三个污染源导致了地下水质量 对新墨西哥州交通部（NMDOT）拉斯维加斯服务的影响 中心位于新墨西哥州拉斯维加斯。地下储罐漏水 配水管道和以前未加衬里的盐渍煤渣仓库已受到污染 含有石油烃、1,1,1-三氯乙烷（TCA）和总烃的地下水 分别为溶解固体（TDS）。羽流在源区是明显的，但 混合下降梯度。浅海含水层的低渗透性 由于生产率较低，因此无法通过井开采地下水。 这个 混合污染物的性质和地下的低渗透性也受到了影响 在选择提取和非原位处理补救措施时考虑 受污染的地下水。因为沟渠更容易接触污染物流 通道（裂缝和层面）比单井或多井、沟槽为基础 对双相萃取（DPE）进行了中试，以评估其显著脱水a的能力 更大的地下体积，并提供更高的地下水开采率 而不是开采井。在一周的试验中，DPE达到稳定状态 地下水抽取率约为2。 每分钟5加仑（gpm）。这 抽水速率代表的是地下水的平均抽取速率，是was的10倍 可通过之前的多井地下水开采系统实现。包括表格、数字。

Three sources of contamination have resulted in groundwater quality impacts at the New Mexico Department of Transportation (NMDOT) Las Vegas Service Center in Las Vegas, New Mexico. Leaking underground storage tanks, leaking distribution piping, and formerly unlined, salted cinder storage have contaminated groundwater with petroleum hydrocarbons, 1,1,1-trichloroethane (TCA), and total dissolved solids (TDS), respectively. The plumes are distinct at the source areas, but commingle downgradient. The low permeability of the shallow water-bearing zone makes groundwater extraction via wells impractical due to low production rates. The nature of the commingled contaminants and low permeability of the subsurface, were considered in the selection of an extraction and ex-situ treatment remedy for contaminated groundwater. Because a trench has greater access to contaminant flow pathways (fractures and bedding planes) than a single, or multiple wells, trench-based dual phase extraction (DPE) was piloted to evaluate its ability to dewater a significantly larger volume of the subsurface, and to provide a higher groundwater production rate than extraction wells. During a 2-week pilot test, the DPE trench achieved a steady state groundwater extraction rate of approximately 2.5 gallons per minute (gpm). This pumping rate represents an average groundwater extraction rate 10 times greater than was attainable with the previous multi-well groundwater extraction system. Includes tables, figures.