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Erosion Control Wet Season RequirementsNote: This handout shall not be used as a substitute for codes and regulations. The Applicant is responsible for compliance w ith all codes and regulations, whether or not described in this document. DEPARTMENT OF COMMUNITY AND ECONOMIC DEVELOPMENT Page 1 of 1 | Published: 2/1/2018 Planning Division | 1055 South Grady Way, 6th Floor | Renton, WA 98057 | 425-430-7200 Website: rentonwa.gov EROSION CONTROL WET SEASON REQUIREMENTS Published: 2/1/2018 Any site with exposed soils during the wet season (October 1 to April 30) shall be subject to the special provisions below. In addition to the ESC cover measures (see Section D.2.1.2), these provisions include covering any newly seeded areas with mulch and identifying and seeding as much disturbed area as possible prior to September 23 in order to provide grass cover for the wet season. A “wet season ESC plan” must be submitted and approved by the City before work proceeds or continues. The following provisions for wet season construction are detailed in Appendix D of the 2017 City of Renton Surface Water Design Manual. Please ensure your site is protected and complies with the special provisions outlined below. Wet Season Special Provisions All of the following provisions for wet season construction are detailed in the referenced sections. These requirements are listed here for the convenience of the designer and the reviewer. 1.The allowed time that a disturbed area may remain unworked without cover measures is reduced to two consecutive working days, rather than seven (Section D.2.1.2). 2.Stockpiles and steep cut and fill slopes are to be protected if unworked for more than 12 hours (Section D.2.1.2). 3.Cover materials sufficient to cover all disturbed areas shall be stockpiled on site (Section D.2.1.2). 4.All areas that are to be unworked during the wet season shall be seeded within one week of the beginning of the wet season (Section D.2.1.2.6). 5.Mulch is required to protect all seeded areas (Section D.2.1.2.2). 6.Fifty linear feet of silt fence (and the necessary stakes) per acre of disturbance must be stockpiled on site (Section D.2.1.3.1). 7.Construction road and parking lot stabilization are required for all sites unless the site is underlain by coarse- grained soil (Section D.2.1.4.2). 8.Sediment retention is required unless no offsite discharge is anticipated for the specified design flow (Section D.2.1.5). 9.Surface water controls are required unless no offsite discharge is anticipated for the specified design flow (Section D.2.1.6). 10.Phasing and more conservative BMPs must be evaluated for construction activity near surface waters (Section D.2.4.3). 11.Any runoff generated by dewatering may be required to discharge to the sanitary sewer (with appropriate discharge authorization), portable sand filter systems, or holding tanks (Section D.2.2).