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404 N Wiget Lane <br /> Sequoia Walnut Creek CA 94598 <br /> (925)98&%W <br /> AFAX quo25)9889673 <br /> Analytical <br /> www sequoialabs coni <br /> Gettler Ryan, Inc -Dublin Project Chevron <br /> 6747 Sierra Court Suite J Project Number Chevron 4 9-6258 Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 27-Jul-01 10 47 <br /> Total Purgeablc Hydrocarbons (C6-C12), BTEX and MTBE by DHS LUFT - Quality Control <br /> Scquola Analytical -Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1 G 12001 - EPA 50308 PIT <br /> LCS(IG12001-BS 7) Prepared&Analyzed 23-Jul-01 <br /> Benzene 21 5 050 ug/l 200 108 70-130 <br /> Toluene 201 0 50 200 100 70-130 <br /> Ethylbenzene 212 0 50 200 106 70-130 <br /> Xylenes(total) 59 I 0 50 600 985 70-130 <br /> Surrogate a a a-TriJluorotoluene 301 300 100 70-130 <br /> Matrix Spike(IG12001-MSI) Source W107223-04 Prepared 12-Jul-01 Analyzed 20-Jul-01 <br /> Benzene 223 050 ugA 200 ND 112 70-130 <br /> Toluene 219 0 50 200 ND 110 70-130 <br /> Ethylbenzene 225 0 50 200 ND 112 70-130 <br /> Xylenes(total) 62 1 0 50 600 ND 104 70-130 <br /> Surrogate a a a-Trifluorotoluene 307 300 102 70-130 <br /> Matrix Spike Dup(lG12001-MSDI) Source W107223-04 Prepared 12-Jul-Ol Analyzed 20-Jul-01 <br /> Benzene 217 0 50 ug/1 200 ND 108 70-130 2 73 20 <br /> Toluene 207 050 200 ND 104 70-130 5 63 20 <br /> Ethylbenzene 21 5 0 50 200 ND 108 70-130 455 20 <br /> Xylenes(total) 595 050 600 ND 992 70-130 428 20 <br /> Surrogate a a a-Trifluorotoluene 285 300 950 70-130 <br /> Sequoia Analytical- Walnut Creek The results in this report apply to the samples analyzed in accordance with the ch <br /> custody document This analytical report must be reproduced m its enu <br /> Page 9 of 12 <br />