WA ST Dept of Ecology Biosolids 9/8/2022

SSLAP – Lowell Snohomish River Road Agricultural Land ___________________________________________________________________________________ ______________________________________________________________________________________ 5 Site Operation The following describes how biosolids are transported, stored and handled on -site, including application, buffer areas, operations and environmental monitoring, approximate application schedules, and contingency plans. • Transportation Biosolids will be transported in trucks, pups, containers, or in end dump trailers. Additional procedures for transportation are covered under the “Residuals Haul and Emergency Response Handbook” (Appendix E). • Staging and Storage Areas Staging areas are intended for short-term storage and consist of a location or locations on site where biosolids can be delivered and then loaded into application equipment. Biosolids will be off loaded onto the surface of the ground at predetermined sites on the application area of the permitted field. Centralized locations will be chosen that provide relatively convenient areas for off-loading, loading onto application equipment, close proximity to application sites, and minimal potential for environmental degradation. • Biosolids Application Methods Biosolids will be applied in semi-solid form (>28% solids) using standard agricultural equipment. Sno-Valley Farms, a private contractor with extensive experience in silviculture and agricultural applications, will apply the biosolids. Biosolids will be stockpiled on the surface of the ground, loaded into a side or rear discharge spreader, and uniformly spread over the surface of the ground before incorporation by tilling. Routine equipment maintenance and cleaning are conducted on all applications ’ related equipment. All haul vehicles and equipment will be free of loose biosolids prior to leaving application areas. Applications will be suspended if weather conditions or soil conditions make operations infeasible or unsafe. • Access Restrictions Signs surrounding the site prohibit public access to the application site at any time. • Buffers Buffers are strips of land around storage areas or application areas that are not intended to receive biosolids. Buffers are used to protect features such as surface water or wells that may be adversely impacted by nutrient laden run off water or to minimize the potential for nuisances such as odors from biosolids stockpiles. A list of buffers for a number of features is provided in Appendix D. Out of the 166 acres, approximately 124 acres can receive biosolids when taking into account the appropriate buffers. Buffer distances and locations will be identified for all significant features on each site with traffic cones, stakes with flagging, or disk implement to form rows.