Fig. 7. Change in Cl/Br mass ratio, with changes in total Cl^– concentration for lysimeter samples at the Subsurface Disposal Area. Solid line represents mixing of brine with natural recharge, dashed line represents mixing of 10 mg L^–1 Br^– solution in silica flour with natural recharge, and dash–dot line represents mixing of brine with 10 mg L^–1 Br^– solution.