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[ ` t Sequoia 680 Chesapeake Dnvc Redwood Cary CA 94063 (415) 364 9600 FAX(415)364 9233 <br /> 404 N Wiget Lane Walnut Creek,CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> VAO Analytical 8t9 Stnker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> roundvv tefTech n l ' ,r j t - A t-� <br /> 0 ogy 'Client Project�ID'� h`Chevran#J-1918,`StocjCtyon,`CA�` <br /> M401 Halyard Drive, Suite 144 Matra( Sod <br /> West Sacramento, CA 95691 <br /> Attention Jason Fedota OC Sample Group 5460371-379 Reported <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 JF AT MC JF AT MC JF AT MC JF AT MC <br /> Concentration <br /> Spiked 20pg/L 20M91 20F+g/L 60ug/L <br /> LCS Batch# LC8060895 LCS060895 LCS060895 LCS060895 <br /> Date Prepared, 6/8/95 6/8/95 6/8/95 6/8/95 <br /> Date Analyzed 6/8/95 6/8/95 6/8/95 6/8/95 <br /> Instrument I.D #. GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> LCS % <br /> Recovery* 112 111 118 119 <br /> Control Limits 71-133 72-128 72-130 71-120 <br /> MS/MSD <br /> Batch# 5060632 5060632 5060632 5060632 <br /> Date Prepared 6/8/95 6/8/95 6/8/95 6/8/95 <br /> Date Analyzed 6/8/95 6/8/95 6/8/95 6/8/95 <br /> Instrument I.D # GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Matnx Spike <br /> %Recovery 115 115 115 118 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 120 120 125 122 <br /> Relative% <br /> Difference 4 3 4 3 83 3 3 <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/MSDs are advisory only <br /> Linda C chnelder and are not used to accept or reject batch results <br /> Project Manager <br /> 5060371 GRW <3> <br />