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i <br /> � <br /> ����,��. ��8,�,��. � <br /> � Nousing Hupe Pharr l! Aiftmirary GerxecMnlcal Fii;inee�fng Rrport <br /> E�Yrtrt. W'athingfon Proflct and Sitt Conditiont <br /> f4.2 Hvdrologv <br /> Ground water seepagc was uot cacountered ic .3ny of c>ur explotatioa pits. However, very <br /> ( riloist to wer soils wcze cncountered immediately above or �vithin the more silty materials in all <br /> � of our ezpl'.uration pics. Perched ground water a;curs w5en vertical infiltradon of surface <br /> a:ater �x imptdrn by relatively impermeable strata and aorizonal migradoa o�.urs. The <br /> Irrcessieoal outwxsh sediments are relatively permeabla 4{nWever, the very dease silry till is <br /> virtually impermeable and ground water tends to perch i!fx;�, iit�s suata. <br /> ' The duration and quantiry of ground water fiow generally depends on several fact�rs including <br /> topogtaphy, soil grain size an�' densiry, and seasoas. Increased grour.d water flow may be <br /> � zncountered fol7owing extended periods of wet weather or in response to chan�es in site use. <br /> it may be desirable to insrall a piezometer within the azea intended for infiltration if the <br /> ' infilvation facilities will be designed at elevations deeper tl�an about 366 feet. <br /> { <br /> � <br /> � <br /> I <br /> I <br /> I � <br /> I <br />� � <br /> I <br /> I <br /> 1 <br /> � February /1, 2002 dSSOCU7EDEARTHSClENCES lNC. <br /> SGH�d.XE0!i19A2•tYo/mi17DOl7�fl�.CE�WP•W7K Page 5 <br /> � /� <br />