目前已准备好开始最终设计的地下水补给系统（GWRS）是奥兰治县水区（OCWD）和奥兰治县卫生区（OCSD）的联合项目。当所有阶段完成后，GWRS将成为世界上最大的先进循环水处理厂之一，每天处理OCSD 1号工厂产生的超过1.74亿加仑二级处理废水。高级水处理设施（AWTF）将包括微滤（MF）、反渗透（RO）、紫外线（UV）氧化和各种其他辅助设施，以取代OCWD现有的21号水厂（WF 21）。 AWTF的产品水将用于地下水补给和注入当地海水入侵屏障，而不是通过OCSD排水口将二级污水排入太平洋。该项目将提供一个新的、具有成本效益的、可靠的水源，并且无需建造额外的排水管。本文所述的基本处理工艺方案是在可行性/EIR阶段确定的。作为初步设计阶段的一部分，编制了31份技术备忘录，以彻底确定项目的详细技术基础。 初步设计于2000年12月完成。针对水质和水量、拆除和主要处理工艺，包括MF、RO、UV、泵站和化学品供给系统，制定了重要的AWTF标准。为确定每个AWTF结构的位置，编制了一份概念性现场平面图。最后，还确定了处理后产品水的分配系统，包括管道定线、排放设施和井位。估计可能的建筑成本约为3.52亿美元，运营和维护（O&M）成本从19美元到20美元不等。 700万到2380万。该项目将在11份不同的常规设计/投标/建造合同中建造。实施时间表预计，完整的治疗和输送系统将于2005年年中完成并投入运行。在就GWR系统的成本和必要性进行了大量辩论后，OCWD和OCSD联合董事会于2001年3月28日投票决定继续进行项目的设计和实施阶段。包括表格、数字。

The Groundwater Replenishment System (GWRS), currently ready to begin final design, is a joint program of the Orange County Water District (OCWD) and the Orange County Sanitation District (OCSD). The GWRS will be one of the largest advanced recycled water treatment plants in the world when all phases are completed, treating over 174 million gallons per day of secondary treated wastewater from OCSD's Plant No. 1. The advanced water treatment facilities (AWTF) will include microfiltration (MF), reverse osmosis (RO), ultraviolet (UV) oxidation, and various other ancillary facilities constructed to replace OCWD's existing Water Factory 21 (WF 21). The product water from the AWTF will be used for groundwater recharge and injection into the local seawater intrusion barrier, rather than discharging the secondary effluent into the Pacific Ocean through the OCSD outfall. The project will provide a new, cost-effective, reliable source of water and eliminate the need to construct an additional outfall pipe. The basic treatment process scheme, as related herein, was determined as during the feasibility/EIR phase. Thirty-one technical memorandums were prepared as part of the Preliminary Design phase to thoroughly define the detailed technical basis for the project. The preliminary design was completed in December 2000. Important AWTF criteria were developed for the water quality and quantity, demolition, and the major treatment processes, including the MF, RO, UV, pump stations and chemical feed systems. A conceptual site plan was prepared to locate each of the AWTF structures. Finally, the distribution system for the treated product water was also defined, including pipeline alignments, discharge facilities and well locations. The estimate of probable construction costs is about $352 million dollars, with operation and maintenance (O&M) costs ranging from $19.7 million to 23.8 million. The project will be constructed in 11 different conventional design/bid/build contracts. The implementation schedule projects the complete treatment and delivery systems to be completed and operational by mid 2005. After much debate as to the cost and necessity of the GWR System, the joint OCWD and OCSD Board of Directors voted on March 28, 2001, to proceed to the design and implementation phases of the project. Includes tables, figures.