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SS@tll101a 6Hf)Chesapeake{Save Redwood City CA 94063 (650) 364-9600 PAX 1650) 364-9233 <br /> e d04 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(92S)988-9673 <br /> Analytical 819 Striker Avenue suite B Sacramento CA 95834 (916)9ZI-9600 FAX(916)921 0100 <br /> lco 1455 McDowelt Blvd North Ste 0 Petaluma,CA 94954 (707) 792-1865 FAX(707)792-0342 <br /> Gettler Ryan/Geostrategies Client Project ID Unocal SS#0123 <br /> 6747 Sierra Court, Ste J <br /> Dublin, CA 94568 <br /> Attention Deanna Harding QC Sample Group 9809H50 Reported Nov 25, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015 <br /> Analyst- TPlGR <br /> ANALYTE Gasoline <br /> QC Batch # GC1107988TEX17A <br /> Sample No G W981 01.11-5 <br /> Cate Prepared: 11/6/98 <br /> Date Analyzed- 1116198 <br /> Instrument 10 #- GCHP17 ' <br /> Sample Conc , ug/L N D <br /> Cone Spiked ug/L 250 <br /> Matnx Spil e, ug/L. 200 <br /> % Recovery 81 <br /> Matrix <br /> Spike Duplicate, ug/L- 160 <br /> t % Recovery 63 <br /> Relative % Difference 25 <br /> RPD Control Limits 0-25 <br /> LCS Batch# GC 1 10798STEX 17A <br /> Date Prepared 11/7/98 <br /> Date Analyzed 11/7/98 <br /> Instrument I D# GCHP17 <br /> Conc Spiked ug/L 250 <br /> LCS Recovery, ug/L 250 <br /> LCS % Recovery 100 <br /> Percent Recovery Control Limits <br /> MS/MSD 60-140 <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 /> interference the LCS recovery is to be used to validate the batch <br /> Tod Granicher <br /> Project Manager <br />