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Geosyntec" <br /> well. As part of this evaluation, air entry pressure will be tested at each location. This testing will <br /> be accomplished by gradually increasing injection pressure in small increments and monitoring <br /> the corresponding injection flow rates and DO concentrations in the nearby observation wells. <br /> These data will be used to fine-tune sparge operation. The pilot test startup phase is anticipated to <br /> last approximately two to four weeks. <br /> During startup, DO and water level measurements from the observation wells will be used to <br /> evaluate the ZOI and groundwater flow direction. DO concentrations in the observation wells will <br /> be monitored multiple times daily using a multi-parameter probe to evaluate the effects of the <br /> sparge fine-tuning process. In addition, level transducers will be deployed in the observation wells <br /> to collect water level measurements continuously to evaluate mounding effects from sparging. <br /> After the startup period, DO and water levels will be measured weekly for the first month. If <br /> additional operational changes are made during this period, supplemental DO and water level <br /> measurements may be collected. Other groundwater parameters and analytes will be monitored as <br /> described in the monitoring plan, presented in Section 5, to evaluate the effectiveness of the <br /> biosparge system at reducing sulfolane concentrations in target groundwater. <br /> Further optimization of the pilot tests may be needed periodically as data are received and <br /> evaluated throughout the duration of the pilot tests. <br /> 4.2.2.3 Pilot Test Operation and Maintenance <br /> The pilot tests are intended to be operated for only as long as necessary to demonstrate ISB and to <br /> collect data necessary for full-scale design. ISB duration may be extended at one or all locations <br /> to evaluate the need for optimization, to collect additional data for full-scale design, and/or to <br /> continue with sulfolane treatment while full-scale design, permitting and implementation is <br /> undertaken. <br /> The biosparge system will be operated and maintained in general accordance with the USACE's <br /> guidelines for Air Sparging (USACE, 2013). Air pressure, flow rates, and temperature will be <br /> periodically monitored to ensure project objectives are achieved. Equipment will be periodically <br /> inspected and maintained according to manufacturer recommendations. <br /> Well fouling due to siltation, precipitation of dissolved constituents and/or biomass accumulation <br /> may be a concern during pilot testing. Flow rates and pressures will be monitored daily for <br /> evidence of well fouling. As needed,the biosparge injection wells will be redeveloped to maintain <br /> air delivery rates. <br /> In-Situ Bioremediation Pilot Test Work Plan—GSH Lathrop I I <br />