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[미국] Elk River, 화학물질 유출
West Virginia American Water에 따르면, 캐너와 계곡의 모든 측량 구역에서 광산 기계 청소에 사용되는 화학물질인 MCHM의 검사 결과 ppb 두 단계에 머무르는 검출 불능 레벨이 나왔다. 이 레벨은 질병 관리를 위해 U.S. Centers가 설정한 보호 기준의 500배이다.
지역의 MCHM은 에크강의 따라서 발생한 화학물질 유출의 중대한 결과이다.
화학물질 유출은 다수의 도시를 정지시키고 30만명에게 영향을 끼쳤다.
이 유출은 자유 산업과 채굴을 위한 특수 화학물 제공자, 철강과 시멘트 분야, 독성 물질일 유출된 부지에 있는 4만8천갤런의 결합 탱크로부터 비롯됐다.
당국은 1만 갤런 이상의 화학물질이 주변 환경으로 유출 됐다고 예상한다.
[원문보기]
WV American Water addresses distribution toxin levels, odor issues from chemical spill
According to West Virginia American Water, the results of testing for 4-Methylcyclohexane Methanol (MCHM), a chemical used to clean mining equipment, in all measurement zones throughout the Kanawha Valley water distribution system are at the lower non-detectable level of below two parts per billion (ppb). This level is 500 times below the protective standard established by the U.S. Centers for Disease Control (CDC), which is 1 part per million (ppm).
The presence of MCHM in the region is a result of a significant chemical spill that occurred along the Elk River in Charleston, W.Va., on Thursday, Jan. 9, 2014, shutting down the majority of the city and affecting about 300,000 people. The discharge originated at Freedom Industries, a provider of specialty chemicals for the mining, steel and cement sectors, where a 48,000-gallon defective tank at the site leaked the toxic substance. Authorities believe that as much as 10,000 gallons of the chemical was released into the environment.
According to the West Virginia Bureau for Public Health, the CDC believes there is no evidence to suggest that levels below 10ppb would have adverse health effects. On Thursday, Feb. 20, 2014, West Virginia American Water announced that all points of testing throughout the water distribution system showed that levels of MCHM from the spill were below 10ppb level but that the company would continue flushing to address odor issues.
"Since February 14, we have worked with laboratories to test down to 2ppb or less of MCHM, and as of February 25, levels of the chemical are below this non-detect threshold throughout the water distribution system," said West Virginia American Water President Jeff McIntyre. "More than 30 employees from American Water subsidiaries in Kentucky, Pennsylvania, Indiana, and Illinois have worked tirelessly with our West Virginia employees to flush approximately 2,000 small dead-end water mains in the system."
West Virginia American Water will continue to respond to customer reports of lingering odor. This is being done solely to address reports about odor and is not related to any health concerns. The water in the distribution system has been below the CDC-established protective standard of 1ppm since January 18. West Virginia American Water intended to continue distributing bulk water through Wednesday, March 5; however, due to weather forecasts for the rest of the week, the company officially ended its bulk water distribution efforts.
[출처 = Waterworld / 2014년 3월 12일]
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