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Last modified
1/26/2010 12:52:04 PM
Creation date
10/11/2006 11:57:59 PM
Metadata
Fields
Template:
Water Supply Protection
File Number
8507
Description
Rio Grande Project
State
CO
Basin
Rio Grande
Date
6/1/1996
Title
Assessment of Metal Transport into and out of Terrace Rervoir/ Conejos County/ Colorado/ April 994 through March 1995
Water Supply Pro - Doc Type
Publication
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<br /> <br />INTRODUCTION <br /> <br />Terrace Reservoir is a small irrigation reservoir <br />located on the Alamosa River at an elevation of <br />about 8,550 ft above sea level in the San Juan <br />Mountains in Conejos County, Colorado (fig. I). <br />The Alamosa River and Terrace Reservoir are the <br />primary sources of water for crops and livestock <br />in the southwestern part of the San Luis Valley. <br />Irrigation ponds filled with Alamosa River water <br />are stocked with fish for private use. The Alamosa <br />River is important to the local economy and is a <br />substantial component of the agricultural community <br />(posey and others, 1995). <br />Much of the drainage basin upstream from <br />Terrace Reservoir contains extensive areas of <br />mineralized rocks that in some places have been <br />mined and that contribute a substantial metal load <br />to the Alamosa River and Terrace Reservoir. Gold, <br />silver, copper, and lead have been mined in the <br />basin for more than 100 years, and extensive gold- <br />mining activities have occurred intermittently at <br />the Summitville Mine (fig. 1) from 1873 to 1894, <br /> <br />1070 <br /> <br />106030' <br /> <br />37" <br />30' <br /> <br />Approximate eastern <br />boundary of the <br />San Juan Mountains <br /> <br />Summitville <br />Mine <br /> <br />/ Wightman Fork AR34.5 <br />Jasper 0 (above Terrace Reservoir) <br />I Terrace <br /><1' A .. Reservoir <br />'"'V!10SA <br /> <br /> <br />o Platoro <br /> <br />COLORADO <br /> <br />- <br /> <br />Location Map <br /> <br />370 <br /> <br />from 1926 to 1942, and from 1986 to 1992 <br />(U.S. Environmental Protection Agency, 1993). <br />In December 1992, the operator of the Summitville <br />Mine declared bankruptcy. The U.S. Environmental <br />Protection Agency immediately took over the <br />Summitville Mine site under the u.S. Environmental <br />Protection Agency Superfund Emergency Response <br />authority. Preliminary ecological and human-health <br />risk assessments indicated that concentrations of <br />dissolved and total aluminum, cadmium, copper, iron, <br />manganese, and zinc were large enough to be of <br />environmentsl concern, and copper was determined <br />to be the primary constituent of concern (Morrison <br />and Knudsen Corporation and ICF Keiser Engineers, <br />1994). <br />As partof risk-assessment and remediation <br />efforts, the U.S. Geological Survey began a study <br />on Terrace Reservoir in 1994, in cooperation with <br />the U.S. Environmental Protection Agency, to: <br />(I) Evaluate metal transport into and out of the <br />reservoir; (2) assess the physical and chemical charac- <br />teristics ofthe reservoir, including an evaluation of <br />the spatial and temporal distribution of metals in the <br /> <br />1060 <br /> <br /> <br />Monte Vista <br />o <br /> <br />~ <br />') <br />(G<' <br />"'v. <br /><$'~ <br />CJ- <br /> <br />Monte Vista National <br />Wildlife RefU~ <br /> <br /> <br />Alamosa National__ <br />Wildlife Refuge <br /> <br /> <br />Farmlands irrigated with <br />Alamosa River water <br /> <br />Modified from King (1995) <br /> <br />o <br />I <br />o <br /> <br />20 MILES <br />I <br />I <br />20 KILOMETERS <br /> <br />10 <br />I <br />I <br />10 <br /> <br />Figure 1. Location of Terrace Reservoir and location of sampling sites upstream and downstream from Terrace Reservoir. <br /> <br />2 Assessment of Metal Transport Into and Out ofTerrace Reservoir, ConeJos Coun~4,5 9 <br />April 1994 Through March 1995 <br />
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