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1455 McDowell Blvd North Ste D <br /> Z— Sequoia Petaluma,CA 94954 <br /> (707)792 1865 <br /> Analytical FAX(707)7920342 <br /> www sequoialabs com <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P405538 <br /> 3017 Kilgare Road Suite 100 Project Number WR 63964 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 06/14/04 17 02 <br /> Purgeable Hydrocarbons by EPA 8015B- Quality Control <br /> Sequoia Analytical- Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Unita Level Result %REC Limits RPD Limit Notes <br /> Batch 4050700-EPA 5030B waters <br /> Blank(4050700-BLKI) Prepared&Analyzed 05/28/04 <br /> Gasoline Range Organics(C4-C 12) ND 14 ppmv <br /> Gasoline Range Organics(C4-C 12) ND 50 mg/ml Air <br /> Surrogate 4-Bromofluorobenzene 434 ppmv 419 108 65-135 <br /> Surrogate 4-Bromofluorobenzene 315 mg/mIAtr 300 108 65-135 <br /> Laboratory Control Sample(4050700-BSI) Prepared&Analyzed 05/28/04 <br /> Gasoline Range Organics(C4-C 12) 2330 50 mg/ml Air 2750 85 65 135 <br /> Gasoline Range Organics(C4-C 12) 661 14 ppmv 780 85 65-135 <br /> Surrogate 4-Bromofluorobenzene 459 11419 110 65-135 <br /> Surrogate 4-Bromofluorobenzene 319 mg/m'Atr 300 110 65-135 <br /> Matrix Spike(4050700-MSI) Source P405437-09 Prepared&Analyzed 05/28/04 <br /> Gasoline Range Organics(C4-C12) 2180 50 mg/m'Air 2750 ND 79 65-135 <br /> Gasoline Range Organics(C4-C 12) 619 14 ppmv 780 ND 79 65-135 <br /> Surrogate 4-Bromofluorobenzene 439 419 105 65-135 <br /> Surrogate 4-Bromofluorobenzene 314 mg/m'Atr 300 105 65135 <br /> Matrix Spike Dup(4050700-MSD1) Source P405437-09 Prepared&Analyzed 05/28/04 <br /> Gasoline Range Organics(C4-C 12) 624 14 ppmv 780 ND 80 65 135 08 20 <br /> Gasoline Range Organics(C4-C 12) 2200 50 mg/ml Air 2750 ND 80 65-135 09 20 <br /> Surrogate 4-Bromofluorobenzene 446 ppmv 419 106 65-135 <br /> Surrogate 4-Bromofluorobenzene 319 mghn'Air 300 106 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 otherwue stated,results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 5 of 8 <br />