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19LE 1 <br /> WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 3725 Tracy Boulevard <br /> Tracy, California <br /> WIC#204-7884-0901 <br /> Sample Measured 7GWEI'ev <br /> SP TPPH B T E X MTBE Methanol Comments <br /> GW Depth Date (ft) (ft) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) <br /> MW-1 A* Top casing elevation (ft) 9701 <br /> 26-Sep-89 NA NA NA <50 <0 5 <2 <2 <2 NA NA <br /> 28-Aug-90 NA NA NA <50 <0 5 <0 5 <0 5 <0 5 NA NA <br /> 19-Nov-90 NA NA NA <50 <0 5 <0 5 <0 5 <0 5 NA NA <br /> 26-Feb-91 895 8806 000 <50 <0 5 <0 5 I <0 5 <0 5 NA NA <br /> 17-May-91 911 8790 0 00 <50 <0 5 <0 5 <0 5 <0 5 NA NA <br /> 20-Aug-91 <br /> 945 8756 000 <50 <0 5 <0 5 <0 5 <0 5 NA NA <br /> 21-Nov-91 928 8773 000 <50 <0 5 <0 5 <0 5 <0 5 NA NA <br /> 14-Feb-92 855 8846 000 <50 <0 5 <0 5 <0 5 <0 5 NA NA <br /> 20-Feb-93 754 8947 000 <50 <0 5 <0 5 <0 5 <0 5 NA NA <br /> 15-Feb-94 902 1 8799 000 <50 <0 5 <0 5 <0 5 <0 5 NA NA <br /> 23-Feb-95 878 8823 000 <50 <0 5 <0 5 <0 5 <0 5 NA NA <br /> 29-Feb-96 800 8901 000 70 <0 5 <0 5 <0 5 <0 5 NA NA <br /> 30-Apr-96 907 8794 000 2700 <0 5 <0 5 <0 5 <0 5 NA NA <br /> 20-Aug-96 994 8707 000 <10000 <100 <100 <100 <100 39000 NA MTBE by 8260 45000 ppb <br /> 07-Feb-97 830 8871 000 <1000 <10 <10 <10 <10 3600 NA <br /> 05-Jun-97 941 8760 000 <5000 <50 <50 <50 <50 23000 NA <br /> ND for VOCs by 8260 and <br /> 27-Aug-97 978 8723 000 <250 <2 5 <2 5 <2 5 <2 5 73000 20000 Oxygenate Compounds except for <br /> MTBE 77000 ppb <br /> 19-Nov-97 939 8762 000 <500 <5 0 <5 0 <5 0 <5 0 66000 21000 except <br /> Oxygenate Compounds for MTBE 7i000ND <br /> ND <br /> 11-Feb-98 767 8934 000 <50 <0 50 <0 50 <0 50 <0 50 81 <100D <br /> 20-May-98 852 8849 000 180 1 1 21 <0 50 34 950 <1000 <br /> 13-Aug-98 949 8752 ' 000 <50 45 <0 50 <0 50 20 190 <1000 <br /> 240-0813 1 <br />