Structural/Geotechncial Engineering Evaluation of the McMillan Filter Site (2000) – according to this study, the current condition of the underground cells on the McMillan site fall into three categories: 1) Type I – unstable/unsafe; 2) Type II – stable, except at edges; and, 3) Type III – stable. This report states that 12 of the 20 cells are either Type II or Type III while 8 cells are Type I. The cost to preserve cell types II and III are: $2,020,000 and $1,790,000, respectively per cell if used for open space; $2,250,000 and $2,020,000, per cell if developing a one-story structure; $2,560,000 and $2,330,000 per cell if developing a four-story structure. The cost to demolish and fill the cells is approximately $1.0 to $1.5 million less per cell; however, the method of fill in described in this report does not mirror the current Vision McMillan Partners plan for demolishing the cells. That cost is currently unknown.
Cell Preservation Costs and Stability