Collection date (2007) Untreated waste water Treated waste water
        January/16 3.4 23.1
 /17 28.3 47.6
 /18 17.1 10.8
/23 135.0 20.1
 /24 16.5 25.7
 /25 29.7 9.3
 /30 20.5 22.6
 /31 2.7 28.0
February/05 3.4 2.1
Table 2: Acetone concentrations (mg/L) in waste waters from the laboratory building.