ARCHIVED REPORTS_GROUNDWATER MONITORING AND REMEDIATION REPORT - 3RD AND 4TH QUARTERS 2010

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TABLE 4 Page 2 of 2 GROUNDWATER FLOW DIRECTION AND GRADIENT SHELL STOCKTON TERMINAL 3515 NAVY DRIVE,STOCKTON,CALIFORNIA Near Truck Loading Rack Near Well MW-10 Date Gauged Direction Degrees Gradient Direction Degrees Gradient Notes 08/06/2001 SW 230 0.006 SSE 170 0.006 11/20/2001 SW 220 0.003 SSE 165 0.006 02/21/2002 SSW 210 0.007 SSE 180 0.006 05/22/2002 SSW 235 0.005 SSE 150 0.004 08/19/2002 SSW 235 0.005 SSE 165 0.004 11/20/2002 SW 245 0.003 S 196 0.005 02/20/2003 SW 231 0.004 SW 206 0.004 05/30/2003 SW 224 0:006 SE 280 0.005 08/13/2003 S 227 0.008 SE 277 0.01 11/06/2003 SW 224 0.005 SSE 170 0.01 Migration control 02/10/2004 SW 225 0.003 SSW 197 0.003 System off 05/20/2004 SW 227 0.004 SSE 158 0.02 System off 08/16/2004 SW 214 0.014 SSW 194 0.009 System off 11/29/2004 SW 214 0.003 SSW 194 0.004 System off 02/17/2005 Variable Variable Variable Variable Variable Variable Migration control 05/12/2005 SSW 235 0.005 SSE 164 0.005 System off 08/31/2005 SW 233 0.004 Variable Variable 0.033 Migration control 11/30/2005 SW 232 0.005 SSE Variable 0.033 System off 02/02/2006 SW Variable 0.004 SSE Variable 0.010 Well MW-10 off 05/30/2006 SW Variable 0.030 SSW Variable 0.010 Well MW-10 off 08/31/2006 SW Variable 0.006 Variable Variable 0.032 Well MW-10 off 11/16/2006 Variable Variable 0.020 Variable Variable 0.033 Well MW-10 off 02/26/2007 SW Variable 0.004 SSE Variable 0.01 Well MW-10 off 05/29/2007 SW Variable 0.003 SSE Variable 0.01 Well MW-10 off 08/27/2007 SW Variable 0.007 Variable Variable 0.10 Well MW-10 off 11/29/2007 Variable Variable 0.090 SSE Variable 0.01 Well MW-10 off 02/22/2008 SW Variable 0.002 Variable Variable 0.02 Well MW-10 off 05/21/2008 SW Variable 0.001 Variable Variable 0.03 Well MW-10 off 08/28/2008 SW Variable 0.010 SSE Variable 0.004 Well MW-10 off 11/06/2008 SW Variable 0.003 SSE Variable 0.004 Well MW-10 off 02/10/2009 Variable Variable Variable SSE Variable Variable Well MW-10 off 05/07/2009 Variable Variable Variable SSE Variable Variable Well MW-10 off 08/31/2009 SW Variable 0.04 SW Variable 0.002 Well MW-10 off 11/12/2009 Variable Variable 0.04 Variable Variable 0.003 Well MW-10 off 02/03/2010 Variable Variable Variable Variable Variable Variable Well MW-10 off 05/06/2010 Variable Variable Variable SW Variable Variable Well MW-10 off 08/30/2010 Variable Variable Variable Variable Variable Variable Well MW-10 off 12/03/2010 Variable Variable Variable Variable Variable Variable Well MW-10 off Notes: Due to spatially variable groundwater flow,two locations were chosen based on hydrocarbon concentrations and potentially being near a source area. *=Migration control often masks groundwater flow direction and gradient. CRA 241729(28)