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50 WORKPLAN FOR FUTUREVIACTIVITIES <br /> Based on the results of ground water sampling performed at the site, <br /> natural biodegradation of TPH-g and BTEX compounds is occurring at <br /> each former UST site To further evaluate the use of enhanced <br /> biodegradation at the site, ERM will perform ground water sampling to <br /> determine biodegradation characteristics If the results of this ground <br /> water sampling event indicate that the conditions for biodegradation will <br /> continue at the site, ERM will implement enhanced biodegradation <br /> through the injection of ORC at locations surrounding each former UST <br /> location Following ORC injection, ERM will implement a ground water <br />' sampling program to monitor the biodegradation of TPH-g and BTEX in <br /> ground water at each former UST site The following subsections present <br /> a workplan and schedule for perforrrung baseline ground water sampling, <br /> infection of ORC, and tracking of biodegradation of TPH-g and BTEX in <br /> ground water <br /> 5.1 BASELINE GROUND WATER SAMPLING <br /> To demonstrate biodegradation is continuing to occur in ground water at <br /> each former UST location, ERM will perform ground water sampling at <br />' the site Ground water samples will be collected and analyzed for <br /> biodegradation indicator compounds The indicator compounds consist <br /> of electron acceptors (dissolved oxygen, nitrate, and sulfate) and <br />' metabolic byproducts (dissolved iron, dissolved manganese, and <br /> methane) <br />' ERM will collect ground water samples from monitoring wells located <br /> inside and outside of the hydrocarbon ground water plume at each former <br />' UST location Samples collected from monitoring wells upgradient of the <br /> hydrocarbon ground water plumes will be used to determine the <br /> background concentrations of indicator compounds Samples collected <br />' from within the hydrocarbon ground water plumes will be used to <br /> evaluate the concentrations of indicator compounds within the <br />' hydrocarbon ground water plumes If biodegradation is occurring, the <br /> concentrations of electron acceptors within the hydrocarbon ground water <br /> plumes should be less than in the upgradient ground water Similarly, the <br />' concentrations of metabolic byproducts should be greater in the <br /> hydrocarbon ground water plumes than in the upgradient ground water <br />' 14 <br />