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January 3, 2025 <br />HWA Project No. 2021-159-21 <br />Geotechnical Engineering Report 33 HWA GEOSCIENCES INC. <br />Port Gardner Storage Facility <br />Area - Structure <br />Pile Cap <br />Elevation <br />(feet)1 <br />Tip <br />Elevation <br />(feet)1 <br />Pile <br />Length <br />(feet) <br />Pile <br />Diameter <br />(inches)3 <br />Down Drag <br />Loading <br />(kips)4 <br />Seismic <br />Area 60 – CSVT 60-01 -1 -76 75 18 190 <br />Area 70 – First Floor <br />OMES Generator 14 -25 39 18 40 <br />Notes: <br />1 Pile cap and pile tip elevations are approximate. Final pile tip elevations shall be determined by the <br />contractor. <br />2 Contractor pile installation techniques and sequencing were not known at the time of this report; therefore, <br />HWA conservatively ignored pile capacity contribution between approximate elevations 12 feet and -7 feet. <br />3Pile diameter corresponds to pile type (e.g., piles shall be 8-inch-diameter micropiles or 18-inch-diameter <br />concrete-filled driven piles). <br />4For the 8-inch-diameter micropiles, the down drag loading assumes uncased micropiles and residual shear <br />strength of liquefiable soils. Downdrag values can be reduced for micropiles cased in liquefaction zone. <br /> <br />Down drag can also occur if structural fill is utilized to raise site grades after pile installation, as <br />soils around the piles could be susceptible to consolidation settlements. However, HWA <br />understands that the proposed improvements do not include significant increases in grade. <br />4.6.3 Uplift Capacity <br />For static loading conditions, the uplift capacity of a single pile can be taken as the skin friction <br />capacity taken along the entire length of the pile and the weight of the piles. For seismic loading <br />conditions, the uplift capacity of a single pile can be taken as the skin friction capacity developed <br />below the lowest liquefiable layer and the weight of the pile. A summary of ultimate uplift <br />capacity for all proposed pile-supported areas and respective structures is presented in Table 4.