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STUDY UNIT DESIGN SURFACE-WATER CHEMISTRY The basic fixed site network was estab- lished to investigate the differences in stream- water quality associated with land use and environmental settings within the UCOL. Basic fixed sites were sampled monthly to determine temporal variability of water-qual- ity constituents. The three intensive fixed sites (a subset of the basic fixed site network) were sampled weekly to monthly to further define temporal variability. Synoptic studies were designed to investigate agriculture and urban development effects on water quality. Synop- tic sites were sampled one or two times to determine spatial influences of land use on water chemistry. EXPLANATION Surface-water chemistry .... Basic fixed sites V Intensive fixed sites Colorado Plateau Physiographic Province !;,~.,.., t..,.J 0 20 40 MILES I I I I I o 20 40 KILOMETERS Agriculture synoptic Urban synoptic . o GROUND-WATER CHEMISTRY Southern Rocky Mountains To evaluate the effects of urban land use on shallow ground-water quality, five areas within the Southern Rocky Mountains that are undergoing urban development and use ground water as a primary drinking-water source, were studied. An overall assessment of water quality in predominantly alluvial aquifers of the Southern Rocky Moun- tains was also completed. In addition to the overall assessment, wells were selected in or near mining areas. Allu- vial aquifers were selected for these studies because they are generally pro- ductive and can be susceptible to land- use practices. (j) Aquifer survey site o Aquifer survey site in or near mining areas III Prominent alluvial deposits in the Southern Rocky Mountains o 20 40 MILES I I I o 20 40 KILOMETERS STREAM ECOLOGY Ecological assessments were done at all basic fixed sites plus one additional site on the Blue River. A synoptic study in mining areas of the Southern Rocky Mountains investigated trace elements in streambed sediment, aquatic moss, and surface water. A characterization of the algal and inverte- brate communities and nutrient concentra- tions in surface water was completed at five sites on the Eagle River. Southern Rocky Mountains . t:._<~~~( Physiographic Province ________....t ) /".,J ~ .~ J("".JJ~ · ,J (..~,r-J-'~ --" , f'" ~ EXPLANATION l Stream ecology 7 .... Basic fixed sites , ~ . Trace-element synoptic site :1\ · Eagle River synoptic site !.~;.,.., 0 '_I"J 40 MILES I 20 o 20 40 KILOMETERS Study Unit Design 21