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Sequoia 680 Chesapeake Dnve Redwood City, CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988%73 <br /> Analytical 819 Sinker Avenue,Suuc 8 Sacramento CA 95834 (916) 921 %00 FAX(916)921 0100 <br /> Upgradient Environmental Consultants Project Conrady Sampled 4124/98 <br /> 336 Augusta Court Project Number N/A Received 4/24/98 <br /> Valley Sp,CA 95252 Project Manager Vic Cherven Reported 5/13/98 <br /> Volatile Organic Compounds by EPA Method 8260A/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,. 8050064 Date Prepared. ,4130198 Extraction Method, EPA„50308 IMeOg1 <br /> Blank 8050064-HLj I <br /> Ten-butyl alcohol 4/30198 ND ug/l 200 <br /> Methyl tert-butyl ether ND 200 <br /> Di-isopropyl ether ND 200 <br /> Ethyl tert-butyl ether ND 2 00 <br /> Tert-amyl methyl ether ND 2 00 <br /> L cs 8050064-BSI <br /> Methyl tert-butyl ether 4130/98 500 42 3 ug/I 700-130 846 <br /> Matrix Satke 8050064-MSL 5804222-00 <br /> Methyl tert-butyl ether 4/30/98 500 ND 38 7 ug/l 600-140 774 <br /> Aft.trixSpike DuoDuo $050064-MSD1 S804222-00 <br /> ethyl tert-butyl ether 4/30/98 500 ND 476 ug/l 600-140 952 25 0 206 <br /> Batch, 8050065 Date Prepare, 5/1198 Extraction Method, EPA 5030B,[MeOHI <br /> Blank 8050065-BLKI <br /> Tert-butyl alcohol 511/98 ND ug/l 200 <br /> Methyl tert-butyl ether 11 ND 2 00 <br /> Di-isopropyl ether ND 200 <br /> Ethyl tert-butyl ether ND 200 <br /> Tert-amyl methyl ether ND 200 <br /> LSA 805_004.5-13S1 <br /> Methyl tert-butyl ether 5/1/98 500 53 l ug/l. 700-130 106 <br /> Matrix Spike 8050065_ S804222-00 <br /> Methyl tert-butyl ether 4/30198 500 ND 38 7 ug/l 600-140 774 <br /> Matrix Spike Duo 8050065-MSDI 5804222-00 <br /> Methyl tert-butyl ether 4/30198 500 ND 47 6 ug/I 600-140 952 250 206 <br /> Batch. 8050077 F.xtractiQn Method, EPA 50308[Pal <br /> $lank 8050077-BjIKI <br /> Tert-butyl alcohol 5/5/98 ND ug/I 200 <br /> Methyl tert-butyl ether ND 2 00 <br /> Oeqaquoia <br /> -isopropyl ether ND 2 00 <br /> A alytieal-Sacram nto *Refer to end of report for text of notes and definitions <br /> 0 11nda C Schnetder,Laboratory Director Page 8 of 10 <br />