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SECTION 2.3 - DRAINAGE WORKS <br />Part 1 General <br />1.01 Scope <br />a. Drainage work consists of furnishing all plant, labor, equipment and materials necessary <br />for the construction and maintenance of drainage ways at locations where drainage ways <br />are necessary for removing surface runoff from the Class I Landfill with minimal soil <br />erosion. Adequate drainage ways to distribute runoff without ponding or erosion shall be <br />provided during all stages of the landfill operation and for any portions of the landfill <br />completed with intermediate cover or to final grades under this Agreement. <br />1.02 Interim Drainage Ways <br />a. Due to the proposed phased closure of the Class I Landfills, the Contractor will be <br />required to install interim drainage ways to meet the permanent system installed on the <br />55 -foot NGVD terrace. Contractor shall have the option of using alternative materials <br />and methods for the drainage ways to convey surface runoff down the face of the landfill <br />phases. Methods may include riprap channels, corrugated metal pipe lined channels, <br />plastic pipe lined channels or removable gabion baskets. Any altemative method used <br />shall effectively convey landfill runoff down the slope of the landfill phases, prevent its <br />entry into the solid waste, prevent erosion, cause no adverse environmental impact, be <br />acceptable to the County, and result in no additional cost to the County. <br />If the County determines that the method being used does not accomplish the results <br />stipulated above, County shall have the right to require Contractor to modify the methods <br />and materials used to accomplish the specified results. <br />Part 2 Materials <br />2.01 Soil for Grassed Drainage Ways <br />a. Grassed Drainage Ways shall be used on terraces to convey stormwater to interim <br />letdown drainage ways. Soil suitable for supporting growth of vegetation in drainage <br />ways shall be obtained from offsite sources or purchased from the County. <br />2.02 Erosion Control Fabric <br />a. Erosion control fabric shall be used on slopes where seed is used for the establishment of <br />grass cover. Jute or excelsior mat shall be as specified in the seeding section. <br />2.03 Straw <br />a. Straw for erosion control purposes shall be as specified in the seeding section. <br />2.3-1 <br />bp11 57YM-1R•97 <br />