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. y <br /> i n <br />' <br />' - '..:•.:+-er� <br /> � P m Report <br /> �' Cronin Cusrom Homcs <br /> H <br /> c H � luly 31, 1990 f <br /> � H tn p��� ' : <br /> .+ � x <br /> � H � <br /> � y � uidelines to maintain slopa stability. ( <br /> ° ,x, .°u 2. Provide evaluation of the slope stabiliry and general g ; <br /> N H � <br /> M o � 4, Provida a written report oudining my conclusions and recommendations. <br /> H O <br /> O t+ <br /> H [q O <br /> H � � SITE CONDITIONS ' <br /> z y � � <br /> � ir y <br /> °o �' � The westem hillside slopes modua[ely to sreeply up from the si[e. The grades of[hz slope are <br /> � ro � typically on die order of 2:! (horizontal:vertical). Venical slope hei;hts at this inclination varied up �o <br /> y o N 20 feet. Local slope gradients were measured as steep as 75 percent, with a total vettical height of S <br /> fzet. Vegetation an the hillside consists mainly of grass, berry vines and a few trees. One fairly lar�e <br /> evzr;rzen and one lar;e deciduous '•ze exists on cne slope. � <br /> 'llie subsudace conditions were explored at the sica by excavating 4 tzs[ pics at the base o' the <br /> western hillside. The tesc pi.s were located in the fizld by a subcontractzd ^,eo�oS�s� who maintained , <br /> datailed iogs of the explorations. The locations of the te::t pits are shown on tha Site P�an. Fia�z 1. <br /> Logs of[he test pi[s are presentzd in Fiwres 2 through 3. <br /> ;`� The subsurface conditions observed in the test pits indicat� that the core ot the hillside is � <br /> I <br /> �� composed of very dzrse ;lacial drift• Th: drift is a silty sand wich gravel that was overriddan by ice <br /> , sheats on the order ot 5(�0 feet thick. "Ihe drift is matzrial that was transported at the base of the <br /> � r•�.� ;lacier. It is differentiat;d from till in that soma sortin; indicares stream ac[ion a[ the base of the <br /> r� �lacier. The result of G7is sortin� is intermittznc sand and �ilt lenses. Oveclyin; the drift eha , <br /> �explorations encounrerzd on ihe order of t ro L� �22[ of upper soils consisting of inedium dense <br /> weathered drift and a loose deposi[ uf root m:us and ropsoiL It appeared in some loca[ions that the �; <br /> �� <br /> uppzr topsoil and highly weathzred zonz had bezn stripped orf during past grading. <br /> �YB�'� Groundwa[er was no[ observed in the test pits. The drift is fairly impzrmeable and essen[ially <br /> will not transmit ;round water zxcept in possible sand seams. Depending on the catchment area above <br /> � the slope, some perched water could esist in the upper a'eatherzd and ropsoil zone durin; the wetter <br /> ���� portions of the year. � <br /> , <br /> s-�� �, <br /> �� <br /> COiJVRLTTE GEOTE'�H:�1IC.�L LNGINEGRING <br /> I - <br />