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首页> 外文期刊>Ground Water Monitoring & Remediation >Application of a New Vertical Profiling Tool (ESASS) for Sampling Groundwater Quality During Hollow-Stem Auger Drilling
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Application of a New Vertical Profiling Tool (ESASS) for Sampling Groundwater Quality During Hollow-Stem Auger Drilling

机译：新型立式轮廓分析工具（ESASS）在空心钻杆钻探过程中对地下水质量进行采样的应用

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摘要

A new tool called ESASS (Enhanced Screen Auger Sampling System) was developed by the U.S. Geological Survey. The use of ESASS, because of its unique U.S. patent design (U.S. patent no. 7,631,705 Bl), allows for the collection of represen-tative, depth-specific groundwater samples (vertical profiling) in a quick and efficient manner using a 0.305-m long screen auger during hollow-stem auger drilling. With ESASS, the water column in the flights above the screen auger is separated from the water in the screen auger by a specially designed removable plug and collar. The tool fits inside an auger of standard inner diameter (82.55 mm). The novel design of the system constituted by the plug, collar, and A-rod allows the plug to be retrieved using conventional drilling A-rods. After retrieval, standard-diameter (50.8 mm) observation wells can be installed within the hollow-stem augers. Testing of ESASS was conducted at one waste-disposal site with tetrachloroethylene (PCE) contamination and at two reference sites with no known waste-disposal history. All three sites have similar geology and are underlain by glacial, stratified-drift deposits. For the applications tested, ESASS proved to be a useful tool in vertical profil-ing of groundwater quality. At the waste site, PCE concentrations measured with ESASS profiling at several depths were comparable (relative percent difference <25%) to PCE concentrations sampled from wells. Vertical profiling with ESASS at the reference sites illustrated the vertical resolution achievable in the profile system; shallow groundwater quality varied by a factor of five in concentration of some constituents (nitrate and nitrite) over short (0.61 m) distances.
机译：美国地质调查局开发了一种名为ESASS（增强型筛螺旋钻采样系统）的新工具。 ESASS的使用由于其独特的美国专利设计（美国专利号7,631,705 Bl）而得以使用0.305-m的距离快速，高效地收集具有代表性的深度特定的地下水样品（垂直剖面）。中空螺旋钻期间的长筛螺旋钻。使用ESASS，筛网螺旋钻上方的刮板中的水柱通过特殊设计的可移动塞子和项圈与筛网螺旋钻中的水隔开。该工具可装入标准内径（82.55 mm）的螺旋钻内。由塞子，轴环和A型杆组成的系统的新颖设计允许使用常规的钻孔A型杆取回塞子。取回后，可以在空心柄螺旋钻中安装标准直径（50.8毫米）的观察井。 ESASS的测试是在一个有四氯乙烯（PCE）污染的废物处理场所和两个没有已知废物处理历史的参考场所进行的。这三个地点都具有相似的地质条件，并且都处于冰川，分层漂移的沉积物之下。对于测试的应用程序，ESASS被证明是对地下水水质进行垂直剖析的有用工具。在废物现场，通过ESASS分析在多个深度处测量的PCE浓度与从井中采样的PCE浓度相当（相对百分比差异<25％）。在参考点用ESASS进行的垂直剖面图说明了剖面系统中可达到的垂直分辨率。在短距离（0.61 m）内，某些地下水（硝酸盐和亚硝酸盐）的浓度降低了浅层地下水水质的五倍。

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  • 来源
    《Ground Water Monitoring & Remediation》 |2011年第1期|p.86-98|共13页
  • 作者

    Philip T. Harte; Sarah M. Flanagan;

  • 作者单位

    USGS NH/VT Water Science Center, 331 Commerce Way, Suite 2 Pembroke, NH 03275;

    USGS NH/VT Water Science Center, 331 Commerce Way, Suite 2 Pembroke, NH 03275;

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