Laserfiche WebLink
CORNERSTONE <br />EARTH GROUP <br />except where limited sections of structural slabs are included to help span irregularities in <br />retaining wall backfill at the transitions between at-grade and on-structure flatwork. <br />8.1.2 Pedestrian Pavers <br />Concrete unit pavers subject to pedestrian and/or occasional light pick up loading should be at <br />least 4 inches thick and supported on at least 4 inches of Class 2 aggregate base overlying <br />subgrade prepared in accordance with the "Earthwork" recommendations of this report. Pavers <br />that will be subject to heavier or frequent vehicular loading should be designed in accordance <br />with the recommendations in the "Vehicular Pavements' section below. <br />SECTION 9: VEHICULAR PAVEMENTS <br />9.1 ASPHALT CONCRETE <br />The following preliminary asphalt concrete pavement recommendations tabulated below are <br />based on the Procedure 608 of the Caltrans Highway Design Manual, estimated traffic indicies <br />for various pavement-loading conditions, and on a preliminary design R-value of 10. The <br />preliminary design R-value was chosen based on the results of previous laboratory testing <br />performed on surficial samples collected from the adjacent Ironwood development and <br />engineering judgment considering the variable surface conditions. <br />Table 7: Preliminary Asphalt Concrete Pavement Recommendations (R-value = 10) <br />Design <br />Traffic Index <br />(TI) Asphalt <br />Concrete <br />(inches) Class 2 <br />Aggregate <br />Base (inches) Total Pavement <br />Section Thickness <br />(inches) <br />4.0 2.5 7.0 9.0 <br />4.5 2.5 9.0 1 1.5 <br />5.0 3.0 9.0 12.0 <br />5.5 3.0 11.0 14.0 <br />6.0 3.5 12.0 15.5 <br />6.5 4.0 13.0 17.0 <br />As required by the City of Pleasanton, additional R-value testing of exposed subgrade soils <br />should be performed once street cuts are made to confirm the final design R-value. If testing <br />indicates a significantly higher R-value, it may be feasible to reduce pavement sections. <br />Frequently, the full asphalt concrete section is not constructed prior to construction traffic <br />loading. This can result in significant loss of asphalt concrete layer life, rutting, or other <br />pavement failures. To improve the pavement life and reduce the potential for pavement distress <br />through construction, we recommend the full design asphalt concrete section be constructed <br />prior to construction traffic loading. Alternatively, a higher traffic index may be chosen for the <br />areas where construction traffic will use the pavements. <br />Ponderosa Active Adult Community Page 21 <br />132-2-t <br />