Environmental Remediation Documents
https://scholarsbank.uoregon.edu/xmlui/handle/1794/6531
Documents relating to the mitigation of environmental hazards of sites such as mines, railroads, mills on National Forest lands.2024-03-29T12:24:50ZAjax/Magnolia project
https://scholarsbank.uoregon.edu/xmlui/handle/1794/6672
Ajax/Magnolia project
Umatilla National Forest (Agency : U.S.); North Fork John Day Ranger District (Or.); EA Engineering, Science, and Technology, Inc.; Millennium Science and Engineering, Inc.
Contains several documents, including abbreviated preliminary assessments of each of the Ajax and Magnolia mines, a site inspection of the two mines, a public participation plan, and an engineering evaluation/cost analysis (EE/CA of the mines, as well as earlier material on clay mineralogy and a sample data summary package. After screening of the waste piles with the Niton XRF unit, the proximity to Lucas Gulch and EPA's APA checklist, both Ajax and Magnolia were recommended for Site Inspection (SI) in the Abbreviated Preliminary Assessments. The SI found high concentrations of metals in the adits and retention ponds of both mines, with rock piles and soil contaminated from AMD, with arsenic migrating downstream from the Magnolia site to the onsite stream station at Ajax Mine. After an EE/CA was recommended, a Public Participation Plan was created and a list of recipients drawn up. Finally, an EE/CA was performed for a proposed CERCLA removal action for the two inactive gold mines. Seventeen metals were found to be ecological threats, some of which threatened spawning and rearing and the migratory pathways of federally-listed bull trout and steelhead, and arsenic created a threat to child recreationists and adult workers. Proposed alternatives include excavation and onsite disposal and adit discharge treatment.
1207 pp. Tables, figures, maps, references, appendices.
Section 22, Township 8 South, Range 35.5 East.
The two preliminary assessments are dated December 2002; the site inspection is January 2004; the public participation plan is April 6, 2004, and the EE/CA is May 2, 2005.
Captured June 18, 2008.
2002-12-01T00:00:00ZGranite Creek Mines site inspection
https://scholarsbank.uoregon.edu/xmlui/handle/1794/6621
Granite Creek Mines site inspection
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.
59 pp. Tables, figures, references, appendices.
Monumental Mine -- T 8 S, R 36 E, S 18 and 19; Cap Martin and Sheridan Mines -- T 8 S, R 35.5 E, S 24; Tillicum Mine -- T 8 S, R 35.5 E, S 23; Central Mine -- T 8 S, R 35.5 E, S 23.
Captured June 5, 2008.
2004-01-01T00:00:00ZGranite Creek Tributary Mines initiation of CERCLA investigation memorandum
https://scholarsbank.uoregon.edu/xmlui/handle/1794/6619
Granite Creek Tributary Mines initiation of CERCLA investigation memorandum
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.
4 pp.
Upper Central, Central, Golden Fraction, Granite Creek Mine #5, and Tillicum -- T 8S, R 35.5 E, S 23; Granite Creek Mine #7 and Cap Martin -- T 8 S, R 35.5 E, S 24; Monumental -- T 8 S, R 36 E, S 18 and 19.
2007-02-20T00:00:00ZUpper Central Mine abbreviated preliminary assessment
https://scholarsbank.uoregon.edu/xmlui/handle/1794/6609
Upper Central Mine abbreviated preliminary assessment
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.
19 pp. Tables, appendices, map, illus.
T 8 S, R 35.5 W, S 23.
Captured June 5, 2008.
2006-08-01T00:00:00Z