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819 Striker Avenue,Suite 8 <br /> Sequoia <br /> Sacramento.916 9Z -9&)o <br /> 4 4D <br /> (916)921-9600 <br /> FAX(916)921-0100 <br /> Analytical www.sequoialabs.com <br /> SECOR International-Rancho Cordova Project: ARCO 4493,Stockton,CA Sampled: 6119/00 <br /> 3017 Kilgore Road,Suite 100 Project Number: N/A Received: 6/23100 <br /> Rancho Cordova,CA 95670 Project Manager: Rusty Benkosky Reported: 7/6/00 <br /> Total Purgeable Hydrocarbons(C6-C12),BTEX and MTBE by DHS LUFT/Quality Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> lAnal.,qe Analyzed Level Result Result Units Recov. Limits % Limit % Notes* <br /> Batch: 0060312 Date Prepared: 6129/00 Extraction Method: EPA 5030B_(MeOH) <br /> Blank 0060312-BLK1 <br /> Purgeable Hydrocarbons 6/29/00 ND ug/1 50.0 <br /> Benzene ND 0.500 <br /> Toluene ND 0.500 <br /> Ethylbenzene ND 0.500 <br /> Xylenes(total) ND 0.500 <br /> _Methyl tert-butyl ether __ _" _ ND 2.50 <br /> Surrogate: a,a,a-Trifluorotoluene 10.0 9.68 60.0-140 96.8 <br /> IL-cs- 0060312-BS 1 <br /> Benzene 6/29/00 10.0 10.9 ug/I 70.0-130 109 <br /> Toluene 10.0 10.9 70.0-130 109 <br /> Eth /benzene 10.0 IIA 70.0-130 111 <br /> 30.0 - 33.1 70.0-130 110 <br /> l tort-butyl ether _ 10.0 11.7 7_0.0-130 117 <br /> Surrogate: a,a,a-TriAuorotoluene 10.0 9.58 60.0-140 95.8 <br /> Matrix Spike 0060312-MSI 5006308-01 <br /> Benzene 6129/00 10.0 ND 10.8 ug/1 60.0-140 108 <br /> Toluene 10.0 ND 11.2 60.0-140 112 <br /> Ethylbenzene 10.0 ND 11.2 60.0-140 112 <br /> Xylenes(total) h 30.0 ND 33.5 60.0-140 112 <br /> Mcthyl tort-butyl ether 10.0 ND 8.08 60.0-140 80.8 <br /> Surrogate: a,a,a-Triuorotaluene 10.0 9.23 60.0-140 92.3 <br /> Matrix Soike-Dup 0060312-MSD1 5006308-01 <br /> Benzene 6/29100 10.0 ND 10.3 ug/1 60.0-140 103 25.0 4.74 <br /> Toluene 10.0 ND 10.6 60.0-140 106 25.0 5.50 <br /> Ethylbenzene 10.0 ND 10.5 60.0-140 105 25.0 6.45 <br /> Xylenes(total) 30.0 ND 31.4 60.0-140 105 25.0 6.45 <br /> Methyl tert-butyl ether 10.0 ND 11.4 60.0-140 114 25.0 34.1 3 <br /> Surrogate: a,a,a-Trifluorotoluene 10.0 9.21 60.0-140 92.1 <br /> 40 <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions. <br /> Page 18 of 26 <br />