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1551 Industria!Road <br /> Sequoia San Cazlos CA 94670 <br /> (650)232-9690 <br /> AX o)232-9612 <br /> Analytical www.sequoialabs.com <br /> C- ?r-Ryan/Geostrategies(1) Project: Tosco(1) <br /> 6747 Sierra Court,Suite 3 Project Number: UNOCAL SS411195,LATHROP,CA Reported: <br /> Dublin CA,94568 Project Manager: Deanna Harding 08/28/01 07:22 <br /> Tolal Purgeable Hydrocarbon (C6-C1.2) by EPA 8015M and BTEXINITBE by EPA 8021B - Quality Control <br /> Sequoia Analytical - San Carlos <br /> Reponing Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1080106-EPA 5030B(P/T)- <br /> Blank(1080306-BLKI) Prepared&Analyzed:08124/01 <br /> Purgeable Hydrocarbons as Gasoline 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 /> Methyl ler]-butyl ether ND 5.0 " <br /> Surrogate:a,a,a-Triuorololuene 9.17 10.0 92,7 70-130 <br /> LCS(1080106-BSI) Prepared&Analyzed:08/24/01 <br /> Benzene 9.22 0.50 ug/l 10.0 92.2 ' 70-130 <br /> Toluene 9.14 0.50 10.0 91.4 70-130 <br /> Ethylbenzene 9.44 0.50 10.0 94.4 70-130 <br /> Xvf-_.:, (total) 28.0 0.50 30.0 93.3 70-130 <br /> t' ite:a,a,a-Truororoluene 10,4 J0.0 104 70-130 <br /> LCS(1080706-BS2) Prepared&Analyzed:08/24/01 <br /> Purgeable Hydrocarbons as Gasoline 216 50 ugfl 250 86,4 70-130 <br /> Surrogate:a,a,a-Triuororoluene 11.3 10,0 113 70-130 <br /> Matrix Spike(1080106-M 51} Source: L108076-04 Prepared:08/24/01 Analyzed:08/25/01 <br /> Benzene 8.92 0.50 ug/l 10.0 ND 89.2 60-140 <br /> Toluene 8.94 0.50 10.0 ND 89.4 60-140 <br /> Fthylbenzene 9.35 0.50 10.0 ND 93.5 60-140 <br /> Xylenes(total) 28.0 0.50 30.0 ND 93.3 60-140 <br /> Surrogate:a,a,o-Triifluorotoluene 10.6 10.0 106 70-130 <br /> Matrix Spike Dup(1080106-MSDI) Source: L108076-04 Prepared:08/24/01 Analyzed:08/25/0) <br /> Benzene 9.98 0.50 ug/l 10.0 ND 99.8 60-140 11.2 25 <br /> Toluene 9.82 0.50 10.0 ND 98,2 60-140 9.38 25 <br /> Ethylbenzene 10.1 0.50 10.0 ND 101 60-140 7.71 25 <br /> Xylenes(total) 30.2 0.50 30.0 ND 101 60-140 7.56 25 <br /> Surrogate:a,a,a-Treuororoluene 10.6 10.0 106 70-130 <br /> 5�, , is Analytical-San Carlos The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document. This analytical report must be reproduced in its entirety. <br /> Page 13 of 22 <br />