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Longfellow Koehler Project <br /> Page 4 <br /> results from parameters monitored for design of the system will be included in the design report given <br /> to WQCD. <br /> Part of the design will include a monitoring program that can be used to determine metals <br /> reduction. The following will be considered in the design of the passive bio treatment system: <br /> (1) Volume of water to be treated. High and low flow characteristics. <br /> (2) Water temperature, pH and hardness. <br /> (3) Metal loadings and precipitation characteristics. <br /> (4) Retention time for passive system to react and deposit metals. <br /> (5) Life of passive treatment cell. <br /> (6) Seventy percent dissolved metals reduction from the pro-ject site. <br /> (7) Plan for replacement of the passive bio treatment mass. <br /> (8) Character of spent material. <br /> (9) Designed to operate with the simplest and least frequent operation and maintenance <br /> requirements. <br /> (10) Climate and access. <br /> Work Plan <br /> 1996 <br /> (1) Evaluate baseline water quantity and quality at M-2, portals and other seeps. <br /> (2) Collect and benchscale test for passive bio treatment systems. <br /> (3) Open portals for evaluation of discharge conditions. <br /> (4) Determine quantity and quality to be treated by passive bio treatment system. <br /> (5) Examine surface subsidences for run on control. <br /> (6) Design run on control practices. <br />