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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(5 10)988 9673 <br /> VQVAnalytical 819 Stnker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> groundwater Technology Client Project ID Chevron #9-1918, Stockton, CA <br /> 1401 Halyard Drive, Suite 140 Matrix Soil <br /> West Sacramento, CA 95691 <br /> Attention Jason Fedota QC Sample Group 5060445-47 Reported Jun 15, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> TCLP <br /> ANALYTE TCLP TCLP Ethyl- TCLP <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 20 ug/L 20 ug/L 20 ug/L 60 ug/L <br /> LCS Batch# LCS060995 LCS060995 LCS060995 LCS060995 <br /> Date Prepared 6/9/95 6/9/95 6/9/95 6/9/95 <br /> Date Analyzed 6/9/95 6/9/95 6/9/95 6/9/95 <br /> Instrument I D# GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> LCS% � <br /> Recovery 111 113 119 119 <br /> Control Limits 75-125 75 125 75-125 75 125 <br /> MS/MSD <br /> Batch# 5060362 5060362 5060362 5060362 <br /> Date Prepared 6/9/95 6/9/95 6/9/95 6/9/95 <br /> Date Analyzed 6/9/95 6/9/95 6/x/95 6/9/95 <br /> Instrument 1 D # GCHP-2 GCHP 2 GCHP-2 GCHP 2 <br /> Matrix Spike <br /> % Recovery 115 115 125 122 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 110 110 120 117 <br /> Relative% <br /> Difference 44 44 41 4 2 <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 Schneider and are not used to accept or reject batch results <br /> Project Manager <br /> 5060445 GRW ,�3> <br />