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to:
CityofLynchburg
525TaylorStreet
Lynchburg,Virginia24501
Attn:StormwaterBMP
4344554250
EXTENDEDDETENTIONPONDS:O&MCHECKLISTVirginiaStormwaterManagementHandbook,Chapter9
C.16.0.
InspectionDate
Project SitePlan/PermitNumber
Location DateBMPPlacedinService
DateofLastInspectionInspector
Owner/Owner’sRepresentative
AsBuiltPlansavailable: Y/N
FacilityType:Level1____________________________Level2
Pondcharacteristicsandfunctions
(ch
eckallthatapply)
Waterqualitytreatment
Channelprotection
Tiesintogroundwater
HydraulicConfiguration:
Onlinefacility
Offlinefacility
TypeofPreTreatmentFacility:
Sedimentforebay(aboveground)
Vegetatedbufferarea
Grassfilterstrip
Grass
channel
Other
:___________________
Ideally,ExtendedDetentionPondsshouldbeinspectedannually.EDPondsarepronetoahighcloggingriskatthe
ED lowflow orifice. Ideally, the orifice should be inspected at least twice a year after initial construction. The
constantlychangingwaterlevelsinEDPondsmakeitdiffi
culttomowormanagevegetativegrowth.Thebottomof
ED Pondsoften become soggy,and waterloving tees such as willows may invade and will need to be managed.
Periodicmowingofthestormwaterbufferisonlyrequiredalongmaintenancerightsofwayandtheembankment.
The remaining buffer may be mana
ged as a meadow (mowing every other year) or forest. Frequent removal of
sedimentfromtheforebay(every57years,orwhen50%oftheforebaycapacityisfilled)isessentialtomaintain
thefunctionandperformanceoftheEDPond.SedimentsexcavatedfromEDPondsareusuallyno
tconsideredtoxic
orhazardous,sotheycanbesafelydisposedofeitherbylandapplicationoflandfilling.
ElementofBMP PotentialProblem Y/N HowtoFixProblem
WhoWill
Address
Problem
Comments
Contributing
DrainageArea
Adequatevegetation Supplementasneeded. Owner
Thereisexcessivetrash
anddebris
Removeimmediately.
Owneror
professional
Thereisevidenceof
erosionand/orbareor
exposedsoil
Stabilizeimmediately.
Owneror
professional
Thereisexcessive
landscapewasteand
yardclippings
Removeimmediately.
Owneror
professional
Thereisadequate
accesstothepre
treatmentfacility
Establishadequateaccess Professional
Thereisexcessivetrash
anddebris
Removeimmediately.
Owneror
professional
Thereisevidenceof
erosionand/orexposed
soil.
Immediatelyidentifyandcorrectthe
causeoftheerosionandstabilize
theerodedorbarearea.
Owneror
professional
PreTreatment
Sedimentdepositsare
50%ormoreofforebay
capacity.
Dredgethesedimenttorestorethe
designcapacity;sedimentshouldbe
dredgedfromforebaysatleast
every57years,andearlier,as
needed.
Professional
Thesedimentmarkeris
notvertical.
Adjustthesedimentdepthmarker
toaverticalalignment
Professional
Thereisevidenceof
clogging
Clearblockagesoftheriseror
orifice(s)andmakeother
adjustmentsneededtomeetthe
approveddesignspecifications
Professional
Thereisdead
vegetation
Revegetate,asneeded
Owneror
professional
Inlet
Theinletprovidesa
stableconveyanceinto
thepond
Stabilizeimmediately,asneeded,
andclearblockages.
Owneror
professional
Thereisexcessivetrash,
debris,orsediment.
Removeimmediately
Owneror
professional
Thereisevidenceof
erosion/undercuttingat
oraroundtheinlet
Repairerosiondamageand
restabilize
Owneror
professional
Thereiscracking,
bulging,erosionor
sloughingoftheforebay
dam.
Repairandrestabilizeimmediately. Professional
Thereiswoodygrowth
ontheforebaydam.
Removewithin2weeksof
discovery.
Professional
Thereisevidenceof
nuisanceanimals.
Animalburrowsmustbebackfilled
andcompacted.Burrowinganimals
shouldbehumanelyremovedfrom
thearea.
Professional
Thereismorethan1
inchofsettlement.
Addfillmaterialandcompactthe
soiltothedesigngrade
Owneror
Professional
Theinletalignmentis
incorrect.
Correctimmediately.
Owneror
Professional
ElementofBMP PotentialProblem Y/N HowtoFixProblem
WhoWill
Address
Problem
Comments
Vegetation
Plantcompositionis
consistentwiththe
approvedplans
Determineifexistingplantmaterials
areconsistentwiththegeneralWet
Ponddesigncriteria,andreplace
inconsistentspecies.
Professional
Invasivespeciesare
present.
Removeinvasivespecies
immediatelyandreplacevegetation
asneeded.
Professional
Treesplantedinthe
bufferandonwetland
islandsandpeninsulas
needwateringduring
thefirstgrowingseason
Considerwateringevery3daysfor
firstmonth,andthenweeklyduring
firstyear(AprilOctober),
dependingonrainfall.
Owneror
professional
Grassaroundthefacility
isovergrown
Mow(atleasttwiceayear)toa
heightof4”9”highandremove
grassclippings.
Owneror
professional
Vegetationisdeador
reinforcementplanting
isneeded.
Removeandreplacedeadordying
vegetation.
Professional
PermanentPool
andSideSlopes
Thereisexcessivetrash
and/ordebris.
Removeimmediately
Owneror
professional
Thereisevidenceof
sparsevegetativecover,
erosionorslumping
sideslopes.
Repairandstabilizephysical
damage,andreseedorplant
additionalvegetation.
Owneror
professional
Thereisevidenceof
nuisanceanimals.
Animalburrowsmustbebackfilled
andcompacted.Burrowinganimals
shouldbehumanelyremovedfrm
area.
Owneror
professional
Thereissignificant
sedimentaccumulation.
Conductabathymetricstudyto
determinetheimpacttodesign
volumes,anddredgeifnecessary.
Professional
Riser/Principle
SpillwayandLow
FlowOrifice(s)
Thereisadequate
accesstotheriserfor
maintenance.
Establishadequateaccess Professional
Piecesoftheriserare
deteriorating,
misaligned,brokenor
missing.
Repairimmediately. Professional
Adjustablecontrol
valvesareaccessible
andoperational.
Repair,asneeded. Professional
Reverseslopepipesand
flashboardrisersarein
goodcondition.
Repair,asneeded. Professional
Seepageintoconduit Sealconduit Professional
Thereisevidenceof
clogging
Clearblockagesoftheriseror
orifice(s)andmakeother
adjustmentsneededtomeetthe
approveddesignspecs.
Professional
Thereisexcessivetrash,
debris,orother
obstructionsinthe
trashrack.
Removeimmediately.
Owneror
professional
ElementofBMP PotentialProblem Y/N HowtoFixProblem
WhoWill
Address
Problem
Comments
Dam/
Embankmentand
Abutments
Thereissparseveg.
cover,settlement,
cracking,bulging,
misalignment,erosion
rillsdeeperthan2
inches,orsloughing.
Repairandrestabilizeimmediately,
especiallyaftermajorstorms.
Professional
Therearesoftspots,
seepage,boggyareasor
sinkholes.
Reinforce,fillandstabilize
immediately.
Thereisevidenceof
nuisanceanimals.
Animalburrowsmustbebackfilled
andcompacted.Burrowinganimals
shouldbehumanelyremovedfrom
thearea.
Thereiswoody
vegetationonthe
embankment.
Removalofwoodyspeciesnearor
ontheembankmentand
maintenanceaccessareasshouldbe
donewhendiscovered,butatleast
every2years.
Overflow/
Emergency
Spillway
Thereiswoodygrowth
onthespillway.
Removalofwoodyspeciesnearor
ontheemergencyspillwayshould
bedonewhendiscovered,butat
leastevery2years.
Owneror
professional
Thereisexcessivetrash,
debris,orother
obstructions.
Removeimmediately.
Owneror
professional
Thereisevidenceof
erosion/backcutting
Repairerosiondamageandreseed
Owneror
professional
Therearesoftspots,
seepageorsinkholes.
Reinforce,fillandstabilize
immediately.
Owneror
professional
Onlyonelayerofstone
armoringexistsabove
thenativesoil.
Reinforceripraporotherarmoring
materials.
Professional
Outlet
Theoutletprovidesa
stableconveyancefrom
thepond.
Stabilizeimmediately,asneeded,
andclearblockages.
Owneror
professional
Thereiswoodygrowth
within5feetofthe
outletpipebarrel.
Prunevegetationbacktoleavea
cleardischargearea.
Owneror
Professional
Thereisexcessivetrash,
debris,orother
obstructions.
Removeimmediately.
Owneror
professional
Thereareexcessive
sedimentdepositsat
theoutlet.
Removesediment. Professional
Dischargeiscausing
undercutting,erosionor
displacedriprapator
aroundtheoutlet.
Repair,reinforceorreplaceriprap
asneeded,andrestabilize.
Professional
ElementofBMP PotentialProblem Y/N HowtoFixProblem
WhoWill
Address
Problem
Comments
Overall
Accesstothefacilityor
itscomponentsis
adequate.
Establishadequateaccess.Remove
woodyvegetationanddebristhat
mayblockaccess.Ensurethat
hardwarecanbeopenedand
operated.
Professional
Fencesareinadequate
Collapsedfencesmustberestored
toanuprightposition.Jaggededges
anddamagedfencesmustbe
repairedorreplaced.
Professional
Waterlevelsinoneor
morecellsare
abnormallyhighorlow.
Clearblockagesoftheriseror
orifice(s)andmakeother
adjustmentsneededtomeetthe
approveddesignspecifications.
Professional
Complaintsfromlocal
residents
Correctrealproblems.
Owneror
professional
Mosquitoproliferation
Eliminatestagnantpoolsandstock
thebasinwithmosquitofishto
providenaturalmosquito&midge
control.Treatformosquitoesas
needed.Ifspraying,thenuse
mosquitolarvicide,(e.g.,Bacillus
thurendensisorAltoside
formulations)onlyifabsolutely
necessary.
Owneror
professional
Encroachmentonthe
pondoreasementby
buildingsorother
structures
Informinvolvedpropertyownersof
BMPsstatus;clearlymarkthe
boundariesofthereceivingpervious
area,asneeded
Owneror
professional
Safetysignageisnot
adequate.
Providesufficient,legiblesafety
signage.
Owneror
professional