2030 GRAND AVE 2018-01-01 MF Import

' Su6surjace Erploration and 2026 Grand Avenue Geotechnical Engineering Report �i Everetl, INashingm�i Desi,en Recommendations ± i 9.0 FOUNDATIONS Spread footings may be used for building support when fow.led on medium dense to dense, natural sediments. It is anticipated that medium dense to dense, natural sediments will be � exposed at shallow depths (within 3 feet of floor grades) within the eastern half of the building. � ALSI should conduct a soil bearing evaluation within foundation areas. \Ue recommend that I an allowable hearing pressure of 2,500 pounds per square foot (ps� be utilized for design purposes, including both dead and live loads. An increase of one-third may be used for short- rerni wind or seismic loading. Perimeter footings should be buried at least 18 inches into the I surrounding soil for frosc protection. All footings must penetrate to the prescribed bearing stratum, and no footing should be ibunded in or above loose or organic soils. All footings should havc a minimum width of 18 inches for three-story strucmres. � It should be noted that die area bound by lines extending downward at IH:1V from any footing must no[ intersect anodier footine, or intersect a filled area that has not been compacred to at � least 95 percent of ASTi�t:D 1557. In addition, a 1.5H:1V line extending down from any footing must not daylight, because sloughing or raveling may eventually undermine the ( footing. Tlms, footings sl�ould not be placed near the edge of steps or cuts in the bearing soils. Anticipated seulement of footines founded on medium dense to dense, natural sediments, or '�^^C^�'e(� -[2'UCl�1I3I EII�, shnuld he less than �/y inch. However, disturbed soil not removed ,.,.,, ,.. � from footing excavations prior to footing placement could result in increased setdemee:s. All footing areas should be insrected by AGSI prior to placing concrete to veiify that the design �" bearing capacity of the soils I�es been attained and that construction conforms to the recommcndations conwined in this rcport. Perimeter footing drains should be provided as discussed under the <ection on Druilmge Consicteratiorts. � 9.1 Au�ercast Piles ( Cast-in-place concrete piles (augercast) arr recommended for foundation support within the western half uf die building. �Ve recommend that the placement of all piles be accomplished � by a contractor experienced in dieir installation. We estimate pile lengdis will be on the order of 20 to 30 feet widi an embedmeni of 3 feet into the bearing strata. Pile length estimares are relati��e ro existine site grades present at the time of our exploration and should be adjusted accordingly if die site is graded prior to pile installation. r�llowable design loads may be increased by one-third for short-term �vind or seismic loadine. 1 Anticipated setdenienes of aueercast pile-supportrd strucmres �eill eenerally be less than 1 inch. I I �� y �� ASSOCIATED EAR7N SG£NC£S, 1NC. � ins�a-xera,r,vc� -u>u e��e-a�-n_x Page 9