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~ Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364 9600 FAX(650)364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (925)988 9600 FAX(925)988-9673 <br /> 819 5mker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> Analytical <br /> 1455 McDowell Blvd North Ste D Petaluma CA 94954 707 792 1865 FAX 707)792-0342 <br /> i <br /> Gettler Ryan/Geostragegies Client Project 1D Unocal 6981, Stockton <br /> 6747 Sierra Court, Ste J <br /> Dublin, CA 94568 <br /> Attention Steve Carter QC Sample Group 9808H51 Reported Sep 16, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> j Method EPA 8020 <br /> Analyst A M <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch # GCO82998BTEX03A <br /> Sample No GW9808E17-08 <br /> Date Prepared 8129198 8129198 8129198 8129198 <br /> Date Analyzed 8129198 8129198 8129198 8129198 <br /> Instrument I D # GCHP03 GCHP03 GCHP03 GCHP03 <br /> Sample Conc ug/L N D N D N D N D <br /> Conc Spiked, ug1L 10 10 10 30 <br /> Matrix Spike, ug1L 10 97 96 30 <br /> % Recovery 100 97 96 100 <br /> . Matrix <br /> Spike Duplicate, ug/L 10 10 10 31 <br /> % Recovery 100 100 100 103 <br /> Relative % Difference 00 3 0 4 1 3 0 <br /> RPD Control Limits 0-25 0-25 0-25 025 <br /> LCS Batch# GWLCS082998A <br /> Date Prepared 8129198 8129198 8129198 8129198 <br /> Date Analyzed 8129198 8129198 8129198 8129198 <br /> Instrument I D # GCHP03 GCHP03 GCHP03 GCHP03 <br /> Conc Spiked, ug1L 10 10 10 30 <br /> LCS Recovery, ug1L 9 8 9 6 96 30 <br /> LCS % Recovery 98 96 96 100 <br /> Percent Recovery Control Limits <br /> MS/MSD 60140 60140 60140 60140 <br /> LCS 70130 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 /> EQUOIA 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 limas due to matrix <br /> l` interference the LCS recovery is to be used to validate the batch <br /> Tod Granlcher <br /> Project Manager <br />