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1455 McDowell Blvd,North Ste D <br /> Petal(7ma,07 94954 <br /> Sequoia <br /> (707)79 2-I665 <br /> Analytical Pw.s(qu)792-0342 <br /> . www.sequoialabscom <br /> URS Corp-Sacramento Project: Arco Site 548,Stockton,CA P310024 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36608 Reported: <br /> Sacramento CA,95833 Project Manager: Vernon P.Elarth 10/13/03 17:17 <br /> Total Petroleum Hydrocarbons as Gasoline and BTEX by EPA 8015B/8021B-Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source /.RFC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3090664-EPA 5030,waters <br /> Matrix Spike(3090664-MSI) Source:P309415-02 Prepared&Analyzed:09/30/03 <br /> Gasoline Range Organics 2380 50 mgl&Air 2750 28 86 65-135 <br /> Gasoline Range Organics 675 14 ppmv 780 7.8 86 65-135 <br /> Benzene 39.2 0.50 mg/m'Au 34.0 ND 115 65-135 <br /> Bane 12.3 0.16 ppmv 10.7 ND 115 65-135 <br /> Toluene 55.7 0.13 11 55.4 0.13 100 65-135 <br /> Toluene 210 0.50 mg/ml Air 208 0.50 101 65-135 <br /> Ethylbenzene 43.3 0.50 47.0 ND 92 65-135 <br /> Ethylbenzene 10.0 0.12 ppmv 10.8 ND 93 65-135 <br /> Xylenes(total) 52.2 0.12 55.6 ND 94 65-135 <br /> Xylenes(total) 226 0.50 mg/m'Air 241 ND 94 65-135 <br /> Methyl Cert-butyl ether 15.6 0.56 ppmv 15.6 ND 100 65-135 <br /> Alkethyl tert-butyl ether 56.1 2.0 mg/ml Air 56.0 ND 100 65-135 <br /> urrogate:a,a,a-Tris luorotaluene 55.0 ppmv 50.3 109 65-135 <br /> Surrogate_a,a,a-Trifluorotoluene 328 mg/mIAir 300 109 65-135 <br /> Surrogate:4-Bromofluorobenzene 40.9 ppmv 41.9 98 65-135 <br /> Surrogate:4-Bromofluorobenzene 293 mg/m'Air 300 98 65-135 <br /> Matrix Spike Dup(3090664-MSD1) Source:P309415-02 Prepared&Analyzed:09/30/03 <br /> Gasoline Range Organics 641 14 ppmv 780 7.8 81 65-135 5 20 <br /> Gasoline Range Organics 2260 50 mg/m'Air 2750 28 81 65-135 5 20 <br /> Benzene 38.2 0.50 n34.0 ND 112 65-135 3 20 <br /> Benzene 12.0 0.16 ppmv 10.7 ND 112 65-135 2 20 <br /> Toluene 206 0.50 mg/ml Air 208 0-50 99 65-135 2 20 <br /> Toluene 54.8 0.13 ppmv 55.4 0.13 99 65-135 2 20 <br /> Ethylbenzene 9.82 0.12 10.8 ND 91 65-135 2 20 <br /> Ethylbenzene 42.5 0.50 mglm'Air 47.0 ND 90 65-135 2 20 <br /> Xylenes(total) 222 0.50 241 ND 92 65-135 2 20 <br /> Xylenes(total) 51.3 0.12 ppmv 55.6 ND 92 65-135 2 20 <br /> Methyl tert-butyl ether 57.8 2.0 mg/m'Air 56.0 ND I03 65-135 3 20 <br /> Methyl tert-butyl ether 16.1 0.56 ppmv 15.6 ND 103 65-135 3 20 <br /> ;Surrogate:a,a,a-Trifluorotoluene 55.2 1150.3 110 65-135 <br /> Surrogate:a,a,a Tri,luorotoluene 329 mg/m'Air 300 110 65-135 <br /> Surrogate:4-Bromofluorobenzene 41.6 ppmv 41.9 99 65-135 <br /> ! Surrogate:4-Bromofluorobenzene 297 mg/m'Air 300 99 65-135 <br /> quoia 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 he reproduced in its entirety. <br /> Page 6 of 7 <br />