The goal of this 2-week laboratory is to conclude which seal of the landfill is leaking (refer to the Case Study in the beginning of the experiment for a refresher).
Suppose students in a certain lab section conduct the analysis of their Unknown Samples and pool the results on the board, as summarized below. The Unknown Numbers correspond to Site Numbers on the map shown in the experiment PDF.

Unknown #3 Pb2+ and Cd2+present, all others not present

Unknown #19 Ag+ present, trace Pb2+ present, all others not present

Unknown #25 Ag+, Hg22+, Bi3+, Cd2+, and Pb2+ present

Given these results, which seal would you conclude is leaking? (Note, the results in your laboratory may be different, and this set of data is just an example!)

Select one:

The closest to the Municipal Water Supply is leaking.

The seal closest to the Conservation Club is leaking.

The seal closest to the Garlic Processing Plant is leaking.