1710 W MARINE VIEW DR 2024-01-03

Figure 7-2- Runoff Treatment BMP Selection Step 1: Determine the receiving waters and Pollutants of concern based on off -site analysis Step 2: Determine if Yes an Oil Control BMP Is required Select a Pretreatment BMP (if not already provided. e.g. permeable No pavement or bioretention) • Presettling Basin Step 3: Determine if it is Yes • Any Basic Treatment BMP practicable to provide Runo • Manufactured Treatment Device Treatment by Infiltrating into • A Detention BMP designed to the native soil meet Flow Control requirements No 4: Determine If a Yes - Apply Infiltration Treatment EBis • infiltration Basin MP Required • Infiltration Trench No • Bioretention • Permeable Pavement Step 5: Determine if an Enhanced Treatment **Runoff Treatment BMP BMP is Required Selection Complete** No Step 6: Select a Basic Treatment BMP Note: This flow chart does not Include all Runoff Treatment BMP options. Review the text In this section for all options for each Runoff Treatment Performance GoaL DFPARTMFNT OF ECOLOGY State of Washington 71 f 0 • Sand Filters • Media Filter Drain • Biofiltration Swales • Filter Strips • Wetponds/Wetvaults • Stormwater Treatment Wetlands • Combined Detention/Wetpool Facilities • Bioretention • Manufactured Treatment Devices **Runoff Treatment BMP Selection Complete" Select an Oil Control BMP • API Separator • CP Separator • Linear Sand Filter Manufactured Treatment j Device Select a Phosphorus Treatment BMP • Large Sand Filter • Large Wetpond • Manufactured Treatment Device • Two Facility Treatment Train Determine if an Enhanced Treatment BMP is required No Yes "Runoff Treatment BMP Selection Complete"* Yes y - Is the selected Phosphorus Treatment BMP also listed as an Enhanced Treatment BMP? IF No Yes Select an Enhanced Treatment BMP **Runoff • Large Sand Filter Treatment • Stormwater Treatment Wetland BMP • CAVFS Selection • Bioretention Complete" • Media Filter Drain • Manufactured Treatment Device • Two Facility Treatment Train **Runoff Treatment BMP Selection Complete — Runoff Treatment BMP Selection Flow Chart Revised January 2019 Please see http://www.ecy.wa.govlcopyiight.html for copyright notice including permissions. limitation of liability. and disclaimer.