3301 CEDAR ST 2018-01-02 MF Import

Riringer Ruildin� Material�Testing&Comultlnq,lnc. November 3,2005 �5�.,�8 7.0 Discussion 7.1 EaNhwork Excessively orgnnic nnd loosc soils gencrnlly undergo high volume changes when subjected to luads. This is detrimental to the behavior of pavements, floor slabs, structural fills nnd foundations pinced upon them. Therefore, excessively organic nnd loose soils should be stripped from these areas and wasted or stockpiled for later use. Stripping depths will vary fmm 0.3 to 1.0 feet. Exact depths of stripping should be edjusted in the field to ensure that the entirc root or loose zone is removed. Table 2. Recommended Stripping Dcp16s Teet Plt Loeatlon Strlppinp Depth R 1 South ro comer 0.9• 2 East ro comer 0.0 to 1.0' 3 North ro �comer 0.3' Exnct depths oF stripping shoi�ld be adjustcd in thc field to ensurc that the entire root or loose zone is removcd. The final exposed subgmde should be inspected by MTC to verify thut all organic material has been rcmoved. Any sotl spots or de(lecting areas should be mmoved to firtn unyielding soils and repinced with strur.tural fill. Once the existing soils are excnvated to the design grade, proper control of the subgrade conditions (i.e., moisture content) and the placement and rnmpaction of new fill (if required) should be overseen by MTC. Thc rccommendations for structural fill prcsented in this report should be followeJ to minimize differentinl settlements that are detrimental to the behavior of fcwtings,and floor slnbs. 'Nole.• fhis investigalinn took place while Ihe sf►e was heinR stripped 7.2 Structural Fill Importcd structural fill should consist of u mixture of clean sand and gravel thet is rclatively frce of fines ns outlined in the recommendations section below. If sWetural fill is used for the support of foundations, fill quality, placement and compuction should be monitored continuously by �1TC so thnt thc work is performed in accordance with the recommendations section outlined in this report. Thc use of onsite glacial till or weathered glacinl till as structural fill is not recommended during wct wenther. 'Ihese soils are highly moisture sensitive and cannot be compacted to a dense and stable condition with �onventionnl methods if the till is exposed to rainy conditions. During fnir wcather, the native glacial soils mny be used as structural fill provided they are properly moisture conditioned, placed and compacted as discussed in the rccommendations secdon of this repoR. 7.3 Beering Capacity Two rcquircments must be fulfilled in the design of foundations. First,the load must be less than the ultimate bearing capacity of the foundation soils to maintttin stubility; and secondly, the differential settlement must not exceed an amount that will produce adverse behavior of the - 7-1 ��b