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The Remedial Action schedule will be developed and submitted for approval as part of the RD report. One written comment was received through the mail. Concerns focused on air and water quality, especially as they relate to public health, and the timeline for the closure of Northside.
A toxic oil spill in mid, caused by vandals and believed to come from tanks stored on neighboring Great Lakes Asphalt Company property, caused intensified public concern about the effects of site-related contaminants in the community. At the time, it was believed the spill could have some effect on the Eagle Creek Reservoir, from which part of Indianapolis draws drinking water.
The spill was cleaned up under EPA's emergency authorities. The resident expressed concern that any contaminated leachate will not be separated and treated before being commingled with domestic effluent when discharged to the Indianapolis wastewater treatment system.
The resident believes that Indianapolis cannot handle the type of waste it will receive from Northside, resulting in a situation where contaminants will enter the White River. EPA's response: Allowing contaminated leachate and ground water from Northside to be treated by the Indianapolis wastewater treatment system was carefully and thoroughly examined.
The Administrative Record contains a great deal of information on this subject, some of which was prepared by EPA's contractor, and some of which was submitted to us by the City of Indianapolis.
We examined the requirements for discharges into the City of Indianapolis wastewater collection and treatment system. We believe that the Indianapolis treatment plant can effectively remove the contaminants from Northside leachate and ground water. A eminent was made at the meeting suggesting EPA should put the pipeline on the west side of Highway EPA's response: The location of the pipeline has not yet been determined.
This is a design detail that will be worked out with the rest of the design at a later date. Two comments were made at the meeting suggesting EPA needs a method to isolate the uncontaminated ground water from the north and east from the contaminated leachate and ground water that will be collected and treated; an isolation system on the north and east sides of the site was suggested. However, based on our study of the regional ground water flow in the area, we concluded this is not necessary because the regional ground water from the north and east appear to be naturally isolated from the contamination.
We believe that the regional ground water does not enter the site from the east. Furthermore, we believe that regional ground water flow from the north is deep, and goes under the site. Because it is deep, it will not become contaminated by the waste, and will not enter the collection system. All the contamination we have seen is in the shallow ground water; the deeper regional ground water is uncontaminated.
In addition, in the shallow aquifer, there is an upward gradient, which means that flow is upward, so contamination cannot move downward from the shallow glacial till aquifer into the deeper uncontaminated aquifer. A comment was made at the meeting suggesting EPA have continuous monitoring of the leachate system. EPA's response: All dischargers to a municipal sewer system must perform monitoring on the material they are providing to the sewer system.
The Northside discharge will be no different. The way monitoring will be conducted, whether continuous or on some interval, will be determined during the design of the project, and will depend, in part, on City of Indianapolis requirements.
For further information, the reader is referred to the Administrative Record and the public information repository at the Zionsville Town Hall, S. I wish to enter the following additional comment. Though I spoke on the subject in the form of a question in the meeting, I am entering this comment in written form as this allows me to work carefully on the exact wording.
Comment: It concerns me that the proposed ROD will remove the burden of separation and treatment of any contaminated leachate which will be extracted from the ground. By piping this leachate to the North- western corner of the Indianapolis wastewater treatment system, and allowing it to commingle with the domestic effluent of hundreds of thousands of other customers," it will be diluted far beyond the point that it can be effectively treated.
This, coupled with the fact that neither of the Indianapolis treatment plants provide treatment facilities for industrial chemical wastes, leads me to believe that all we are really changing is the place at which the contaminated leachate enters the waters of the United States, that change being from the local aquifer to White River. Thanks for so offering. Sincerely, Philip L.
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