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819 Stnker Avenue Suite 8 <br /> SequoiaU Saamento CA 5834 <br /> (916)92199600 <br /> FAX(916)921-0100 <br /> Analytical www sequoWabs corn <br /> M <br /> Gettler-Ryan-Dublin Project Chevron 9-6258,Stockton,CA Sampled 4124100 <br /> 6747 Sierra Court,Ste J Project Number 386844 Received 4/26100 <br /> Dublin,CA 94568 Project Manager Deanna L Harding Reported 5110100 <br /> Total Purgeable Hydrocarbons(C6-C12),BTEX and MTBE by DHS LUFT/Quality Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov Limits % Limit % Nates* <br /> Blank(con_tmued 0050071-BLK1 <br /> Surrogate a,a,a-Tr fluorotoluene 5/4/00 100 861 u9/1 600-140 861 <br /> —CS 0050071-BSI <br /> Benzene 5/4100 10 0 9 55 ug/l 700-130 95 5 <br /> Toluene 10 0 962 700-130 962 <br /> Ethylbenzene 10 0 957 700-130 957 <br /> Xylenes(total) 300 28 6 700-130 95 3 <br /> Methyl tert-butyl ether l0 0 942 700-130 942 <br /> Surrogate a,ga-Trifluorotoluene 10 0 888 600-140 888 <br /> Matrix Spike 0050071-MSI 5004347-02 <br /> Benzene 5/4/00 10 0 ND 9 78 ug/l 60 0-140 97 8 <br /> Toluene „ 10 0 ND 983 600-140 983 <br /> abcnzene 10 0 ND 988 600-140 988 <br /> es(total) 300 ND 294 600-140 980 <br /> Methyl tert-butyl ether 10 0 ND 10 6 600-140 106 _ <br /> Surrogate a,a,a-Trifluorotoluene 100 840 600-140 840 <br /> Matrix Spike Duo 0050071-MSD1 5004347-02 <br /> 9 56 ug/l 60 0-140 45 6 25 0 2 2$ <br /> Benzene 5/4/00 100 ND <br /> Toluene 100 ND 961 600-140 961 250 2.26 <br /> Ethylbenzene 10 0 ND 966 600-140 966 25 0 225 <br /> Xylenes(total) 300 ND 285 60 0-140 950 250 3 11 <br /> Methyl tert-butyl ether 100 ND 793 600-140 793 25 0 288 2 <br /> Surrogate a,a a-Tr!fluorotoluene 100 866 600-140 866 <br /> • <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions <br /> , Page 6 of 9 <br /> p <br /> `may' <br />