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' 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)3649233 <br /> Sequoia 404 N Wiget Line Walnut Creek CA 94598 (925)988-9600 FAX(9Z5)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 4954 (707) <br /> 865 FALX(707) <br /> Analytical 1551 IndDstnalllRoad BlvdNorth Ste D SaPetaluma <br /> (Carlos CA 94070-4111 (650)23Z-19600 FAX(650)232-9612 <br /> innacle-C PProject ARCO 06020,Manteca,CA Sampled 4/21199 <br /> 3939 Cambndge Road,Ste 220 Project Number N/A Received 4121/99 <br /> ameron Park,CA 95682 Project Manager Joel Coffman Re orted 4/27/99 <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 /> TAnalyte Analyzed Level Result Result Units Recov Limits % Limit % Notes* <br /> 9040281 Date Prepared, 4/23192 Extractign Metbod, EPA 5030B 1P/Tl <br /> Tert-butyl alcohol 9_QA02�KI ND ug/I 200 <br /> ethyl tert-butyl ether ND ;i 200 <br /> i-isopropyl ether ND 200 <br /> Ethyl tert-butyl ether ND 200 <br /> ert-amyl methyl ether ND 2 00 <br /> thanol ND 2 00 <br /> urrogate 1,2-DCA-d4 50 0 53 2 60 0-140 106 <br /> ethyl tert-butyl ether 4/23/� B51 <br /> 9g1- 500 626 ug/l 700-130 125 <br /> urrogate 1,1-DCA-d4 11 <br /> 500 548 of600-140 110 <br /> 9040281-MSI S904276-U <br /> thyl tert-butyl ether 4/23199 500 ND 59 8 ugll 6D 0-140 120 <br /> Surrogate 12-DCA-d4 500 552 600-140 110 <br /> V <br /> 5904276-0159 6 ug/lhyl tert-butyl ether 4/23199 Soo ND 60 0-140 119 25 0 0 837 <br /> Surrogate 12-DCA-d4 500 550 <br /> 60 0-140 110 <br /> i <br /> i <br /> equoia Analytical-Sacramento J`1 *Refer to end of report for text of notes and definitions <br /> Unald W Sobel,Client Servtces Representative Page 5 of 6 <br />