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• Ta02 <br /> Historical 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- Eth. Meth- Dissolved <br /> Elevation Date Benzene Toluene Benzene Xylene TPH-G 8020 MtBE TBA DWE EtBE TAME DCA anol anol Notes Oxygen DTW SPT WTE <br /> TOC (pglL) (pgfL) (pglL) (pglL) {pglL) {pglL) (yg1L) (pglL) {p lL) (pglL) (pglL) (pglL) (mg1L) (mg1L) (mglL) (feet) (feet) (feet) <br /> MW-7 <br /> 3245 10/12/00 -- - -- -- -- -- -- -- -- -- -- -- -- <br /> 01/16/01 095 <0 5 1 5 23 <100 -- 56 <50 <2 <2 <2 -- -- -- c 0 6 1864 000 1381 <br /> 04/02/01 <0 5 <0 5 12 27 150 -- 42 <50 <2 <2 <2 -- -- 10 1944 000 1301 <br /> 06/26/01 <0 5 <0 5 1 5 27 170 -- 55 <50 <2 <2 <2 -- -- -- 0 9 21 70 000 1075 <br /> 11/28/01 <0 5 <0 5 <0 5 <0 5 57 -- <5 <20 <5 <5 <5 __ -- 1 0 2181 000 10 64 <br /> 01/30/02 <0 5 <0 5 <0 5 062 91 -- 13 <20 <5 <5 <5 -- - 1 0 1956 000 1289 <br /> 04/04/02 <0 5 <0 5 <0 5 <0 5 <50 8 2 8 6 <5 <0 5 <0 5 <0 5 -- -- 1 3 2037 000 1208 <br /> 07/08/02 <0 5 0 85 <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 <0 5 <0 5 <0 5 <50 <5 2 6 <5 <0 5 <0 5 <0 5 - -- -- 1 1 2080 000 1165 <br /> 03/11/03 <0 50 <0 50 <0 50 <0 50 <50 -- 1 1 <5 0 <0 50 <0 50 <0 50 - -- 3 8 20 38 0 00 12 07 <br /> 06/27/03 <0 50 <0 50 <0 50 <0 50 <50 -- 095 <50 <0 50 <0 50 <0 50 -- -- - 0 5 2148 000 1097 <br /> 09/15/03 <0 50 <0 50 <0 50 <0 50 <50 -- 26 <50 <0 50 <0 50 <0 50 -- -- - 06 21 74 000 1071 <br /> Explanation <br /> TPHg=Total petroleum hydrocarbons-as-gasoline 1 2-13CA=1 2-Dichloroethane pg1L=micrograms per liter <br /> MtBE=Methyl-tert-butyl ether DTW=Depth to water mglL=milligrams per liter <br /> TBA=Tert-butanol SPT=Separate-phase hydrocarbon thickness —=Not sampled/not measured <br /> D[PE=Dusopropyl ether WTE=Water table elevation <br /> EtBE=Ethyl-tert-butyl ether TOC=Top of casing elevation In feet above mean sea level <br /> TAME=Tert amyl-methyl ether <br /> Notes <br /> Historical data prior to 03107103 sample date provided by Shaw E&1 BTEX TPHg and MtBE analyzed using EPA Method 8020/8015 Modified <br /> Samples analyzed using EPA Method 8260B 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 MW 1 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 Shaws Historical Table <br /> e=Matrix Spike/Matrix Spike Duplicate Results for Benzene Toluene and MtBE were affected by the analyte concentration already present In the un-spiked sample <br /> f=Samples from MW-5 and MW-5A inadvertently sampled from the wrong well casing on 3111103 and 6127!03 The sample reported as MW 5 was collected from MW-5A and the sample reported as MW 5A"was <br /> collected from MW 5 <br /> 117-Elevenl7-11 Stores1199761Tables119976 03 30 xlsHistoncal Water Page 9 of 9 <br /> i <br />