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SOUNDVIEW TECHNOLOGY CENTER EVERETT, WA Response: On-site stormwater runoff will be collected and transported via a system of catch basins and underground storm pipes to one of five detention systems. All of the stormwater is being collected, detained, treated, and released. The detained stormwater will be control-released from the vaults at the historical discharge rate. See below for the Flow Chart for Determining LID MR#5 Requirements. Flow Chart for Determining LID MR#5 Requirements Does the project discharge to Flow Control Exempt Waters (pet Minimum Requirement(MR)0)j yes REQUIRED:Implement the following AMPS No where feasible: No the project Does the project trigger-only MRs AMP TS.13:Post-Construction Sal 41 051(Per Figure 3.2 or Figure triggered only Quality and Depth 3 3 in Appendix 1 of the 2013 2018 MR 02 No additional AMP TS 10A,B,or C:Downspout Full WWA Phase II Permit&Phase 1 requirements Infiltration,Downspout Dispersion Permit.) Systems,or Perforated Stub-out Conne tiores No,the project AMP TS.11 or T9.12:Concentrated Flow triggered MRs 91-09. Dispersion or Sheet Flow Dispersion Yes is the project inside the 11GA� NOT REQUIRE_D.Achieement of the LID Perform.rn<e Standard.Applying the other No,the project is AMPS m list#1 or list#2 outside the MA, Yes Did the project developer choose to meet the LID Performance Standard? Is the project on a parcel of S acres or larger? No,project developer No chose List 01. Yet YPS Did the project developer REQUIRED.For each surface, choose to meet the LID consider the 8MPs in the order REQUIRED:Meet the LID listed in List let for that type of Performance Standard? Performance Standard through the surface.Lkc lire first AMP that is use of Iny RMP(s)in the 2014 considered feasible. Yes SWMMWW except for Rain Gardens No,project (the use of Bioretention is NOT REQUIRED.Achievement of dcrcloper acceptable). the LID Performance Standard, chose List#2, If the project can't meet the LID REQUIRED Meet the LID Performance Performance Standard,it must seek REQUIRED:For each surface, and be granted an exception/ Standard through the use of 1ny BMP(s)in consider the AMPS in the variance. the 1014 SW MMWW except for Rain Gardens order listed in list 62 for (the use of Aloretention is acceptable), that type of surface.Use the REQUIRED:Apply AMP TS-13 Post first AMP that is conside.Ye•d Construction Soil Quality and Depth. REQUIRED for Projects Tnittterrna MR 91=96: feasible. Apply AMP T5.13 Post-Construction Sod PJOT REQUIRED:Applying the AMPS Quality and Depth. NOT REQUIRED: in List e1 or List 02 Achievement of the LID NOT REQUIRED'Applying the RMPs in List al Performance Standard. or Lrst R2. 'Recommended by Ecology for projects triggering MR PI-S. The BMPs in List#2 (below) was evaluated for feasibility for each type of surface. The first BMP that was determined feasible was selected for on-site use. List#2 BMPs: Lawn and Landscaped Areas: • Post-Construction Soil Quality and Depth:Determined feasible. Roofs: SEPTEMBER 23, 2022 STORMWATER DRAINAGE REPORT PAGE 5