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Geosyntec <br /> consultant~ <br /> All drilling waste will be collected and temporarily stored on-Site in appropriate sized and labelled <br /> containers. Following waste characterization,the soil cuttings and drill mud will be disposed at an <br /> approved off-Site waste disposal facility by a licensed waste hauler. Water generated during well <br /> installation and development will be allowed to settle and treated through the existing groundwater <br /> system at the Site. <br /> 4.2.Z5 Surveying <br /> Following the installation and development of the new wells, the northing, easting, and top of <br /> casing for each new well will be surveyed by a California licensed land surveyor. <br /> 4.2.2 Biosparging Equipment and Approach <br /> 4.2.2.1 Proposed Biosparge Equipment <br /> Due to access constraints, a separate trailer-mounted sparge system will be located at each PTA. <br /> Based on the expected oxygen demand from groundwater constituents,current groundwater levels <br /> and Site geology, the sparge systems will be sized to supply flow rates between 1 and 5 standard <br /> cubic feet per minute(scfm)at pressures of up to 150 pounds per square inch (psi). The flow rates <br /> are anticipated to be sufficient to achieve a 25-foot ZOI, and the pressures are anticipated to be <br /> sufficient to overcome the head pressure from the existing groundwater column in the area. <br /> Initially, atmospheric air will be injected to promote ISB for the pilot study. If this is found to <br /> provide sufficient oxygen content to achieve the required degree of sulfolane biodegradation,then <br /> the pilot tests will continue solely with air injection. However, if the oxygen demand posed by the <br /> groundwater geochemistry exceeds what can be delivered by air injection alone, then oxygen- <br /> enriched air will also be injected. In this case, an oxygen generator and pressure booster (if <br /> required) will be used together to deliver oxygen-enriched air in place of biosparging using <br /> atmospheric air. Depending on available capacity at the existing BSW and PSW power panels, <br /> each sparge trailer will either be powered from the respective panels, or by a generator for the <br /> duration of the pilot test. <br /> A manifold and high-strength flexible hosing will be used to connect the sparge system to each <br /> sparge well.The conveyance piping may be buried or above-ground depending on property owner <br /> preference and the presence of utilities or obstructions in the vicinity of the sparging equipment <br /> and sparge wells. All conveyance piping will be sized adequately to minimize flow restrictions <br /> and pressure losses, and sampling ports will be installed downstream of the sparge unit. The <br /> manifold will be equipped with a valve to regulate flow, a flow meter and a pressure gauge. <br /> Equipment controls will be located in a control panel within the trailer and will include alarms <br /> that, in the event of an alarm condition, will trigger equipment shut down. PTA A and B will each <br /> be enclosed with temporary fencing, as will PTA C if pilot testing is initiated at this location. <br /> 4.2.2.2 Pilot Test Startup <br /> During pilot test startup,biosparging operational parameters including air flow rates and pressures <br /> will be evaluated and adjusted in the field to achieve optimal air distribution around the sparge <br /> In-Situ Bioremediation Pilot Test Work Plan—GSH Lathrop 10 <br />