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KLE/NFELOER <br /> �Bright People.Right Solutions. <br /> 5.8.2 Pavement Sections <br /> The results of laboratory tests completed for previous studies in the project area indicate that the <br /> near surface native "fat" and "lean" clay (medium to highly plastic) subgrade soil should exhibit <br /> poor support characteristics for pavements as represented by an R-value typically in the range of <br /> 5 or less. Pavement sections (determined in units of inches rounded up to the nearest 1/2-inch) <br /> are presented below based on R-values of 5, current Caltrans design procedures, TI's ranging <br /> from 5 to 9, and our assumption that Caltrans construction tolerances are acceptable. The <br /> pavement sections include a Gravel Equivalent Safety Factor of 0.20 per Caltrans highway design <br /> criteria. The project owner and/or civil engineer should review the pavement sections and <br /> evaluate the suitable TI's for this project3. <br /> Table 5-4 <br /> Asphalt Concrete Pavement Sections <br /> Traffic Index Assumed R-Value Asphalt Concrete Class 2 Aggregate Base <br /> inches inches <br /> 5 5 31/2 9 <br /> 6 5 31/2 13 <br /> 7 5 4 151/2 <br /> 8 5 5 171/2 <br /> 9 5 51/2 201/2 <br /> The following lime-treated pavement sections are based on our experience and laboratory testing. <br /> Historically in the project area, we've found it's more economical to increase the lime treated <br /> subgrade section thickness and reduce the overall pavement section (asphalt concrete and <br /> aggregate base) thickness. <br /> • A minimum lime-treated soil compressive strength of 200 psi. <br /> • Gravel equivalency factor for the cement or lime-treated soil of 1.1. <br /> • Minimum depth of lime-treated soil will be 12 inches. <br /> • Maximum depth of lime-treated soil will be 18 inches. <br /> It is typically difficult to achieve the required minimum compaction near the bottom of thick, lime- <br /> treated sections. Furthermore, the native soils underlying the lime-treated section are not <br /> compacted. To compensate for these factors, 3 inches of lime-treated soil has been added to the <br /> 'The traffic index(TI) is a measure of traffic wheel loading frequency and intensity of anticipated traffic. For comparison, TI's of <br /> between 4 and 5 are often suitable for design of automobile parking areas,TI's of between 5 and 6 are commonly used for <br /> design of fire truck access lanes and areas subject to channelized flow with light delivery trucks,and TI's greater than 6 are <br /> common for design of pavements supporting light to moderate bus and truck traffic. <br /> 20210067.001A/ST020R111447 Page 27 of 37 May 11, 2020 <br /> ©2020 Kleinfelder www.kleinfelder.com <br />