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� A <br /> First Quarter 2003 Groundwater Monitoring and Analytical Data <br /> 7-Eleven Store#19976 <br /> 1399 North Main Street <br /> Manteca CA <br /> Well IDI Ethyl- MtBE 1,2- 2Eth- Meth- Dissolved <br /> Elevatton Date Benzene Toluene Benzene Xylene TPH-G 8020 MtBE TBA DIPE EtBE TAME DCA anol Notes Oxygen DTW SPTTOC (pglL) (PgL) (pg1L) (pg/L) (pg/L) (11g1L) (PgfL) (P91L) (v91L) (pg1L) (pg1L) (pglL) ( (mall-] (mglL] (feet) (feet) (feet) <br /> MW-7 <br /> 3245 10/12/00 -- -- -- — -- -- <br /> 01/16/01 095 <05 1 5 23 <100 -- 56 <50 <2 <2 <2 -- -- -- C 06 1864 000 1381 <br /> 04/02/01 <0 5 <0 5 1 2 27 150 -- 4 2 <50 <2 <2 <2 -- -- 1 0 1944 000 1301 <br /> 06/26/01 <0 5 <0 5 1 5 27 170 -- 55 <50 <2 <2 <2 -- 09 2170 000 1075 <br /> 11/28/01 <0 5 <05 <0 5 <0 5 57 -- <5 <20 <5 <5 <5 - -- -- 10 2181 000 10 64 <br /> 01/30/02 <0 5 <05 <0 5 052 91 -- 13 <20 <5 <5 <5 -- -- -- 1 0 1956 000 1289 <br /> 04/04/02 <0 5 <0 5 <05 <0 5 <50 8 2 86 <5 <0 5 <05 <0 5 -- -- - 13 2037 000 1208 <br /> 07/08/02 <0 5 08S <0 5 <0 5 69 <5 38 <5 <0 5 <0 5 <0 5 -- -- - 1 1 21 50 000 1095 <br /> 10/03/02 <0 5 <05 <0 5 <0 5 <50 <5 2 6 <5 <0 5 <05 <0 5 -- -- - 1 1 2080 000 11 65 <br /> 03/11/03 <0 50 <0 50 <0 50 <0 50 <50 -- 11 <5 0 <0 50 <0 50 <050 -- -- -- 38 2038 0110 12 07 <br /> 06/27/03 <050 <0 50 <0 50 <0 50 <50 -- 095 <50 <0 50 <0 50 <0 50 -- -- 05 2148 000 1097 <br /> Explanation <br /> TPHg=Total petroleum hydrocarbons-as gasoline t 2-DCA=1 2-Dichloroethane pg1L=micrograms per liter <br /> MtBE=Methyl-tert-butyl ether DTW=Depth to water mg/L=milligrams per liter <br /> TBA=Tert-butanol SPT=Separate-phase hydrocarbon thickness ft=feet <br /> DIPE=Diisopropyl ether WTE=Water table elevation —=Not sampled/riot measured <br /> EtBE=Ethyl-tert-butyl ether TOC=Top of casing elevation in feet above mean sea level <br /> TAME=Tert-amyl methyl ether <br /> I <br /> Notes <br /> Historical data pnor to 03/07/03 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 8260E starting with 03/11/03 sample date <br /> a=Deep zone well <br /> b=Laboratory results for the 11/04199 samples collected from the nested wells MWA and MW-1A were switched The table shows corrected data <br /> c=Method Blank Contamination The method blank contains the targeted analyte at a reportable level <br /> d=Data Missing from Shaw s Historical Table <br /> e=Matnx SpikelMatnx Spike Duplicate Results for Benzene Toluene and MtBE were affected by the analyte concentration already present in the un-spiked sample <br /> 117-Eleven\7 11 Stores1199761Tabies\19976 03 2Q xlsHistoncal Water Page 8 of 8 <br />