g column of sand has water flowing through it. At the left end of the column, the pressure is 37,470 Pa, and the elevation is 0.310 m. At the right end of the column, the pressure is 26,820 Pa, and the elevation is 0.260 m. The permeability of the sand is 2.07 x 10-13 m2. The internal diameter of the column is 0.0100 m, and the column is 1.05 m long. Total porosity is 0.21. Effective porosity is 0.18. How long will it take for a sorbing tracer with R