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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Wainut Creek CA 94598 (510) 988 9600 FAX(510) 988 9673 <br /> v4gp- Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916) 921 0100 <br /> Pacific Environmental Group Client Project ID 920 122 1A/Chevron 9-9840 <br /> 11315 Sunrise Gold Circle, Ste M Matrix Sail <br /> Rancho Cordova, CA 95742 <br /> Attention Tim Anenson QC Sample Group 803-0557 Reported Mar 16, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE 1,1 Dichloro- Trlchloro Chloro- <br /> ethane ethene benzene <br /> Method EPA 8010 EPA 8010 EPA 8010 <br /> Analyst K Pocan K Pocan K Pocan <br /> Concentration <br /> Spiked 50 Ng/kg 50 jig/kg 50 ug/kg <br /> LCS Batch# VSBLK031398 VSBLK031398 VSBLK031398 <br /> BS-A BS-A BS-A <br /> Date Prepared 03/13/98 03/13/98 03/13/98 <br /> Date Analyzed 03/13/98 03/13/98 03/13/98 <br /> Instrument 1 D # GCHP09 GCHP09 GCHP09 <br /> LCS % <br /> Recovery 100 96 84 <br /> Control Limits 65-135% 70-130% 70-130% <br /> MS/MSD <br /> Batch# 9803389-05 9803389-05 9803389-05 <br /> Date Prepared 03/09/98 03/09/98 03/09/98 <br /> Date Analyzed 03/09/98 03/09/98 03/09/98 <br /> Instrument I D # GCHP09 GCHP09 GCHP09 <br /> Matrix Spike <br /> % Recovery 70 76 64 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 60 70 58 <br />' Relative% <br /> Difference 15 8 2 98 <br /> Please Note <br /> The LCS 1s a control sample of known interferent free matrix that is analyzed using the same reagents, <br /> SEQUOIA ANALYTI L preparation and analytical methods employed for the samples The LCS%recovery data 1s used for <br /> / validation of sample batch results Due to matrix effects,the QC limits for MS/MSD's are advisory only <br /> and are not used to accept or reject batch results <br /> Inda C Scf h elder C� <br /> Project Manager/Sacramento Laboratory <br /> 8030557 PES 4 3> <br />