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. 77-413 <br />George Jackson & Assoc. -4- Au,;ust 31, 1977 <br />type can be questionable when wet and :should be more <br />thoroughly investigated at a later time. Although bower <br />auger borings do not provide information relative to the <br />strength parameters of the various soil types encountered, <br />mineral soils of the types brought to the surface by the <br />auger generally are of sufficient strength to support single <br />family dwellings without detrimental settlement. The black <br />mineral soils encountered in the majority of the borings <br />near the surface are likely quite soft and would not provide <br />an adequate foundation. These soils will likely have to be <br />removed in their entirety from the building areas prior to <br />■ construction. <br />The acceptable rate for percolation tests is 60 mpi; there- <br />fore, all of the tests conducted indicate rates of a magnitude <br />which would be considered acceptable. At the time of lot <br />development. and when drainfield locations are established, <br />it is suggested that a more thorough check of soil absorptivity <br />rates be conducted. <br />Of necessity, the area of the power auger borings and perco- <br />lation tests in relation to the areaof the sub' ,,'ision and <br />the depth of the borings are limited. Suggest.a-i:. and/or <br />recommendations of this report are opinions base.` on the <br />data obtained from the borings and percolation tr':;ts performed. <br />If we can be of further assistance in evaluating these data, <br />or in taking additional borings or percolation tests as the <br />development of the site progresses, kindly contact us at <br />your convenience. <br />Very truly yours, <br />R UN ENGINEERI G TESTING, INC. <br />qv/ <br />Dennis M. Rictschel <br />Engineering Ass'stant <br />C. G. Kruse, P.E. <br />Tice President - Engincerinri <br />01 <br />DMII/CGK: skf <br />3�rrn�.r',•1 n' In: ,' lN..1 WO %. vj...It,nq A... uminta 1•. r,_ r rt,. !• •u..:. .: a..�l ...n M• .r• .arl• :n In.. .1' .. .. r • t..: t !r• ..r <br />:r wry t <br />r y • •nl.rin.n Ilb Isau rnr r1O rh.IrUnMh.�.lt 1• .I rr. .r • •r.•.,.Ir ll�.. t WI n rr•'.Irnl 1 TV' <br />BRAU11' <br />ENGINEERING TESTING <br />