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Water Characteristics: .~. ;~.: , Field measurements, including temperature, conductivity, dissolved oxygen and pH were taken at each macroinvertebrate sampling station prior to tnacroinvertebrate sample collection on Mazch 16 and October 14. A Beckman Phi 11 field pH meter and electrode was used to measure pH. The pH electrode was calibrated with pH 7 and 10 buffers using atwo-point calibra[ion method integral to the operation of the Beckman meter. A Yellow Springs Instrument Model 58 dissolved oxygen meter and probe were used to obtain dissolved oxygen measurements. The dissolved oxygen probe was outfitted with a new membrane prior to being taken in the field, and was field calibrated prior to each reading using a saturated air technique. Conductivity was measured using a Yellow Springs Instrument Model 33 SCT meter and probe. Three water samples were collected at each station and of the dischazge for laboratory analysis. Two samples were collected in clean 1-liter Nalgene bottles for analysis of major ions. The bottles were rinsed twice in the stream water at the site prior to being filled with the sample. The third sample was collected in a similar rnatmer in a 250 ml Nalgene bottle and acidified to a pH of 2 with ultrapure nitric acid for total metals analysis. Samples were analyzed at the Colorado State University Soils Laboratory in Fort Collins. Stream bank and Riparian Condition: The riparian reconnaissance was conducted by walking along both river banks to characterize the immediate land use and condition of riparian vegetation above and below the discharge p.,;::t. Riparian plant communities were categorized and trapped on both sides of the river from the farthest upstream to the farthest downstream location. Observations as to riverbank structure and stability were included in this activity. RESULTS Macroinvertebrates: Macroinvertebrate samples yielded five orders of aquatic insects, as well as water mites. The insect orders included Plecoptera (stoneflies), Trichoptera (caddisflies), Ephemeroptera (mayflies), Diptera (true flies; most specimens recorded were in the Family Chironomidae, midges), and Coleoptera (beetles). Table 2 lists the members of each order that were identified in the samples. A total of 14 insect families were identified. In general, macroinver[ebrate populations appeaz to be healthy. The cobbles and boulders afford good habitat, and there is a more or less uniform and healthy growth of periphyton throughout the study area. '•.~ • 8