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819 Stnker Avenue Suite 8 <br /> Sequoia Sacramento C95634 <br /> (916)921-9600 1-9600 <br /> 4 <br /> FAX(916)921 A 100 <br /> Analytical www sequotalabs corn <br /> Gettler-Ryan-Rancho Cordova Pro3ect Unocal 0187,Stockton,CA S207242 <br /> 3140 Gold Camp Dr,Ste 170 Project Number N/A Reported <br /> Rancho Cordova CA,95670 Project Manager David Herzog 07/30/02 16 41 <br /> Total Purgeable Hydrocarbon,BTEX and MTBE by DHS LUFT - Quality Control <br /> Sequoia Analytical- Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analy1e Result Limit Units Lavel Result °/uREC limits RPD Limit Notes <br /> Batch 2070227-EPA 5030B P <br /> Blank(2070227-BLK1) Prepared&Analyzed 07/23/02 <br /> Purgeable Hydrocarbons NO 50 ug/l <br /> Benzene ND 050 " <br /> Toluene NO 050 " <br /> Ethylbenzene NO 050 " <br /> Xylenes(total) NO 050 " <br /> Methyl tert-butyi ether NO 25 <br /> Surrogate a a a-Trifluorotoluene 952 100 95 60-140 <br /> Laboratory Control Sample(2070227-BSI) Prepared&Analyzed 07/23/02 <br /> Benzene 993 050 ug/i 100 99 70-130 <br /> Toluene 102 050 100 102 70-130 <br /> isbenzene 104 0 50 100 104 70-130 <br /> nes(total) 302 050 300 101 70-130 <br /> Methyl tert-butyl ether 9 88 25 100 99 70-130 <br /> Surrogate a a a-Trifluorotaluene 100 100 100 60-140 <br /> Laboratory Control Sample Dup(2070227-BSD1) Prepared&Analyzed 07/23/02 <br /> Benzene 970 0 50 ug/1 100 97 70-130 2 25 <br /> Toluene 102 0 50 1. 100 102 70-130 0 25 <br /> Ethylbenzene 105 050 100 105 70-130 1 25 <br /> Xylenes(total) 300 050 300 100 70-130 0 7 25 <br /> Methyl tert-butyl ether 115 25 100 115 70-130 15 25 <br /> Surrogate a a a-Trifluorotoluene 101 100 101 60-140 <br /> Batch 2070254-EPA 5030B P <br /> Blank(2070254-BLKl) Prepared&Analyzed 07/24/02 <br /> Purgeable Hydrocarbons NO 50 ug/1 <br /> Benzene NO 050 " <br /> Toluene NO 050 " <br /> Ethylbenzene ND 0 50 " <br /> Xylenes(total) NO 050 " <br /> Methyl tert-butyl ether NO 25 " <br /> Surrogate a a a-Trifluorotoluene 845 100 84 60-140 <br /> uola 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 6 of 10 <br />