ARCHIVED REPORTS_GROUNDWATER MONITORING AND REMEDIATION REPORT - 3RD AND 4TH QUARTERS 2011

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TABLE 6 Page 1 of 1 VERTICAL GROUNDWATER GRADIENT DATA SHELL STOCKTON TERMINAL 3515 NAVY DRIVE,STOCKTON,CALIFORNIA Screen Screen Calculated Deeper Midpoint GW Shallow Ganging Midpoint GW Vertical $i g Well TOC Elevation Elevation Well TOC Elevation Elevation Gradient Date ID (ft MSL) (ft MSL) (ft MSL) ID (ft MSL) (ft MSL) (ft MSL) (fee Vfoot) 2/17/2005 DW-2 3.22 -54.08 -1.62 MW-26 3.61 -13.44 -0.49 -0.028 5/12/2005 DW-2 3.22 -54.08 -2.58 MW-26 3.61 -13.44 -2.33 -0,006 8/30/2005 DW-2 3.22 -54.08 -3.83 MW-26 3.61 -13.44 11/30/2005 DW-2 3.21 -54.09 -3.84 0.000 -4.20 MW-26 3.58 -13.47 4.26 0.001 2/2/2006 DW-2 3.21 -54.09 -1.89 MW-26 3.58 -13.47 5/30/2006 DW-2 3.21 -54.09 -1.56 -0.008 -2.18 MW-26 3.58 -13.47 -1.88 -0.007 8/31/2006 DW-2 3.21 -54.09 -3.70 MW-26 3.58 -13.47 -3.56 -0.003 11/16/2006 DW-2 3.21 -54.09 -4.70 MW-26 3.58 -13.47 -3.60 -0.027 2/26/2007 DW-2 3.21 -54.09 -2.99 MW-26 3.58 -13.47 -2.83 -0.004 5/29/2007 DW-2 3.21 -54.09 -3.60 MW-26 3.58 -13.47 -3.47 -0.003 8/27/2007 DW-2 3.21 -54.09 -3.94 MW-26 3.58 -13.47 -3.57 -0.009 11/29/2007 DW-2 3.21 --54.09 -3.83 MW-26 3.58 -13.47 -3.89 0.001 2/22/2008 DW-2 3.21 -54.09 -2.24 MW-26 3.58 -13.47 -1.82 -0.010 5/21/2008 DW-2 3.21 -54.09 -3.94 MW-26 3.58 -13.47 -3.72 -0.005 8/28/2008 DW-2 3.21 -54.09 -3.95 MW-26 3.58 -13.47 -3.88 -0.002 11/6/2008 DW-2 3.21 -54.09 -3.54 MW-26 3.58 -13.47 -3.42 -0.003 2/10/2009 DW-2 3.21 -54.09 NA MW-26 3.58 -13.47 NA NA 5/7/2009 DW-2 3.21 -54.09 -3.09 MW-26 3.58 -13.47 -2.87 -0.005 8/31/2009 DW-2 3.21 -54.09 -3.64 MW-26 3.58 -13.47 -3.77 0.003 11/12/2009 DW-2 3.21 -54.09 -5.38 MW-26 3.58 -13.47 -3.56 -0.045 2/3/2010 DW-2 3.21 -54.09 -3.49 MW-26 3.58 -13.47 -2.22 -0.031 5/6/2010 DW-2 3.21 -54.09 -7.39 MW-26 3.58 -13.47 -2.12 -0.130 8/30/2010 DW-2 3.21 -54.09 4.39 MW-26 3.58 -13.47 -3.77 -0.015 12/3/2010 DW-2 3.21 -54.09 -3.54 MW-26 3.58 -13.47 -3.23 -0.008 2/18/2011 DW-2 3.21 -54.09 -1.99 MW-26 3.58 -13.47 -2.02 0.001 5/19/2011 DW-2 3.21 -54.09 -2.19 MW-26 3.58 -13.47 -2.07 -0.003 9/7/2011 DW-2 6.15 -51.15 -0.39 MW-26 6.51 -10.54 -0.54 0.004 12/6/2011 DW-2 6.15 -51.15 -0.36 MW-26 6.51 -10.54 -0.74 0.009 Notes: TOC=Top of casing elevation,in feet referenced to mean sea level GW=Groundwater ft=Feet MSL=Mean sea level Calculated vertical gradient consists of the difference between groundwater elevations divided by the difference between screen mid-point elevations. *Negative sign denotes downward vertical gradient NA=Not available CRA 241139(33)