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One of the uses of the bias sampling approach is to help identify highly contaminated areas from the operation of a HWMU. If an area of high contamination is found, then removal of the hot spot areas may help avoid the need for a site-wide excavation of soils and bring the HWMU site to a satisfactory condition to allow closure in accordance with the closure plan decontamination standards and the regulations. The RCRA regulations require the use of discrete grab sampling to demonstrate compliance with concentration level standards for all nonwastewaters. For wastewaters, compliance with concentration level standards is based on the maximums (based upon composite or grab samples) for any one day, except for D004 through D011, which must be based on grab sampling. (See 40 CFR Part 268, Subpart D, Treatment Standards, § 268.40(b), Applicability of Treatment Standards, and footnotes of table, Treatment Standards For Hazardous Wastes, under § 268.40. |
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金虫 (小有名气)
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【答案】应助回帖
gx7568573(金币+25, 翻译EPI+1): 很好 2011-11-20 22:44:55
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偏倚抽样方法可以用于帮助从危险废物管理单元的运行确定(识别)高度污染区域。如果一个高污染区域被发现,那么热点区域的去除可以帮助避免对现场土壤挖掘的需要以及带给危险废物管理单元现场一个稳定良好的情况以确保关闭活动与关闭计划排除污染物标准及相关条例保持一致。 资源保护和回收法(RCRA没给全拼,应该是Resource Conservation And Recovery Act吧)要求使用非连续的随机采样以显示符合浓度水平标准,对所有非污水。 对于废水,符合浓度水平标准是基于任意一天的最大值(复合或随机抽样),除了D004到D011,必须基于随机抽样(见联邦法规40章268条,D部分,处理标准,268.40(b), 处理标准的适用,表格注脚,危险废物处理标准,在 268.40下。) |
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