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1455 McDowell Bhd North Ste D <br /> 12) Sequoia Petaluma CA 94454 <br /> (707)792 1865 <br /> Analytical FAX(707)792 0342 <br /> www sequoialabs c� <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P310580 <br /> 3017 Kilgare Road Suite 100 Project Number 38984 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 11/06/03 l8 54 <br /> Purgeable Hydrocarbons and BTEX by EPA 8015B/8021B - Quality Control <br /> Sequoia Analytical- Petaluma <br /> Reporting Spike Source %REC RPI} <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3100757-EPA 5030,waters <br /> Matnx Spike(3100757-MS1) Source P310436-10 Prepared&Analyzed 10/30/03 <br /> Gasoline Range Organics 707 14 ppmv 780 29 90 65 135 <br /> Gasoline Range Organics 2490 50 mg/ml Air 2750 10 90 65-135 <br /> Benzene 13 2 0 16 ppmv 12 7 ND 104 65-135 <br /> Benzene 420 050 mg/m'Air 405 ND 104 65-135 <br /> Toluene 227 050 208 ND 109 65 135 <br /> Toluene 605 0 13 ppmv 55 4 ND 109 65 135 <br /> Ethylbenzene 469 050 mg/ml Air 450 ND 104 65-135 <br /> Ethylbenzene 108 0 12 ppmv 10 4 ND 104 65-135 <br /> Xylenes(total) 241 050 mg/ml Air 218 023 110 65-135 <br /> Xylenes(total) 557 0 12 ppmv 502 0 054 111 65-135 <br /> Methyl cert-butyl ether 783 2 0 mg/m'Air 630 037 124 65 135 <br /> Methyl cert-butyl ether 21 8 056 ppmv 175 010 124 65-135 <br /> Surrogate a a a-Trifluorotoluene 334 mglm'Air 300 111 65-135 <br /> Surrogate a a a-Trrfluorotoluene 539 ppmv J03 Ill 65-135 <br /> Surrogate 4-Bromofluorobenzene 401 419 96 65135 <br /> Surrogate 4-Bromofluorobenzene 288 mg/m'Air 300 96 65 135 <br /> Ma"Spike Du (3100757-MSDI) Source P310436-10 Prepared&Analyzed 10/30/03 <br /> Gasoline Range Organics 677 14 ppmv 780 29 86 65-135 4 20 <br /> Gasoline Range Organics 2390 50 mg/m'Air 2750 10 87 65-135 4 20 <br /> Benzene 128 0 16 ppmv 12 7 ND 101 65-135 3 20 <br /> Benzene 41 0 050 mg/m'Air 405 ND 101 65 135 2 20 <br /> Toluene 220 050 208 ND 106 65-135 3 20 <br /> Toluene 586 0 13 ppmv 55 4 ND 106 65-135 3 20 <br /> Ethylbenzene 10 8 0 12 104 ND 104 65-135 0 20 <br /> Ethylbenzene 467 0 50 mg/m'Air 45 0 ND 104 65-135 0 4 20 <br /> Xylcnes(total) 240 0 50 218 0 23 110 65-135 0 4 20 <br /> Xylenes(total) 554 0 12 ppmv 502 0 054 110 65-135 05 20 <br /> Methyl tert-butyl ether 21 5 056 " 175 0 10 122 65-135 1 20 <br /> Methyl tent-butyl ether 772 2 0 mg/ml Air 63 0 037 122 65 135 1 20 <br /> Surrogate a a a Triucrotoluene 53 5 ppmv 503 106 65-135 <br /> Surrogate a a a-Trrfluorotoluene 319 mg/m'Arr 300 106 65-135 <br /> Surrogate 4-Bromofluorobenzene 291 11300 97 65135 <br /> Surrogate 4-Bromofluorobenzene 407 ppmv 419 97 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 wee weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 12 of 19 <br />