WA ST Dept of Ecology Biosolids 9/8/2022

SSLAP – Lowell Snohomish River Road Agricultural Land ___________________________________________________________________________________ ______________________________________________________________________________________ 3 Site Description • Location The application site is located within the City of Everett and lies within Water Resources Inventory Area 7. The land is zoned agricultural and Incorporated City of Everett by the Snohomish County Planning Department. • Topography and Geology This project is located in an alluvial plain with slopes ranging from 0 to 2%. Elevation above mean sea level is between 5 to 12 feet. • Soils The Soil Conservation Service has mapped the soils in the project area as predominately Puget silty clay loam (Appendix A). Permeability of this soil is slow with a seasonal water table of 24 to 48 inches below grade. • Climate The project lies in the Puget Sound lowlands region as classified by the National Oceanic and Atmospheric Administration (NOAA). The climate in this region consists of dry summers and wet mild winters. Maritime air masses originating over the Pacific Ocean are responsible for moderate temperatures year-round. The dry season extends from May to mid-October which is characterized by prevailing westerly and northwesterly air flows. Daytime temperatures are normally in the low 70s with the maximum around 85° F to 90° F, and a diurnal temperature variation of approximately 20° F. Only one quarter of the average annual precipitation falls in the six months from April through September. The wet season begins in mid-October and peaks in mid-winter. Nearly half of the annual precipitation occurs in the four months from October through January. Prevailing airflow is from the southwest and the west during this period. Overcast cloudy skies with frequent low intensity precipitation are prevalent as a succession of Pacific storms moves into the region. Normal winter temperatures range from 35-40° F in the day and 28-35° F at night. This marine dominated cycle is broken each winter by outbreaks of cold dry arctic or continental air masses. This condition is often characterized by initial snowfall followed by strong dry northeasterly winds, clear skies, and temperatures ranging from 10-32° F. • Vegetation The project lies within the Puget Trough physiographic province. Vegetation consists of crops of blueberries, corn, grain, grass, as well as a small area of poplar trees.