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680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-96W FAX(916)921-0100 <br /> 455 McDowell Blvd North Ste b Petaluma CA 94954 (707) 792-1865 FAX(707)792-0342 <br /> Analytical ',551 Industrial Road San Carlos CA 94070-4111 (650)232-9600 FAX(650)232-9612 <br /> Sequoia Analytical-San Carlos Project N/A Sampled 5/6/99 <br /> 1551 Industrial Blvd Project Number (WO#L905084) Received 5111199 <br /> San Carlos,CA 94070 Protect Manager Mike Gregory Reported 5/21/99 <br /> Diesel Hydrocarbons(ClO-C24)by DHS LUFT/Quality Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov Limits % Limit % Notes* <br /> Batch 905OZ¢2 Date Prepared, 5118199 Extraction Mf1hod—EPA 3510B <br /> Blan 9050202-BLKI <br /> Extractable Hydrocarbons 5/19/99 ND mg/l 00500 <br /> Surrogate Pentacosane " 00400 00413 500-150 103 <br /> AU 9050202-BSI <br /> Extractable Hydrocarbons 5119199 100 0 921 mg/l 600-140 92 1 <br /> Surrogate Pentacosane " 00400 00372 500-150 930 <br /> LCS Dun 9050202-BSDI <br /> Extractable Hydrocarbons 5/19/99 1 00 1 03 mg/1 600-140 103 500 1 l 2 <br /> Surrogate Pentacosane " 00400 00457 11500-150 114 <br /> Batch. 9050221 Dam„prepared. 5119199 Extraction Method, EPA 35106 <br /> Blank 2050221-B LK 1 <br /> Extractable Hydrocarbons 5/20/99 ND mg/l 00500 <br /> Surrogate Pentacosane " 00400 00392 500-150 980 <br /> L-Cs 9050221-BS1 <br /> Extractable Hydrocarbons 5120199 100 0 983 mg/l 600-140 983 <br /> Surrogate Pentacosane " 00400 00416 500-150 104 <br /> LCS Dull <br /> Extractable Hydrocarbons 5/20199 100 1 02 mg/1 600-140 102 500 3 69 <br /> Surrogate Pentacosane 00400 00476 500-150 119 <br /> Sequoia Analytical -Sacramento *Refer to end of report for text of notes and definza <br /> Sandra R Hanson,Client Services Representative Page 3 of 4 <br />