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Sequoia 1455 McDowell Blvd North Ste D <br /> a— ) <br /> Petaluma CA 94954 <br /> (707)792-1865 <br /> iAnalytical FAX(707)792-0342 <br /> IDwww sequotalabs corn <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P401156 <br /> 30171G1 are Road Suite 100 <br /> $ 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 8015B18021B- Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %aREC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4010178-EPA 5030B,waters <br /> Blank 401017&BLKI Pre ared&Analyzed 01/13/04 <br /> Gasoline Range Organics ND 50 mg/ml Air <br /> Gasoline Range Organics ND 14 ppmv <br /> Benzene ND 0 50 mg/ml Air <br /> Benzene ND 016 ppmv <br /> Toluene ND 0 50 mg/ml Air <br /> Toluene ND 013 ppmv <br /> Ethylbenzene ND 0 50 mg/ml Air <br /> Ethylbenzene ND 012 ppmv <br /> Xylenes(total) ND 0 50 mg/ml Air <br /> Xylenes(total) ND 0 12 ppmv <br /> Methyl cert-butyl ether ND 2 0 mg/m'Air <br /> Methyl cert butyl ether ND 0 56 ppmv <br /> Surrogate a a a Trifluorotoluene 479 503 95 65-135 <br /> Surrogate a a a Trifluorotoluene 186 mglm'Rir 300 95 65-135 <br /> Surrogate 4-3romofluorobenzene 185 11 300 95 65-135 <br /> Surrogate 4-Bromofluorobenzene 398 ppmv 41 9 95 65-135 <br /> Laboratory Control Sample(4010.1.78-BSI) Prepared&Analyzed 01/13/04 - <br /> Gasoline Range Organics 685 14 ppmv 780 88 65-135 <br /> Gasoline Range Organics 2410 50 mg/ml Air 2750 88 65-135 <br /> Benzene 404 050 11 405 100 65-135 <br /> Benzene 127 0 16 ppmv 12 7 100 65-135 <br /> Toluene 211 050 mg/m'Air 208 101 65-135 <br /> Toluene 562 0 13 ppmv 554 101 65-135 <br /> Ethylbenzene 108 0 12 11104 104 65-135 <br /> Ethylbenzene 467 0 50 mg/ml Air 45 0 104 65-135 <br /> Xylenes(total) 51 5 0 12 ppmv 502 103 65-135 <br /> Xylenes(total) 223 0 50 mg/ml Air 218 102 65-135 <br /> Methyl tert-butyl ether 17 7 0 56 ppmv 175 101 65-135 <br /> Methyl tert-butyl ether 63 5 2 0 mg/m'Air 630 101 65 135 <br /> Surrogate a a a-Trifluorotoluene 520 ppmv 503 103 65-135 <br /> Surrogate a a a-Tris luorotoluene 310 mg1ni'Air 300 103 65-135 <br /> Surrogate 4-Bromofluorobenzene 303 " 300 101 65-135 <br /> Surrogate 4 Bromofluorobenzene 42 3 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 cusiody document Unless otherwise staled results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 11 of 16 <br />