Available from the U.S. Geological Survey, Branch of Information Services, Box 25286, Denver Federal Center, Denver, CO 80225, USGS Water-Resources Investigations Report 00-4170, 29 p., 1 fig.
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A comprehensive water-quality sampling network was implemented by the U.S. Geological Survey from 1995 through 1997 at 12 tributary sites to the Alamosa River. The network was designed to address data gaps identified in the initial ecological risk assessment of the Summitville Superfund site. Tributaries draining hydrothermally altered areas had higher median values for nearly all measured properties and constituents than tributaries draining unaltered areas. Colorado instream standards for pH, copper, iron, and zinc were in attainment at most tributary sites. Instream standards for pH and chronic aquatic-life standards for iron were not attained in Jasper Creek. Toxicological reference values were most often exceeded at Iron Creek, Alum Creek, Bitter Creek, Wightman Fork, and Burnt Creek. These tributaries all drain hydrothermally altered areas.
Abstract
Introduction
Purpose and Scope
Description of Study Area
Methods of Investigation
Data-Collection Methods
Data-Analysis Methods
Estimation of Hardness for Selected Sites
Lack of Dissolved-Metal Data for Selected Sites
Use of Censored Data
Comparison of Aggregated Data to Instream Standards
Comparison of Instantaneous Data to Instream Standards and Toxicological Reference Values
Summary Statistics for Selected Tributary Sites
Comparisons to Instream Standards and Toxicological Reference Values
pH Comparisons
Copper Comparisons
Iron Comparisons
Zinc Comparisons
Summary
References
Appendix
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