Orange County NC Website
a. <br />Ultra Shallow Trench Conventional Systems are, placed is areas with 24 inches or more of provisionally suitable characteristics az <br />inch soil cap is placed over the trenches. <br />Shallow Trench Convetrtipnal Systems aze placed in areas with 30 inches or mare of provisionally suitable characterisdes. <br />Conventional Systems are placed in areas with 36 inches or more of provisionally suitable characteristics. <br />