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t: <br /> 885 Jarvis Drive <br /> Morgan Hill,CA 95037 <br /> Sequoia 44081 776-9(M ll <br /> FAX(408)782.6308 <br /> Analytical www.sequolatabs.coro <br /> Gaer Ryan/Geostrategies-Tosco/Unocal Project: <br /> 6747 Sierra Ct,Suite J Project Number: Unocal SS#08671 Reported: k <br /> Dublin CA,94568 Project Manager: Deanna Harding �' 06/12/01 18:10 <br /> Total Purgeable Hydrocarbons (C6-C12), BTEX and MTBE by DHS LUFT - Quality Control <br /> q <br /> Sequoia Analytical -Morgan Hill N { <br /> Reporting Spike Source �` %REC RPD 1 <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes I <br /> 7 <br /> Batch 1E31003-EPA 5030B IP/T] _ <br /> Blank(IE31003-BLK1) Prepared&Analyzed:05131/01 <br /> Purgeable Hydrocarbons ND 50.0 ug/I :E <br /> i <br /> Benzene ND 0.500 <br /> Toluene ND 0.500 } <br /> Ethylbenzene ND 0.500 <br /> + Xylenes(total) ND 0.500 n !` <br /> Methyl tent-butyl ether ND 2.50 <br /> Surrogate:a,a,o-Trifluorotoluene 10.4 10.0 104 70-130 <br /> LCS(1E31003-BSI) Prepared&Analyzed:05/31/01 k <br /> Benzene 8.98 0.500 ugll 10.0 89.8 70-130 <br /> ene 9.23 0.500 10.0 92.3 70-130 <br /> r,ylbenzene 9.37 0.500 10.0 93'.7 70-130 ' <br /> i <br /> Xylenes(total) 28.1 0.500 30.0 93,7 70-130 ' <br /> Surrogate.a,a,a-Triuorotoluene 10.5 T0.0 105 70-130 <br /> Matrix Spike(IE31003-MS1) Source:MKE0651-01 Prepared&Analyzed:05/31/01 <br /> Benzene 9.33 0.500 ugfl 10.0 ND 93.3 60-140 <br /> Toluene 9.52 0.500 10.0 ND 95.2 60-140 <br /> Ethylbenzene 9.58 0.500 10.0 ND 95.8 60-140 <br /> Xylenes(total) 28.5 0.500 " 30.0 ND 95.0 60-140 <br /> Surrogate:a,a,a-Triuorotoluene 11.1 10.0 111 70-130 <br /> iF <br /> Matrix Spike Dup(1E31003-MSDI) Source:MKE0651-01 Prepared&Analyzed:05/31/01 <br /> r <br /> i Benzene 9.73 0.500 .. ug/t 10.0 ND 97.3 60-140 4.20 25 I <br /> Toluene 9.93 0.500 10.0 ND 99.3 60-140 4.22 25 <br /> Ethylbenzene 9.87 0.500 , 10.0 ND 98.7 60-140 2.98 25 j <br /> Xylenes(total) 28.6 0.500 " 30.0 ND 95.3 60-140 0.350 25 j <br /> Surrogate:a,a,a-Trivarotoluene 11.3 " 10.0 113 70-130 <br /> i <br /> I <br /> g1301a AnalytICal-MOrgan Hill 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 Page 7 of 10 <br /> i <br />