Galva PWS Wells #3 and #4 Site

Site Background

The Galva Public Water Supply (PWS) Wells #3 and #4 site (site) is located on the southwest corner of Elizabeth and Main streets in Galva, McPherson County, Kansas. In March 1985, a statewide screening of PWS wells for volatile organic compounds (VOCs) detected carbon tetrachloride (CT) at a concentration of 160 micrograms per liter (µg/L) in PWS Well #4. The well was disconnected from the public water supply system, and has since been permanently plugged.

In December 1987, KDHE conducted a Preliminary Assessment of the Galva water supply. Sampling of three monitoring wells installed near PWS Well #4 indicated CT at 4.8 µg/L and tetrachloroethylene (PCE) at 1.6 µg/L in groundwater. Based on those results, KDHE conducted several investigations to identify the source and extent of the contamination. Subsequent analysis showed that PWS Well # 4 was the only impacted PWS well. A Site Investigation Report was completed in March 1996 that also identified nitrate as a contaminant of concern.

Water was pumped from PWS Well #4 to the Galva waste water treatment plant to hydraulically contain the VOC contamination. Monitoring of the groundwater indicated CT was decreasing, but nitrate remained at elevated levels. In summer 2003, KDHE identified spillage and inadequate secondary containment at a dry fertilizer storage structure as a nitrate source.

A nitrate assessment for soil and groundwater characterization was completed in 2005. Based on the results of the assessment, three source areas were excavated and backfilled with clean soils in January 2006. The excavated soils were land applied to area cropland.

CT and PCE have been successfully remediated. Nitrate has been the only contaminant of concern since 2009.

A 2011 Environmental Use Control (EUC) agreement for the dry fertilizer facility precludes residential use of the property, using onsite groundwater for human consumption, and rezoning. The owners also agreed to notify KDHE of any future removal of buildings, tanks, or utilities which previously hampered the removal of contaminated soil. KDHE may require soils underlying the structural impediments be tested to identify any hazards to human health and the environment from the newly exposed soil. Protective or remedial measures may be required based upon results of these tests.

The final Agency Decision Statement (ADS) identifies and defines remedial actions to date and is available for public review at the link below.

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