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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364-9600 FAX(415) 364-9233 <br /> a} 404 N Wiget[ane Walnut Creek,CA 94598 (510) 988-9600 FAX(510)988 9673 <br /> Analytical 819 Sinker Avenue,Suite 8 Sacramento,CA 95834 (916) 921-9600 FAX(M)921 0100 <br /> wnAh r <br /> gro West, Inc Client Project Ili Shell, 6131 Pacik A4 a",Stockton, CA <br /> 050 Melody Lane, Ste 160 Matrix Water <br /> Roseville, CA 95678 <br /> Attention Will Shipp QC Sample Group 5091325-1328 Reported Oct 6, 1995 <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 C Chapman C Chapman C Chapman C Chapman <br /> Concentration <br /> Spiked: 10 mg/L 10 mg/L 10 mg/L 30 mg/L <br /> LCIS Batch#: LCS100595 LCS100595 LCS100595 LCS100595 <br /> Date Prepared. 10/5/95 10/5/95 10/5/95 10/5/95 <br /> Date Analyzed: 10/5/95 10/5/95 10/5/95 10/5/95 <br /> Instrument I.D.#: GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> LCS % <br /> Recovery: 104 102 103 102 <br /> Control Limits: 75-125 75-125 75-125 75-125 <br /> v .w , ,A�,,:,ww A ~ ,,., , ,vA , ~V,.,vA�.wxs�, �n; Ar , w•� ..�~ v.�;u{an,uxY ..-,,, � , n .� ,vt a , ,nwn�w n„ ,..� , <br /> MS/MSD <br /> Batch#: BS100595 BS100595 BS100595 B8100595 <br /> Date Prepared: 10/5/95 10/5/95 10/5/95 10/5/95 <br /> Date Analyzed: 10/5/95 10/5/95 10/5/95 10/5/95 <br /> Instrument I D.#' GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> % Recovery: 102 100 103 103 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery g4 94 96 93 <br /> Relative% <br /> Difference: 82 62 70 10 <br /> SEQUOIA ANALYTICAL Please Note <br /> J The LCS is a control sample of known,Interferent free matrix that is analyzed using the same reagents, <br /> " /�� � f preparation and analytical methods employed for the samples The LCS%recovery data Is used far <br /> validation o1 sample batch results Due to matrix effects,the OC limits for MS/MSD's are advasory only <br /> Linda C Schneider and are not used to accept or reject batch results <br /> Project Manager <br /> 5091325 FUG <4> <br />