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�+1/o2i2oo� �,n:�s �,�s2�.»3s� �a•�arrorn ov��nw7 rn Pnae 1e <br /> GEOTECHNICAL ENGINEERING STUbY <br /> Panattoni Development Company, LLC E-10134-t <br /> Octobcr 2, 2002 Page 1 i <br /> [xistinc� utility pipes to be ab�ndoned should be plur�ged or removed so that they do <br /> not provide a conduit for water and cause soil snturation and sto6ility problems. <br /> A typical trench backtill section and compaction requirements for load supporting and <br /> non-load supporting areas are presented on Piate G. <br /> Pavement Arens <br /> Tho adr.quncy oi site pavomants is reletod in pnn ta the condition of the underlyin� <br /> sub�rade. 7u provide a properly prepared subgrade (or pavements, [he s�bprode <br /> shoutd be treated and prepared as described in the Site Preparation section of this <br /> report. This means at least the top twelve (721 inches of the subqrade should be <br /> r.ompnctad to 95 percent of the maximum dry density (per ASTM D-1557-91). It is <br /> �� pussible that somc localized nreas of soft, �•ret or unstoblo su6r�rade may still exist <br /> nfrer this process. 7herefore, a greater thickness of structural fill or crushed rock mey <br /> �e needed to stebilize tliese localized areas. <br /> The following pavemont section tor li�htly-loaded areas can be used: <br /> • Two inches of asphalt concrece IAC) over four inches oi crushed �ock base <br /> (CHB) materiai, or <br /> • Two inches o( AC ovr.r threc inr,hus o1 asphnh treated base fAT61 ma[erial. <br /> - [CI can assist in developinp nppropriete pavernent sections for heavy lraffic zones, if <br /> neoded. <br /> " Pavt�ment materials shouid conform to WSDOT spacificx�ions. The use of a Class B <br /> asphalt mix is suggEsted. <br /> �� LIMITATIONS <br /> i <br /> Our recommendations and conclusions are based on the site materials observed, <br /> selective laborarory testing nnd enpineering analyses, the desi�n intormation provided <br /> us end our experience and enpinoarinp judgment. The conclusions and <br /> recommondetions are professional opinians derived in a menner consistent with thot <br /> level of carc and skill ordinarily exercised by other members a( the profession currently <br /> practicin� under similar conditions in this area. No worronty is expressed or implied. <br /> fanh Cunewmn:z Inc. <br />