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GEOTECHNICAL ENGINEERING STUDY <br /> Costco Wholesale <br /> c/o Barghausen Consulting Engineers E-8556 <br /> January 13, 1999 Page 4 <br /> The construction of temporary slope. or the use of shoring will be necessary for the proposed <br /> underground storage tank excavatio��s. Temporary slope recommendations are provided in <br /> the "Slopes and Excavations" section of the report. <br /> Odors or other indications of contaminated soii were not encountered during our field <br /> explorations. Specific recommendaticns to mitigate the presence of contarciinated soil can <br /> only be provided once the presence and concentration of contaminants, if present, are <br /> confirmed. <br /> This report has been prepared for specific application to this project only and in a manner <br /> consistent with that level of care and skill ordinarily exercised by other members of the <br /> profession currently practicing under similar conditions in this area for the exclusive use of <br /> Costco Wholesale and their representatives. No other warranty, expressed or implied, is <br /> made. We recommend that this report, in its entirety, be included in the project contract <br /> documents for the information of the contractor. <br /> Site Preoaration and General Earthwerk <br /> The proposed development areas of the site should be stripped and cleared of the existing <br /> asphalt pavement and landscaping. We understand the existing pavement and landscaping <br /> adjacent to the development areas will remain. Existing utility lines to be abandoned should <br /> be removed or plugged so they do not provide a conduit for water. Stripped materials should <br /> be removed from the site. <br /> A representative of ECI should observe the ground surface where structurai fill or foundations <br /> are to be placed. Loose or unstable subgrade soils should be compacted or replaced with <br /> structural fill. The use of cement kiln dust ca� also be considered for stabilizing soils with <br /> over optimum muisture contents. ECI should also observe the underground storage tank <br /> excavations to verify soil conditions are as anticipated. <br /> Earth Consultnnts. Inc. <br /> lo <br />