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i. Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364 9133 <br /> 404 N Wrget lane Walnut Creek CA 94598 (925)988 9600 FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-010 0 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Gettler Ryan/Geostrategies Client Project ID 6981, 140124 0214707 Pacific <br /> 6747 Sierra Court, Suite J <br /> Dublin, CA 94568 <br /> Attention Steve C QC Sample Group 981 OG49 Reported Oct 29, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015 <br /> Analyst MM <br /> ANALYTE Gasoline <br /> OC Batch # GC102398BTEX17A <br /> Sample No GW981OA62-04 <br /> Date Prepared 10/23/98 <br /> Date Analyzed 10/23/98 <br /> Instrument I D # GCHP17 <br /> Sample Cone , ug/L N D <br /> Cone Spiked, ug/L 250 <br /> Matrix Spike, ug/L 250 <br /> % Recovery 100 <br /> wMatrix <br /> Spike Duplicate, ug/L 240 <br /> % Recovery 96 <br /> Relative % Difference 4 1 <br /> RPD Control Limits 0-25 <br /> LCS Batch# GC102398BTEX17A <br /> Date Prepareu 10123/98 <br /> Date Analyzed 10/23/98 <br /> Instrument I D # GCHP17 <br /> Cone Spiked ug/L 250 <br /> LCS Recovery, ug/L 250 <br /> LCS % Recovery 100 <br /> Percent Recovery Control Limits <br /> MS/MSD 60140 <br /> LCS 70130 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> Please Note <br /> The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents <br /> •SEQUOIA ANALYTICAL preparation and analytical methods employed for the samples The matrix spike i5 an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure if <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference the LCS recovery is to be used to validate the batch <br /> Tod Granicher <br /> Project Manager <br />