Leaking seals on ITW HALCW 2" return line ball valve have been replaced. 8 liter waters are drained out for this job. Water are drained into a thick plastic bag.  The bag is tie strapped , labeled, and put into a yellow garbage bin in MAA. Water sample is given to RPG. After analyzing, RPG will give instruction on how to deal with it. Since we just refilled NALCW to system before this job, the active level on sample is very low. We may dump them into active sump.  After seals change, The system is refilled . I started pump and set everything back to normal configuration. NO leak has been found on new seals. The HALCW system is operating good so far.