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Evaluation of water quality management problems caused by agricultural drainage water entering Modoc national wildlife refuge and the Ash Creek wildlife management area

The objective of this investigation was to determine water quality problems or potential problems caused by agricultural drainage water entering the Modoc National Wildlife Refuge and the Ash Creek Wildlife Management Area.

During 1987, the water supplies entering the Modoc National Wildlife Refuge and the Ash Creek Wildlife Management Area were sampled for pesticides and heavy metals conceivably associated with agricultural drainage. Purpose of the sampling was to determine if concentrations of toxic substances were present that would pose a threat to fish and wildlife. Sampling was done in January and June corresponding to the primary periods of chemical application in the watershed areas. Only pesticides used currently or previously in the areas were analyzed. Samples did not contain pesticides at detectable concentrations. Metal results were similar to background levels for surface waters in the Pit River system. Board staff concludes that agricultural chemical use or other toxics do not pose a threat to fish and wildlife in the two areas. Accordingly, additional intensive monitoring does not appear to be a priority activity unless chemical usage changes in the watersheds supplying the wildlife areas.

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美 国
Networks
agINFRA The RING is part of the agINFRA project EC 7th framework program INFRA-2011-1.2.2 - Grant agr. no: 283770