1988年，西雅图水务公司与美国填海局共同启动了一个示范项目，以评估Highline井场含水层储存和回收（ASR）项目的可行性。Highline ASR项目的设计目的是在低需求期，用Cedar河的氯化未过滤地表水对中间含水层进行人工补给，然后在夏季旺季回收水。1994年发布了一份最终报告。在示范项目期间，在井口采集了水质样本，以描述天然地下水、补给水和恢复阶段产生的水的特征。

In 1988, Seattle Water initiated a demonstration project in conjunction with the US Bureau of Reclamation to evaluate the feasibility of an aquifer storage and recovery (ASR) program at the Highline well field. The Highline ASR program is designed to artificially recharge the intermediate aquifer with chlorinated, unfiltered surface water from the Cedar River during low demand periods, and then recover water during the peak summer season. A final report was released in 1994. Water quality samples were collected during the demonstration project at wellheads to characterize the native groundwater, recharge water, and water produced during the recovery phase.