本文总结了用于监测抽头处铅和铜水平的替代方案的开发。该指南基于对历史监测数据和现场研究结果的评估，并解决了样本可变性、样本库缩小和公用事业资源等问题。此外，还概述了州监管机构对LCR微小修订的解释，以及替代监测方法被接受的可能性。包括6个参考文献、表格、图表。

This paper summarizes the development of an alternative protocol for monitoring lead and copper levels at the tap. The guidelines are based on an evaluation of both historical monitoring data and field study findings and address issues of sample variability, shrinking sample pools and utility resources. In addition, a summary of state regulatory agency interpretation of the LCR Minor Revisions and the potential for acceptance for alternative monitoring approaches is presented. Includes 6 references, tables, figures.