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819 Striker Avenue Suite 8 <br /> 4 Sequoia (9 6)92 ento CA89600 <br /> FAX(916)921-0100 <br /> iwAnalytical www sequoialabs corn <br /> Gettler-Ryan-Rancho Cordova Project Former Unocal 2859,Stockton,CA 5210536 <br /> 3140 Gold Camp Dr,Ste 170 Protect Number NIA Reported <br /> Rancho Cordova CA,95670 Project Manager Geoffrey D Rtsse 11/08/02 18 35 <br /> Total Purgeable Hydrocarbon, BTEX and MTBE by DHS LUFT - Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2100387-EPA 5030B P <br /> Laboratory Control Sample(2100387-BS1) Prepared&Analyzed 10/25/02 <br /> Benzene 11 1 050 ug/I 100 111 70-130 <br /> Toluene 108 050 100 108 70-130 <br /> Ethylbenzene 100 050 100 100 70-130 <br /> Xylenes(total) 325 050 300 108 70-130 <br /> Methyl tert-butyl ether 109 25 too 109 70-130 <br /> Surrogate a a a-Trifluorotoluene 108 100 108 60-140 <br /> Laboratory Control Sample(2100387-BS2) Prepared&Analyzed 10/28/02 <br /> Benzene 109 050 ugll 100 109 70-130 <br /> Toluene 110 050 100 110 70-130 <br /> Ethylbenzene 921 050 100 92 70-130 <br /> rhyres(total) 328 050 300 109 70-130 <br /> l tent-butyl ether 447 25 100 45 70-130 Q-28 <br /> Surrogate a a a-Trifluoroioluene 970 100 97 60-140 <br /> Laboratory Control Sample(2100387-BS3) Prepared&Analyzed 10/29/02 <br /> Benzene 103 050 ug/1 100 103 70-130 <br /> Toluene 101 050 100 101 70-130 <br /> Ethylbenzene 102 050 100 102 70-130 <br /> Xylenes(total) 311 050 300 104 70-130 <br /> Methyl tert-butyl ether 11 1 25 too 111 70-130 <br /> Surrogate a a a-Trifluorotoluene 104 100 104 60-140 <br /> Laboratory Control Sample(2100387-BS4) Prepared&Analyzed 10/30/02 <br /> Benzene 100 050 ug/l 100 100 70-130 <br /> Toluene 104 050 100 104 70-130 <br /> Etbylbenzene 9 93 050 100 99 70-130 <br /> Xylenes(total) 300 050 300 100 70-130 <br /> Methyl tert-butyl ether 997 2 5 100 100 70-130 <br /> Surrogate a a a-Trifluorotoluene 983 100 98 60-140 <br /> 'qWuoia 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 8 <br />