Download EBOOK Assessment of Hydrology, Water Quality, and Trace Elements in Selected Placer-Mined Creeks in the Birch Creek Watershed Near Central, Alaska, 2001-05 PDF for free


Download EBOOK Assessment of Hydrology, Water Quality, and Trace Elements in Selected Placer-Mined Creeks in the Birch Creek Watershed Near Central, Alaska, 2001-05 PDF for free Category: Society & Social Sciences
The author of the book: Jose A Munoz
Format files: PDF, EPUB
The size of the: 268 KB
Language: English
ISBN-13: 9781243577610
Edition: Bibliogov
Date of issue: 3 September 2011

Description of the book "Assessment of Hydrology, Water Quality, and Trace Elements in Selected Placer-Mined Creeks in the Birch Creek Watershed Near Central, Alaska, 2001-05":

Executive Summary The U.S. Geological Survey, in cooperation with the Bureau of Land Management, completed an assessment of hydrology, water quality, and trace-element concentrations in streambed sediment of the upper Birch Creek watershed near Central, Alaska. The assessment covered one site on upper Birch Creek and paired sites, upstream and downstream from mined areas, on Frying Pan Creek and Harrison Creek. Stream-discharge and suspended-sediment concentration data collected at other selected mined and unmined sites helped characterize conditions in the upper Birch Creek watershed. The purpose of the project was to provide the Bureau of Land PDF Management with baseline information to evaluate watershed water quality and plan reclamation efforts. Data collection began in September 2001 and ended in September 2005. There were substantial geomorphic disturbances in the stream channel and flood plain along several miles of Harrison Creek. Placer mining has physically altered the natural stream channel morphology and removed streamside vegetation. There has been little or no effort to re-contour waste rock piles. During high-flow events, the abandoned placer-mine areas on Harrison Creek will likely contribute large quantities of sediment downstream unless the mined areas are reclaimed. During 2004 and 2005, no substantial changes in nutrient ePub or major-ion concentrations were detected in water samples collected upstream from mined areas compared with water samples collected downstream from mined areas on Frying Pan Creek and Harrison Creek that could not be attributed to natural variation. This also was true for dissolved oxygen, pH, and specific conductance-a measure of total dissolved solids. Sample sites downstream from mined areas on Harrison Creek and Frying Pan Creek had higher median suspended-sediment concentrations, by a few milligrams per liter, than respective upstream sites. However, it is difficult to attach much importance to the small downstream increase, less than 10 milligrams PDF per liter, in median suspended-sediment concentration for either basin. During low-flow conditions in 2004 and 2005, previously mined areas investigated on Harrison Creek and on Frying Pan Creek did not contribute substantial suspended sediments to sample sites downstream from the mined areas. No substantial mining-related water- or sediment-quality problems were detected at any of the sites investigated in the upper Birch Creek watershed during low-flow conditions.

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Jose A Munoz

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Download EBOOK Assessment of Hydrology, Water Quality, and Trace Elements in Selected Placer-Mined Creeks in the Birch Creek Watershed Near Central, Alaska, 2001-05 PDF for free



Download EBOOK Assessment of Hydrology, Water Quality, and Trace Elements in Selected Placer-Mined Creeks in the Birch Creek Watershed Near Central, Alaska, 2001-05 for free

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