10200 19TH AVE SE COSTCO FUEL STATION Geotech Report 2022-10-25

3EOTECHNICAL ENGINEERING STUDY =ostco Wholesale c/o Barghausen Consulting Engineers E-8556 January 13, 1999 Page 12 Asphalt concrete (AC), asphalt-treated base (ATB), and crushed rock base (CRB) materials should conform to WSDOT specifications. Rock base should be compacted to at least 95 percent of the ASTM D-1557 laboratory test standard. LIMITATIONS Our recommendations and conclusions are based on the site materials observed, selective laboratory testing and engineering analyses, the design information provided to us by you, and our experience and engineering judgement. The conclusions and recommendations are professional opinions derived in a manner consistent with that level of care and skill ordinarily exercised by other members of the profession currently practicing under similar conditions in this area. No warranty is expressed or implied. The recommendations submitted in this report are based upon the data obtained from the exploratory borings. Soil and groundwater conditions between borings may vary from those ncountered. The nature and extent of variations between our exploratory locations may not Wecome evident until construction. If variations do appear, ECI should be requested to reevaluate the recommendations of this report and to modify or verify them in writing prior to proceeding with the construction. Additional Services We recommend that ECI be retained to perform a general review of the final design and specifications to verify that the earthwork and foundation recommendations have been properly interpreted and implemented in the design and in the construction specifications. We also recommend that ECI be retained to provide geotechnical services during construction. This is to observe compliance with the design concepts, specifications or recommendations and to allow design changes in the event subsurface conditions differ from those anticipated prior to the start of construction. We do not accept responsibility for the performance of the foundation or earthwork unless we are retained to review the construction drawings and specifications, and to provide construction observation and testing. Earth Consultants, inc.