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. . , Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (415) 364 9600 FAX (415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek C4 94598 (510) 988 9600 FAX(51��� <04 N Wiget Lsne Walnut Creek C4 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical a 19 Striker Avenue Suitc 8 Sacramento CA 95834 (916) 921 9600 FAX(916)92t 0too <br /> • Pacrftc Enviro'Ahiental Group, Inc Client Project 11) 02133, Stockton, CA <br /> 11315 Sunrise Gold Circle, #M Matrix Water <br /> { Rancho Cordova, CA 95742 <br /> Attention Rusty Benkosky QC Sample Group 8120181-90 Reported Dec 17, 1996 <br /> n K K<Yi <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 6020 <br /> Analyst B 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# LCS121096 LCS121096 LCS121096 LCS121096 <br /> Date Prepared 12/10/96 12/10/96 12/10/96 12/10/96 <br /> Date Analyzed 12/10/96 12/10/96 12/10/96 12/10/96 <br /> Instrument LD #• GCHP-2 GCHP 2 GCHP 2 GCHP 2 <br /> LCS % <br /> Recovery 101 103 104 104 <br /> Control Limits 70.130 70-130 70-130 70-130 <br /> MS/MSD <br /> Batch # 6120271 6120271 6120271 6120271 <br /> Date Prepared: 12/10/96 12/10/96 12/10/96 12/10/96 <br /> Date Analyzed 12/10/96 12/10/96 12/10/96 12/10/96 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP 2 GCHP 2 <br /> Matrix Spike <br /> % Recovery. 96 98 99 97 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 99 102 102 101 <br /> Relative % <br /> Difference 3 1 40 3 0 4 0 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LCS is a control sample of known interferent tree matrix that is analyzed i <br /> p yz using the same reagents <br /> preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> 7LZirnda <br /> validation of sample batch results Due to matrix effects the QC limits for MS/MSDs are advisory only <br /> C Schneider and are not used to accept or reject batch results <br /> ject Manager/Sacramento Laboratory <br /> 6120181 PES <6> <br />