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TABLE 4 Page 4 of 13 GROUNDWATER DATA SHELL-BRANDED SERVICE STATION 2494 EAST FREMONT STREET STOCKTON,CALIFORNIA MTBE MTBE 1,2- Depth to GW SPH Well ID Date TPHg B T E X 8020 8260 TBA DIPS ETBE TAME DCA EDB Methanol Ethanol TOC Water Elevation Thickness (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (PRE) (PNE) (,ug/L) (PNE) (PRE) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (ft MSL) (ft TOC) (ft MSL) (feet) S-2 10/28/2002 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <50 <2.0 <2.0 <2.0 2.8 <2.0 <1000 <500 21.14 54.61 -33.47 - S-2 1/6/2003 <50 <0.50 <0.50 0.71 2.0 - <5.0 - - - - - - - - 21.14 53.46 -32.32 - S-2 5/14/2003 <50 <0.50 <0.50 <0.50 <0.50 <5.0 - - - - 2.2 - - - 21.14 51.42 -30.28 - S-2 8/14/2003 <50 <0.50 <0.50 <0.50 <1.0 - <0.50 <5.0 <2.0 <2.0 <2.0 3.4 <0.50 <500 <50 21.14 53.82 -32.68 - S-2 12/30/2003 <50 <0.50 <0.50 <0.50 <1.0 <0.50 <5.0 <2.0 <2.0 <2.0 1.1 <0.50 <500 <50 21.14 54.85 -33.71 - S-2 2/5/2004 <50 <0.50 <0.50 0.54 1.8 - <0.50 <5.0 <2.0 <2.0 <2.0 2.6 <0.50 <500 <50 21.14 54.10 -32.96 - S-2 5/5/2004 <50 <0.50 <0.50 <0.50 <1.0 <0.50 <5.0 <2.0 <2.0 <2.0 1.9 <0.50 <500 <50 21.14 52.87 -31.73 - S-2 7/26/2004 <50 <0.50 <0.50 <0.50 <1.0 - <0.50 <5.0 <2.0 <2.0 <2.0 2.5 <0.50 <500 <50 21.14 54.13 -32.99 - S-2 11/10/2004 <50 <0.50 <0.50 <0.50 <1.0 <0.50 <5.0 <2.0 <2.0 <2.0 3.2 <0.50 <500 <50 21.14 56.68 -35.54 - S-2 2/21/2005 <50 <0.50 <0.50 <0.50 <1.0 - <0.50 <5.0 <2.0 <2.0 <2.0 2.0 <0.50 <500 <50 21.14 54.86 -33.72 - S-2 6/30/2005 <50 <0.50 <0.50 <0.50 <1.0 <0.50 <5.0 <2.0 <2.0 <2.0 2.0 <0.50 <500 <50 21.14 52.07 -30.93 - S-2 8/18/2005 <50 <0.50 <0.50 <0.50 <1.0 - <0.50 <5.0 <2.0 c <2.0 c <2.0 1.6 <0.50 <500 <50 c 21.14 53.29 -32.15 - S-2 12/29/2005 70 <0.50 0.64 <0.50 <1.0 <0.50 <5.0 <2.0 <2.0 <2.0 3.2 <0.50 <500 <50 21.14 53.00 -31.86 - S-2 3/6/2006 <50 <0.50 <1.0 <1.0 <1.0 - <1.0 <10 <2.0 <2.0 <2.0 3.9 <1.0 <100 <100 21.14 50.70 -29.56 - S-2 6/27/2006 <50 <0.50 <0.50 <0.50 <1.0 - <0.50 <5.0 <2.0 <2.0 <2.0 1.3 <0.50 <100 n <50 21.14 47.07 -25.93 - S-2 9/26/2006 120 <0.50 <0.50 <0.50 <1.0 - <0.50 <5.0 <2.0 <2.0 <2.0 1.5 <0.50 <100 <50 21.14 47.57 -26.43 - S-2 12/11/2006 <50 <0.50 <0.50 <0.50 <1.0 - <0.50 <5.0 <2.0 <2.0 <2.0 1.4 <0.50 <100 <50 21.14 46.89 -25.75 - S-2 3/15/2007 <50 <0.50 s <0.50 s <0.50 s <0.50 s <0.50 s 1.2s <20 s <0.50 s <0.50 s <0.50 s 2.7s <0.50 s <100 <100 s 21.14 45.15 -24.01 - S-2 6/5/2007 <50 t <0.50 <1.0 <1.0 <1.0 <1.0 <1.0 <10 <2.0 <2.0 <2.0 1.8 <1.0 <100 t <100 21.14 45.35 -24.21 - S-2 9/17/2007 <50 t 0.24 v 0.69 v 0.41 v 3.63 v - <1.0 <10 <2.0 <2.0 <2.0 <0.50 <1.0 <100 t <100 21.14 47.01 -25.87 - S-2 12/13/2007 <50 t <0.50 <1.0 <1.0 <1.0 - <1.0 <10 <2.0 <2.0 <2.0 <0.50 <1.0 <100 t <100 21.14 47.48 -26.34 - S-2 3/20/2008 <50 t <0.50 <1.0 <1.0 <1.0 - <1.0 <10 <2.0 <2.0 <2.0 2.5 <1.0 <100 t <100 21.14 46.30 -25.16 - S-2 6/13/2008 <50 <0.50 <1.0 <1.0 <1.0 - <1.0 <10 <2.0 <2.0 <2.0 <0.50 <1.0 <100 t <100 21.14 46.63 -25.49 - S-2 9/11/2008 <50 <0.50 <1.0 <1.0 1.0 - <1.0 <10 <2.0 <2.0 <2.0 0.55 <1.0 <100 t <100 21.14 49.00 -27.86 - S-2 11/26/2008 <50 <0.50 <1.0 <1.0 <1.0 - <1.0 <10 <2.0 <2.0 <2.0 1.6 <1.0 <100 t <100 21.14 49.65 -28.51 - S-2 3/11/2009 <50 <0.50 <1.0 <1.0 <1.0 - <1.0 <10 <2.0 <2.0 <2.0 1.1 <1.0 <100 t <100 21.14 49.87 -28.73 - S-2 5/19/2009 <50 <0.50 <1.0 <1.0 <1.0 - <1.0 <10 <2.0 <2.0 <2.0 0.67 <1.0 <100 t <100 21.14 49.88 -28.74 - S-2 11/16/2009 <50 <0.50 <1.0 <1.0 <1.0 - <1.0 <10 <2.0 <2.0 <2.0 0.87 <1.0 <100 t <100 21.14 52.40 -31.26 - S-2 5/21/2010 <50 <0.50 <1.0 <1.0 <1.0 - <1.0 <10 <2.0 <2.0 <2.0 <0.50 <1.0 <100 t <100 21.14 49.21 -28.07 - S-2 12/30/2010 Well inaccessible - - - - - - - - - - - - 21.14 - - - S-2 6/6/2011 <50 <0.50 <0.50 <0.50 <0.50 <1.0 <10 <1.0 <1.0 <1.0 0.96 <0.50 <500 <150 21.14 45.40 -24.26 - S-2 12/8/2011 66 <0.50 <0.50 <0.50 <0.50 <0.50 <10 <0.50 - - <0.50 <0.50 <10,000w - 21.14 44.14 -23.00 - S-2 6/4/2012 Well inaccessible - - - - - - - - - - - - 21.14 - - - S-2 12/17/2012 <50 <0.50 <0.50 <0.50 <1.0 - <0.50 <10 <0.50 - - <0.50 <0.50 <500 - 21.14 43.00 -21.86 - S-2 6/18/2013 <50 <0.50 <0.50 <0.50 <1.0 - <0.50 <10 <0.50 - - <0.50 <0.50 <500 - 21.14 42.85 -21.71 - S-2-85 12/22/2003 - - - - - - - - - - - 20.13 53.55 -33.42 - CRA240797(18)