Hydrogeological characterization is required when investigating contaminated sites, and hydraulic conductivity is an important parameter that needs to be estimated. Before groundwater sampling, well water level values are measured during low-flow purging to check the correct driving of the activity. However, these data are generally considered only as an indicator of an adequate well purging. In this paper, water levels and purging flow rates were considered to estimate hydraulic conductivity values in an alluvial aquifer, and the obtained results were compared with traditional hydraulic conductivity test results carried on in the same area. To test the applicability of this method, data coming from 59 wells located in the alluvial aquifer of Malagrotta waste disposal site, a large area of 160 ha near Rome, were analyzed and processed. Hydraulic conductivity values were estimated by applying the Dupuit’s hypothesis for steady-state radial flow in an unconfined aquifer, as these are the hydraulic conditions in pumping wells for remediation purposes. This study aims to show that low-flow purging procedures in monitoring wells—carried out before sampling for groundwater characterization—represent an easy and inexpensive method for soil hydraulic conductivity estimation with good feasibility, if correctly carried on.

中文翻译：

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在污染场地使用低流量吹扫数据进行水力传导率估算

调查受污染场地时需要进行水文地质特征描述，而水力传导率是一个需要估算的重要参数。在地下水采样之前，在低流量清洗期间测量井水位值，以检查活动的正确驱动。然而，这些数据通常仅被认为是充分吹扫井的指标。在本文中，考虑水位和清洗流量来估计冲积含水层的水力传导率值，并将获得的结果与在同一地区进行的传统水力传导率测试结果进行比较。为了测试该方法的适用性，对来自位于罗马附近 160 公顷大面积 Malagrotta 废物处理场冲积含水层的 59 口井的数据进行了分析和处理。通过应用 Dupuit 对无承压含水层中稳态径向流的假设来估计水力传导率值，因为这些是用于修复目的的泵井中的水力条件。本研究旨在表明监测井中的低流量吹扫程序——在采样地下水表征之前进行——代表了一种简单且廉价的土壤水力传导率估算方法，如果正确进行，具有良好的可行性。