Hydrological and geochemical investigations of selenium behavior at Kesterson Reservoir

Zawislanski, P.T.

doi:10.2172/5284249

Cited by 3 publications

(5 citation statements)

References 27 publications

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“…Comparison with Previous Studies. Overall, these find ings agree with field ( , ) and laboratory () studies in which long-term Se oxidation rates are very slow following an initial more rapid release of bound Se. The apparent predominance of organic Se forms may explain the initial release since oxidation rates for organic Se (), algae-accumulated Se (), and even biogenic Se(0) () can be an order of magnitude faster than the oxidation of abiotic Se(0).…”

Section: Resultssupporting

confidence: 86%

Selenium Speciation, Solubility, and Mobility in Land-Disposed Dredged Sediments

Zawislanski

Benson

TerBerg

et al. 2003

Environ. Sci. Technol.

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Pilot-scale tests for the land disposal of Se-enriched sediments from the San Luis Drain were performed in the San Joaquin Valley, California. Three test plots were instrumented and monitored on a dirt-road embankment near the sediment source area, providing an opportunity to measure Se oxidation and solubilization rates over a period of 2-3 yr. Soil, soil water, and groundwater data indicated that the amendment did not cause movement of dissolved Se below a depth of 15 cm. The low permeability of underlying sediments and the overall low Se solubility limit Se movement toward the groundwater table. Selenium remained in reduced forms and largely immobile at this site, although in-situ Se oxidation was measurable. Soluble Se concentrations increased from less than 0.5% to approximately 2.5% in the first 207 d following sediment application. Minor Se solubilization occurred after 439 and 704 d. Changes in Se fractionation measured using sequential extractions and Se speciation based on X-ray spectroscopy (XANES) results were in qualitative agreement. XANES results indicated initially rapid oxidation of organo-Se and/or elemental Se to selenite during the first 207 d, followed by minor oxidation after 439 d. Further solubilization of the Se inventory is anticipated, but at a low rate of 1-2% per year, comparable to rates measured in other studies.

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Section: Resultssupporting

confidence: 86%

Selenium Speciation, Solubility, and Mobility in Land-Disposed Dredged Sediments

Zawislanski

Benson

TerBerg

et al. 2003

Environ. Sci. Technol.

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“…2.1.3a). Maximum solution Se concentrations in the other northern Pond 9 monitoring sites were found at shallower depths shortly after termination of drain water disposal, and drifted downwards in following years (LBL, 1987;Benson et al, 1992). The location of the soluble Se maxima around the 1.50 m depth in late summer-fall months has now persisted for 3 years.…”

Section: 1 Soluble Selenium Profiles and Time Trends At Site P9lmentioning

confidence: 96%

“…The major ions in solution are dominated by Na, SO,, and C1 (each typically higher than 10 mM,), with lower concentrations of Ca and Mg (typically lower that 30 mMJ. Soil water samples from other northern Pond 9 monitoring sites collected during drought years (1987 -1991) showed that highest pore water salinities were previously associated with the shallower root zone and soil surface (LBL, 1987;Benson et al, 1992). Above average rainfall during most years since then have been effective in leaching soluble salts deeper in soil profiles The (Zawislanski et al, 1995 at site…”

Section: Pore Water Salinity Trendsmentioning

confidence: 99%

Hydrological and geochemical investigations of selenium behavior at Kesterson Reservoir. Progress report, October 1, 1994--September 30, 1996

Zawislanski¹,

Tokunaga²,

Benson³

1997

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“…These analyses would determine trends and refine the accuracy of predictions developed during this assessment. Improved modeling capability for extent of flooding and waterborne Se concentrations in rainwater pools during very wet years. Model predictions of the extent of flooding and concentrations of the waterborne Se were made previously using a limited database (Benson, Tokunaga et al ; LBL ). By incorporating the recent data (since 1989) into the model, it should be possible to improve estimates of potential risks to aquatic‐dependent birds during very wet years. More Se data for detritus, detritivores (e.g., sowbugs [Oniscidea]), and mushrooms and their consumption by animals.…”

Section: Monitoring Risk Assessment and Managementmentioning

confidence: 99%

“…Improved modeling capability for extent of flooding and waterborne Se concentrations in rainwater pools during very wet years. Model predictions of the extent of flooding and concentrations of the waterborne Se were made previously using a limited database (Benson, Tokunaga et al ; LBL ). By incorporating the recent data (since 1989) into the model, it should be possible to improve estimates of potential risks to aquatic‐dependent birds during very wet years.…”

Section: Monitoring Risk Assessment and Managementmentioning

confidence: 99%

Kesterson Reservoir: 30 Years of Selenium Risk Assessment and Management

Ohlendorf

Santolo

Byron

et al. 2019

Integr Envir Assess & Manag

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Severe effects of selenium (Se) occurred among birds feeding and nesting at Kesterson Reservoir (San Joaquin Valley, California, USA) in 1983 to 1985. This paper describes the integration of site monitoring, risk assessment, and management actions conducted after the effects of Se were discovered. Selenium contamination of the site occurred over just a few years, but actions to resolve the contamination issues required >20 y. The reservoir, a series of 12 ponds totaling about 1280 acres (518 hectares), served for storage and evaporation of subsurface agricultural drainage. Selenium concentrations in reservoir inflow in 1983 were about 300 µg/L, primarily as selenate; within the ponds it was biogeochemically reduced to other inorganic and organic forms and bioaccumulated by biota or deposited to sediments. An estimated 9000 kg of Se were delivered to Kesterson in 1981–1986. A 1985 order required cleanup and abatement of the reservoir, so the United States Bureau of Reclamation and the US Department of the Interior undertook actions and studies to reduce hazards to birds. In 1988, about 1 million cubic yards (764 500 m3) of soil were used to fill portions of the reservoir, transforming it into terrestrial habitat. Intensive monitoring began in 1989 to assess the impact of the reservoir on wildlife, provide a basis for adjusting site management, verify the effectiveness of cleanup actions, and provide a basis for modifying future monitoring. Monitoring continued until 2014, with modifications and management actions based on results of 2 risk assessments (1993 and 2000). Monitoring results in 2013–2014 showed that Se concentrations were relatively stable over time and risks to wildlife were low. From the initial problem discovery to the conclusion of actions taken to remediate the site, combining responsive, reactive, and adaptive monitoring; modeling; risk assessment; and mitigation actions proved effective in solving the problem so that risks to wildlife were reduced to minimal levels. Integr Environ Assess Manag 2020;16:257–268. © 2019 SETAC

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Hydrological and geochemical investigations of selenium behavior at Kesterson Reservoir

Cited by 3 publications

References 27 publications

Selenium Speciation, Solubility, and Mobility in Land-Disposed Dredged Sediments

Selenium Speciation, Solubility, and Mobility in Land-Disposed Dredged Sediments

Hydrological and geochemical investigations of selenium behavior at Kesterson Reservoir. Progress report, October 1, 1994--September 30, 1996

Kesterson Reservoir: 30 Years of Selenium Risk Assessment and Management

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