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680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (510)988-9600 FAX(510)988-9673 <br /> a- — 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 /> • <br /> Blaine Tech Services-« - « Client Proj ID Shell 141 N El Dorado «« Sampled«04/22/98 <br /> 1680 Rogers Avenue Sample Descript MW-4 Received 04/24/98 <br /> San Jose, CA 95112 Matrix LIQUID = <br /> Analysis Method 8015Mod/8020 Analyzed 05/05/98 - <br /> Attention Fran Thie Lab Number 9804G89-06 -Reported 05114198 = <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEX and MTBE <br /> Analyte Detection Limit Sample Results <br /> ug/L ug/L. <br /> TPPH as Gas 50 N D <br /> Methyl t-Butyl Ether -- ... 2.5 ... ... - 3.9 <br /> Benzene 0 50 N D <br /> Toluene 0 50 N D <br /> Ethyl Benzene 0 50 N D <br /> Xylenes (Total) 0 50 N D <br /> Chromatogram Pattern <br /> Surrogates Control Limits% % recovery <br /> Trifluorotoluene 70 130 92 <br /> Analytes reported as were not present above the stated limit of detection <br /> SEQU IA A ICAL - ELAP #1210 <br /> P P n <br /> Project Manager Page 6 <br />