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Phelan Development Holly Master Plan - Buildings H & 1 <br /> 15188.000.006 Geotechnical Exploration <br /> wall face. If heavy compaction equipment is used, the walls should be temporarily braced to avoid <br /> excessive wall movement. Lime laden fill should not be used as retaining wall backfill. <br /> 8.4 FOUNDATIONS <br /> Retaining walls may be supported on continuous footings designed in accordance with <br /> recommendations presented in Section 5.2. <br /> 9.0 PAVEMENT DESIGN <br /> 9.1 FLEXIBLE PAVEMENTS <br /> Based on our test pit explorations, we judge an R-Value of 5 be appropriate for design. Using <br /> estimated traffic indexes for various pavement loading requirements, we developed the following <br /> recommended pavement sections using Topic 633 of the Caltrans Highway Design Manual <br /> (including the asphalt factor of safety), presented in the table below. <br /> As an option, you may lime treat the pavement subgrade (minimum of 4 percent lime) in order to <br /> increase the subgrade R-Value to a minimum of 40 and reduce the overall pavement section. A <br /> minimum of the upper 12 inches of subgrade must be lime treated. We provide additional <br /> pavement sections in Table 9.1-1 below. <br /> TABLE 9.1-1: Recommended Asphalt Concrete Pavement Sections <br /> ASPHALT CONCRETE CLASS 2 AB(INCHES) <br /> TRAFFIC INDEX (INCHES) (NATIVE SUBGRADE) (12 INCHES <br /> LIME-TREATED SUBGRADE) <br /> 5 3 10 4 <br /> 6 31/2 13 4 <br /> 7 4 151/2 7 <br /> 8 5 171/2 9 <br /> 9 51/2 201/2 12 <br /> 10 7 23 12 <br /> 11 81/2 231/2 12 <br /> 12 101/2 241/2 12 <br /> The civil engineer should determine the appropriate traffic indexes based on the estimated traffic <br /> loads and frequencies. <br /> 9.1 RIGID PAVEMENTS <br /> We developed the rigid Portland Cement Concrete Pavement (PCCP) pavement section in <br /> accordance with the methods contained in the Thickness Design for Highway and Street <br /> Pavements Manual by the Portland Cement Association. <br /> Table 9.2-1 below presents recommended PCCP and AB thicknesses for various allowable <br /> Average Daily Truck Traffic (ADTT) and the use of concrete with a minimum 28-day compressive <br /> strength of 3,500 psi (which equates to a Modulus of Rupture equal to approximately 550 psi). In <br /> t:1YGE0 Page 121 December 13, 2021 <br /> Expect Excellence— <br />