R2017-53 Contract with Entler Excavating for Nelson Park Neighborhood Combined Sewer Project CP 2012-22

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C. Structural Practices: Provided below is a description of structural practices that will be implemented, to the degree attainable, to divert flows from exposed soils, store flows or otherwise limit runoff and the discharge of pollutants from exposed areas of the site. Such practices may include but are not limited to: perimeter erosion ' barrier, earth dikes, drainage swales, sediment traps, ditch checks, subsurface drains, pipe slope drains, level spreaders, storm drain inlet protection, rock outlet protection, reinforced soil retaining systems, gabions, and temporary or permanent sediment basins. The installation of these devices may be subject to Section 404 of the Clean Water Act. The following structural practices will be used for this project: ® Perimeter Erosion Barrier ❑ Rock Outlet Protection ❑ Temporary Ditch Check ® Riprap ® Storm Drain Inlet Protection ❑ Gabions ❑ Sediment Trap ❑ Slope Mattress ❑ Temporary Pipe Slope Drain ❑ Retaining Walls ❑ Temporary Sediment Basin ❑ Slope Walls ❑ Temporary Stream Crossing ❑ Concrete Revetment Mats ' ® Stabilized Construction Exits ❑ Level Spreaders ❑ Turf Reinforcement Mats ❑ Other(specify) ❑ Permanent Check Dams ❑ Other(specify) ❑ Permanent Sediment Basin ❑ Other(specify) ❑ Aggregate Ditch ❑ Other(specify) ❑ Paved Ditch ❑ Other(specify) ' D. Treatment Chemicals Will polymer flocculants or treatment chemicals be utilized on this project: ❑ Yes ® No r E. Permanent Storm Water Management Controls: Provided below is a description of measures that will be installed during the construction process to control volume and pollutants in storm water discharges that will occur after construction operations have been completed. The installation of these devices may be subject to Section 1 404 of the Clean Water Act. 1. Such practices may include but are not limited to: storm water detention structures (including wet ponds), storm water retention structures, flow attenuation by use of open vegetated swales and natural depressions, infiltration of runoff on site, and sequential systems(which combine several practices). The practices selected for implementation were determined on the basis of the technical guidance in Chapter I 41 (Construction Site Storm Water Pollution Control)of the IDOT Bureau of Design and Environment Manual. If practices other than those discussed in Chapter 41 are selected for implementation or if practices are applied to situations different from those covered in Chapter 41, the technical basis for such decisions will be explained below. 2. Velocity dissipation devices will be placed at discharge locations and along the length of any outfall channel as necessary to provide a non-erosive velocity flow from the structure to a water course so that the natural physical and biological characteristics and functions are maintained and protected (e.g. maintenance of ' hydrologic conditions such as the hydroperiod and hydrodynamics present prior to the initiation of construction activities). Page 4