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819 Striker Avenue Suste 8 <br /> Sequoia Sacramento CA 95834 <br /> 4D (916)921-9600 <br /> Analvtical FAX(916)921-0100 <br /> www sequoialabs com <br /> Oelta Environmental Consultants(Cameron Park) Project ARCO 2186,Stockton,CA <br /> 3330 Cameron Park Dr Ste 550 Project Number N/A Reported <br /> Cameron Park CA,95682 Project Manager Jay Johnson 10!08101 15 39 <br /> Total Purgeable Hydrocarbons 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 1090172-EPA 5030B PIT <br /> Blank(1090172-BLKI) _ _ „ Prepared&Analyzed 09/17/01 <br /> Purgeable Hydrocarbons ND 50 ugA <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 <br /> Xylenes(total) ND 050 " <br /> Surrogate a a a-Trifluorotoluene 105 100 105 60-140 <br /> LCS 1090172-BSI) Prepared&Analyzed 09/17/01 <br /> Benzene it 1 0 50 ug/l 100 111 70-130 <br /> Toluene 102 0 50 100 102 70-130 <br /> Ethylbenzene 9 93 0 50 100 99 3 70-130 <br /> Xylenes(total) 30 6 0 50 300 102 70-130 <br /> urrogate a a a-Tri luorotoluene 12 2 100 122 60-140 <br /> �IVlatnx Spike 1090172-MSl Source S109205-01 Prepared&Analyzed 09/17/01 <br /> Benzene 106 0 50 um 100 0 50 101 60-140 <br /> Toluene 9 89 0 50 100 ND 98 9 60-140 <br /> Ethylbenzene 942 0 50 100 ND 94 2 60-140 <br /> Xylenes(total) 286 0 50 300 ND 95 3 60-140 <br /> Surrogate a a a-Trifluorotoluene 10 1 100 101 60-140 <br /> Matrix Spike Dup(1090172-MSD1) Source 5109205-01 Prepared 09/17/01 Analyzed 09/18/01 <br /> Benzene 102 0 50 ugll 100 0 50 97 0 60-140 3 85 25 <br /> Toluene 943 0 50 100 ND 94 3 60-140 4 76 25 <br /> Ethylbenzene 9 t0 0 50 100 ND 91 0 60-140 3 46 25 <br /> Xylenes(total) 28 7 0 50 300 ND 95 7 60-140 0 349 25 <br /> Surrogate a a a-Trifluorotoluene 10 1 100 101 60-140 <br /> Sequoia Analytical-Sacramento 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 /> Page Page 8 of 13 <br />