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Sequoia 1455 McDowell Blvd,North Ste D <br /> (DPetaluma,CA 94954 <br /> (707)792-1565 <br /> Analytical FAX(707)792-0342 <br /> www,sequoialabs.com <br /> URS Corp-Sacramento Project: Arco Site 5469,Stockton,CA P309139 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number, WR36605 Reported: <br /> Sacramento CA,95833 Project Manager: Jay Johnson 10/16/03 19:28 <br /> BTEX by 8021B -Quality Control <br /> Sequoia Analytical -Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3090325- EPA 5030,waters <br /> Blank(3090325-BLK1) Prepared&Analyzed: 09/16/03 <br /> Benzene ND 0.50 ugll <br /> Toluene ND 0.50 " <br /> Ethylbenzene ND 0.50 " <br /> Xylenes(total) 0.988 0.50 " <br /> Surrogate:a,a,a-Triuorotoluene 287 300 96 65-135 <br /> Laboratory Control Sample(3090325-BSI) Prepared&Analyzed: 09/16/03 <br /> Benzene 40.8 0.50 ug/1 34.0 120 65-135 <br /> Toluene 216 0.50 208 104 65-135 <br /> Ethylbenzene 44.1 0.50 47.0 94 65-135 <br /> Xylenes(total) 230 0.50 241 95 65-135 <br /> W <br /> rrogale:a,a,a-Trifluorotoluene 323 300 108 65-135 <br /> atrix Spike(3090325_MS1) Source: P309139-01 Prepared&Analyzed:09/16/03 <br /> Benzene 40.8 0.50 ug/I 34.0 ND 120 65-135 <br /> Toluene 225 0.50 208 ND 108 65-135 <br /> Ethylbenzene 46.3 0.50 47.0 ND 99 65-135 <br /> Xylenes(total) 242 0.50 241 0.55 100 65-135 <br /> Surrogate;a,a,a-Trifluorotoluene 315 300 108 65-135 <br /> Matrix Spike Dup(3090325-MSDI) Source:P309139-01 Prepared&Analyzed:09/16/03 <br /> Benzene 43.2 0.50 ugll 34.0 ND 127 65-135 6 20 <br /> Toluene 230 0.50 208 ND 111 65-135 2 20 <br /> Ethylbenzene 47.3 0.50 47.0 ND 101 65-135 2 20 <br /> Xylenes(total) 247 0.50 241 0.55 102 65-135 2 20 <br /> Surrogate:a,a,a-Trifluorotoluene 324 300 108 65-135 <br /> �equoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document.Unless otherwise stated,results are reported on a wet weight basis. <br /> This analytical report must be reproduced in its entirety. <br /> Page 24 of 38 <br />