1622 E MARINE VIEW DR WHOLE SITE 2022-02-01

C. Erosivity Waiver Construction site operators may qualify for an erosivity waiver from the CSWGP if the following conditions are met: 1. The site will result in the disturbance of fewer than 5 acres and the site is not a portion of a common plan of development or sale that will disturb 5 acres or greater. 2. Calculation of Erosivity "R" Factor and Regional Timeframe: a. The project's rainfall erosivity factor ("R" Factor) must be less than 5 during the period of construction activity, as calculated (see the CSWGP homepage httD://www.ecv.wa.aov/Droarams/wo/storm.water/construction/i.ndex..html for a link to the EPA's calculator and step by step instructions on computing the "R" Factor in the EPA Erosivity Waiver Fact Sheet). The period of construction activity starts when the land is first disturbed and ends with final stabilization. In addition: b. The entire period of construction activity must fall within the following timeframes: i. For sites west of the Cascades Crest: June 15 — September 15. ii. For sites east of the Cascades Crest, excluding the Central Basin: • June 15 — October 15. iii. For sites east of the Cascades Crest, within the Central Basin: no additional timeframe restrictions apply.'The Central Basin is defined as the portions of Eastern Washington with mean annual precipitation of less than 12 inches. For a map of the Central Basin (Average Annual Precipitation Region 2), refer to http://www.ecy.wa.goyJ 2rogams/wq/stormwater/ construction/resourcesgui.dan.ce.html . 3. Construction site operators must submit a complete Erosivity Waiver certification form at least one week before disturbing the land. Certification must include statements that the operator will: a. Comply with applicable local stormwater requirements; and b. Implement appropriate erosion and sediment control BMPs to prevent violations of water quality standards. 4. This waiver is not available for facilities declared significant contributors of pollutants as defined in Special Condition S 1.13. Lb. or for any size construction activity that could reasonably expect to cause a violation of any water quality standard as defined in Special Condition S 1.B.l.b.ii. 5. This waiver does not apply to construction activities which include non- • stormwater discharges listed in Special Condition S1.C.3. Construction Stornnvater General Permit Page