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<oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
  <dc:contributor>Daniel J. Goode</dc:contributor>
  <dc:contributor>Thomas E. Imbrigiotta</dc:contributor>
  <dc:contributor>Michelle M. Lorah</dc:contributor>
  <dc:contributor>Claire R. Tiedeman</dc:contributor>
  <dc:creator>Allen M. Shapiro</dc:creator>
  <dc:date>2019</dc:date>
  <dc:description>&lt;p&gt;&lt;span&gt;Methanol&amp;nbsp;extractions for chloroethene analyses are conducted on rock samples from seven closely spaced coreholes in a&amp;nbsp;mudstone&amp;nbsp;aquifer&amp;nbsp;that was subject to releases of the&amp;nbsp;nonaqueous phase liquid&amp;nbsp;(NAPL) form of&amp;nbsp;trichloroethene&amp;nbsp;(TCE) between the 1950's and 1990's. Although&amp;nbsp;TCE&amp;nbsp;concentration in the rock matrix over the length of coreholes is dictated by&amp;nbsp;proximity&amp;nbsp;to subhorizontal&amp;nbsp;bedding planefractures, elevated TCE concentrations in the rock matrix are not continuous along the most permeable bedding plane fractures. A complex configuration of subvertical and subhorizontal fractures appears to be responsible for the TCE distribution from prior TCE releases at land surface. Phase partitioning calculations of TCE in the rock matrix show that most TCE is adsorbed to solid surfaces because of the large fraction of&amp;nbsp;organic carbon&amp;nbsp;(&lt;/span&gt;&lt;i&gt;f&lt;/i&gt;&lt;sub&gt;&lt;i&gt;oc&lt;/i&gt;&lt;/sub&gt;&lt;span&gt;) in the mudstone. Large TCE content in some cores indicate the likely presence of the&amp;nbsp;NAPL&amp;nbsp;form of TCE in the rock matrix. Using average values of porosity (&lt;/span&gt;&lt;i&gt;n&lt;/i&gt;&lt;span&gt;) and&amp;nbsp;&lt;/span&gt;&lt;i&gt;f&lt;/i&gt;&lt;sub&gt;&lt;i&gt;oc&lt;/i&gt;&lt;/sub&gt;&lt;span&gt;&amp;nbsp;in phase partitioning calculations identifies a number of locations of possible NAPL occurrence in the rock matrix. Samples of mudstone analyzed for&amp;nbsp;&lt;/span&gt;&lt;i&gt;n&lt;/i&gt;&lt;span&gt;&amp;nbsp;and&amp;nbsp;&lt;/span&gt;&lt;i&gt;f&lt;/i&gt;&lt;sub&gt;&lt;i&gt;oc&lt;/i&gt;&lt;/sub&gt;&lt;span&gt;&amp;nbsp;show variability in these properties over several orders of magnitude. Accounting for this variability in phase partitioning calculations identifies a probability of NAPL occurrence,&amp;nbsp;&lt;/span&gt;&lt;i&gt;P&lt;/i&gt;&lt;sub&gt;&lt;i&gt;NAPL&lt;/i&gt;&lt;/sub&gt;&lt;span&gt;. The&amp;nbsp;spatial variability&amp;nbsp;of&amp;nbsp;&lt;/span&gt;&lt;i&gt;P&lt;/i&gt;&lt;sub&gt;&lt;i&gt;NAPL&lt;/i&gt;&lt;/sub&gt;&lt;span&gt;&amp;nbsp;along coreholes identifies a configuration that may be attributed to a TCE source zone that has evolved after&amp;nbsp;emplacement&amp;nbsp;due to NAPL dissolution, adsorption, and matrix diffusion.&lt;/span&gt;&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1016/j.jconhyd.2019.04.001</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Elsevier</dc:publisher>
  <dc:title>The complex spatial distribution of trichloroethene and the probability of NAPL occurrence in the rock matrix of a mudstone aquifer</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>