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680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> 6) Sequoia 404 N Wig lane Walnut Creek CA 94598 (9Z5)988-9600 FAX(925)988-9673 <br /> � Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Gettler Ryan/Geostrategies Client Project ID Former Unocal SS #2859 <br /> '6747 Sierra Court, Ste J Matrix Liquid <br /> 'Dublin, CA 94568 <br /> Attention Deanna Harding Work Order# 9806C89 01-06 Reported Jul 23, 1998 <br /> 9806C90 07-10 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte' Benzene Toluene Ethyl Xylenes BTEX as TPH <br /> Benzene <br /> QC Batch#- GCO62998802002A GCO62998802002A GCO62998802002A GCO62998802002A GCO62998802002A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst- D Newcomb D Newcomb D Newcomb D Newcomb D Newcomb <br /> MS/MSD # 8061848 8061848 8061848 8061848 8061848 <br /> Sample Conc. N D N D N D N D N D <br /> Prepared Date- 6/29/98 6/29/98 6/29/98 6/29/98 6/29/98 <br /> Analyzed Date. 6/29/98 6/29/98 6/29/98 6/29/98 6/29/98 <br /> Instrument I D #, HP2 HP2 HP2 HP2 HP2 <br /> Conc Spiked 20pg/L 20Mg/L 20Ng/L 60pg/L 360 mg/L <br /> Result is 18 19 57 330 <br /> MS % Recovery- 90 90 95 95 92 <br /> Dup Result 18 18 18 57 320 <br /> MSD % Recov 90 90 90 95 89 <br /> RPD 00 00 54 00 31 <br /> RPD Limit. 0-20 0-20 0-20 0-20 0-50 <br /> LCS # LCS062998 LCS062998 LCS062998 LCS062998 LCS062998 <br /> Prepared Date 6/29/98 6/29/98 6/29/98 6/29/98 6/29/98 <br /> Analyzed Date: 6/29/98 6/29/98 6/29/98 6/29/98 6/29/98 <br /> Instrument I.D.# HP2 HP2 HP2 HP2 HP2 <br /> Conc. Spiked- 20Mg/L 20Kg/L 20Mg/L 60Mg/L 360Yg/L <br /> LCS Result: 17 17 17 54 320 <br /> LCS % Recov .. 85 85 85 90 89 <br /> LCS 70-130 70-130 70-130 70-130 60-140 <br /> Control Limits <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 /> *LAP#1271 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 *"MS-Matrix Spike,MSD=MS Duplicate,RPD-Relative%Difference 9SWC439 GET <2> <br />