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TABLE 4 Page 7 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-3 9/11/2008 <50 <0.50 <1.0 <1.0 <1.0 <1.0 <10 <2.0 <2.0 <2.0 0.73 <1.0 140 t <100 21.46 49.33 -27.87 - S-3 11/26/2008 <50 <0.50 <1.0 <1.0 1.9 - <1.0 <10 <2.0 <2.0 <2.0 1.7 <1.0 <100 t <100 21.46 49.99 -28.53 - S-3 3/11/2009 <50 <0.50 <1.0 <1.0 <1.0 <1.0 <10 <2.0 <2.0 <2.0 0.95 <1.0 <100 t <100 21.46 50.25 -28.79 - S-3 5/19/2009 <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 21.46 50.22 -28.76 - S-3 11/16/2009 <50 <0.50 <1.0 <1.0 <1.0 <1.0 <10 <2.0 <2.0 <2.0 1.2 <1.0 <100 t <100 21.46 52.66 -31.20 - S-3 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 21.46 49.52 -28.06 - S-3 12/30/2010 <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 21.46 48.90 -27.44 - S-3 6/6/2011 <50 <0.50 <0.50 <0.50 <1.0 - <1.0 <10 <1.0 <1.0 <1.0 2.6 <0.50 <500 <150 21.46 44.87 -23.41 - S-3 12/8/2011 <50 <0.50 <0.50 <0.50 0.57 <0.50 <10 <0.50 - - <0.50 <0.50 <10,000w - 21.46 44.65 -23.19 - S-3 6/4/2012 <50 <0.50 <0.50 <0.50 <1.0 - <0.50 <10 <0.50 - - <0.50 <0.50 - - 21.46 42.80 -21.34 - S-3 12/17/2012 <50 <0.50 <0.50 <0.50 <1.0 <0.50 <10 <0.50 - - <0.50 <0.50 <500 - 21.46 43.31 -21.85 - S-3 6/18/2013 <50 <0.50 <0.50 <0.50 <1.0 - <0.50 <10 <0.50 - - <0.50 <0.50 <500 - 21.46 43.20 -21.74 - S-3-84 12/31/2002 - - - - - - - - - - - - - - - 21.91 54.47 -32.56 - S-3-84 1/6/2003 100 <1.0 <1.0 1.0 3.7 <10 <50 2.1 <2.0 <2.0 45 <2.0 4300 <500 21.91 54.76 -32.85 - S-3-84 5/14/2003 78 <0.50 <0.50 <0.50 <0.50 - <0.50 <50 <2.0 <2.0 <2.0 47 <0.50 <1000 <500 21.91 52.27 -30.36 - S-3-84 8/14/2003 <50 <0.50 <0.50 <0.50 <1.0 - <0.50 <5.0 2.0 <2.0 <2.0 46 <0.50 <500 <50 21.91 54.61 -32.70 - S-3-84 12/30/2003 f <50 <0.50 <0.50 <0.50 <1.0 - <0.50 <5.0 <2.0 <2.0 <2.0 48 <0.50 <500 <50 21.91 55.36 -33.45 - S-3-84 2/5/2004 <50 <0.50 <0.50 <0.50 <1.0 - <0.50 <5.0 <2.0 <2.0 <2.0 44 <0.50 <500 <50 21.91 54.85 -32.94 - S-3-84 5/5/2004 <50 0.53 <0.50 <0.50 1.8 - <0.50 <5.0 <2.0 <2.0 <2.0 26 <0.50 <500 <50 21.91 53.60 -31.69 - S-3-84 7/26/2004 66 e <0.50 <0.50 <0.50 1.6 - <0.50 <5.0 <2.0 <2.0 <2.0 30 <0.50 <500 <50 21.91 55.18 -33.27 - S-3-84 11/10/2004 61 g <0.50 <0.50 <0.50 <1.0 - <0.50 <5.0 3.9 <2.0 <2.0 30 <0.50 <500 <50 21.91 57.42 -35.51 - S-3-84 2/21/2005 60 g <0.50 <0.50 <0.50 <1.0 - <0.50 <5.0 <2.0 <2.0 <2.0 28 <0.50 <500 <50 21.91 55.70 -33.79 - S-3-84 6/30/2005 <50 <0.50 <0.50 <0.50 <1.0 - <0.50 <5.0 <2.0 <2.0 <2.0 26 <0.50 <500 <50 21.91 52.79 -30.88 - S-3-84 08/18/2005 h <50 <0.50 <0.50 <0.50 <1.0 - <0.50 <5.0 <2.0 <2.0 <2.0 20 <0.50 <500 <50 21.91 53.98 -32.07 - S-3-84 12/29/2005 <50 <0.50 0.56 <0.50 <1.0 - <0.50 <5.0 <2.0 <2.0 <2.0 8.6 <0.50 <500 <50 21.91 53.85 -31.94 - S-3-84 3/6/2006 <50 <0.50 <1.0 <1.0 0.72 i - <1.0 <10 <2.0 <2.0 <2.0 10 <1.0 <100 <100 21.91 51.85 -29.94 - S-3-84 6/27/2006 <50 <0.50 <0.50 <0.50 2.6 - <0.50 <5.0 <2.0 <2.0 <2.0 7.7 <0.50 <100 n <50 21.91 47.82 -25.91 - S-3-84 9/26/2006 <50 <0.50 <0.50 <0.50 <1.0 - <0.50 <5.0 <2.0 <2.0 <2.0 8.6 <0.50 <100 <50 21.91 48.40 -26.49 - S-3-84 12/11/2006 <50 <0.50 1.7 <0.50 1.7 - <0.50 <5.0 <2.0 <2.0 <2.0 9.8 <0.50 <100 <50 21.91 47.75 -25.84 - S-3-84 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 <0.50 p <0.50 p <0.50 p 8.0 p <0.50 p <100 <100 p 21.91 46.42 -24.51 - S-3-84 6/5/2007 <50 t <0.50 <1.0 <1.0 <1.0 <1.0 <1.0 <10 <2.0 <2.0 <2.0 6.4 <1.0 <100 t <100 21.91 46.11 -24.20 - S-3-84 9/17/2007 <50 t 0.33 v 0.94 v 0.26 v 1.40 v - <1.0 <10 <2.0 <2.0 <2.0 6.0 <1.0 <100 t <100 21.91 47.89 -25.98 - S-3-84 12/13/2007 <50 t <0.50 <1.0 <1.0 <1.0 - <1.0 <10 <2.0 <2.0 <2.0 8.3 <1.0 <100 t <100 21.91 48.23 -26.32 - S-3-84 3/20/2008 <50 t <0.50 <1.0 <1.0 <1.0 - <1.0 <10 <2.0 <2.0 <2.0 8.5 <1.0 <100 t <100 21.91 47.13 -25.22 - S-3-84 6/13/2008 <50 <0.50 <1.0 <1.0 <1.0 - <1.0 <10 <2.0 <2.0 <2.0 5.8 <1.0 <100 t <100 21.91 47.42 -25.51 - S-3-84 9/11/2008 <50 <0.50 <1.0 <1.0 <1.0 - <1.0 <10 <2.0 <2.0 <2.0 8.3 <1.0 170 t <100 21.91 49.80 -27.89 - CRA240797(18)