针对 LUST 市场的 CMT 系统
美国 LUST 市场
- 150,000 个 LUST 遗址
- 关闭 LUST 遗址的强大政治和经济激励措施
- 结束昂贵的长期监测
- 重建
对美国 LUST 遗址进行多层次监测的兴趣与日俱增
- 传统油井由于混合物（混合）而产生偏差样本
- 常规水井中的环境流动会交叉污染含水层
多层监测井解决了上述问题，既能获得精确的深度离散样本，又能防止井内环境流动。
更完整、更准确的数据集可迅速确定对下游受体构成威胁的 LUST 遗址，以及无需采取进一步行动即可关闭的 LUST 遗址。
在 LUST（地下储油库泄漏）现场使用的四种多层次取样方法
的优缺点
Description
Advantages
Disadvantages
Diffusion Bag Samplers
• Low cost • Can collect many samples from a single well • Compatible with all gasoline constituents except MTBE, TBA and ethanol
• Data worthless if there is ambient vertical flow in the well • Samples water in the well, not in the aquifer
Nested Wells
• Standard materials • Many contractors available to install • Many sampling options
• Often poor well seals • Prohibited or discouraged in many areas • Large annular space increases purge time
3-Well Cluster
• Standard materials, abundance of contractors • Good annular seals between zones • Many sampling options • Highest quality samples
• Increased drilling costs • Increased permit fees in some areas
3-Channel CMT
• Good annular seals prevent vertical groundwater movement and cross contamination • Possibly lowest cost
• Fewer sampling options available. • Long purge times if micro-purge not used. • Positive sample bias if sampled incorrectly
| 说明 | 优点 | 缺点 |
| 扩散袋取样器 |
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| 嵌套井 |
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| 3 井群 |
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| 3 通道 CMT |
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