Discussion:
In 1960, due to perfluorinated compound (PFC) leakage in the Cottage Grove, MN site, the St. Peter Sandstone aquifer was contaminated, and elevation concentration was across the Cottage Grove town. The Mississippi River is located 8.6 km downstream of Cottage Grove site. The concentration in 1960 at the Cottage Grove site is 41 ppb.a) Assume diffusion is the only transport mechanism, Dd = 10-8 m2/sec and tortuosity = 0.7. What is the concentration at the 6 km downstream of the site after 100 years?b) After 50 years, PFC is detected at a downstream monitoring well, and the concentration is 1 ppb. What is the distance between the monitoring well and Cottage Grove spill site in meter?