 Specimen of the outflow in 1998, however, showed increased levels of copper, zinc, and to some extent of cadmium, and land specimen in the abandoned embankments of the shooting range showed they contained levels of lead exceeding officially sanctioned levels.During the 1990s, aquatic plants, mostly rigid hornwort, have spread and now covers the lake bed.Along the shores are dense stands of common reed, lesser bulrush, common bulrush, and unbranched bur-reed.