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4r -9 <br /> Table 2 <br /> Historical Groundwater Monitoring Data <br /> 7-Eleven Store No 20632 <br /> 4627 DaVlnci Drive <br /> Stockton,California <br /> Well 101 Ethyl- MTBE MTBE Dissolved <br /> Elevation Benzene Toluene Benzene Xylene TPM-G 8020 8260 TBA DIPS ETBE TAME Oxygen DTW SPT WTE <br /> (TOC) Date (Ng1L) (Ng1L) (NgIL) (}igIL) (ug1L) (Ng/L) (NgIL) (pg/L) (pg1L) (Ng1L) (pg/L) (mg/L) (feet) (feet) (feet) <br /> MW-5 cont. <br /> 05/23/01 12 <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 <0 5 <0 5 12 130 -- 76 <20 <5 <5 <5 10 740 000 -483 <br /> 01/09/02 <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 12 696 000 -439 <br /> 07/10/02 086 <0 5 <0 5 073 <50 77 72 <17 <1 7 <1 7 <17 11 740 000 -483 <br /> MW-6 <br /> 04/10/02 <0 5 <05 <0 5 <05 <50 <5 II <5 <05 <05 <0 5 60 670 000 — <br /> 07/10/02 <0 5 <0 5 <05 <05 <50 <5 13 <5 <0 5 <05 <0 5 14 712 000 — <br /> MW-7 <br /> 04/10/02 <5 77 <5 62 <500 13,000 22,000 <5,000 <500 <500 <500 57 720 000 — <br /> 07/10/02 <10 <10 <10 <10 <1,200 21,000 30,000 <10,000 <1,000 <1,000 <1,000 13 7 65 0 00 -- <br /> EXPLANATM <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 matnx interference <br /> TBA=Tert-Butanol pg/L=micrograms per liter <br /> DIPE=Di-isopropyl ether mgJL=Milligrams per liter <br /> ETRE=Ethyl-tertiary-butyl-ether —=Not available/not sampled <br /> TAME=Tertiery amyl-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 /> I <br /> 7-11120632 tbl xis 4 of 4 08-12-02 <br />