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1551 Industrial Road <br /> Sequoia San Carlos CA 94070 <br /> (650)232-9600 <br /> Analytical FAX(650)232 9612 <br /> www sequoialabs corn <br /> ler-Ryan/Geostrategies(1) Project Unocal(4) <br /> Sierra Court,Suite l Project Number Former Unocal#5098& Mantgmery Ward Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 03/26/02 I2 44 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - San Carlos <br /> Reporting Spike Source %RRC RPD <br /> naiyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> atch 2030017-EPA 5030B JP/T] <br /> Matrix Spike(2030017-MSI) Source L203015-06 Prepared 03/07/02 Analyzed 03/08/02 <br /> tenzene 181 20 ug/l 200 ND 905 60-140 <br /> hlorobenzene 190 20 200 ND 950 60-140 <br /> IJ-Dichloroethene 164 20 200 ND 820 60-140 <br /> oluene 186 20 200 ND 93 0 60-140 <br /> nchloroethene 188 20 200 ND 940 60-140 <br /> Surrogate 12-Dichloroethane-d4 970 100 970 63-118 <br /> rrogate Toluene d8 979 " 100 979 88-110 <br /> ri ogaie 4-BFB 104 100 104 86-115 <br /> Matrix Spike Dup(2030017-MSDI) Source L203015-06 Prepared 03/07/02 Analyzed 03/08/02 <br /> Ienzene 176 20 ug/1 200 ND 880 60-140 2 80 25 <br /> hIorobenzenc 181 20 200 ND 905 60-140 4 85 25 <br /> 1,1-Dichloroethene 164 20 200 ND 820 60-140 000 25 <br /> 179 2 0 200 ND 895 60-140 394 25 <br /> methene 18 2 20 200 ND 91 0 60-140 3 24 25 <br /> Surrogate 1 2-Dichloroethane-d4 102 100 101 63-118 <br /> trogate Toluene-d8 998 100 998 88-110 <br /> rrogate 4-BFB 102 " 100 101 86-115 <br /> Batch 2030023-EPA 5030B [P/Tl <br /> Blank(2030023-BLKI) Prepared&Analyzed 03/14/02 <br /> enzene ND 20 ug/1 <br /> Bromobenzene ND 20 <br /> tmochloromethane ND 20 " <br /> modichloromethane ND 2 0 " <br /> Bromoform ND 20 " <br /> rmomethane ND 50 <br /> Butylbenzene ND 20 " <br /> ser-Butyl benzene ND 20 " <br />(rt-butylbenzene ND 20 " <br /> rbon tetrachloride ND 20 <br /> loroberizene ND 20 " <br /> loroethane ND 5 0 " <br /> ]orofarm ND 20 " <br /> loromethane ND 50 " <br /> 2-Chlorotoluene ND 20 <br /> Chlorotoluene ND 20 " <br /> S 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 84 of 91 <br />