2514 RAINIER AVE Geotech Report 2022-10-25

amec 411, t foster wheeler "clean" fill, which refers to soils that have a fines content of 5 percent or less (by weight) based on the soil fraction passing the U.S. No. 4 sieve. Import Fill and Wet Weather Fill Considerations: As discussed in Section 4.1 (Site Preparation—On- site Soils), the on-site soils would be difficult to reuse as structural fill during wet weather because of high silt content and moisture sensitivity.Alternatively, we recommend using a well-graded sand and gravel, such as "Ballast" or"Gravel Borrow" per WSDOT Standard Specification 9-03.9(1) and 9- 03.14, respectively, except that the percent passing the U.S. No. 200 sieve should be less than 5 percent. Concrete and Pavement Recycling: It is anticipated that the project will produce asphalt and concrete rubble. These materials, or similar imported materials, can be considered for reuse during project construction if they are pulverized to appropriate grain sizes. Recycled asphalt can be uniformly blended with base course materials in accordance with WSDOT Standard Specification 9-03.21(1)E and used below asphalt pavements. Recycled concrete can be substituted for up to 100 percent of base course materials, including crushed surfacing base course and gravel base, as well as gravel borrow for use as structural fill. Recycled concrete should be used in accordance with WSDOT 1 Standard Specification 9-03.21(1) B. 5.0 RECOMMENDED ADDITIONAL SERVICES ' The future performance and integrity of the structural elements will depend largely on proper site preparation, drainage, fill placement, and construction procedures. Therefore, monitoring and testing ' by experienced geotechnical personnel should be considered an integral part of the construction process. Consequently, we recommend the following additional geotechnical engineering services: 1. Review the final plans and specifications to verify that the geotechnical engineering recommendations have been incorporated properly. 2. Attend a pre-construction conference with the design team and contractor to discuss important geotechnical-related construction issues. 3. Observe all exposed subgrades after completion of stripping and any unforeseen overexcavations to confirm that suitable soil conditions have been reached and to determine appropriate subgrade compaction methods. 4. Monitor the placement of all structural fill and test the compaction of structural fill soils to verify their conformance with the construction specifications. 5. Check all completed subgrades for footings and slab-on-grade floors before concrete is poured to verify their bearing capacity. Amec Foster Wheeler Project No.6-917-18116-0 21 \\Sea-fs1\WordProc\_Projects\18000s\18116 Everett School District\Geotech Report\Revised\2017_10-19_Everett Middle School Geotech_Sx.docx