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-Vr , Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 96W FAX(415) 364 9233 <br /> II,��••••��JJJ� 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Sinker Avenue Susie 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Pacific Environmental Group, Inc Client Project fD Arco 2093, Tracy, CA <br /> 11315 Sunrise Gold Circle, #M Matrix Water <br /> Rancho Cordova, CA 95712 <br /> Attention Greg Barclay QC Sample Group 6070838-51 Reported Jul 30, 1996 <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 8 Williams B Williams B Williams B Williams <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch# LCS072496 LCS072496 LCS072496 LCS072496 <br /> Date Prepared 07/24/96 07/24/96 07/24/96 07/24/96 <br /> Date Analyzed 07/24/96 07/24/96 07/24/96 07/24/96 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP-2 GCHP 2 <br /> LCS % <br /> Recovery 93 95 95 96 <br /> Control Limits 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch # 6070847 6070847 6070547 5070847 <br /> Date Prepared 07/24/96 07/24/96 07/24/96 07/24/96 <br /> Date Analyzed 07/24/96 07/24/96 07/24/96 07/24/96 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP-2 GCHP 2 <br /> Matrix Spike <br /> %Recovery 90 91 92 93 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 91 91 92 88 <br /> Relative % <br /> Difference 1 1 00 0 0 56 <br /> SEQUOIA <br /> 6 <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 /> fndra'CC; <br /> preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> �G �' c - validation of sample batch results Due to matrix effects the QC limits for MS/MSDs are advisory only <br /> LSchneider and are not used to accept or reject batch results <br /> Project Manager/Sacramento Laboratory <br /> 6070838 PES <7> <br />