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819 Striker Ave Ste 8 <br /> Sequoia Sacramento,CA 95834 <br />' A (916)921-9600 <br /> Analytical <br /> FAX(916)921-0100 <br /> www sequoialabs cam <br /> Solutions Inc-Walnut Creek Project San Joaquin HSA 5306244 <br /> J�est:on <br /> 1575at Blvd,Ste 212 Project Number N/A Reported <br /> WalnCreek CA,94596 Project Manager Jessica Levine 06/25/03 17 35 <br />' Gasoline(2-Methylpentane to 1,2,4-Trimethylbenzene)and BTEX by EPA 8015M and 8021B- Quality Control <br /> Sequoia Analytical-Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3060257-EPA 5030B(PP1) <br />' Blank 3060257-BLK4 Prepared&Analyzed 06/13/03 <br /> Methyl tert-butyl ether ND 2 0 ug/l <br />' Surrogate aa a-Tr fluorotoluene 852 11 100 85 60-140 <br /> Laborato Control Sample 3060257-BSl Prepared&Analyzed 06/17/03 <br /> Benzene 10 1 0 50 ug/l too 101 70-130 <br /> Toluene 940 050 n 100 <br /> 94 70-130 <br /> Ethylbenzene 9 87 050 too 99 70-I30 <br /> Xylenes(total) 302 050 300 <br /> 101 70-130 <br />' Methyl tert-butyl ether 11 7 2 0 100 <br /> 117 70-130 <br /> Surrogate a a a-Trrfluorotoluene 999 100 100 60-140 <br /> dbaboratory Control Sample 3060257-BS2 Prepared&Analyzed 06/18/03 <br /> Benzene 927 050 u911 100 93 70-130 <br /> 1 Toluene 864 050 100 86 70-130 <br /> Etbylbenzene 924 050 10 0 92 70-130 <br /> Xylenes(total) 267 050 300 89 70-130 <br />' Methyl tent-butyl ether 103 2 0 too" 103 70-130 <br /> Surrogate a a a-Trifluorotoluene 950 100 95 60-140 <br />' <br /> Laboratory Control Sample 3060257-BS3 Prepared&Analyzed 06/19/03 <br /> Benzene 9 56 050 ug/1 too 96 70-130 <br /> Toluene 893 050 loo 89 70-130 <br /> tEtbylbenzene 941 050 100 94 70-130 <br /> Xylenes(total) 279 050 300 93 70-130 <br /> Methyl tert-butyl ether 10 3 2 0 " 10 0 103 70-130 <br />' Surrogate a a a-Trifluorotoluene 107 100 107 60-140 <br />' <br /> Laboratog Control Sample 3060257-BS4 Prepared&Analyzed 06/13/03 <br /> Benzene 9 88 0 50 ug/l 100 99 70-130 <br /> Toluene 10 0 0 50 1. 100 100 70-130 <br /> 1 Sequoia Analytical-Sacramento 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 an a wet wefghf.- <br /> basis This analytical report must be reproduced in its entirely <br /> Page 9 of 11 <br />