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Sequoia 680 Chesapeake Drive Redwood City,CA,../63 (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 Sacramento,CA 95834 (916) 921-9600 FAX(916)921-0100 <br /> AW 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: 7/28198 <br /> Total Purgeable Hydrocarbons(C6-C12)and BTEX by DHS Lurr/Quality Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> IAnalytc Analyzed Level Result Result Units Recov.Limits % Limit % Notes' <br /> LCS(continued) 8070261-BSI <br /> Ethylbenzene 7/21/98 0.200 0.197 mg/kg 70.0-130 98.5 <br /> Xylenes(total) 0.600 0.581 70.0.130 96.8 <br /> Surrogate: a,a,a-Triuorotoluene 0.200 0.111 60.0-140 105 <br /> Matrix Spike 8070261-MSI 0807129-02 <br /> Benzene 7/21/98 0.200 ND 0.185 mg/kg 60.0-140 92.5 <br /> Toluene 0.200 ND 0.179 60.0-140 89.5 <br /> Ethylbenzene 0.200 ND 0.178 60.0-140 89.0 <br /> Xylenes(total) 0.600 ND 0.534 60.0-140 89.0 <br /> Surrogate: a,a,a-Tris luorotoluene 0.200 0.108 60.0-140 104 <br /> Matrix Spike Duo 8070261-MSDI 5907128-02 <br /> Benzene 7/21/98 0.200 ND 0.185 mg/kg 60.0-140 92.5 25.0 0 <br /> Toluene 0.200 ND 0.179 60.0-140 89.5 25.0 0 <br /> Ethylbenzene 0.200 ND 0.178 60.0-140 89.0 25.0 0 <br /> Xylenes(total) 0.600 ND 0.534 60.0-140 89.0 25.0 0 <br /> Surrogate. a,a,a-Triiluorotoluene 0.100 0.209 60.0-140 105 <br /> Sequoia Analytical-Sacramento "Refer to end of report jar tett of notes and definitions. <br /> nda C.Schneider,Laboratory Director Page 6 of 9 <br />