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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 1900 Bates Avenue,Suite L Concord CA 94520 (510) 686 9600 FAX(510)686 9689 <br /> 4D— <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> 4IRM-West Client Project ID 1218 03 /Safeway Stockton <br /> 455 Capitol Mall, 8th Fir Matrix Water <br /> Sacramento, CA 95814 <br /> Attention Laurie Depies QC Sample Group 5031193-1194 Reported Apr 12, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Diesel Acenaphthene Phenanthrene Pyrene <br /> Method EPA 8015M EPA 8310 EPA 8310 EPA 8310 <br /> Analyst C Lee L Haar L Haar L Haar <br /> Concentration <br /> Spiked 300 ug/L. 1000 ug/L 250 ug/L 100 ug/L <br /> LCS Batch# LCSO40695 LCS032895 LCS032895 LCS032895 <br /> Date Prepared 4/6/95 3/28/95 3/28/95 3/28/95 <br /> Date Analyzed 4/11/95 3/29/95 3/29/95 3/29/95 <br /> Instrument I D # GCHP-3B GCw 1 GCW 1 GCW 1 <br /> LCS % <br /> Recovery 97 99 64 96 <br /> Control Limits 60-130 50-150 50-150 50-150 <br /> MS/MSD a <br /> Batch # BLK040695 BLK032895 BLK032895 BLK032895 <br /> Date Prepared 4/6/95 3/28/95 3/28/95 3/28/95 <br /> Date Analyzed 4/11/95 3/29/95 3/29/95 3/29/95 <br /> Instrument I D # GCHP-36 GCW 1 GCW 1 GCW 1 <br /> Matrix Spike <br /> % Recovery 97 99 64 96 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 100 96 60 92 <br /> Relative% <br /> Difference 30 31 65 43 <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 CC limits for MS/M5D's are advisory only <br /> and are not used to accept or reject batch results <br /> Linda C Schneider <br /> Project Manager <br /> 5031193 ERS <5> <br />