9205 4TH AVE W 2025-12-03 - Laserfiche WebLink

4. DEVELOPED CONDITIONS The project contains approximately 0.48 acres. There are no critical areas within the site. The project site is currently undeveloped. The site has been cleared previously and it is now overgrown with vegetation. There are existing gravel and asphalt located on the west portion of the site. All existing structures are proposed to be removed. The proposal is to construct two single-family homes and approximately 150 lineal feet of shared driveways with associated utilities. The access to the site will be from 41h Ave SP. The frontage improvements already existed on 4th Ave SP, therefore no frontage improvement is required for this project. The site contains one drainage basin that drains to the southeast portion of the project site. Per SCC survey of Snohomish County, the project site contains Alderwood soils that have a hydrologic classification of Type "C". Please refer to the soils map and descriptions attached in the appendix for more details. Individual Rain Gardens are proposed to meet the retention/water quality requirements in accordance with the city of Everett standards. SBUH methodology using "Stormshed" software by Engenious Inc. is used for the Rain Garden calculations. Rain Gardens are sized for the 100-yr/24hr-storm event. Refer to the calculations attached later in this section for more details. A design infiltration rate of 1 in/hr has been used per Geotech recommendation. Please refer to the geotechnical report attached in the appendix for more details. Water quality would be obtained by the use of the amended soil on the bottom of rain gardens. Refer to Sheet C4 of the construction plans for more details.