10008 25TH AVE SE 2016-01-01 MF Import

�. � � f. 1 Floor slab subgrades should be prepared by scarifying the soil to a depth of 12 inches, moisture- conditioning to near optimum moisture content, and recompacting in accordance with Section 33 of this 1 repoR. If additional fill is needed to support floor slabs, it should consist of structural fill placed and comparted in accordance with the recommendations in Section 33. Exterior grade bac�ll should also � � consist of swctural fill, placed and compacted in accordance with the recommendations contained iR S�xtion 3.3 of this repoct. In improved azeas (beneath structures, pavement and floor slabs),utility uerch Iba:kfill should consist of structural fill placed and compacted in ace:ordance with the recommendations contained in Section 33. -1 �!� 3.3 STRUCTURAL FILL � For dry weather conditions, suuctur,.l fill should consist of a g:anulaz material, free of trash, wood waste or other deleterious material. The maximum particle size should not exceed 4 inches and the � material should contain less than 15 percent fines (material passing a U.S. No. 200 sieve). Based on the field exploraticns, the material excavated for the footings should meet the requirements for dry-weather � suvctural fill and may be reu�ed, provided the material can br. properly moistuee conditioned and compacted to the required density. Our laboratory testing indicates that the onsite soils may be wet of � � optimum,and drying of the onsite soil may be required to achieve the specified compaction. Also, most � ' of the site soil contains a signiPicant amount of silt and fine sand which will make the soil moisture sensitive. In a compacted or uncompacted stat�, the site soil will degrade quickly to a slurry-like ; consistency in the presence of water and conswction vaffic. � If the existing fill cannot be reused, or wet weather constcuction is anticipated, import suuctural � fi!l will be required. Import stcuctural fill should consist of material meeting the requirements for dry weather structural fill,but contain less than 5 percent fines based on the�/.-inch fraction. Structural fill should be placed in �elatively horizontal lifts not exceeding 8 to ]0 inches thick, loose measure, and each lift compacted to the relative density, in the table below. The mauimum dry density should be detertnined in accordance with ASTNI D1557. _� REQUIRED MINIMUM CUMPACTION ' Area Relative Compaction , Utility Trenches Same as Adjacent Area ' Under Paving,Foundations, `� and E7oor Slabs 95�/0 Behind Retaining Walls 92°b Landscape Areas 85-90% i ,.i I Y2602 1:1PR0.1ECT10110D5.01 STMONT PPT.DOC 3-2 UNDAU ASSOCIATES � \ J J