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Infiltration Practices 2014 - Infiltration Practices

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Submitreport

to:



CityofLynchburg



525TaylorStreet

Lynchburg,Virginia24501



Attn:StormwaterBMP

434‐455‐4250



INFILTRATIONPRACTICES:O&MCHECKLIST–VirginiaStormwaterManagementHandbook,Chapter9‐C.9.0.

InspectionDate

Project SitePlan/PermitNumber

Location DateBMPPlacedinService

DateofLastInspection Inspector

Owner/Owner’sRepresentative

As‐BuiltPlansavailable: Y/N

FacilityType:Level1____________________________Level2

FacilityLo

cation:

 Surface

 Underground

FiltrationMedia:

 Nofiltration(e.g.,drywell,

permeablepavement,infiltration

facility,etc.

 Sand

 BioretentionSoil

 Peat

 Other:_____________________

HydraulicConfiguration:

 On‐linefacility

 Off‐linefacility

TypeofPre‐TreatmentFacility:

 Sedimentforebay(aboveground)

 Sedimenta

tionchamber

 Plungepool

 Stonediaphragm

 Grassfilterstrip

 Grasschannel

 Other:_____________________

Ideally, infiltration facilities should be inspected annually. Spill Prevention measures should be used around

infiltration facilities when handling substances that contaminate stormwater. Releases of pollutants should be

correctedassoonasid

entified.

ElementofBMP PotentialProblem Y/N HowtoFixProblem



WhoWill

Address

Problem



Comments

Contributing

DrainageArea

Thereisexcessivetrash

anddebris

 Removeimmediately

Owneror

professional



Thereisevidenceof

erosionand/or

exposedsoil

 Stabilizeimmediately

Owneror

professional



Vegetativecoveris

adequate

 Supplementasneeded

Owneror

professional



Thereareexcessive

landscapewasteoryard

clippings



Removeimmediatelyand

recycleorcompost

Owneror

professional



Pre‐Treatment

Facility

Thereisadequate

accesstothepre‐

treatmentfacility

 Establishadequateaccess Professional 

Thereisexcessivetrash,

debris,orsediment.



 Removeimmediately

Owneror

professional



Thereisevidenceof

erosionand/orexposed

soil

 Stabilizeimmediately

Owneror

professional



Thereisevidenceof

clogging(standing

water,noticeable

odors,waterstains,

algaeorfloatingaquatic

vegetation)



Identifyandeliminatethe

sourceoftheproblem.If

necessary,removeand

cleanorreplacethe

cloggedmaterial.

Professional 

Thereisdead

vegetationorexposed

soilinthegrassfilter



Restabilizeand

revegetateasnecessary

Owneror

professional



Inlets

Inletsprovideastable

conveyanceintofacility



Stabilizeimmediately,as

needed.

Owneror

professional



Thereisexcessive

trash/debris/sediment.

 Removeimmediately

Owneror

professional



Thereisevidenceof

erosionatoraround

theinlet



Repairerosiondamage

andreseedorotherwise

restabilizewith

vegetation

Owneror

professional



Embankment,

FlowDiversion

Structures(e.g.,

Dikes,Berms,

etc.)andSide

Slopes

Thereisevidenceof

erosionorbaresoil



Identifythesourceof

erosiondamageand

preventitfromrecurring.

Repairerosiondamage

andreseedorotherwise

restabilizewith

vegetation

Owneror

professional



Thereisexcess

sedimentaccumulation

 Removeimmediately

Owneror

professional



Waterisnotdetainedin

theinfiltrationbasin



Checkforabreachinthe

containmentstructure

andrepairimmediately.

Professional 

Sideslopessupport

nuisanceanimals.



Animalburrowsmustbe

backfilledand

compacted.Burrowing

animalsshouldbe

humanelyremovedfrom

area.

Professional 

ElementofBMP PotentialProblem Y/N HowtoFixProblem



WhoWill

Address

Problem



Comments



Maintaining

FacilityCapacity

andProper

Drainage

Lookforweedygrowth

onthestonesurface

indicatingsediment

accumulationand

potentialclogging



Identifyandcontrol

sourcesofsedimentand

debris.Removesediment

anddebrisinexcessof4”

indepthevery2‐5years

(orsoonerifperformance

isaffected).

Professional



Measurethedraw‐

downrateofthe

observationwellfor

threedaysfollowinga

stormeventinexcessof

1/2inchesindepth.If

standingwaterisstill

observedafterthree

days,thisisaclearsign

thatcloggingisa

problem.



Immediatelycleardebris

fromtheunderdrain.

Replacethe

underdrainif

necessary.Ifneeded,

regradeandtilltorestore

infiltrationcapacity(the

needforthiscanbe

preventedbypreventing

upstreamerosionand

subsequentsediment

transporttothefacility).

Professional 

Thereisexcessive

trash/debris



 Removeimmediately

Owneror

professional



Vegetation

Grasswithinthe

practiceisovergrown



Grassmustbemowedto

aheightof4”‐9”and

grassclippingsremoved

(ideallyrecycledor

composted).

Owneror

professional



Pioneertreesare

sproutinginthebaseof

thefacility



Removetreestoprevent

rootsfrompuncturing

thefilterfabric,allowing

sedimenttoenter

 

Vegetationformsan

overheadcanopythat

maydropleaflitter,

fruitandother

vegetativematerials

thatmaycause

clogging.



Pruneorremove

vegetationasnecessary

Owneror

professional



ObservationWell

Iseachobservationwell

stillcapped?

 Repair,asnecessary. Professional 

Outlet

Outletsareobstructed

orerosionandsoil

exposureisevident

belowtheoutlet.



Removeobstructionsand

stabilizeerodedor

exposedareas.

Owneror

Professional



Evidenceofflow

bypassingfacility

 Repairimmediately Professional 

Thereisexcessivetrash,

debris,orsedimentat

theoutlet

 Removeimmediately

Owneror

professional



ElementofBMP PotentialProblem Y/N HowtoFixProblem



WhoWill

Address

Problem



Comments

Overflowor

Emergency

Spillway

Thepipeorspillwayis

noteffectively

conveyingexcesswater

toanadequate

receivingsystem



Clearsedimentand

debriswhenever25%or

moreoftheconveyance

capacityisblocked.When

damagedpipeis

discovered,itmustbe

repairedorreplaced

immediately.Identifyand

controlsourcesof

erosiondamage.Replace

orreinforcestone

armamentwheneveronly

onelayerofstone

remains.

Professional 

Structural

Components

Evidenceofstructural

deterioration

 Repairasnecessary Professional 

Evidenceofspallingor

crackingofstructural

components



Repairorreplace,as

necessary

Professional 

Gratesareingood

condition



Repairorreplace,as

necessary



Owneror

professional



Accesstothe

Infiltrationfacilityorits

componentsis

adequate



Establishadequate

access.Removewoody

vegetationanddebris

thatmayblockaccess.

Ensurethatmanholes,

valvesand/orlockscan

beopenedandoperated.



Professional 

Thereisevidenceof

standingwater



Fillinlowspotsand

stabilize;correctflow

problemscausing

ponding



Owneror

professional



Overall

Mosquitoproliferation 

Eliminatestandingwater

andestablishvegetation;

treatformosquitoesas

needed.Ifspraysare

considered,thena

mosquitolarvicide,such

asBacillusthurendensis

orAltosideformulations

canbeappliedonlyif

absolutelynecessary.

Owneror

professional



Complaintsfromlocal

residents

 Correctrealproblems

Owneror

professional



Encroachmentonthe

infiltrationareaor

easementbybuildings

orotherstructures



Informinvolvedproperty

ownersofBMPsstatus;

clearlymarkthe

boundariesofthe

receivingperviousarea,

asneeded

Owneror

professional



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Completed 13 July 2020

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