Appendix II Sample VSMP Stormwater Management Facility ... · Generic Maintenance Inspection...

Inspector CourseAppendix II | of 5

Sample VSMP Authority Stormwater Management Facility

Generic Maintenance Inspection Checklist

The form on the following page is a generic inspection checklist developed by the Center for

Watershed Protection in collaboration with the Department. This form allows an inspector to

quickly assess the performance of a stormwater management (SWM) facility by using simple

visual indicators. It is recommended that these rapid investigations be conducted during every

other routine SWM management facility inspection by a locality to verify BMP performance.

This basic form can be modified, simplified, or customized to meet the unique BMP terminology

and design criteria employed in the locality.


FACILITY ID: DATE: / / ASSESSED BY:

NAME:

ADDRESS:

PHOTO IDS:

HANDHELD/

GPS ID:

SECTION 1- BACKGROUND INFORMATION (GIS)BMP TYPE :

Dry Detention Pond

Extended Detention Pond

Wet Pond

Filter (specify: ______________)

Infiltration (specify:_____________)

Check if structure is underground

Dry Swale

Wet Swale

Grass Channel

Dry Well

Permeable Pavement

Bioretention

Wetland

Level Spreader

WQ Inlet

Proprietary Device

Other

YEAR CONSTRUCTED:

OWNERSHIP

Public Private Unknown

SITE CHARACTERIZATION

DRAINAGE AREA: (acres) IMPERVIOUS COVER: (acres) Discerned from: Plan County Data GIS Field

CONTRIBUTING DRAINAGE AREA (% land use): Note – All percentages should sum up to 100%.

Industrial Commercial Urban/Residential Suburban/Res

Forested Institutional Golf course Park

Crop Pasture Other:

WATER QUALITY VOL

(FROM DESIGN PLAN): (ft3)

SECTION 2- FIELD VISIT

Rain in last 48 hrs? Yes No Evidence of high water table (e.g., excessive soil saturation)? Yes No

DESIGN ELEMENTS

FACILITY SIZE:

Length: (ft)

Width: (ft)

Surface Area: (ft2)

Depth of WQ storage (ft)

OBSERVED WQ STORAGE VOL:(ft3)

HYDRAULIC

CONFIGURATION

On-line Facility

Off-line Facility

DESIGN STORM(S):

Water Quality

Flood Control

Channel Protection

Unknown

BMP SIGNAGE: (check all that apply)

None Flood Warning Stormwater Education No Trespassing Wildlife HabitatPublic Property Do Not Mow Other:

OUTLET CHARACTERISTICS

PRIMARY OUTLET

STRUCTURE:N/A – infiltration w/ no outlet Pipe Riser Weir Large Storm Overflow Open channelLarge Storm By-pass Other:

OUTLET FEATURES:N/A Trash Rack Pond Drain Inverted outlet pipe Hooded outlet Anti-vortex device

Perforated pipe Gravel Diaphragm Micropool outlet Multiple outlet levels

Outlet includes restrictor? Yes No

OUTLET STRUCTURE

CONDITIONS:

Erosion at Outlet: None Slight Moderate Severe

Outlet Clogging: None Slight Moderate Severe

Structural Problems: None Slight Moderate Severe

CONDITIONS AT

OUTFALL:Stream Closed storm sewer Surface channel Road ditch Other:

Unknown

Active Erosion:

Trash:

Sedimentation:

None Slight Moderate Severe



Odor: None Slight Moderate Severe

Algae: None Slight Moderate Severe

Other WQ Problems: None Slight Moderate Severe

Emergency Spillway Type: Channel Riser Overflow Weir Other:


SOIL OR FILTER MEDIATYPE OF FILTER/INFILTRATION MEDIA: (check all that apply)

Soil mix (in) Sand (in) Gravel (in) Large Stone (in)Organic material (in) Other N/A Unknown

Avg. depth of sediment build-up on surface? (in)

SOIL MEDIA SAMPLE: Note – Complete during site investigation, if applicableDominant Soil Type Clay Loam Sand Sand/LoamIs the soil homogenous? Yes No

Comments:

VEGETATION

GENERAL OBSERVATIONS:Landscaped

Aquatic Bench

Invasive Species

Plant Diversity

TYPE OF GROUND COVER (% of Surface Area in Plan View up to low Outlet):Note – All percentages should sum up to 100 %.

Trees Grasses/Perennials Ponded water Other:

Managed Turf Bare Soil Shrubs N/A

Gravel/stone Mulch Emergent wetland

Depth of mulch, if present: Hardwood (in) Pine Straw (in) Other (in)

Rate degree of shading of BMP Surface Area by trees: Well Shaded Some Shading No Shading N/A

INLET CHARACTERISTICS

INLET #1:

Diameter/Width:

(in)

TYPE OF INLET: Open Channel Closed Pipe

Sheet Flow Curb Cut Other:

Elevation difference between bottom of inletand BMP surface:

(in)

INLET SUBMERSION:

Complete

Partial

None

INLET CONDITIONS:

Inlet Erosion

Inlet Clogging

Structural Problems




Comments:

INLET #2:

Diameter/Width:

(in)

TYPE OF INLET: Open Channel Closed Pipe

Sheet Flow Curb Cut Other:

Elevation difference between bottom of inletand BMP surface:

(in)

INLET SUBMERSION:

Complete

Partial

None

INLET CONDITIONS:

Inlet Erosion

Inlet Clogging

Structural Problems




Comments:

PRETREATMENTTYPE OF PRETREATMENT (check all that apply) PRETREATMENT FUNCTION By design Incidental

Is pretreatment functioning? Yes NoIs sediment removal necessary? Yes NoSigns of pretreatment bypass? Yes No

Signs of flow of sediment from pretreatment to BMP? Yes No

Severity: Slight Moderate Severe

None

Sediment Forebay ( ft3)Grass ChannelRiprap Channel or Apron

Grass Filter StripPlunge Pool?Stone DiaphragmOther:

GENERAL DESIGN

BMP FEATURES (check all that apply)

Maintenance AccessFenceMulti-cellMicropoolImpermeable Liner

UnderdrainClean OutObservation WellIs water present in observation well?

Yes No Depth: ft

Pond DrainOther:

CONVEYANCE THROUGH BMP

No Defined Channel

Low Flow Channel

Concrete Eroded Earthen Other ____________

Length of Shortest Flow Path: (ft)

Is BMP designed with a Permanent Pool? Yes No


PERFORMANCE

GENERAL PROBLEMS: (check all that apply)

Maintenance Needed

Water Bypass of Inlet

Water Bypass of Outlet

Incorrect Flow Paths

Short-circuiting of treatment mechanism

No or ineffective treatment

Ineffective pretreatment

Others ________________________ __

Erosion at Embankments

Erosion within Facility

Deposition within Facility

Inappropriate Ponding of Water

Clogged Pond Drain/Underdrain

Clogged Media

Inappropriate media material

Inappropriate underlying soil (infiltration)

Permanent Pools not stable

Inadequate vegetation

Dead or Diseased Vegetation

Too many invasive plants

Trees on Embankment

Failing structural components

Safety issue (Note:________________)

WATER QUALITY IN FACILITY: N/A EVIDENCE OF:

Geese

Animal Burrows

Mosquitoes

BMP Alteration

Algae

Odor

Turbidity

Color




Normal Abnormal:

PROBLEM 1=NONE 2 - FEW 3 – SEVERAL 4-SEVERE

TRASH No evidence of trashA few pieces of trash

throughout BMPTrash accumulation near

inlet/outletLots of trash in BMP orBMP used for storage

BMP BANK EROSION No noticeable erosionSlight erosion

< 5% of bank affected

Moderate erosion

~15% of bank affectedBanks severely eroded,>25% of bank affected

SEDIMENT DEPOSITIONNo sedimentdeposition

Areas of minor sedimentdeposition

Areas of somedeposition, may be

severe near inlet/outlets

Lots of depositionresulting in pond bottom

clogging

SURFACE

SLOPE

0-1% BMP surfaceslope

1-3% BMP surface slopeor steeper slopes with

check dams,

3-5% BMP surface slopewith no check dams,

>5% surface slope;

SIDE SLOPESBMP side slopes 3:1

or flatterBMP side slopes 2:1 Steep BMP side slopes Risk of side slope failure

STRUCTURALNo evidence of

structural damage

Minor problems (e.g.,bank slump, eroded

channels)

Moderate structuralproblems –failure

pending

Structural failures (e.g.,bank failure, blowout)

VISIBILITYHigh visibility, near

high-traffic areasSome visibility, near

traffic areasLimited visibility, near

low traffic areasNo visibility, behindbuildings or fences

ACCESSIBILITYMaintained accessarea for vehicles

Access area designated,but not maintained

Access for vehicles notdesignated

Access for vehicles notpossible

VEG

COVER

No mowingin/around BMP

Mowing along BMPedges but areas of nomow in BMP bottom

Mowed turf vegetationBMP bottom has large

areas of bare soil

Dense plant cover(>75%)

Plant cover,50-75%

Some plant cover,25-50%

Sparse vegetative cover(<25%),

VEG

HEALTH

TREESHealthy andestablished

Slightly stressed Stressed Dead

GROUND

COVER

Healthy andestablished


SHRUBSHealthy andestablished


EMERGENT

WETLAND

Healthy andestablished


OVERALL PERFORMANCE SCORE (circle one number)

Excellent design andfunction, no general

problems with performance

BMP is well designed, but isundersized or has a fewperformance problems

BMP is adequately designed,several problems withperformance are noted

Poor BMP design, severeperformance problems or

failure

10 9 8 7 6 5 4 3 2 1


FIELD NOTES

GOOD OR INTERESTING DESIGN FEATURES:

PHOTO #’S:

POOR OR PROBLEMATIC DESIGN FEATURES:

PHOTO #’S:

SECTION 3 – DESIGN PLAN VERIFICATIONPLAN AVAILABLE: As-built Other:

Do field observations match design plans/as-builts? Describe any differences.

Soil type in facility N/A Yes No If no, describe:

Pretreatment type and size N/A Yes No If no, describe:

Signage N/A Yes No If no, describe:

Low-flow channel N/A Yes No If no, describe:

Dimensions/volume N/A Yes No If no, describe:

Inlet type, #, and sizing N/A Yes No If no, describe:

Outlet type, #, and sizing N/A Yes No If no, describe:

Vegetation composition N/A Yes No If no, describe:

Other features N/A Yes No If no, describe:

Inspector CourseAppendix II-a | Page 1 of 2

Sample Maintenance Inspection Checklist:

Rooftop Diconnect

Inspection DateProject Site Plan/Permit NumberLocation Date BMP Placed in ServiceDate of Last Inspection InspectorOwner/Owner’s RepresentativeAs-Built Plans available: Y / N

Compensatory device type (include if the pervious area flow path is less than the required minimumlength): (NOTE: See the separate plan review checklist for the compensatory device)

Dry Well

French Drain

Rain Garden

Other: ____________________________

Element ofBMP

PotentialProblem

Pro

ble

m?

Y/

N

Inv

es

tig

ate

?Y

/N

Re

pair

ed

?Y

/N

How to Fix ProblemWho WillAddressProblem

Comments

Piping, Gutters,Drainsand Pre-TreatmentSumps

Fluid from adifferent practice isbeing piped nearpervious areas

Prevent adjacent uses frompiping through or aroundpervious area.

Professional

Sediment anddebrisaccumulation

Correct the source ofsediment and debris andremove it immediately

Owner orprofessional

Mosquitoproliferation

Correct gutter flow to eliminatestanding water; treat formosquitoes, as needed


Runoff is notentering thereceiving perviousarea

Check to see if connectionspout or overflow pipe isclogged. Remove thesediment.


The downspoutsremaindisconnected

Restore disconnectionOwner orprofessional

ManufacturedProducts

Product orcomponent isbroken or notfunctioningcorrectly.

Follow the manufacturer’smaintenancerecommendations, and repairor replace as needed.


DownstreamTreatment

The compensatorytreatment unitshave not beenmaintained

Correct identifiedd problems,according to the maintenanceguidelines for the specificsupplementary BMP.


Stormwaterdischarge isponding at point ofdisconnection

Dry wells or french drains maybe needed, if not alreadypresent. Clean out manually,and reconstruct or replacewhen no longer functioning.

Professional

Inspector CourseAppendix II-a | Page 2 of 2

Element ofBMP

PotentialProblem

Pro

ble

m?

Y/

N

Inv

es

tig

ate

?Y

/N

Re

pa

ire

d?

Y/

N


Comments

DownstreamTreatment(continued)

Erosion is evidentat the simpledisconnection,bioretention/raingardens, filterpaths, orfoundation planter

Remove the sediment anddebris build-up at the pointswhere runoff enters thepervious area. Then re-stabilize.


Practices to whichthe disconnectiondischarges are notfunctioning

Reference that practice’schecklist for instructions to fixproblems.

Professional

Practices to whichthe disconnectiondischarges aredisturbed or havebeen converted

Correct identified problemsand stabilize as needed


The receivingpervious area(s)retain dimensionsas shown on plansand are in goodcondition

Restore dimensions and makeneeded repairs


There isencroachment onthe receivingpervious area(s) oreasement bybuildings or otherstructures

Inform involved propertyowners of BMPs status ;clearly mark the boundaries ofthe receiving pervious area, asneeded

Owner orprofessional(andperhaps thelocality)

Inspector CourseAppendix II-b | Page 1 of 3


Sheet Flow to Vegetated Filter Areas and Conserved Open Space


Facility Type: Level 1 ____________________________ Level 2

Ideally, these BMP areas should be inspected annually, with the inspection conducted during the non-growing season when it is easier to observe the flow path. Once established, vegetated filter stripshave minimal maintenance needs outside of the Spring clean up: regular mowing, repair of checkdams and other measures to maintain the hydraulic efficiency of the filter strip and a dense, healthygrass cover. Grass filter strips and boundary zones must be mowed at least twice a year to preventwoody growth. A conservation easement may be required to ensure that the vegetated filter strip areaand any newly established or restored forest cover may not be cleared. Also, a responsible partyshould ensure that routine forest improvements are made over time (i.e., thinning, invasive plantremoval, etc.).

Element ofBMP

PotentialProblem

Pro

ble

m?

Y/

N

Inv

es

tig

ate

?Y

/N

Re

pa

ired

?Y

/N


Comments

ContributingDrainage Area

There is excessivetrash and debris

Remove immediately.Owner orprofessional

There is evidenceof erosino and/orbare or exposedsoil

Stabilize immediately.Owner orprofessional

Inlet

Inlets providestable conveyanceinto facility

Stabilize immediately, asneeded.


Excessive trash /debris / sedimentaccumulation at theinlet

Remove trash and debrisimmediately

Owner

Evidence oferosion at / aroundthe inlet

Correct the source problemand stabilize immediately


Channel

Scour and erosionare present withinthe vegetated filterarea

Sediments are to be cleanedout of Level Spreaderforebays and flow splitters


Debris andsediment build-upis present at thetop of thevegetated filterarea

Check conveyance(s) to thefilter area for trouble spots andcorrect any problemsimmediately. Manually removethe deposited sediment.


GravelDiaphragm

Foot or vehiculartraffic iscompromising thegravel diaphragm.

Block foot and vehiculartraffic. Re-stabilize the areaimmediately.

Professional


Element ofBMP

PotentialProblem

Pro

ble

m?

Y/

N

Inv

es

tig

ate

?Y

/N

Re

pa

ire

d?

Y/

N


Comments

Level Spreader

The level spreaderis performingproperly. Flows arenot concentratingon the down-gradient side of theelement

Search the spreader for chips,cracks, or any otherfundamental compromise ofthe structure. Repairimmediately.

Professional

There is excessivelandscape wasteand yard clippings


Vegetation

Vegetative densityis less than 90%cover in theboundary zone orgrass filter

Reseed and fertilize (ifnecessary) the exposed soil


The plantcomposition isconsistent with theapproved plans

Make a judgment regardingwhether plants need to bereplaced, and replace ifnecessary

Professional

Invasive species orweeds are present

Correctly destroy and/orremove the invasive species;make a judgment regardingwhether other weeds need tobe removed, and remove ifnecessary


There istroublesome pestinfestation

Use integrated pestmanagement (IPM)techniques to minimize theuse of pesticides andherbicides. Minimize use oforganic (not chemical)fertilizer, as needed.


There is deadvegetation and/orexposed soil

Reseed or replace deadvegetation on exposed soilareas


Overflow Area

Flows through thefilter area short-circuit the overflowcontrol section

Check that the structure is notclogged. If so, manually cleanout debris immediately.


Outlet

The outlet providesstable conveyanceaway from the filterarea


Professional

Overall

There is adequateaccess to the levelspreader and filterarea

Establish adequate accessProfessional

There is evidenceof standing water

Fill in low spots and stabilize;correct flow problems causingponding



. Remove immediatelyOwner orprofessional


Element ofBMP

PotentialProblem

Pro

ble

m?

Y/

N

Inv

es

tig

ate

?Y

/N

Re

pa

ire

d?

Y/

N


Comments

Overall(continued)

Mosquitoproliferation

Eliminate stagnant pools andestablish vegetation; treat formosquitoes as needed. Ifsprays are considered, thena mosquito larvicide, such asBacillus thurendensis orAltoside formulations can beapplied only if absolutelynecessary.


Complaints fromlocal residents

Correct real problemsOwner orprofessional

Encroachment onthe filter area oreasement bybuildings/structures

Inform involved propertyowners of BMPs status ;clearly mark the boundariesof the receiving perviousarea, as needed

Owner orprofessional(and perhapsthe locality)

Inspector CourseAppendix II-c | Page 1 of 4


Grass Channels


Type of pretreatment facility:

Sediment Forebay

Check Dam

Grass Filter Strip

Stone Diaphragm

Other: __________________________ None

Ideally, these BMP areas should be inspected annually, with the inspection conducted spring whenthe health of the grass channel lining should be evident. Once established, Grass Channels haveminimal maintenance needs outside of the spring clean up: regular mowing, repair of check dams andother measures to maintain the hydraulic efficiency of the channel and a dense, healthy grass cover.

Element ofBMP

Potential Problem

Pro

ble

m?

Y/

N

Inve

sti

ga

te?

Y/

N

Re

pair

ed

?Y

/N


Comments

ContributingDrainageArea


Remove immediatelyOwner orprofessional

There is evidence oferosion and / or bareor exposed soil

Stabilize immediatelyOwner orprofessional

Pre-treatment

There is adequateaccess to the pre-treatment facility

Establish adequate accessProfessionaland, perhaps,the locality

There is excessivetrash / debris /sediment in the facility


There is evidence oferosion and / orexposed soil


There is evidence ofdiaphragm or otherclogging

Identify and eliminate thesource of the problem; . Ifnecessary, remove and cleanor replace the stone.

Professional

There is deadvegetation andevidence of erosionand / or exposed soil

Repair erosion damage, andreseed or otherwise restabilizewith vegetation



Element ofBMP

Potential Problem

Pro

ble

m?

Y/

N

Inv

es

tig

ate

?Y

/N

Re

pa

ire

d?

Y/

N


Comments

Inlets

The inlet is notmaintaining a calmflow of water enteringthe channel or theconveyance capacityis blocked

Remove trash and sedimentaccumulated at the inflow.Sources of sediment anddebris must be identified andcorrected. Stone splash padsmust be replenished toprevent erosion.


There is evidence oferosion at / aroundinlet

Repair erosion damage, andreseed or otherwise restabilizewith vegetation.


Vegetation

Native soil is exposedor erosion channelsare forming

If sediment deposits are thickenough to damage or killvegetation, remove thesediment by hand, whileprotecting the vegetation.

Owner orProfessional

Grass height does notreach standards

Grass channels must bemowed to keep grass at aheight of 4” to 9”. Removegrass clippings after mowing.


Vegetation requiresfertilizer or pestcontrol

Fertilize according tospecifications. Use organicrather than chemical fertilizer.If feasible, use compost. Useintegrated pest management(IPM) techniques to minimizethe use of pesticides andherbicides.


The plant compositionis consistent with theapproved plans

Make a judgment regardingwhether plants need to bereplaced, and replace ifnecessary

Professional

Invasive species orweeds are present

Correctly destroy and/orremove the invasive species;make a judgment regardingwhether other weeds need tobe removed, and remove ifnecessary



Reseed or replace deadvegetation and exposed soilareas


Side Slopes

Evidence of erosionon side slopes,introducing sedimentinto the swale.

Repair erosion damageimmediately. Stabilize slopesusing appropriate erosioncontrol measures and plantappropriate vegetation.


Check Dams

Dam is not functioningproperly.

Check upstream anddownstream sides of checkdams for evidence ofundercutting, side cutting orerosion and repairimmediately.

Professional

There is a largeaccumulation ofsediment ortrash/debris behindthe check dam.

Remove sediment when theaccumulation exceeds 25% ofthe original Tv. Removetrash/debris and clearblockages of weep holes.

Professional


Element ofBMP

Potential Problem

Pro

ble

m?

Y/

N

Inv

es

tig

ate

?Y

/N

Re

pa

ire

d?

Y/

N


Comments

ChannelBottom

Undesirable plantspecies,accumulations offallen leaves, andother debris fromdeciduous plantfoliage are present.

Remove woody vegetationfrom the channel. Pruneadjacent trees and shrubs tokeep the channel clear.Remove/replace invasive veg.or weeds if they cover < 25%of the channel area. Removeaccumulated organic matterand debris immediately.


Base soils arecompacted. Thepractice does notdraw down within 48hours after a storm.

De-thatch and aerate thechannel. Remove sedimentwhen the accumulationexceeds 25% of channelvolume. Restore the originalcross section and revegetatethe channel.


There is unhealthy ordead grass cover orevidence of erosion,braiding, or excessiveponding in thechannel bottom

Fill in low spots, repairerosion, and addreinforcement planting tomaintain 90% turf cover.Reseed any salt killedvegetation and stabilizeimmediately. Keep the grassin a healthy, vigorouscondition at all times, since itis the primary erosionprotection for the channel.


ChannelOutlet

The outlet does notmaintain sheet flow ofwater exiting thechannel (unless acollection drain isused).

The source of erosion damagemust be identified andcontrolled when native soil isexposed or erosion channelsare forming. Check thechannel outlet and all roadcrossings for bank stabilityand evidence of piping orscour holes.


The outlet providesstable conveyanceout of the channel


Professional

There is excessivetrash, debris orsedimentaccumulation at outlet

Check inflow points forcogging and remove any trashand sediment deposits



Reseed or replace deadvegetation and exposed soilareas


Pest Control

There is evidence ofstanding water andmosquito habitat orrodent damage

Pest control measures mustbe taken when mosquitoesand/or rodents are found to bepresent. If sprays areconsidered, then a mosquitolarvicide, such as Bacillusthurendensis or Altosideformulations can be appliedonly if absolutely necessary.Holes in the ground located inand around the swale must befilled and stabilized withvegetation.

Professional


Element ofBMP

Potential Problem

Pro

ble

m?

Y/

N

Inv

es

tig

ate

?Y

/N

Re

pa

ire

d?

Y/

N


Comments

Overall

Access to the GrassChannel is adequate


Complaints from localresidents


Encroachment bybuildings or otherstructures

Clearly mark BMP and informthose involved of the BMPs.

Owner, pro(and perhapsthe locality)

Inspector CourseAppendix II-d| Page 1


Soil Compost Amendments


Ideally, the amended soil area should be watered once every 3 days for the first month, and thenweekly during the first growing season (April-October), depending upon rainfall. The area should beinspected at least after each storm event that exceeds 1/2-inch of rainfall during the first six monthsfollowing the incorporation of soil amendments. Depending on the results of a soil test for theamended area, a one-time spot fertilization may be needed in the fall after the first growing season toincrease plant vigor. The area should be de-thatched every few years to increase permeability.

Element ofBMP

PotentialProblem

Pro

ble

m?

Y/

N

Inv

esti

ga

te?

Y/

N

Re

pair

ed

?Y

/N


Comments



There is evidenceof erosion and / orbare or exposedsoil

Stabilize immediatelywith grass cover


Evidence ofexcessive use offertilizer or lawnchemicals

Develop and implementa nutrient and pestcontrol managementplan


Runoff is ponding,creating rills,and/or causingerosion

Dethatch or aerate thesoil. Introduce morecompost amendmentsand/or lime. Restabilizeeroded areas byreplanting vegetation.


Access to theamended soil areafor maintenance isadequate.

Establish adequateaccess

Professional

Absence of signsdesignating thearea as aConservation Area

Obtain or create andpost appropriatesignage

Owner (andperhaps thelocality)

There is evidenceof erosion and / orbare or exposedsoil


Encroachment onthe amended areaor easement bybuildings or otherstructures

Inform involved propertyowners of BMPs status ;clearly mark theboundaries of thereceiving pervious area,as needed

Owner orprofessional(andperhaps thelocality)

NOTE: Soil compost amendments do not need to be addressed in a maintenance agreement if they are incorporated toreduce lawn runoff volume or improve a residential rooftop disconnection. They probably should be addressed in a simplemaintenance agreement if the soil restoration/improvement is associated with more than 10,000 square feet of reforestation.Soil compost amendments within a vegetated filter strip or grass channel should be located in a public right of way or within adedicated stormwater or drainage easement.

Inspector CourseAppendix II-e | Page 1 of 3


Vegetated Roofs



Ideally, following construction, this practice should be inspected monthly during the vegetationestablishment period, and then every six months thereafter to assess the state of vegetativecover and to look for leaks, drainage problems and other functional or structural concerns.Maintenance may include watering, hand-weeding to remove invasive or volunteer plants, andto add plant materials to repair bare areas. The use of herbicides, insecticides, fungicides, andfertilizers should be avoided, since their presence could hasten degradation of the waterproofmembrane. Also, power-washing and other exterior maintenance operations should be avoidedso that cleaning agents and other chemicals do not harm the vegetated roof plant communities.

Element ofBMP

Potential Problem

Pro

ble

m?

Y/

N

Inv

esti

ga

te?

Y/

N

Re

pa

ire

d?

Y/

N


Comments

Vegetation

Plant cover is less90% plant cover

During establishmentperiod, replace dead plantsas needed. During thelong-term period, deadplants must generally bereplaced once per year inthe fall.


Plants are wilting

Water more frequently topromote growth andsurvival. Annual applicationof slow-release fertilizer isrecommended in the fallduring the first five yearsfollowing installation. Afterthat, fertilizer is generallynot necessary and shouldnot be applied.


Plants are choking onexcess vegetation

Fallen leaves and debrisfrom deciduous plantfoliage must be removedand should be recycled orcomposted.


Invasive and nuisanceplant species arepresent

Completely removeinvasive plant species.Weeding must be done byhand, without the use ofherbicides or pesticides.Remov weeds regularlyand do not allow them toaccumulate.



Element ofBMP

Potential Problem

Pro

ble

m?

Y/

N

Inv

es

tig

ate

?Y

/N

Re

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ire

d?

Y/

N


Comments

Vegetation(continued)

Drought conditionsare present

Mulch or shade cloth maybe applied to preventexcess solar damage andwater loss

Professional

There is troublesomepest infestation

Use integrated pestmanagement (IPM)techniques to minimize theuse of pesticides andherbicides. Minimize use oforganic (not chemical)fertilizer, as needed.




Grass has becomeunruly

Grass should be mowed asneeded. Clippings must beremoved and should berecycled or composted.


VegetationIrrigation

During theestablishment period(initial 1-3 years)

Water sufficiently to assureplant establishment, but donot exceed 1/4-inch ofwater once every 3 days


During the long-termperiod (3+ years)

Water sufficiently tomaintain plant cover, butdo not exceed 1/4-inch ofwater once every 14 days.For automatic sprinklers,use manufacturers’instructions for operationand maintenance.


StructuralComponents

Waterproofmembrane is leakingor cracked

Make necessary repairsimmediately

Professional

Root barrier isperforated

Replace swatch Professional

DrainageLayer/InletPipes

Soil substrate,vegetation, debris,litter or othermaterials clog the roofdrain inlet, scuppersor gutters

Sources of organic matter,debris, litter, and othersediment must beidentified and materialsremoved to preventclogging drainagestructures

Professional

Drain inlet pipe is inpoor condition

Repair as needed Professional

Soil Substrate/GrowingMedium

Evidence of erosionfrom wind or water

If erosion channels areevident, they must bestabilized with additionalsoil substrate/growthmedium and covered withadditional plants

Professional

Growth media hasbecome clogged withsediment

Manually remove sedimentso as not to damage plantmaterials.

Professional


Element ofBMP

Potential Problem

Pro

ble

m?

Y/

N

Inv

es

tig

ate

?Y

/N

Re

pa

ire

d?

Y/

N


Comments

Overall

Access to thevegetated roof isadequate.

Egress and ingress routesmust be restored to designstandards. Walkways mustbe clear of obstructionsand maintained to designstandards.

Professional

There is evidence ofdamage or vandalism

Maintain the vegetatedroof’s aesthetics as anasset to the property ownerand community.


Mosquitoes or otherinsects are breeding/abundant at thepractice

Standing water creating anenvironment fordevelopment of insectlarvae must be eliminatedmanually. Chemical spraysmust not be used.


Threat of a spill isimminent

Spill prevention measuresmust be exercised formechanical systemslocated on roofs whensubstances that cancontaminate stormwaterare used. Releases ofpollutants must becorrected as soon as theyare identified.


Inspector CourseAppendix II-f | Page 1 of 2


Rainwater Harvesting


Ideally, this practice should be inspected each spring and fall by the owner, with an extensiveinspection every three years by a qualified third party inspector.

Element ofBMP

PotentialProblems

Pro

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N

Inv

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?Y

/N

Re

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How to fix problemWho WillAddressProblem

Comments

Overall(Every thirdyear)

A component of thesystem is leaking ordamaged

Make necessary repairs orreplace damagedcomponents

Professional

Water is flowing out ofthe overflow pipeduring the designrainfall or smallerstorm (1-1.5 inch)

Check for clogging ordamage and ensure thepump is operating correctly.Ensure water is being usedat the volume for which thesystem was designed.


Electric system isflawed

Make any necessaryrepairs/adjustments

Professional

Sedimentaccumulation incistern exceeds 5% ofthe design volume

Remove sediment Professional

Excessiveoverhangingvegetation/treespresent

Trim branches back to meetstandards

Professional

Captured roofarea(Twice a year)

Excessdebris/sediment onthe rooftop

Remove debris immediatelyOwner orprofessional

Gutter system(Twice a year)

Gutters are cloggedand water is backedup

Unclog/remove leaves anddebris. May need to installgutter screens.


Rooftop runoff is notreaching the guttersystem

Correct the positioning orinstallation of gutters. Mayneed to replace the system


Algae growth

Do not allow sunlight topenetrate cistern. Treat thewater to remove/preventalgae


Mosquitoes arepresent in the cistern

Check screens for damageand repair/ replace. Treatwith mosquito dunks ifnecessary


Lids are damaged. Besure to check ventsand screens on inflowand outflow spigotsand mosquito screens

Repair immediately. Ensurethat lid damage has not ledto any of the aforementionedproblems with the cistern


Inspector CourseAppendix II-f | Page 2 of 2

Element ofBMP

PotentialProblems

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?Y

/N

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Comments

Screens andfilters(Twice a year)

Debris/sedimentaccumulation.Screens are clogged

Find the source of debrisand sediment and remedy.Clear the screen/filter.Replace if necessary

Professional

Pump(Twice a year)

Not operating properlyCheck for clogging. Flush ifneeded. May need to bereplaced

Professional

Pre-screeningdevices andfirst flushdevices(Every 3 months)

Dirty/clogged

Have a professional ensurescreens have not causedbacterial growth within thegutters or downspouts. Theowner may remove the cleanout plug from the first flushdevice and manually wipe itclean.


Backflowpreventer(Every thirdyear)

Pressure is unevenand is causingbackpressure or back-siphonage

Immediately stop use of theindoor water supplied by thetank and call a professional.

Professional

Secondarywater supply(Every thirdyear)

Not operating properly Consult an expert only Professional

Overflow pipe(Annually)

Erosion is evident atoverflow dischargepoint, along the filterpath/secondary runoffreduction practices

Stabilize immediately. It maybe necessary to refer toinspection checklists forother BMPs.

Professional

Overflow pipe in poorcondition

Repair or replace pipe Professional

Inspector CourseAppendix II-g | Page 1 of 2


Permeable Pavement



Ideally, each permeable pavement installation should be inspected in the Spring of each year,especially at large-scale installations.

Element ofBMP

PotentialProblems

Pro

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/N

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/N


Comments




There is evidence oferosino and/or bare orexposed soil


There is excessivelandscape waste andyard clippings


AdjacentVegetation

Trees and shrubs arewithin 5 feet of thepavement surface

Check that tree roots havenot penetrated the pavementand leaf residue has notclogged the pavement.Vegetation that limits accessor interferes with thepermeable pavementoperation must be pruned orremoved.


Inlets, Pre-Treatment Cellsand FlowDiversionStructures

There is excessivetrash, debris orsedimentaccumulation

Remove immediatelyOwner orProfessional



Evidence of cloggingClean out sediment ordebris. Remove and wash orreplace stone, as needed

Professional

Inspector CourseAppendix II-g | Page 2 of 2

Element ofBMP

PotentialProblems

Pro

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?Y

/N

Re

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?Y

/N


Comments

PavementSurface

Mosquito proliferation

Eliminate standing water andestablish vegetation; treat formosquitoes as needed. Ifsprays are considered, thenuse a licensed pestcontroller to apply anapproved mosquito larvicide(only if absolutelynecessary).


There is evidence oferosion and / or bareor exposed soil in gridpaver areas

Stabilize immediately. Mow,irrigate and apply organic(not chemical) fertilizer, asneeded to keep grasshealthy and dense enough toprovide filtering whileprotecting the underlyingsoil. Remove any grassclippings.


There is loosematerial (e.g., bark,sand, etc.) stored onthe pavement surface

Remove immediately andvacuum sweep the area toprevent clogging thepavement pores.

Professional

Pavement is stainedand/or clogged orwater is ponding,indicating thepavement is notdraining properly.Measure thedrawdown rate in theobservation well forthree (3) daysfollowing a stormevent that exceeds1/2-inch of rain. Ifstanding water is stillobserved in the wellafter three days, thisis a clear sign that thepavement is clogged.There are significantamounts of sedimenthave accumulatedbetween the pavers.

The surface must be keptclean and free of leaves,debris, and sediment byvacuum sweeping (withoutbrooms or water spray)immediately and, otherwise,at a frequency consistentwith the use and loadingsencountered (at a minimum,annual dry-weathersweeping in the Spring).Where paving blocks areinstalled, the sweeper mustbe calibrated so it does notpick up the stones betweenthe paver blocks. Followingthe vacuum sweeping, testpavement sections bypouring water from 5 gallonbuckets, to ensure properdrainage.

Professional

StructuralIntegrity

There is evidence ofsurface deteriortation,such as slumping,cracking, spalling orbroken pavers.

Repair or replace affectedareas, as necessary.

Professional

ObservationWells

Is each observationwell still capped?

Repair, as necessary. Professional

Outlet

Outlets are obstructedor erosion and soilexposure is evidentbelow the outlet.

Remove obstructions andstabilize eroded or exposedareas.


Inspector CourseAppendix II-h | Page 1 of 4

Sample VSMP Maintenance Inspection Checklist:

Infiltration



Facility Location:G SurfaceG 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) Sedimentation chamber Plunge pool Stone diaphragm Grass filter strip Grass channel Other: ___________________

Ideally, infiltration facilities should be inspected annually. Spill Prevention measures should beused around infiltration facilities when handling substances that contaminate stormwater.Releases of pollutants should be corrected as soon as identified.

Element ofBMP

Potential Problem

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N

Inv

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Comments






Vegetative cover isadequate

Supplement as neededOwner orprofessional

There are excessivelandscape waste oryard clippings

Remove immediately andrecycle or compost


Pre-TreatmentFacility



There is excessivetrash, debris, orsediment.


There is evidence oferosion and/orexposed soil



Element ofBMP

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Comments

Pre-TreatmentFacility(continued)

There is evidence ofclogging (standingwater, noticeableodors, water stains,algae or floatingaquatic vegetation)

Identify and eliminate thesource of the problem. Ifnecessary, remove andclean or replace the cloggedmaterial.

Professional

There is deadvegetation or exposedsoil in the grass filter

Restabilize and revegetateas necessary


Inlets

Inlets provide a stableconveyance intofacility



There is excessivetrash/debris/sediment.


There is evidence oferosion at or aroundthe inlet

Repair erosion damage andreseed or otherwiserestabilize with vegetation


Embankment,Flow DiversionStructures(e.g., Dikes,Berms, etc.)and SideSlopes

There is evidence oferosion or bare soil

Identify the source of erosiondamage and prevent it fromrecurring. Repair erosiondamage and reseed orotherwise restabilize withvegetation


There is excesssedimentaccumulation


Water is not detainedin the infiltration basin

Check for a breach in thecontainment structure andrepair immediately.

Professional

Side slopes supportnuisance animals.

Animal burrows must bebackfilled and compacted.Burrowing animals should behumanely removed frm area.

Professional

MaintainingFacilityCapacity andProperDrainage

Look for weedygrowth on the stonesurface indicatingsedimentaccumulation andpotential clogging

Identify and control sourcesof sediment anddebris.Remove sedimentand debris in excess of 4” indepth every 2-5 years (orsooner if performance isaffected).

Professional

Measure the draw-down rate of theobservation well forthree days following astorm event in excessof 1/2 inches in depth.If standing water isstill observed afterthree days, this is aclear sign thatclogging is a problem.

Immediately clear debrisfrom the underdrain.Replace the underdrain ifnecessary. If needed,regrade and till to restoreinfiltration capacity (the needfor this can be prevented bypreventing upstream erosionand subsequent sedimenttransport to the facility).

Professional

There is excessivetrash/debris Remove immediately


VegetationGrass within thepractice is overgrown

Grass must be mowed to aheight of 4”-9” and grassclippings removed (ideallyrecycled or composted).



Element ofBMP

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Comments


Pioneer trees aresprouting in the baseof the facility

Remove trees to preventroots from puncturing thefilter fabric, allowingsediment to enter

Vegetation forms anoverhead canopy thatmay drop leaf litter,fruit and othervegetative materialsthat may causeclogging.

Prune or remove vegetationas necessary


ObservationWell

Is each observationwell still capped?


Outlet




Evidence of flowbypassing facility

Repair immediately Professional

There is excessivetrash, debris, orsediment at the outlet


Overflow orEmergencySpillway

The pipe or spillway isnot effectivelyconveying excesswater to an adequatereceiving system

Clear sediment and debriswhenever 25% or more ofthe conveyance capacity isblocked. When damagedpipe is discovered, it must berepaired or replacedimmediately. Identify andcontrol sources of erosiondamage. Replace orreinforce stone armamentwhenever only one layer ofstone remains.

Professional


Evidence of structuraldeterioration

Repair as necessary Professional

Evidence of spallingor cracking ofstructural components

Repair or replace, asnecessary

Professional

Grates are in goodcondition



Overall

Access to theInfiltration facility or itscomponents isadequate

Establish adequate access.Remove woody vegetationand debris that may blockaccess. Ensure thatmanholes, valves and/orlocks can be opened andoperated.

Professionaland, perhaps,the locality

There is evidence ofstanding water

Fill in low spots and stabilize;correct flow problemscausing ponding



Element ofBMP

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Pro

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Inv

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/N

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Comments

Overall(continued)


Eliminate standing water andestablish vegetation; treat formosquitoes as needed. Ifsprays are considered, thena mosquito larvicide, such asBacillus thurendensis orAltoside formulations can beapplied only if absolutelynecessary.




Encroachment on theinfiltration area oreasement bybuildings or otherstructures



Inspector CourseAppendix II-i | Page 1 of 5


Bioretention Practices









ground) Sedimentation chamber Plunge pool Stone diaphragm Grass filter strip Grass channel Other: __________________

Ideally, Bioretention facilities should be inspected and cleaned up annually, preferably during the spring. During thefirst 6 months following construction of a bioretention facility, the site should be inspected at least twice after stormevents that exceed 1/2-inch of rainfall. Watering is needed once a week during the first 2 months followinginstallation, and then as needed during the first growing season (April-October), depending upon rainfall. Ifvegetation needs to be replaced, one-time spot fertilization may be needed, preferably using an organic rather thana chemical fertilizer. Each facility should have a customized routine maintenance schedule addressing issues suchas the following: grass mowing, weeding, trash removal, .mulch raking and maintenance, erosion repair,reinforcement plantings, tree and shrub pruning, and sediment removal.

Element ofBMP

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Comments


Adequate vegetation Supplement as necessaryOwner orprofessional






Remove immediately and recycleor compost


Oil, grease or otherunauthorizedsubstances areentering the facility

Identify and control the source ofthis pollution. It may be necessaryto erect fences, signs, etc


Pre-TreatmentThere is adequateaccess to the pre-treatment facility



Element ofBMP

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Pro

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Inv

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?Y

/N

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Comments

Pre-Treatment(continued)

Excessive trash,debris, or sediment.



There is evidence ofclogging (standingwater, noticeableodors, water stains,algae or floatingaquatic vegetation, oroil/grease)

Identify and eliminate the sourceof the problem. If necessary,remove and clean or replace theclogged material.

Professional




Restabilize and revegetate asnecessary


Inlets

Check for sedimentbuild-up at curb cuts,gravel diaphragms orpavement edges thatprevent flow fromgetting into the bed,and check forbypassing.

Remove sediment and correctany other problems that blockinflow.





Repair erosion damage andreseed or otherwise restabilizewith vegetation


Inflow is hindered bytrees and/or shrubs.

Remove woody vegetation frompoints of inflow and directly aboveunderdrains. (Trees and shrubsmay be located closer to theperimeter.)


Side Slopes(Annually, aftermajor storms)

There is evidence ofrill or gully erosion orbare soil

Identify the source of erosiondamage and prevent it fromrecurring. Repair erosion damageand reseed or otherwiserestabilize with vegetation


There is excesssedimentaccumulation


Side slopes supportnuisance animals.

Animal burrows must bebackfilled and compacted.Burrowing animals should behumanely removed from the area.

Professional

Vegetation(monthly)

Plant composition isconsistent with theapproved plans andany stakes or wiresare in good condition.

Determine if existing plantmaterials are at least consistentwith general Bioretention designcriteria and replace inconsistentspecies.

Professional

There should be 75-90% cover (mulchplus vegetation), andthe mulch covershould be 2-3 inchesdeep.

Supplement vegetation and mulchas needed.


Element ofBMP

Potential Problem

Pro

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m?

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N

Inv

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?Y

/N

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Comments

Vegetation(monthly)(continued)

There is evidence ofhydrocarbons or otherdeleterious materials,resulting inunsatisfactory plantgrowth or mortality,

Replace contaminated mulch. Ifproblem persists, test soils forhydrocarbons and other toxicsubstances. If excess levels arefound, the soils, plants and mulchmay all need to be replaced inaccordance with the approvedconstruction plans.

Professional

Invasive species orweeds make up atleast 10% of thefacility’s vegetation

Remove invasive species andexcessive weeds immediately andreplace vegetation as needed.


The grass is too high

Mow within a week. Grassspecies should be selected thathave dense cover, are relativelyslow growing, and require theleast mowing and chemicalinputs. Grass should be from 6-10inches high.


Vegetation isdiseased, dying ordead

Remove and replace. Increasewatering, but avoid usingchemical fertilizers, unlessabsolutely necessary.

Professional

Winter-killed or salt-killed vegetation ispresent.

Replace with hardier species.Owner orprofessional

Filter Media(Annually)

The filter media is toolow, too compacted,or the composition isinconsistent withdesign specifications

Raise the level, loosen andamend or replace the media, asneeded, to be consistent with thestate design criteria forBioretention (85-88% sand 8-12%soil fines 3-5% organic matter inform of leaf compost). Otherremediation options are describedin the maintenance section of thestate design criteria forBioretention

Professional

The mulch is olderthan 3 years or isotherwise in poorcondition

The mulch must be replacedevery 2-3 years

Professional

There is evidence thatchemicals, fertilizers,and/or oil/grease arepresent

Remove undesirable chemicalsfrom media and facilityimmediately, and replace mulchor media as needed

Professional


Remove trash and debrisimmediately. Check plant healthand, without damaging plants,manually remove the sediment,especially if the depth exceeds20% of the facility’s design depth.


There is evidence ofconcentrated flows,erosion or exposedsoil

Identify the source of erosiondamage and prevent it fromrecurring. Repair the erosiondamage and reseed or otherwiserestabilize with vegetation.

Professional


Element ofBMP

Potential Problem

Pro

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m?

Y/

N

Inv

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?Y

/N

Re

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N


Comments

Filter Media(Annually)(continued)

The filter bed isclogged and/or filledinappropriately

Redistribute the soil substrate andremove sediment within 2 weeks.

Professional

The topsoil is in poorcondition (e.g., the pHlevel is not 6-7, thecomposition isinappropriate, etc.)

Ensure a 3-inch surface depth oftopsoil consistent with the statedesign criteria for Bioretention(loamy sand or sandy loamtexture, with less than 5% claycontent, and organic mattercontent of at least 2%). If the pHis less than 6.5, spread limestone.

Professional

Underdrain/ProperDrainage

The perforated pipe isnot conveying wateras designed

Determine if the pipe is cloggedwith debris or if woody roots havepierced the pipe. Immediatelyclean out or replace the pipe, asnecessary.

Professional

The underlying soilinterface is clogged(there is evidence onthe surface of soilcrusting, standingwater, the facility doesnot dewater betweenstorms, or waterponds on the surfaceof basin for more than48 hours after anevent).

Measure the draw-down rate ofthe observation well for threedays following a storm event inexcess of 1/2 inches in depth..After three days, if there isstanding water on top but not inthe underdrain, this indicates aclogged soil layer. If standingwater is both on the surface andin the underdrain, then theunderdrain is probably clogged.This should be promptlyinvestigated and remediated torestore proper filtration. Gradingchanges may be needed orunderdrain repairs made. Thefilter media may need to be raked,excavated and cleaned orreplaced to correct the problem.Holes that are not consistent withthe design and allow water to flowdirectly through a planter to theground must be plugged.

Professional

Planters

The planter is unableto receive or detainstormwater prior toinfiltration. Waterdoes not drain fromthe reservoir within 3-4 hours of after astorm event.

Identify and correct sources ofclogging. Topsoil and sand/peatlayer may need to be amendedwith sand or replaced all together.


The planter hasstructural deficiencies,including rot, cracks,and failure, or theplanter is unable tocontain the filtermedia or vegetation

Make needed repairsimmediately.


Outlet/OverflowSpillway





Remove immediately, and keepthe contributing area free of trashand debris.



Element ofBMP

Potential Problem

Pro

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m?

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N

Inv

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?Y

/N

Re

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Comments

Outlet/OverflowSpillway(continued)

Any grates presentare in good condition

Repair or replace as necessaryOwner orprofessional

ObservationWell

Is the observation wellstill capped?


Overall


Establish adequate access.Remove woody vegetation anddebris that may block access.Ensure that hardware can beopened and operated.


There is evidence ofstanding water

Fill in low spots and stabilize;correct flow problems causingponding.



Eliminate stangant pools andestablish vegetation; treat formosquitoes as needed. If spraysare considered, then a mosquitolarvicide, such as Bacillusthurendensis or Altosideformulations can be applied only ifabsolutely necessary.




Encroachment on thebioretention area oreasement bybuildings or otherstructures

Inform involved property ownersof BMPs status ; clearly mark theboundaries of the receivingpervious area, as needed


Inspector CourseAppendix 4-j | Page 1 of 4


Dry Swales










Ideally, Dry Swales should be inspected annually in the Spring, triggering such maintenance activities assediment removal, spot revegetation, inlet stabilization, and repairs to check dams, underdrains andoutlets.

Element ofBMP

Potential Problem

Pro

ble

m?

Y/

N


Comments









Pre-Treatmentand FlowSpreaders

There is adequateaccess to the pre-treatment facility.








Professional


Element ofBMP

Potential Problem

Pro

ble

m?

Y/

N


Comments

Pre-Treatmentand FlowSpreaders(continued)


Restabilize and revegetateas necessary


The pea graveldiaphragm is at thecorrect level

Correct the installation, asneeded

Professional

Inlet and SwaleSides and Base

The inlet provides astable conveyanceinto the swale

Stabilize immediately, asneeded, and clearblockages.





Repair erosion damage andreseed


Check Dams

A check dam is notfunctioning properly.


Professional


Remove sediment when theaccumulation exceeds 25%of the original Tv. Removetrash/debris and clearblockages of weep holes.

Professional

Vegetation

Invasive species orweeds make up atleast 10% of thefacility’s vegetation

Remove invasive speciesand excessive weedsimmediately and replacevegetation as needed.


Trees form anoverhead canopy thatmay drop leaf litter,fruit and othervegetative materialsthat may causeclogging.

Prune or remove vegetationand organic litter asnecessary.


Grass height is notconsistent withstandards.

Dry Swales must be mowedto keep grass at a height of4” to 9”. Remove grassclippings after mowing.


The grass cover is notdense enough or isdead or dying

Increase watering andreseed, if necessary, tomaintain 95% turf cover, butavoid using chemicalfertilizers unless absolutelynecessary. Replace salt-killed vegetation with salt-tolerant species.

Professional

Filter Media/Soil

There is evidence thatchemicals, fertilizers,and/or oil are present

Remove undesirablechemicals from media andfacility immediately, andreplace mulch or media asneeded

Professional


Element ofBMP

Potential Problem

Pro

ble

m?

Y/

N


Comments

Filter Media/Soil (continued)


Remove trash and debrisimmediately. Check planthealth and, withoutdamaging plants, manuallyremove the sediment,especially if the depthexceeds 20% of the facility’sdesign depth.




There is evidence thatchemicals, fertilizers,and/or oil are present

Remove undesirablechemicals from mediaimmediately, and replacemulch or media as needed

Professional

Underdrain

The perforated pipe isnot conveying wateras designed

Determine if the pipe isclogged with debris or ifwoody roots have piercedthe pipe. Immediately cleanout or replace the pipe, asnecessary.

Professional

The underlying soilinterface is clogged(there is evidence onthe surface of soilcrusting, standingwater, the facility doesnot dewater betweenstorms, or waterponds on the surfaceof basin for more than48 hours after anevent).

Measure the draw-down rateof the observation well forthree days following a stormevent in excess of 1/2 inchesin depth. .After three days, ifthere is standing water ontop but not in the underdrain,this indicates a clogged soillayer. If standing water isboth on the surface and inthe underdrain, then theunderdrain is probablyclogged. This should bepromptly investigated andremediated to restore properfiltration. Grading changesmay be needed orunderdrain repairs made.

Professional

Outlet





Remove immediately, andkeep the contributing areafree of trash and debris.


Overall


Establish adequate access.Remove woody vegetationand debris that may blockaccess. Ensure thathardware can be openedand operated.



Element ofBMP

Potential Problem

Pro

ble

m?

Y/

N


Comments

Overall(continued)


Eliminate stagnant pools andestablish vegetation; treat formosquitoes as needed. Ifsprays are considered, thena mosquito larvicide, such asBacillus thurendensis orAltoside formulations can beapplied only if absolutelynecessary.



Correct real problems.Owner orprofessional

Encroachment on theswale or easement bybuildings or otherstructures



Inspector CourseAppendix II-k | Page 1 of 2


Wet Swales






Sand Bioretention Soil Peat Other:_________________




Wet Swales have maintenance needs similar to Dry Swales, although woody wetlandvegetation may need to be removed periodically.

Element ofBMP

Potential Problem

Pro

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m?

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N

Inv

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?Y

/N

Re

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Comments









Pre-Treatment









Professional

There is deadvegetation.

Replace dead vegetation asnecessary

Professional

Inspector CourseAppendix II-k | Page 2 of 2

Element ofBMP

Potential Problem

Pro

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?Y

/N

Re

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Comments

Inlets









Check Dams

A check dam is notfunctioning properly.


Professional


Remove sediment when theaccumulation exceeds 25%of the original Tv. Removetrash/debris and clearblockages of weep holes.

Professional

Vegetation(monthly)

Plant composition isconsistent with theapproved plans

Replace inconsistent species Professional

Invasive species (e.g.,phragmites) arepresent.

Remove invasive speciesimmediately and replacevegetation as needed.

Professional

Vegetation is dead ordying

Replace dead vegetation asneeded.

Professional

Outlet





Remove immediately, andkeep the contributing areafree of trash and debris.


Overall

Access to theInfiltration facility or itscomponents isadequate.




Eliminate stagnant pools iffeasible, and treat formosquitoes as needed. Ifsprays are considered, thena mosquito larvicide, such asBacillus thurendensis orAltoside formulations can beapplied only if absolutelynecessary.




Encroachment on theswale or easement bybuildings or otherstructures



Inspector CourseAppendix II-l | Page 1 of 3


Filtering Practices






Sand Bioretention Soil Peat Other:_________________




An inspection and clean-up should be scheduled annually to remove trash and floatables thataccumulate in the pre-treatment cells and filter bed. Frequent sediment cleanouts in the dry and wetsedimentation chambers are recommended every 2-3 years to maintain the function and performanceof the filter. If the filter treats runoff from a hotspot, crews may need to test the filter bed media beforedisposing of the media and trapped pollutants. If the filter does not treat runoff from a hotspot, themedia can be safely disposed by either land application or land filling, without prior testing.Warning: If the filtering facility has a watertight cover; be careful regarding the possibility offlammable gases within the facility. Care should be taken lighting a match or smoking while inspectingfacilities that are not vented. If the filtering facility is in a completely enclosed vault, the OSHAConfined Space Entry procedures must be followed.

Element ofBMP

Potential Problem

Pro

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m?

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N

Inv

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?Y

/N

Re

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Comments

ContributingDrainage Areaand SideSlopes

Adequate vegetation Supplement as necessary OwnerThere is excessivetrash and debris







Pre-Treatment



Excessive trash, Remove immediately Owner or


Element ofBMP

Potential Problem

Pro

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m?

Y/

N

Inv

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?Y

/N

Re

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Comments

debris, or sediment. professional




There is deadvegetation.

Replace dead vegetation asnecessary

Professional

Perimeter turf (or agrass filter strip) is toohigh.

Mow at least 4 times a yearto keep the grass at a heightof 4” to 9”. Remove grassclippings after mowing.


There is evidence ofoil, grease, clogging(standing water,noticeable odors,water stains, algae)


Professional

Inlets









SedimentationChambers

Sediment or debrisaccumulations areexcessive

Clean out the wet and drysedimentation chambers

Professional

Filter Media

If facility takes longerthan 48 hours to drainor filter media isdiscolored, the mediais probably clogged

Replace the top sand layerof an enclosed filter (typicallydone every 5 years). Till oraerate the surface toimprove infiltration and grasscover of an open filter (alsotypically done every 5 years.

Oil and GreaseEvidence of filtersurface clogging

Clean or replace filter media,as necessary.

Professional

UnderdrainThe underdrain is notconveying water asdesigned

To determine if the pipe isclogged, measure the draw-down rate of the observationwell for three days followinga storm event in excess of1/2 inches in depth. .Afterthree days, if there isstanding water on top but notin the underdrain, thisindicates a clogged sandlayer that must be replaced.If standing water is both onthe surface and in theunderdrain, then theunderdrain is probablyclogged. Immediately cleanout the pipe manually or, ifneeded, use a high-pressurehose. Replace theunderdrain if it is structurallydamaged.

Professional

ObservationWell(every 2 years)

Is the observation wellstill capped?



Element ofBMP

Potential Problem

Pro

ble

m?

Y/

N

Inv

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?Y

/N

Re

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d?

Y/

N


Comments

Outlet

The outlet providesstable conveyance

Remove blockages andstabilize, as needed.

Professional

Evidence of flowbypassing facility

Repair immediately Professional





Evidence of structuraldeterioration


Evidence of spallingor cracking ofstructural components


Professional

Grates are in goodcondition



Pump (whereapplicable)

Catalog cuts andwiring diagram forpump available

If missing, obtainreplacements

Owner

Waterproff conduitsfor wiring appear tobe intact


Panel box is wellmarked

If not, mark it correctly Professional

No evidence of pumpfailure (excess waterin pump well, etc.)


Overall

Access to the facilityor its components isadequate.



Condition of hydrauliccontrol components




Noticeable odorsoutside facility

Determine source andeliminate it.

Professional


Eliminate stagnant pools iffeasible, and treat formosquitoes as needed. Ifsprays are considered, thena mosquito larvicide, such asBacillus thurendensis orAltoside formulations can beapplied only if absolutelynecessary.


Encroachment on thefilter or easement bybuildings or otherstructures



Inspector CourseAppendix II-m | Page 1 of 4


Constructed Wetlands




Type of wetland Emergent Forested


ground) Vegetated buffer area Grass filter strip Grass channel

Other: __________________

During the first 6 months following construction, the wetland should be inspected twice after storm events thatexceed 1/2 inch of rainfall. Bare or eroding areas in the CDA or around the wetland buffer should be stabilizedimmediately with grass cover. Trees planted in the buffer and on wetland islands and peninsulas need to bewatered every 3 days for the first month, and then weekly during the remainder of the first growing season (April-October), depending on rainfall. Due to typical vegetation survival problems, it is typical to plan and budget for around of reinforcement planting after one or two growing seasons. Constructed wetlands should be inspectedand cleaned up annually. A wetland professional should inspect the facility every 5 years, especially to determineif there is any significant negative change in the wetland species composition from the design or an otherwisehealthy wetland.

Element ofBMP

Potential Problem

Pro

ble

m?

Y/

N

Inv

es

tig

ate

?Y

/N

Re

pa

ire

d?

Y/

N


Comments


Adequate vegetation Supplement as needed OwnerThere is excessivetrash and debris


There is evidence oferosion and/or bare orexposed soil


There are excessivelandscape waste andyard clippings



Pre-Treatment





There is evidence oferosion and/orexposed soil.

Immediately identify andcorrect the cause of theerosion and stabilize theeroded or bare area.


Sediment depositsare 50% or more offorebay capacity.

Dredge the sediment torestore the design capacity;sediment should be dredgedfrom forebays at least every

Professional

Inspector CourseAppendix 4-M | Page 2 of 4

Element ofBMP

Potential Problem

Pro

ble

m?

Y/

N

Inv

es

tig

ate

?Y

/N

Re

pa

ire

d?

Y/

N


Comments

5 years.


The sediment markeris not vertical.

Adjust the sediment depthmarker to a verticalalignment

Professional

There is deadvegetation

Revegetate, as neededOwner orprofessional

Inlets

The inlet provides astable conveyance.

Stabilize immediately, asneeded; clear blockages.




There is evidence oferosion/undercuttingat or around the inlet



There is cracking,bulging, erosion orsloughing of theforebay dam.

Repair and restabilizeimmediately.

Professional

There is woodygrowth on the forebaydam.

Remove within 2 weeks ofdiscovery.

Professional

There is evidence ofnuisance animals.

Animal burrows must bebackfilled and compacted.Burrowing animals should behumanely removed fromarea

Professional

Vegetation(trees, shrubs,aquatic plants)


Determine if existing plantmaterials are at leastconsistent with the generalConstructed Wetland designcriteria, and replaceinconsistent species.

Professional

Invasive species arepresent.

Remove invasive speciesimmediately and replacevegetation as needed. As ageneral rule, control ofundesirable invasive species(e.g., cattail and Phragmites)should commence whentheir coverage exceeds morethan 15% of a wetland cellarea. Although theapplication of herbicides isnot recommended, sometypes, such as Glyphosate,have been used to controlcattails with some success.Extended periods ofdewatering may also work,since early manual removalprovides only short-termrelief from invasive species.

Professional

Vegetation is dead orreinforcement plantingis needed.

Remove and replace dead ordying vegetation.

Professional

Trees planted in thebuffer and on wetlandislands andpeninsulas needwatering during thefirst growing season

Consider watering every 3days for first month, andthen weekly during first year(April – October), dependingon rainfall.



Element ofBMP

Potential Problem

Pro

ble

m?

Y/

N

Inv

es

tig

ate

?Y

/N

Re

pa

ire

d?

Y/

N


Comments

Vegetation(trees, shrubs,aquatic plants)(continued)

Practice has becomeovergrown and is notdeveloping into amature wetland.

Harvest vegetationperiodically if the wetlandbecomes overgrown or toguide maturing of forestedwetlands (typically 5 and 10years after constr.).


Wetland Cellsand Pools

Sedimentaccumulation is 50%or more of capacity.

Dredge the sediment torestore the design capacity

Professional

There is evidence offloating debris, sparsevegetative cover,erosion or slumping ofside slopes.

Remove debris. Repair andstabilize.


Open water isbecoming overgrown.

Harvest the unwantedvegetation.

Professional


Animal burrows must bebackfilled and compacted.Burrowing animals should behumanely removed from thearea.

Riser/PrincipleSpillway andLow-FlowOrifice(s)

There is adequateaccess to riser formaintenance.


Pieces of the riser aredeteriorating,misaligned, broken ormissing.

Repair immediately. Professional

Adjustable controlvalves are accessibleand operational.

Repair, as needed. Professional

Reverse-slope pipesand flashboard risersare in good condition.


There is excessivetrash, debris, or otherobstructions in thetrash rack.


Seepage into conduit Seal the conduit Professional

Berm/Dam/Embankmentand Abutments

There is sparse veg.cover, settlement,cracking, bulging,misalignment, erosionrills deeper than 2inches, or sloughingof the dam.


Professional

There are soft spots,boggy areas, seepageor sinkholes present.

Reinforce, fill and stabilizeimmediately.

Professional


Animal burrows must bebackfilled and compacted.Burrowing animals should behumanely removed fromarea.

Professional

There is woodyvegetation on theembankment.

Removal of woody speciesnear or on the embankmentand maintenance accessareas should be done whendiscovered, but at leastevery 2 years.

Emergency There is woody Removal of woody species Owner or


Element ofBMP

Potential Problem

Pro

ble

m?

Y/

N

Inv

es

tig

ate

?Y

/N

Re

pa

ire

d?

Y/

N


Comments

Spillway growth on thespillway.

near or on the emergencyspillway should be donewhen discovered, but atleast every 2 years.

professional

There is excessivetrash, debris, or otherobstructions.


There is evidence oferosion/back-cutting



There are soft spots,seepage or sinkholes.



Outlet

The outlet providesstable conveyancefrom the wetland.

Stabilize as needed. Professional

There are excessivesediment deposits.

Remove sediment. Professional

Released water iscausing undercutting,erosion or displacedrip-rap at or aroundthe outlet

Repair, reinforce or replacerip rap as needed, andrestabilize.

Professional

Woody growth within5 feet of the outletpipe barrel.

Prune vegetation back toleave a clear discharge area.




Overall




Water levels in one ormore cells areabnormally high orlow.

Clear blockages of the riseror orifice(s) and make otheradjustments needed to meetthe approved designspecifications.

Professional




Eliminate stagnant pools iffeasible, and treat formosquitoes as needed. Ifsprays are considered, thena mosquito larvicide, such asBacillus thurendensis orAltoside formulations can beapplied only if absolutelynecessary. Can also stockthe basin with mosquito fishto provide natural mosquito& midge control.


Encroachment on thewetland or easementby buildings or otherstructures



Overall(continued)

Safety signage is notadequate.

Provide sufficient, legiblesafety signage.


Inspector CourseAppendix II-n| Page 1 of 5

Sample aintenance Inspection Checklist:

Wet Ponds



Pond characteristics and functions(check all that apply)

Water quality treatment Extended detention included Channel protection Ties into groundwater Single cell pond Multiple-cell pond system Pond with one or more wetland cells



ground) Vegetated buffer area Grass filter strip Grass channel Other: ___________________

During the first 6 months following construction, the pond should be inspected twice after storm events thatexceed 1/2 inch of rainfall. The aquatic benches shuld be planted with emergent wetland species, consistent withthe Wet Pond design specifications. Bare or eroding areas in the CDA or around the pond buffer should bestabilized immediately with grass cover. Trees planted in the buffer need to be watered every 3 days for the firstmonth, and then weekly during the remainder of the first growing season (April-October), depending on rainfall.Due to typical vegetation survival problems, it is typical to plan and budget for a round of reinforcement plantingduring the second growing season after construction. Wet Ponds should be inspected and cleaned up annually.

Element ofBMP

Potential Problem

Pro

ble

m?

Y/

N

Inv

es

tig

ate

?Y

/N

Re

pa

ire

d?

Y/

N


Comments


Adequate vegetation Supplement as needed OwnerThere is excessivetrash and debris


There is evidence oferosion and/or bare orexposed soil


There are excessivelandscape waste andyard clippings



Pre-Treatment





Inspector CourseAppendix 4-N | Page 2 of 5

Element ofBMP

Potential Problem

Pro

ble

m?

Y/

N

Inv

es

tig

ate

?Y

/N

Re

pa

ire

d?

Y/

N


Comments






Dredge the sediment torestore the design capacity;sediment should be dredgedfrom forebays at least every5-7 years, and earlier ifperformance is beingaffected.

Professional



Professional

There is evidence ofclogging

Clear blockages of the riseror orifice(s) and make otheradjustments needed to meetthe approved designspecifications

Professional

Inlet

The inlet provides astable conveyanceinto the pond






Repair erosion damage andrestabilize




Professional



Professional



Professional

There is more than 1inch of settlement.

Add fill material and compactthe soil to the design grade


The inlet alignment isincorrect.

Correct immediately.Owner orProfessional

Vegetation


Determine if existing plantmaterials are consistent withthe general Wet Pond designcriteria, and replaceinconsistent species.

Professional



Professional




Grass around thefacility is overgrown

Mow (at least twice a year)to a height of 4”-9” high andremove grass clippings



Element ofBMP

Potential Problem

Pro

ble

m?

Y/

N

Inv

es

tig

ate

?Y

/N

Re

pa

ire

d?

Y/

N


Comments




Professional

Permanent Pooland SideSlopes

There is excessivetrash and/or debris.


There is evidence ofsparse vegetativecover, erosion orslumping side slopes.

Repair and stabilize physicaldamage, and reseed or plantadditional vegetation.



Animal burrows must bebackfilled and compacted.Remove burrowing animalshumanely from the area.

There is significantsedimentaccumulation.

Conduct a bathymetric studyto determine the impact todesign volumes, and dredgeif necessary.

Professional


There is adequateaccess to the riser formaintenance.









Clear blockages of the riseror orifice(s) and make otheradjustments needed to meetthe approved design specs.

Professional

Seepage into conduit Seal the conduit ProfessionalThere is excessivetrash, debris, or otherobstructions in thetrash rack.


Dam/Embankmentand Abutments

There is sparse veg.cover, settlement,cracking, bulging,misalignment, erosionrills deeper than 2inches, or sloughingof the dam.

Repair and restabilizeimmediately, especially aftermajor storms.

Professional

There are soft spots,seepage, boggy areasor sinkholes present.







Element ofBMP

Potential Problem

Pro

ble

m?

Y/

N

Inv

es

tig

ate

?Y

/N

Re

pa

ire

d?

Y/

N


Comments

Overflow/EmergencySpillway

There is woodygrowth on thespillway.

Removal of woody speciesnear or on the emergencyspillway should be donewhen discovered, but atleast every 2 years.




There is evidence oferosion/back cutting






Only one layer ofstone armoring existsabove the native soil.

Reinforce rip-rap or otherarmoring materials.

Professional

Outlet

The outlet provides astable conveyancefrom the pond.



There is woodygrowth within 5 feet ofthe outlet pipe barrel.





There are excessivesediment deposits atthe outlet.


Discharge is causingundercutting, erosionor displaced rip-rap ator around the outlet.


Professional

Overall




Fences areinadequate

Collapsed fences must berestored to an uprightposition. Jagged edges anddamaged fences must berepaired or replaced.

Professional



Professional




Eliminate stagnant pools andstock the basin withmosquito fish to providenatural mosquito & midgecontrol. Treat for mosquitoesas needed. If spraying, thenuse mosquito larvicide, (e.g.,Bacillus thurendensis orAltoside formulations) only ifabsolutely necessary.



Element ofBMP

Potential Problem

Pro

ble

m?

Y/

N

Inv

es

tig

ate

?Y

/N

Re

pa

ire

d?

Y/

N


Comments

Overall(continued)

Encroachment on thepond or easement bybuildings or otherstructures






Inspector CourseAppendix II-o | Page 1 of 5


Extended Detention Ponds



Pond characteristics and functions(check all that apply)

Water quality treatment Extended detention included Channel protection Ties into groundwater Single cell pond Multiple-cell pond system Pond with one or more wetland cells



ground) Vegetated buffer area Grass filter strip Grass channel Other: ___________________

Ideally, Extended Detention Ponds should be inspected annually. ED Ponds are prone to a highclogging risk at the ED low-flow orifice. Ideally, the orifice should be inspected at least twice a yearafter initial construction. The constantly changing water levels in ED Ponds make it difficult to mow ormanage vegetative growth. The bottom of ED Ponds often become soggy, and water-loving tees suchas willows may invade and will need to be managed. Periodic mowing of the stormwater buffer is onlyrequired along maintenance rights-of-way and the embankment. The remaining buffer may bemanaged as a meadow (mowing every other year) or forest. Frequent removal of sediment from theforebay (every 5-7 years, or when 50% of the forebay capacity is filled) is essential to maintain thefunction and performance of the ED Pond. Sediments excavated from ED Ponds are usually notconsidered toxic or hazardous, so they can be safely disposed of either by land application of landfilling.

Element ofBMP

Potential Problem

Pro

ble

m?

Y/

N

Inv

es

tig

ate

?Y

/N

Re

pa

ire

d?

Y/

N


Comments


Adequate vegetation Supplement as needed. OwnerThere is excessivetrash and debris


There is evidence oferosino and/or bare orexposed soil


There is excessivelandscape waste andyard clippings


Inspector CourseAppendix 4-O | Page 2 of 5

Element ofBMP

Potential Problem

Pro

ble

m?

Y/

N

Inv

es

tig

ate

?Y

/N

Re

pa

ire

d?

Y/

N


Comments

Pre-Treatment









Dredge the sediment torestore the design capacity;sediment should be dredgedfrom forebays at least every5-7 years, and earlier, asneeded.

Professional



Professional


Clear blockages of the riseror orifice(s) and make otheradjustments needed to meetthe approved designspecifications

Professional

There is deadvegetation

Revegetate, as neededOwner orprofessional

Inlet

The inlet provides astable conveyanceinto the pond






Repair erosion damage andrestabilize




Professional



Professional



Professional

There is more than 1inch of settlement.

Add fill material and compactthe soil to the design grade


The inlet alignment isincorrect.

Correct immediately.Owner orProfessional

Vegetation


Determine if existing plantmaterials are consistent withthe general Wet Pond designcriteria, and replaceinconsistent species.

Professional



Professional


Element ofBMP

Potential Problem

Pro

ble

m?

Y/

N

Inv

es

tig

ate

?Y

/N

Re

pa

ire

d?

Y/

N


Comments





Grass around thefacility is overgrown

Mow (at least twice a year)to a height of 4”-9” high andremove grass clippings.




Professional

Permanent Pooland SideSlopes

There is excessivetrash and/or debris.


There is evidence ofsparse vegetativecover, erosion orslumping side slopes.

Repair and stabilize physicaldamage, and reseed or plantadditional vegetation.





There is significantsedimentaccumulation.

Conduct a bathymetric studyto determine the impact todesign volumes, and dredgeif necessary.

Professional


There is adequateaccess to the riser formaintenance.








Seepage into conduit Seal conduit Professional


Clear blockages of the riseror orifice(s) and make otheradjustments needed to meetthe approved design specs.

Professional

There is excessivetrash, debris, or otherobstructions in thetrash rack.


Dam/Embankmentand Abutments

There is sparse veg.cover, settlement,cracking, bulging,misalignment, erosionrills deeper than 2inches, or sloughing.

Repair and restabilizeimmediately, especially aftermajor storms.

Professional

There are soft spots,seepage, boggy areasor sinkholes.



Element ofBMP

Potential Problem

Pro

ble

m?

Y/

N

Inv

es

tig

ate

?Y

/N

Re

pa

ire

d?

Y/

N


Comments

Dam/Embankmentand Abutments(continued)





Overflow/Emergency Spillway

There is woodygrowth on thespillway.

Removal of woody speciesnear or on the emergencyspillway should be donewhen discovered, but atleast every 2 years.




There is evidence oferosion/back cutting






Only one layer ofstone armoring existsabove the native soil.

Reinforce rip-rap or otherarmoring materials.

Professional

Outlet

The outlet provides astable conveyancefrom the pond.



There is woodygrowth within 5 feet ofthe outlet pipe barrel.





There are excessivesediment deposits atthe outlet.


Discharge is causingundercutting, erosionor displaced rip-rap ator around the outlet.


Professional

Overall




Fences areinadequate

Collapsed fences must berestored to an uprightposition. Jagged edges anddamaged fences must berepaired or replaced.

Professional



Professional




Element ofBMP

Potential Problem

Pro

ble

m?

Y/

N

Inv

es

tig

ate

?Y

/N

Re

pa

ire

d?

Y/

N


Comments

Overall(continued)


Eliminate stagnant pools andstock the basin withmosquito fish to providenatural mosquito & midgecontrol. Treat for mosquitoesas needed. If spraying, thenuse mosquito larvicide, (e.g.,Bacillus thurendensis orAltoside formulations) only ifabsolutely necessary.


Encroachment on thepond or easement bybuildings or otherstructures






Appendix II Sample VSMP Stormwater Management Facility ... · Generic Maintenance Inspection...

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Transcript of Appendix II Sample VSMP Stormwater Management Facility ... · Generic Maintenance Inspection...