Question: 21. (20 points) There is a 6.5ft difference in hydraulic head in two wells placed 1500ft apart in the direction of groundwater flow in a

21. (20 points) There is a 6.5ft difference in hydraulic head

21. (20 points) There is a 6.5ft difference in hydraulic head in two wells placed 1500ft apart in the direction of groundwater flow in a 13ft deep by 250ft wide confined aquifer (perpendicular to the direction of groundwater flow). The aquifer is a sand/gravel formation with a hydraulic conductivity of 0.015ft/s and a porosity of 0.36 and contains a dissolved plume of 1,1,1trichloroethane (1,1,1TCA) contamination. Studies in an aquifer with similar properties estimated a retardation factor of 3.4 for 1,1,1-TCA transport. What is the volumetric rate of groundwater flow (m3/d) through the aquifer and what is the expected velocity of 1,1,1 TCA movement (m/d) in the aquifer

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