1505 SE EVERETT MALL WAY Geotech Report 2018-01-02 MF Import

C Harmon 8 Associates N-4545 , 15 April 1985 Page ts "mud-mat` a* the base oT tht footing excavation in ord;:r to minimize disturDance and s�ftening of the bearing stratum during forming and reinforcing Gar placement.. . ' 5.4 Slab-On-Grade Floor The suhyrade to support yround floor level slabs should be prepared in accordance ` with the previous site preparation recommendations. The slab-on-grade should be founded oh prerolled undisturbed native grourid or structural fill compacted to at lc�st 90 percent density (ASTM:D 1557). We recommend that the floor slab be underlain.by at least 4 inches of clean. granular material. such as sand or a sand and gravel mixture. An impervious moisture barrier may be olaced beneath 1:he concrete to act as a moisture break. The Portland Gement Association recommends proteciing the moisture barrier with a minimum 7-inch sand layer prior to placing concrete. If the' southwest building is not relocated, and some settlement of the floor slag can be tolerated, the floor slab can be constructed above a- minimum 2-tQot thickness of structural fill, placed and compacted as outlined previously. 5.5 Drainage Feundation drainage is recommended along all continuous footings. Footing drains should be located adjac�nt to the bottom of the foundation stem wall and consist of a minimum 4-inch perforated pipe enveloped with pea gravel, and tight-lined to an appropriately designed discharge. Roof and surface runoff should not be directed into the footing drains but should be disposed via a separate tight-line system. - � �-� 5.6 Pavement Subgrade' � To minimize settlement problems� pavement section shouid be placed u�on undisturbed natural glacial till or structural fill prepared as outlined in Sections 5.1 and 5.2. To conform wi:h these recommendations in the southwest side of the site would require removal of 10 feet or more of fill and peat. An alternative to removal of this unsuitable material and replacement with structural fill is to "float" the pavement iii this area. "Floating" the pavement