Environmental Remediation Documents
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The Comprehensive Environmental Response, Compensation and Liability Act (CERCLA) process assesses site conditions, evaluates hazards to humans and the natural environment, determines the level of cleanup required and selects an appropriate cleanup alternative. This collection houses documents related to this process of environmental remediation of human activities.
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Browsing Environmental Remediation Documents by Author "Wallowa-Whitman National Forest (Agency : U.S.)"
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Item Open Access Buffalo Mine abbreviated preliminary assessment(2008-08) Wallowa-Whitman National Forest (Agency : U.S.)Assesses mine site on moderately steep side slopes, consisting of two adits, associated wasterock and tailing ponds, one with water treatment facilities and miscellaneous buildings. A Niton XLt unit found that all metals at the site exceeded screening criteria for birds, invertebrates, and plants, but only arsenic (13.13 to 338 mg/kg) exceeded EPA Region goals. The site has been given a Low Priority for any future site assessments.Item Open Access Granite Creek Mine #5 abbreviated preliminary assessment(2006-08) Wallowa-Whitman National Forest (Agency : U.S.)Assesses mine site consisting of a large collapsed adit and approximately 500cy of wasterock material adjacent to Granite Creek, with numerous trenches and apparent hydraulic mining. A Niton XLt unit found that most metals at the site exceeded screening criteria for birds, invertebrates, and plants, but only arsenic (59.7 mg/kg) exceeded EPA Region goals. Since the wasterock forms a part of the embankment for Granite Creek, the site has been given a High Priority for further site assessment.Item Open Access Granite Creek Mine #6 abbreviated preliminary assessment(2006-08) Wallowa-Whitman National Forest (Agency : U.S.)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 exceeded screening criteria for birds, invertebrates, and plants, but only arsenic (7.16 mg/kg) exceeded EPA Region goals. Further site assessment was not warranted.Item Open Access Granite Creek Mine #7 abbreviated preliminary assessment(2006-08) Wallowa-Whitman National Forest (Agency : U.S.)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. A Niton XLt unit found that most metals at the site exceeded screening criteria for birds, invertebrates, and plants, but only arsenic (79 mg/kg) exceeded EPA Region goals. The site has been given a High Priority.Item Open Access Granite Creek Mines site inspection(2004-01) Wallowa-Whitman National Forest (Agency : U.S.); EA Engineering, Science, and Technology, Inc.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 at the site to human health and the environment, and to collect information to support a CERCLA decision, including background research and file review; onsite and offsite reconnaisance; and collection and analysis of soil, waste, surface water, pore water, sediment, plant tissue, and benthic macroinvertebrate samples. Based on the elevated concentrations of metals detected in onsite soil and waste rock samples at all five mine sites, as well as onsite surface water samples collected at the Monumental Mine, an Engineering Evaluation/Cost Analysis (EE/CA) is recommended.Item Open Access Granite Creek Tributary Mines initiation of CERCLA investigation memorandum(2007-02-20) Wallowa-Whitman National Forest (Agency : U.S.)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 Inspection has determined that a hazardous release has occurred, and a human health and ecological risk assessment has been performed and acceptable exposure has been exceeded. Identifies possible threats to nearby human populations, animals, the food chain, soils, and drinking water.Item Open Access Monumental abbreviated preliminary assessment(2003-02) Wallowa-Whitman National Forest (Agency : U.S.)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, lead, and mercury exceeded EPA Region goals, and the upper tailings pond was found to be breached. A Site Inspection is recommended.Item Open Access New York Mine abbreviated preliminary assessment(2006-08) Wallowa-Whitman National Forest (Agency : U.S.)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 metals detected at the site exceeded screening criteria for birds, invertebrates, and plants, but only arsenic (133.5 to 1459 mg/kg) exceeded EPA Region goals. Based on the high levels of arsenic throughout the site, the proximity of wasterock and tailings material to Granite Creek, the ease of access to the site, mine drainage, and numerous physical hazards, a High Priority has been assigned for further site assessment.Item Open Access Tillicum abbreviated preliminary assessment(2003-02) Wallowa-Whitman National Forest (Agency : U.S.)Assesses mine site consisting of waste piles placed on moderate to steep side slopes. A Niton XRF unit found arsenic and lead exceeded EPA Region goals. Based on its proximity to Granite Creek, a Site Inspection is recommended.Item Open Access Upper Central Mine abbreviated preliminary assessment(2006-08) Wallowa-Whitman National Forest (Agency : U.S.)Assesses mine site on moderately steep side slopes consisting of four collapsed adits and about 1500cy of wasterock. A Niton XLt unit found most metals detected at the site exceeded screening criteria for birds, invertebrates, and plants, but only arsenic (84.1 mg/kg) exceeded EPA Regional goals. Based upon the location of the adits, lack of evidence of water discharge from the mines, lack of surface water sources, and relative ease of access by the general public, the site has been ranked a Low Priority for further assessment.