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1551 Indusinal Road <br /> Sequoia San Carlos CA 94070 <br /> (650)232-9600 <br /> • FAX(650)232-9612 <br /> A n alytl ca l www sequoialabs corn <br /> -Ryan/G eostrategtes(1) Protea Unocai(4) <br /> 6 Sierra Court, Suite 3 Project Number Former Unocal SSI12859 Stockton,CA Reported <br /> Dublin CA 94568 Project Manager Deanna Harding 09106/0) 12 14 <br /> Volatile Organic 8 ONygenated Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - San Carlos <br /> Reporting Spike Source %REC RPD <br /> ,Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1080103 - EPA {0308 JP/TJ <br /> Blank (1080103-BLK1) Prepared&Analyzed 08/23/01 <br /> Ethanol ND 1000 ug/i <br /> 1,2-Dibromoethane ND 2 0 " <br /> 1,2-Dichloroethane ND 2 0 " <br /> Di-isopropyl ether ND 2 0 " <br /> Ethyl teri-butyl ether ND 2 0 " <br /> Methyl ten-butyl ether ND 2 0 " <br /> Teri-amyl methyl ether ND 2 0 " <br /> Tert-butyl alcohol ND 100 " <br /> Surrogate 1 2-Dichloroethane-d4 508 500 102 76-114 <br /> Surrogate Toluene-d8 515 500 103 88-110 <br /> LCS (1080703-BSI) Prepared&Analyzed 08/23/0) <br /> Me teri-bury[ether 57 7 2 0 ug/1 50 0 �988 <br /> 70-130 <br /> Su a 12 Dichloroethane-d4 50 1 SO 0 76-114 <br /> Surrogate Toluene-d8 49 4 SO 0 $8-11 d <br /> Matrix Spike(1080103-MS1) Source L108103-103 Prepared&Analyzed 08/23/01 <br /> Methyl tert-butyl ether 587 2 0 ug/I 500 20 113 60-140 <br /> Surrogate 12-Dichloroethane-d4 500 300 100 76-114 <br /> Surrogate Toluene-d8 508 SO 0 101 88-110 <br /> Matrix Spike Dup(1080103-)ISD1) Source L108103-03 Prepared&Analyzed 08/23/01 <br /> Methyl tent-butyl ether 573 2 0 ugh 500 2 0 111 60-140 2 41 25 <br /> Surrogate 1,2-Dichloroethane-d4 499 500 998 76-114 <br /> Surrogate Toluene-d8 494 500 98 8 88-110 <br /> SdWa 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 15 of 22 <br />