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OTTO ROSENAU & ASSOCIATES, INC. <br /> Geotechnical Engineering, Construction Inspection &Materials Testing <br /> GEOTECHNICAL INSPECTION REPORT <br /> Report Number:460442 <br /> Description: Subgrade rework <br /> Project: Boeing Side of Body Access Stands Permit Number: B2309-055 <br /> Address: Bldg 40-27 Job Number: 23-0861 <br /> Client: The Boeing Company Client Address: <br /> Inspector <br /> and Date Remarks <br /> M. Gray, <br /> Friday, December 29, 2023 <br /> Inspected the following: <br /> • Slab subgrade, interior, tunnel level, approx. grids T.6—T.7/6.57-6.9 per layout on sheet <br /> 1 S10-27 of plans, dated 03/02/2023, supplied by the contractor; excavation was approx. 5 feet <br /> below finish floor; area approx. 30X15 along the referenced grid. <br /> Description <br /> The exposed material consisted of native gravelly sandy silt, pit run, and CDF (reference ORA <br /> Geotechnical Inspection Report#460432, dated 12/23/2023. <br /> Contractor provided a plate vibrator to consolidate the disturbed material and water conditioned the <br /> grade in order to facilitate the compaction method. <br /> Summary <br /> A representative number of probe tests were taken throughout the referenced subgrade; based on <br /> maximum penetrations of 2"-3"with substantial resistance to advance into surface using full body <br /> weight, the subgrade was found to be firm & unyielding and suitable for load bearing design of approx. <br /> minimum of 3,000psf per plan. <br /> Start Time: Is this a re-inspection? ® Yes ❑ No <br /> Finish Time: Original inspection date: 12/26/23 <br /> Inspected by: Reviewed by: <br /> This report applies only to the items tested or reported and is the exclusive property of Otto Rosenau&Associates, Inc. Reproduction of this report, <br /> except in full,without written permission from our firm is strictly prohibited. <br /> Page 1 of 1 <br /> 6747 M.L. King Way S.,Seattle,Washington 98118-Phone(206)725-4600 or 1-888-OTTO-4-US-Fax(206)723-2221 <br /> Form No.:GEO-100-01 LT(Rev 01105) <br />