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Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> Analytical (707)792-1865 <br /> FAX(707)792-0342 <br /> www.sequoialabs.com <br /> r <br /> S Corn-Sacramento Project: Arco Site 548,Stockton,CA P402257 <br /> 0 Gateway Oaks Drive Suite 300 Project Number: WR36608 Reported: <br /> ramento CA,95833 Project Manager: Vernon P.Elarth 02/26/04 17:54 <br /> Purgeable Hydrocarbons and BTEX by EPA 8015B/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 4020253-EPA 50308,waters <br /> Matrix Spike(4020253-MSI) Source:P402144-04 Prepared&Analyzed:02/11/04 <br /> Gasoline Range Organics 2530 50 mg/ml Air 2750 22 91 65-135 <br /> Gasoline Range Organics 718 14 ppmv 780 6.1 91 65-135 <br /> Benzene 39.7 0.50 mg/m'Air 40.0 0.18 99 65-135 <br /> Benzene 12.5 0.16 ppmv 12.5 0.057 100 65-135 <br /> Toluene 57.4 0.13 1. 49.3 0.054 116 65-135 <br /> Toluene 216 0.50 mg/ml Air 186 0.20 116 65-135 <br /> Ethylbenzene 49.7 0.50 43.5 ND 114 65-135 <br /> Ethylbenzene 11.5 0.12 ppmv 10.0 ND 115 65-135 <br /> Xylenes(total) 53.4 0.12 48.6 0.073 110 65-135 <br /> Xylenes(total) 231 0.50 mg/ml Air 210 0,32 110 65-135 <br /> Methyl Cert-butyl ether 21.4 0.56 ppmv 17.2 5.2 94 65-135 <br /> Methyl tert-butyl ether 77.1 2.0 mg/ml Air 62.0 19 94 65-135 <br /> arro0gate:a,a,a-Trifluorotoluene 51.9 ppmv 50.3 103 65-135 <br /> arrogate:a,a,a-Trifluorotoluene 310 mg/m'Air 300 103 63-135 <br /> Surrogate:4-Bromofluorobenzene 41.9 ppmv 41.9 100 65-135 <br /> Surrogate:4-Bromofluorobenzene 300 mg/m'Air 300 100 65-135 <br /> Matrix Spike Du 4020253-M_SDI) Source:P402144-04 Prepared&Analyzed:02/11/04 <br /> Gasoline Range Organics 717 14 ppmv 780 6.1 91 65-135 0.1 20 <br /> Gasoline Range Organics 2530 50 mgJm'Air 2750 22 91 65-135 0 20 <br /> Benzene 38.3 0.50 40.0 0.18 95 65-135 4 20 <br /> Benzene 12.0 0.16 ppmv 12.5 0.057 96 65-135 4 20 <br /> Toluene 210 0.50 mg/ml Air 186 0.20 113 65-135 3 20 <br /> Toluene 55.8 0.13 ppmv 49.3 0.054 113 65-135 3 20 <br /> Ethylbenzene 11.2 0.12 10.0 ND 112 65-135 3 20 <br /> Ethylbenzene 48.4 0.50 mg/ml Air 43.5 ND 111 65-135 3 20 <br /> Xylenes(total) 224 0.50 210 0.32 107 65-135 3 20 <br /> Xylenes(total) 51.7 0.12 ppmv 48.6 0.073 106 65-135 3 20 <br /> Methyl Cert-butyl ether 80.5 2.0 mg/m'Air 62.0 19 99 65-135 4 20 <br /> Methyl tert-butyl ether 22.4 0.56 ppmv 17.2 5.2 100 65-135 5 20 <br /> Surrogate.a,a,a-Trifluorotoluene 50.3 11 50.3 100 65-135 <br /> Surrogate:a,a,a-Trifluorotoluene 300 mg/m'Air 300 100 65-135 <br /> Surrogate:4-Bromofluorobenzene 41.8 ppmv 41.9 100 65-135 <br /> Surrogate:4-Bromofluorobenzene 299 mg/m'Air 300 100 65-135 <br /> Sequoia Analytical-Petaluma The results in this report apply to <br /> the samples analyzed in accordance with the chain <br /> of custody document. Unless otherwise stated,results are reported on a wet weight <br /> • basis. This analytical report must be reproduced in its entirety. <br /> Page 5 of 6 <br />