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819 Sinker Avenue,Suite 8 <br /> Sequoia Sacramento CA 95834 <br /> . (916)921-9600 <br /> — Analytical FAX(916)921-0100 <br /> INkwww sequoialabs corn <br /> elta Environmental Consultants(Cameron Park) Project ARCO 2168,Stockton,CA <br /> 0 Cameron Park Dr Ste 550 Project Number 2168,Stockton,CA Reported <br /> amcron Park CA,95682 Project Manager Steve Carter 04/17/02 09 40 <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 2030007-EPA 5030B(P/T) <br /> LCS 2030007-BSI Pre aced&Analyzed 02/27/02 <br /> Benzene 8 79 050 ug/I 10 0 87 9 70-130 <br /> Toluene 8 14 0 50 10 0 81 4 70-130 <br /> Ethylbenzene 8 51 0 50 too 85 1 70-130 <br /> Xylenes(total) 244 0 50 30 0 81 3 70-130 <br /> Surrogate a a a-Trifluoro toluene 860 100 860 60-140 <br /> Batch 2030022-EPA 5030B(P/T) <br /> Blank 2030022-BLK1Prepared&Analyzed 03/01/02 <br /> Purgeable Hydrocarbons ND 50 ug/1 <br /> Benzene ND 0 50 " <br /> Toluene ND 0 50 " <br /> Ethylbenzene ND 0 50 " <br /> Xylenes(total) ND 0 50 " <br /> 09 <br /> a a a-Trifluorotoluene 966 100 966 60-140 <br /> LCS(2030022-BSI) Prepared&Analyzed 03/01/02 _ <br /> Benzene 9 95 0 50 ugll 100 99 5 70-130 <br /> Toluene 940 0 50 100 940 70-130 <br /> Ethylbenzene 9 60 0 50 100 960 70-130 <br /> Xylenes(total) 27 6 0 50 30 0 92 0 70-130 <br /> Surrogate a a a-Trrfluorotoluene 9 71 100 971 60-140 <br /> LCS Dup(2030022-BSD1) Prepared&Analyzed 03/01/02 <br /> Benzene 9 04 0 50 ug/l 100 904 70-130 9 58 25 <br /> Toluene 9 05 0 50 10 0 905 70-130 3 79 25 <br /> Ethylbenzene 9 35 0 50 10 0 93 5 70-130 2 64 25 <br /> Xylenes(total) 26 8 0 50 30 0 89 3 70-130 2 94 25 <br /> Surrogate a a a-Trifluoro toluene 103 100 103 60-140 <br /> oia 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 11 of 15 <br />