Permeable pavement weed control

Transcription

1 Permeable pavement weed control Systemic herbicides like Roundup - Preferred Flame weed killers LP gas fueled Be careful. Could ignite Concrete! Steam them?

2 Grassed Permeable Pavement You might have to mow it!

3 Permeable pavement weed control dos and don ts Don t pull large weeds can pull up pavers and fill gravel Do control weeds when they are small if killed when large, dead weed biomass can clog pavement Some permeable pavements are meant to be vegetated be careful

4 Permeable Pavement Problems: Oil and Grease Emulsify with Biodegradable Detergent?

5 Add Stain Remover

6 Let it soak, then pressure wash

7 Snow Concerns (Yes, it snows in NC sometimes)

8 Snow Concerns No Sediment (sand) disposal Be careful with snow plow blade height!

9 Where to Stockpile Require Street Sweeper visit within a few weeks of snow fall Parking lots with permeable pavement store Perm Pave Bad Good

10 Scarred Pervious Asphalt Snow Plow Damage

11 Permeable Pavement Maintenance Tasks and Schedule TASK Inspect Lot for Clogging SCHEDULE Semi-annual to Quarterly Street sweeping and vacuuming Gravel replacement Oil and grease cleaning Avoidance of landscape debris (grass clippings, leaves) Spray/ Flame Weeds and Moss with Herbicides Adjoining land and watershed stabilization Per inspection results Post-Vacuuming As needed per clientele Each landscape maintenance Monthly during growing season Keep watch

12 Sand Filter

13 Why A Sand Filter? Commonly used in ultra urban environments expensive land, built-out watersheds Can drive on some of them Very effective at filtering TSS and oil and grease

14 Sand filter limitations Expensive to build and maintain Easily clogged

15 How Sand Filters Work:

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17 Accessing Chambers maybe Strenuous

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19 Don t Let Smutzdecke ruin the infiltration rate Break up crusty layer on top of Sand once per year, on average Garden Rake works Do not need to take away Good bugs in smutzdecke

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22 Disposal Options Take to Landfill Sedimentation Chamber + Top of Sand Chamber Research may mandate other options in future Once every 3 yr?

23 Re-filling Sand in Chamber What do the plans say? If plans unavailable, dig down 8 and retrieve a clean sample

24 You can pay me now or pay me later

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26 Courtesy: BMP West

27 Courtesy: BMP West

28 Sand Filter Maintenance Tasks and Schedule TASK Street sweep parking lot Clean trash Skim sand media Pump oil & grit from sedimentation chamber Replace sand media SCHEDULE Quarterly As needed Annual Annual to tri-annual When clogged expect 3 years

29 Proprietary Devices Examples: BaySaver CDS Technologies Stormceptor Stormfilter Vortechs And many more

30 Why A Proprietary Device? Usually sited in urban environments where there is no room for a biological BMP Almost all are located underground can drive or build over them

31 Proprietary Devices

32 Special Inlet Devices Trash Guard

33 Parking Lot BMP? Lock Lid for Safety

34 Task Committee: ASCE In 2008, NC State hosted a Manufactured Practice Maintenance Task Force Group included Academia, Consulting, Government, and Vendors The Group **by consensus** agreed to certain maintenance elements.

35 How Proprietary Devices Work: By way of filtration, settling, and other separation techniques: Separate oil and grease Retain grit and trash Remove suspended solids and associated pollutants Every system is unique

36 Some Common Agreed Upon Elements of Maintenance

37 Accessing the insides Manhole: 30 min 36 pref.

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39 Confined Space Certification

40 Gas Detection Meters a MUST CanarySense.com Roanoke Co., VA

41 Ventillation

42 Occasionally, Extra Precaution Level B Suit

43 Tight Squeeze? Roanoke Co., VA

44 Inspect Trench Drains serving BMP

45 Clean Out Inlet Pipes, too

46 Pressure Wash the Insides

47 Considerations: Outfall Drain Plug (keep dirty h2o in BMP)

48 Proprietary Device: Dirty Slurry How do you get rid of this? Where does this go?

49 Vac-Truck

50 Inspect & Replace Filters

51 Filtration Device Maintenance Images courtesy of Lowe s

52 Remove Old Filters Images courtesy of Lowe s Old filters unscrew from threaded base in vault Using Vac-Truck and rope, remove each filer from the vault Units can weigh up to 250 pounds each.

53 Prepping Old Filters Removing Filter Media Using Vac-Truck, remove the filter media and sediment Reassemble the empty filter for return shipment Images courtesy of Lowe s

54 Give me Accessibility or Give me Death

55 Accessibility Issues Within 5m of Vac Truck

56 Cleaning out Inlet - VacTruck

57 Easy Access: Raleigh, NC

58 Proprietary Device Maintenance Consult manufacture of product for exact maintenance recommendations Common ASCE Maintenance Elements: Accessing the Insides (includes Safety) Powerwashing Pumping sediment, grit Replacing filters