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a~ <br />1~ <br />• <br />Ultra Shallow Trench Conventional Systems are placed is areas with 24 inches or more of provisionally suitable characteristics aac <br />inch soil cap is placed over the txenches. <br />Shallow Trench Conventional Systems are placed, in areas with 30 inches or more of provisionally suitable characteristics. <br />Conventional Systems ara placed in areas with 36 iaches or more of provisionally suitable characteristics, <br />