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819 Straker Avenue,Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> ,S� (916)921-9600 <br /> Analytical FAX(916)921-0100 <br /> www sequoialabs cam <br /> . URS-Sac Gateway Oaks Project ARCO 2093,Tracy,CA <br /> 2870 Gateway Oaks Dr, Ste 300 Project Number 2093,Tracy,CA Reported <br /> Sacramento CA,95833 Protect Manager Vernon Elarth 07/16/02 17 03 <br /> Total Purgeable Hydrocarbons and BTEX by DHS LUFr-Quality Control <br /> Sequoia Analytical- Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2070120-EPA 5030B(PfT) <br /> Blank 2070120-BLKI Prepared&Analyzed 07/11/02 <br /> Purgeable Hydrocarbons ND 50 ug/l <br /> Benzene ND 0 50 " <br /> Toluene ND 0 50 " <br /> Ethylbenzene ND 0 50 " <br /> Xylenes(total) ND 050 " <br /> Surrogate a a a-Trifluorotoluene 948 " 100 95 60-140 <br /> LCS(2070120-BS1) Prepared&Analyzed 07/11/02 <br /> Benzene 986 050 ug/1 10 0 99 70-130 <br /> Toluene 102 0 50 10 0 102 70-130 <br /> Ethylbenzene 105 0 50 10 0 105 70-130 <br /> Xylenes(total) 302 050 30 0 101 70-130 <br /> Surrogate a a a-Trifluorotoluene IU 0 10 0 100 60-140 <br /> CS Du 2070120-BSDI Pre ared&Anal zed 07/11/02 <br /> Benzene 9 51 0 50 ug/l 100 <br /> 95 70-130 4 25 <br /> Toluene 996 0 50 100 100 70-130 2 25 <br /> Ethylbenzene 102 0 50 " 10 0 102 70-130 3 25 <br /> Xylenes(total) 29 6 0 50 11 30 0 99 70-130 2 25 <br /> Surrogate a a a-Tris luorotoluene 9 81 11 100 98 60-140 <br /> Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain <br /> ofcustody document This analytical report must be reproduced in its entirety <br /> Page Page 8 of 11 <br />