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TABLE 4 Page 12 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) (Pvt) (PNE) (PRE) (pg/L) (pg/L) (Pg/L) (Pg/L) (pg/L) (ft MSL) (ft TOC) (ft MSL) (feet) S-6 9/11/2008 68 <0.50 <1.0 <1.0 <1.0 32 <10 <2.0 <2.0 <2.0 4.2 <1.0 210 t <100 20.66 48.40 -27.74 - S-6 11/26/2008 <50 <0.50 <1.0 <1.0 <1.0 - 25 <10 <2.0 <2.0 <2.0 3.6 <1.0 <100 t <100 20.66 49.12 -28.46 - S-6 3/11/2009 74 <0.50 <1.0 <1.0 <1.0 21 <10 <2.0 <2.0 <2.0 2.6 <1.0 <100 t <100 20.66 49.40 -28.74 - S-6 5/19/2009 <50 <0.50 <1.0 <1.0 <1.0 - 14 <10 <2.0 <2.0 <2.0 2.3 <1.0 <100 t <100 20.66 49.35 -28.69 - S-6 11/16/2009 <50 <0.50 <1.0 <1.0 <1.0 9.6 <10 <2.0 <2.0 <2.0 2.5 <1.0 <100 t <100 20.66 51.82 -31.16 - S-6 5/21/2010 <50 <0.50 <1.0 <1.0 <1.0 - 12 <10 <2.0 <2.0 <2.0 2.5 <1.0 <100 t <100 20.66 48.68 -28.02 - S-6 12/30/2010 <50 <0.50 <1.0 <1.0 <1.0 10 <10 <2.0 <2.0 <2.0 2.6 <1.0 <100 t <100 20.66 47.71 -27.05 - S-6 6/6/2011 <50 <0.50 <0.50 <0.50 <1.0 - 9.7 <10 <1.0 <1.0 <1.0 2.7 <0.50 <500 <150 20.66 44.93 -24.27 - S-6 12/8/2011 <50 <0.50 <0.50 <0.50 <0.50 3.79 <10 <0.50 - - <0.50 <0.50 <10,000w - 20.66 43.66 -23.00 - S-6 6/4/2012 <50 <0.50 <0.50 <0.50 <0.50 - 10 <10 <0.50 - - 2.3 <0.50 - - 20.66 41.88 -21.22 - S-6 12/17/2012 <50 0.68 <0.50 <0.50 <1.0 9.5 <10 <0.50 - - 1.7 <0.50 <500 - 20.66 42.41 -21.75 - S-6 6/18/2013 <50 1.1 <0.50 <0.50 <1.0 - 11 <10 <0.50 - - 1.5 <0.50 <500 - 20.66 42.33 -21.67 - Production Well 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 - - - - Abbreviations and Notes: TPHg=Total petroleum hydrocarbons as gasoline by EPA Method 8260B;prior to May 14,2001,analyzed by EPA Method 8015,except where noted. BTEX=Benzene,toluene,ethylbenzene,xylenes by EPA Method 826013;prior to May 14,2001,analyzed by EPA Method 8020,except where noted. MTBE=Methyl tertiary butyl ether TBA=Tertiary butyl alcohol or tertiary butanol,analyzed by EPA Method 8260B DIPE=Di-isopropyl ether,analyzed by EPA Method 8260B ETBE=Ethyl tertiary butyl ether,analyzed by EPA Method 8260B TAME=Tertiary amyl methyl ether,analyzed by EPA Method 8260B 1,2-DCA=1,2-Dichloroethane,analyzed by EPA Method 8260B EDB=1,2-Dibromoethane,analyzed by EPA Method 8260B TOC=Top of Casing Elevation in feet relative to mean sea level(MSL) SPH=Separate-Phase Hydrocarbons GW=Groundwater µg/L=Micrograms per liter(Parts per billion). ft.=Feet <n=Below detection limit -=Not applicable a=Pre-Development water level. b=Post-Development water level. c=This sample analyzed outside of EPA recommended holding time. d=TPPH and BTEX analyzed by EPA Method 8260B. CRA240797(18)