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i <br /> Table 2 <br /> Historical Groundwater Monitoring and Analytical Data <br /> 7-Eleven Store#21756 <br /> 853 East Yosemite Avenue <br /> Manteca CA <br /> Well ID/ Ethyl- MtBE 1,2- Dissolved <br /> Elevation Date Benzene Toiuene Benzene Xylene TPH-9 8020 MtBE TBA DIPE EtBE TAME DCA EDB Dates Oxygen DTW SPT WTE <br /> TOC (u n} ( �) 1L ( L} (u ( (N n n /L [N L fL} m (feet} feet (feet <br /> MW-4 <br /> 34 13 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 -- - 16 1916 000 14 97 <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 18 04 000 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 000 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 /> 10/23/03 <0 50 <0 50 <0 50 <0 50 <50 -- <0 50 <5 0 <0 50 <0 50 <0 50 -- - b 61 2191 000 1222 <br /> 01/13/04 <0 50 <0 50 <0 50 <0 50 <50 -- <0 50 <5 0 <0 50 <0 50 <0 50 -- — 47 2021 000 1392 <br /> Explanation <br /> TPHg=Total petroleum hydrocarbons-as-gasoline 1 2-DCA=1 2 Dichloroethane pg/L=micrograms per liter <br /> MtBE=Methyl-tert-butyl ether EDB=1 2-Dibromoethane mg/L=milligrams per liter <br /> TBA=Teri-butanol DTW=Depth to water —=Not sampledlnot measured <br /> DIPE=Dusopropyl ether SPT=Separate-phase hydrocarbon thickness <br /> EtBE=Ethyl-tert-butyl ether WTE=Water table elevation <br /> TAME=Tert-amyl-methyl ether FOC=Top of casing elevation in feet above mean sea level <br /> Notes <br /> Historical data prior to 03/10/03 sample date provided by Shaw E&I BTEX TPHg and MtBE analyzed using EPA Method 8 02 018 01 5 Modified <br /> Samples analyzed using EPA Method 82608 starting with 03/10/03 sample date <br /> a=Method Blank Contamination The associated method blank contains the target analyte at a reportable level <br /> b=Matrix Spike/Matrix Spike Duplicate Results associated with Sample MW4 for Toluene and Benzene were outside of control limits due to an inconsistency between vials <br /> Since the LCS recoveries were within control limits no data are flagged <br /> c=Less than 0 5 feel of water in well Groundwater sample not collected <br /> 117-Elevenl7-11 Stores1217561Tables121756 04-1Q xlsHcstoncal Water Page 4 of 4 <br />