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680 Chesapeake Drive Redwood City CA 94063 (650)364 9600 FAX(650)364-9233 <br /> Sequoia 404 N VV,get Lane Walnut Creek CA 94598 (510)988-9600 FAX(510)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> Analytical <br /> 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707)792 0342 <br /> w <br /> Gettler Ryan/Geostrategies Client Project ID Unocal 6981, Stockton <br /> 6747 Sierra Court, Ste J <br /> Dublin, CA 94568 <br /> Attention Clyde Galantine QC Sample Group 9805h68 Reported Jun 13, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015 <br /> Analyst <br /> ANALYTE Gasoline <br /> QC Batch # GC05309813TEX03A <br /> Sample No GW9805H91 <br /> Date Prepared 5/30198 <br /> Date Analyzed 5130198 <br /> Instrument I D # GCHP03 <br /> Sample Cone , ug/L N D <br /> Conc Spiked ug1L 250 <br /> Matrix Spike, ug/L 220 <br /> % Recovery 88 <br /> Matrix <br /> Spike Duplicate ug/L 210 <br /> % Recovery 84 <br /> Relative % Difference 4 7 <br /> RPD Control Limits 0-25 <br /> LCS Batch# GWBLK053098ABS <br /> Date Prepared 5130/98 <br /> Date Analyzed 5130198 <br /> Instrument I D # GCHP03 <br /> Cone Spiked, ug/L 250 <br /> LCS Recovery, ug]L 230 <br /> LCS % Recovery 92 <br /> Percent Recovery Control Limits <br /> MSlMSD 60140 <br /> LCS 70 130 <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 is an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure It <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 />