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sand with traces Of oroaaio matter to very tine Moody <br />silt. Who till depth varies iron Moro nsar the Powder <br />Rill Oahe Crook to a depth of about P to to test !a the <br />area adjacent to the driveway of the bons. The layer <br />beneath the till consists of a hard clay. <br />iubmwfoos Water cemaot PsnsWp the hard clay layer. <br />AMOUPr isstood, the Water toads is Parab as top of the <br />clay and now towards the cost. Sbsea <br />Sa�imoioWlc coaditions are extremely conducive to <br />earths !ding. tbs report oa -,am= that potential <br />contributory causes of earth wilding are as tollowan <br />I. This Placement of fill material an the property <br />eats to load the weak soils and accelerate the <br />earth movement. <br />2. The small log am in Powder Rill Ocicb Can* <br />craatea a plwge Pool downatzm n that can dsapea <br />and widen with increasing strum flown. Psrleg <br />plwge Pool formation, the hard clay layor vil <br />erode at the toe of the slope. Ths Ions of <br />material at the too of the slope reduoos <br />resisting forces, increasing the risk of <br />sliding. <br />3. This overlying silty sand layer is significantly <br />more erodible than the bard clay below, and its <br />erosion can cause more sapid earth sliding. <br />This condition can occur if peak water levels in <br />the stream emceed the elevation of the top of <br />the clay layer. <br />]. Conclusions <br />These reports cover a period of 23 years. Certain <br />aonalusions cauisteatly arise and when the reports are <br />read together, several facts are widest: <br />1. The Property has a long history of instability <br />and earth al:des caused by the existing geologic <br />and hydrogselogic conditions of the soil. <br />2. Subsurface water cannot penetrate the hard clay <br />layer underlying the Property. Sumetore, the <br />subsurface water flow downhill towards the <br />crook along the interface between the clay and <br />