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Field comparison of paired direct push and HSA wells

机译：成对的直推井和HSA井的现场比较

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This study was conducted to determine if prepacked screen direct push (DP) permanent monitoring wells provide representative water quality samples. A total of eight sets of paired DP and hollow stem auger (HSA) monitoring wells were installed in a silty to sandy alluvial aquifer. The paired wells were sampled for several chlorinated volatile organic compounds (X-VOC) over nine months. Linear regression showed that removal of a single erratic data pair yields a correlation coefficient (r~2) of 0.914 for the X-VOCs. Field parameters (pH, specific conductance, water levels) for the paired wells show strong correlation. Z-test of the X-VOC data from the paired wells indicates no statistically significant diffeence between the HSA and DP data. The non-parametric Wilcoxon Signed Pank test indicates no statistically significant difference between the DP and HSA wells for ten of the tewlve analyte-well pair combinations tested. For the parameters investigated, the results of the statistical analyses indicate that the DP wells provide representative water quality samples. These results, the low cost, and case of installation make the DP wells an attractive alternative for many groundwater monitoring investigations.
机译：进行这项研究是为了确定预装的筛网直推式（DP）永久监测井是否可提供代表性的水质样品。总共将八对成对的DP和空心钻杆（HSA）监测井安装在粉质至沙质冲积含水层中。在9个月的时间里，对配对的井取样了几种氯化挥发性有机化合物（X-VOC）。线性回归表明，删除单个不稳定的数据对可得出X-VOC的相关系数（r〜2）为0.914。配对井的现场参数（pH，比电导，水位）显示出很强的相关性。来自配对孔的X-VOC数据的Z检验表明，HSA和DP数据之间没有统计学上的显着差异。非参数Wilcoxon Signed Pank检验表明，对于十个测试的全部分析物-孔对组合，DP和HSA孔之间没有统计学上的显着差异。对于所研究的参数，统计分析结果表明，DP井可提供代表性的水质样品。这些结果，低成本和安装案例使DP井成为许多地下水监测研究的有吸引力的替代方案。

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