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Bull Environ Contam Toxicol

Title:		"A Case Study of Natural Attenuation of Chlorinated Solvents Under Unstable Groundwater Conditions in Takahata, Japan"
Author(s):		Kawabe Y; Komai T;
Address:		"National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, 3058567, Japan. y-kawabe@aist.go.jp. National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, 3058567, Japan. Graduate School of Environmental Studies Tohoku University, 6-6-20, Aoba, Aramaki, Aoba-ku, Sendai, 9808579, Japan"
Journal Title:		Bull Environ Contam Toxicol
Year:		2019
Volume:		20190121
Issue:		2
Page Number:		280 - 286
DOI:		10.1007/s00128-019-02546-9
ISSN/ISBN:		1432-0800 (Electronic) 0007-4861 (Linking)
Abstract:		"The natural attenuation behavior of chlorinated solvents and their risks to human health at a contaminated groundwater site in Takahata, Japan, were investigated. It was found that volatile organic compound (VOC) concentrations gradually decreased via two attenuation mechanisms, namely dilution and biodegradation. It was estimated that the VOC concentrations will be below the Japanese limits within 30 years after stopping the active remediation in 2003, which suggests that there is a high possibility that monitored natural attenuation can be adopted as the clean-up method at this contaminated site. The risk levels of VOCs at the present time are much lower than those at the time when the contamination was discovered. Vinyl chloride still presents a risk in some wells, and there were occasional unexpected increases in the risk levels of tetrachloroethylene, trichloroethylene, and cis-1,2-dichloloethylene, which means that continuous monitoring of the groundwater is necessary for forecasting risk levels"
Keywords:		"Biodegradation, Environmental Groundwater/*chemistry Humans Hydrocarbons, Chlorinated/analysis/*isolation & purification Japan Oxidation-Reduction Solvents/analysis/*isolation & purification Volatile Organic Compounds/analysis/*isolation & purification Wa;"
Notes:		"MedlineKawabe, Yoshishige Komai, Takeshi eng 2019/01/23 Bull Environ Contam Toxicol. 2019 Feb; 102(2):280-286. doi: 10.1007/s00128-019-02546-9. Epub 2019 Jan 21"