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File: 218267 November 30, 2018 Pavement The new driveway may consist of concrete, interlocking pavers, or asphaltic concrete over Caltrans Class II aggregate base (baserock). The asphalt should have a minimum thickness of 2'/z inches. The baserock should have a minimum thickness of 6 inches, though 12 inches is preferable due to the expansive nature of the near-surface site soils. All of the baserock should attain a minimum compaction of 95 percent of its NIDD. The upper 6 inches of the soil subgrade and any fill below this layer should attain a minimum of 90 percent relative compaction. Plan Review and Construction Observations The use of the recommendations contained within this report is contingent upon our being contracted to review the plans, and to observe geotechnically relevant aspects of the construction. We should be provided with a full set of plans to review at the same time the plans are submitted to the building/planning department for review. A minimum of one working week should be provided for review of the plans. At a minimum, our observations should include: compaction testing of fills and subgrades; basement excavation; footing excavations; pier drilling; forming of the grade beams voids; slab and driveway subgrade preparation; pool excavation; installation of any drainage system (e.g. basement wall, footing, and surface), and final grading. A minimum. of 48 hours notice should be provided for all construction observations. LIMITATIONS This report has been prepared for the exclusive use of the addressee,and their architects and engineers for aiding in the design and construction of the proposed development. It is the addressee's responsibility to provide this report to the appropriate design professionals, building officials, and contractors to ensure correct implementation of the recommendations. The opinions, comments and conclusions presented in this report were based upon information derived from our field investigation and laboratory testing. Conditions between or beyond our borings may vary from those encountered. Such variations may result in changes to our recommendations and possibly variations in project costs. Should any additional information become available, or should there be changes in the proposed scope of work as outlined above,then we should be supplied with that information so as to make any necessary changes to our opinions and recommendations. Such changes may require additional investigation or analyses, and hence additional costs may be incurred. 14