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Sequoia 680 Chesapeake Drive Redwood City CA .,A3 (415) 364-9600 FAX(415)364-9233 <br /> 404 N.Wiget Lane Walnut Creek,CA 94598 (510) 988-9600 FAX(510)988-9673 <br /> 819 Striker Avenue,Suite 8 Sa uncnto,CA 95834 (916) 921-9600 FAX(916)921-0100 <br /> �„7 Analytical <br /> URS Greiner,Inc.-SF Project: Stockton-USPS Sampled: 7/7/98 to 7/8/98 <br /> 100 California Street,Ste.500 Project Number: 43-66600.32 Received: 7/10/98 <br /> San Francisco,CA 94111 Project Manager: Chris Nelson Reported: 7/28/98 <br /> Total Purgeable Hydrocarbons(C6-C12)and BTEX by DHS LUFr/Quality Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> lAnalyte Analvzed Level Result Result Units Recov.Limits % Limit % Notes* <br /> Batch: 8070260 Date Prepared: 7/20/98 Extraction Method: EPA 5030B(MeOH) <br /> Blank 8470260-BLK1 <br /> Purgeable Hydrocarbons 7.20/98 ND mg/kg 1.00 <br /> Benzene ND 0.00500 <br /> Toluene ND 0.00500 <br /> Ethylbenzene ND 0.00500 <br /> Xylenes(total) ND 0.00500 <br /> Surrogate: a,a.a-Tris luorotoluene 0.100 0.119 60.0-140 109 <br /> LLS 8070260-BSI <br /> Benzene 7/20/98 0.200 0.213 mg/kg 70.0-130 106 <br /> Toluene 0.200 0.202 70.0-130 101 <br /> Ethylbenzene 0.200 0.199 70.0-130 99.5 <br /> Xylenes(total) 0.600 0.591 70.0-130 98.5 <br /> Surrogate: a,a,a-Triuorotoluene 0.100 0.114 60.0-140 107 <br /> Matrix Spike 8070260-MSI S80712"O <br /> Benzene 7/20/98 0.200 ND 0.183 mg/kg 60.0-140 91.5 <br /> Toluene 0.200 ND 0.175 60.0-140 87.5 <br /> Ethylbenzene 0.200 ND 0.173 60.0-140 86.5 <br /> Xylenes(total) 0.600 ND 0.527 60.0-140 87.8 <br /> Surrogate: a,a,a-Tris luorotoluene 0.100 0.100 60.0-140 100 <br /> Matrix Spike Dun 8070260-MSDI 5807129-00 <br /> Benzene 7/20/98 0.200 ND 0.191 mg/kg 60.0-140 95.5 25.0 4.28 <br /> Toluene 0.200 ND 0.175 60.0-140 87.5 25.0 0 <br /> Ethylbenzene 0.200 ND 0.181 60.0-140 90.5 25.0 4.52 <br /> Xylenes(total) 0.600 ND 0.564 60.0.140 94.0 25.0 6.82 <br /> Surrogate: a,a,a-Triiluorotoluene 0.100 0.119 60.0-140 109 <br /> Batch: 8070261 Date Prepared: 7121/98 Extraction Method: EPA 50308(MeOH) <br /> Blank 8070261-BLK1 <br /> Purgeable Hydrocarbons 7/21/98 ND mg/kg 1.00 <br /> Benzene ND 0.00500 <br /> Toluene ND 0.00500 <br /> Ethylbenzene ND " 0.00500 <br /> Xylenes(total) ND 0.00500 <br /> Surrogate. a,a,a-Triiluorotoluene " 0.200 0.105 60.0-140 101 <br /> LLS 8070261-BS1 <br /> Benzene 7/21/98 0.200 0.210 mg/kg 70.0-130 105 <br /> Toluene 0.200 0.198 70.0-130 99.0 <br /> Sequoia Analytical-Sacramento *Refer to end of report for test of notes and definitions. <br /> *da C. Schneider,Laboratory Director Page 5 of 9 <br />