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819 Striker Avenue,Suite 8 <br /> 41 IT). -01 0o <br /> Sequoia Sacramento,CA 95834 <br /> (916)921-9600 <br /> Analytical FAX(916)921 <br /> vrww.sequoialabs.coms.com <br /> FDoltanvironmental Consultants(Cameron Park) Project: ARCO 5469, Stockton,CA <br /> ameron Park Dr. ProjectNumber: NIA Reported:on Park CA,95682 Project Manager: Jay Johnson 04/04/01 17.07 <br /> Total Purgeable Hydrocarbons (C6-C12) and BTEX by DHS LUFT - 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 1030381 -EPA 5030B (P/T) <br /> Blank(1030381-BLKI) Prepared&Analyzed: 03/27/01 <br /> Purgeable Hydrocarbons ND 50.0 um <br /> Benzene ND 0.500 " <br /> Toluene ND 0.500 " <br /> Ethylbenzene ND 0.500 ^ <br /> Xylenes(total) ND 0.500 " <br /> Surrogate:a,a,a-Tryluorotoluene 8.22 11 10.0 82.2 60-140 <br /> LCS(1030381-BS1) Prepared&Analyzed:03/27/01 <br /> Benzene 8.94 0.500 ug/l 10.0 89.4 70-130 <br /> Toluene 8.93 0.500 " 10.0 89.3 70-130 <br /> Ethylbenzene 9.00 0.500 10.0 90.0 70-130 <br /> 'imbXylenes(total) 26.9 0..500 " 30.0 89.7 70-130 <br /> rrogate:a,a,a-Trinuorotoluene 810 11 10.0' 81.0 60-140 <br /> Matrix Spike(1030381-MS1) Source: 5103413-02 Prepared&Analyzed:03/27/01 <br /> Benzene 9.32 0.500 ug/l 10.0 0.630 86.9 60-140 <br /> Toluene 8.13 0.500 " 10.0 ND 81.3 60-140 <br /> Ethylbenzeme 9.02 0.500 10.0 ND 90.2 60-140 <br /> Xylenes(total) 27.0 0.500 " 30.0 ND 90.0 60-140 <br /> Surrogate:a,a,a-Triuorotoluene 8.95 1110.0 89.5 60-140 <br /> Matrix Spike Dup(1030381-MSDI) Source: 5103413-02 Prepared&Analyzed: 03/27/01 <br /> Benzene 9.85 0.500 u_q/l 10.0 0.630 92.2 60-140 5.53 25 <br /> Toluene 8.51 0.500 " 10.0 ND 85.1 60-140 4,57 25 <br /> Ethylbenzene 9.45 0.500 " 10.0 ND 94.5 60-140 4.66 25 <br /> Xylenes(total) 28.3 0.500 " 30.0 ND 94.3 60-140 4.70 25 <br /> Surrogate:ax a-Triuorotoluene 9.56 10.0 95.6 60-140 <br /> w <br /> quoia Analytical -Sacramento The results to this report apply to the samples analyzed in accordance with the chain of <br /> custody docuntent. This analytical report must be reproduced in its entirety. <br /> Pale 8 of 12 <br />