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885 Jams Drive <br /> Sequoia Morgan Hill CA 950375037 <br /> a— ) <br /> Analytical (408'776-9600 <br /> FAX(408)782-6308 <br /> www segaoialabs torr <br /> URS Corporation 111 Project ARCO 46020,Manteca,CA <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number ARCO#6020,Manteca,CA Reported <br /> Sacramento CA,95833 Project Manager Vete Elarth 10/24/02 11 03 <br /> Total Purgeable Hydrocarbons (C6-C10)by EPA 8015B modified,BTEX by EPA 8021B- Quality Control <br /> Sequoia Analytical-Morgan Hlll <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2308001-EPA 5030E[PIF] _ <br /> Blank(2J08001-BLK1) Prepared&Analyzed 10/08/02 _ <br /> Gasoline Range Organics(C6-CIO) ND 50 ugA <br /> Benzene ND 0 50 " <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 0 50 " <br /> Surrogate a a a-Trifluorotoluene 103 100 103 70-130 <br /> LCS(2J08001-BS1) Prepared 10/08/02 Analyzed 10/20/02 <br /> Gasoline Range Organics(C6-C10) ND 50 ugA 62-134 <br /> Benzene 930 050 100 93 0 70-130 <br /> Toluene 9 32 050 100 93 2 70-130 <br /> Ethylbenzene 896 0 50 100 896 70-130 <br /> Xylenes(total) 29 2 0 50 300 97 3 70-130 <br /> laurrogate a a a-Trifluorotoluene 8 94 100 89 4 70-130 <br /> LCS(2J08001-BS2) Prepared&Analyzed 10/08/02 <br /> Gasoline Range Organics(C&C10) 226 50 u9A 250 904 70-130 <br /> Benzene ND 050 68-140 <br /> Toluene ND 050 76-127 <br /> Ethylbenzene ND 050 77-130 <br /> Xylenes(total) ND 050 78-128 <br /> Surrogate aaa-Trifluorotoluene 9 61 100 962 70-130 <br /> Matrix Spike(2,108001-MSI) Source ML10799-01 Prepared&Analyzed 10/08/02 ._ <br /> Gasoline Range Organics(C6-C10) 442 50 ug/l 550 ND 80 4 60-140 <br /> Benzene 5 61 0 50 660 ND 85 0 60-140 <br /> Toluene 37 7 0 50 39 7 ND 95 0 60-140 <br /> Ethylbenzene 8 29 0 50 920 ND 88 9 60-140 <br /> Xylenes(total) 408 050 46 1 ND 88 5 60-140 <br /> Surrogate a a a-Trifluorotoluene 108 100 108 70-130 <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document This analytical report must be reproduced in its entirety <br /> 6 of 11 <br />