ABSTRACT
Groundwater within the subsurface drainage area of the Berlin-Friedrichshagen waterworks (southeast of Berlin, Germany) is in part highly contaminated with ammonium due to former disposal of domestic and industrial sewage (coal gasification plant) on land and drainage from the unsealed, sludge-drying places of the Munchehofe wastewater treatment plant (Fig. 1). The contaminated aquifer has a volume of about 200 million m' (1.5 km length, 3 km width, and 45 m depth). The ammonium concentration in the groundwater spans a range of 10-90 mg/L NH4-N. Nitrate was measured only beneath the former irrigation fields in the upper part of the aquifer [I].
