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819 Striker Avenue Suite 8 <br /> Sacramento CA 95834 <br /> Sequoia (916)921-9600 <br /> 4 FAX(916)921-0 100 <br /> ID <br /> !Qr Analytical www sequoialabs`om <br /> 40 — <br /> Gettler-Ryan-Rancho Cordova Project Former Unocal 0187, Stockton,CA S208305 <br /> 3140 Gold Camp Dr,Ste 170 Project Number N/A Reported <br /> Rancho Cordova CA,95670 Project Manager David Herzog 08/29/02 11 37 <br /> Total Purgeable Hydrocarbon,BTEX and MTBE by DHS LUFT - Quality Control <br /> Sequoia Analytical- Sacramento <br /> Reporting Spike Source %REG RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2080290-EPA 5030B P/T <br /> Blank(2080290-BLK1) Prepared&Analyzed 08/28/02 <br /> Purgeable Hydrocarbons NO 50 ug/l <br /> Benzene NO 0 50 " <br /> Toluene NO 050 " <br /> Ethylbenzene NO 050 " <br /> Xylenes(total) NO 050 " <br /> Methyl tent-butyl ether NO 25 " <br /> Surrogate a a a-Trifluorotoluene 970 100 97 60-140 <br /> Laboratory Control Sample(2080290-BSI) Prepared&Analyzed 08/28/02 <br /> Benzene 9 55 0 50 ug/l loo 96 70-130 <br /> Toluene 102 0 50 100 102 70-130 <br /> Wenzene 101 050 100 101 70-130 <br /> es(total) 31 1 050 300 104 70-130 <br /> Methyl tert-butyl ether 110 25 100 110 70-130 <br /> Surrogate a a a-Tnfluorotoluene 961 100 96 60-140 <br /> Matrix Spike(2080290-MSI) Source S208338-02 Prepared&Analyzed 08/28/02 <br /> Benzene 939 050 ug/l 100 ND 94 60-140 <br /> Toluene 999 050 100 ND 100 60-140 <br /> Ethylbenzene too 0 50 100 NO 100 60-140 <br /> Xylenes(total) 308 0 50 300 NO 103 60-140 <br /> Methyl tert-butyl ether 106 25 100 NO 106 60-140 <br /> Surrogate a a a-Trifluorotoluene 969 100 97 60-140 <br /> Matrix Spike Drip(2080290-MSDI) Source 5208338-02 Prepared&Analyzed 08/28/02 <br /> Benzene 962 0 50 ug/l 100 NO 96 60-140 2 25 <br /> Toluene 10 2 050 100 NO 102 60-140 2 25 <br /> Ethylbenzene 10 0 0 50 100 NO 100 60-140 0 25 <br /> Xylenes(total) 312 0 50 300 NO 104 60-140 1 25 <br /> Methyl tert-butyl ether 110 2 5 100 NO 110 60-140 4 25 <br /> Surrogate a a a-Trtfluorotoluene 950 100 95 60-140 <br /> oia Analytical-Sacramento 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 7 of 8 <br />