Environmental conditions of pH (□), temperature (○), and conductivity (▵) measured at the following sites: the A-drift slump (location 1) (A), the A-drift upper region (location 2) (B), the B-drift upper region (location 3) (C), the C-drift upper region (location 4) (D), and the discharge point (pipe entrance) at the Richmond five-way (location 5) (E). Refer to Fig. for the location points of analytical measurements. Nov, November; Feb, February; Oct, October.