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SequoiaM 885]avis Dr <br /> organ Hi11,CA 95037 <br /> .'"61AAnalytical (408'776-9600 <br /> • FAX(408)782308 <br /> www.sequoialabs.con <br /> URS Corporation i1) Project: ARCO#548,Stockton,Ca MMB0732 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number: ARCO#548,Stockton,CA Reported: <br /> Sacramento CA,95833 Project Manager: Vern Elarth 03/18/03 18:06 <br /> Total Purgeable Hydrocarbons(C6-CI0)by EPA 8015B modified,BTEXM by EPA 8021B-Quality Control <br /> Sequoia Analytical-Morgan Hill <br /> ' Reporting Spike Source %REC - RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPP Limit Notes <br /> Batch 3B27021-EPA 5030B{PIT] <br /> Blank 3B27021-BLK1 Prepared&Anal ed:02/27/03 <br /> Gasoline Range Organics(C6-C10) ND 10 mg/ml Air <br /> Benzene ND 0.10 " <br /> Toluene ND 0.10 " <br /> Ethylbenzene ND 0.10 ' <br /> Xylenes(total) ND 0.10 " <br /> Methyl tert-butyl ether ND 0.50 " <br /> Surrogate:a,a,a-Trifluorotoluene 1.17 2.00 108 56-134 <br /> Laboratory Control Sample(3B27021-BSI) Prepared&Analyzed:02/27/03 <br /> Benzene 2.11 0.14 mg/m'Air 2.00 106 62-125 <br /> 2.08 0.10 2.00 104 68-121 <br /> *Toluene <br /> Ethylbenzene 2.16 0.10 2.00 108 75-125 <br /> Xylenes(total) 6.54 0.10 6.00 109 76-121 <br /> Surrogate:a,a,a-Trifluorotoluene 2.10 1.00 105 56-134 <br /> Laboratory Control Sample(3B27021-BS2) _ Prepared&Analyzed:02/27/03 <br /> Gasoline Range Organics(C6-C10) 50.6 10 mg/ml Air 50.0 101 65-142 <br /> Surrogate:a,a,a-Trifluorotoluene 2.86 2.00 143 56-134 S-02 <br /> Laboratory Control Sample Dup(3B27021-BSDI) _ _ Prepared&Analyzed:0212710.3 <br /> Benzene 2.17 0.10 mg/m'Air 2.00 108 62-125 2.80 31 - -� <br /> Toluene 2.14 0.10 2.00 107 68-I21 2.84 29 <br /> Etbylbenzene 2.22 0.10 2.00 111 75-125 2.74 32 <br /> Xylenes(total) 6.70 0,10 6.00 112 76-121 2.42 29 <br /> Surrogate:a,a,a-Trifluorotoluene 2.13 1.00 106 56-134 <br /> Laboratory Control Sample Dup(3B27021-BSD2) Prepared&Anal)2ed:02/27/03 <br /> Gasoline Range Organics(C6-CIO) 49.6 10 mg/ml Air 50.0 99.2 65-142 2.00 50 <br /> Surrogate:a,a,a-Trifluorotoluene 2.91 " 2.00 146 56-134 S-02 <br /> �equoia Analytical-Morgan)-fill 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 /> 7 of 9 <br />