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I <br /> Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364 9600 FAX(650)364 9233 <br /> 404 N WSet Lane Walnut Creek CA 94598 (925)988 9600 FAX(925)988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921 9600 FAX(916)921 0100 <br /> 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792 1865 FAX(707)792 0342 <br /> Emcon -Cameron Park Project Don Rogers <br /> 3939 Cambridge Road,Ste 202 Sampled 1 1/9/98 <br /> h Project 226!3-100003 Received 11/10/98 <br /> Cameron Park,CA 95682 Pra�eci Manager Mark Cap s <br /> Reported <br /> 11/24/99 <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 Anafyzed Level Result Result Units Recov Limits % Limit % \rotes* <br /> Batch, El 10250 DAte--Prcpared-,-LLZM ExtraCtion MethQd. PIP <br /> l lUd, 8I 10250-RI,K1 <br /> Ethanol 11/20/98 <br /> Fert-butyl alcohol ND ug/l 3000 <br /> vtethyl tent-butyl ether ND 200 <br /> ND <br /> 31-isopropyl ether ND 2 002 00 <br />-thyl tert-butyl ether ND 2 00 <br /> Cert-amyl methyl ether ND 2 00 <br /> urrogate 12-DCA-d4 SO 0 51 7 " <br /> 600-140 103 <br />`cs $110250_BS1 <br /> 4ethyl tert-butyl ether 11/20/98 500 486 ug/l 700-130 97 2 <br /> urrogate 11-DCA-d4 SO 0 48 4 60 0.140 968 <br /> s l l UU--M 9-01 <br /> tert-butyl ether 11/20/98 500 75 1 51 9 ug/l 600-140 NR <br /> urrogate I1-DCA-d4 3 <br /> SO 0 SI 4 600-140 103 <br />[ 4 <br /> ethyl tert-butyl ether 11/20/98 50 0 75 1 116 u /l <br /> irrogate 12-DCA d4 g 60 0-140 8I 8 25 0 NR 3 <br /> SO 0 42 0 600-140 840 <br /> uoia Analytical-Sacramento n *Refer to end ofreport far text ofnotes and definrttons <br /> . IL <br /> aid W Bobel,Client Services Representative <br /> Page 5 of 6 <br />