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Sequoia 1551 Industrial Road <br />' San Carlos CA 94070 <br /> Analytical (650)232-9600 <br /> FAX(650)232-9512 <br /> www sequoialabs corn <br /> F47 <br /> ler-Ryan/Geostrategies(1) Project Unocal(4) <br /> Sierra Court, Suite J Project Number Former Unocal#5098, Stockton Reported <br /> lin CA,94568 Project 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 /> tch 2060030-EPA 5030B [P/TJ <br /> strix Spoke(2060030-MSI) Source L206013-33 Prepared&Analyzed 06/19/02 <br /> Benzene 205 2 0 ug/l 200 ND 102 60-140 <br /> Ilorobenzene 213 20 200 ND 106 60-140 <br /> -Dichloroethene 226 2 0 200 ND 113 60-140 <br /> Toluene 216 20 200 ND 108 60-140 <br /> 11 hloroethene 221 2 0 200 ND 106 60-140 <br /> rogate 1,2-Dichloroethane,44 11 1 100 111 76-114 <br /> Surrogate Toluene-d8 966 100 966 88-110 <br /> trix <br /> ogate 4-BFB 917 " 100 91 7 86-115 <br /> Spike Dup(2060030-MSDI) Source L206013-33 Prepared&Analyzed 06/19/02 <br /> Benzene 192 TO 19/1 200 ND 960 60-140 655 25 <br /> orobenzene 207 20 200 ND 104 60-140 2 86 25 <br /> Dichloroethene 203 2 0 " 200 ND 102 60-140 107 25 <br /> Toluene 208 20 200 ND 104 60-140 377 25 <br /> bablQraethene 203 20 200 ND 965 60-140 849 25 <br /> e 1,2-Dichloroethane-d4 109 100 109 76-114 <br />,urrogate Toluene-d8 990 100 .990 88-110 <br /> Iogate 4-BFB 9 02100 902 86-115 <br /> ch 2060032-EPA 5030B [P/TJ' <br /> 31ank(2060032-BLKI) Prepared&Analyzed 06/20/02 <br /> tene ND 20 ug/1 <br /> oberizene ND 2 0 „ <br />,romochloromethane ND 20 „ <br /> odichloromethane ND 2 0 <br /> oform ND 2 0 " <br /> romoinethane ND 50 " <br /> I <br /> ylbenzene ND 2 0 ^, <br /> utylbenzene ND 2 0 <br />:rt-butyl benzene ND 20 „ <br /> on tetrachloride ND 2 0 „ <br /> benzene ND ?0 " <br /> n orocthane ND 5 0 " <br /> o'"m ND 2 0 " <br /> omethane ND 5 0 " <br /> o"Coluene ND 2 0 „ <br />^hlorotoluene ND 2 0 " <br /> ora 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 he reproduced in its entirety <br /> Page 85 of 103 <br />