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f 819 Striker Avenue Suite 8 <br /> Sequoia J Sacramento C99830 <br /> 4 Sequoia (916)9Z2 1-9600 <br /> FAX(916)921-0100 <br /> Analytical www secluoialabs corn <br /> Gettler-Ryan-Rancho Cordova Project Tosco 6981,Stockton,CA 5207245 <br /> 3140 Gold Camp Dr,Ste 170 Project Number NIA Reported <br />_ Rancho Cordova CA,95670 Project Manager Dave Vossler 08/02/02 15 03 <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 2070270-EPA 5030B(PIT) <br /> Blank(2070270-BLKl) Prepared&Analyzed 07/26/02 <br /> Purgeable Hydrocarbons ND 50 ug/1 <br /> Benzene ND 050 " <br /> Toluene ND 0 50 " <br /> Ethylbenzene ND 0 50 " <br /> Xylenes(total) ND 050 " <br /> Methyl Cert-butyl ether ND 25 " <br /> Surrogate a a a-Trifluoro toluene 937 " 100 94 60-140 <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 25 100 112 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/1 too 102 70-130 3 25 <br /> Toluene 106 050 100 106 70-130 2 25 <br /> Ethylbenzene 109 0 50 100 109 70-130 3 25 <br /> Xylenes(total) 320 050 300 107 70-130 1 25 <br /> Methyl tert-butyl ether 121 25 100 121 70-130 8 25 <br /> Surrogate a a a-Trifluorotoluene 978 100 98 60-140 <br /> Batch 2080017-EPA 5030E(PIT) <br /> Blank(2080017-BLK1) Prepared&Analyzed 08/01/02 <br /> Purgeable Hydrocarbons ND 50 ug/l <br /> Benzene ND 050 " <br /> Toluene ND 050 <br /> Ethylbenzene ND 0 50 <br /> Xylenes(total) ND 050 " <br /> Methyl tert-butyl ether ND 25 " <br /> Surrogate a a a-Trrfluorotoluene 105 11100 105 60-140 <br /> Sequoia Analytical- Sacramento The results in this report apply to the samples analyzed in accordance with the chain <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 4 of 6 <br />