2222 EVERETT AVE 2016-01-01 MF Import

encountercd till niaterials oecrlying natural deposits consisting of very stiff glaciolacustrine � sedimen[s. "Che following section presents more detailed subsurface information organized from the upper (youngest) to the lower (oldest) material and sediment rypes. Fill Fill soils were encountered in cach of the three additional exploration pits excavatcd at the site. The fill was beavecn 7 to 9 feet deep. Generally, the fill was loosc, moist to wet, gray sandy silt to silry sand �vith tracc to litdc gravel, cobblc, brick, and wood dcbris. Glaciolacustrine Below the fill, a mcJium �ensc sand to silty sand and very stiff silt to sandy silt deposit was encountered. This glaciolacustrine deposit was encountered below the fill soil in each of the three additional exploration pits completed for this study. The in situ glaciolacustrine soil is well suited for die support of thc anticipated structure. The proposed augercast piles will be embedded �vithin this soil unit. Hydrology Ground water seepage was not encountered in any of the additional explora[ion pits excavated for this study. Flowever, slight seepage was encountered in exploration pit :F-1 at approximately 9 fect bclow the surface during our previous field study. The ground water � encountered probably indicated a perched condition. The perched water occurs when surface water infiltrates down through relatively permeable soils (fill) and becomes trapped or perd�ed atop a comparativcly impernreable barrier such as the underlying in situ glaciolacustrinc deposit. During the wetter winter and early spring months, ground water levels will likely risc above the current Icvcl. It should be noted that fluctuations in die levcl of �he ground water might also occur at any time of the year and due to variations in rainfa(I, irrigation, and stream levels. DESIGN 12�C0�f�41:NDATIONS The adjacent restaurant to the east is sensitive to construction-related vibrations such as those produced during pile driving or vibratory compaction of 611 soils. The foundation for this building is also very shallow (18 inches in EP-10) and founded on similar fill soils as those encountered on the subject site. We have been asked by the architect to provide non-vibration intensive recommendations for tlie new construction. As such, wc recommended using augercast piles to support portions of the new building adjacent to the vibration-sensitive structure. The remaindcr of the building can be supported on conventional foundations beazing on the very stiff silt or on structural fill pfaced above these materials. Specific recommendations for these foundation support options were presented in our May 2001 report and have not been repeated in Qiis addendum. I 3 V