随着第一阶段消毒剂/消毒副产品（D/DBP）规则的颁布 随着未来第2阶段D/DBP规则的颁布，公用事业公司面临着选择的挑战 代表高三卤甲烷最坏情况的配电系统站点 （THM）和卤乙酸（HAA）浓度，消毒剂残留量的高低，以及 水力停留时间的范围。美国环境保护局（USEPA）最近制定了一份指导手册，以帮助 公用事业公司选择其配电系统站点进行初始配电系统评估 （IDSE）。 我们的团队目前正在进行一个AwwaRF研究项目，该项目研究影响因素 实际配电系统条件下DBP的形成和衰减。而 美国环保局IDSE指南手册旨在帮助公用事业公司全面选择DBP监测点 在配电系统中，我们的研究集中在相对较小的系统面积上，以允许 几种DBP形成和衰变影响因素的综合研究 （THMs、哈斯、NDMA）。因此，我们项目的第一步是选择一位将军 每个公用设施的配电系统区域。 确定配电系统区域后，进行建模 计算与每个节点相关的水力停留时间（水龄） 分布区。然后根据水龄和其他水力参数选择监测点 以及水质参数。五家地理分布广泛的公用事业公司参与了我们的项目。 本文概述了影响配电系统的法规，并描述了 详细介绍了使用的方法以及影响配电系统选址的因素 用于根据阶段2 D/DBP规则监测THM和HAA。 包括数字。

With the promulgation of the Stage 1 Disinfectant/Disinfection Byproduct (D/DBP) Rule and the future promulgation of the Stage 2 D/DBP Rule, utilities are facing the challenge to select distribution system sites representative of worst-case conditions in terms of high trihalomethane (THM) and haloacetic acid (HAA) concentrations, high and low disinfectant residuals, and a range of hydraulic residence times. The US Environmental Protection Agency (USEPA) recently developed a Guidance Manual to help the utilities select their distribution system sites for the Initial Distribution System Evaluation (IDSE). Our team is currently working on an AwwaRF research project that studies factors affecting formation and decay of DBPs under actual distribution system conditions. While the goal of the USEPA Guidance Manual for IDSE is to help utilities select DBP monitoring sites in a full-scale distribution system, our study focuses on a relatively small area of the system to allow a comprehensive investigation of the factors affecting the formation and decay of several DBPs (THMs, HAAs, NDMA). Thus, the first step of our project consisted of selecting a general distribution system area for each utility. Once a distribution system area was identified, modeling was conducted to calculate the hydraulic residence time (water age) associated with each node in the distribution area. Monitoring sites were then selected based on water age and other hydraulic and water quality parameters. Five geographically-spread utilities are participating in our project. This paper provides an overview of the regulations affecting distribution systems, and describes in detail the methodology used and the factors affecting the selection of distribution system sites used to monitor for THMs and HAAs under the Stage 2 D/DBP Rule. Includes figures.