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Browsing Federal Agencies (Oregon Regional Offices) by Subject "Abandoned mines -- Environmental aspects -- Oregon -- Wallowa-Whitman National Forest"
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Now showing items 1-13 of 13
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(2006-08)Assesses site consisting of four collapsed adits, one of which has water discharge, and 6000-80000cy of wasterock materials, most of which is adjacent to Granite Creek. There are numerous trenches and apparent hydraulic ...
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(2006-08)Assesses site consisting of a large collapsed adit and approximately 3000cy of wasterock material adjacent to Granite Creek. A Niton XLt found that most metals at the site exceeded screening criteria for birds, invertebrates, ...
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(2006-08)Assesses mine site consisting of a large collapsed adit and approximately 1000cy of wasterock material, which is adjacent to a small ephemeral tributary to Granite Creek. A Niton XLt unit found that most metals at the site ...
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(2006-08)Assesses mine site consisting of a large collapsed adit and approximately 700cy of wasterock material adjacent to Granite Creek, with numerous trenches stemming from hydraulic mining and possible historic dredging operations. ...
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(2006-04)Assesses, through a streamlined risk assessment process, potential human health and ecological risks associated with mining-related contamination at the Monumental, Cap Martin, Sheridan, Tillicum, and Central Mines ...
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(2004-01)Documents Site Inspection performed by EA Engineering at five Granite Creek Mines: Monumental, Cap Martin, Sheridan, Tillicum, and Central. The objectives were to access the immediate or potential threat posed by wastes ...
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(2007-02-20)Documents, pursuant to the Guidelines of the National Oil and Hazardous Substance Contingency Plan (NCP), the decision to initiate a CERCLA investigation in nine locations at the Granite Creek Tributary Mines site. A Site ...
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(2007-02-20)Documents, pursuant to the guidelines of the National Oil and Hazardous Substance Contingency Plan (NCP), the decision to initiate a CERCLA investigation in nine locations at the Granite Creek Tributary Mines site. A Site ...
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(2003-02)Assesses mine and mill site, consisting of waste and tailings piles on flat to moderate side slopes and mill on steep slopes, with an opening in the ground surrounded by an unstable area. A Niton XRF unit found arsenic, ...
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(2006-08)Assesses mine site consisting of numerous trenches on the mountain slope, at least five of which are collapsed to partially collapsed adits, 9000-12,000cy of wasterock and 4000cy of tailings. A Niton XLt unit found all ...
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(2004-03)Assesses mine and mill site in moderate to steep side slopes, consisting of an open adit, waste rock dumps, tailings pond, and remains of a mill. A Niton XRF unit found numerous chemical elements exceeding regulations, ...
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(2004-03)Assesses mine and mill site on moderate to steep side slopes, with burned debris of the mill, open adit and an airshaft filled with water, with associated waste dumps. A Niton XRF unit found numerous chemical elements ...
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(2006-08)Assesses mine site on moderate side slopes, consisting of a large collapsed adit with minor seepage, approximately 500cy of wasterock near a small creek. A Niton XLt unit found that all metals exceeded screening criteria ...
Now showing items 1-13 of 13