WA ST Dept of Ecology Biosolids 9/8/2022

SSLAP – Lowell Snohomish River Road Agricultural Land ___________________________________________________________________________________ ______________________________________________________________________________________ 6 • Site Monitoring Monitoring of project operations and local environmental conditions will occur as needed. Monitoring of soil nitrate may occur to verify or refine the target application rate. Record keeping and reporting will occur as required by regulations, however, both the Federal biosolids rule, 40 CFR Part 503, and the Washington State Biosolids Management Rule, WAC 173-308, do not require routine monitoring or data reporting of soils, ground , or surface waters. In part this reflects that biosolids metal pollutant concentration limits (Table 3 of WAC 173-308-160) have been set such that biosolids concentration less than Table 3 limits should pose no significant adverse environmental risks or impacts. • Operations Monitoring The City of Everett Biosolids Program will keep records of biosolids deliveries, applications, and any operational difficulties and solutions. The Biosolids Program will utilize individual maps and application worksheets that list application rates and identify application areas, significant features, storage areas, and buffer zones. The Biosolids Program will conduct periodic visual inspections during operations. Application areas, buffer zones, road conditions, and storage areas will be checked at least once per day during application and trucking and then as applicable after application. • Environmental Monitoring Environmental monitoring is done to confirm that applications are not negatively impacting the environment as well as demonstrate positive effects, such as increased soil organic matter. Groundwater (domestic well water) No private wells exist within ¼ mile of the proposed applications Tracts . The site is within the City of Everett and private wells are not allowed within the City per city ordnance (Everett Municipal Code 14.16.020). Six groundwater wells onsite are utilized to measure and track groundwater levels (Appendix A). Application will only occur where water is not found within 3 feet of the surface. Soil Samples for all fields will be collected prior and post biosolids application (background) to assess existing soil conditions and develop application rates for the next growing season. Soil sampling will be completed for applicable parameters such as ammonia/ammonium, Nitrate, and TKN. Vegetation response Monitored under the City’s Biosolids Program and our contractor, Sno-Valley Farms, to determine growth response. Additional analysis and observations may be noted. • Seasonal and daily timing of applications