An open-ended cylindrical standpipe contains a soil specimen as shown below. The soil is saturated with void ratio=0.75 and specific gravity = 2.7. Assuming both water levels are held at constant elevations and using the lower water level as the datum, determine the total head (ht), elevation head (he), and pressure head (hp) at points A, B, C, and D in the soil specimen. If the hydraulic conductivity of the soil is 10-5 cm/s, how long (min) after red dye is introduced in the influent reservoir will dye appear in the effluent? Point hz (cm) hp (cm) h (cm) 5 cm A A 15 cm Soil B: C B 20 cm C 15 cm D 5 cm