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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (925)988 9600 FAX(925)988 9673 <br /> 819 Sinker Avenue Swte 8 Sacramento CA 95834 (916)921 9600 FAX(916)921-0 100 <br /> IQLWAnalytical 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792 1865 FAX(707)792-03442 <br /> 1551 Industnal Road San Carlos CA 94070 41 1 1 (650)232 9600 FAX(650)232 9612 <br /> is <br /> /ancon- Pinnacle Project Arco 2iG8, Stockton,CA Sampled 2/17/99 to 2/18/99 <br /> 3939 Cambridge Road,Ste 202 Project Number 21775-234 004 Received 2/18/99 <br /> Cameron Park,CA 95682 Project Manager Dave Foley Reported 3/4/99 <br /> Volatile Oxygenate 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 % Nates* <br /> Batch, 2Q20259 Da to-Prepared. 212_3199 <br /> Blare 9020259; KI <br /> Tert-butyl alcohol 2/23/99 ND ug/l 200 <br /> Methyl tert-butyl ether ND 2 00 <br /> Di-isopropyl ether ND 200 <br /> Ethyl tert-butyl ether ND 200 <br /> Tert-amyl methyl ether ND " 200 <br /> Ethanol KD 3000 <br /> Surrogate 1 2-DCA-d4 500 570 600-140 114 <br /> LCS 9020259-RSI <br /> Methyl tert-butyl ether 2/23/99 500 566 ug/I 700-130 113 <br /> Surrogate 12-DCA-d4 500 562 600-140 112 <br /> Matrix Spik 9020259-MSI S902260-02 <br /> NIMI tert-butyl ether 2/23/99 500 ND 59 8 ug/I 600-140 120 <br /> SMWgate 1,2-DCA-d4 11 Soo 576 600-140 115 <br /> Matrix Spm fun _ S902260-OZ <br /> Methyl tert-butyl ether 2/23/99 500 ND 604 ug/I 600-140 121 250 0 830 <br /> Surrogate 1 2-DCA-d4 500 572 600-140 114 <br /> t <br /> cqIW Analytical- Sacramento *Refer to end of,eport for text of notes and definitions <br /> onald W Bobel,Client Services Represe tative Page 9 of 10 <br />