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I <br /> SC(1 L10k1 630 ilirakr I),lvr R-611(ld( 11y,( A 4)41W,1 (415) 164 9600 IAX (414) 164 41111 <br /> 4D4 404 N Wlget I aue Walnut(ieek C A 94598 (5111) 9811 96110 1A(51(1)988 0671 <br /> Analytical 819 Sinker Avenue Suitt a Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Geocon } Client project li7 305 S Hutchins Street v <br /> 3235 Sunrise Blvd , Suite 6 Matrix Water <br /> Rancho Cordova, CA 95742 <br /> ' Attention Flick Walls QC Sample Group 5071178-1;183 Reported Jul 31, 1995 v <br /> ' QUALITY CONTROL DATA REPORT <br /> ' <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> ' Method- EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst. C Lee C Lee C Lee C Lee <br /> Concentration <br /> Spiked. 10pg/L 10pg/L 10pg/L 30pg/L <br /> ' LCS Batch# LCS073195 LCS073195 LCS073195 LCS073195 <br /> Date Prepared 7/31/95 7/31/95 7/31/95 7/31/95 <br /> Date Analyzed' 7/31/95 7/31/95 7/31/95 7/31/95 <br /> Instrument I D #• GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> LCS <br /> Recovery 99 99 100 Too <br /> Control Limits: 75-125 75-125 75-125 755-125 <br /> MS/MSD <br /> Batch#: 5071195 5071195 5071195 $071195 <br /> Date Prepared- 7/31/95 7/31/95 7/31/95 7/31/95 <br />' Date Analyzed- 7/31/95 7/31/95 7/31/95 7/31/95 <br /> Instrument I D #: GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Matrix Spike <br />' % Recovery- <br /> 95 94 97 94 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery. 94 92 97 96 <br />' Relative% <br /> Difference: 1 1 22 001 '2 1 <br />' lease Note <br /> The LCS Is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL 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 /> arrd are not used to acts t or're ect batch results <br /> Janet H an <br /> Project Manager <br />' 5071178 GEC 43> <br /> r� <br />