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ISOUNDVIEW TECHNOLOGY CENTER <br />EVERETT, WA <br />I <br />h <br />I <br />1 <br />Flow Chart for Determining LID MR k5 Requirements <br />F <br />xs the protect dix large to flow Ctxitrd Exempt Waters <br />Iper Minimum Requirement (MR) 07)1 <br />ye-, <br />REQUIRED- implement the followmg BMPs <br />whet feaAW, <br />AMP TS.13: PosbComtruchon Sal <br />Quality and Depth <br />AMP T5 10A, A, or C: Downspout Full <br />Infiltration, Downspout Dispersion <br />Systems, or Perforated Stub out <br />Connectom <br />AMP TS 11 or TS 12r Concentrated flow <br />Dspetuon or Sheet Flow Dispersion <br />NQi REQUIRED, Achievement of the LID <br />Performance Standard. Applying the other <br />BMPs in list Nl or list 02 <br />No <br />Does the project trigger only MRs No, the project <br />Nl N5> (Per Figure 3, 2 or Figure triggered only <br />3 3 in Append.■ 1 of the 2013 2018 MR 02 No additional <br />WWA Phase 11 Permit & Phase I requirements <br />Permit ) <br />Did the project developer doow to meet the <br />LID Performance StancarW <br />No, project developer _r <br />chose list N1 yt <br />/ No, the protect <br />triggered MRs Nl - 11`9. <br />reS <br />/ 1, the ptojec I inside the UGA? <br />No, the project is <br />outside the WA_ <br />Is the project on a parcel of <br />S acres or larger? <br />No <br />Did the project developer <br />REQUIRED, For each surface, choose to meet the LID <br />consider the BMN in the order <br />Performance Standard? <br />Irsted in List81 for that type of <br />surface. the the fast AMP that rs <br />considered feasible <br />yfs <br />NOT REQUIRED- Achievement of <br />/ <br />the I ID Performance Standard <br />REQUIRED Meet the UD Pnformance <br />Standard through the use of IU AMP(s) in <br />the 2014 SWMMWW except for Ram Gardens <br />(the use of Siorelention rsacceptable). <br />REQUIRED for Proiects Tr.aeerma MR 01.9•: <br />Apply AMP T5.13 Post Construction Sod <br />Owkty and Depth <br />NOT REQUIRED- Applying the BMP% m list 91 <br />or Lrsl N2. <br />No, project <br />developer <br />(tic" I nt 92 <br />REQUIRED. For each surface, <br />eonvder the AMPS in the <br />order listed m List •2 for <br />that type of surface. Use the <br />first AMP that n considered <br />feauble <br />NOT REQUIRED. <br />Ac hreverrient of the LID <br />Performance Standard. <br />Yes <br />REQUIRED: Meet the LID <br />Performance Standard through the <br />use of AU AMP(%) in the M14 <br />SW MMWW except for Ram Garden-, <br />I the use of Biprel"bon 11 <br />acceptable) <br />If the project can't meet the LID <br />Performance Standard, it must seek <br />and be granted an exception / <br />variance. <br />REQUIRED. Apply AMP TS 13 Post <br />(omtructi i Sal Quality and Depth <br />NOT REQUIRED: Applying the AMP% <br />in Lrst Nl or List 02. <br />Recommended by Ecology for projects lriggennit MR 01 5 <br />The BMPs in List #2 (below) was evaluated for feasibility for each type of surface. The first BMP that <br />was determined feasible was selected for on -site use. <br />List #2 BMPs: <br />Lawn and Landscaped Areas: <br />• Post -Construction Soil Quality and Depth: Determined feasible. <br />Roofs: <br />• Full Dispersion: Determined infeasible due to the vegetated flowpath setbacks from the <br />proposed walls and property line, which leaves an insufficient on -site area to provide the <br />required vegetated pervious area. <br />• Bioretention: Determined infeasible due to insufficient on -site area to provide the <br />required bioretention area to treat the full roof area. Additionally, bioretention would <br />MAY 23, 2017 STORMWATER DRAINAGE REPORT PAGE 5 <br />