Waters Introduction (1)

Waters Introduction (1) - the geochemical properties of a...

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Daphanee Waters Introduction A lot of times natural attenuation monitoring (NAM) is initiated at a site without a geochemical evaluation of an aquifer. As a result, a site could be in NAM for years and could be very costly for clients. This paper will look at a site, El Jobean, where the contaminant concentrations are below the required levels for active remediation. Therefore, NAM would be the typical course of action. After several quarters of monitoring the surficial aquifer, there was no decrease in contaminant concentrations. Therefore, a geochemical evaluation was conducted to determine if the site is conducive to NAM. For NAM to be effective, aerobic biodegradation must be present. The geochemical parameters tested for aerobic biodegradation include terminal electron acceptors (TEA) such as, but not limited to, dissolved oxygen (DO), nitrate, iron, and sulfate. The parameters were tested and ran through a PHREEQC analysis which allowed us to determine if the surficial aquifer is under reducing or oxidizing conditions. This paper compares
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Unformatted text preview: the geochemical properties of a groundwater sample collected from an impacted well on the property versus a groundwater sample from a non-impacted well. The results of the testing will clearly indicate that the impacted well was under reducing conditions. Therefore NAM would not be effective at El Jobean. To encourage NAM, oxygen must be added to the aquifer. The technology used at El Jobean is a slow-release oxygen compound. The second part of this paper will be to model the contaminants in the surficial aquifer as a slow-release oxygen compound is added. Based on the characterized geochemistry of El Jobean, PHREEQC will be used to predict the effectiveness of the slow-release oxygen compound into the aquifer. The results of this study will show that El Jobean was able to transition into an oxidizing environment. This is conducive to NAM, therefore the overall contaminant mass concentrations significantly reduced....
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This note was uploaded on 02/27/2012 for the course GEOL 33 taught by Professor E during the Spring '12 term at University of South Florida.

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