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f <br /> Table 2 <br /> Historical Groundwater Monitoring Data <br /> 7-Eleven Store No 20632 <br /> 4627 DaVlncl Drive <br /> i Stockton,California <br /> e <br /> Well IDI Ethyl- MTBE [86 <br /> TBE Dissolved <br /> Elevabon Benzene Toluene Benzene Xylene TPH-G 8020260 TBA RIPE ETBE TAME Oxygen DTW SPT WTE <br /> {TOC} Date (}ag/L) (NgIL) (NgIL) (NgIL) (I�gIL) (PgIL) g1L) (IIgIL) (tIg/L) (Ng1L) (ug1L) (mg1L) (feet) (feet) (feet) <br />� <br /> MW-6 cont <br /> 05/23/01 1 2 <0 5 <05 <1 <100 – <50 <2 <2 I <2 20 693 000 4 36 <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 <0 5 <0 5 12 130 – 76 <20 <5 <5 <5 10 740 000 -483 <br /> p 01/09102 <5 <5 <5 <5 <50 – 52 <20 <5 <5 <5 09 500 000 -243 <br /> 04/10/02 20 <0 5 <0 5 <0 5 92 85 80 <25 <2 5 <2 5 <2 5 1 2 696 000 -439 <br /> f+AW-fi <50 <5 1 1 <5 <0 5 <0 5 <0 5 6 0 6 70 000 <br /> 04/10/02 <0 5 <0 5 <0 5 <0 5 _ <br /> MW-7 <br /> 04/10/02 <5 77 <5 5 2 <500 13,000 22,000 t <5,000 <500 <500 <500 57. 720+000 <br /> l -- — -- - <br /> EXPLANATION <br /> TPH G=Total petroleum hydrocarbons as-gasolene 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 pglL=micrograms per liter <br /> OIPE=De-isopropyl ether mg1L=Milligrams per liter <br /> ETRE=Ethyl tertiary-butyl-ether --=Not available/not sampled <br /> TAME=Terteery-amyl-methyl ether TOC=Top of casing elevation(en 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 tbl As 4 of 4 05-31-02 <br />