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Sequoia 69C Chesapeake Drive Redwood City CA 94063 650) 364-9600 FAX(650)364 9233 <br /> 404 N Wlget Lane Walnut Creep CA 94598 +9z5)988-9600 FAX(925)988 9673 <br /> BI95triker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921 0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (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 /> Matnx Liquid <br /> Method EPA 8020 <br /> Analyst NC <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch 9 GC100698BTEX21A <br /> Sample No GW9809F39-9 <br /> Date Prepared 1016198 1018198 1 G/6198 1016198 <br /> Date Analyzed 1016198 1016198 1016!98 10/6198 <br /> Instrument 1 D # GCHP21 GCHP21 GCHP21 GCHP21 <br /> Sample Conc , ug/L N D N D N D N 0 <br /> Conc Spiked, ug1L 10 10 10 30 <br /> Matrix Spike, ug/L. 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 00 0 0 87 0 0 <br /> RPD Control Limits 0-25 0-25 0-25 0-25 <br /> LCS Batch# GWLCS100698A <br /> Date Prepared 1016198 1016198 1016/98 1016198 <br /> Date Analyzed 10!6198 1016198 1016198 10/6!98 <br /> Instrument I D # GCHP21 GCHP21 GCHP21 GCHP21 <br /> Conc Spiked ug1L 10 10 10 30 <br /> LCS Recovery ug1L 11 11 11 34 <br /> LCS % Recovery 110 110 110 113 <br /> Percent Recovery Control Limits <br /> MSiMSO 60 140 60140 60140 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 /> 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 />