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TO • <br /> Historical Groundwater Monitoring and Analytical Data <br /> 7-Eleven Store#21756 <br /> 853 East Yosemite Avenue <br /> Manteca CA <br /> Well IDI Ethyl- MtBE 1,2- Dissolved <br /> Elevation Date Benzene Toluene Benzene Xylene TPH-G 8,020 MtBE TBA DIPS EtBE TAME DCA EDB Notes Oxygen DTW I SPT WTE <br /> TOC (}a ft) (pgfL) ( !L) (NgfL (N 1L) (pglL (p !L} {pglL (w 1L} {Ng1L} (Ng1L) (pg/L} (p 1Li m 1L) feet} (feet) {feet} <br /> MW-3 <br /> 3631 01/25/00 <0 3 <0 3 <0 3 <0 6 <50 718 119 <20 <5 <5 <5 — <1 1 0 1702 000 1929 <br /> 04/07/00 <0 5 <0 5 <0 5 <1 <100 35 <50 <2 <2 <2 23 1595 000 2036 <br /> 07/20/00 <0 5 <0 5 <0 5 <1 <100 — 73 <50 <2 <2 <2 -- 07 18 65 000 1766 <br /> 10/13/00 <0 5 <0 5 <0 5 1 7 <100 — <1 <50 <2 <2 <2 — 07 1949 000 1682 <br /> 01/15/01 <0 5 <0 5 086 1 7 <100 -- 21 <50 <2 <2 <2 — a 1 6 1770 000 1861 <br /> 04/04/01 <0 5 <0 5 <0 5 <1 <100 -- 36 <50 <2 <2 <2 — — 08 1801 000 1830 <br /> 06/27/01 098 08 068 32 <100 23 <50 <2 <2 <2 09 1921 000 1710 <br /> 10/04/01 <0 5 099 <0 5 17 <50 <5 <20 <5 <5 <5 -- — 24 21 50 000 1481 <br /> 01/07/02 <0 5 1 056 29 <50 — <5 <20 <5 <5 <5 -- — 21 1827 000 1804 <br /> 04/08/02 <0 5 <0 5 <0 5 <0 5 <50 -- <0 5 <5 <0 5 <0 5 <0 5 — 1 9 1920 000 1711 <br /> 07/01/02 <0 5 <0 5 <0 5 061 <50 <5 <0 5 <5 <0 5 <0 5 <0 5 — 12 21 16 000 1515 <br /> 10/01/02 <0 5 <0 5 <0 5 <05 <50 <5 <0 5 <5 <0 5 <0 5 <0 5 — — 10 21 73 000 1458 <br /> 03/10/03 <0 50 <0 50 <0 50 <0 50 <50 -- <0 50 <5 0 <0 50 <0 50 <0 50 -- 26 2021 000 1610 <br /> 04/17/03 <0 50 <0 50 <0 50 <0 50 <50 — <0 50 <50 <0 50 <0 50 <0 50 — — 30 1979 000 1652 <br /> 07/16/03 <0 50 <0 50 <0 50 <0 50 <50 — <0 50 <5 0 <0 50 <0 50 <0 50 — — 60 2244 000 1387 <br /> MW-4 <br /> 3413 04/08/02 <0 5 <0 5 <0 5 <0 5 <50 — <0 5 <5 <0 5 <0 5 <0 5 — — 1 9 1712 000 1701 <br /> 07/01/02 <0 5 <0 5 <0 5 078 <50 <5 <0 5 <5 <0 5 <0 5 <0 5 — — 1 6 1916 000 1497 <br /> 10/01/02 <0 5 <0 5 <0 5 <0 5 <50 <5 <0 5 <5 <0 5 <0 5 <0 5 — 1 1 1973 000 1440 <br /> 03/10/03 <0 50 <0 50 <0 50 <0 50 <50 -- <0 50 <5 0 <0 50 <0 50 <0 50 -- 76 1804 000 1609 <br /> 04/17/03 <0 50 <0 50 <0 50 <0 50 <50 — <0 50 <5 0 <0 50 <0 50 <0 50 -- — 28 1774 0 00 1639 <br /> 07/16/03 <0 50 <0 50 <0 50 <0 50 <50 — <0 50 <5 0 <0 50 <0 50 <0 50 — — 54 2044 000 1369 <br /> Explanation <br /> TPHg=Total petroleum hydrocarbons as-gasoline 1 2-DCA=1 2-Dichloroethane pg1L=micrograms per liter <br /> MtBE=Methyl-tert-butyl ether EDB=7 2-Dibromoethane mg/t_=milligrams per Mer <br /> TBA=Tert butanol DTW=Depth to water ft=feet <br /> RIPE=Dusopropyl ether SPT=Separate-phase hydrocarbon thickness - =Not sampled/not measured <br /> ELBE=Ethyl tert-butyl ether WTE=Water table elevation <br /> TAME=Tert-amyl methyl ether TOC=Top of casing elevation in feet above mean sea level <br /> Notes <br /> Historical data prior to 03110/03 sample date provided by Shaw E&I STEX TPHg and MTBE analyzed using EPA Method$02018015 Modified <br /> All samples analyzed using EPA Method 82608 starting with 03!10103 sample date <br /> a=Method Blank Contamination The associated method blank contains the target analyte at a reportable level <br /> 117-Elevenl7 11 Stores1217561Tables121756 03-30 AsHistoncal Water Page 2 of 2 <br />