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f . , 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)989 9673 <br /> Analytical 819 Stinker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> 141einfelder 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 /> 1 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes Diesel <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M <br /> Analyst B Williams B Williams 8 Williams B Williams C Lee <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L 300 ug/L <br />' LCS Batch# LGS110795 LCS110795 LCS110795 LCS110795 LCS110295A <br />' Date Prepared 11/7/95 11/7/95 11/7/95 11/7/95 11/2/95 <br /> Date Analyzed 11/7/95 11/7/95 11/7/95 11/7/95 11/2/95 <br /> Instrument 1.13#' GCHP-2 GCHP-2 GCHP-2 GCHP-2 GCHP-38 <br /> LCS °.6 <br /> Recovery 88 88 89 89 72 <br /> Control Limits 75-125 75-125 75-125 75-125 60-130 <br />' MS/MSD <br /> Batch #' 5110068 5110068 5110068 5110068 BS110295A <br />' Date Prepared. 11/7/95 11/7/95 11/7/95 11/7/95 11/2/95 <br /> Date Analyzed 11/7/95 11/7/95 11/7/95 11/7/95 11/2/95 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP-2 GCHP-2 GCHP-3B <br />' Matrix Spike <br /> % Recovery- 81 81 84 83 72 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 83 84 85 87 58 <br /> Relative % <br /> Difference 24 36 12 47 22 <br /> EQUOIA 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 OC limits for MS/MSD's are advisory only <br /> Linda C Schneider and are not used to accept or reject batch results <br /> Project Manager <br /> 5101357 KLF <4> <br /> � r <br />