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Local roads and streets as rated in this table, have an <br />all-weather surface expected to csrr~~ automobile traffic <br />all year. Thee have a subgrade of underling soil <br />material; s base consisting of Eravel, crushed rock, <br />or soil material stabilized with lime or cement; and <br />a flexible or rigid surface, commonly asphalt or concrete. <br />These roads are graded to shed water and have ordina.r3 <br />provisions for drainage. Thee are built msinlo from <br />soil at hand, and most cuts and fills are less than <br />5 feet deep, <br />soil properties that -cost affect design snd construc- <br />tion of roads and streets are load-supeorting capacity <br />and stabilit~r of the subgrade, and the wor~csbility <br />and eusntitr of cut and fill material available, Th~a <br />9AS'-?0 and i,*nified classifications of the soil msteri?il, <br />and also the shrink-s•Nell potential, in dicste traffic- <br />supporting capacit-r, ~Jetness and flooding affect <br />stabilit;- of the material. Slope, depth to hard rock;, <br />content of stones snd rocks, and wetness affect ease <br />of excavation snd amount of cut and fill needed to <br />reach an e•ren grade, <br />Sanitary landfill is a method of disposing of refuse <br />in dug trenches, The waste is spread in thin ls~ers, <br />compacted, and covered with soil throughout the disposal <br />period, Landfill areas are sub,~ect to hesv-~ vehiculf.r <br />trsffic. Same soil ~rooerties that affect suitabilit.~r <br />for landfill are ease of excavation, hazard of pollut- <br />ing ground water, snd trafficability. The best soil <br />hags moderatel;~ slow aermeabilit-~, withstand heav-; <br />trsffic, and are friable and ease to excavate, <br />J <br />