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Sequoia oso Chesapeake Drive Redwood Ctry Ca 94063 14(5] 364 9600 FAX(415) 364 9233 <br /> 4164 N Wtget Lane Walnut Creek CA 94598 �101 948 9600 1 4X(5 10)938 9,573 <br /> Analytical 819 ytreker Avenue Suite 8 ')aeramcrito (A 95834 716) 921 9600 FAX (9161 921 0100 <br /> Grown & Caldwell Client Project ID Arco 2133-95-5 Stockton <br /> 9616 Micron Ave Suite 600 Matrix Air/Water <br /> Sacramento CA 95827 <br /> Attention Steve Misner OC Sample Group 5110995-97 Reported Dec 6 1995 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 6020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst C Chapman C Chapman C Chapman C Chapman <br /> Concentration <br /> Spiked 10 u9/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch# LCS112695 LCS112695 LCS112695 LCS112695 <br /> Date Prepared 11/26/95 11/26/95 11/26/95 11/26/95 <br /> Date Analyzed 11/26/95 11/26/95 11/26/95 11/26/95 <br /> Instrument I D # GCHP-1 GCHP 1 GCHP-1 GCHP-1 <br /> LCS % <br /> . Recovery 92 115 113 111 <br /> Control Limits 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch #. 5111148 5111148 5111148 5111148 <br /> Date Prepared: 11/26/95 11/26/95 1'/26/95 11/26/95 <br /> Date Analyzed: 11/26/95 11/26/95 11/26/95 11/26/95 <br /> Instrument I.D.# GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> Matrix Spike <br /> % Recovery: 78 99 97 97 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery- 84 106 103 103 <br /> Relative% <br /> Difference: 74 68 so 60 <br /> SEQUOIA ANALYTICAL. Please Note <br /> The LCS is a control sample of known,interferent free matrix that 1s analyzed using the same reagents, <br /> � [I <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 /> Janeteanagger <br /> and are not used to accept or reject batch results <br /> Proje <br /> 5110995 8RS <6> <br />