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� i <br /> Table 2 <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- Vieth- Eth- Ace- Dissolved <br /> Elevation Date Benzene Toluene Benzene Xylene TPHg 8020 MtBE TBA DIPS RBE TAME DCA EDB enol anol tone Notes Oxygen DTW SPT WTE <br /> TpC IL 1L L 1L L 1L 1L L 1L IL 1L L) WILI liallI WWI-) IL m 1L 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 10 20 000 -901 <br /> 153 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 <0 5 — — — 10 747 000 -594 <br /> 07/09/02 <0 5 <0 5 <05 <0 5 <50 <5 24 <5 <0 5 <0 5 <0 5 — — 1 1 790 000 -637 <br /> 10/16/02 <0 5 <0 5 <0 5 <0 5 <50 <5 052 15 <05 <0 5 <0 5 — — 10 943 000 -790 <br /> 03/17/03 <0 50 <0 50 <0 50 <0 50 110 86 <50 <0 50 <0 50 <0 50 — — -- 12 767 000 -614 <br /> 05/29103 <0 50 <0 50 <0 50 <0 50 <50 - 42 <5 0 <0 50 <0 50 <0 50 — — 14 794 000 -641 <br /> 098 09/18/03 <0 50 <0 50 <0 50 <0 50 160 36 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <5 0 <5 0 23 954 000 -856 <br /> 12/02/03 <0 50 <0 50 <0 50 <0 50 <50 17 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <5 0 01 909 000 -811 <br /> MW-8 <br /> 1 90 09/18/03 25 130 64 340 3,200 — 22 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <5 0 <80 c 08 1061 000 -871 <br /> 12/02/03 2 2 4 3 4 7 13 320 — 0 79 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <5 0 — 0 0 985 000 -795 <br /> Explanation <br /> TPHg=Total petroleum hydrocarbons-as-gasohne TAME=Tert-amyl-methyl ether TOC=Top of casing elevation in feet above mean sea level <br /> MtBE=Methyl tert-butyl ether V DCA=1 2-dichloroethane po(L=micrograms per liter <br /> TBA=Tert-Butanol EDB=1 2-dibromoethane mgtL=milligrams per]der <br /> DIPE=Dosopropyl ether DTW=Depth to water —=Not samptedlnot measured <br /> EtBE=Ethyl tert-butyl ether SPT=Separate-phase hydrocarbon thickness <br /> WTE=Water table elevation <br /> Notes <br /> Historical data prior to 03/17/03 sample date provided by Shaw E81 BTEX,TPHg and MtBE analyzed using EPA Method 8020/8015 Modrfied <br /> Samples analyzed using EPA Method 82608 starting with 03/17/03 sample date <br /> a=Method Blank Contamination The associated method blank contains the target analyte ata reportable level <br /> b=Matrix SprkefMatnx Spike Duplicate 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 /> I V-Elevenl7-11 Stores1141175Tables114117 03-40 xlsHistoncal Water Page 6 of 6 <br />