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ISS]Industrial Road <br /> Sequoia San Carlos CA 94070 <br /> Analytical (654)232-9600 <br /> FAX(650)232-9612 <br /> ijWwww sequoialabs corn <br /> er-Ryan/Geostrate¢tes(I) Project Unocal(4) L208029 <br /> Sierra Court. Suite I Protect Number Former Unocal 42859 Stockton Reported <br /> Dublin CA 94568 Project Manager Deanna Harding 08/28/02 11 23 <br /> Total Purgeable Hydrocarbons (C6-C10) by EPA 8015B modified, BTEXM by EPA 8021B - Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> Reporting Spike Source %RPC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2H22001 -EPA 5030B IP/Tl <br /> Blank(2H22001-BLK1) Prepared&Analyzed 08/22/02 <br /> Gasoline Range Organics(C6-C10) 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 ten-butyl ether ND 25 " <br /> Surrogate aaa-Triuorotoluene 947 100 94 7 70-130 <br /> Laboratory Control Sample(2H22001-BSI) Prepared&Analvzed 08/22/02 <br /> Benzene 104 050 ug/I 100 104 70-130 <br /> Toluene 105 0 50 100 105 70-130 <br /> enzene 9 97 0 50 100 99 7 70-130 <br /> s(total) 323 050 300 108 70430 <br /> Surrogate a a a-Triuorotoluene 103 100 103 70-130 <br /> Laboratory Control Sample(21-122001-BS2) Prepared&Analyzed 08/22/02 <br /> Gasoline Range Organics(C6-C10) 284 50 ug/l 250 114 70-130 <br /> Surrogate a,a,a-Trtfluoroioluene 9 77 1. 100 977 70-130 <br /> Matrix Spike(2H22001-MSI) Source ML110353-12 Prepared&Analyzed 08/22/02 <br /> Gasoline Range Organics(C6-C10) 417 50 ug/l 550 ND 758 60-140 <br /> Benzene 827 050 6 60 ND 125 60-140 <br /> Toluene 384 0 50 " 397 ND 967 60-140 <br /> Ethylbenzene 8 75 050 920 ND 920 60-140 <br /> Xylenes(total) 468 050 " 461 ND 102 60-140 <br /> Surrogate a a a-Triuorotoluene 103 100 103 70-130 <br /> Matrix Spike Dup(21122001-MSD1) Source MLH0353-12 Prepared&Analyzed 08/22/02 <br /> Gasoline Range Organics(C6-C10) 519 50 ugll 550 ND 944 60-140 21 8 25 <br /> Benzene 8 64 050 660 ND 131 60-140 438 25 <br /> to Analytical - San Carlos The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless oihenvtse stated results are reported on a wet weight basis <br /> This analytical report must he reproduced in its entirety <br /> Page 18 of 25 <br />