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Revised Proposal for Geotechnical Pavement Investigation BSK Proposal GL21-21837B W. Las Positas Boulevard September 15, 2021 Pleasanton,California Page 4 be backfilled with cement grout per County requirements. Approximately 6 inches of the top of each boring will be patched with Quikrete (i.e.,fast-setting concrete). Excess soil cuttings will be collected and disposed of at a landfill facility offsite. We anticipate performing our exploration during weekdays only (Monday through Friday) between the hours of 9:00 am and 3:00 pm or as otherwise permitted per the City encroachment permit.We will retain the services of a traffic control subcontractor that will provide full traffic control services during drilling. We expect our field investigation will last eight(8) days if we mobilize one drill rig. Although this is rare, in the event that hazardous materials are encountered as indicated visually or by odor in the soil borings during our subsurface investigation, such borings will be immediately terminated and arrangements will be made to backfill such borings with cement grout. BSK will notify you as soon as possible of such an occurrence, and we will mutually decide whether to continue, modify, or cease the remainder of the investigation program. All added cost incurred as a result of suspected hazardous substances would be charged on a time and expense basis over and above the fee estimate for the geotechnical investigation using our current fee schedule. Task 3—Laboratory Testing Laboratory tests will be performed on selected soil samples to evaluate pertinent engineering properties for design of the project. Laboratory tests which we anticipate performing may include measurement of in-situ moisture content and dry density, Atterberg limits, shrink/swell, sieve analysis, R-value, consolidation, and shear strength testing. A spreadsheet showing our anticipated laboratory testing program is presented as an attachment. Note that this testing program is subject to change based on the soils and subsurface conditions we encounter during the investigation. However,this will be the basis of our actual laboratory testing program. We will temporarily store the samples collected during our investigation (but not tested in the lab) for a period of up to 180 days from the date of drilling. After this period,we will dispose of the samples unless otherwise requested by the Client. Task 4—Engineering Analysis and Draft Report Preparation We will evaluate our findings and perform geotechnical engineering analysis to develop conclusions and recommendations for the anticipated improvements. Our findings and recommendations will be summarized in a draft report prepared under the supervision of a California registered Geotechnical Engineer. At this time,we anticipate that the report will include the following items: • A description of the project including a vicinity map and site plans showing the approximate locations of our borings; • A description of the subsurface investigation, logs of borings, and results of laboratory tests; • A description of the surface (including a review of historical aerials) and subsurface site conditions encountered during our subsurface investigation, including depth of free groundwater if observed in