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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma CA 94954 <br /> 12) <br /> Analytical (707)792-1855 <br /> qW FAX(707)792-0342 <br /> www seyuoia]abs co <br /> � <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P401156 <br /> 3017 Krlgare Road Suite 100 Project Number 38984 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 01/27/04 15 26 <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 4010178-EPA 5030B,waters <br /> Matrix Spike(4010178-MS1) Source P401047-02 Prepared&Analyzed 01/13/04 _ <br /> Gasoline Range Organics 2400 50 mg/m3 Air 2750 ND 87 65-135 <br /> Gasoline Range Organics 680 14 ppmv 780 1 4 87 65-135 <br /> Benzene 38 9 050 mg/m'Air 405 ND 96 65-135 <br /> Benzene 12 2 0 16 ppmv 127 ND 96 65-135 <br /> Toluene 198 0 50 mg/ml Air 208 ND 95 65-135 <br /> Toluene 526 0 13 ppmv 554 ND 95 65-135 <br /> Ethylbenzene 105 0 12 " 10 4 ND 101 65-135 <br /> Ethylbenzene 45 3 050 mg/ml Air 450 ND 101 65-135 <br /> Xylenes(total) 216 050 11218 ND 99 65-135 <br /> Xylenes(total) 499 0 12 ppmv 502 0 034 99 65-135 <br /> Methyl tert-butyl ether 167 056 17 5 0 14 95 65-135 <br /> Methyl tert-butyl ether 60 3 2 0 mg/m3 Air 63 0 0 49 95 65 135 <br /> Surrogate a a a-Trifluoroioluene 301 300 100 65-135 <br /> Surrogate a a a-Trifluorotoluene 504 ppmv 503 100 65-135 <br /> Surrogate 4-Bromofluorobenzene 422 41 9 101 65-135 <br /> Surrogate 4-Bromofluorobenzene 302 mg/mI Air 300 101 65-135 <br /> Matrix Spike Dup(4010178-MSD1) Source P401047-02 Prepared&Analyzed 01/13/04 <br /> Gasoline Range Organics 2320 50 mg/ml Air 2750 ND 84 65-135 3 20 <br /> Gasoline Range Organics 658 14 ppmv 780 1 4 84 65-135 3 20 <br /> Benzene 11 8 0 16 " 12 7 ND 93 65-135 3 20 <br /> Benzene 377 0 50 mg/ml Air 40 5 ND 93 65-135 3 20 <br /> Toluene 190 050 208 ND 91 65-135 4 20 <br /> Toluene 506 0 13 ppmv 55 4 ND 91 65-135 4 20 <br /> Ethylbenzene 442 0 50 mg/m'Air 45 0 ND 98 65-135 2 20 <br /> Ethylbenzene 102 0 12 ppmv 104 ND 98 65-135 3 20 <br /> Xylenes(total) 211 0 SO mg/ml Air 218 ND 97 65-135 2 20 <br /> Xylenes(total) 488 0 12 ppmv 502 0 034 97 65-135 2 20 <br /> Methyl cert-butyl ether 600 2 0 mg/ml Air 63 0 049 94 65-135 0 5 20 <br /> Methyl cert-butyl ether 16 7 0 56 ppmv 175 014 95 65-135 0 20 <br /> Surrogate a a a-Trifluoroioluene 499 503 99 65-135 <br /> Surrogate a a a-Trifluorotoluene 298 mg/m'Air 300 99 65-135 <br /> Surrogate 4-Bromofluorobenzene 304 300 101 65-135 <br /> Surrogate 4-Bromofluorobenzene 425 ppmv 41 9 101 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 stated results are reported on a wet weight . <br /> basis This analytical report must be reproduced in its entirety <br /> Page 12 of 16 <br />