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GEOTECHNICAL ENGINEERING STUDY <br /> Costco Wholesale <br /> c/o Barghausen Consulting Engineers E-8556 <br /> January 13, 1999 Page 12 <br /> Asphalt concrete (AC1, aspnalt-treated base (ATB), and crushed rock base (CRB) materials <br /> should conform to WSDOT specifications. Rock base should be compacted to at least 95 <br /> percent of the AS7M D-1557 laboratory test stanilard. <br /> LIMITATIONS <br /> Qur recommendations and conclusions are based on the site materials observed, selective <br /> laboratory testing and engineering anaiyses, the design information provided to us by you, and <br /> our experience and engineering judgement. The conclusions and recommendations are <br /> professional opinions derived in a manner consistent with that level of care and skill ordinarily <br /> exercised by other members of the profession currently practicing under similar conditions in <br /> this area. No warranty is expressed or implied. <br /> The recommendations submitted in this report are based upon the data obtained from the <br /> exploratory borings. Soil and groundv �ter conditions between borings may vary from those <br /> encountered. The nature and extent of variations between our exploratory locations may not <br /> become evident until construct�on. If variations do appear, ECI should be requested to <br /> reevaluate the recommendations of this report and to modify or verify them in writing prior <br /> to proceedinc� with the construction. <br /> Additional Services <br /> We recommend that ECI be retained to perform a general review of the final design and <br /> specifications to verify that the earthwurk and foundation recommendations have been <br /> properly interpreted and implemented in the design and in the construction specifications. <br /> We also recommend that ECI be retained to provide geotechnical services during r.onstruction. <br /> This is to observe compliance with the design concepts, specifications or recommendations <br /> and to allow design changes in the event subsurface conditions differ from tt�ose anticipated <br /> prior to the start of construction. We do not accept responsibility for the performance of the <br /> foundation or earthwork unless we ara retained to review the construction drawings and <br /> specifications, and to provide construction observation and testing. <br /> Ear�h Cansultonts, nc '�, <br /> I� <br />