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Road <br /> Sequoia <br /> n Carl dustrA 94070(D— <br /> San Carlos CA 94070 <br /> Analytical (450)232-9600 <br /> FAX(650)232 9612 <br /> www sequoialabs corn <br /> Gettler-Ryan/Geostrategies(1) Project Unocal(4) L208033 <br /> 6747 Sierra Court. Suite J r Project Number Former Unocal #0187 Stockton Reported <br /> Dublin CA, 94568 Project Manager Deanna Harding 08/29/02 07 10 <br /> Total Purgeable Hydrocarbons (C6-C10) by EPA 8015B modified, BTEXM by EPA 802113 - Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> " Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2H26003 -EPA 50301B LP/TJ <br /> Laboratory Control Sample(2"26003-BSI)' Prepared&Analyzed 08/26/02 <br /> Benzene 949 050 ug/l Wo 94 9 70-130 <br /> Toluene 974 050 100 974 70-130 <br /> Ethylbenzene 973 050 100 973 70-130 <br /> Xylenes(total) 286 050 300 95 3 70-130 <br /> Surrogate a a a-Trrfluorotoluene 113 100 ' 113 70-130 <br /> Laboratory Control Sample'(2H26003-BS2) Prepared&Analyzed 08/26/02 ` <br /> Gasoline Range Organics(C6-C10) 220 50 ugA 250 880 70-130 <br /> Surrogate a,a,a-Tri luorotoluene 116 100 116 70-130 <br /> Matrix Spike(2H26003-MSI) Source ML110_420-02 Prepared&Analyzed 08/26/02 . <br /> Gasoline Range Organics(C6-C10) 427 50 ug/l 550 ND 776 60-140 <br /> Benzene 8 16 050 660 ND 124 60-140 <br /> Toluene 364 050 397 ND 913 60-140 <br /> Ethylbenzene 793 0 50 920 ND 862 60-140 <br /> Xylenes(total) 407 0 50 461 ND 883 60-140 <br /> Surrogate a a,a-Trifluorotoluene 994 100 994 70-130 <br /> Matrix Spike Dup(2H26003-AISD1) - _Source MLH0420-02 Prepared&Analyzed 08/26/02 <br /> Gasoline Range Organics(C6-C10) 494 50 ugA 550 ND 89 8 60-140 14 5 25 <br /> Benzene 862 050 " 660 ND 131 60-140 548 25 <br /> Toluene 378 050 397 ND 94 9 60-140 377 25 <br /> Ethylbenzene 858 0 50 920 ND 93 3 60-140 7 87 25 <br /> Xylenes(total) 41 6 050 46 1 - ND 902 60-140 2 19 25 <br /> Surrogate a a a-Triuorotoluene 119 100 119 70-130 <br /> Sequoia Analytical- San Carlos The results in this report apply to the samples analyzed in accordance with the chain <br /> custody document Unless otherwise stated,results are reported an a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 35 of 36 <br />