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i <br /> Ta 2 <br /> Historical Groundwater Monitoring and Analytical Data <br /> 7-Eleven Store#21756 <br /> 853 East Yosemite Avenue <br /> Manteca CA <br /> We11 IDI Ethyl- MtBE 1,2- Dissolved <br /> Elevation Date Benzene Toluene Benzene Xylene TPHg 8020 MtBE TBA DIPS EtBE TAME DCA EDB Notes Oxygen DTW SPT WTE <br /> TOG (N lL) (N L) (!j IL) (u ) (u 1L) (u ) (N (NIL) (V ) (liL) (N ) (u ) (P ) (m ) (feet) (fee) (feet) <br /> MWA <br /> 3413 04/08/02 <0 5 <0 5 <0 5 <0 5 <50 -- <0 5 <5 <0 5 <0 5 <0 5 -- -- 19 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 1497 <br /> 10101/02 <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 000 1639 <br /> 07116/03 <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 21 91 000 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 /> 09/03/04 <0 50 <0 50 <0 50 <0 50 <50 -- <0 50 <5 0 <0 50 <0 50 <0 50 — -- 6 7 2221 000 11 92 <br /> 02/11/05 <0 50 <0 50 <0 50 <0 50 <50 -- <0 50 <5 0 <0 50 <0 50 <0 50 -- — 3 9 1755 000 1658 <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=1 2-Dibromoethane mglL=milligrams per liter <br /> TBA=Tert-butanol DTW=Depth to water —=Not sampled/not 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 TOC=Top of casing elevation in feet above mean sea level <br /> Notes <br /> Historical data pnor to 03/10/03 sample date provided by Shaw E&I BTEX TPHg and MtBE analyzed using EPA Method 802018015 Modified <br /> Samples analyzed by EPA Method 8260B 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 SpikelMatnx Spike Duplicate Results for Toluene and Benzene were outside of control limits due to an inconsistency between vials Since the LCS recoveries were within control limits no data are flagged <br /> c=Less than 0 5 feet of water in well Groundwater sample not collected <br /> d=Matnx SpikelMatnx Spike Duplicate Results associated with the analyte MtBE were affected by the analyte concentrations already present in the un-spiked sample <br /> 117-Elevenl7-11 Stores12175617rables121756 Current Groundwater xlsHistoncal Water 4 of 4 <br />