Page 12 - Section4.2.1-SWPPPCutSheet-FiltrexxStormWaterBlanket

374 | Filtrexx ® Low Impact Design Manual | Version 8.0

protection, not under/in front of the system.

8. Channel protection will be fabricated on-site or prefabricated and delivered to site for installation.

9. Channel protection will be fabricated using a Filtrexx ® Channel protection Molding Cone tm , to ensure 3 in (75mm) highby 12 in (300mm)wide Channel protection construction is met.

10. Channel protection shall be placed parallel to water fow, where socks are tightly abutted toprevent water seepage between andunderneath the Channel protection.

11. Channel protection shall be lightly compacted and abutting edges leveled to tighten seal between socks and encourage even water fow over Channel protection system.

12. Channel protection shall not be installed on channel bed slopes greater than 10%.

13. Channel protection shall not be installed on channel banks greater than 2:1, and banks 3:1 if mowing will be conducted to manage vegetation.

14. Stakes shall be installed through the middle of the Channel protection on 10 ft (3m) centers, using 2 in (50mm) by 2 in (50mm) by 3 ft (1m) wooden stakes. Top of stakes should be cut off, leaving 3 in (75mm) above the top of the Channel protection; or

15. L-shaped rebar may be installed through middle of Channel protection on 10 ft (3m) centers, where “L” shall be bent to hook over top of Channel protection & pounded to ft snug.

16. Stakes shall also be placed at the ends of Channel protection to hold it in place.

17. Staking depth for sand and silt loam soils shall be 12 in (300mm), and 8 in (200mm) for clay soils.

18. Channel protection may be seeded at the time of application, seed selection will be determined by the Engineer.

19. Seeded Channel protection should not be installed prior to seasons where growing vegetation is diffcult.

20. Seed shall be thoroughly mixed with the GrowingMedia tm prior to constructionor injected into GrowingMedia tm at time of application.

21. Optional biotechnical engineeringwith live stakes should be conducted after staking is complete.

22. Seeded Channel protection shall be thoroughly watered after installation and allowed to settle for 1 week.

INSPECTION and MAINTENANCE

Routine inspection should be conducted within 24 hrs of a runoff event for the frst year after installation or until permanent vegetation has established. If

product dislodgement occurs, or vegetation does not establish, Channel protection should be repaired and/ or reseeded. If bank or bed erosion occurs, the area should be repaired immediately. Vegetation practices should be inspected for noxious or invasive weeds.

1. The Contractor shall maintain the Channel protection in a functional condition at all times and it shall be routinely inspected.

2. Seeded Channel protection shall be maintained until a uniform 70% minimum cover of the applied area has been vegetated, or permanent vegetation has established.

3. Seeded Channel protection may need to be irrigated in hot and dry weather and seasons, or arid and semi-arid climates to ensure vegetation establishment.

4. Where a Channel protection fails or becomes dislodged, the Contractor will ensure the product is in good contact with the soil, repair, and use additional staking if necessary.

5. Where bank or bed erosion occurs, the Contractor will regrade the soil if necessary and repair or replace the Channel protection.

6. Where vegetation does not establish the Contractor will reseed, replant, or provide an approved and functioning alternative.

7. Channel protection shall be left on-site and become part of the permanent landscape, unless otherwise specifed by the Engineer.

8. Regular mowing of grass vegetation on seeded Channel protection to a minimum height of 4 in (100mm) and a maximum height of 10 in (250mm) will deter invasive weeds, allow sunlight to kill captured pathogens, and provide maximum sediment removal effciency and sediment storage capacity in the vegetation.

9. Storm debris and trash deposited on Channel protection should be removed immediately.

10. Sediment shall be removed if it reaches 25% of the height of the vegetation (mowed) to prevent diversion of storm runoff and reduction of vegetation health and cover.