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20 <br />• <br />Ultra Shallow Trench Conventional Systems are placed in areas with 24 i=bes or more of Mvisionally suitable chasactedstics <br />inch soil cap is placed ova the trenches. <br />Shallow Trench, Conven*ml Systi= an placed in areas with 30 inches or more of provisionally suitable characteristics. <br />ConV=dO al Systems are placed in arras with 36 rather or move of pravis MUUY Suitable eh WMdg.dcs. <br />ti <br />