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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-%00 FAX(650)364-9233 <br /> 1 404 N Wiget lane Walnut Creek,CA 94598 (9Z5)988-9600 FAX(925)988-9673 <br /> (D_ Analytical gig 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/Geostrategles Client Project ID Unocal SS#0123 <br /> 6747 Sierra Court, Ste J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding Work Order# 9809H50 01-05 Reported Oct 20, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte 1,1 Dichloroethene Trichloroethene Benzene Toluene Chloro- <br /> benzene <br /> QC Batch# MS0928988260F3A MS0928988260F3A MS0928988260F3A MS0928988260F3A MS0928988260F3A <br /> Analy Method EPA 8260 EPA 8260 EPA 8260 EPA 8260 BPA 8260 <br /> Prep Method <br /> Analyst L Duong L Duong L Duong L Duong L Duong <br /> MS/MSD # 9809B8006 980988006 980968006 9809B8006 980988006 <br /> Sample Conc N D N D N D N D N D <br /> Prepared Date N A N A N A N A N A. <br /> Analyzed Date 9/28/98 9/28/98 9/28/98 9/28/98 9/28/98 <br /> Instrument I D # F3 F3 F3 F3 F3 <br /> Conc Spiked 50pg/L 50ug/L 50,ug/L 50Vg/L 50pg/L <br /> Result 49 48 51 48 50 <br /> MS % Recovery 98 96 102 96 100 <br /> 01Dup Result- 48 47 49 47 48 <br /> MSD % Recov 96 94 98 94 96 <br /> RPD 21 21 40 21 41 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> LCS # LCS100298 LCS100298 LCS100298 LCS100298 LCSlD0298 <br /> Prepared Date 10/2/98 10/2/98 10/2/98 10/2/98 10/2/98 <br /> Analyzed Date. 10/2/98 10/2/98 10/2/98 10/2/98 10/2/98 <br /> Instrument I D # F3 F3 F3 F3 1=3 <br /> Conc. Spiked 50ug/L 50pg/L 50ug/L 50pg/L 50pg/L <br /> LCS Result 48 49 51 50 51 <br /> LCS % Recov 96 98 102 100 102 <br /> 60-140 60-140 50-140 60-140 60 140 <br /> LCS 65-135 70.130 70-130 70-130 70130 <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 /> 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 /> interference,the LCS recovery Is to be used to validate the batch <br /> Tod Grarllcher *"NIS=Matrix Spike, MSD=MS Duplicate, RPD=Relative% Difference <br /> Project Manager 9809H50 GET t 1> <br />