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819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento, 95934 <br /> (915))9 921-9600 <br /> Analytical FAX(916)921-0100 <br /> wwwsequoialabs.com <br /> Delta Environmental Consultants(Cameron Park) Project: ARCO 5469,Stockton,CA <br /> 3330 Cameron Park Dr.Ste 550 Project Number: N/A Reported: <br /> Cameron Park CA,95682 Project Manager: Jay Johnson 07/16/01 15:54 <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 1070118-EPA 5030B(P <br /> Blank 1070118-BLKI Prepared&Analyzed:07/12/01 <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-Trifluorotoluene 11.0 10.0 110 60-140 <br /> LCS(1070118-BSI) Prepared_&_Analyzed:07/12/01 <br /> Benzene 9.05 0.50 ug/l 10.0 90.5 70-130 <br /> Toluene 10.1 0.50 10.0 101 70-130 <br /> Ethylbenzene 10.5 0.50 10.0 105 70-130 <br /> Xylenes(total) 29.7 0.50 30.0 99.0 70-130 <br /> Ourrogate;a,a,a-Trifluorotoluene 12.1 10.0 121 60-140 <br /> latrix Spike 1070118-MS1Source:5107019-02 Prepared&Anal ccdJ 07/12/01 <br /> Benzene 9.82 0.50 119/1 10.0 0.73 90.9 60-140 <br /> Toluene 9.50 0.50 10.0 0.62 88.8 60-140 <br /> Ethylbenzene 9.20 0.50 10.0 ND 92.0 60-140 <br /> Xylenes(total) 25.6 0.50 30.0 0.67 83.1 60-140 <br /> Surrogate:a,a,a-Trifluoro toluene 12.0 10.0 120 60-140 <br /> Matrix Spike Dup(1070118-MSD1)_ Source:5107019-02 Prepared&Analyzed:07/12/01 _ <br /> Benzene 10.7 0.50 ug/l 10.0 0.73 99.7 60-140 ' 8.58 25' <br /> Toluene 10.7 0.50 10.0 0.62 101 60-140 11.9 25 <br /> Ethylbenzene 10.4 0,50 10.0 ND 104 60-140 12.2 25 <br /> Xylenes(total) 30.0 0.50 30.0 0.67 97.8 60-140 15.8 25 <br /> Surrogate:a,a,a-Trifluorotoluene 12.4 10.0 124 60-140 <br /> equoia 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 5 of 7 <br />