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Sequoia 6aO Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N Wlget 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-otoo <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Gettler Ryan/Geostrategles Client Project ID Former Unocal Facility #5098 <br /> 6747 Sierra Court, Ste J <br /> Dublin, CA 94568 <br /> Attention Deanna Harding QC Sample Group 9809909 Reported Oct 8, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matnx Liquid <br /> Method EPA 801018020, 6011602 <br /> Analyst C Medina <br /> ANALYTE 1 1-DCE TCE Chlorobenzene Benzene Toluene Chlorobenzene <br /> QC Batch # GC0927980VOA295 <br /> Sample No 9809909-02 <br /> Date Prepared 9127198 9127/98 9127198 9127198 9/27/98 9127198 <br /> Date Analyzed 9128198 9128/98 9128198 9128198 9128198 9128198 <br /> Instrument I D # GCHP29 GCHP29 GCHP29 GCHP29 GCHP29 GCHP29 <br /> Sample Conc , ug/L N D N D N D N D N D N D <br /> Conc Spiked, ug/L 25 25 25 25 25 25 <br /> Matrix Spike, ug/L 15 17 19 20 20 22 <br /> % Recovery 60 68 76 80 80 88 <br /> Matrix <br /> Spike Duplicate ug/L 15 17 19 21 20 23 <br /> % Recovery 60 68 76 84 80 92 <br /> Relative % Difference 00 00 00 49 00 44 <br /> RPD Control Limits 0-50 0-50 0-50 0-50 0-50 0-50 <br /> LCS Batch# VWLCS092798A <br /> Date Prepared 9127198 9/27198 9127198 9/27198 9127198 9127198 <br /> Date Analyzed 9127198 9/27198 9127198 9/27198 9127/98 9/27198 <br /> Instrument I D # gchp 29 gchp 29 gchp 29 gchp 29 gchp 29 gchp 29 <br /> Conc Spiked ug/L 25 25 25 25 25 25 <br /> Recovery, ug/L 20 19 19 23 23 24 <br /> LCS % Recovery 80 76 76 92 92 96 <br /> Percent Recovery Control Limits <br /> MS/MSD 60140 60140 60140 60140 60-140 60-140 <br /> LCS 65135 70130 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 /> 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 /> Tod Granicher interference the LCS recovery is to be used to validate the batch <br /> Project Manager <br />