|5:1 to 10:1||[[Underdrain]] recommended<br>if < 15 mm/hr||1 to 2||5 to 15||0 to 2||No||4m- Building Foundation<br>Underground Utilities, <br>Drinking Water Wellhead<br>Protection Areas||No||2 yr | |5:1 to 10:1||[[Underdrain]] recommended<br>if < 15 mm/hr||1 to 2||5 to 15||0 to 2||No||4m- Building Foundation<br>Underground Utilities, <br>Drinking Water Wellhead<br>Protection Areas||No||2 yr |