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• Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364-9233 <br /> 404 N 11Usget lane Walnut Creek CA 94598 (915)988-9600 FAX(925)988-9673 <br /> 819 Striker 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)79Z-0342 <br /> Gettler Ryan/Geostragegles Client Project ID Unocal 6981, Stockton <br /> 6747 Sierra Court, Ste J <br /> Dublin, CA 94568 <br /> Attention Steve Carter QC Sample Group 98081-151 Reported Sep 16, 1998 <br /> I <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8020 <br /> Analyst A M <br /> I <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> 4C Batch # GCO82998BTEX30A <br /> Sample No GW9808E17-12 <br /> Date Prepared 8129198 8129198 8129198 8/29198 <br /> Date Analyzed 8/29198 8129198 8129198 8129/98 <br /> instrument I D # GCHP30 GCHP30 GCHP30 GCHP30 <br /> Sample Cont: ug/L N D N D N D N D <br /> Cone Spiked, ug/L 10 10 10 30 <br /> Matrix Spike, ug/L 11 11 11 32 <br /> % Recovery 110 110 110 107 <br /> • Matrix <br /> Spike Duplicate ug/L 11 10 10 31 <br /> % Recovery 110 100 100 103 <br /> Relative % Difference 00 9 5 9 5 3 8 <br /> RPD Control Limits 0-25 0-25 0-25 0-25 <br /> LCS Batch# GWLCS082998A <br /> Date Prepared 8129/98 8129/98 8129198 8129198 <br /> Date Analyzed 8129198 8129198 8129198 8129198 <br /> Instrument I D # GCHP30 GCHP30 GCHP30 GCHP30 <br /> Cone Spiked ug1L 10 10 10 30 <br /> LCS Recovery ug1L 9 3 9 1 9 2 27 <br /> LCS % Recovery 93 91 92 90 <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 /> 41EQUOIA 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 />