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SECTION 1.0 INTRODUCTION <br /> Water table elevation data were evaluated using AgtesolyT1111 groundwater software to estimate the <br /> hydraulic conductivity for the water-bearing zone screened in each respective monitoring well <br /> Hydraulic conductivity estimates were then used to estimate the groundwater velocity <br /> Task 4—Estimation of Petroleum Hydrocarbon Mass in Soil and Groundwater <br /> As part of the data evaluation, the vertical and horizontal extent of petroleum hydrocarbons in <br /> groundwater, based on groundwater monitoring data from the March/Apnl 1999 groundwater <br /> monitoring event and the discrete vertical groundwater sampling, was estimated In addition, the <br /> historical soil analytical data were depicted horizontally and vertically to evaluate the extent of <br /> petroleum hydrocarbons in soil These data were used to estimate the mass of petroleum <br /> hydrocarbons in soil and groundwater <br /> Task 5 —Natural Attenuation Evaluation <br /> Natural attenuation of TPH-g and benzene were evaluated using current and historical <br /> groundwater monitoring data, inorganic analyses (nitrate and sulfate), and water quality <br /> parameters (pH, conductivity, and dissolved oxygen) <br /> Task 6 —Additional Groundwater Study Report <br /> Task 6 included the generation of this report to document the results of the discrete vertical <br /> groundwater sampling, review of groundwater wells within 500 feet, and evaluation of <br /> petroleum-hydrocarbon mass and natural attenuation at the site (The Human Health Rask <br /> Assessment and Groundwater Impact Analysis, and the evaluation of potential remediation <br /> alternatives will be completed as separate reports) <br /> i <br /> i <br /> r <br /> 5 IPROJ14104010d0415YYARrnlNAINTYARUSa00C 1-4 URS Greiner Woodward Clyde <br />