is permissible if
a soil test indicates it is necessary. No portion of the dry detention system
shall be fertilized after the initial fertilization that is required to establish
the vegetation.
o Consult with the Town of Chapel Hill Stormwater Management Division
before any aquatic herbicide is used and site specific approval is given.
• If vegetation coverage is not achieved, add reinforcement planting to maintain
desired vegetation density and/or split out perennials to increase plant cover.
Desired vegetation coverage is 50% after 2 growing seasons and 75% after 5
growing seasons
• Remediate bare soils or erosive gullies.
o In perimeter areas, regrade the soil to remove the gully, plant a ground
cover and water until it is established. If soil test shows that the pH has
dropped, dolomitic lime shall be applied as recommended.
o Within the pretreatment area, provide erosion control devices such as
reinforced turf matting or riprap to avoid future problems with erosion.
Filter Media Failure
• If the bioretention area shows signs of clogging, identify source of sediment and
work to remediate or eliminate it before proceeding with the following
maintenance tasks.
o Flush the underdrains and capture any sediment before it enters any
downstream stream or storm drain system.
o Conduct one or more test pits to determine the depth of soil
contamination.
o Before remediating the filter bed, remove and temporary store any plants.
o Remove the accumulated sediment to the point where sediment is no
longer observed in the soil media plus an additional 2 inches of soil. Either
replace with new media or till 2 to 3 inches of sand into the upper 8 to 12
inches of soil.
o Dispose of any removed soil in an appropriate off -site location.
o Replant and mulch the area of disturbance.
• If soil test shows that the pH has dropped, dolomitic lime shall be applied as
recommended.
• If the soil test shows that heavy metals have accumulated, the toxic soils shall be
removed, disposed of properly, and replaced with new planting media.
Structural Integrity
• Replace or repair any cracked, separated or damaged inlet pipes, drop inlets,
overflow structure, outfalls, impoundment walls or other structural elements.
Functionality
• If flow is bypassing the pretreatment area, regrade to route all flow to the
pretreatment area.
• Sediment Accumulation
o Maintain stable ground cover in the drainage area.

o Sweep or vacuum sediment on pavement in the contributing drainage
area.
o If sedimentation or clogging is occurring in the inlet, design modification
may be needed to ensure adequate drop or slope between inlet and filter
bed.
o If sediment has accumulated in the forebay area or basin reducing its
depth to 75% of the original design depth, remove the sediment,
restabilize the area, and replace with clean rock. Search for the source of
the sediment in the drainage area and remedy the problem if possible.
• If greater than one feet of localized bed sinking and/or sediment is observed by
the underdrain or overflow, conduct a test pit excavation by hand to examine
subsurface conditions. Look for sediment across layers, discoloration, voids, loss
of material. Cause of bed sinking may be breached material layers, poor
connections, or damaged pipes. Repair the test pit to full functionality without
cross contamination of the individual material layers.
For additional information or if damage has occurred at the outlet which effects the
receiving water, contact the Town at Chapel Hill Stormwater Management at 919-
969-7246 (RAIN).

Figure 2: Sioretention Example: Cross -Section
PFAK ATTEMLAMN OUTLET LW POMM DUMO ADM FLAMED SURFACE
EMOUN(MDFF 12 N -WATER 01aA M DESIGN VOLUME
UMMUM WIDTH 17 IS N-PEAKATTENUTATgN OUTLET ELEVATION
Fat hurV0*A = ACC= 34 N •PEAKATTENUATW VOLUME
PEAK ATTENL ATI N YOLUME
r SLEANOVT
PROVI E AT LEAST
OW PERDESIGN 'AftW�gERDR,UHH
r- MARCH LAYER
LIEDIA NOTEMi: y
WDIA Ujk
T> E MEW SHOULD BE COMPOSED OF AHOMMOOENOUSLAX
OF THE FOIiOMYWx
a 7S • H% AEMW TO COARSE WASHED SAND
6 a • V% FSES (SILT AND CLAYk AND
e S . 104E OWAFEG YATTER [SUCH AS Pf& 9AttK FMS1
MJNIMf tl# ME01A_XPTH
ALL CELLS KTtH TREES AND SHRUBS 35 INCtES
CELLS WITHOUT TAPES AND SHRUBS:
VATH MID INS 74 INCHES
VATH MS: 30 tNAIE S
UEDL4 PaHgEI[
LESS THAN 30 N NSW ►1'ATT; R$
LESS THAN SO ELSEM-CRE
MIECAi► MIAMFNAHCE
►wNTAII MEDIA SUCH THIT WLTRATIOH RATE IS AT LWT
I "R
HIPS
Z.z.
PERFORATED SET T1E TOP OF
LIN ERCRAN PIPE THE RVS ZONE A
UP111 LlSf OF 19
NO MECHANICAL CDMPACITOH t S W
Ua NUT �aMAIVICAur THE PIAHTtNG
SERFAGE
COMPACT THE NECLA WATER OR
WALK ON IT AS IT tS PLACED.
SHIWT DUST BE � x FT BELQiV T1E
LOWEST POINT OF T}f BMTEN nON CELL
(Modify to eliminate cleanout in the basin while keeping upturned pipe in the drainage structure.)
l � BIORETENTION BASIN (NOT To SCALE)
Specifications for Ephesus Park Improvements Page 12 of 12

0
Stormwater Facility
Operation and Maintenance__.
Schedule
Southern Community Park
Town of Chapel Hill
1300 US Hwy 15-501 South
Chapel Hill, NC 27514
PIN: 9777937966
Prepared By:
MITCHELL+ WESTENDDRF, P.A.
ENGINEERING & SURVEYING
1709 Legion Road, Suite 201
Chapel Hill, NC 27517
September 23, 2009
j,23-01

0
�m
DRY DETENTION/
INFILTRATION
BASIN # I
SCM #1 I'
SCM #2
STORMWATER
n � > . BA51N #2
Lied
10� ,
. r
BIORETENPON
4
BA51N #3
SCM #3
FN
�-- qw WET DETENTION
'roject:
Southern Community Park
Date: August 31, 2009
Description:
MITChiELL WE5TENd�RF, P.A.
g
Scale: Irl = 100'
Stormwater facility
ENGINEEWNG S SURVEYING
Pro'ect No:
Area Map
P�999,tg,���oao. s�,r 29 oP�
3 zrss� r�ie Ev
Sheet 1 of 1

Applicable to SCM#1
Dry Detention/ Infiltration Basin #1
Operation and Maintenance Manual
I will keep a maintenance record on this BMP. This maintenance record will be kept in a
log in a known set location. Any deficient BMP elements noted in the inspection will be
corrected, repaired or replaced immediately. These deficiencies can affect the integrity
of structures, safety of the public, and the removal efficiency of the BMP.
Important maintenance procedures:
— The drainage area will be carefully managed to reduce the sediment load to the
infiltration basin.
Immediately after the infiltration basin is established, the vegetation will be
watered twice weekly if needed until the plants become established (commonly
six weeks).
— No portion of the infiltration basin will be fertilized after the initial fertilization
that is required to establish the vegetation.
— The vegetation in and around the basin will be maintained at a height of
approximately six inches.
After the infiltration basin is established, it will be inspected once a quarter and within
24 hours after every storm event greater than 1.0 inches (or 1.5 inches if in a Coastal
County). Records of operation and maintenance will be kept in a known set location
and will be available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element:
Potentialproblem:
How I will remediate the roblem:
The entire BMP
Trash/debris is present.
Remove the trash/debris.
The perimeter of the
Areas of bare soil and/or
Regrade the soil if necessary to
infiltration basin
erosive gullies have formed.
remove the gully, and then plant a
ground cover and water until it is
established. Provide lime and a
one-time fertilizer application.
The inlet device: pipe or
The pipe is clogged (if
Unclog the pipe. Dispose of the
swale
applicable).
sediment off -site.
The pipe is cracked or
Replace the pipe.
otherwise damaged (if
applicable).
Erosion is occurring in the
Regrade the swale if necessary to
swale (if applicable).
smooth it over and provide erosion
control devices such as reinforced
turf matting or riprap to avoid
future problems with erosion.
Page 1 of 3

BMP element:
Potentialproblem:
How I will remediate theproblem:
The forebay
Sediment has accumulated
Search for the source of the
and reduced the depth to 75%
sediment and remedy the problem if
of the original design depth.
possible. Remove the sediment and
dispose of it in a location where it
will not cause impacts to streams or
the BMP.
Erosion has occurred or
Provide additional erosion
riprap is displaced.
protection such as reinforced turf
matting or riprap if needed to
prevent future erosion problems.
Weeds are present.
Remove the weeds, preferably by
hand. If pesticides are used, wipe
them on the plants rather than
wain.
The main treatment area
A visible layer of sediment
Search for the source of the
has accumulated.
sediment and remedy the problem if
possible. Remove the sediment and
dispose of it in a location where it
will not cause impacts to streams or
the BMP. Replace any media that
was removed in the process.
Revegetate disturbed areas
immediately
Replace the top few inches of filter
Water is standing more than
5 days after a storm event.
media and see if this corrects the
standing water problem. If so,
revegetate immediately. If not,
consult an appropriate professional
for a more extensive repair.
Weeds and noxious plants are
Remove the plants by hand or by
growing in the main
wiping therm with pesticide (do not
treatment area.
spray).
The embankment
Shrubs or trees have started
Remove shrubs or trees
to grow on the embankment.
immediately.
An annual inspection by an
Make all needed repairs.
appropriate professional
shows that the embankment
needs repair.
The outlet device
Clogging has occurred.
Clean out the outlet device. Dispose
of the sediment off -site.
The outlet device is damaged
Repair or replace the outlet device.
The receiving catch
The basin is clogged or full of
Contact the Town of Chapel Hill
basin located in Town
sediment
Public Works Department
Park and Ride Lot
Page 2 of 3

DRY DETENTION 1 INFILTRATION BASIN #1
DIO R TfNTION DA51N # I :
Tree following Flap" shall be m3talled m the approprwte
eategones. Rafermr= pfart schedule for spcoficatrom.
SHALLOW WATER PLANTS:
Irotall errdre ar-a 2WO 5r wrath equal percc"e of
the following;
I /3 - AfTowhead, Duck potato
I/3 - flcktrehMeed
1 /3 - Lmrds Tal
5hiALLOW LAND PIANT5:
Irntall entxe area 2 195 51' mth equal perrertagc of
the folfowxrg;
13 - ralx Nettle
13 - Rose Mallow
13 - 5martwezd

Dry Detention / Infiltration Basin #1 Maintanance and Inspection Checklist
Project Name:
Project Address: _
Owner's Name: _
Owner's Address:
Recorded Book and Page Number of the Lot:
BMP Name and Location:
Inspection Date:
Inspector:
Inspector Address/Phone Number:
Date Last Inspected:
Maintenance Item
A
a.
Comments/Actions Required
1. Debris Clean out
Clear of trash and debris M
2. Ve etation Mannement
Banks / surrounding areas mowed (3 to 6-inch het ht)
M
Unwanted vegetation resent
M
Condition of plants
M
Condition of mulch - Must be double hammered
hardwood, 3 inches deep (replace at least every 3
ears and renew yearly)
M
3. Erosion
Evidence of soil erosion on banks or contributing
areas
M
4. Sedimentation
Forebay/Pretreatment Area — evidence of sediment
accumulation (cleanout as necessary)
M
Evidence of sediment in bioretention cell
M
5. EneEg dissipaters
Condition of dissipater at inlets
M
Condition of dissipater at outfall
M
Inspect gravel verge (replace as needed)
M
6. Inlet
Condition of pipe or swale (cracks, leaks,
sedimentation, wood ve etation)
M
7.Outlet
Condition of outlet / drop box M
8. Dewate ' (drawdown must be between 48 hours and 120 hours)
Evidence of standing water M
9. Ovendl functionalit
Evidence of bypass
M
P-Index and pH test results for soil media (indicate
test results and date last tested)
Y2
10. Miscellaneous
Maintenance re2onsibility sign in place and legible M
W=Weekly, M=Monthly, Q=Quarterly, Y=Yearly, Y2=every 2 yrs.

If applicable: Attach to this form documentation of BMP maintenance escrow account activity. This
may be provided in the form of a bank statement which includes the current balance, as well as deposits
and withdraws for the previous 12 months.
Maintenance Actions Taken: f If any of the above items were marked "U" for unsatisfactory, explain
the actions taken and time table for correction. Attach additional pages as necessary.]
Additional Comments:
I do hereby certify that I conducted an inspection of the BMP described herein. I further certify that at
the time of my inspection said BMP was performing properly and was in compliance with the terms and
conditions of the approved maintenance agreement required by the Phase H Post -Construction Storm
Water Ordinance.
Certification:
Inspectors Signature
(seal)
Date

Applicable to SCM#2
Stormwater Wetland Basin #2
Operation and Maintenance Manual
I will keep a maintenance record on this BMP. This maintenance record will be kept in a
log in a known set location. Any deficient BMP elements noted in the inspection will be
corrected, repaired or replaced immediately. These deficiencies can affect the integrity
of structures, safety of the public, and the removal efficiency of the BMP.
Important maintenance procedures:
— Immediately after the stormwater wetland is established, the wetland plants will
be watered twice weekly if needed until the plants become established
(commonly six weeks).
— No portion of the stormwater wetland will be fertilized after the first initial
fertilization that is required to establish the wetland plants.
— Stable groundcover will be maintained in the drainage area to reduce the
sediment load to the wet detention basin.
Once a year, a dam safety expert will inspect the embankment.
After the wet detention pond is established, I will inspect it once a month and within 24
hours after every storm event greater than 1.0 inches (or 1.5 inches if in a Coastal
County). Records of operation and maintenance will be kept in a known set location
and will be available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element:
Potentialproblem:
How I will remediate theproblem:
The entire BMP
Trash/debris is present.
Remove the trash/debris.
The perimeter of the
Areas of bare soil and/or
Regrade the soil if necessary to
wetland
erosive gullies have formed.
remove the gully, and then plant a
ground cover and water until it is
established. Provide Iime and a
one-time fertilizer application,
Vegetation is too short or too
Maintain vegetation at a height of
long.
approximately six inches.
The inlet device: pipe or
The pipe is clogged (if
Unclog the pipe. Dispose of the
swale
applicable).
sediment off -site.
The pipe is cracked or
Replace the pipe.
otherwise damaged (if
applicable).
Erosion is occurring in the
Regrade the swale if necessary to
swale (if applicable).
smooth it over and provide erosion
control devices such as reinforced
turf matting or riprap to avoid
future problems with erosion.
Page 1 of 4

BMP element:
Potentialproblem:
How I will remediate theproblem:
The forebay
Sediment has accumulated in
Search for the source of the
the forebay to a depth that
sediment and remedy the problem if
inhibits the forebay from
possible. Remove the sediment and
functioning well.
dispose of it in a location where it
will not cause impacts to streams or
the BMP.
Erosion has occurred.
Provide additional erosion
protection such as reinforced turf
matting or riprap if needed to
prevent future erosion problems.
Weeds are present.
Remove the weeds, preferably by
hand. If a pesticide is used, wipe it
on the plants rather than spraying.
The deep pool, shallow
Algal growth covers over
Consult a professional to remove
water and shallow land
50% of the deep pool and
and control the algal growth.
areas
shallow water areas.
Cattails, phragmites or other
Remove the plants twice (2) per year
invasive plants.
by wiping them with pesticide (do
not spray) - consult a professional.
Shallow land remains flooded
Unclog the outlet device
more than 5 days after a
immediately.
storm event.
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.
Best professional practices
Prune according to best professional
show that pruning is needed
practices.
to maintain optimal plant
health.
Sediment has accumulated
Search for the source of the
and reduced the depth to 75%
sediment and remedy the problem if
of the original design depth
possible. Remove the sediment and
of the deep pools.
dispose of it in a location where it
will not cause impacts to streams or
the BMP.
Page 2 of 4

BMP element:
Potentialproblem:
Horny I will remediate theproblem:
The embankment
A tree has started to grow on
Consult a dam safety specialist to
the embankment.
remove the tree.
An annual inspection by an
Make all needed repairs.
appropriate professional
shows that the embankment
needs repair.
Evidence of muskrat or
Use traps to remove muskrats and
beaver activity is present.
consult a professional to remove
beavers.
The micropool
Sediment has accumulated
Search for the source of the
and reduced the depth to'75%
sediment and remedy the problem if
of the original design depth.
possible. Remove the sediment and
dispose of it in a location where it
will not cause impacts to streams or
the BMP.
Plants are growing in the
Remove the plants, preferably by
micropool.
hand. If a pesticide is used, wipe it
on the plants rather than Spraying.
The outlet device
Clogging has occurred.
Clean out the outlet device. Dispose
of the sediment off -site.
The outlet device is damaged
Repair or replace the outlet device.
The receiving water
Erosion or other signs of
Contact the Town of Chapel Hill
damage have occurred at the
Stormwater Department at
outlet.
969-7246
Page 3 of 4

Applicable to SCM#3
Bioretention Basin #3
Operation and Maintenance Manual
I will keep a maintenance record on this BMP. This maintenance record will be kept in a
log in a known set location. Any deficient BMP elements noted in the inspection will be
corrected, repaired or replaced immediately. These deficiencies can affect the integrity
of structures, safety of the public, and the removal efficiency of the BMP.
Important operation and maintenance procedures:
— Immediately after the bioretention cell is established, the plants will be watered
twice weekly if needed until the plants become established (commonly six
weeks).
— Snow, mulch or any other material will NEVER be piled on the surface of the
bioretention cell.
— Heavy equipment will NEVER be driven over the bioretention cell.
— Special care will be taken to prevent sediment from entering the bioretention cell.
-- Once a year, a soil test of the soil media will be conducted.
After the bioretention cell is established, I will inspect it once a month and within 24
hours after every storm event greater than 1.4 inches (or 1.5 inches if in a Coastal
County). Records of operation and maintenance will be kept in a known set location
and will be available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element:
Potentialproblems:
How I will remediate theproblem:
The entire BMP
Trash/ debris is present.
Remove the trash/ debris.
The perimeter of the
Areas of bare soil and/or
Regrade the soil if necessary to
bioretention cell
erosive gullies have formed.
remove the gully, and then plant a
ground cover and water until it is
established. Provide lime and a
one-time fertilizer application.
The inlet device: pipe,
The pipe is clogged (if
Unclog the pipe. Dispose of the
stone verge or swale
applicable),
sediment off -site.
The pipe is cracked or
Replace the pipe.
otherwise damaged (if
applicable).
Erosion is occurring in the
Regrade the swale if necessary to
swale (if applicable).
smooth it over and provide erosion
control devices such as reinforced
turf matting or riprap to avoid
future problems with erosion.
Stone verge is clogged or
Remove sediment and clogged stone
covered in sediment (if
and replace with clean stone.
applicable).
Page I of 3

BMP element:
Potential roblems:
How I will remediate theproblem:
The pretreatment area
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 to
Search for the source of the
a depth greater than three
sediment and remedy the problem if
inches.
possible. Remove the sediment and
restabilize the pretreatment area.
Erosion has occurred.
Provide additional erosion
protection such as reinforced turf
matting or riprap if needed to
prevent future erosion problems.
Weeds are present.
Remove the weeds, preferably by
hand.
The bioretention cell:
Best professional practices
Prune according to best professional
vegetation
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 -tinge
fertilizer application to establish the
ground cover if a soil test indicates
it isnecessary.
Tree stakes/wires are present
Remove tree stake/wires (which can
six months after planting.
kill the tree if not removed).
The bioretention cell:
Mulch is breaking down or
Spot mulch if there are only random
soils and mulch
has floated away.
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
Determine the extent of the clogging
clogged with sediment.
- remove and replace either just the
top layers or the 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 for the source of the
sediment and remedy the problem if
ossible.
An annual soil test shows that
Dolomitic lime shall be applied as
pH has dropped or heavy
recommended per the soil test and
metals have accumulated in
toxic soils shall be removed,
the soil media.
disposed of properly and replaced
with new planting media.
Page 2 of 3

$MP element:
Potentialproblems:
How I will remediate theproblem:
The underdrain system
Clogging has occurred.
Wash out the underdrain system.
i£ applicable)
The drop inlet
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.
The receiving water
Erosion or other signs of
Contact the the Town of Chapel Hill
damage have occurred at the
Stormwater Department at 969-7246
outlet.
I acknowledge and agree by my signature below that I am responsible for the
performance of the maintenance procedures listed above. I agree to notify DWQ of any
problems with the system or prior to any changes to the system or responsible party.
Project name:
BMP drainage area number:
Print name:
Title:
Address:
Phone:
Signature:
Date:
Page 3 of 3

.ANTS
NO PLANTS
BIO RETENTION BASIN #3
BIO RETENTION BASIN #3:
The Following plants shaA be irotalkd in the appro"te
categoney. Reference plant 3dredUc for spcubcatiaro.
SHALLOW WATER PLANTS:
Install endre area 1 420 5F wrh elLwi perccntsgc of
the followmg;
1/3 - Arrow+c d, Duck Potato
113 - Pickrrelurrd
1 /3 - Umrds Tad
SHALLOW LAND PLANTS:
Irotall entGra area 1 040 5F with equal percentage of
the folk7";
1/3 - False Nettle
113 - Rose Mallow
113 - 5martwtdd

Bioretention Basin #3 Maintanance and Inspection Checklist
Project Name: _
Project Address:
Owner's Name:
Owner's Address:
Recorded Book and Page Number of the Lot:
BMP Name and Location:
Inspection Date:
Inspector:
Inspector Address/Phone Number:
Date Last inspected:
Maintenance Item
Qn
C:
r�
Comments/Actions Required
1. Debris Clean out
Clear of trash and debris M
2. Vegetation Management
Banks / surrounding areas mowed (3 to 6-inch height)
M
Unwanted vegetation present
M
Condition of plants
M
Condition of mulch - Must be double hammered
hardwood, 3 inches deep (replace at least every 3
ears and renew yearly)
M
3. Erosion
Evidence of soil erosion on banks or contributing
areas
M
4. Sedimentation
Forebay/Pretreatment Area — evidence of sediment
accumulation (cleanout as necessary)
M
Evidence of sediment in bioretention cell
M
S. Energy dissipaters
Condition of dissi ater at inlets
M
Condition of dissipater at outfall
M
Inspect gravel verge (replace as needed)
M
G. Inlet
Condition of pipe or swale (cracks, leaks,
sedimentation, woody vegetation)
M
7. Outlet
Condition of outlet / drop box M
8. Dewaterin (drawdown must be between 48 boors and 120 boors)
Evidence of standing water M
9.Overall functionality
Evidence of bypass
M
P-Index and pll test results for soil media (indicate
test results and date last tested)
Y2
10. Miscellaneous
Maintenance responsibility sign in place and legible M
W=Weekly, M=Monthly, Q=Quarterly, Y=Yearly, Y2=every 2 yrs,

If applicable: Attach to this form documentation of BMP maintenance escrow account activity. This
may be provided in the form of a bank statement which includes the current balance, as well as deposits
and withdraws for the previous 12 months.
Maintenance Actions Taken: [If any of the above items were marked "U" for unsatisfactory, explain
the actions taken and time table for correction. Attach additional pages as necessary.]
Additional Comments:
I do hereby certify that I conducted an inspection of the BMP described herein. I further certify that at
the time of my inspection said BMP was performing properly and was in compliance with the terms and
conditions of the approved maintenance agreement required by the Phase U Post -Construction Storm
Water Ordinance.
Certification:
Inspectors Signature
(seal)
Date

Applicable to SCM#4
Wet Detention Basin #4
Operation and Maintenance Manual
I will keep a maintenance record on this BMP. This maintenance record will be kept in a
log in a known set location. Any deficient BMP elements noted in the inspection will be
corrected, repaired or replaced immediately. These deficiencies can affect the integrity
of structures, safety of the public, and the removal efficiency of the BMP.
The wet detention basin system is defined as the wet detention basin,
pretreatment including forebays and the vegetated filter if one is provided.
This system (check one):
❑ does ❑ does not incorporate a vegetated filter at the outlet.
This system (check one):
❑ does ® does not incorporate pretreatment other than a forebay.
Important maintenance procedures:
— Immediately after the wet detention basin is established, the plants on the
vegetated shelf and perimeter of the basin should be watered twice weekly if
needed, until the plants become established (commonly six weeks).
— No portion of the wet detention pond should be fertilized after the first initial
fertilization that is required to establish the plants on the vegetated shelf.
— Stable groundcover should be maintained in the drainage area to reduce the
sediment load to the wet detention basin.
If the basin must be drained for an emergency or to perform maintenance, the
flushing of sediment through the emergency drain should be minimized to the
maximum extent practical.
— Once a year, a dam safety expert should inspect the embankment.
After the wet detention pond is established, it should be inspected once a month and
within 24 hours after every storm event greater than 1.0 inches (or 1.5 inches if in a
Coastal County). Records of operation and maintenance should be kept in a known set
location and must be available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element:
Potentialproblem:
How I will remediate theproblem:
The entire BMP
Trash/debris is present.
Remove the trash/debris.
The perimeter of the wet
Areas of bare soil and/or
Regrade the soil if necessary to
detention basin
erosive gullies have formed.
remove the gully, and then plant a
ground cover and water until it is
established. Provide lime and a
one-time fertilizer application.
Vegetation is too short or too
Maintain vegetation at a height of
long.
approximately six inches.
Page 1 of 4

BMP element:
Potential roblem.-
How I will remediate theproblem:
The inlet device: pipe or
The pipe is clogged.
Unclog the pipe. Dispose of the
swale
sediment off -site.
The pipe is cracked or
Replace the pipe.
otherwise damaged.
Erosion is occurring in the
Regrade the swale if necessary to
swale.
smooth it over and provide erosion
control devices such as reinforced
turf matting or riprap to avoid
future problems with erosion.
The forebay
Sediment has accumulated to
Search for the source of the
a depth greater than the
sediment and remedy the problem if
original design depth for
possible. Remove the sediment and
sediment storage.
dispose of it in a location where it
will not cause impacts to streams or
the BMP.
Erosion has occurred.
Provide additional erosion
protection such as reinforced turf
matting or riprap if needed to
Prevent future erosion problems.
Weeds are present.
Remove the weeds, preferably by
hand. If pesticide is used, wipe it on
the plants rather than spraying.
The vegetated shelf
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 necessa
Weeds are present.
Remove the weeds, preferably by
hand. If pesticide is used, wipe it on
the plants rather than spraying.
The main treatment area
Sediment has accumulated to
Search for the source of the
a depth greater than the
sediment and remedy the problem if
original design sediment
possible. Remove the sediment and
storage depth.
dispose of it in a location where it
will not cause impacts to streams or
the BMP.
Algal growth covers over
Consult a professional to remove
50% of the area.
and control the algal growth.
Cattails, phragmites or other
Remove the plants by wiping them
invasive plants cover 50% of
with pesticide (do not spray).
the basin surface.
Page 2 of 4

BMP element:
Potentialproblem:
How I will remediate theproblem:
The embankment
Shrubs have started to grow
Remove shrubs immediately.
on the embankment.
Evidence of muskrat or
Use traps to remove muskrats and
beaver activity is present.
consult a professional to remove
beavers.
A tree has started to grow on
Consult a dam safety specialist to
the embankment.
remove the tree.
An annual inspection by an
Make all needed repairs.
appropriate professional
shows that the embankment
needs repair. if applicable)
The outlet device
Clogging has occurred.
Clean out the outlet device. Dispose
of the sediment off -site.
The outlet device is damaged
Repair or replace the outlet device.
The receiving water
Erosion or other signs of
Contact the Town of Chapel Hill
damage have occurred at the
Stormwater Department at 969-7246
outlet.
The measuring device used to determine the sediment elevation shall be such
that it will give an accurate depth reading and not readily penetrate into
accumulated sediments.
When the permanent pool depth reads 2.5 feet in the main pond, the sediment
shall be removed.
When the permanent pool depth reads 2.0 feet in the forebay, the sediment shall
be removed.
Sediment Removal
Bottom F
BASIN DIAGRAM
(fill in the blanks)
Z��g
anen'�
olume
Min.
ediment
Storage
FOREBAY
Permanent Pool Elevation 424.10
Pool
Sediment Removal Elevation - 421_60 ......... Volume
Bottom Elevation 420.60 1 1..g
MAIN POND
Storage
Page 3 of 4

Wet Detention Basin #4 Maintanance and Inspection Checklist
Project Name:
Project Address: .
Owner's Name:
Owner's Address:
Recorded Book and Page Number of the Lot:
BMP Name and Location:
Inspection Date:
Inspector:
Inspector Address[Phone Number:
Date I,ast Inspected:
Maintenance Item
w
`�
a
Comments/Actions Required
1. Debris Clean out
Clear of trash and debris M
2. Vegetation Management
Banks / surrounding areas mowed
M
Unwanted vegetation present
M
Condition of wetland planLs
M
3. Erosion
Evidence of soil erosion on banks or
contributing drainage areas and outlet
M
4. Sedimentation
Forebay inspection (Remove sediment when I -
foot dedicated sediment storage area is full.)
M
Pond inspection (Remove sediment when I-
foot dedicated sediment storage area is full.)
y
5. Energy dissipaters
Condition of dissipater at inlets
M
Condition of dissipater at outfall
M
6. inlet
Condition of pipe and / or swale (cracks, leaks,
sedimentation, woody vegetation)
M
7.Outlet
Condition of orifice (drawdown device)
M
Condition of riser outlet and trash rack
M
8. Emergency spillway and dam
Condition of spillway
Y
Condition of dam (i.e., leaks, holes, woody
vegetation, rodent infestation)
y
9. Mechanical devices
Inspect and exercise all valves and mechanical
devices
Y

10. Visual Inspection
Appearance of water (i.e., sheen, muddy, oily,
clear, algae, etc)
M
Mosquito larvae resent?
M
11. Forebay embankment
Condition of forebay embankment (breached?)
M
12. Water elevation
Is pond at normal pool elevation?
M
13. Miscellaneous
Maintenance responsibility sign in place and
legible
M
W=Weekly, M=Monthly, Q=Quarterly, Y=Yearly
If applicable_ Attach to this form documentation of BMP maintenance escrow account activity. This
may be provided in the form of a bank statement which includes the current balance, as well as deposits
and withdraws for the previous 12 months.
Maintenance Actions Taken: [If any of the above items were marked "U" for unsatisfactory, explain
the actions taken and time table for correction. Attach additional pages as necessary.]
Additional Comments:
I do hereby certify that I conducted an inspection of the BMP described herein. I further certify that at
the time of my inspection said BMP was perfonming properly and was in compliance with the terns and
conditions of the approved maintenance agreement required by the Phase II Post -Construction Storm
Water Ordinance.
Certification:
(Seal)
Inspectors Signature
Date

STORMWATER OPERATIONS AND
MAINTENANCE PLAN
for
Eastwood Housing
Chapel Hill, NC
PIN: 9789693622

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Stormwater Operation and Maintenance Plan
DRY POND
Regular inspection and maintenance are necessary to preserve long-term functionality of Stormwater
Control Measures "SCMs" per the original design intent. This Plan outlines the Town of Chapel Hill
requirements for regular inspection and maintenance of Dry Pond SCMs. The Owner as defined in the
Agreement shall keep a copy of this Stormwater Operations and Maintenance Plan, the SCM Inspection
and Maintenance Log, and a copy of the approved As -Built Plans in a known set location and made
available to the Town of Chapel Hill upon request.
Annual inspections shall be performed by a qualified licensed Professional Engineer or Landscape
Architect. Routine maintenance and inspection shall be performed by a qualified professional with
NCSU Stormwater Inspection and Maintenance Certification or similar certification.
The qualified professional shall maintain a SCM Inspection and Maintenance Log and make available to
the Town of Chapel Hill upon request. All inspections shall be recorded in the log according to the
frequency in the Inspection and Maintenance Table (Table 1 below) and within 24 hours after storm
events that exceed 1.0 inch of rainfall. Any deficit SCM elements noted during inspection shall be
recorded in the log and immediately corrected, repaired, or replaced. All routine and
corrective/emergency maintenance activities shall be recorded in the log. The log template can be
found at the Town of Chapel Hill Stormwater Control Measures website.
An Annual Inspection and Maintenance Report shall be submitted to the Town of Chapel Hill
Stormwater Department. The report shall detail the status of the SCM and maintenance performed as
outlined in the SCM Inspection Report Guidelines. A copy of the annual report shall be submitted to the
Town of Chapel Hill Stormwater Management Division beginning one year after issuance of the
Certificate of Occupancy.
REQUIRED INSPECTION AND MAINTENANCE TASKS FOR DRY PONDS
NOTE: The following inspection and maintenance table is not an exhaustive list of inspection and
maintenance tasks. It is the responsibility of the professional inspecting the facility to perform
comprehensive maintenance for the SCM to be operational.

Table 1: Inspection and Maintenance Provisions for Dry Ponds
FAL1,111hrILY
OF
MAINTENANCE ACTIVITIES
INSPECTIONS
Upon
construction
• Watering is needed twice a week until the grass become established (commonly
completion
6-8 weeks), depending on rainfall.
• Mow grass surface areas to a height of approximately six to eight inches and
remove grass clippings.
Once every
• Check inlet system and outlet device for any obstructions or clogging. Remove
accumulated grit, leaves, and debris and dispose off -site.
quarter
• Inspect for prolonged ponding and bare or eroding areas and make adjustments
as necessary.
• Remove any trash within the dry detention area.
Twice during
the growing
• Pull out weeds or invasives preferably by hand.
season
• Have the embankment inspected by a dam safety expert.
Annually
• Remove woody species on or near the embankment area and within the
maintenance access.
• Inspect all structural elements.
Vegetation
• If the dry detention basin suffers from dead or diseased plants or overgrown
with invasive species, evaluate the source of the problem: soils, hydrology,
species, or plant disease.
o Remediate the problem by selecting new grass species or implementing
an eradication plan for invasives.
o Ensure appropriate plant maintenance is occurring.
o A one-time fertilizer application to establish ground cover is permissible
if a soil test indicates it is necessary. No portion of the dry detention
system shall be fertilized after the initial fertilization that is required to
establish the vegetation.
As needed
• Remediate bare soils or erosive gullies.
(Typical
o In perimeter areas, regrade the soil to remove the gully, plant a ground
Problems)
cover and water until it is established. If soil test shows that the pH has
dropped, dolomitic lime shall be applied as recommended.
o Within the pretreatment area, provide erosion control devices such as
reinforced turf matting or riprap to avoid future problems with erosion.
• If soil test shows that the pH has dropped, dolomitic lime shall be applied as
recommended.
Structural integrity
• Replace or repair any cracked, separated or damaged inlet pipes, outfalls,
impoundment walls or other structural elements.
• If a tree has started to grow on the embankment, consult a dam safety specialist
to remove the tree.

• If the dam embankment or emergency spillway needs maintenance, consult with
a professional.
Functionality
• Sediment Accumulation
o Maintain stable ground cover in the drainage area.
o Sweep or vacuum sediment on pavement in the contributing drainage
area.
o If sediment has accumulated in the forebay reducing its depth to 75% of
the original design depth, remove the sediment and dispose of it in a
location where it will not impact the SCM or any stream. Search for the
source of the sediment in the drainage area and remedy the problem if
possible.
• If there is standing water more than 5 days after a storm event, inspect the
outlet device for obstructions and unclog immediately.
• If seepage is observed on the downstream face or other functional issues occur,
consult an appropriate professional.
• If evidence of a muskrat or beaver activity is observed, contact a professional to
remove muskrat or beaver.
For additional information or if damage has occurred at the outlet which effects the
receiving water, contact the Town at Chapel Hill Stormwater Management at 919-
969-7246 (RAIN).

STORMWATER OPERATIONS AND
MAINTENANCE PLAN
for
Police Station
Chapel Hill, NC
PIN: 9789413949

PRELIMINARY PLAT
NOT FOR RECORDING, SALES
OR CONVEYANCE.
THIS DOCUMENT WAS PREPARED FOR
ILLUSTRATION PURPOSES ONLY.
I FOR NRIHER INFORIUATON:
\
T _ ----- CONTA T1E ENGINEER/SURVEYOR
----- AS NOTED.
QUIPMENT /
\ I
�n1 I TREE PROTItCTION FEN6E \
CHPD I i1 i1 ! /nn�/ I`Q - o /
/ CONCRETE FES
INVERT -IN: 96.5
CUT SLOPES TO BE LINED
WITH RIP -RAP
PROPOSED SITE TOPOGRAPHY
CHAPEL HILL TOWNSHIP, ORANGE COUNTY NORTH CAROLINA
SURVEr W. THOMAS F. BICK, PLS
SCALE 1" = 20'
DATE: 07/31/09
PIN` 9789-41-3949
DRAWN BY. MDR/TFB
nLE NAME. Police—Station—lot.dwg
OWNER:
CHAPEL HILL POLICE DEPARTMENT
SURVEYED MR.
OWNER
TOWN OF CHAPEL HILL
405 MARTIN LUTHER KING JR BLVD
CHAPEL HILL, NC 27514
CUT VOLUME: 174.25 CY
FILL VOLUME: 599.74 CY (20% SHRINKAGE APPLIED)
NET FILL: 425.49 CY
20 0 20 40 60
GRAPHIC SCALE - FEET
0
w
CK DAM

Applicable to SCM#1
Stormwater Operation and Maintenance Plan
BIORETENTION CELL
Regular inspection and maintenance are necessary to preserve long-term functionality of Stormwater
Control Measures "SCMs" per the original design intent. This Plan outlines the Town of Chapel Hill
requirements for regular inspection and maintenance of Bioretention Cell SCMs. The Owner as defined
in the Agreement shall keep a copy of this Stormwater Operations and Maintenance Plan, the SCM
Inspection and Maintenance Log, and a copy of the approved As -Built Plans in a known set location and
made available to the Town of Chapel Hill upon request.
Annual inspections shall be performed by a qualified licensed Professional Engineer or Landscape
Architect. Routine maintenance and inspection shall be performed by a qualified professional with
NCSU Stormwater Inspection and Maintenance Certification or similar certification.
The qualified professional shall maintain a SCM Inspection and Maintenance Log and make available to
the Town of Chapel Hill upon request. All inspections shall be recorded in the log according to the
frequency in the Inspection and Maintenance Table (Table 1 below) and within 24 hours after storm
events that exceed 1.0 inch of rainfall. Any deficit SCM elements noted during inspection shall be
recorded in the log and immediately corrected, repaired, or replaced. All routine and
corrective/emergency maintenance activities shall be recorded in the log. The log template can be
found at the Town of Chapel Hill Stormwater Control Measures website.
An Annual Inspection and Maintenance Report shall be submitted to the Town of Chapel Hill
Stormwater Department. The report shall detail the status of the SCM and maintenance performed as
outlined in the SCM Inspection Report Guidelines. A copy of the annual report shall be submitted to the
Town of Chapel Hill Stormwater Management Division beginning one year after issuance of the
Certificate of Occupancy.
REQUIRED INSPECTION AND MAINTENANCE TASKS FOR BIORETENTION CELL
NOTE: The following inspection and maintenance table is not an exhaustive list of inspection and
maintenance tasks. It is the responsibility of the professional inspecting the facility to perform
comprehensive maintenance for the SCM to be operational.

Table 1: Inspection and Maintenance Provisions for Bioretention Cell
OF
MAINTENANCE ACTIVITIES
INSPECTIONSFREQUENCY
• Watering is needed twice a week until the plants become established (commonly
Upon
6-8 weeks) and then as needed during first growing season (April -October),
construction
depending on rainfall.
completion
• Remove and replace dead plants.
• Remove any tree stakes or wires six months after planting.
• Mow any bioretention with turf cover to a height of approximately six to eight
inches and remove grass clippings.
Once every
• Check inlet, collection system and outlet device for clogging. Remove
accumulated grit, leaves, debris and any other obstructions and dispose off -site.
quarter
. Inspect for ponding and bare or eroding areas and make adjustments as
necessary.
• Remove trash and/or debris from the bioretention area.
Twice during
the growing
• Pull out weeds and dead, diseased, or invasives plants preferably by hand.
season
• For bioretention areas without turf cover, supplement triple shredded hard wood
mulch in devoid areas to maintain a maximum 3 inch layer.
• Prune trees and shrubs to best professional practice. Thin vegetation so that
Annually
sunlight can penetrate the bioretention surface.
• Inspect the observation/cleanout wells to ensure that the underdrain is
functioning. If clogging has occurred, wash out the underdrain.
• Inspect all structural elements.
• Conduct a soil test for pH and heavy metals and determine the infiltration rate.
• For bioretention areas without turf cover, remove and replace the mulch layer
Once every
with triple shredded hard wood. The ideal time to reapply mulch is in the late
2-3 years
spring.
. An extensive replanting is required if 50% minimum coverage throughout the
basin is not achieved in the bioretention after the second growing season.
Once every 5
• Perform facility "make -over" to maintain intended landscaping regime and
to 7 years
address any maintenance problems detected during routine inspections. After 5
growing seasons, the vegetation should achieve 75/ coverage.
Vegetation
As Needed
• If the bioretention cell suffers from dead or diseased plants or overgrown with
(Typical
invasive species, evaluate the source of the problem: soils, hydrology, species,
Problems)
and/or type of disease to determine the cause of the plant failure.
o Remediate the problem by selecting new species and/or implementing an
eradication plan for invasives.

o Ensure appropriate plant maintenance is occurring.
o A one-time fertilizer application to establish ground cover is permissible if
a soil test indicates it is necessary. No portion of the dry detention system
shall be fertilized after the initial fertilization that is required to establish
the vegetation.
o Consult with the Town of Chapel Hill Stormwater Management Division
before any aquatic herbicide is used and site specific approval is given.
• If vegetation coverage is not achieved, add reinforcement planting to maintain
desired vegetation density and/or split out perennials to increase plant cover.
Desired vegetation coverage is 50% after 2 growing seasons and 75% after 5
growing seasons
• Remediate bare soils or erosive gullies.
o In perimeter areas, regrade the soil to remove the gully, plant a ground
cover and water until it is established. If soil test shows that the pH has
dropped, dolomitic lime shall be applied as recommended.
o Within the pretreatment area, provide erosion control devices such as
reinforced turf matting or riprap to avoid future problems with erosion.
Filter Media Failure
• If the bioretention area shows signs of clogging, identify source of sediment and
work to remediate or eliminate it before proceeding with the following
maintenance tasks.
o Flush the underdrains and capture any sediment before it enters any
downstream stream or storm drain system.
o Conduct one or more test pits to determine the depth of soil
contamination.
o Before remediating the filter bed, remove and temporary store any plants.
o Remove the accumulated sediment to the point where sediment is no
longer observed in the soil media plus an additional 2 inches of soil. Either
replace with new media or till 2 to 3 inches of sand into the upper 8 to 12
inches of soil.
o Dispose of any removed soil in an appropriate off -site location.
o Replant and mulch the area of disturbance.
• If soil test shows that the pH has dropped, dolomitic lime shall be applied as
recommended.
• If the soil test shows that heavy metals have accumulated, the toxic soils shall be
removed, disposed of properly, and replaced with new planting media.
Structural Integrity
• Replace or repair any cracked, separated or damaged inlet pipes, drop inlets,
overflow structure, outfalls, impoundment walls or other structural elements.
Functionality
• If flow is bypassing the pretreatment area, regrade to route all flow to the
pretreatment area.
• Sediment Accumulation
o Maintain stable ground cover in the drainage area.

o Sweep or vacuum sediment on pavement in the contributing drainage
area.
o If sedimentation or clogging is occurring in the inlet, design modification
may be needed to ensure adequate drop or slope between inlet and filter
bed.
o If sediment has accumulated in the forebay area or basin reducing its
depth to 75% of the original design depth, remove the sediment,
restabilize the area, and replace with clean rock. Search for the source of
the sediment in the drainage area and remedy the problem if possible.
• If greater than one feet of localized bed sinking and/or sediment is observed by
the underdrain or overflow, conduct a test pit excavation by hand to examine
subsurface conditions. Look for sediment across layers, discoloration, voids, loss
of material. Cause of bed sinking may be breached material layers, poor
connections, or damaged pipes. Repair the test pit to full functionality without
cross contamination of the individual material layers.
For additional information or if damage has occurred at the outlet which effects the
receiving water, contact the Town at Chapel Hill Stormwater Management at 919-
969-7246 (RAIN).

STORMWATER OPERATIONS AND
MAINTENANCE PLAN
for
Fire Station #2
Chapel Hill, NC
PIN: 9798350019

S ORMWA'iER MANAGEMENT FACUIW CONSTRUCTION SPECEnCAnONS
GENERAL NOIES
STORMWATER SYSTEM MATERIAL SPFCIFICATIONS
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Stormwater Operations and Maintenance Plan
STORMFILTER
Regular inspection and maintenance are necessary to preserve long-term functionality of Stormwater
Control Measures "SCMs" per the original design intent. This Plan outlines the Town of Chapel Hill
requirements for regular inspection and maintenance of StormFilter SCMs. The Owner as defined in the
Agreement shall keep a copy of this Stormwater Operations and Maintenance Plan, any applicable
proprietary manufacturer's O&M Plan, the SCM Inspection and Maintenance Log, and a copy of the
approved As -Built Plans in a known set location and made available to the Town of Chapel Hill upon
request.
Annual inspections shall be performed by a qualified licensed Professional Engineer or Landscape
Architect. Routine maintenance and inspection shall be performed by a qualified professional with
NCSU Stormwater Inspection and Maintenance Certification or similar certification.
The qualified professional shall maintain a SCM Inspection and Maintenance Log and make available to
the Town of Chapel Hill upon request. All inspections shall be recorded in the log according to the
frequency in the Inspection and Maintenance Table (Table 1 below) and within 24 hours after storm
events that exceed 1.0 inch of rainfall. Any deficit SCM elements noted during inspection shall be
recorded in the log and immediately corrected, repaired, or replaced. All routine and
corrective/emergency maintenance activities shall be recorded in the log. The log template can be
found at the Town of Chapel Hill Stormwater Control Measures website.
An Annual Inspection and Maintenance Report shall be submitted to the Town of Chapel Hill
Stormwater Department. The report shall detail the status of the SCM and maintenance performed as
outlined in the SCM Inspection Report Guidelines. A copy of the annual report shall be submitted to the
Town of Chapel Hill Stormwater Management Division beginning one year after issuance of the
Certificate of Occupancy.
REQUIRED INSPECTION AND MAINTENANCE TASKS FOR STORMFILTERS
NOTE: The following inspection and maintenance table is not an exhaustive list of inspection and
maintenance tasks. It is the responsibility of the professional inspecting the facility to perform
comprehensive maintenance for the SCM to be operational.

Table 1: Inspection and Maintenance Provisions for StormFilters
• Check inlet, outlet, flow diversion structure and conveyance system for any
obstructions, clogging, or damage. Remove accumulated grit, leaves, and debris
and dispose off -site.
• Remove any trash or debris present within the drainage area.
Once Every
• Inspect the condition of the StormFilter including the external condition of the
Quarter unit and any accumulation of liquids or solids within the unit.
o Record the level of sediment build-up on the floor of the vault, in the
forebay, and on top of the cartridges.
o Estimate the flow from the drainage pipe and note if bypass of the
cartridges is occurring. If bypass is observed, maintenance is needed
immediately.
Structural Integrity
• Replace or repair any cracked, separated or damaged inlet pipes, flow diversion
structure, outfalls, or other structural elements.
Functionality
• Sediment Accumulation
o Maintain stable ground cover in the drainage area.
o Sweep or vacuum sediment on pavement in the contributing drainage area.
As Needed o Identify and eliminate any sources of excessive oil loading.
(Typical
• Cartridge Failure
Problems) o If StormFilter Cartridges are not performing as designed, review the Contech
StormFilter Inspection and Maintenance Procedures to determine
maintenance actions.
o Replace cartridges per manufacturer's recommendations.
o Any accumulated sediment in the StormFilter must be disposed to a waste
handling facility.
For additional information or if damage has occurred at the outlet which effects the
receiving water, contact the Town at Chapel Hill Stormwater Management at 919-
969-7246 (RAIN).

1
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STORMWATER OPERATIONS AND
MAINTENANCE PLAN
for
Homestead Aquatic Center
Chapel Hill, NC
PIN: 9880127274

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' SCM #1 - Wet Pond 1 � 9WO.
i
Ll

Applicable to SCM #1
Stormwater Operation and Maintenance Plan
WET POND
Regular inspection and maintenance are necessary to preserve long-term functionality of Stormwater
Control Measures "SCMs" per the original design intent. This Plan outlines the Town of Chapel Hill
requirements for regular inspection and maintenance of Wet Pond SCMs. The Owner as defined in the
Agreement shall keep a copy of this Stormwater Operations and Maintenance Plan, the SCM Inspection
and Maintenance Log, and a copy of the approved As -Built Plans in a known set location and made
available to the Town of Chapel Hill upon request.
Annual inspections shall be performed by a qualified licensed Professional Engineer or Landscape
Architect. Routine maintenance and inspection shall be performed by a qualified professional with
NCSU Stormwater Inspection and Maintenance Certification or similar certification.
The qualified professional shall maintain a SCM Inspection and Maintenance Log and make available to
the Town of Chapel Hill upon request. All inspections shall be recorded in the log according to the
frequency in the Inspection and Maintenance Table (Table 1 below) and within 24 hours after storm
events that exceed 1.0 inch of rainfall. Any deficit SCM elements noted during inspection shall be
recorded in the log and immediately corrected, repaired, or replaced. All routine and
corrective/emergency maintenance activities shall be recorded in the log. The log template can be
found at the Town of Chapel Hill Stormwater Control Measures website.
An Annual Inspection and Maintenance Report shall be submitted to the Town of Chapel Hill
Stormwater Department. The report shall detail the status of the SCM and maintenance performed as
outlined in the SCM Inspection Report Guidelines. A copy of the annual report shall be submitted to the
Town of Chapel Hill Stormwater Management Division beginning one year after issuance of the
Certificate of Occupancy.
REQUIRED INSPECTION AND MAINTENANCE TASKS FOR WET POND
NOTE: The following inspection and maintenance table is not an exhaustive list of inspection and
maintenance tasks. It is the responsibility of the professional inspecting the facility to perform
comprehensive maintenance for the SCM to be operational.

Table 1: Inspection and Maintenance Provisions for Wet Pond
Feutliji
OF
MAINTENANCE ACTIVITIES
INSPECTIONS
Upon
• Watering is needed twice a week until the plants on the vegetated shelf and
completion of
perimeter of the basin become established (commonly 6-8 weeks), depending
construction
on rainfall.
• Mow grass surface areas to a height of approximately six to eight inches and
remove grass clippings.
• Check inlet system/forebay and outlet device for any obstructions or clogging.
Once a quarter
Remove accumulated grit, leaves, and debris and dispose off -site.
• Remove any trash within the pond area.
• Inspect for ponding and bare or eroding areas and make adjustments before the
next rainfall as necessary.
Twice during
the growing
• Pull out dead or diseased plants, weeds, or invasives preferably by hand.
season
• Have the embankment inspected by a dam safety expert.
• Remove woody species on or near embankment area and maintenance access.
Annually
A dam safety specialist should be consulted to remove any trees.
• Prune trees and shrubs to best professional practice. Thin vegetation so that
sunlight can penetrate the pond surface.
Vegetation
• If the wet pond suffers from dead or diseased plants or overgrown with invasive
species, evaluate the source of the problem: soils, hydrology, species, and/or
type of disease to determine the cause of the plant failure.
o Remediate the problem by selecting new species and/or implementing
an eradication plan for invasives.
o Ensure appropriate plant maintenance is occurring.
o A one-time fertilizer application to establish ground cover is permissible
As needed
if a soil test indicates it is necessary. No portion of the wet pond system
(Typical
shall be fertilized after the initial fertilization that is required to establish
Problems)
the vegetation.
o Consult with the Town of Chapel Hill Stormwater Management Division
If algal growth covers 50% of the area, consult a professional to remove
and control the algal growth.
• If cattails, phragmites, or other invasive plants exceed 50% of the wet pond,
remove invasives by physical removal or wiping them with a herbicide. Consult
the Town of Chapel Hill before any aquatic herbicide is used. Site specific
approval is required. Extended periods of dewatering may be a possible
treatment approach for reducing invasives.

• Remediate bare soils or erosive gullies.
o In perimeter areas, regrade the soil to remove the gully, plant a ground
cover and water until it is established. If soil test shows that the pH has
dropped, dolomitic lime shall be applied as recommended.
o Within the pretreatment area, provide erosion control devices such as
reinforced turf matting or riprap to avoid future problems with erosion.
Structural integrity
• Replace or repair any cracked, separated or damaged inlet pipes, outfalls,
impoundment walls or other structural elements.
• If dam embankment or emergency spillway needs maintenance, consult with a
professional.
Functionality
• Sediment Accumulation
o Maintain stable ground cover in the drainage area.
o Sweep or vacuum sediment on pavement in the contributing drainage
area.
o If sedimentation or clogging is occurring in the inlet, design modification
may be needed to ensure adequate drop or slope between inlet and
filter bed.
o If sediment has accumulated in the forebay area reducing its depth to
75% of the original design depth, remove the sediment off site,
restabilize the area, and replace with clean rock. Search for the source
of the sediment in the drainage area and remedy the problem if possible.
• If there are visible disturbances to the forebay design, make the necessary
repairs to ensure that the forebay is functioning as intended.
• If evidence of a muskrat or beaver activity is observed, contact a professional to
remove muskrat or beaver.
• If the basin must be drained for an emergency or to perform maintenance, the
flushing of sediment through the emergency drain should be minimized to the
maximum extent practical.
For additional information or if damage has occurred at the outlet which effects the
receiving water, contact the Town at Chapel Hill Stormwater Management at 919-
969-7246 (RAIN).

Applicable to SCM #2
Stormwater Operation and Maintenance Plan
BIORETENTION CELL
Regular inspection and maintenance are necessary to preserve long-term functionality of Stormwater
Control Measures "SCMs" per the original design intent. This Plan outlines the Town of Chapel Hill
requirements for regular inspection and maintenance of Bioretention Cell SCMs. The Owner as defined
in the Agreement shall keep a copy of this Stormwater Operations and Maintenance Plan, the SCM
Inspection and Maintenance Log, and a copy of the approved As -Built Plans in a known set location and
made available to the Town of Chapel Hill upon request.
Annual inspections shall be performed by a qualified licensed Professional Engineer or Landscape
Architect. Routine maintenance and inspection shall be performed by a qualified professional with
NCSU Stormwater Inspection and Maintenance Certification or similar certification.
The qualified professional shall maintain a SCM Inspection and Maintenance Log and make available to
the Town of Chapel Hill upon request. All inspections shall be recorded in the log according to the
frequency in the Inspection and Maintenance Table (Table 1 below) and within 24 hours after storm
events that exceed 1.0 inch of rainfall. Any deficit SCM elements noted during inspection shall be
recorded in the log and immediately corrected, repaired, or replaced. All routine and
corrective/emergency maintenance activities shall be recorded in the log. The log template can be
found at the Town of Chapel Hill Stormwater Control Measures website.
An Annual Inspection and Maintenance Report shall be submitted to the Town of Chapel Hill
Stormwater Department. The report shall detail the status of the SCM and maintenance performed as
outlined in the SCM Inspection Report Guidelines. A copy of the annual report shall be submitted to the
Town of Chapel Hill Stormwater Management Division beginning one year after issuance of the
Certificate of Occupancy.
REQUIRED INSPECTION AND MAINTENANCE TASKS FOR BIORETENTION CELL
NOTE: The following inspection and maintenance table is not an exhaustive list of inspection and
maintenance tasks. It is the responsibility of the professional inspecting the facility to perform
comprehensive maintenance for the SCM to be operational.

Table 1: Inspection and Maintenance Provisions for Bioretention Cell
OF
MAINTENANCE ACTIVITIES
INSPECTIONSFREQUENCY
• Watering is needed twice a week until the plants become established (commonly
Upon
6-8 weeks) and then as needed during first growing season (April -October),
construction
depending on rainfall.
completion
• Remove and replace dead plants.
• Remove any tree stakes or wires six months after planting.
• Mow any bioretention with turf cover to a height of approximately six to eight
inches and remove grass clippings.
Once every
• Check inlet, collection system and outlet device for clogging. Remove
accumulated grit, leaves, debris and any other obstructions and dispose off -site.
quarter
. Inspect for ponding and bare or eroding areas and make adjustments as
necessary.
• Remove trash and/or debris from the bioretention area.
Twice during
the growing
• Pull out weeds and dead, diseased, or invasives plants preferably by hand.
season
• For bioretention areas without turf cover, supplement triple shredded hard wood
mulch in devoid areas to maintain a maximum 3 inch layer.
• Prune trees and shrubs to best professional practice. Thin vegetation so that
Annually
sunlight can penetrate the bioretention surface.
• Inspect the observation/cleanout wells to ensure that the underdrain is
functioning. If clogging has occurred, wash out the underdrain.
• Inspect all structural elements.
• Conduct a soil test for pH and heavy metals and determine the infiltration rate.
• For bioretention areas without turf cover, remove and replace the mulch layer
Once every
with triple shredded hard wood. The ideal time to reapply mulch is in the late
2-3 years
spring.
. An extensive replanting is required if 50% minimum coverage throughout the
basin is not achieved in the bioretention after the second growing season.
Once every 5
• Perform facility "make -over" to maintain intended landscaping regime and
to 7 years
address any maintenance problems detected during routine inspections. After 5
growing seasons, the vegetation should achieve 75/ coverage.
Vegetation
As Needed
• If the bioretention cell suffers from dead or diseased plants or overgrown with
(Typical
invasive species, evaluate the source of the problem: soils, hydrology, species,
Problems)
and/or type of disease to determine the cause of the plant failure.
o Remediate the problem by selecting new species and/or implementing an
eradication plan for invasives.

o Ensure appropriate plant maintenance is occurring.
o A one-time fertilizer application to establish ground cover is permissible if
a soil test indicates it is necessary. No portion of the dry detention system
shall be fertilized after the initial fertilization that is required to establish
the vegetation.
o Consult with the Town of Chapel Hill Stormwater Management Division
before any aquatic herbicide is used and site specific approval is given.
• If vegetation coverage is not achieved, add reinforcement planting to maintain
desired vegetation density and/or split out perennials to increase plant cover.
Desired vegetation coverage is 50% after 2 growing seasons and 75% after 5
growing seasons
• Remediate bare soils or erosive gullies.
o In perimeter areas, regrade the soil to remove the gully, plant a ground
cover and water until it is established. If soil test shows that the pH has
dropped, dolomitic lime shall be applied as recommended.
o Within the pretreatment area, provide erosion control devices such as
reinforced turf matting or riprap to avoid future problems with erosion.
Filter Media Failure
• If the bioretention area shows signs of clogging, identify source of sediment and
work to remediate or eliminate it before proceeding with the following
maintenance tasks.
o Flush the underdrains and capture any sediment before it enters any
downstream stream or storm drain system.
o Conduct one or more test pits to determine the depth of soil
contamination.
o Before remediating the filter bed, remove and temporary store any plants.
o Remove the accumulated sediment to the point where sediment is no
longer observed in the soil media plus an additional 2 inches of soil. Either
replace with new media or till 2 to 3 inches of sand into the upper 8 to 12
inches of soil.
o Dispose of any removed soil in an appropriate off -site location.
o Replant and mulch the area of disturbance.
• If soil test shows that the pH has dropped, dolomitic lime shall be applied as
recommended.
• If the soil test shows that heavy metals have accumulated, the toxic soils shall be
removed, disposed of properly, and replaced with new planting media.
Structural Integrity
• Replace or repair any cracked, separated or damaged inlet pipes, drop inlets,
overflow structure, outfalls, impoundment walls or other structural elements.
Functionality
• If flow is bypassing the pretreatment area, regrade to route all flow to the
pretreatment area.
• Sediment Accumulation
o Maintain stable ground cover in the drainage area.

o Sweep or vacuum sediment on pavement in the contributing drainage
area.
o If sedimentation or clogging is occurring in the inlet, design modification
may be needed to ensure adequate drop or slope between inlet and filter
bed.
o If sediment has accumulated in the forebay area or basin reducing its
depth to 75% of the original design depth, remove the sediment,
restabilize the area, and replace with clean rock. Search for the source of
the sediment in the drainage area and remedy the problem if possible.
• If greater than one feet of localized bed sinking and/or sediment is observed by
the underdrain or overflow, conduct a test pit excavation by hand to examine
subsurface conditions. Look for sediment across layers, discoloration, voids, loss
of material. Cause of bed sinking may be breached material layers, poor
connections, or damaged pipes. Repair the test pit to full functionality without
cross contamination of the individual material layers.
For additional information or if damage has occurred at the outlet which effects the
receiving water, contact the Town at Chapel Hill Stormwater Management at 919-
969-7246 (RAIN).