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a. 200 mL of water sample was collected from a river. 5 mL of the river...

a. 200 mL of water sample was collected from a river. 5 mL of the river water diluted to 1 L. A BOD bottle which is 300 mL is filled with this water and aerated. The dissolved oxygen content was 7.8 mg/L initially. After 5 days, the dissolved oxygen content had dropped to 4.8 mg/L. What is BOD5 of this sample?

b. Hydraulic conductivity of soil is measured as 2 x 10-2 cm/sec. After an accident, a truck carrying dissolved salt solution releases its contents to surface. The distance between the spill and a groundwater well is 1600 meter. The groundwater elevation at the spill location is 5.5 meter and well location is 5.3 meters. Porosity of soil is 0.4. Darcy velocity is most nearly (cm/day):

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