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1 <br />' <br />July 30, 1997 <br />HWA Project No. 96028 <br />4.3 Str�s�scs Cormrrtorrs <br />1.3.1 SoW <br />' Based on the subsurface conditiona observed in our expbcatory bo�ings, the ProJxt site <br />+PP� to be undaiein by a sequence of undocumented Sll and eadu�ine deposita <br />ovedyinB glaci�l driR. Dacriptiona of the units observed in our explorations are <br />' presented below in order of depositioq beginning with the most reca�dY deposited. The <br />generalized depth ranges given are for deuxiptive pwposes unly and may nnt reprexat <br />' actual wbsurface conditions at s given location. The attached summary logs �gures A 2 <br />through A-5) provide more detail rolnGve to soil conditions observed at apxific locationa <br />and depths. <br />' <br />, <br />i� <br />' <br />' <br />, <br />' <br />� <br />, <br />' <br />' <br />' <br />Undocumemed Fill - Undocumemed and/or hydrauGc Sll was obsaved in <br />both of ow exploradons, ather at t6e ground wrface or dircctly unda a <br />pavement section. The undocumeMed fill obsaved in o�r explorations <br />extended to deptlu ranging from about 13 to 13'f, fat bdow the adstiog <br />ground surfaa. Whero encountered, the undoaimented SII wes obsaved <br />direc+�y over either estuarine deposits or glacaal drift. The composition of tLe <br />fill observed in our exploradons varied with depth and location, but ga�aally <br />included medium dense to ioose, well graded sand with silt and some asplult <br />tubble; looae, poody graded sand with ailt and tnce cobbles; and loo�e w <br />very loose, silty sand with some organics (wood). <br />Estuarine Deoosits - Estuarine deposits were obsuved direcdy under t6e <br />undocumented fill in boring BH-2. At this loca6oq the dNacine depo� <br />extended to a depth of about 23 feet below the existing ground siufice, aad <br />were observed directly over glacial drift. The upper 5'h feet of the eat�atine <br />deposits generally consisted of very soR, eiastic silt with some organics <br />(wood); the low�r 4'/a feet oFthe deposit consisted of very loose, silty suid. <br />Glacial Drift - Glacial drift was observed in both ot'our explorarions directly <br />under either undocumented fill or estuarine deposits. Where encountaed, the <br />glacial drift generally con.�isted of inedium dense to very dense, interbedded <br />silty sand and poorly graded sand with varying amounts of sitt. The uppa <br />limits of this unit ranged from about 13'h to 23 feet below the �xisting ground <br />surface. The glacial drift unit was not fiilly penetrated and extended to the full <br />depth of our explorations. <br />' 96028RF.DOC <br />G] <br />Ha+o Wesr � Asaacu�res. Wc. <br />