388 | Filtrexx ® Low Impact Design Manual | Version 8.0

the Filtration system.

10. The perimeter FilterSoxx tm shall be injected with seeded GrowingMedia tm at the time of installation.

11. Baffes or weirs shall be installed perpendicular to fow across the entire width of the fow area at or near Filtration system entrance and at the exit.

12. Baffes may be injected with Filtrexx ® focculants (with FilterMedia tm ) to target specifc pollutants at time of installation.

13. Flow diversion Soxx tm injected w/ seed & GrowingMedia tm shall be placed at perimeter walls & perimeter wall/baffe intersect to direct fow/reinforce wall/baffes.

14. Once in place, FilterSoxx tm shall be lightly compacted to prevent water undercutting of FilterSoxx tm .

15. Stakes shall be installed through the middle of the FilterSoxx tm on a minimum of 10 ft (3m) centers, using 2 in (50mm) by 2 in (50mm) by 3 ft (1m) wooden stakes.

16. Stakes shall also be placed at the ends of FilterSoxx tm to hold them in place.

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

18. Once all FilterSoxx tm are in place a turf reinforcement mat (TRM), rolled erosion control blanket (RECB), or LockDown tm Netting may be placed on the soil surface.

19. TRMs and RECBs should follow manufacturers’ installation and stapling procedures.

20. LockDown tm Netting shall be anchored to the soil using 6-8 in (150-200mm) sod staples to be driven along the entire perimeter of the net and netting area.

21. Staples for LockDown tm Netting shall be spaced no more than 24 in (600mm) apart on all sides.

22. Where more than one roll of LockDown tm Netting is required for area width or area length, netting edges shall be overlapped by a minimum of 6 in (150mm).

23. LockDown tm Netting shall be installed from top to bottom (never across) on the slope and under the entire area of the fll blanket.

24. Filtration system fll blanket shall use GrowingMedia tm applied to 100% of the TRM, RECB or LockDown tm Netting fll blanket area and shall be 2 to 4 in (50-100mm) deep.

25. Filtration system fll blanket may be seeded at the time of application; seed selection will be determined by the Engineer.

26. Seeded Filtration system should not be installed

prior to seasons where growing vegetation is diffcult.

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

28. After fll blanket has been applied another RECB or LockDown tm Netting may be installed on top of the fll blanket to prevent GrowingMedia tm transport and wash.

29. Installation procedures for RECBs and LockDown tm Netting used on top of the GrowingMedia tm fll blanket shall be the same as the installation underneath the fll blanket.

30. Optional biotechnical engineering with live stakes, tubers, seedlings, or plugs should be conducted after staking of FilterSoxx tm is complete.

31. Live stakes should be from a live hardwood species and cuttings should be 1 to 3 ft (300-900mm) long.

32. Live stakes should be spaced 3 to 5 ft (1-1.5m) apart, andplanted verticallywithone endplanted through the FilterSoxx tm and at least 2 in (50mm) into GrowingMedia tm .

33. Seeded and/or live staked Filtration system shall be thoroughly watered after installation and allowed to settle for 1 week.

34. Drip tapemay be installedwithin the FilterSoxx tm during construction to provide irrigation for establishing vegetation (water source should be located and secured).

35. If drip irrigation systemis installed andmunicipal water or a pump will be utilized, a pressure reducer may be required to manage fow and prevent drip tape from bursting.

INSPECTION and MAINTENANCE

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

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

2. If the Filtration system has been damaged, it shall be repaired, or replaced if beyond repair.

3. The Contractor shall remove sediment at base of upslope side of Filtration system baffe when accumulation reaches 1/2 the effective ht of Soxx ™ , or as directed by Engineer.

4. If Filtration system becomes clogged w/ debris or solids, it shall be maintained to proper hydraulic fow through. Overfow/undercutting of