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Sequoia <br /> 680 Chesapeake Drive Redwood City CA 94063 650) 364-9600 FAY.16501 364-9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAA(925)988-9673 <br /> 819 Striker Avenue Suite B Sacramento CA 95834 (916)921-9600 FAX(9161921-0100 <br /> %07Analytical 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707) 792-1865 FAX(707)792-0342 <br /> Gettler R an Geostrate les Client Project ID Unocal SS#0123 <br /> Y / 9 1 <br /> 6747 Sterra 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-Dichioroethene Trichloroethene Benzene Toluene Chloro- <br /> benzene <br /> QC Batch#. MS092898826OF3A MS0928988260F3A MS0928988260F3A MS0928988260F3A MSOWW88260F31A <br /> Analy. Method: EPA 8260 EPA 8260 EPA 8260 EPA 8260 EPA 8,260 <br /> Prep Method- <br /> Analyst: L Duong L Duong L Duong L Duong L Duong <br /> MS/MSD # 980968006 9809BBM6 980988006 980888006 980988006 <br /> Sample Conc . N D N D N D N D N D <br /> Prepared Date. NA. 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 50pg/L 50pg/L 50pg/L 50pg/L <br /> Result: 49 48 51 48 50 <br /> MS % Recovery 98 96 102 96 100 <br /> Dup Result: 48 47 49 47 aS <br /> 101 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 LCS'00298 <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 F3 <br /> Conc Spiked 50 pg/L 50 pg/L 50 pg/L 50 pg/L 50 pg/L <br /> LCS Result 48 49 51 50 51 <br /> LCS % Recov 96 98 102 100 102 <br /> 60-140 60-140 60-140 60-140 60-140 <br /> LCS 65-135 70-130 70-130 70-130 70-130 <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 Granicher "*MS=Matrix Spike, MSD=MS Duplicate, RPE)=Relative% Difference <br /> Project Manager 98091-150 GET <1> <br />