3500 TERMINAL AVE Geotech Report 2022-10-25

Port of Everett—South Terminal Wharf& Electrical Upgrades—Phase 2 125 Table 21 — WEAP Analysis Results for APE D100-52 Hammer Allow. APE D100-42 Hammer Pile Compressive Pile Rows Diameter Max Compressive Max Blows per Resistance (in) Stress (ksi) Foot (kip) A,B,C 18 265 39.1 7 A' 24 360* 44.4 10 D,E 18 305 44.4 11_ • F,G,G' 24 660 44.7 32 *Maximum allowable compressive resistance corresponding to compressive stress less than 45 ksi(0.9*Fy)for selected hammer. Additional Considerations.The output produced by the wave equation analyses depends on the pile, hammer, and soil input parameters.We selected input parameters based nearby field explorations, laboratory tests, previous pile driving and dynamic testing,and manufacturer-supplied hammer information.Actual field conditions, project requirements, and hammer type and performance may vary from what we have assumed;therefore,the actual drivability and driving stresses may differ from those presented above. Our analyses did not include possible effects of pile installation such as interruptions to driving and subsequent pile setup. Our assessment assumed an equal distribution of the total resistance between the pile toe and shaft. Instances in which the piles are primarily end bearing may result in increased compressive stresses than our calculations predict. Given the high stresses computed for the pile loads, it is critical that field observation of the piles with the PDA occur.Additionally,the driving stresses computed by the GRLWEAP program do not include stresses that might result from bending or torsion. For best driving performance, it will be important for the contractor to adequately prepare the pile top for driving, use a pile helmet that fits the pile, and maintain the vertical alignment of the hammer, cushions, helmet, and pile. Monitoring During Pile Driving Pile driving stresses can be measured indirectly in the field using a PDA or estimated using a wave equation computer program such as WEAP. We recommend that pile installation monitoring activities include the following: • Verify adequacy of the hammer, cushion, and cap block before beginning driving with a drivability analysis completed by the Contractor and reviewed the by the Port's Geotechnical Engineer, • Ensure proper pile handling before driving, • Record the hammer operating characteristics such as fuel setting,stroke, and hammer blows per minute, • Record the hammer blows per foot of pile penetration, 1.� 19232-01 H/ARTCROwSER December 6,2017