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15$1 Industrial Road ' <br /> Sequoia San Carlos(650) A94000 <br /> Analytical (650)232-96ofl <br /> FAX(650)232-9612 <br /> �vww sequoialabs cram <br /> Gettler-Ryan/Geostrategies(1) Project Unocal(4) <br /> 6747 Sierra Court, Suite J Project Number Former Unocal#E5098,Stockton Reported <br /> Dublin CA,94568 PrcUoct Manager Deanna Harding 07/01/02 07 46 <br /> Volatile Organic 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 2060032 -EPA 5030B [P/T <br /> Matrix Spike Dup(2060032-MSDI) Source L206021-25 Prepared 06/20/02 Analyzed 06/21/02 <br /> Benzene 19 9 2 0 ug/l 200 ND 995 60-140 538 25 <br /> Chlorobenzene 200 2 0 200 ND 100 60-140 723 25 <br /> 1,1-Dichloroethene 206 2 0 200 ND 103 60-140 6 57 25 <br /> Toluene 205 2 0 200 ND 102 60-140 751 25 <br /> Trichloroethene 205 2 0 200 ND 102 60-140 430 25 <br /> Surrogate 1,2-Dichloroethane-d4 101 100 101 76-114 <br /> Surrogate Toluene-d8 996 100 996 88-110 <br /> Surrogate 4-BFB 893 100 893 86-115 <br /> _Batch 2060034-EPA 5030B [P/TJ <br /> Blank(2060034-BLK1) Prepared&Analyzed 06/21/02 <br /> Benzene ND 20 ug/I <br /> Bromobenzene ND 2 0 <br /> Bromochloromethane ND 2 0 " <br /> Bromodichloromethane ND 20 " <br /> Bromoform ND 2 0 " <br /> Bromomethane ND 5 0 <br /> =n-Butylbenzene— — — ND 2 - <br /> sec-Butylbenzene ND 2 0 <br /> —Tert-butylbenzene— - - -- —ND= 20--- <br /> Carbon <br /> 0--Carbon tetrachloride ND 2 0 <br /> 'Chlorobenzene - - -- -- - --� - '- ND ---�---- 20 - = - -- — -- --- -- -- - - - _---- -- --r- <br /> Chloroethane ND 50 e <br /> Chloroform ND 2 0 " <br /> Chloromethane . ND' 50 <br /> 2-Chlorotoluene LL ND 2 0 <br /> 4-Chlorotoluene ND 20 " <br /> Dibromochloromethane ND 2 0 " <br /> 1,2-Dibromoethane ND 2 0 f ' <br /> Dibromomethane ND 2 0 " <br /> 1,2-Dibromo-3-chloropropane ND 50 " <br /> 1,2-Dichlorobenzene - ND 2 0 <br /> 1,3-Dichlorobenzene ND 2 0 <br /> 1,4-Dichlorobcnzene ND 20 " <br /> Dichlorodifluoromethane ND 50 <br /> 1,1-Dichloroethane ND 2 0 <br /> Sequoia 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 90 of 103 ' <br />