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404 N Wiget Lane <br /> Sequoia Walnut Creek CA 4 450980 <br /> Analytical Fw equo lat)s 73 <br /> www sequoialabs m <br /> Gettler Ryan,Inc -Dublin Project Chevron <br /> 6747 Sierra Court Suite J ProjectNumber Chevron#9-3232 Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 13-Mar-01 07 46 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> lY Result Limit Uiuts Level Result %REC Limits RPD Luna Notes <br /> Batch 1B27013- EPA 5030B [PIT] <br /> Matrix Spike(1B27013-MS1) Source W102476-10 Prepared 27-Feb-0I Analyzed 28-Feb-01 <br /> Methyl Cert-butyl ether 440 20 ug/1 Soo ND 880 60-150 <br /> Surrogate Dibromofluorome[hane 493 500 986• So.]So <br /> Surrogate 1 2 Dtchloroethane-d4 416 500 832 50.150 <br /> Matrix Spike(IB27013-MS2) Source W102476-11 Prepared&Analyzed 28-Feb-01 <br /> Methyl tert-butyl ether 439 20 ug/1 500 ND 854 60-150 <br /> Surrogate Dibromofluoromethane 506 500 101 50-150 <br /> Surrogale 1 2-Dichloroethane-d4 438 500 876 50-150 <br /> Matrix Spike Dup(1B27013-MSD1) Source W102476-10 Prepared 27-Feb-01 Analyzed 28-Feb-01 <br /> Methyl telt butyl ether 505 20 ug/l 500 ND 101 60-150 138 25 <br /> Surrogate Dibromofluoromethane 511 500 102 50-150 <br /> Surrogate 1 2 DicNoroethane-d4 435 500 870 Sa-150 • <br /> Matrix Spike Dup(1B27013-MSD2) Source W102476-11 Prepared&Analyzed 28-Feb-01 <br /> Methyl tat-butyl ether 491 20 ug/l 500 ND 958 60-150 l 1 2 25 <br /> Surrogate Dibromofluoromelhane 501 Soo 100 50-150 <br /> Surrogate 1 2-Dichloroethane-d4 437 500 874 50-150 <br /> Sequoia Analytical -Walnut Creek The results in this report apply 10 the samples analyzed to accordance with the char <br /> custody document This analytical report must be reproduced in us entry <br /> Page 7 of 8 <br />