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r ' Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(4 IS) 364 9233 <br /> Analyt�eal 404 NWiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX (SIQ)988 9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> leinfelder Client Project ID 20-3769-01/C01 <br /> 2825 East Myrtle St Matrix Water <br /> Stockton, CA 95205 <br /> Attention Tony Martin QC Sample Group 5111357-60 Reported Nov 13, 1995 <br /> r <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method. EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: C Lee C Lee C Lee C Lee <br /> Concentration <br /> Spiked 10ug/L 10ug/L 10ug/L 30ug/L <br /> LCS Batch# LCS110695 LCS110695 LC8110695 LCS 110695 <br />' Date Prepared 11/6/95 11/6/95 11/6/95 11/6/95 <br /> Date Analyzed: 11/6/95 11/6/95 11/6/95 11/6/95 <br /> Instrument I D.# GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> LCS % i <br /> Recovery, 89 90 90 91 <br /> Control Limits 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch # 5101308 5101308 5101308 5101308 <br /> Date Prepared 11/6/95 11/6/95 11/6/95 11/6/95 <br /> Date Analyzed 11/6/95 11/6/95 11/6/95 11/6/95 <br /> Instrument I D # GCr;P-2 GCHP-2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> % Recovery. 89 91 91 91 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 90 90 91 91 <br />' Relative % <br /> Difference 1 1 1 1 00 00 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> 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 /> L1nda C Schneider and are not used to accept or refect batch results <br /> Project Manager <br />' 5101357 KLF <3> <br />