Operations and Maintenance Plan Carver county Courthouse Porous Paving + Biofiltration

Legal Description: Lot 1, Block 1, and Outlot A. COURTHOUSE CAMPUS TWO. PID# 301490010

Contact: Kevin Maas (952) - 361-1557 600 E 4th St Chaska, MN 55318

Project Description/: This project was installed during the fall of 2008 as a demonstration site for the Purpose use of porous paving and planted filtration trench within Carver County.

The project serves to treat the stormwater prior to entering into the adjacent East Chaska Creek. The approximate drainage area is ~ 37,000 sq ft. Maintenance is necessary to the functionality and long-term success of the project. Features include:

Porous bituminous pavement w/ underdrain Planted Biofiltration w/ underdrain

All underdrains are connected to adjacent catch basin w/ manhole. Inspections of the connection into the catch basin will indicate that the underdrain is functioning.

Maintenance Tasks – Courthouse Porous Paving + Biofiltration

Timeline Task Personnel

February Schedule porous pavement sweeper for April, July and October

Facilities Dept. Manager

April Remove dead plant material (if not completed in the fall)Sweep porous pavement with a regenerative air vacuum sweeperReplace and dead plants w/ new plugs or transplants

Facilities Dept. StaffContracted Services & Facilities Dept. Manager

May Add mulch swale as neededMow grass buffer around swale

Facilities Dept. StaffContracted Services & Facilities Dept. Manager

June Mow grass buffer around swaleWeed swale

Contracted Services & Facilities Dept. ManagerFacilities Dept. Staff (Planning & Water Mngt staff are available to assist with plant identification)

July Weed swale Mow grass buffer around swaleSweep porous pavement with a regenerative air vacuum sweeper

Facilities Dept. Staff (PWM staff available to assist)Contracted Services & Facilities Dept. ManagerContracted Services & Facilities Dept. Manager

August Mow grass buffer around swaleWeed swale

Contracted Services & Facilities Dept. ManagerFacilities Dept. Staff (PWM staff are available to assist with plant identification)

September Mow grass buffer around swale Contracted Services & Facilities Dept. Manager

October Mowing & fixing any erosion/gullying formed during season

Facilities Dept. Staff

EarlyNovember

Remove dead plant material (could also wait until spring)Sweep porous pavement with a regenerative air vacuum sweeper

Facilities Dept. StaffContracted Services & Facilities Dept. Manager

Additional No sand (de-icing) is to be used at any time on or around the porous pavement. Salt use for de-icing should follow the guidelines laid out by the Minnesota Pollution Control Agency.

Dg anyg anDss buffer around ss buffer aroundDMow grass buffer around swaleMow grass buffer around swaleDraft demonstr

h within Carver hin Cior to entering into the aor to entering into the

nage area is ~ 37,000 sq ft.age area is ~ 37,000 sq ft. onality and longnality an -term success of the erm succe

ment w/ underdrainrdrainw/ underdrain

onnected to adjacent catch basin w/ manhole. Inspections tch basin w/ manhole. Inspections into the catch basin will indicate that the underdrain is in will indicate that the unde

ks – Courthouse Porous Paving + BiofiltrationPorous Paving + Biofiltr

Task Personnelafafafrafs pavement sweeper for April, July and er for April, July a Facilities Dept. ManagerFacilities Dept. Managerarararadead plant material (if not completed in the fall)(if not completed in the fall)p porous pavement with a regenerative air with a rege

uum sweeperReplace and dead plants w/ new plugs or transplantsace and dead plants w/ new plugs

Facilities Dept. Sts Dept.Contracted Seracted SerarararaAdd mulch swale as neededAdd mulch swale as nee

Mow grass buffer around swaleMow grass buffer around swFaciC

DrararaDraMow grass buffer around swaleund swaleWeed swaleDDDrrrDrWeed swale Mow grass buffer around swaleeSweep porous pavement with a regenerativeSweep porous pavement with a regevacuum sweepervacu DDDDWeedWeed swale swaleDDD

Chaska GovernmentCenter

Chaska, MNLocation Map

Site aerial

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INFILTRATION BASIN PLANTINGS Common Name Scientific Name QTY.AN New England Aster Aster novae-angliae 74IV Blue Flag Iris Iris versicolor 76LP Prairie Blazingstar Liatris pychnostachya 28RF Black Eyed Susan Rudbeckia hirta 25

LANDSCAPE PLAN1L1.1

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Biofiltration (Rain Garden) Maintenance Inspection Checklist Inspector:

Date:

Time:

Weather: Rainfall over previous 2-3 days?

Reading from closest NOAA reporting station:_______”Rain Garden Location:

Mark items in the table below using the following key:

X Needs immediate attention– Not Applicable

Okay? Clarification Required.

Rain Garden Components:Items Inspected Checked Maintenance

NeededInspection Frequency

DEBRIS CLEANOUT Y N Y N M1. Rain gardens and contributing areas clean of debris

2. No dumping of yard wastes into rain garden

3. Litter (trash, debris, etc.) have been removed

VEGETATION M4. No evidence of erosion

5. Is plant composition still according to approved plans

6. No placement of inappropriate plants

DEWATERING AND SEDIMENTATION A,AMS7. Rain garden dewaters between storms

8. No evidence of standing water

9. No evidence of surface clogging

10. Sediments should not be greater than 20% of swaledesign depth

OUTLETS/OVERFLOW SPILLWAY A, AMS11. Good condition, no need for repair

12. No evidence of erosion

13. No evidence of any blockages

INTEGRITY OF BIOFILTER M14. Raingarden has not been blocked or filled

inappropriately15. Mulch layer is still in place (depth of at least 3”)16. Noxious plants or weeds removed

Inspection Frequency Key A= Annual, M= Monthly, AMS= After Major Storm

Draft tftCheckCheckeedd Maintenancece

NeededInspIn ection FrFreeququencyaaafafaftaftaftaafaftY NN YY N MMaaafafafafafafafafafaafafafafuting areas clean of debribriss aaafafafafafafafafafaafafafafwastes into rain garden aaafafafafafafafafafrarafafafafis, etc.) have been reremmovedove rararararaaaaaaararaaaarararararaaaaararaaance of erosion rararararaaaaararaaaant composition still according to apording to apprp oved plans

DrararararaaararaaNo placeNo placemment of ent of ininaappaa propriateprop plantntss

DrararararararaDEWATEWATEERRIING AND SESEDDIMENIMENTTATIA ON

Drrrrrrr77.. RainRa garden dewaters betwebetweeenn ssttoro ms

DrrrDr88. No evidence of standing wateraterDDrrrDr99.. No evidence of surface clogginggDDD1100.. SeSeddiments should not be greater tthhanan 220% of swdesdesigign depn thDDDLETS/OVERFLETS/OVE LOW SPILLWAYWAYDoodood ccoonndditioiti n, no need foof r rer reppairairDddenceence of erosionof erosionDof anyof any bloblocckagkaDFILTFILTD

Comments:

OVERALL CONDITION OF FACILITY:

In accordance with approved design plans? Y / N In accordance with As Built plans? Y / N

Dimension on as built:

Field Verified Dimension:

Maintenance required as detailed above? Y / N Compliance with other consent conditions? Y / N

Comments:___________________________________________________________________________

_____________________________________________________________________________________

Dates by which maintenance must be completed: ______/___/_____

Dates by which outstanding information as per consent conditions is required by: :_____/___ /_____

Inspector’s signature:___________________________________________________________________

Consent Holder/Engineer/Agent’s signature:_________________________________________________

Consent Holder/Engineer/Agent’s name printed:_____________________________________________

Draft tttftftftfttftttftttftttaftttaftttafafOF FACILITY:

proved design plans? Y / N In accordance with As Built plans? ans? Y / N In accordance with As Built plans?

built:

ied Dimension:

tenance required as detailed above? Y / N Compliance with other enance required as detailed above? Y / N Co

ComComments:____________________________________________________________

____________________________________________________________________________

ates by which maintenance must be completedates by which maintenance must be comp

y which outstanding information asy which outstanding information

ure:________ure:________

Porous Paving Maintenance Inspection Checklist

Inspector:

Date:

Time:

Weather: Rainfall over previous 2-3 days?

Site Conditions:

Mark items in the table below using the following key:

X Needs immediate attention– Not Applicable

Okay? Clarification Required.

Porous Paving Components:Items Inspected Checked Maintenanc

e Needed

Inspection Frequency

PAVEMENT SURFACE Y N Y N M1. Signs of clogging (e.g. standing water)?2. Debris accumulation (mulch, sticks, trash)?3. Sediment accumulation?4. Standing water present?

ADJACENT AREAS A, AMS

5. Erosion from underdrain outlet?6. Exposed soil in areas discharging to porous

paving?7. Is porous pavement adversely affected by any

adjacent site feature?DEWATERING A, AMS

8. Does runoff discharge from pavement area within 48hrs?

OUTLETS/OVERFLOW A, AMS

9. Is outlet for storm sewer system free from debris and in good working order?

OTHER

10. Have there been complaints? A11. Public Hazard noted?12. Other:

Inspection Frequency Key A= Annual, M= Monthly, AMS= After Major Storm

Dd noted?d noted?Draft ftCheckedChecked Maintenancnc

e e NeededNeed

Inspection InsFrequenFrequafafaftaftaftaftaftafaftaftY NN YY Nafafafafafafafafafafafafafafafaf(e.g. standing water)?er) afafafafafafafafafafafrafafafafaflation (mulch, sticks, trash)?cks, tras rararaaaaaaaaaraaaaacumulation? rararaaaaaaaraaaag water present? rararaaaaaaaraaaaT AREAS

Drararaaaaaaraaarosion from underdrain outlet?sion from underdrain outlet?

Drararaaaaaraaa Exposed soil Exposed soil in areas discharging to porous in areas discharging to poroupaving?paving?

Drararaaaraa7. Is porous pavement adversely affected by any 7. Is porous pavement adversely affected by any adjacent site feature?DrrrDrDEWATERING DE DDrD8. Does runoff discharge from pavement area with8. Does runoff discharge from pavem48hrs?48 DDDOUTLETS/OVERFLOW OUTLET D Is o Is outlet for storm sewer system freeutlet for storm sewer system fnd in good working order?nd in good working order?DDe been complaine been complaDDD

Comments:

OVERALL CONDITION OF FACILITY:

In accordance with approved design plans? Y / N

In accordance with As-Built plans? Y / N

Dimension on as built: Y / N

Field Verified Dimension: Y / N

Maintenance required as detailed above? Y / N

Compliance with other consent conditions? Y / N

Comments:____________________________________________________________________________________

_____________________________________________________________________________________________

Dates by which maintenance must be completed: ______/___/_____

Dates by which outstanding information as per consent conditions is required by: :_____/___ /_____

Inspector’s signature:___________________________________________________________________

Consent Holder/Engineer/Agent’s signature:_________________________________________________

Consent Holder/Engineer/Agent’s name printed:______________________________________________

Draft tttftftftftfttftttftttftttafttafttLITY:

gn plans? Y / N / N

t plans? Y / N/ N

Y / N

imension: Y / N

ce required as detailed above? required as detailed above? Y / N

mpliance with other consent conditions? pliance with other consent condi Y / NY

Comments:___________________________________________Comments:__________________________________________

____________________________________________________________________________________

y which maintenance must be completey which maintenance must be comple

h outstanding information ah outstanding information