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819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> (916)921-9600 <br /> Analytical FAX(916)921-0100 <br /> www.sequoialabs.com <br /> atus Environtnental Project: ARCO 548,Stockton,CA <br /> 3330 Cameron Park Drive,Ste. 550 Project Number. 548,Stockton,CA Reported: <br /> Cameron Park CA,95682 Project Manager: Jay Johnson 06/24/02 16:34 <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 2060241 -EPA 5030B PIT) <br /> Blank(2060241-BLKI) Prepared&Analyzed: 06/19/02 <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 0.50 " <br /> Surrogate:a,a,a-Triuorotoluene 9.99 10.0 100 60-140 <br /> LCS(2060241-BSI) Prepared&Analyzed. 06/19/02 <br /> Benzene 9.84 0.50 ug/l 10.0 98 70-130 <br /> Toluene 10.4 0.50 10.0 104 70-130 <br /> Ethylbenzene 10.3 0.50 10.0 103 70-130 <br /> Xylenes(total) 31.8 0.50 30.0 106 70-130 <br /> �rogate:a,a,a-Trifluorotaluene 10.3 10.0 I03 60-140 <br /> atrix Spike(2060241-MS1) Source:S2D6184-D7 Prepared&Analyzed: 06/19/02 <br /> Benzene 9.50 0.50 ug/1 10.0 ND 95 60-14D <br /> Toluene 9.88 0.50 10.0 ND 99 60-140 <br /> Ethylbenzene 9.83 0.50 10.0 ND 98 60-140 <br /> Xylenes(total) 29.5 0.50 30.0 ND 98 60-140 <br /> Surrogate:a,a,a-Trifluorotoluene 9.71 10.0 97 60-140 <br /> Matrix Spike Dup(2060241-MSD1) Source:5206184-07 Prepared&Analyzed: 06/19/02 <br /> Benzene 9.86 0.50 ug/l 10.0 ND 99 60-140 4 25 <br /> Toluene 10.4 0.50 10.0 ND 104 60-140 5 25 <br /> Ethylbenzene 10.3 0.50 10.0 ND 103 60-140 5 25 <br /> Xylenes(total) 31.7 0.50 " 30.0 ND 106 60-140 7 25 <br /> Surrogate:a,a,a-Trifluorotoluene 9.65 10.0 96 60-140 <br /> oia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document. This analytical report must be reproduced in.its entirety, <br /> Page Page 9 of 13 <br />