Title
Manufactured Gas Plant Remediation Update (B)
The latest Manufactured Gas Plant Remediation soil sampling and test burn results indicate a need to revisit the remediation alternatives, and staff recommends proceeding with the lower cost, shorter schedule remediation alternative.
Explanation
Initial thermal treatment verification burn results received in June 2008 indicated that the thermal treatment facility was only able to obtain about half the estimated plant throughput rates and was not able to meet the residential treatment standards without re-treating the material. If these results were representative of the overall site, then this would have significant cost and schedule impacts to the remediation project. Staff recommended collecting and analyzing additional soil samples from throughout the site to better characterize its thermal treatment parameters. Twenty-five additional soil samples were collected in mid-August and the results were modeled by a thermal treatment consultant to determine the estimated average throughput.
The results of these analyses and computer modeling indicate that thermal treatment would not be practical or economical for a significant portion of the site's contaminated soil volume due to the soil characteristics, including heat content, total organic carbon, moisture and contaminant concentration. Therefore two final alternatives were considered: 1) A combination of thermal treatment and landfill and 2) landfill only. Due to the significant savings in cost and time, the staff recommendation is Alternative 2 - Landfill.
Recommendations
The City Commission 1) hear presentations from GRU Staff on the latest Manufactured Gas Plant Remediation soil sampling results and the revised costs and schedule of alternatives based on these results and 2) approve the staff recommended alternative of landfill disposal for proceeding with the remediation.
Fiscal Note
This project is to be funded by the GRU-Gas Util...
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