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Escalon Subdivision <br /> Page 6 <br /> ►• May 30,2000 <br /> VI ASPHALT PAVEMENT RECOMMENDATIONS <br /> L <br /> Recommended pavement sections have been designed using the results of the R-value tests <br /> Land an assumed traffic index. An R-value of 38 was used for design purposes. Based on our <br /> experience with this type of project, traffic indices of 4.0 and 5.5 were used for design. If traffic <br /> indices different from these are required, please contact our office and a suitable recommended <br /> design can be provided. Flexible (asphalt) pavement sections have been design according to the <br /> latest addition of the Cal Trans Highway design manual and using a 20-year pavement life. The <br /> pavement sections are presented next. <br /> L <br /> FLEXIBLE(ASPHALT)PAVEMENT SECTION DESIGN <br /> Subgrade Traffic Traffic PavententSection,inches <br /> R-Vale Index <br /> L Asphalt Aggregate Aggregate <br /> Concrete Base Subbase <br /> L38 4.0 auto 2.0 4.0 <br /> 38 5.5 auto/truck 3.0 6.0 <br /> LThe paving materials must conform to the requirements of the State of California, <br /> Department of Transportation, Standard Specification. Type B asphaltic concrete and class 2 <br /> aggregate base should be used. <br /> L <br /> The street subgrade should be stripped of all organic matter,loose soil,etc.,and any required <br /> Lcuts made. A minimum of 6 inches of compacted subgrade should be provided beneath the <br /> pavement sections. The subgrade should be compacted to dry densities in excess of 95 percent of <br /> the maximum dry density obtainable in the ASTM D1557 Compaction Test. The subgrade should <br /> Lhave a minimum R-value of 38. <br /> L VII UTILITY CONSTRUCTION <br /> The soils encountered in the test holes are cohesionless and considered unstable. All trench <br /> L <br /> excavations should be according to Cal OSHA requirements. <br /> Backfill placed in trenches should be placed in approximately 8 inch lifts in uncompacted <br /> thickness. However, thicker lifts may be used, provided the method of compaction is approved by <br /> the soil engineer and the required minimum degree of compaction is achieved. Material should be <br /> L <br /> O <br /> 4 <br /> 1,so`,r <br /> L <br />