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8I9 Striker Avenue Suite 8 <br /> Sequoia Sacramento,)9 99600 <br /> 4DAnalytical (916)921-9600 <br /> FAX 921-0I00 <br /> www sequoiequoialahs cpm <br /> SECOR International-Rancho Cordova Project TOSCO 11193,Stockton,CA <br /> 3017 Kilgore Road,Suite 100 Project Number N/A Reported <br /> Rancho Cordova CA,95670 Project manager Rusty Benkosky 12/11/01 16 42 <br /> Total Purgeable Hydrocarbons, BTEX and MTBE in Air(ppmv)by DHS LUFr <br /> Sequoia Analytical-Sacramento <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-1R(Air)(S111370-041 Air Sampled 11126/01 11.30 Received, 11/27/0109.30 <br /> Purgeable Hydrocarbons ND 28 ppmv 10 1120065 11/30/01 11/30/01 DHS LUFT <br /> Benzene ND 016 <br /> Toluene ND 013 " <br /> Ethylbenzene ND 012 <br /> Xylenes(total) ND 0 12 <br /> Methyl tert-butyl ether 42 14 " <br /> Surroeate a a a-Tn/luorotoluene 700% 60-140 " <br /> EFF-1/5111170-05)Air Sampled 11/26/0112 00 Receivedz11/27/01 0930 <br /> Purgeable Hydrocarbons ND 2 8 ppmv 1 1120065 11/30/01 11/30/01 DHS LUFT <br /> Benzene ND 0 016 " <br /> Toluene ND 0 013 <br /> Ethylbenzene ND 0 012 ° <br /> Xylenes(total) ND 0 012 <br /> Methyl tert-butyl ether ND 014 " <br /> Surroirate a a a-Tnlluorotoluene 970% 60-140 " Now <br /> MW-2R(Air)(5111370-07)Air Sampled 11/26/01 13.45 Received, 11/27/0109.30 <br /> 4 <br /> Purgeable Hydrocarbons 960 140 ppmv 50 1120065 11/30/01 11/30/01 DHS LUFT HC-12 <br /> Benzene 17 080 « " <br /> Toluene ND 065 <br /> Ethylbenzene ND 060 <br /> Xylenes(total) ND 060 " <br /> Methyl tert-butyl ether 130 70 <br /> Surroeate a a a-Tnlluorotoluene 105% 60-140 " <br /> I <br /> I <br /> I <br /> Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed to accordance with the chain <br /> of custody document This analytical report must be reproduced in its entirety <br /> Page Page 3 of 10 <br />