该厂于1994年进行了升级，以满足当前加州地表水处理规则，并对工艺元件进行了修改，以提高运行效率。本文论述了场地开发、水力分析、工艺改进，以及在改进施工过程中出现的意外问题。工艺改进包括添加新的双介质过滤器、修改管道以符合消毒要求、新的污泥处理和处理系统、其他工艺改进，以及添加新的湖内曝气系统。本文描述了这些修改以及为“使鞋子合脚”而克服的具体挑战。 “该项目不仅在技术上可行，而且在经济上也可行。新的过滤器紧密地安装在现场，具有足够的液压头，以实现高效运行。其他工艺改进为现有工厂提供了经济有效的升级。该项目为该区提供了DOHS可接受的设施，用于处理峡谷湖原水，同时保持l未来的选择是开放的。

The plant was upgraded in 1994 to meet current California Surface Water Treatment Rule, and process elements were modified to make the operation more efficient. This paper addresses site development, hydraulic analysis, process improvements, and unexpected problems that developed during the construction of the improvements. Process improvements include addition of new dual media filters, modification of piping for disinfection compliance, new sludge handling and treatment system, other process improvements, and the addition of a new in-lake aeration system. This paper describes these modifications and the specific challenges that were overcome to "make the shoe fit." This project is not only technically viable, but also economically feasible. The new filters fit snugly on the site with adequate hydraulic head for efficient operation. The other process improvements provide an affordable and effective upgrade to an existing plant. This project provides the District with facilities acceptable to DOHS for treating the Canyon Lake raw water while also keeping all options open for the future.