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(PAM),the early application of gravel base on areas to be paved, and dust <br /> control. <br /> b. The Permittee must control stormwater volume and velocity within the site to <br /> minimize soil erosion. <br /> c. The Permittee must control stormwater discharges, including both peak flow <br /> rates and total stormwater volume,to minimize erosion at outlets and to <br /> minimize downstream channel and stream bank erosion. <br /> d. Depending on the geographic location of the project, the Permittee must not <br /> allow soils to remain exposed and unworked for more than the time periods set <br /> forth below to prevent erosion: <br /> West of the Cascade Mountains Crest <br /> During the dry season(May 1 - September 30): 7 days <br /> During the wet season(October 1 -April 30): 2 days <br /> East of the Cascade Mountains Crest, except for Central Basin* <br /> During the dry season(July 1 -September 30): 10 days <br /> During the wet season(October 1 -June 30): 5 days <br /> The Central Basin*„ East of the Cascade Mountains Crest <br /> During the dry season(July 1 - September 30): 30 days <br /> During the wet season(October 1 -June 30): 15 days <br /> *Note: The Central Basin is defined as the portions of Eastern <br /> Washington with mean annual precipitation of less than 12 inches. <br /> e. The Permittee must stabilize soils at the end of the shift before a holiday or <br /> weekend if needed based on the weather forecast. <br /> f. The Permittee must stabilize soil stockpiles from erosion,protected with <br /> sediment trapping measures, and where possible,be located away from storm <br /> drain inlets,waterways, and drainage channels. <br /> g. The Permittee must minimize the amount of soil exposed during construction <br /> activity. <br /> h. The Permittee must minimize the disturbance of steep slopes. <br /> i. The Permittee must minimize soil compaction and,unless infeasible,preserve <br /> topsoil. <br /> 6. Protect Slopes <br /> a. The Permittee must design and construct cut-and-fill slopes in a manner to <br /> minimize erosion. Applicable practices include,but are not limited to,reducing <br /> continuous length of slope with terracing and diversions,reducing slope <br /> steepness, and roughening slope surfaces (for example,track walking). <br /> Construction Stormwater General Permit <br /> Page 31 <br />