2600 FEDERAL AVE 2021 PORT OF EVERETT 2025-09-29

Substantive Requirements Review Landau Associates Areas with wood waste could experience an additional 4 to 6 inches of long-term settlement as the waste decomposes. The estimates in Table 3 do not account for the effect of fill placed during the interim action cleanup; actual settlement could vary. 3.2 Earthwork Recommendations Earthwork is expected to consist of clearing, grubbing, and stripping in areas where improvements are planned; cuts and fills in proposed pavement areas; and subgrade preparation for new pavement sections. 3.2.1 Site and Subgrade Preparation Topsoil, organic and man-made debris, and other deleterious material should be stripped from all areas of the site designated for improvement. Prior to placement of structural fill, the exposed subgrade should be compacted to a firm, unyielding condition. The upper 12 inches of subgrade should be compacted to at least 95 percent of the maximum dry density (MDD), determined in accordance with ASTM International (ASTM) standard test method D1557, Standard Test Methods for Laboratory Compaction Characteristics of Soil Using Modified Effort(56,00 ft-Ibf/ft3 (2,700 kN-m/m3)). The compacted subgrade should be proof-rolled with a loaded dump truck; a self-propelled, vibrating roller; or an equivalent piece of equipment. Proof-rolling should be performed in the presence of a qualified geotechnical professional, who is familiar with the site and can check for soft and/or disturbed areas. Areas exhibiting significant deflection, pumping, or weaving should be overexcavated to firm soil. Overexcavation of unsuitable subgrade material should be completed in accordance with the requirements in Section 2-03.3(14)E of the Washington State Department of Transportation's 2020 Standard Specifications for Road, Bridge, and Municipal Construction (2020 WSDOT Standard Specifications). Based on LAI's conversations with the design team and observations made during K-C's backfilling operations in the fourth quarter 2020, the ground surface at the site consists of sand with limited fines (material passing the U.S. Standard No. 200 sieve) that is easily disturbed when exposed to construction traffic. Placement of this material can be seen in the photograph on Figure 6, which was taken in October 2020 during K-C's backfilling operation. LAI recommends using off-road construction equipment or placing a gravel working surface in high traffic areas. The gravel working surface should consist of Select Borrow, per Section 9-03.14(2) of the 2020 WSDOT Standard Specifications. If the working surface is likely to experience heavy traffic during periods of wet weather, the fines content should be limited to 5 percent or less, by dry weight, based on the fraction passing the %-inch sieve. All fill materials, except Gravel Backfill for Pipe Zone and Bedding, should be placed and compacted in accordance with the requirements in Section 2-03.3(14)C, Method C of the 2020 WSDOT Standard Specifications. Gravel Backfill for Pipe Zone and Bedding should be placed and compacted in accordance with the recommendations in Section 3.6.3 of this report. Geotechnical Engineering Report 0121049.040.041 Norton Terminal Development&MTCA 3rd Interim Action 3-2 May 7,2021