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A . <br /> Historical Groundwater Monitoring and Analytical Data <br /> 7 Eleven Store#14117 <br /> 2725 Country Club Boulevard <br /> Stockton CA <br /> Well IDI Ethyl- MtBE 1,2- Meth- Eth- Ace- Dissolved <br /> Eleva oni ate Benzene Toluene Benzene Xylene TPHg 8020 MtBE TBA DIPE EtBE TAME DCA EDB anol anol tone Notes Oxygen DTW SPT WfE <br /> (T C IL IL IL IL !L IL1...(pg/L) IL IL IL IL ILI WIL) IL 1L !L rn R feet feet feet <br /> MW-7 <br /> 1 19 11/05/01 <0 5 <0 5 <0 5 <0 5 <50 - <5 <20 <5 <5 <5 <5 <5 10 1020 000 -901 <br /> 1 53 01/08/02 - -- - - -- - -- 09 000 <br /> 04/12/02 <0 5 <0 5 <0 5 <0 5 <50 <5 24 <5 <0 5 <0 5 <05 - - 10 747 000 -594 <br /> 07/09/02 <0 5 <0 5 <0 5 <0 5 <50 <5 24 <5 <0 5 <05 <0 5 1 1 790 000 -637 <br /> 10/16/02 <0 5 <0 5 <0 5 <0 5 <50 <5 052 15 <0 5 <0 5 <0 5 10 943 000 -790 <br /> 03/17/03 <0 50 <0 50 <0 50 <0 50 110 86 <5 0 <0 50 <0 50 <0 50 -- - -- 12 767 000 -6 14 <br /> 05/29/03 <0 50 <0 50 <0 50 <0 50 <50 -- 42 <5 0 <0 50 <0 50 <0 50 - -- - 14 794 000 -641 <br /> 09/18/03 <0 50 <0 50 <0 50 <0 50 160 36 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <5 0 23 954 000 -801 <br /> MW-8 <br /> 09/18/03 25 130 64 340 3,200 22 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <5 0 <8 0 C E1061 000 -- <br /> Explanation <br /> TPHg=Total petroleum hydrocarbons as-gasoline TAME=Tertamyl-methyl ether TOC=Top of casing elevation in feet above mean sea level <br /> MtBE=Methyl tert-butyl ether 12 DCA=1 2-dichloroethane pg/L=micrograms per liter <br /> TBA=Tert Butanol EDB=1 2-dibromoethane mg1L=milligrams per liter <br /> RIPE=Dssppropyl ether DTW=Depth to water ft=feet <br /> E1BE=Ettryl tert-butyl ether SPT=Separate phase hydrocarbon thickness --=Not sampled/not measured <br /> WTE=Water table elevation <br /> Notes <br /> Historical data prior to 03/17/03 sample date provided by Shaw E&I BTEX TPHg and MtBE analyzed using EPA Method 8020/8015 Modified <br /> All samples analyzed using EPA Method 82508 starting with 03/17/03 sample dale <br /> a=Method Blank Contamination The associated method blank contains the target analyte at a reportable level <br /> b=Matrix SpikelMatnx Spike Dupluate for the analytes Benzene MtBE was affected by the analyte concentrations already present in the un spiked sample <br /> C=The Method Reporting Limit for Acetone has been increased due to the presence of an interfering compound <br /> 117 Etevenl7 11 Storest141171Tables114117 03-30 a xlsHistorical Water <br /> Page 6 of 6 <br />