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625 Cypress Avenue Geotechnical Investigation Project No. W1895-88-01 - 26 - April 23, 2024 PRELIMINARY PAVEMENT DESIGN SECTIONS Location Estimated Traffic Index (TI) Asphalt Concrete (inches) Class 2 Aggregate Base (inches) Automobile Parking and Driveways 4.0 3.0 4.0 Fire Lanes 7.0 4.0 12.0 7.9.4 Asphalt concrete should conform to Section 203-6 of the “Standard Specifications for Public Works Construction” (Green Book). Class 2 aggregate base materials should conform to Section 26-1.02A of the “Standard Specifications of the State of California, Department of Transportation” (Caltrans). The use of Crushed Miscellaneous Base (CMB) in lieu of Class 2 aggregate base is acceptable. Crushed Miscellaneous Base should conform to Section 200-2.4 of the “Standard Specifications for Public Works Construction” (Green Book). 7.9.5 Unless specifically designed and evaluated by the project structural engineer, where exterior concrete paving will be utilized for support of vehicles, it is recommended that the concrete be a minimum of 6 inches of concrete reinforced with No. 4 steel reinforcing bars placed 16 inches on center in both horizontal directions. Concrete paving supporting vehicular traffic should be underlain by a minimum of 4 inches of aggregate base and a properly compacted subgrade. The subgrade and base material should be compacted to 95 percent relative compaction as determined by ASTM Test Method D 1557 (latest edition). 7.9.6 The performance of pavements is highly dependent upon providing positive surface drainage away from the edge of pavements. Ponding of water on or adjacent to the pavement will likely result in saturation of the subgrade materials and subsequent cracking, subsidence and pavement distress. If planters are planned adjacent to paving, it is recommended that the perimeter curb be extended at least 12 inches below the bottom of the aggregate base to minimize the introduction of water beneath the paving.