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819 Straker Ave Ste 8 <br /> Sequoia Sacramento C95834 <br /> (9!6)921-9600 <br /> Analytical www eqseq�9210 100 <br /> uotalabs pom <br /> ' Geological Technics,Inc Project Montas Bros 5504379 <br /> 1101 7th Street Project Number 724 2 Reported <br /> ' Modesto CA,95354 Project Manager Mandeep Singh 05/05/05 10 29 <br /> Purgeable Hydrocarbons and BTEX by EPA 8015B/8021B-Quality Control <br /> Sequoia Analytical- Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Lumt Units level Result %REC Limits RPD Limit Notes <br /> Batch 5040250-EPA 50308 /T /EPA 8015B/8021B <br /> Laboratory Control Sample(5040250-BS2) Prepared&Analyzed 04/21/05 <br /> Benzene 921 050 ug/l 100 92 70-130 <br /> Toluene 924 050 100 92 70-130 <br /> Ethylbenzene 932 050 100 93 70-130 <br /> Xylenes(total) 27 1 050 300 90 70-130 <br /> Methyl tent-butyl ether 837 20 100 84 70-130 <br /> Surrogate 4-BFB(FID) 103 100 103 60-140 <br /> Surrogate a a a-TFT(PID) 832 100 83 60-140 <br /> ' Matrix Spike(5040250-MSI) Source S504379-08 Prepared&Analyzed 04/21/05 <br /> Benzene 848 050 ug/l 100 ND 85 60-140 <br /> Toluene 932 050 100 ND 83 60-140 <br /> Ethylbenzene 836 050 100 ND 84 60-140 <br /> Wylencs(total) 246 050 " 300 ND 82 60-140 <br /> ethyl tert-butyl ether 894 20 100 ND 89 60-140 <br /> Surrogate 4-BFB(FID) 707 100 107 60-140 <br /> Surrogate a a a-TFT(PID) 809 100 81 60-140 <br /> Matnx S tke Dup(5040250-MSDI) Source 5504379-08 Prepared&Analyzed 04/21/05 <br /> Benzene 914 050 ug/l 100 ND 91 60-140 7 25 <br /> ' Toluene 900 050 100 ND 90 60440 8 25 <br /> Etbylbenzene 909 050 100 ND 91 60-140 8 25 <br /> Xylenes(total) 267 050 300 ND 89 60 140 8 25 <br /> Methyl tort-butyl ether 947 20 " too ND 95 60 140 6 25 <br /> Surrogate 4-BFB(FID) 997 100 100 60-140 <br /> Surrogate a a a-TFT(PID) 784 100 78 60-140 <br /> Sequoia Analytical-Sacramento 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 /> Page 9 of 10 <br />