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Table 2 <br /> i <br /> Historical Groundwater Monitoring Data <br /> 7-Eleven Store No 20632 <br /> 4627 DaVlnci Drive <br /> Stockton,California <br /> Well IDI Ethyl- MTBE MTBE Dissolved <br /> Elevation Benzene Toluene Benzene Xylene TPH-G 8020 8260 TBA DIPE ETBE TAME Oxygen DTW SPT !JUTE <br /> (TOG) Date (pglL) (pg/L) (pg[-1 (pg/L) (lig/L) (pg/L) (pg/L) (pg/L) (pg/L) (NgIL) (pg/L) (mgIQ (feet) (feet) (feet) <br /> MW-5 cont <br /> 05116/00 1 <0 5 <0 5 099 <1 <100 -- 160 <100 <4 <4 <4 06 637 000 -380 <br /> 08/08/00 28 <0 5 44 22 <100 — 160 <120 <5 <5 <5 04 735 000 -478 <br /> 11/15/00 29 <05 36 28 170 — 59 <50 <2 <2 <2 06 675 000 -418 <br /> 02/07/01 <0 5 <0 5 0 72* <1 5 <100 — 24 <50 <2 <2 <2 07 660 000 -403 <br /> 05/23/01 1 2 <0 5 <0 5 <1 <100 -- 86 <50 <2 <2 <2 20 693 000 -436 <br /> 08/21/01 <0 5 <0 5 067 1 <100 -- 26 <50 <2 <2 <2 01 757 000 -500 <br /> 11/05/01 22 <05 <0 5 12 130 -- 76 <20 <5 <5 <5 10 740 000 -483 <br /> 01/09102 <5 <5 <5 <5 <50 -- 62 <20 <5 <5 <5 0 9 500 000 -243 <br /> 04/10/02 20 <0 5 <0 5 <0 5 92 85 80 <25 <2 5 <2 5 <2 5 12 696 000 -439 <br /> 07/10102 086 <0 5 <0 5 073 <50 77 72 <17 <1 7 <17 <17 1 1 740 000 4 83 <br /> 10/16/02 11 1 8 23 13 220 85 75 <25 <2 5 <2 5 <25 10 760 000 -503 <br /> MW-6 <br /> 04110/02 <0 5 <0 5 <0 5 <0 5 <50 <5 1 1 <5 <0 5 <0 5 <0 5 6 0 670 000 -- <br /> 2 38 07/10/02 <0 5 <0 5 <0 5 <0 5 <50 <5 13 <5 <0 5 <0 5 <05 14 712 000 -474 <br /> 10/16102 <0 5 <0 5 <5 <0 5 <50 <5 14 <5 <0 5 <0 5 <0 5 10 740 000 -502 <br /> MW-7 (4 74) <br /> 04/10102 <5 77 <5 5 2 <500 13,000 22,000 <5,000 <500 <500 <500 57 720 000 <br /> 273 07/10/02 <10 <10 <10 <10 <1,200 21,000 30,000 <10,000 <1,000 <1 000 <1,000 13 765 000 -492 <br /> 10!16102 <12 <12 <12 <12 <1,200 32,000 31,000 <5,000 <500 <500 <500 1 2 795 000 -5-221 <br /> EXPLANATION <br /> TPH-G=Total petroleum hydrocarbons as gasoline SPT=Separate-phase hydrocarbon thickness E=Estimated result Result concentration exceeds the calibration range <br /> MTBE=Methyl tert-butyl ether WTE=Water table elevation G=Elevated reporting limit The reporting limit is elevated due to matrix interference <br /> TBA=Tert-Butanol pg/L=micrograms per liter <br /> DIPS=Di-isopropyl ether mg/L=Milligrams per liter <br /> ETRE=Ethyl-tertiary-butyl-ether —=Not avadabietnot sampled <br /> TAME=Tertery-amyt methyl ether TOC=Top of casing elevation(in feet above mean sea level) <br /> DTW=Depth to water Method Blank Contamination Method blank contains target analyte at a reportable level <br /> 7-11120632 V As 4 of 4 11-04-02 <br />