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i <br /> Iport has been installed into each well cap <br /> In order to obtain more accurate measurements of carbon dioxide and oxygen <br /> concentrations in each well, GeoAudit proposes to make the following modifications to the <br /> blower system <br /> 1 Oxygen (air) will be injected at the bottom of each well. Small diameter (1- <br /> inch or less) PVC pipe will be attached to the current system and will provide <br /> oxygen to the bottom of each well In the case of MW-14, the oxygen will be <br /> injected beneath the groundwater (i a air sparging) The PVC in MW-14 will <br /> be removable to allow for groundwater sample collection <br /> 2) Oxygen and carbon dioxide samples will be collected from the bottom of each <br /> well sampled. Samples will be collected in the field using oxygen and carbon <br /> dioxide meters via plastic tubing from the bottom of each well <br /> 3) The blower will be turned off prior to collection of vapor samples. Based <br /> upon data collected during the pilot study from VW-1 and VW-4, more <br /> representative (closer to predicted values)vapor readings were collected when <br /> the blower was either not providing air to the well (VW-1) or was not <br /> operating prior to sample collection (VW-4, 2-17-94 and 3-7-94) <br /> Oxygen and carbon dioxide samples will be collected after the blower has <br /> been turned off for a minimum of 24 hours This should allow time for the <br /> vapor levels in each well to "stabilize" and provide more accurate <br /> Erepresentations of vapor concentrations <br /> 4) Air sparging using MW-14. Oxygen will be provided to MW-14 beneath the <br /> Igroundwater table, effectively using MW-14 as an air sparging well This <br /> should provide oxygen to the groundwater up-gradient of the center of the <br /> impacted groundwater plume and enhance the biodegradation system <br /> Each quarter the blower system will be analyzed for effectiveness Some additional changes <br /> I being considered by GeoAudit include "pulsing" of oxygen, additional sparging wells and air <br /> flow reversal prior to sampling If additional changes are considered, the modifications will <br /> be outlined in future quarterly reports <br /> 4.0 BIOREMEDIATION MONITORING <br /> GeoAudit recommends the following bioremediation monitoring program This program <br /> should replace the original monitoring program outlined in the FRP and the pilot study <br /> monitoring program <br /> I <br /> G-bV-1 Audi s.� 1- <br /> 6 <br /> 137Kkw-6n hnKy4 <br />■ <br />