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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 94596 (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 /> EMC ON-Sac Project ARCO 2130 Stockton,CA Sampled 9/1/98 <br /> 1433 N Market Blvd Project Number 21775-229 003 Received 9/2/98 <br /> Sacramento,CA 95834 Project Manager Dave Foley Reported 9/24/98 <br /> Notes and Definitions <br /> # Note <br /> I Chromatogram Pattern Weathered Gasoline C6-C12+ Unidentified Hydrocarbons C6-C[2 <br /> 2 Chromatogram Pattern Weathered Gasoline C6-C[2 <br /> 3 Chromatogram Pattem Unidentified Hydrocarbons C6-Cl2 <br /> 4 Chromatogram Pattern Unidentifired Hydrocarbond C6-C9 <br /> 5 The spike recovery for this QC sample is outside of established control limits due to sample matrix Interference <br /> DET Analyte DETECTED <br /> ND Analyte NOT DETECTED at or above the reporting limit <br /> NR Not Reported <br /> dr 10 <br /> Sample results reported on a dry weight basis <br /> Recov Recovery <br /> RPD Relative Percent Difference <br /> i)equ0nalytical-Sacramento <br /> Zonald W Bobel,Client Ser,ices Representative <br /> Page 7 of 7 <br />