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i <br /> Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364 9Z33 <br /> 404 N Wtget Lane Walnut Creek CA 94598 (925)988-9600 FAX(9Z5)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-Sac Project ARCO 2168 Stockton CA Sampled 8/12/98 <br /> 1433 N Market Blvd Project Number 2231200 <br /> Sacramento,CA 95834 Received S/f3/98 <br /> Project Manager Dave Foley Reported 8/31/98 <br /> Volatile Organic Compounds by EPA Method 8260A <br /> Sequoia Analytical-Sacramento <br /> Batch Date Date Surrogate Reporting <br /> 4nalyte Number Prepared Analyzed Limits <br /> Limit Result Units Notes* <br /> p Y <br /> 4W-5(54')(gOntinued <br /> 1 ert-amyl methyl ether 8080280 8/26/98 8/26/98 �_ <br /> 20 0 ND ug/l 2,D <br /> surrogate 1 2-DCA-d4 600-140 900 % <br /> r- • stun-Lu Water <br /> ert-butyl alcohol. 8080280 8126/98 8/26/98 20000 ND ug/1 2,D <br /> 4ethyl tert-butyl ether 200 ND " <br />)1-isopropyl ether 2,13 <br /> thy/ tert-bury200 ND 2,D[ether 200 ND " <br /> ert-amyl methyl ether 2,D <br /> urrogare 1 2-DCA-d4 " 60 0-140 200 ND 2,13 <br /> 94 0 <br /> 5808136-07 Water <br /> W- Y, cohol 8080280 8/26/98 8/26/98 200 ND ug/1 <br /> ethyl tert-butyl ether 200 ND " <br /> i-isopropyl ether 2 00 ND <br /> hyl tert-butyl ether 2 00 ND " <br /> rt-amyl methyl ether 2 00 ND " <br /> arrogate 1 2-DCA-d4 600-140 840 <br /> uoia Analy�ticall-Sacramento *Refer to end of report for text of tiotes and definit+ons <br /> aid W Bobel,Client Services Rep sentative <br /> Page 5 of 10 <br />