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TABLE 1 Page 2 of 12 GROUNDWATER DATA SHELL-BRANDED SERVICE STATION 4315 WATERLOO ROAD STOCKTON,CALIFORNIA MTBE MTBE 1,2- Depth to GW Well ID Date TPPH B T E X 8020 8260 TBA DIPE ETBE TAME DCA EDB Ethanol TOC Water Elevation µSlL µ8lL ELB/L µglL µg/E µ8lL µSlL gglL µglL µSlL µ$ms µg/L µ$ms µ8lL ft MSL ft TOC ft MSL MW-1 9/25/2006 170 <0.50 <0.50 <0.50 <1.0 - 3.7 4,000 i <2.0 <2.0 <2.0 - - <50 31.52 59.84 -28.32 MW-1 12/11/2006 120 <0.50 <0.50 <0.50 <1.0 - 17 2,400 - - - - - - 31.52 58.24 -26.72 MW-1 3/14/2007 240 <0.50 <0.50 <0.50 <1.0 - 11 5,400 - - - - - - 31.52 58.64 -27.12 MW-1 6/19/2007 190 j <2.5 <5.0 <5.0 <5.0 - 12 4,200 - - - - - - 31.52 60.60 -29.08 MW-1 9/20/2007 <50 j <2.5 <5.0 <5.0 <5.0 - 11 2,200 <10 <10 <10 - - <500 31.52 65.19 -33.67 MW-1 12/27/2007 <50 j <0.50 <1.0 <1.0 <1.0 - 21 960 - - - - - - 31.52 65.05 -33.53 MW-1 3/13/2008 270 <0.50 <1.0 <1.0 <1.0 - 5.2 3,200 - - - - - - 31.52 62.94 -31.42 MW-1 6/4/2008 210 <0.50 <1.0 <1.0 <1.0 - 14 4,200 - - - - - - 31.52 64.42 -32.90 MW-1 9/18/2008 140 <0.50 <1.0 <1.0 <1.0 - 79 <10 <2.0 <2.0 <2.0 <0.50 <1.0 <100 31.52 70.46 -38.94 MW-1 12/16/2008 120 <0.50 <1.0 <1.0 <1.0 - 80 15 <2.0 <2.0 <2.0 <0.50 <1.0 - 31.52 70.52 -39.00 MW-1 3/16/2009 250 <0.50 <1.0 <1.0 <1.0 - 270 18 <2.0 <2.0 <2.0 <0.50 <1.0 - 31.52 69.23 -37.71 MW-1 6/3/2009 290 <1.0 <2.0 <2.0 <2.0 - 210 <20 <4.0 <4.0 <4.0 <1.0 <2.0 - 31.52 71.01 -39.49 MW-1 11/13/2009 Well dry - - - - - - - - - - - - - 31.52 - - MW-1 6/21/2010 530 <1.0 <2.0 <2.0 <2.0 - 360 4,900 <4.0 <4.0 <4.0 <1.0 <2.0 <200 31.52 66.10 -34.58 MW-1 12/22/2010 780 <5.0 <10 <10 <10 - 970 310 - - - <5.0 - - 31.52 67.22 -35.70 MW-1 5/25/2011 <1,000 <10 <10 <10 <20 - 58 15,000 <20 <20 <20 <10 <10 <3000 31.52 62.20 -30.68 MW-1 11/4/2011 <1,000 <10 <10 <10 <20 - 51 17,000 - - - <10 - - 31.52 62.41 -30.89 MW-1 3/1/2012 - - - - - - - - - - - - - - 31.52 60.32 -28.80 , r MW-2 11/14/2001 - - - - - - - - - - - - - - 31.23 65.03 -33.80 MW-2 11/16/2001 <50 <0.50 <0.50 <0.50 <0.50 - <0.50 <50 <2.0 <2.0 <2.0 <2.0 <2.0 <500 31.23 64.83 -33.60 MW-2 1/23/2002 <50 <0.50 <0.50 <0.50 <0.50 - 3.4 <50 <2.0 <2.0 <2.0 <2.0 <2.0 - 31.23 62.04 -30.81 MW-2 4/18/2002 <50 <0.50 <0.50 <0.50 <0.50 - <0.50 <50 <2.0 <2.0 <2.0 <2.0 <2.0 - 31.23 61.04 -29.81 MW-2 7/31/2002 <50 <0.50 <0.50 <0.50 0.68 - 1.0 <50 <2.0 <2.0 <2.0 <2.0 <2.0 - 31.23 67.26 -36.03 MW-2 10/11/2002 58 <0.50 <0.50 <0.50 <0.50 - <5.0 - - - - - - - 31.23 69.65 -38.42 MW-2 1/3/2003 <50 <0.50 <0.50 <0.50 <0.50 - <5.0 - - - - - - - 31.23 66.90 -35.67 MW-2 4/10/2003 <50 <0.50 0.64 <0.50 <0.50 - <5.0 - - - - - - - 31.23 64.64 -33.41 MW-2 7/11/2003 <50 <0.50 <0.50 <0.50 <1.0 - <0.50 <5.0 - - - - - - 31.23 67.92 -36.69 CRA241359(14)