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885 Jarvis <br /> � Sequoia Mcrpnxi0,CA9503737 <br /> Analytical (408)772.9600 <br /> FAX(408)782-6308 <br /> www.mquoialabs.can <br /> URS Corporation[1] Project: ARCO#2093,Tracy,CA NILL0775 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number: ARCO#2093,Tracy,CA Reported: <br /> Sacramento CA,95833 Project Manager: Vern Elarth 01/10/03 12:48 <br /> gasoline (2-Methylpentane to 1,2,4-Trimethylbenzene) and BTEX by EPA 8015M and 8021B- Quality Contra <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3010078-EPA 5030B P <br /> Blank(3010078-BLK2) Prepared&Analyzed:01/06/03 <br /> Pwgeable Hydrocarbons ND 50 ug/l <br /> Benzene ND 0.50 " <br /> Toluene ND 0.50 " <br /> Ethylbenzene ND 0.50 " <br /> Xylenes(total) ND 0.50 " <br /> Surrogate:a,a,a-Triuorotoluene 9.72 10.0 97 60-140 <br /> Blank(3010078-BLK3) Prepared&Analyzed:01/07/03 <br /> Purgeable Hydrocarbons ND 50 u8/1 <br /> Benzene ND 0.50 " <br /> Toluene ND 0,50 <br /> 40 thylbenzene ND 0.50 <br /> ylenes(total) ND 0.50 " <br /> Surrogate:a,a,a-Tr!fluorotoluene 9.88 " 10.0 99 60-140 <br /> Laboratory Control Sample(3010078-BS2) Prepared&Analyzed:01/06/03 <br /> Benzene 10.0 0.50 ug/l 10.0 100 70-130 <br /> Toluene 10.0 0.50 10.0 100 70-I30 <br /> Ethylbenzene 9.64 0.50 10.0 96 70-130 <br /> Xylenes(total) 29.2 0.50 30.0 97 70-130 <br /> Surrogate:a,a,a-Trijluorotoluene 10.6 10.0 106 60-140 <br /> Laboratory Control Sample(3010078-BS3) Prepared&Analyzed:01/07/03 <br /> Benzene 10.0 0.50 ug/l 10.0 100 70-130 <br /> Toluene 9.64 0.50 10.0 96 70-130 <br /> Ethylbenzene 10.5 0.50 10.0 105 70-130 <br /> Xylenes(total) 32.4 0.50 30.0 108 70-130 <br /> Surrogate:a,a,a-TriJJuorotoluene 10.2 10.0 102 60-140 <br /> Sequoia Analytical-Morgan Hill 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 wet weight basis. <br /> This analytical report must be reproduced in its entirety, <br /> 5 of 8 <br />