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Home My WebLink About1978 04-12 Oxygen decline noted at Kohlman THE REVIEW Oxygen decline noted at Kohlman Don Watson, director of the Lakes Improvement Association, presented the pollution problem of Lake Kohlman at the Maplewood City Council meeting. "During the present winter, the oxygen level was checked four times," he reported.In early March,five parts of the lake were checked, and the oxygen level was found to be between 0.6 and 1.6 parts per million. Under 2 parts per million is dangerous. "I can't see where any of these ponding areas at this time are sufficient to take care of run-off into Kohlman lake," said Watson. r /02, /Q?f-