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404 N W set lane <br /> • Walnut Geek CA 94598 <br /> Sequoia (925)988-9600 <br /> FAX(925)988-9673 <br /> Analytical `rww seqt>olWabs com <br /> Gettler Ryan,Inc -Dublin Project Chevron <br /> 6747 Sierra Court Suite I Project Number Chevron# 9-6171 Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 06-Mar-01 12 03 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical -Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Lututs RPD Lutut Notes <br /> Batch 1B27013-EPA 5030B [PITT <br /> LCS(IB27013-BS2) Prepared&Analyzed 28-1~eb-01 <br /> Methyl tert-butyl ether 423 20 ug/l 500 846 70-130 <br /> Surrogate Dibromofluoromethane 483 Soo 966 50-150 <br /> Surrogate 11-Dichloroethame-d4 414 Soo 828 50-150 <br /> Matrix Spike(1B27013-MSI) Source W102476-10 Prepared 27-Feb-01 Analyzed 28-Feb-01 <br /> Methyl tert-butyl ether 440 20 ug/1 500 ND 880 60-150 <br /> Surrogate Dibromofluoromethane 493 500 986 50-150 <br /> Surrogate 1 2-Dichloroeihane-d4 416 500 832 50-150 <br /> Matrix Spike(IB27013-MS2) Source W102476-11 Prepared&Analyzed 28-Feb-01 <br /> Methyl tort-butyl ether 439 20 ug/l 500 ND 854 60-150 <br /> Surrogate Dibromofluoromethane 506 500 101 50-150 <br /> P,Ir <br /> are 12Dichloroethane-d4 438 500 876 50-150 <br /> ix Spike Dup(1B27013-MSD1) Source W102476-10 Prepared 27-Feb-01 Analyzed 28-Feb-01 <br /> Methyl tert-butyl ether 503 20 ug/1 500 ND 101 60-150 138 25 <br /> Surrogate Dibromofluoromethane 511 500 102 50.150 <br /> Surrogate 1 2-Dichloroethane-d4 435 500 870 50.150 <br /> Matrix Spike Dup(1B27013-MSD2) Source W102476-11 Prepared&Analyzed 28-Feb-01 <br /> Methyl teat-butyl ether 491 20 Ug/1 500 ND 958 60-150 112 25 <br /> Surrogate Dibromofluoromethane 501 500 100 50.150 <br /> Surrogate l,2-Drchlor*edww-d4 437 500 874 50-150 <br /> ola Analytical-Walnut Creek The results in rhes report apply to the samples analyzed in accordance with the ehmn of <br /> custody document This analytical raeporl must be reproduced in its entirety <br /> Page 8 of 11 <br />