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' Fourth Quarter/Annual <br /> 2008 Groundwater <br /> ' ARCADIS Monitoring Report <br /> Chevron Bulk Fuel Terminal <br /> 100-1621 <br /> 22888 Kasson Road <br /> Banta, California <br /> Bio-sparge technology has been proposed as a remedial action to reduce groundwater <br /> concentrations in the excavated area.An Implementation Report specifying <br /> construction and operation will be submitted to the RWCQB under separate. <br /> ' TPH•DRO Concentrations in pg/L <br /> Quarter MW34UA MW35UA <br /> ' Third Quarter 2004 490 97 <br /> Fourth Quarter 2004 500 86 <br /> First Quarter 2005 370 310 <br /> ' Second Quarter 2005 1,100 410 <br /> Third Quarter 2005 660 170 <br /> Fourth Quarter 2005 100 <50 <br /> ' First Quarter 2006 980 <50 <br /> Second Quarter 2006 1,300 230 <br /> Third Quarter 2006 460 120 <br /> ' Fourth Quarter 2006 580 52 <br /> First Quarter 2007 1,200 690 <br /> Second Quarter 2007 900 62 <br /> ' Third Quarter 2007 2,100 120 <br /> Fourth Quarter 2007 NS NS <br /> First Quarter 2008 1,700 210 <br /> ' Second Quarter 2008 NS NS <br /> Third Quarter 2008 580 61 <br /> Fourth Quarter 2008 NS NS <br /> ' Notes: <br /> 1. pg/L=microgram per liter,equivalent to part per billion(ppb) <br /> 2. NS=not sampled <br /> Evaluation of Groundwater Oxygenation System <br /> ' Operation of the groundwater oxygenation system was initiated on April 19, 2004.The <br /> groundwater oxygenation system consists of 65 oxygenation points(OW-1 through <br /> OW-65), arranged in four banks of 16 to 17 wells, connected by mechanical piping to a <br /> ' 5 horsepower(hp)rotary vane compressor capable of 41 standard cubic feet per <br /> minute(scfm)at 21 pounds per square inch (psi). Each groundwater oxygenation point <br /> is equipped with a flow gauge,gate valve and pressure gauge to control airflow and <br /> ' pressure. Locations of oxygenation points are shown on Figure 2. <br /> ' 11 of 17 <br />