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TREE SAMPLING AS A METHOD TO ASSESS VAPOR INTRUSION POTENTIAL AT A SITE CHARACTERIZED BY VOC-CONTAMINATED GROUNDWATER AND SOIL
Wilson, J.L., M.A. Limmer, V.A. Samaranayake, J.G. Schumacher, and J.G. Burken.
Environmental Science & Technology 51(18):10369-10378(2017)

Regression models were developed to assess the relation between PCE concentrations in 500-plus tree-core samples with PCE concentrations in 50 groundwater and 1000 soil samples collected from a PCE-contaminated Superfund site. Results from sample analysis using gas chromatography indicate that in planta concentrations are significantly and positively related to PCE concentrations in groundwater samples collected at depths < 20 m and in soil samples. A sampled tree 30 cm in diameter indicated soil concentrations at depths < 6 m over an area of 700-1600 m2, the volume of a typical basement. The findings illuminate the potential of the tree sampling method for detecting contamination at shallow depths at sites with suspected vapor intrusion issues.



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