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404 N Wiget Lane <br /> Walnut Creek CA 94598 <br /> Sequoia (925)988-96M <br /> 4 FAX(925)988-9673 <br /> Analytical www sequolalabs corn <br /> AWIk <br /> ttler Ryan,Inc -Dublin Project Chevron <br /> 6747 Sierra Court Suite J Project Number Chevron# 9-2033 Reported <br /> Dublin CA,94568 Project Manager Deannal, Harding 12-Mar-01 07 45 <br /> Volatile Organic Compounds by EPA Method 8010B - Quality Control <br /> Sequoia Analytical - Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Lunn Umts Level Result %REC Limits RPD Lurut Notes <br /> Batch 1B22003- EPA 5030B [P/TJ <br /> LCS(IB22003-BS2) Prepared&Analyzed 23-Feb-01 <br /> l,l-Dic.hloroethene 176 10 ugh 200 880 65-135 <br /> Tnchloroethene 161 20 200 805 70-130 <br /> Chlorobenzene 159 l 0 200 795 70-130 <br /> Surrogate Drbromodi luoromethane 116 100 116 50-150 <br /> Surrogate 4-Bromofluoroberrzene 104 100 104 50-150 <br /> LCS(IB22003-BS3) Prepared&Analyzed 26-Feb-01 <br /> 1,1-Dichloroethene 18 1 10 ug/I 200 905 65-135 <br /> Tnchloroethena 161 20 200 805 70-130 <br /> Chlorobenzene 159 10 200 795 70-130 <br /> Surrogate Drbrromodifluoromethane 890 100 890 50-150 <br /> Surrogate 4-Bromofluorobenzene 100 100 100 50-150 <br /> trix Spike(1B22003-MS1) Source W102365-05 Prepared&Analyzed 22-Feb-01 <br /> -Dichloroethene 199 10 ugll 200 ND 995 60-140 <br /> Trichloroethene 179 20 200 ND 895 60-140 <br /> Chlorobenzene 191 10 200 ND 905 60-140 <br /> Surrogate Dibromodiuoromethane 126 100 126 50-150 <br /> Surrogate 4-Bromofluorobemene 101 100 101 50-150 <br /> Matrix Spike Dup(IB22003-MSD1) Source W102365-05 Prepared&Analyzed 22-Feb-01 <br /> 1,1-Dichloroethene t82 10 ug/1 200 ND 910 60-140 992 25 <br /> Tnehloroethene 166 20 200 ND 830 60440 754 25 <br /> Chlorobenzene 164 10 200 ND 820 60-140 986 25 <br /> Surrogate Dibromodifluoromethane 118 100 118 50-150 <br /> Surrogate 4-Bronrofluorobenzene 947 100 947 50-150 <br /> Sequoia Analytical-Walnut Creek The results in flus report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 14 of 25 <br />