Page 17 - Section4.2.1-SWPPPCutSheet-FiltrexxStormWaterBlanket

380 | Filtrexx ® Low Impact Design Manual | Version 8.0

7. Land surface shall be cleared of debris, including rocks, roots, large clods, and sticks prior to Bank stabilization installation.

8. Waterwaybankor shoreline shall bemade smooth prior to installation of Bank stabilization; soil bed may be compacted and graded prior to installation.

9. If toe-cutting is an issue at waterway bed and slope interface, excavation shouldbe performed at interface belowcreek bed level to allowplacement of Bank stabilization Soxx tm

10. Excavation should be to a minimum of 1 ft (300mm) below scour line for streams with fow depths of 6 in (150mm) or greater.

11. An optional geogrid fabric may be anchored to the bank to provide additional bank stability and anchoring surface for the Bank stabilization system.

12. On-site fabrication of Bank stabilization will ensure a continuous length sock system. Upon completing one section of sock flling

(approximately 100-200 ft [30-60m]), the next section shall be ‘sleeved’ over the completed section by a minimum of 1 ft (300mm). A stake shall be placed in the overlap section, securing the two sections.

13. Bank stabilization shall be placed parallel to water fow & perpendicular to wave action, socks are tightly stackedor abutted topreventwater seepage between/underneath system.

14. For stacking and terrace applications, larger diameter Bank stabilization Soxx tm will be placed on the bottom of the installation and sequentially smaller diameter Bank stabilization Soxx tm placed on top as the construction moves upslope and away from the waterline.

15. Stabilization applications below the waterline will use pea gravel and small rock in the Bank stabilization Soxx tm at the base of the Bank stabilization system and GrowingMedia tm in the Bank stabilization Soxx tm where vegetation will be established above the waterline.

16. In areas where waterline fuctuates below and above theBank stabilizationSoxx tm systemcustom soil blends may be used, as directed by the Engineer. Custom soil blends may include GrowingMedia tm , topsoil, sand, pea gravel, or other small aggregate.

17. For Bank stabilization terrace applications, areas between Bank stabilization Soxx tm should be on a level grade, and backflled with seeded GrowingMedia tm . Waterline should be below terraced areas receiving backfll.

18. Once in place, Bank stabilization Soxx tm shall be lightly compacted to tighten seal between socks and encourage even water fow over the surface of the system.

19. Bank stabilization shall not be installed on banks or shorelines greater than 1:1, and 3:1 if mowing will be conducted to manage vegetation.

20. Stakes shall be installed through the middle of the Bank stabilization Soxx tm on a minimum of 5 ft (1.5m) centers, using 2 in (50mm) by 2 in (50mm) by 3 ft (1m) wood stakes; or

21. L-shaped rebar may be installed through middle of Bank stabilization Soxx tm on 5 ft (1.5m) centers, where “L” shall form a hook over top of Bank stabilization Soxx tm & pounded snug.

22. Stakes shall also be placed at the ends of Bank stabilization Soxx tm to hold it in place.

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

24. Bank stabilization shall be seeded at the time of application; seeded Bank stabilization should not be installed prior to seasons where growing vegetation is diffcult.

25. Seed shall be thoroughly mixed with the GrowingMedia tm prior to construction or injected into GrowingMedia tm at time of application.

26. Optional biotechnical engineering with live stakes, tubers, seedlings, or plugs should be conducted after staking is complete.

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

28. Live stakes should be spaced 5-7 ft (1.5-2.1m) apart, and planted vertically with one end planted through the Bank stabilization and at least 2 in (50mm) into native soil.

29. Seeded and/or live staked Bank stabilization shall be thoroughly watered after installation and allowed to settle for 1 week.

30. Drip tape may be installed within the Bank stabilization Soxx tm during construction to provide irrigation for establishing vegetation (water source should located and secured).

31. 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 event for the frst year after installation or until permanent vegetation has established.

1. Seeded Bank stabilization shall be maintained