324 | Filtrexx Low Impact Design Manual | Version 8.0

10. Filtrexx ® Sediment control is not to be used in perennial, ephemeral, or intermittent streams.

See design drawing schematic for correct Filtrexx ® Sediment control installation (Figure 1.1).

INSPECTION and MAINTENANCE

Routine inspection should be conducted within 24 hrs of a runoff event or as designated by the regulating authority. Sediment control should be regularly inspected to make sure they maintain their shape and are producing adequate hydraulic fow-through. If ponding becomes excessive, additional Sediment control may be required to reduce effective slope length or sediment removal may be necessary. Sediment control shall be inspected until area above has been permanently stabilized and construction activity has ceased

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

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

3. The Contractor shall remove sediment at the base of the upslope side of the Sediment control when accumulation has reached 1/2 of the effective height of the Sediment control, or as directed by the Engineer. Alternatively, a new Sediment control can be placed on top of and slightly behind the original one creating more sediment storage capacity without soil disturbance.

4. Sediment control shall be maintained until disturbed area above the device has been permanently stabilized and construction activity has ceased.

5. The FilterMedia tm will be dispersed on site once disturbed area has been permanently stabilized, construction activity has ceased, or as determined by the Engineer.

6. For long-term sediment and pollution control applications, Sediment control can be seeded at the time of installation to create a vegetative fltering system for prolonged and increased fltration of sediment and soluble pollutants (contained vegetative flter strip). The appropriate seed mix shall be determined by the Engineer.

Slope Percent

Maximum Slope Length Above Sediment Control in Feet (meters)* 8 in (200 mm) Sediment control

12 in (300 mm) Sediment control

18 in (450 mm) Sediment control

24 in (600mm) Sediment control

32 in (800mm) Sediment control 6.5 in (160 mm)**

9.5 in (240 mm) **

14.5 in (360 mm) **

19 in (480 mm) **

26 in (650 mm) **

2 (or less) 600 (180) 750 (225) 1000 (300) 1300 (400) 1650 (500) 5 400 (120) 500 (150) 550 (165) 650 (200) 750 (225) 10 200 (60) 250 (75) 300 (90) 400 (120) 500 (150) 15 140 (40) 170 (50) 200 (60) 325 (100) 450 (140) 20 100 (30) 125 (38) 140 (42) 260 (80) 400 (120) 25 80 (24) 100 (30) 110 (33) 200 (60) 275 (85) 30 60 (18) 75 (23) 90 (27) 130 (40) 200 (60) 35 60 (18) 75 (23) 80 (24) 115 (35) 150 (45) 40 60 (18) 75 (23) 80 (24) 100 (30) 125 (38) 45 40 (12) 50 (15) 60 (18) 80 (24) 100 (30) 50 40 (12) 50 (15) 55 (17) 65 (20) 75 (23)

* Based on a failure point of 36 in (0.9 m) super silt fence (wire reinforced) at 1000 ft (303 m) of slope, watershed width equivalent to receiving length of sediment control device, 1 in/ 24 hr (25 mm/24 hr) rain event.

** Effective height of Sediment control after installation and with constant head from runoff as determined by Ohio State University.