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Puyallup Exception: Following the Puyallup Tribes of Indians Land Settlement Act of <br /> 1989, 25 U.S.C. §1773;the permit does apply to land within the Puyallup <br /> Reservation except for discharges to surface water on land held in trust by the <br /> federal government. <br /> 5. Stormwater from any site covered under an existing NPDES individual permit in which <br /> stormwater management and/or treatment requirements are included for all stormwater <br /> discharges associated with construction activity. <br /> 6. Stormwater from a site where an applicable Total Maximum Daily Load (TMDL) <br /> requirement specifically precludes or prohibits discharges from construction activity. <br /> F. Erosivity Waiver <br /> Construction site operators may qualify for an Erosivity Waiver from the CSWGP if the following <br /> conditions are met: <br /> 1. The site will result in the disturbance of fewer than five (5) acres and the site is not a <br /> portion of a common plan of development or sale that will disturb five (5) acres or <br /> greater. <br /> 2. Calculation of Erosivity"R"Factor and Regional Timeframe: <br /> a. The project's calculated rainfall erosivity factor("R" Factor) must be less than five <br /> (5) during the period of construction activity, (See the CSWGP homepage <br /> http://www.ecy.wa.gov/programs/wq/stormwater/construction/index.htmi for a <br /> link to the EPA's calculator and step by step instructions on computing the "R" <br /> Factor in the EPA Erosivity Waiver Fact Sheet).The period of construction activity <br /> starts when the land is first disturbed and ends with final stabilization. In addition: <br /> b. The entire period of construction activity must fall within the following timeframes: <br /> i. For sites west of the Cascades Crest: June 15—September 15. <br /> ii. For sites east of the Cascades Crest, excluding the Central Basin: <br /> June 15—October 15. <br /> iii. For sites east of the Cascades Crest,within the Central Basin: no timeframe <br /> restrictions apply.The Central Basin is defined as the portions of Eastern <br /> Washington with mean annual precipitation of less than 12 inches. For a map of <br /> the Central Basin (Average Annual Precipitation Region 2), refer to: <br /> http://www.ecy.wa.gov/pmgrams,/wg/stormwater/construction/resourcesguida <br /> nce.html. <br /> 3. Construction site operators must submit a complete Erosivity Waiver certification form at <br /> least one week before disturbing the land. Certification must include statements that the <br /> operator will: <br /> a. Comply with applicable local stormwater requirements; and <br /> b. Implement appropriate erosion and sediment control BMPs to prevent violations of <br /> water quality standards. <br /> 4. This waiver is not available for facilities declared significant contributors of pollutants as <br /> defined in Special Condition S1.6.1.b or for any size construction activity that could <br /> Construction Stormwater General Permit Page 6 <br />