Streambed sediments were analyzed for trace elements and hydrophobic pesticides and other organic compounds to determine occurrence and spatial distribution. Depositional zones at all Fixed Sites and numerous synoptic sites. All Fixed Sites and some synoptic sites. Stream Ecology Intensive assessments Fish, benthic invertebrates, algae, and aquatic and riparian habitats were sampled and described to assess aquatic biological community structure in different land uses and associated habitats. Stream reaches collocated with Fixed Sites.
Sites represent the variety of land uses, bedrock geology, and surficial texture within the basin.
Benchmark stream reaches chosen to represent relatively pristine conditions in agricultural areas. Comparison sites determine variability within RHUs. Newly installed monitoring wells completed at water table located using a statistically random selection process. Sites with monitoring wells completed at water table chosen using a statistically random selection process. Flow path Major ions, nutrients, pesticides, tritium, DOC, CFCs and isotopes of oxygen, hydrogen, and nitrogen and gas composition were sampled and analyzed to determine changes in nutrients and pesticides along a flow path.