2307 COLUMBIA AVE 2021-05-04 - Laserfiche WebLink

Table 1-2.5.1 On-Site Stormwater Management Requirements for Projects Triggering Minimum Requirements #1 - #9 P ,'ect Type and Location Requirement New develop -nt on any parcel inside Low Impact Development Performance the UGA, or new .-velopment outside the Standard and BMP T5.13: Post-Construction UGA on a parcel les than 5 acres Soil Quality and Depth (p.911); or List#2 (applicant option). New development outside e UGA on a Low Impact Development Performance parcel of 5 acres or larger Standard and BMP T5.13: Post-Construction • Soil Quality and Depth (p.911). Redevelopment on any parcel insid- the Low Impact Development Performance UGA, or redevelopment outside the U Standard and BMP T5.13: Post-Construction Soil Quality and Depth (p.911); or List#2 on a parcel less than 5 acres •plicant option). Redevelopment outside the UGA on a par-Lo mpact Development Performance cel of 5 acres or larger Standa • and BMP T5.13: Post-Construction Soil Quail • and Depth (p.911). Note: This table refers to the Urban Growth Area (UGA) . designated under the Growth Management Act(GMA) (Chapter 36.70A RCVV) of e State of Washington. If the Permittee is located in a county that is not subject to planni • under the GMA, the city limits shall be used. Low Impact Development Performance Standard Stormwater discharges shall match developed discharge durations to • e- developed durations for the range of pre-developed discharge rates from °° of the 2-year peak flow to 50% of the 2-year peak flow. Refer to the Standard Flo Control Requirement section in Minimum Requirement#7 for information about the assignment of the pre-developed condition. Project sites that must also meet minimum requirement#7—flow control -must match flow durations between 8% of the 2-year flow through the full 50-year flow. List#1: On-site Stormwater Management BMPs for Projects Triggering Minimum Requirements #1 through #5 For each surface, consider the BMP's in the order listed for that type of surface. Use the first BMP that is considered feasible. No other On-site Stormwater Man- agement BMP is necessary for that surface. Feasibility shall be determined by eval- uation against: 1. Design criteria, limitations, and infeasibility criteria identified for each BMP in this manual; and 2014 Stormwater Management Manual for Western Washington Volume I- Chapter 2-Page 56