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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9Z33 <br /> (D 404 N Wiget Lane Walnut Creek CA 94598 (9Z5)988-9600 FAX(925)988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)9Zf-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Gettler Ryan/Geostrategles Client Project ID Unocal 6981 140124 02 <br /> 3164 Gold Camp Drive, Ste 240 <br /> Rancho Cordova, CA 95670 <br /> Attention Steve Carter QC Sample Group 9807197 Reported Aug 18, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8020 <br /> Analyst A Mirattab <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch# GCO80198BTEX02A <br /> Sample No GW9807-DO9-03CMS <br /> Date Prepared 811198 811198 811198 8/1198 <br /> Date Analyzed 811198 811198 811198 8/1198 <br /> Instrument I D # GCHP02 GCHP02 GCHP02 GCHP02 <br /> Sample Cone ug1L N D N D N D N D <br /> Cone Spiked, ug/l. 10 10 10 30 <br /> Matrix Spike, uglL 11 10 10 31 <br /> % Recovery 110 100 100 103 <br /> . Matrix <br /> Spike Duplicate, uglL 10 9 5 9 4 28 <br /> % Recovery 100 95 94 93 <br /> Relative % Difference 95 5 1 6 2 10 <br /> RPD Control Limits 0-25 0-25 0-25 0-25 <br /> LCS Batch# GWLCS080198A <br /> Date Prepared 811198 811/98 811198 8/1198 <br /> Date Analyzed 811198 811198 811198 8/1198 <br /> Instrument I D # GCHP02 GCHP02 GCHP02 GCHP02 <br /> Cone Spiked uglL 10 10 10 30 <br /> LCS Recovery ug1L 10 98 9 7 30 <br /> LCS % Recovery 100 98 97 100 <br /> Percent Recovery Control Limits <br /> NISIMSD 60140 60140 60144 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 limits due to matrix <br /> interference the LCS recovery is to be used to validate the batch <br /> Tod Granlcher <br /> Project Manager <br />