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q ass Jarvis Dr <br /> 4D Sequoia Morgan Hill,CA 95037 <br /> (408)776-9600 <br /> IW Analytical FAX(408)782-6308 <br /> WWW sequoialabs can <br /> Secor-Rancho Cordova Project ARCO#2133,Rancho Cordova,CA MLL0909 <br /> 3017 Kilgore Rd Suite 100 Project Number ARCO#2133,Racho Cordova,CA Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 01/10/03 13 35 <br /> =asollne (2-Methylpentane to 1,2,4-Trlmethylbenzene) and BTEX by EPA 8015M and 8021B - Quality Contro <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2120505-EPA 5030B PIT <br /> Blank(2120505-BLK1) Prepared&Analyzed 12/30/02 <br /> Purgeable Hydrocarbons ND 50 ug/1 <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 0 50 " <br /> Methyl tert-butyl ether ND 2 0 " <br /> Surrogate a a a-Trifluorotoluene 102 100 102 60-140 <br /> Laboratory Control Sample(2120505-BSI) Prepared&Analyzed 12/30/02 <br /> Benzene 101 050 ug/1 100 101 70-130 <br /> Toluene 106 050 100 106 70-130 <br /> .Ethylbenzene 101 050 100 101 70-130 <br /> Xylenes(total) 305 050 300 102 70-130 <br /> Methyl tert-butyl ether 101 20 100 101 70-130 <br /> Surrogate a a a-Trifluorotoluene 11 7 100 117 60-140 <br /> Laboratory Control Sample Dup(2120505-BSD1) Prepared&Analyzed 12/30/02 <br /> Benzene 967 050 ug/l 100 97 70-130 4 25 <br /> Toluene 10 2 050 100 102 70-130 4 25 <br /> Ethylbenzene 991 050 100 99 70-130 2 25 <br /> Xylenes(total) 29 7 050 300 99 70-130 3 25 <br /> Methyl tert-butyl ether 107 20 100 107 70-130 6 25 <br /> Surrogate aaa-Triuorotoluene 114 100 114 60-140 <br /> Sequoia Analytical-Morgan Hill The results to 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 /> 4 of 5 <br />