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Sequoia %w 680 Chesapeake Drive Redwood City,CA ,.063 (415) 364-9600 FAX(415) 364-9233 <br /> 404 N.Wiget Lane Walnut Creek,CA 94598 (510) 988.9600 FAX(510)988-9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921-9600 FAX(916)921-0100 <br /> �,,,7 <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 /> Diesel Hydrocarbons(C10-C24)by DHS LUFT/Quality Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> lAnalyte Analyzed Level Result Result Units Recov.Limits % Limit % Notes• <br /> Batch: 8070237 Date Prepared: 7/20198 Extraction Method: FPA 3550A <br /> Blank 8070237-BLK1 <br /> Extractable Hydrocarbons 7/21/98 ND mg/kg 1.00 <br /> Surrogate. Pentacosane 0.500 0.677 50.0-150 135 <br /> LC.S 8070237-BSI <br /> Extractable Hydrocarbons 7/21198 12.5 10.3 mg/kg 60.0-140 82.4 <br /> Surrogate: Pentacosane " 0.500 0.643 50.0-150 129 <br /> Matrix Spike 8070237-MSI S907206-01 <br /> Extractable Hydrocarbons 7/21/98 12.5 28.9 ND mg/kg 50.0-150 NR 3 <br /> Surrogate: Pentacosane " 0.500 ND 50.0-150 NR <br /> Matrix SpikeDup 8070237-MSDI S907206-01 <br /> Extractable Hydrocarbons 7/21/98 12.5 28.9 ND mg/kg 50.0-150 NR 50.0 3 <br /> Surrogate: Pentacosane 0.500 ND 50.0-150 NR <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions. <br /> Li da C.Schneider,Laboratory Director Page 7 of 9 <br />