2201 EVERETT AVE SEPA 018 - 008 Drainage Report 2025-04-15

1 SWPPP NARRATIVE See attached Drainage, C-SWPPP and Site Plan as prepared by BRL Services LLC dated 6/1/18 The project is for the construction of a three-story mini storage building on a 0.78-acre site. Less than 1 acer of land disturbance will be required for this development. Existing structures will be removed from site. The soils found onsite are Alderwood- Urban land complex. The following is a breakdown of pervious and impervious surfaces: Site Area =34,718 sf =0.78 ac (no ex.pervious surface) Existing Building = 17,479 sf =0.40 ac New Building = 18,500 sf =0.43 ac Frontage Landscape = 2,963 sf =0.07 ac(new pervious surface) Parking& Driveway = 13,255 sf =0.21 ac R/W to Ex Flow Line = 8,168 sf =0.19 ac (no ex.pervious surface) Right of Way Landscaping = 3,019 sf =0.07 ac (new pervious surface) Pre and Post Basin Area =0.97 ac Minimum Requirement#2: Construction Stormwater Pollution Prevention For additional information see the SWPPP prepared for the Washington State Department of Ecology Prepared by BRL Services LLC Brian R Lindsay(CESCL) dated 6/4/18. C- SWPPs Elements#1-13 are required. 1. Clearing limits will be marked with high visibility fence; 2. Construction entrance will utilize the existing driveway accesses. 3. There is a minor potential for soil erosion since the adjacent property is downstream of the site. The intent is to install a silt-fencing and provide ground cover for all denuded areas. 4. Sediment controls will be shown on the plan and consists of the gravel construction driveway entrance,silt fences and replanting grass/lawn on all disturbed areas and CB protection to structures downstream of site entrances. 5. Soil stabilization notes will be added to the plans; 6. The site has minor slopes to protect. The intent is to install a silt-fencing and provide ground cover and or temporary plastic sheeting for all stockpile areas. 7. See#4 above;