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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 Creels CA 94598 (510) 988-9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921-9600 FAX(916) 921 0100 <br /> Fugro Vilest, Inc 'Client Project` Ib A Shefl,'7700 Moreland Court, Stockton,`CA <br /> 1050 Melody Lane, Ste 160 Matrix Sod <br /> Roseville, CA 95678 <br /> Attention Will Shipp QC Sample Group 5091345-7, 49,54-5, 58-9, 62-3 Reported Oct 9, 1995 , <br /> .. v ♦ in ,. ,, " .. r ` .. "' � .. ,. F 2 • t w r ,- it t ..[ <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. V Owens V Owens V Owens V Owens <br /> Concentration <br /> Spiked. 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg <br /> LCS Batch#• 1-CS100595 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-1 GCHP-1 GCHP-1 GCHP-1 <br /> LCS % <br /> Recovery' 100 99 98 98 <br /> Control Limits. 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch#' 5091195 5091195 5091195 5091195 <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-1 GCHP-1 GCHP-1 GCHP-1 <br /> Matrix Spike <br /> % Recovery 85 86 87 89 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 96 97 97 98 <br /> Relative % <br /> Difference. 12 12 11 96 <br /> • SEQUOIA ANALYTICAL Please Note <br /> The LCS 1s a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> I / preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> '?C L ������1• validation of sample batch results Due to matrix effects,the QC limits for MS/MSD's are advisory only <br /> LiSchneider and are not used to accept or reject batch results <br /> Protect Manager <br /> 5091345 FUG <6> <br /> r�i <br />