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819 Striker Avenue Suite 8 <br /> Sequoia 916) 9� <br /> (9151911-9600 <br /> Analytical FAX equo gabs com <br /> www sequoialabs com <br /> Gettler-Ryan-Rancho Cordova Project Former Unocal 2859,Stockton,CA S210536 <br /> 3140 Gold Camp Dr,Ste 170 Project Number N/A Reported <br /> Rancho Cordova CA,95670 Project Manager Geoffrey D Risse 11/08/02 18 35 <br /> Total Purgeable Hydrocarbon,BTEX and MTBE by DHS LUFT - Quality Control <br /> Sequoia Analytical - Sacramento <br /> Repurtmg Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2100387-EPA 5030B PIT <br /> Laboratory Control Sample(2100387-BS5) Prepared&Analyzed 10/31/02 <br /> Benzene 101 050 ug/l 100 101 70-130 <br /> Toluene 103 050 100 103 70-130 <br /> Ethylbenzene 10 2 050 100 102 70-130 <br /> Xylenes(total) 306 050 300 102 70-130 <br /> Methyl tert-butyl ether 105 25 100 105 70-130 <br /> Surrogate a a a-Tr fluorotoluene 927 100 93 60-140 <br /> Matrix Spike(2100387-MSI) Source 5210535-05 Prepared&Analyzed 10/29/02 <br /> Benzene 100 050 ug/l 100 ND 96 60-140 <br /> Toluene 971 050 100 ND 97 60-140 <br /> Ethylbenzene 880 050 100 ND 88 60-140 <br /> Wes(total) 286 050 „ 300 ND 95 60-140 <br /> YJ <br /> tert-butyl ether 760 2 5 10 0 ND 64 60-140 <br /> Surrogate a a a-Trflriorotoluene 760 100 76 60-140 <br /> Matrix Spike Dup(2100387-MSDI) Source 5210535-05 Prepared&Analyzed 10/29/02 <br /> Benzene 843 050 ug(l 100 ND 80 60-140 17 25 <br /> Toluene 795 050 100 ND 80 60-140 20 25 <br /> Ethylbenzene 745 050 100 ND 74 60-140 17 25 <br /> Xylenes(total) 248 050 300 ND 83 60-140 14 25 <br /> Methyl tert-butyl ether 660 25 100 ND 54 60-140 14 25 <br /> Surrogate a a a-Tnfluorotoluene 562 100 56 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 />