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1551 Industrial C al Road <br /> � Sequoia San Carlos CA 94070 <br /> (650)232-9600 <br /> FAX 0)232-9612 <br /> Analytical wwseq oialabscom <br /> www sequoialabs com <br /> y r-Ryan/Geostrategies(1) Project Unoca](4) <br /> Sierra Court Suite J Project Number Former Unocal SS42859 Stockton,CA Reported <br /> Dublin CA 94568 Project Manager Deanna Harding 09/06/01 12 14 <br /> Total Purgeable Hydrocarbons (C6-Cl2), BTEX and MTBE by DHS LUFT - Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analvte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch l H28003- EPA 5030B JP/TJ <br /> Blank (IH28003-BLKI) Prepared&Analyzed 08/28/01 <br /> Purgeable Hydrocarbons ND 50 ug/1 <br /> Benzene ND 0 50 <br /> Toluene ND 0 50 " <br /> Ethvlbenzene ND 0 50 " <br /> Xvlcnes(total) ND 050 " <br /> Methyl tert-butyl ether ND 2 5 " <br /> Surrogate a a a-Trrfluororoluene 109 100 109 70-130 <br /> LCS(1H28003-BSI) Prepared&Analyzed 08/28/01 <br /> Benzene 9 87 050 ug/l 100 987 70-130 <br /> Toluene 105 0 50 100 105 70-130 <br /> Ethylbenzene 107 0 50 100 107 70-130 <br /> X es(total) 31 8 0 50 300 106 70-130 <br /> to a a a-Triuororoluene 108 100 108 70-130 <br /> LCS (IH28003-BS2) Prepared&Analyzed 08/28/01 <br /> Purgeable Hydrocarbons 255 50 ug/l 250 102 70-130 <br /> Surrogate aaa-Tr fluorotoluene 11 7 11100 117 70-130 <br /> Matrix Spike(1H28003-I\7S1) Source MKH0553-04 Prepared&Analyzed 08/28/01 <br /> Purgeable Hydrocarbons 240 50 ug11 250 ND 960 60-140 <br /> Surrogate aaa-Tr,fluorotoluene 14 1 10 0 141 70-130 5-02 <br /> I►9atrtx Spike Dup(1H28003-IMS1011) Source 1N1<H0553-04 Prepared&Analyzed 08/28/01 _ <br /> Purgeable Hydrocarbons 274 50 ug/1 250 ND 110 60-140 13 2 25 <br /> Surrogate a,a a-Trifluorololuene 141 100 141 70-130 S-02 <br /> SW to Analytical - San Carlos The results in this report apply to the samples anal}-.ed in accordance with the chain of <br /> custody document This analytical report must be reproduced to its entirety <br /> Page 17 of 22 <br />