1998年，底特律供水和污水处理部（DWSD）将CS-1305合同授予Tetra Tech MPS（作为首席监督顾问），以 在其五个水处理厂中的四个（不包括）开发残余沉积物处理设施的设计基础 水务工程公园WTP），并在采购和施工期间协助该部门 本合同的各个阶段。 估算废反洗和沉淀污泥的方法见 本文。此外，休伦湖残留物处理设施的设计基础 讨论了水处理厂和西南水处理厂。 包括表格、图表。

In 1998, the Detroit Water and Sewerage Department (DWSD awarded Contract CS-1305 to Tetra Tech MPS (as lead oversight consultant) to develop the basis of design for residuals treatment facilities at four of its five WTPs (excluding Water Works Park WTP), and to assist the Department during the procurement and construction phases of this contract. The methodology for estimating the spent backwash and sedimentation sludge is presented in this paper. In addition, the basis of design for the residuals treatment facilities at the Lake Huron WTP and Southwest WTP are discussed. Includes tables, figures.