1605 SE EVERETT MALL WAY WALMART 2018-01-01 MF Import

T 206.52Seattle,Washington i www.pac2.9510land.com TURNING VISIONS INTO REALITY discharges shall match developed discharge durations to pre-developed durations for the range of pre-developed discharge rates from 50% of the 2-year recurrence interval peak flow up to the full 50-year peak flow. The pre-developed condition to be matched shall be a forested land cover, unless otherwise allowed by the Manual. The project improvements do not: add net new impervious surface to the project, increase the 100 year storm runoff, or exceed 50% of the value of the existing site improvements. Therefore the project is not required to comply with minimum requirement #7. However, this stormwater site plan discusses Flow Control; see Section VIII for more information. Minimum Requirement #8: Wetlands Protection The discharge to wetlands shall maintain the hydrologic conditions, hydrophytic vegetation and substrate characteristics necessary to support existing and designated uses. The project does not directly or indirectly discharge into a wetland, therefore the project is not required to comply with minimum requirement#8. However, this stormwater site plan discusses the downstream drainage system; see Section II for more information. Minimum Requirement #9: Operation and Maintenance A Maintenance Plan that is consistent with the provisions in the Stormwater Management Manual shall be provided for all proposed stormwater facilities and BMPs along with the name(s) or the party (or parties) responsible for operation and maintenance. At private facilities, a copy of the Maintenance Plan shall be retained on-site or within reasonable access to the site and shall be transferred with the property to subsequent owners. A tracking log shall be kept and available, containing all maintenance activity that indicates what actions shall be taken. Due to the requirement of minimum requirement #6 above, an operation and maintenance plan is required. This stormwater site plan addresses Operation and Maintenance; see Section VIII for more information. ll. Site Assessment Topography The property varies in elevation from 518' to 534' (NAVD 88) with grades varying from 1.5% in paved areas to 70% in the landscaped area along the north/northeast property lines. An existing 2' —4' rockery is located adjacent to the landscaping along the north/northeast property lines. Existing site vegetation consists of landscaped islands in the Everett Mall Plaza Parcel III Retail Expansion Stormwater Site Plan Page 7