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TABLE 4 Page 6 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) (,ug/L) (PNE) (,ug/L) (PNE) (PRE) (P91L) (pg/L) (pg/L) (pg/L) (pg/L) (ft MSL) (ft TOC) (ft MSL) (feet) S-3 8/5/1999 <50.0 <0.500 <0.500 <0.500 <0.500 <2.50 - - - - 21.48 45.56 -24.08 - S-3 11/22/1999 <50 <0.50 <0.50 <0.50 <0.50 <2.5 - - - - - - - - - 21.48 47.99 -26.51 - S-3 2/1/2000 <50 <0.50 <0.50 <0.50 <0.50 <2.5 - - - - - 20.80 47.51 -26.71 - S-3 2/18/2000 - - - - - - - - - - - - - - - 20.80 46.82 -26.02 - S-3 5/3/2000 61.0 <0.500 1.23 <0.500 5.33 <2.50 - - - - - 20.80 44.55 -23.75 - S-3 8/2/2000 <50.0 <0.500 <0.500 <0.500 <0.500 <2.50 - - - - - - - - - 20.80 45.98 -25.18 - S-3 d 11/20/2000 <50 <0.50 <0.50 <0.50 <0.50 - <5.0 - - - - 20.80 47.66 -26.86 - S-3 2/5/2001 <50.0 <0.500 <0.500 <0.500 <0.500 <2.50 - - - - - - - - - 20.80 46.90 -26.10 - S-3 5/14/2001 <50 <0.50 <0.50 <0.50 <0.50 - <5.0 - - - - 20.80 46.53 -25.73 - S-3 8/30/2001 <50 <0.50 <0.50 <0.50 <0.50 - <5.0 - - - - - - - - 20.80 50.51 -29.71 - S-3 11/28/2001 <50 <0.50 <0.50 <0.50 <0.50 - <5.0 - - - 20.80 51.60 -30.80 - S-3 2/18/2002 <50 <0.50 <0.50 <0.50 <0.50 - <5.0 - - - - - - - - 21.46 50.30 -28.84 - S-3 5/1/2002 <50 <0.50 <0.50 <0.50 <0.50 - <5.0 - - - 21.46 49.84 -28.38 - S-3 8/8/2002 <50 <0.50 <0.50 <0.50 <0.50 - <5.0 - - - - - - - - 21.46 51.77 -30.31 - S-3 10/28/2002 95 <0.50 <0.50 <0.50 <0.50 - <0.50 <50 2.4 <2.0 <2.0 39 <2.0 <1000 <500 21.46 54.86 -33.40 - S-3 1/6/2003 76 <0.50 <0.50 <0.50 <0.50 - <5.0 - - - - - - - - 21.46 53.77 -32.31 - S-3 5/14/2003 51 <0.50 <0.50 <0.50 <0.50 - <5.0 - - - - 22 - - - 21.46 51.80 -30.34 - S-3 8/14/2003 <50 <0.50 <0.50 <0.50 <1.0 - <0.50 <5.0 <2.0 <2.0 <2.0 38 <0.50 <500 <50 21.46 54.04 -32.58 - S-3 12/30/2003 <50 <0.50 <0.50 <0.50 <1.0 - <0.50 <5.0 <2.0 <2.0 <2.0 48 <0.50 <500 <50 21.46 54.87 -33.41 - S-3 2/5/2004 <50 <0.50 <0.50 <0.50 <1.0 - <0.50 <5.0 2.2 <2.0 <2.0 46 <0.50 <500 <50 21.46 54.37 -32.91 - S-3 5/5/2004 <50 <0.50 <0.50 <0.50 <1.0 - <0.50 <5.0 <2.0 <2.0 <2.0 26 <0.50 <500 <50 21.46 53.08 -31.62 - S-3 7/26/2004 <50 <0.50 <0.50 <0.50 <1.0 - <0.50 <5.0 <2.0 <2.0 <2.0 37 <0.50 <500 <50 21.46 54.70 -33.24 - S-3 11/10/2004 59 g <0.50 <0.50 <0.50 <1.0 - <0.50 <5.0 4.7 <2.0 <2.0 55 <0.50 <500 <50 21.46 56.96 -35.50 - S-3 2/21/2005 68 g <0.50 <0.50 <0.50 <1.0 - <0.50 <5.0 3.5 <2.0 <2.0 78 <0.50 <500 <50 21.46 55.26 -33.80 - S-3 6/30/2005 <50 <0.50 <0.50 <0.50 <1.0 - <0.50 <5.0 <2.0 <2.0 <2.0 3.9 <0.50 <500 <50 21.46 52.25 -30.79 - S-3 8/18/2005 Well inaccessible - - - - - - - - - - - - - 21.46 - - - S-3 12/29/2005 Well inaccessible - - - - - - - - - - - - - 21.46 - - - S-3 3/6/2006 <50 <0.50 <1.0 <1.0 <1.0 - <1.0 <10 <2.0 <2.0 <2.0 1.7 <1.0 <100 <100 21.46 51.04 -29.58 - S-3 6/27/2006 <50 <0.50 <0.50 <0.50 <1.0 - <0.50 <5.0 <2.0 <2.0 <2.0 0.90 <0.50 <100 n <50 21.46 47.15 -25.69 - S-3 9/26/2006 <50 <0.50 <0.50 <0.50 <1.0 - <0.50 <5.0 <2.0 <2.0 <2.0 0.62 <0.50 <100 <50 21.46 47.91 -26.45 - S-3 12/11/2006 64 <0.50 <0.50 <0.50 <1.0 - <0.50 <5.0 <2.0 <2.0 <2.0 1.7 <0.50 <100 <50 21.46 47.23 -25.77 - S-3 3/15/2007 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <20 <0.50 <0.50 <0.50 0.85 <0.50 <100 <100 21.46 45.73 -24.27 - S-3 6/5/2007 <50 t <0.50 <1.0 <1.0 <1.0 <1.0 <1.0 <10 <2.0 <2.0 <2.0 0.79 <1.0 <100 t <100 21.46 45.40 -23.94 - S-3 9/17/2007 <50 t <0.50 <1.0 <1.0 1.13 v - <1.0 <10 <2.0 <2.0 <2.0 2.8 <1.0 <100 t <100 21.46 47.41 -25.95 - S-3 12/13/2007 <50 t <0.50 <1.0 <1.0 <1.0 - 1.9 <10 <2.0 <2.0 <2.0 0.90 <1.0 <100 t <100 21.46 47.75 -26.29 - S-3 3/20/2008 <50 t <0.50 <1.0 <1.0 <1.0 - <1.0 <10 <2.0 <2.0 <2.0 4.9 <1.0 <100 t <100 21.46 46.54 -25.08 - S-3 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 21.46 46.96 -25.50 - CRA240797(18)