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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX (415) 364 9233 <br /> Analytical 1900 Bates Avenue,Suite L Concord, CA 94520 (510) 686 9600 FAX (510)686 9689 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916) 921 0100 <br /> .EAM-West Client Project ID 1218 03, Safeway/Stockton <br /> 2001 P Street, Suite 200 Matrix Water <br /> Sacramento, CA 95814 <br /> Attention Bill Spong OC Sample Group 4070706-708 Reported Aug 3, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Diesel <br /> Method EPA 6015 Mod <br /> 1%,1311'st Cl1iara%ailct <br /> Concentration <br /> Spiked 300 ug/L <br /> LCS Batch# BLK071994 <br /> Date Prepared 7/19/94 <br /> Date Analyzed- 7/29/94 <br /> Instrument I D # HP313 <br /> LCS % <br /> . Recovery 80 <br /> Control Limits 60-130 <br /> MS/MSD <br /> Batch # BLK071994 <br /> Date Prepared 7/19/94 <br /> Date Analyzed 7/20/94 <br /> Instrument I D # HP313 <br /> Matrix Spike <br /> % Recovery 80 <br /> ------Matrix Spike - -- - -- ---- - ----- — --- - - - - - --- -- - ------- -- <br /> Duplicate% <br /> Recovery 87 <br /> Relative% <br /> Difference 84 <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 LCS%recovery data is 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 /> Linda C Schneider <br /> Project Manager 4070706 ERS <2> <br />