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P� <br /> t1►` 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX 1650) 364-9233 <br /> Sequoia 404 N %MSet lane Walnut Creek CA 94598 (9ZS)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)79Z-0342 <br /> Gettler Ryan/Geostrategies Client Project 10 Unocal SS#0123 <br /> 6747 Sierra Court, Ste J <br /> Dublin, CA 94568 <br /> Attention Deanna Harding QC Sample Group 98091-150 Reported Nov 25, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015 <br /> Analyst TP/GR <br /> ANALYTE Gasoline <br /> QC Hatch # GC1107988TEX17A <br /> Sample No GW98101-11-5 <br /> Data Prepared 11/6198 <br /> Date Analyzed 11/6/98 <br /> Instrument 10 # GCHP17 ' <br /> Sample Conc , ug/L N D <br /> Conc Spiked, ug/L 250 <br /> Matrix Spike, ug/L 200 <br /> % Recovery 81 <br /> "'Spike Duplicate, uglL 160 <br /> 9'4 Recovery 63 <br /> Relative % Difference 25 <br /> RPD Control Limits 0-25 <br /> LCS Batch# GC1107988TEX17A <br /> Date Prepared 11/7/98 <br /> Date Analyzed 11/7/98 <br /> Instrument I D # GCHP1 7 <br /> Conc Spiked, ug/L 250 <br /> LCS Recovery, ug/L 250 <br /> LCS % Recovery 100 <br /> Percent Recovery Control Limits <br /> MSIMSD 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 If <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> Tod Granicher nterference the LCS recove(y is to be used to validate the batch <br /> Project Manager <br />