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Tabil Historical Groundwater Analytical Results 7-Eleven Store#17647 1048 W Yosemite Avenue Manteca California Well ID/ Ethyl- MTBE MTBE Dissolved Elevation Benzene Toluene Benzene Xylene TPH-G 8020 8260 TBA DIPE ETRE TAME Oxygen RTW SPT WTE (TOC) Date ()jg1L) (Ng1L) (NgIL) (Ng/L) (pg/L) (Ng1L) (Ng1L) (NgIL) (Ng1L) (Ng1L) (NgIL) (mg1L) (feet) (feet) (feet) MW-1 3114 01/25/00 <0 3 <0 3 <0 3 <0 6 <50 <5 <5 <20 <5 <51 <5 08 1380 000 11734 04/07/00 <0 5 <0 5 <0 5 <1 <100 -- <1 <50 <2 <2 <2 1 5 1290 000 1824 07/20/00 <0 5 <0 5 <0 5 <1 <100 — <1 <50 <2 <2 <2 06 1417 000 1697 10/13/00 <0 5 <0 5 <0 5 <1 <100 -- <1 <50 <2 <2 <2 1 7 1500 000 1614 MW-2 30 49 01/25/00 <0 3 <0 3 <0 3 <0 6 <50 <5 <5 <20 <5 <51 <5 0 7 1317 000 1732 04/07/00 <0 5 <0 5 <0 5 <1 <100 -- <1 <50 <2 <2 <2 21 1232 000 1817 07/20/00 <0 5 <0 5 <0 5 <1 <100 <1 <50 <2 <2 <2 1 0 1380 000 1669 10/13100 <0 5 <0 5 <0 5 <1 <100 -- <1 <50 <2 <2 <2 1 5 1450 000 1599 I MW-3 30 36 01/25/00 094 <0 3 <0 3 <0 6 81 852 108 111 <5 <51 <5 1 0 1317 000 1719 04/07/00 <0 5 <0 5 <0 5 <1 <100 — 26 <50 <2 <2 <2 0 5 1228 000 1808 07/20/00 <0 5 <0 5 <0 5 <1 <100 -- 54 <50 <2 <2 <2 -- 1368 0 00 1668 10/13/00 <0 5 <0 5 <0 5 <1 <100 -- 31 <50 <2 <2 <2 0 4 1443 000 1593 EXPLANATIQN ft=feet TPH G=total petroleum hydrocarbons as-gasoline SPT=separate phase hydrocarbon thickness EDB=1 2-Dibromoethane WTE=Water table elevation in feet above mean sea level 1 2-DCA=1 2-Dichloroelhane --=Not sampledlnot measured MTBE=Methyl-tert-butyl ether ND=Not detected at or above the laboratory method detection limit TBA=tert-Butanol NA=Not available DIPE=Dnsoprophyl ether TOC=Top of casing elevation(in feet above mean sea level) ETBE=Ethyl tert-butyl ether a=Reported value for Total Xylenes is from 20OX dilution sample re-analysis TAME=tert-Amylmethyl ether `=1 out of 2 surrogates was outside control limits due to matrix effects pg/L=micrograms per liter All values are to be considered estimates Page 1 of 1