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DEQ technical analysis: model predicts limited saltwater intrusion risk; council urged to monitor chloride
Summary
A DEQ technical briefing outlined Eastern Shore aquifer layers and modelled impacts of withdrawals; while the model did not predict a meaningful saltwater intrusion risk to town wells, presenters recommended voluntary chloride monitoring and cautioned the model estimates trends rather than precise outcomes.
Town officials and residents heard a technical briefing on groundwater resources and saltwater intrusion risk for the town's wells. The presentation described four principal sand/aquifer layers (the Columbia/Surficial aquifer and three Yorktown–Eastover units), explained how freshwater lenses sit atop salt water, and summarized USGS/DEQ model results indicating limited predicted impacts to the town's existing wells.
The presenter emphasized the model's limitations: "It is not able to accurately predict, if saltwater intrusion can occur," an agency official said, noting the model is useful for identifying trend direction and relative risk. Panelists recommended establishing a chloride monitoring program at town wells so early signs of saltwater intrusion would be detected quickly. Residents asked whether large nearby withdrawals (for example at Purdue or large nurseries) are monitored; the presenter replied those larger permittees are monitored and sometimes required to install additional monitoring wells.
