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11 <br />.., <br />It should be noted that all lots having aconventional-type drain field with pump are reviewed at a minimum of every five years by the <br />health department as required by 15 A NCAC 18A .1961 (Maintenance of Sewage Systems). <br />Ultra Shallow Trench Conventional Systems are placed in areas with 24 inches or more of provisionally suitable characteristics and a <br />inch soil cap is placed over tho trenches. <br />Shallow Trench Conventional Systems are placed in areas with 30 inches or more of provisionally suitable characteristics. <br />Conventional Systems are placed in areas with 36 inches or more of provisionally suitable characteristics. <br />