10200 25TH AVE SE Geotech Report 2018-01-02 MF Import

-� �- Proposed Modemization and Additions ro S��bsurjace Esploration, Geologic Hazards, Eisenhower Middle School and Geotechnica!Engineering Report Everett, WashinRton DesiRn Recommendations Anticipated ;ettlernent of footings founded as described above should be on the order of 3s inch or ]ess. However, ��. ^•rbed soil not removed from footing excavations prior to footing placement could result in increased settlements. All footing areas should be inspected by AESI , prior to placing concrete to verify that the design bearing capacity of the soils has been attained and that construction conforms to the recommendations contained in this report. The I governing municipality may require such inspections. Perimeter footing drains should be i provided as discussed underthe section on Drainage Considerations. I 10.2 Small-Dia�neter Driven Pipe Piles A deep foundation system consisting of driven, small-diameter pipe piles may be used for foundation and slab support. Galvanized pipe is recommended. The small-diameter pipe piles should be driven to refusal, which is defined as less than 1 inch of penetration during a specified period of continuous driving using a perc��ssion hammer delivering hammer energies at or above the minimum values specified below in Table 1. Because the thickness of the existing loose soil beneath the site varies, pile embedment depths will also vary and should be determined in the field by the geotechnical engineer or his representative, who can interpret and collect the pile installation data and examine the contractor's operations. AESI, acting as the owner's field representative, would determine the required pile lengths and keep records of pertinent installation da[a. Pipe pile foundation design parameters are provided in Table I. Table 1 Pipe Pile Design Parameters Nominal Yipe Wall Hammer I Allowable Vertical Driving Time Diame.er Thickness' Euergy Pile Capacitv Seconds Per Inch 3 inches Schedule 40 650 Ibs 10 kips 14 - 16 4 inches Schedule 40 850 lbs 20 kips 14 - 16 'Galvanized pipe is recommended for corrosion resistance. No lareral capacity would be provided by vertically instatled, small-diameter pipe piles. Lateral capaciry for pipe pi�e-suppor[ed strucmres could be achieved by installation of batter piles. Alternatively, passive soil resistance equal to 200 pounds per cubic foot (pc� (equivalent fluid) acting against the embedded portions of the pile caps and grade b�ams may be used. A s[ruc[ural engineer should determine the number and spacing of piles required. We recomrnend that a minimum of two uf the pipe piles be lo d tesred in accordance with the procedure outlined belo�v. Load testirg of additionat pipe pile� may be recommended for any piling where installation procedures are substandard, �r if the inregrity of the piling is January'9. ZL1'7d ,ISSOi':.ITED£ARTH SClENC£S, /NC. .41Lfd-d'EOt;Jy.�J-Pro�t��s�JGVJiJ3�AEIlYP-157A P?ae 15 � �i . V