Laserfiche WebLink
2015/2016 Data, Bedrock Aquifer <br /> <br />Colored shading = TCE <br />•Current concentrations up to <br />960 ppb in purple zone <br />(historical high 2100 ppb) <br />•Current concentrations in <br />yellow zone <10 ppb <br /> <br />1,4 -Dioxane (DX) <br />•Max DX on TCAAP: 280 ppb <br />•Max DX off -site: 60 ppb <br />(near TCAAP boundary) <br />•Inner purple contour=DX 10 ppb <br />•Outer purple contour=DX 1 ppb <br />•Most off -site concentrations <br />are between 1 and 10 ppb <br />•SAM wells straddle 1 ppb <br />contour (HRL = 1 ppb) <br /> <br /> <br />Off -Site Plume <br />Army is currently conducting an investigation to <br />determine extent of DX plume. <br />Remedial decision for on -site DX will be made <br />after investigation is complete. <br /> (existing TCE treatment plant does not remove DX) <br />Focus to date has been on DX treatment <br />systems for drinking water supplies. <br /> <br /> <br /> <br />1,4 -Dioxane – What’s Next? <br />29