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a— ) (4Se uoia 885 Jarvis q Morgan Hill,CA 950375037 <br /> Analytical <br /> 08)776-9600 <br /> FAX(408)782-6308 <br /> www se+auoialabs con <br /> URS Corporation rt i Project ARCO#4493,Stockton,Ca <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number ARCO#4493,Stockton,CA Reported <br /> Sacramento CA,95833 Project Manager Vern Elarth 11/11/02 07 04 <br /> Volatile Orgame Compounds by EPA Method 8260B-Quality Control <br /> Sequoia Analytical -Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %RFC Limits RPD Limit Notes <br /> Batch 2KO8011-EPA 5035 <br /> Blank(2K08011-BLK1) Prepared&Analyzed 11/08/02 <br /> Surrogate 4-Bromofluorobenzene 499 ug/kg 500 998 60-140 <br /> LCS 2K08011-BSl Prepared&Analyzed 11/08/02 <br /> Benzene 102 050 ug/kg 10 0 102 60-140 <br /> Methyl tert-butyl ether 12 5 5 0 10 0 125 60-140 <br /> Benzene 10 2 5 0 100 102 60-140 <br /> Toluene 9 15 5 0 100 91 5 60-140 <br /> Chlorobenzene 945 050 n 10 0 94 5 60-140 <br /> 1,1-Dichloroethene 977 050 100 977 60-140 <br /> Toluene 9 15 050 100 91 5 60-140 <br /> Trichloroethene 11 4 050 100 114 60-140 <br /> Surrogate 12-Dichloroethane-d4 456 500 91 2 60-140 <br /> Surrogate Dibromofluoromethane 529 500 106 60-140 <br /> •Surrogate 1 2-Dichloroethane-d4 456 500 91 2 60-140 <br /> Surrogate Toluene-d8 4 00 500 800 60-140 <br /> Surrogate 4-Bromofluorobenzene 4 84 500 968 60-140 <br /> LCS(2K08011-BS2) Prepared&Analyzed I1/08/02 <br /> Methyl tort-butyl ether 12 0 5 0 ug/kg 840 143 60-140 Q-LIM <br /> Benzene 597 5 0 5 28 113 60-140 <br /> Toluene 32 7 5 0 31 8 103 60-140 <br /> Surrogate 1,2-Drchloroethane-d4 447 500 894 60-140 <br /> Sequoia Analytical-Morgan Hili The results in this report apply to the samples analyzed in accordance with the chain <br /> • of custody document This analytical report must be reproduced in its entirety <br /> 10 of 11 <br />