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til � <br /> Sequoia Sae Chesapeake Drive Redwood City A 9,4063 ,550) 1MI-9600 FAX 1650)364-9233 <br /> 404 N ".1 Lane Walnut Creep G 94598 (925)988-9600 FAX(42S)988 9673 <br /> 819 Sinker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(416)921-0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-I S65 FAX(707)792-0342 <br /> Gettler RyanlGeostrategies Client Project ID Unocal SS#0123 <br /> 6747 Sierra Court, Ste J <br /> Dublin, CA 94568 <br /> Attention Deanna Harding QC Sample Group 9809HSO Reported Nov 25, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8020 <br /> Analyst NC <br /> ANALYTE Benzene Toluene Ethylbenzene Xyienes <br /> aC Batch # GC 100698STEX21 A <br /> Sample No GW9809F39-9 <br /> Date Prepareu 1016198 1+016198 1016198 1018198 <br /> Date Analyzed 1016198 1016198 1016198 1016198 <br /> Instrument I D # GCHP21_ GCHP21 GCHP21 GCHP21 <br /> Sample Conc , uglL N D N D N D N D <br /> Conc Spiked, ug1L 10 10 10 30 <br /> Matrix Spilka. ug1L 12 12 11 34 <br /> % Recovery 120 120 110 113 <br /> . Matrix <br /> Spike Duplicate uglL 12 12 12 34 <br /> % Recovery 120 120 120 113 <br /> Relative % Difference 0 0 0 0 8 7 00 <br /> RPD Control Limits 0-25 0-25 0-25 0-25 <br /> LCS Batch# GWLCS100698A <br /> Date Prepared 1016198 1016198 1016198 1016198 <br /> Date Analyzed 1016198 1016198 1016198 1016198 <br /> Instrument I D # GCHP21 GCHP21 GCHP21 GCHP21 <br /> Conc Spiked uglL 10 10 10 30 <br /> LCS Recovery u91L 11 11 11 34 <br /> LCS % Recovery 110 110 110 113 <br /> Percent Recovery Control Limits <br /> F- <br /> IVISiMSI) 60-140 60140 60 140 60140 <br /> LCS 70-130 70130 70130 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 is an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> .q 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 /> T <br />