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TABLE 4 Page 9 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-4 6/27/2006 <50 <0.50 <0.50 <0.50 <1.0 <0.50 <5.0 4.3 <2.0 <2.0 7.2 <0.50 <100 j <50 22.29 48.43 -26.14 - S-4 9/26/2006 52 0.64 2.4 1.2 5.8 - <0.50 <5.0 4.4 <2.0 <2.0 6.6 <0.50 <100 <50 22.29 48.70 -26.41 - S-4 12/11/2006 <50 <0.50 <0.50 <0.50 <1.0 <0.50 <5.0 4.8 <2.0 <2.0 8.8 <0.50 <100 <50 22.29 48.04 -25.75 - S-4 3/15/2007 <50 p <0.50 p <0.50 p <0.50 p <0.50 p <0.50 p <0.50 p <20 p 4.1 p <0.50 p <0.50 p 8.2 p <0.50 p <100 <100 p 22.29 46.60 -24.31 - S-4 6/5/2007 <50 t <0.50 <1.0 <1.0 <1.0 <1.0 <1.0 <10 3.8 <2.0 <2.0 7.5 <1.0 <100 t <100 22.29 46.35 -24.06 - S-4 9/17/2007 <50 t <0.50 <1.0 <1.0 <1.0 <1.0 <1.0 <10 3.9 <2.0 <2.0 9.6 <1.0 <100 t <100 22.29 48.28 -25.99 - S-4 12/13/2007 <50 t <0.50 <1.0 <1.0 <1.0 <1.0 <1.0 <10 5.1 <2.0 <2.0 11 <1.0 <100 t <100 22.29 48.59 -26.30 - S-4 3/20/2008 <50 t <0.50 <1.0 <1.0 <1.0 <1.0 <1.0 <10 3.5 <2.0 <2.0 8.9 <1.0 <100 t <100 22.29 47.40 -25.11 - S-4 6/13/2008 <50 <0.50 <1.0 <1.0 <1.0 - <1.0 <10 3.4 <2.0 <2.0 8.0 <1.0 <100 t <100 22.29 47.72 -25.43 - S-4 9/11/2008 <50 <0.50 <1.0 <1.0 <1.0 - <1.0 <10 2.2 <2.0 <2.0 5.3 <1.0 130 t <100 22.29 50.15 -27.86 - S-4 11/26/2008 <50 <0.50 <1.0 <1.0 <1.0 - <1.0 <10 2.5 <2.0 <2.0 7.1 <1.0 <100 t <100 22.29 50.84 -28.55 - S-4 3/11/2009 59 <0.50 <1.0 <1.0 <1.0 - <1.0 <10 2.1 <2.0 <2.0 5.2 <1.0 <100 t <100 22.29 51.05 -28.76 - S-4 5/19/2009 <50 <0.50 <1.0 <1.0 <1.0 - <1.0 <10 2.1 <2.0 <2.0 3.8 <1.0 <100 t <100 22.29 51.11 -28.82 - S-4 11/16/2009 <50 <0.50 <1.0 <1.0 <1.0 - <1.0 <10 <2.0 <2.0 <2.0 3.8 <1.0 <100 t <100 22.29 53.63 -31.34 - S-4 5/21/2010 <50 <0.50 <1.0 <1.0 <1.0 - <1.0 <10 <2.0 <2.0 <2.0 3.8 <1.0 <100 t <100 22.29 50.40 -28.11 - S-4 12/30/2010 <50 <0.50 <1.0 <1.0 <1.0 - <1.0 <10 <2.0 <2.0 <2.0 4.4 <1.0 <100 t <100 22.29 49.34 -27.05 - S-4 6/6/2011 <50 <0.50 <0.50 <0.50 <1.0 - <1.0 <10 2.2 <1.0 <1.0 4.7 <0.50 <500 <150 22.29 46.60 -24.31 - S-4 12/8/2011 <50 <0.50 <0.50 <0.50 <0.50 - <0.50 <10 1.05 - - <0.50 <0.50 <10,000w - 22.29 45.31 -23.02 - S-4 6/4/2012 <50 <0.50 <0.50 <0.50 <0.50 - <0.50 <10 1.5 - - 3.5 <0.50 - - 22.29 43.56 -21.27 - S-4 12/17/2012 <50 <0.50 <0.50 <0.50 <1.0 - <0.50 <10 <0.50 - - <0.50 <0.50 <500 - 22.29 44.12 -21.83 - S-4 6/18/2013 <50 <0.50 <0.50 <0.50 <1.0 - 0.68 <10 0.71 - - 2.7 <0.50 <500 - 22.29 44.01 -21.72 S4-83 12/31/2002 - - - - - - - - - - - - - - 22.43 54.92 -32.49 - S-4-83 1/6/2003 240 <0.50 <0.50 1.8 3.1 - <5.0 <50 7.2 <2.0 <2.0 74 <2.0 <1000 <500 22.43 54.26 -31.83 - S-4-83 5/14/2003 430 0.54 <0.50 0.53 <0.50 0.64 <50 7.4 <2.0 <2.0 100 <0.50 <1000 <500 22.43 52.78 -30.35 - S-4-83 8/14/2003 360 e <0.50 <0.50 <0.50 <1.0 - 0.60 <5.0 16 <2.0 <2.0 130 <0.50 <500 <50 22.43 54.91 -32.48 - S-4-83 12/30/2003 f 83 e <0.50 <0.50 <0.50 <1.0 - 2.0 <5.0 15 <2.0 <2.0 120 <0.50 <500 <50 22.43 55.88 -33.45 - S-4-83 2/5/2004 150 <0.50 <0.50 0.90 2.6 - 2.2 <5.0 18 <2.0 <2.0 130 <0.50 <500 <50 22.43 55.36 -32.93 - S-4-83 5/5/2004 86 0.82 0.72 0.71 3.0 2.2 <5.0 7.9 <2.0 <2.0 75 <0.50 <1000 <50 22.43 54.18 -31.75 - S-4-83 7/26/2004 87 e <0.50 <0.50 <0.50 <1.0 - <0.50 <5.0 7.7 <2.0 <2.0 99 <0.50 <500 <50 22.43 55.70 -33.27 - S-4-83 11/10/2004 110 g <0.50 <0.50 <0.50 <1.0 - <0.50 <5.0 6.9 <2.0 <2.0 95 <0.50 <500 <50 22.43 57.94 -35.51 - S-4-83 2/21/2005 75 <0.50 <0.50 <0.50 <1.0 - <0.50 <5.0 6.5 <2.0 <2.0 83 <0.50 <500 <50 22.43 56.20 -33.77 - S-4-83 6/30/2005 77 g <0.50 <0.50 <0.50 <1.0 - <0.50 <5.0 4.8 <2.0 <2.0 68 <0.50 <500 <50 22.43 53.25 -30.82 - S-4-83 08/18/2005 h <50 <0.50 <0.50 <0.50 <1.0 - <0.50 <5.0 2.7 <2.0 <2.0 49 <0.50 <500 <50 22.43 54.48 -32.05 - S-4-83 12/29/2005 h <50 <0.50 0.54 <0.50 <1.0 - <0.50 <5.0 3.8 <2.0 <2.0 44 <0.50 <500 <50 22.43 54.22 -31.79 - S-4-83 3/6/2006 <50 <0.50 <1.0 <1.0 <1.0 - <1.0 <10 1.8 i <2.0 <2.0 31 <1.0 <100 <100 22.43 50.08 -27.65 - S-4-83 6/27/2006 <50 <0.50 <0.50 <0.50 <1.0 - <0.50 <5.0 <2.0 <2.0 <2.0 24 <0.50 <100 j <50 22.43 48.28 -25.85 - CRA240797(18)