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Dccemhcr 15. 1992 :l _ 92,9-1184 <br />3.2 Sitc Reconnaissancc <br />A site reconnaissarue was perfonncd by our engincer during the (ield rxploration program <br />conducled on November 25, 1992. The reconnaissance provided lopographic and geomo�phic <br />infonnation indicating Ihat lhe site has remoined substantially unchanged since our previous <br />investigalion in 1987. We undersland poriion of Ihe sile was used as a construclion lay-down <br />arca in ]990 for thc developmenl of thc adjacent properly to ihc north of Silver I.ake Itoad. <br />As a resull of lhis operalion, u,�« �x��5 ,�o r�o� W��i� 5�r�n or ,Sri„u r����»��,� �x��„a;,,s <br />south of Silver lake Road approximalcly 230 tecL Adjacenl lo lhe easl side of the paved arca <br />there are hvo porlable construclion slore�e sheds and an abandoned car. <br />4. SUIISUItPACG CONDI7'IONS <br />9.l Soils <br />13ascd on llic soil conriiliats encounlcred in our Icsl �iils and informalion from the previous <br />explonlions, thc majo�ily of lhc sile appears lo bc gencrally underlain by loose fills which <br />typically overly soft pcal ovcrlyin� dense nalive till or oulwash. During our 1987 <br />invesligalion, randotn dep�cils o( so(t, clayey silt tverc also observed within lhe cenlral <br />porlion of the sitc. 7'I�c highc; clevalions of Ihe ridgc localed alon� lhe west sidc of Ihe silc <br />and a localized area along Ihe easl-center ed�e of the pro� �rly aE•pcar lo be underlain by <br />compacl, nalive wealhered lill overlying dense lill. Cenerally, the soil wiils encountered in <br />our lesl pils consisled o( Ihe following: <br />Pill - Nonslructural fill tvas encowitercd Ihroughoul Ihe site wilh the exception <br />of the ridge area localed along Ihe weslern boundary and a localized area <br />located in lhe east-ceMnl porlion of Ihe sile. The composilion and density of. <br />Ihe fill varied considerably bul generally consisled of loose to compact, dark <br />ycllu�vish brown lo tnodcrale brown and medium groy to light olivc gi;�y, finc <br />lo mediinn sand wilh some sill, lillle gravr.l and a lracc of debris. 'I'he grey <br />colorcd fills appear lo bc rcworked lill. ln Icst pils TP-G and TP-9, satvdust was <br />encounlcred aI dcplhs o( �.0 l0 5.0 fccl and 1.2 to 2.1 fcel, respeclivcly. 7'hc <br />(ill encountcred ranged in Ihickness from 2.1 fccl in 7'P-9 l0 8.9 fecl in 'I'P•G. <br />"I'est pits excavaled on Ihc rid�c luc�lcd along lhc wesl porlion of thc properly <br />did not encounler si�nificanl drposils o( (ill. liowever, conversalions wilh <br />odjacenl residenls indicale Ihc potenlial for decp fills in Ihc general arca o( Ihc <br />house and yard. During our recent exploralion, (ills were encounlered l0 8.9 <br />feet tvilhin Ihc easl facing slopc ncar lhc house silc. A conlour map of Ihc <br />Ihickness of lhe fill and pcal as inferreJ from Ihe explorelions is sho�vn on <br />Pigurc 2. <br />Peal - Peat tivas encounlered benealh Ihe fill Ihroughoul inuch of Ihe cenlral <br />portion o( lhe sile and mnsislcd of so(t, dusky ycllo�vish brown, silty peat with <br />a tnce lo IilUe fine to mediwn sand and organics. A sli�hl organic odor tvas <br />common lo Ihe pcat horizons. Thc pcal extended lo a maximwn deplh o( 10.8 <br />Goldcr Associates <br />