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404 N Wiget Lane <br /> Sequoia Walnut CreekCA <br /> 94598 <br /> (925)9$8-9600-96W <br /> 4 <br /> FAX(925)988-9673 <br />;GiettlerRyan, <br /> Analyticalwwwsequoialabs com <br /> Inc -Dublin Project Chevron <br /> 6747 Sierra Court Suite I Project Number Chevron#9-2033 Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 04-Sep-01 11 14 <br /> Total Purgeable Hydrocarbons (C6-C12), BTEX and MTBE by DHS LUFT - Quality Control <br /> Sequoia Analytical - Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1 H24002-EPA 5030B P/T <br /> LCS(IH24002-BS2) Prepared&Analyzed 27-Aug-01 <br /> Benzene 183 050 ugA 200 915 70-130 <br /> Toluene 191 050 200 955 70-130 <br /> Ethylbenzene 19 7 050 200 985 70-130 <br /> Xylenes(total) 591 0 50 600 985 70-130 <br /> 8u11ogale a a a-Tri luorotoluene 292 300 973 70-130 <br /> LCS(IH24002-BS3) Prepared&Analyzed 28-Aug-01 <br /> Benzene 17 9 050 ug/l 200 895 70-130 <br /> Toluene 188 050 200 940 70-130 <br /> Ethylbenzene 19 6 0 50 " 200 980 70-130 <br /> Xylenes(total) 586 050 600 977 70-130 <br /> 0arogate a a a-Tr�uorotoluene 293 300 977 70-130 <br /> trix Spike(1H24002-MSI) Source W108316-03 Prepared&Analyzed 24-Aug-01 <br /> Benzene 173 0 50 ug/l 200 ND 865 70-130 <br /> Toluene 184 050 200 ND 920 70-130 <br /> Ethylbenzene 189 050 200 ND 945 70-130 <br /> Xylenes(total) 563 050 600 ND 938 70-130 <br /> Surrogate a,a a-Trifluorotoluene 295 300 983 70-130 <br /> Matrix Spike Dup(IH24002-MSDI) Source W108316-03 Prepared&Analyzed 24-Aug-01 <br /> Benzene 193 050 ugn 200 ND 965 70-130 109 20 <br /> Toluene 203 050 200 ND 102 70-130 982 20 <br /> Ethylbenzene 210 050 200 ND 105 70-130 10 5 20 <br /> Xylenes(total) 619 050 " 600 ND 103 70-130 948 20 <br /> Surrogate aa a-TriJluorotoluene 295 300 983 70-130 <br />�yuola Analytical-Walnut Creek The results in this 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 12 of 26 <br />