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Sequoia 1455 McDoue[I Blvd North Ste D <br /> Petaluma CA 94954 <br /> F�rr� (707)792-1865 <br /> Analytical <br /> FAX(707)792-0342 <br /> www sequoialabs cc <br /> � <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton, CA P312141 <br /> 3017 Kilgare Road Suite 100 Project Number [none] Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 12/22/03 14 28 <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 3120158-EPA 5030B,waters <br /> Matrix Sptk�3120158-MSI) Source P311494-03 _ Prepared&Analyzed 12/06/03 <br /> Gasoline Range Organics 830 14 ppmv 780 90 95 65-135 <br /> Gasoline Range Organics 2920 50 mg/ml Air 2750 320 95 65-135 <br /> Benzene 409 050 405 042 100 65-135 <br /> Benzene 12 8 0 16 ppmv 12 7 0 13 100 65-135 <br /> Toluene 211 050 mg/ml Air 208 094 101 65-135 <br /> Toluene 560 0 13 ppmv 55 4 0 25 101 65-135 <br /> Ethylbenzene 439 050 mg/ml Air 45 0 ND 98 65 135 <br /> Ethylbenzene 101 0 12 ppmv 104 ND 97 65-135 <br /> Xylenes(total) 237 050 mg/ml Air 218 0 51 108 65-135 <br /> Xylenes(total) 546 0 12 ppmv 50 2 0 12 109 65-135 <br /> Methyl tert-butyl ether 809 2 0 mg/m'Air 63 0 077 127 65-135 <br /> Methyl tert-butyl ether 22 5 056 ppmv 17 5 0 21 127 65-135 40 <br /> Surrogate a a a-Tris luorotoluene 524 503 104 65-135 <br /> Surrogate a a a-Trifluorotoluene 313 mg/m'rltr 300 104 65-135 <br /> Surrogate 4-Bromofluorobenzene 423 ppmv 41 9 101 65-135 <br /> Surrogate 4-Bromofluorobenzene 302 mg/m'Air 300 101 65-135 <br /> Matrix Spike Du 3120158-MSD1 Source P311494-03 Prepared&Analyzed 12/06/03 <br /> Gasoline Range Organics 2860 50 mg/ml Air 2750 320 92 65-135 2 20 <br /> Gasoline Range Organics 813 14 ppmv 780 90 93 65-135 2 20 <br /> Benzene 400 050 mg/m'Air 405 0 42 98 65-135 2 20 <br /> Benzene 12 5 0 16 ppmv 127 0 13 97 65-135 2 20 <br /> Toluene 563 0 13 55 4 0 25 101 65-135 0 5 20 <br /> Toluene 212 050 mg/ml Air 208 094 101 65-135 0 5 20 <br /> Ethylbenzene 100 0 12 ppmv 10 4 ND 96 65-135 1 20 <br /> Ethylbenzene 434 050 mg/ml Air 45 0 ND 96 65-135 1 20 <br /> Xylenes(total) 54 1 0 12 ppmv 50 2 0 12 108 65-135 0 9 20 <br /> Xylenes(total) 235 050 mg/ml Air 218 0 51 108 65-135 0 8 20 <br /> Methyl tert-butyl ether 18 9 056 ppmv 17 5 021 107 65-135 17 20 <br /> Methyl tert-butyl ether 68 1 2 0 mg/ml Air 63 0 077 107 65-135 17 20 <br /> Surrogate a a a-Trti luorotoluene 320 11 300 107 65-135 <br /> Surrogate a a a-Trifluorotoluene 535 ppmv 503 106 65-135 <br /> Surrogate 4-Bromofluorobenzene 306 mg/m'Rir 300 102 65-135 <br /> Surrogate 4-Bromofluorobenzene 428 ppmv 41 9 102 65-135 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise slated results are reported on a wet weight <br /> basis This analytical report must be reproduced to its entirety <br /> Page 12 of 16 <br />