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MTBE Source Investigations
EPA and the Regional Water Board initially identified thirty (30) potential MTBE source facilities within an approximately 1.25 mile radius of the City's Charnock Wellfield. Two of the potential source facilities were gasoline pipelines, and 28 of the potential source facilities were underground storage tank systems ("USTs") where gasoline had been or was being stored.
Some of the documents listed below are available in PDF format.
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| Potential MTBE Source Sites (PRP Sites) (PDF) (1pp, 75K, About PDF) |
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Sources with a history of leaks were required to investigative soil and groundwater to determine if the sites had MTBE. Sites without a history of leaks were required to conduct soil gas investigations initially, and based on the results of the investigation, could be required to investigate soil and groundwater. (Right) Drilling of a monitoring well at Site 1. |
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The results of these site investigations showed that 25 of the sites investigated had had releases of gasoline containing MTBE. Of these, EPA has found that 12 sites have polluted the groundwater with MTBE. (Right) View the preliminary results of the source investigations. |
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In addition to facilities that may have managed MTBE, the Source Water Assessment Report, prepared by Shell Oil Company's consultant, identified numerous facilities with potential polluting activities within the estimated 25 year capture zone of the Charnock wells. (Right) Map from Source
Water Assessment Report depicting potential polluting sources (PDF)
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Links with this symbol 
next
to them are documents submitted to EPA on behalf of Potentially
Responsible Parties. These documents are part of the public
record for the project, however, EPA does not guarantee the accuracy
of these documents.