# Erosion and Sediment Control

# Examples

+-----------------------------------------------------------------------+
| **4R Examples**                                                       |
+-----------------------------------------------------------------------+
| During construction, erosion control measures (i.e., silt fence,      |
| sediment logs) will be implemented in non-riparian upland areas and   |
| on approach embankments.                                              |
|                                                                       |
| Erosion control to be performed will consist of application of        |
| erosion control materials within non-riparian upland areas and        |
| approach fills, embankment slopes, excavation slopes, and other areas |
| designated by the Project Engineer. These materials will consist of   |
| fiber, native grass and seed, commercial fertilizer, and water.       |
| Additional erosion control measures that will be implemented include: |
|                                                                       |
| 1.  An *Erosion and Sediment Control Plan* will be prepared and       |
|     included in the final construction plans. This plan will be       |
|     provided to the National Marine Fisheries Service (NMFS) for      |
|     review.                                                           |
|                                                                       |
| 2.  Any construction activities proposed within the ordinary high     |
|     water line of a water of the United States, excluding passive     |
|     vegetation removal activities above ground level (no major soil   |
|     disturbance), will be restricted exclusively to the dry season    |
|     (May 1-October 31).                                               |
|                                                                       |
| 3.  Major ground disturbing activities will be restricted to the dry  |
|     season, which is defined as May 1-October 31. Ground disturbing   |
|     may occur outside the defined dry season based on a forecast of   |
|     dry weather and permission from the National Marine Fisheries     |
|     Service (NMFS). Permission may be granted by email. Temporary     |
|     erosion and sediment control structures must be in place and      |
|     operational at the end of each construction day and maintained    |
|     until disturbed ground surfaces have been successfully            |
|     re-vegetated.                                                     |
|                                                                       |
| 4.  Areas where wetland and upland vegetation need to be removed will |
|     be identified in advance of ground disturbance and limited to     |
|     only those areas that have been approved by the FHWA.             |
|                                                                       |
| 5.  Erosion control (i.e., hydroseeding) will be applied to areas     |
|     where vegetation has been removed to reduce short-term erosion    |
|     prior to the start of the rainy season. Soils will not be left    |
|     exposed during the rainy season.                                  |
|                                                                       |
| 6.  Filter fences and catch basins will be placed below all           |
|     construction activities and all perennial and intermittent        |
|     streams to intercept sediment before it reaches the waterway.     |
|     These structures will be installed prior to any clearing or       |
|     grading activities.                                               |
|                                                                       |
| 7.  After construction is complete waste sites will be reclaimed      |
|     (graded and vegetated) to reduce the potential for erosion.       |
|                                                                       |
| 8.  Sediment control measures will be in place prior to the onset of  |
|     the rainy season and will be monitored and maintained in good     |
|     working condition until the disturbed areas have been             |
|     re-vegetated.                                                     |
|                                                                       |
| In addition, Best Management Practices will be followed. A detailed   |
| description of the BMP's for the project can be found in the          |
| Environmental Assessment.                                             |
+-----------------------------------------------------------------------+
| At this time, it is anticipated that only standard erosion and        |
| sediment control measures will be required for this project including |
| silt fence, inlet protection, sediment control logs, check dams and   |
| other best management practices in accordance with the NPDES          |
| criteria.                                                             |
+-----------------------------------------------------------------------+
| Silt fences are proposed at the toe of fill slopes parallel to the    |
| toe. Erosion control log check dams are proposed for erosion control  |
| in ditches. Erosion logs are also proposed for inlet protection.      |
| Bonded fiber matrix is proposed for use on slopes steeper than 1:2    |
| (V:H).                                                                |
+-----------------------------------------------------------------------+
| **3R Examples**                                                       |
+-----------------------------------------------------------------------+
| At this time, it is anticipated that only standard erosion and        |
| sediment control measures will be required for this project including |
| silt fence, inlet protection, sediment control logs, and other best   |
| management practices in accordance with the NPDES criteria. Some      |
| temporary erosion control devices were removed from the design to     |
| install permanent check dams and better utilize project costs. Due to |
| soils/sands in the project area, the usefulness and effectiveness of  |
| logs and wattles are limited                                          |
+-----------------------------------------------------------------------+
| During construction, temporary erosion control measures will be       |
| implemented to avoid and reduce impacts to adjacent areas in the park |
| due to runoff. As appropriate, dust abatement will also be required   |
| during excavation activities.                                         |
|                                                                       |
| Permanent erosion control measures will be implemented at the outlet  |
| of the pipe; such as placing revet mattresses to dissipate the energy |
| and reduce the velocity of the water as it exits the pipe and,        |
| therefore, reduce the sliding of the soils and prevent further        |
| washing away of the slope. Following completion of construction, the  |
| Contractor will install a rolled erosion control blanket and seed the |
| disturbed slopes with a specific seed mix developed by the NPS.       |
|                                                                       |
| In addition, the FHWA *Best Management Practices for Erosion and      |
| Sediment Control* will be followed. A detailed description of the     |
| BMP's can be found in Chapter 7 of the *Project Development and       |
| Design Manual* located on FHWA's website.                             |
+-----------------------------------------------------------------------+
| Standard erosion and sediment control measures will be required for   |
| the project, including silt fence, inlet protection, sediment control |
| logs, and other Best Management Practices (BMP's) in accordance with  |
| the NPDES criteria. Erosion control plans have been developed and are |
| included in the plans.                                                |
|                                                                       |
| The erosion and sediment control plans also show locations of         |
| temporary plastic fence. This fencing is shown around environmentally |
| sensitive areas, including wetlands, riparian areas, and              |
| archaeological sites. It is noted in the plans to install the fence   |
| prior to any soil disturbance activities, and not to disturb any      |
| areas beyond the fence.                                               |
+-----------------------------------------------------------------------+