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<br />11'l'ENb 1)( 1I.:z..... <br /> <br />AET #01-00578 - Page 2 <br /> <br />surface compaction should be subcut and replaeed with better quality material to reattain <br />grade. <br />. PIaeement of a l' thiek sand layer in the upper portion of the subgrade can improve <br />pavement performance, The pavement should be designed for an R-value of 10 if the on- <br />site soils are utilized for subgrade. If a )' thiek sand layer is placed in the upper portion <br />of the subgrade, the pavement ean be designed for an R-value of 20. <br /> <br />e <br /> <br />. <br /> <br />. <br />