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

Harmon 8 Associates W-4545 ti 15 April 1985 Page 5 southwest building. experience ongoing Steeper yradients movements. . Utilities constructed above the peat. if left in piace. may settlement due to the organic nature of the peat soils. nay be appropriate to accomr.iodate these potential future Moreover. excavations to remove the total volume of fill and peat in the southwest portion of the s�te would likely extend some distance below the yround water table. If some future settlement can"be tolerated in parking areas, and site grades are not raised significantly� the existing till and peat may be left in place� with remedial efforts as outlined subsequently. Any organic-rich•materials should be either wasted or utilized as topsoil or non- structural fill. Materials free of organics may be stockpiled for later use as struttural fill. Note that the silt-rich soils characteristic of this site are moisture-sensitiv� and may require drying to optimum moisure before use as structural fill. '- — • Following completion of all earth removal the site should be prerolled with a vibratory compactor. Any wet. yielding, or pumping areas should be excavated and backfilled with a"structural fili" as outlined in Section 5.2 of this report. .Alternatively, a nan-sensitive imported material� such as washed rock or quarry spalls, may be used in place of structural fill. Considering the moisture-sensitive nature of the site soils� care should be taken to minimize disturbance of bearing soils due to equipment or foot traffic. especialiy during wet weather conditions. Appropriate measures may include shutting down earthwork activities when the site is wet, or designating specific areas as haul-road and staging areas, and protecting these areas with quarry spalls or similar materials. 5.2 Structural Fill . All fill placed in building or pavement area should be placed in accardance with the recommendations for "structural fiil'. Prior to placement of ::tructural ljp7