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1455 McDowell Blvd North Ste D <br /> Sequoia <br /> Petaluma.CA 94954 <br /> ID (707)792-1865 <br /> Analytical FAXsequoi792-0342 <br /> • www.sequo�alabs.com <br /> URS Corp-Sacramento Project: Arco Site 548,Stockton,CA P305579 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36608 Reported: <br /> Sacramento CA,95833 Project Manager: Vernon P.Elarth 06/13/03 09:21 <br /> Total Petroleum Hydrocarbons as Gasoline 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 3050763-EPA 5030,waters <br /> Matrix Spike(3050763-MSI) Source:P305431-10 Prepared&Analyzed:05/30/03 <br /> Gasoline Range Organics 2150 50 mg/m'Air 2750 ND 78 65-135 <br /> Gasoline Range Organics 609 14 ppmv 780 ND 78 65-135 <br /> Benzene 11.5 0.16 12.5 ND 92 65-135 <br /> Benzene 36.6 0.50 mg/m'Air 40.0 ND 92 65-135 <br /> Toluene 53.8 0.13 ppmv 49.3 ND 109 65-135 <br /> Toluene 202 0.50 mg/ml Air 186 ND 109 65-135 <br /> Ethylbenzene 10.2 0.12 ppmv 10.8 ND 94 65-135 <br /> Ethylbetizene 44.1 0.50 mg/m'Air 47.0 ND 94 65-135 <br /> Xylenes(total) 50.8 0.12 ppmv 48.6 ND 105 65-135 <br /> Xylenes(total) 220 0.50 mg/ml Air 210 ND 105 65-135 <br /> Methyl tert-butyl ether 21.7 0.56 ppmv 17.2 ND 126 65-135 <br /> Methyl tert-butyl ether 78.2 2.0 mg/ml Air 62.0 0.54 125 65-135 <br /> i Surrogate:a,a,a-Tris luorwoluene 53.7 ppmv 50.3 107 65-135 <br /> Surrogate:a,a,a-Trifluororoluene 321 mglm'Air 300 107 65-135 <br /> Surrogate:4-Bromofluorobenzene 293 11300 98 65-135 <br /> Surrogate:4-Bromofluorobenzene 41.0 ppmv 41.9 98 65-135 <br /> Matrix Spike Dup(3050763-MSDI) Source:P305431-10 Prepared&Analyzed:05/30/03 <br /> Gasoline Range Organics 617 14 ppmv 780 ND 79 65-135 1 20 <br /> Gasoline Range Organics 2170 50 mg/m'Air 2750 ND 79 65-135 0.9 20 <br /> Benzene 12.0 0.16 ppmv 12.5 ND 96 65-135 4 20 <br /> Benzene 38.1 0.50 mg/m'Air 40.0 ND 95 65-135 4 20 <br /> Toluene 57.2 0.13 ppmv 49.3 ND 116 65-135 6 20 <br /> Toluene 215 0.50 mg/m'Air 186 ND 116 65-135 6 20 <br /> Ethylbenzene 10.4 0.12 ppmv 10.8 ND 96 65-135 2 20 <br /> Ethylbenzene 45.1 0.50 mg/ml Air 47.0 ND 96 65-135 2 20 <br /> Xylenes(total) 232 0.50 210 ND Ho 0 65-135 5 20 <br /> Xylenes(total) 53.6 0.12 ppmv 48.6 ND 110 65-135 5 20 <br /> Methyl tert-butyl ether 20.9 0.56 17.2 ND 122 65-135 4 20 <br /> Methyl tert-butyl ether 75.0 2.0 mglm'Air 62.0 0.54 120 65-135 4 20 <br /> Surrogate:a,a a-Trifluorololuene 56.1 ppmv 50.3 111 65-135 <br /> Surrogate:a,a,a-Trifluorololuene 335 mglm'Air 300 112 65-135 <br /> Surrogate:4-Bromofluorobenzene 41.4 ppmv 41.9 99 65-135 <br /> Surrogate,4-Bromofluorobenzene 296 mg/m'Air 300 99 65-135 <br /> • Sequoia 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 6 of 7 <br />