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819 Striker Avenue Suite 8 <br /> Sequoia Sacramento CA 95834 <br /> (916)92 1-96W <br /> FAX(916)921-0100 <br /> Analytical www secluoialabs coin <br /> Gettler-Ryan-Rancho Cordova Project Unocal 0187, Stockton,CA 5207242 <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 /> Analyte Result Limit Units Level Result %REC Limits RPD Lamit Notes <br /> Batch 2070270-EPA 5030B PIT <br /> Laboratory Control Sample(2070270-BS1) Prepared&Analyzed 07/26/02 <br /> Benzene 105 050 ug/l 100 105 70-130 <br /> Toluene 108 050 100 108 70-130 <br /> Ethylbenzene 112 050 100 112 70-130 <br /> Xylenes(total) 324 050 300 108 70-130 <br /> Methyl tert-butyl ether 112 2 5 100 112 70-130 <br /> Surrogate a a a-Trifluorotoluene 983 100 98 60-140 <br /> Laboratory Control Sample Dup(2070270-BSD1) Prepared&Analyzed 07/26/02 <br /> Benzene 102 050 ug/l 100 102 70-130 3 25 <br /> Toluene 106 050 100 106 70-130 2 25 <br /> Ethylbenzene 109 050 100 109 70-130 3 25 <br /> es(total) 320 050 300 107 70-130 1 25 <br /> IlWyl tert-butyl ether 121 25 100 121 70-130 8 25 <br /> Surrogate a a a-T'ntfluorotoluene 978 100 98 60-140 <br /> IV <br /> uoia 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 9 of 10 <br />