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Sequoia 690 Chesapeake Drive Redwc;lod City,CA 94063 (415) 364-9600 FAX(415) 364-9233 <br /> 104 N.Wig,t Lane Walnut Creek,CA 94598 (5 10) 989.9600 FAX(510)988-9673 <br /> Analytical 8 t 9 Striker Avenue,Suite 8 Sacra M'cnto, CA 95834 (916) 921-9600 FAX(916)931-0100 <br /> 6 <br /> ..acHiC Environmental GroUp, 1nc. Client roject ID: ArC6 2093, CA . . <br /> 11315 Sunrise Gold Circle, #M Matrix: Water <br /> f <br /> Rancho Cordova, CA 95742 <br /> Attention: Greg Barclay QC Sample Group 6020578-059or Reported: Feb 21 <br /> 1996 <br /> 4 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- it <br /> Benzene Toluene Benzene I- Xyleries <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: C.Lee G. Lee C.Lee C.Lee <br /> Concentration <br /> Spiked: 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch#: LCS022096 LCS022096 LCS022096 'LCS022096 <br /> Date Prepared: 02/20/96 02/20/96 02/20/96 02/20/96 <br /> Date Analyzed: 02/20/96 02/20/96 02/20/96 02/20/96 <br /> Instrument J.D.#: GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> LCS % <br /> Recovery: 85 86 92 92 <br /> Control Limits: 75-125 75-125 75-126 75.125 <br /> ........... <br /> MS/MSD <br /> Batch #: BS0220% BS022096 BS022096 'BS022096 <br /> Date Prepared: 02/20/96 02/20/96 02/20/96 -02/20/96 <br /> Date Analyzed: 02/20/96 02/20/96 02/20/96 .92/20/96 <br /> Instrument I.D.#: GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> % Recovery* 92 93 94 94 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 88 89 93 93 <br /> Relative% <br /> Difference: 4.4 4.4 <br /> i. <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 OC limits for MS/MSO's are advisory only <br /> Janet Han and are not used to accept or reject batch iesults. <br /> Project Manager/Sacramento Laboratory <br /> 6020578.PES <7> <br />