Page 26 - Section4.2.1-SWPPPCutSheet-FiltrexxStormWaterBlanket

Post-Construction | Section 2: Storm Water Management | 389

SWPPP Cut Sheet -2.6. Filtrexx ® Filtration System

contaminated water is not acceptable.

5. If Filtration system baffe becomes clogged with sediment or hydraulic fow is signifcantly reduced it may be replaced with a new baffe.

6. If undercutting occurs, areas may be plugged with sand or additional FilterMedia tm . Leveling/minor grading may be required to increase surface contact w/ Filtration system Soxx tm .

7. Filtration system shall be maintained until disturbed area above the device has been permanently stabilized and construction activity has ceased.

8. Filtration system shall be maintained until contaminated water has fully percolated through the device.

9. FilterMedia tm , GrowingMedia tm , sediment, and fltrate may be dispersed on site if there are no concerns with soil and water contamination, or as determined by the Engineer.

10. If Filtration system is to be vegetated, the Contractor shall maintain the vegetation in the Filtration system in a functional condition at all times and it shall be routinely inspected.

11. Vegetated Filtration systems shall be maintained until a uniform minimum cover of 70% of the applied area has been vegetated or permanent vegetation has established.

12. Vegetated Filtration systems may need to be irrigated in hot and dry weather and seasons, or arid and semi-arid climates to ensure vegetation establishment.

13. Where Filtration system vegetation does not establish, it fails, or rilling occurs, the Contractor will repair, reseed, or provide an approved and functioning alternative.

14. Regular mowing of Filtration system vegetation to a min. ht of 4 in (100mm) and a max. ht of 10 in (250mm) will deter invasive weeds, allow sunlight to kill captured pathogens.

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