920 MILLWRIGHT LOOP S BASE FILE 2023-12-29

WATERFRONT PLACE CENTRAL A17 PROJECT SITE—HH SUMMARY PORT OF EYERETT—PSA 1-20154)OS MD No. 154016-021.02 Maintenance for outlet protection at the ouefalls will include inspection and repair as necessary. Additional BMPs include the following. BMP T5.13 —Post Construction Soil Quality and Depth BMP C120 - Temporary and Permanent Seeding 4.4. MINIMUM REQUIREMENT #4—PRESERVATION OF NATURAL DRAINAGE SYSTEMS AND OUTFALLS Per sections 8.1, 8.2, and 8.3 of Wakifivea Plare Cenand dPPQ Plate 2 and — Hydrokgir and Hydmuk'c Report (2017 —POE HH Report) 4.5. MINIMUM REQUIREMENT#S—ON-SITE STORMWATER MANAGEMENT Not applicable, the project site sedl collect and convey all surface water prior to directly discharging into the Snohomish River. No Flooding or erosion impacts and anticipated. 4.6. MINIMUM REQUIREMENT #6— RUNOFF TREATMENT The water quality design treatment level, volume and flowrate have been designed per Section 2.5.6 of the 2014 SWbN1W W as presented in Section 8.5 of Watecont Plea Central (WPC) Phan 2 and 3— Hydrohgir and Hydowle Report (2017 —POE HH Report). The stormwater treatment provided is in compliance with the current 2019 SWM]ifWlYt. 4.7. MINIMUM REQUIREMENT #7—FLOW CONTROL Flow control is not required as all surface inner generated on the developed project will discharge directly into the Snohomish River. 4.8. MINIMUM REQUIREMENT # & WETLANDS PROTECTION Not Applicable. 4.9. MINIMUM REQUIREMENT # 9— OPERATION AND MAINTENANCE Per section 8.8 of the Wakrfioat Place Cenral (WPCJ Plare 2 "it 3— Hydrotagis and Hydrusels ROW (2017— POE HH Report) and as summarized below: Stonnwasr treatment facility maintenance will include: • Proper disposal of any standing water removed during maintenance operations. Prior to any discharge to a actuary sewer the City of Everett will be contacted for approval. Any residuals will be disposed of in accordance with current Snohomish County Health Department and Department of Ecology requirements. • Runoff control facilities (mduding catch basins and associated structures) shall be inspected annually, at a minimum. • Catch basins shall be cleaned if the depth of deposits is equal an or greater than 1 /3 the depth from the basin to the invert of the lowest pipe into or out of the basin. • Stromwater Treatment vaults shall be inspected according to the manufacturces recommendation. Treatment medium shall be cleaned and replaced per manufacturer's recommendations. m®�® 3