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' Hennepin Pazks <br /> Project BABX-91-589 <br /> December 19, 1991 <br /> ' Page 7 <br /> ' <br /> ' C.S. <br /> b Design Sections: We have assumed only light car traffic with no heavy trucks to be <br /> ' using these pazking and drive areas. For the above subgrade and the assumed traffic, we <br /> recommend a minimum of 2 inches of Mn/DOT 2341 wear over 8 inches of crushed <br /> aggregate base. <br /> ' <br /> ' D. Construction <br /> D.1 Excavation <br /> ' Because of the potential for high groundwater, it is our opinion the soils near the bottom of . <br /> any excavation may not be able to support rubber-tired equipment. We therefore recommend <br /> that low ground pressure tracked equipment or a backhoe be used to perform the needed <br /> ' excavations. <br /> , D.2 Observations � <br /> We recommend that all excavation, footing, slab and pavement subgrades be observed by a <br /> , geotechnical engineer to evaluate if the subgrade soils are similar to those encountered by the � <br /> borings, adequate to support the proposed construction and adequately oversized. These <br /> observations should be conducted prior to placing backfills, fills or forms for footings. <br /> , <br /> After excavating for footings, we recommend that tests be conducterl on the subgrades to <br /> , evaluate if tl��e bearin; capacity is at least 2,000 psf. Typical instruments useci for ttiese tests <br /> include hand au;ers, penetrometers and sample tubes. <br /> ' D.3 BackfilLs and Fills <br /> Site soils which will be excavated and potentially reused as backfill and general site fill appear <br /> ' to be wet of the optimum moisture content. We anticipate it wilt be necessary to dry these• <br /> soils to achieve the recommended compaction. We recommend the fill and backfill be placed <br /> in lifts not exceeding 8 to 12 inches, depending upon the size of the compactor and material <br /> ' , used. <br /> � <br /> ' <br /> ' <br />