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TABLE 4 Page 3 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-1-85 6/5/2007 310 t 2.0 1.6 2.8 20.1 <1.0 <10 0.40 v <2.0 <2.0 5.1 <1.0 <100 t <100 21.52 44.70 -23.18 - S-1-85 9/17/2007 420 t,u 3.3 2.5 1.9 15.4 - <1.0 <10 <2.0 <2.0 <2.0 4.0 <1.0 <100 t <100 21.52 47.49 -25.97 - S-1-85 12/13/2007 410 t 5.1 2.3 0.32 v 7.5 <1.0 <10 0.40 v <2.0 <2.0 4.6 <1.0 <100 t 360 21.52 47.79 -26.27 - S-1-85 3/20/2008 440 t 4.3 <1.0 <1.0 1.1 - <1.0 <10 <2.0 <2.0 <2.0 4.8 <1.0 <100 t <100 21.52 46.55 -25.03 - S-1-85 6/13/2008 2,900 33 7.5 19 136.8 <1.0 <10 <2.0 <2.0 <2.0 <0.50 <1.0 <100 t <100 21.52 46.75 -25.23 - S-1-85 9/11/2008 1,800 28 5.0 6.9 11.8 - <1.0 <10 <2.0 <2.0 <2.0 <0.50 <1.0 180 t <100 21.52 49.36 -27.84 - S-1-85 11/26/2008 1,200 27 2.7 1.3 3.0 <1.0 <10 <2.0 <2.0 <2.0 <0.50 <1.0 <100 t <100 21.52 50.50 -28.98 - S-1-85 3/11/2009 360 <0.50 <1.0 <1.0 1.6 - <1.0 <10 <2.0 <2.0 <2.0 11 <1.0 <100 t <100 21.52 50.31 -28.79 - S-1-85 5/19/2009 <50 <0.50 <1.0 <1.0 <1.0 <1.0 <10 <2.0 <2.0 <2.0 4.5 <1.0 <100 t <100 21.52 50.34 -28.82 - S-1-85 11/16/2009 <50 <0.50 <1.0 <1.0 <1.0 - <1.0 <10 <2.0 <2.0 <2.0 4.5 <1.0 <100 t <100 21.52 52.77 -31.25 - S-1-85 5/21/2010 68 <0.50 <1.0 <1.0 <1.0 <1.0 <10 <2.0 <2.0 <2.0 4.7 <1.0 <100 t <100 21.52 49.59 -28.07 - S-1-85 12/30/2010 <50 <0.50 <1.0 <1.0 <1.0 - <1.0 <10 <2.0 <2.0 <2.0 2.9 <1.0 <100 t <100 21.52 48.65 -27.13 - S-1-85 6/6/2011 180 <0.50 <0.50 <0.50 <1.0 <1.0 <10 <1.0 <1.0 <1.0 15.0 <0.50 <500 <150 21.52 45.83 -24.31 - S-1-85 12/8/2011 70 <0.50 <0.50 <0.50 3.79 - <0.50 <10 <0.50 - - <0.50 <0.50 <10,000w - 21.52 44.47 -22.95 - S-1-85 6/4/2012 75 <0.50 <0.50 <0.50 <1.0 - <0.50 <10 <0.50 - - 7.9 <0.50 - - 21.52 43.76 -22.24 - S-1-85 12/17/2012 55 <0.50 <0.50 <0.50 <1.0 - <0.50 <10 <0.50 - - 4.4 <0.50 <500 - 21.52 43.38 -21.86 - S-1-85 6/18/2013 58 <0.50 <0.50 <0.50 <1.0 - <0.50 <10 <0.50 - - 3.6 <0.50 <500 - 21.52 43.24 -21.72 - S-2 5/11/1998 <50 <0.50 <0.50 <0.50 <0.50 <2.5 <2.0 <100 <2.0 <2.0 <2.0 - - <1000 <500 21.14 49.74 -28.60 - S-2 8/13/1998 <50 <0.50 <0.50 <0.50 <0.50 <2.5 - - - - - - - - - 21.14 48.65 -27.51 - S-2 11/23/1998 <50 <0.50 0.76 <0.50 0.81 <2.5 - - - - - - - - - 21.14 48.42 -27.28 - S-2 2/23/1999 <50.0 <0.500 <0.500 <0.500 <0.500 <5.00 - - - - - - - - - 21.14 46.85 -25.71 - S-2 5/25/1999 <50.0 <0.500 <0.500 <0.500 <0.500 <5.00 - - - - - - - - - 21.14 44.28 -23.14 - S-2 8/5/1999 <50.0 <0.500 <0.500 <0.500 <0.500 <2.50 - - - - - - - - - 21.14 45.49 -24.35 - S-2 11/22/1999 <50 <0.50 <0.50 <0.50 <0.50 <2.5 - - - - - - - - - 21.14 47.76 -26.62 - S-2 2/1/2000 <50 <0.50 <0.50 <0.50 <0.50 <2.5 - - - - - - - - - 20.47 46.60 -26.13 - S-2 2/18/2000 - - - - - - - - - - - - - - - 20.47 46.46 -25.99 - S-2 5/3/2000 <50.0 <0.500 <0.500 <0.500 1.14 <2.50 - - - - - - - - - 20.47 44.30 -23.83 - S-2 8/2/2000 <50.0 <0.500 <0.500 <0.500 <0.500 <2.50 - - - - - - - - - 20.47 45.79 -25.32 - S-2 d 11/20/2000 <50 <0.50 <0.50 <0.50 <0.50 - <5.0 - - - - - - - - 20.47 47.74 -27.27 - S-2 2/5/2001 <50.0 <0.500 <0.500 <0.500 <0.500 <2.50 - - - - - - - 20.47 46.70 -26.23 - S-2 5/14/2001 <50 <0.50 <0.50 <0.50 <0.50 - <5.0 - - - - - - - - 20.47 46.46 -25.99 - S-2 8/30/2001 <50 <0.50 <0.50 <0.50 <0.50 - <5.0 - - - - - 20.47 50.29 -29.82 - S-2 11/28/2001 <50 <0.50 <0.50 <0.50 <0.50 - <5.0 - - - - - - - - 20.47 51.33 -30.86 - S-2 2/18/2002 <50 <0.50 <0.50 <0.50 <0.50 - <5.0 - - - - - 21.14 50.05 -28.91 - S-2 5/1/2002 <50 <0.50 <0.50 <0.50 <0.50 - <5.0 - - - - - - - - 21.14 49.54 -28.40 - S-2 8/8/2002 <50 <0.50 <0.50 <0.50 <0.50 - <5.0 - - - - - - 21.14 52.59 -31.45 - CRA240797(18)