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Sequoia 680 Chesapeake <br /> peake Dave Redwood Gry,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> Ana ytieal 1900 Bates Avenue Suite L Concord,CA 94520 (510) 686-%00 FAX(510)686 9689 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> %blugro West, Inc Client Project 1D Shell, 4316 Waterfoo Rd , Stockton, CA <br /> ' 1050 Melody Lane, Ste 160 Matrix Soil <br /> Roseville, CA 95678 <br /> Attention Kurt Martin OC Sample Goup 4120378-383 Reported Dec 22, 1994 <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 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg <br />' LCS Batch# LCS121994 LCS121994 LCS121994 LCS121994 <br />' Date Prepared. 12/19/94 12/19/94 12/19/94 12/19/94 <br /> Date Analyzed* 12/19/94 12/19/94 12/19/94 12/19/94 <br /> Instrument I D # GCHP-1 GCHP-1 GCHP-1 GCHP 1 <br /> MLCS <br /> Recovery as as as 85 <br /> 1 Control Limits 75-125 75-125 75-125 75-125 <br />' MS/MSD <br /> Batch # BLK121994 BLK121994 BLK121994 BLK121994 <br />' Date Prepared 12/19/94 12/19/94 12/19/94 12/19/94 <br /> Date Analyzed' 12/19/94 12/19/94 12/19/94 12/19/94 <br /> Instrument I D # GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br />' Matrix Spike <br /> % Recovery 95 100 100 100 <br />' Matrix Spike <br /> Duplicate% <br /> Recovery 85 90 90 93 <br /> Relative% <br /> Difference 11 10 10 83 <br /> SEQUOIA ANALYTICAL please Note <br /> The LCS is a control sample of known interferent tree matrtx 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 QC lkmds for MS/MSD's are advisory only <br /> Linda C Schneider I and are not used to accept or reject batch results <br /> Project Manager <br /> 4120378 FUG <2> <br />