Problem
In a field study, a nonadsorbing (conservative) tracer (chloride) was injected into a groundwater aquifer (unconfined and relatively homogeneous) along with two adsorbing organic compounds (carbon tetrachloride and tetrachloroethylene). A test well 5 m downstream from the injection well was monitored for all three compounds. The average time of arrival (breakthrough time) at the monitoring well was 66 days for chloride ion, 120 days for carbontetrachloride, and 217 days for tetrachloroethylene.
(a) Obtain from the above data the retardation factors for the sorbing compounds.
(b) Obtain the field-determined partition constants. The soil organic carbon is 0.02.
(c) Compare with Kd obtained using the correlation of Curtis et al. (1994) given in text. Explain any difference.
The response should include a reference list. Double-space, using Times New Roman 12 pnt font, one-inch margins, and APA style of writing and citations.