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Sequoia 680 Chesapeake Drive Redwood City,Ca 94063 (415) 364-9600 FAX (415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX (510)988 9673 <br /> Iwo- Analytical 819 Striker Avenue,Suite 8 Sacramento, CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> Blame Tech Services, Inc Client Project ID Shell Stockton / 961025-H2 <br /> 985 Timothy Drive Matrix Liquid <br /> San Jose, CA 95133 <br /> Attention Jim Keller Work Order# 961 OH38-02 Reported Nov 8, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> OC Batch# GC102996BTEX01A GC102996BTEX01A GC102996BTEX01A GC102996BTEXOIA <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst R Geckler R Geckler R Geckler R Geckler <br /> MS/MSD # 961OB9103 961069103 961089103 961069103 <br /> Sample Conc N D N D N D N D <br /> Prepared Date 10/29/96 10/29/96 10/29/96 10/29/96 <br /> Analyzed Date 10/29/96 10/29/96 10/29/96 10/29/96 <br /> Instrument I D # GCHPI GCHP1 GCHP1 GCHP1 <br /> Conc Spiked 10 pg/L 10 pg/L 10 pg/L, 30 Yg/L <br /> Result 78 70 81 22 <br /> MS % Recovery 78 70 81 73 <br /> Dup Result 96 98 11 30 <br /> MSD % Recov 96 98 110 100 <br /> RPD 21 33 30 31 <br /> RPD Limit 0-25 025 0-25 0-25 <br /> LCS # BLK102996 BLK102996 BLK102996 ELK102996 <br /> Prepared Date 10/29/96 10/29/96 10/29/96 10/29/96 <br /> Analyzed Date 10/29/96 10/29/96 10/29/96 10/29/96 <br /> Instrument I D # GCHPI GCHP1 GCHP1 GCHP1 <br /> Conc Spiked 10 pg/L 10lrg/L 10 pg/L 30 ug/L <br /> LCS Result 10 10 11 31 <br /> LCS % Recov 100 100 110 103 <br /> MS/MSD 60-140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 70-130 70-130 <br /> Control Limits <br /> Please Nate <br /> The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents <br /> S OIA NALYTICAL 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 enure analytical procedure If <br /> 101 the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> terference,the LCS recovery is to be used to validate the batch <br /> P gy nner <br /> Pr Iect anager ""MS=Matrix Spike MSD=MS Duplicate RPD=Relahve % Difference 9610H38 BtA �2> <br />