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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 /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921 9600 FAX(916)921-0100 <br /> IQF 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707)792-0342 <br /> 0 <br /> Gettler Ryan/Geostrategies 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 Miraftab <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch # GCO801 98BTEX03A <br /> Sample No GW9807-D09-03DMS <br /> Date Prepared 811198 8/1/98 811198 811/98 <br /> Date Analyzed 8/1/98 811/98 811/93 8/1198 <br /> Instrument I D # GCHP03 GCHP03 GCHP03 GCHP03 <br /> Sample Cone , ug/L N D N D N D N D <br /> Cont: Spiked ug1L 10 10 10 30 <br /> Matrix Spike uglL 11 11 11 34 <br /> % Recovery 110 110 110 113 <br /> Matrix <br /> Spike Duplicate ug/L 11 11 11 33 <br /> % Recovery 110 110 110 110 <br /> Relative % Difference 0 0 00 00 2 7 <br /> RPD Control Limits 0-25 0-25 0-25 0-25 <br /> LCS Batch# GWLCS080198A <br /> Date Prepared 811198 811/98 811198 8/1/98 <br /> Date Analyzed 811198 811198 8/11/98 811198 <br /> Instrument I D # GCHP03 GCHP03 GCHP03 GCHP03 <br /> Conc Spiked, ug/L 10 10 10 30 <br /> LCS Recovery, uglL 11 11 11 33 <br /> LCS % Recovery 110 110 110 110 <br /> Percent Recovery Control Limits <br /> MSIMSD 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 limits due to matrix <br /> interference the LCS recovery is to be used to validate the batch <br /> Tod Granicher <br /> Project Manager <br /> 'i <br />