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680 Chesapeake Drove Redwood Cry CA 94063 650) 364-9600 FAX(650) 364-9233 <br /> Sequoia 404 N Wlget Lane Walnut Creek.CA 94598 1925)988-9600 FAx(925)9138-9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)92I-0100 <br /> 1455 McDowell Nvd North Ste D Petaluma,CA 94958 707) 792-1865 FAX(707)792-0342 <br /> Gettler Ryan/Geostrategles Client Project ID Unocal SS#0123 <br /> 6747 Sierra Court, Ste J <br /> Dublin, CA 94568 <br /> Attention Deanna Harding QC Sample Group 980SH50 Reported Nov 25, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015A <br /> Analyst A PORTER <br /> ANALYTE Diesel <br /> QC Batch 0 GCO930980HBPEXZ <br /> Sample No 9809F69-2 <br /> Date Prepared 9/30198 <br /> Date Analyzed 1014198 <br /> Instrument I D 9 GCHP5A <br /> Sample Conc , ug/L 89 <br /> Conc Spiked ug]L 1000 <br /> Matnx Spike, ug/L 810 <br /> % Recovery 72 <br /> . Matrix <br /> � Spike Duplicate, ugll 720 <br /> % Recovery 63 <br /> Relative % Difference 13 <br /> RPD Control Limits 0-50 <br /> LCS Batch# BLK093098ZS <br /> Date Prepared 9130198 <br /> Date Analyzed 1014/98 <br /> Instrument I D ll GCHP5A <br /> Conc Spiked ug1L 1000 <br /> Recovery, ug1L 680 <br /> LCS % Recovery 68 <br /> Percent Recovery Control Limits <br /> MSIMSD 50 150 <br /> LCS 60 140 <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 fail 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 />