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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> ea) 1900 Bates Avenue Suite L Concord CA 94520 (5 10) 686 9600 FAX (510)686 9689 <br /> w1,1 Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (9 16) 921 9600 FAX(916)921 0100 <br /> Fugro West, Inc Client Project ID Shell, 2575 Country Club, Stockton, CA <br /> 1050 Melody Lane, Ste 160 Matrix Soil <br /> Roseville, CA 95678 <br /> Attention Sudhakar Talanki OC Sample Group 5050331-340 Reported May 18, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method CPA 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#' LCS051695 LCS051695 LCS051695 LCS051695 <br /> Date Prepared 5/16/95 5/16/95 5/16/95 5/16/95 <br /> Date Analyzed 5/16/95 5/16/95 5/16/95 5/16/95 <br /> Instrument I D # GCHP-1 GCHP 1 GCHP-1 GCHP-1 <br /> LCS % <br /> Recovery 95 90 95 93 <br /> Control Limits 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch# 5050548 5050548 5050548 5050548 <br /> Date Prepared 5/16/95 5/16/95 5/16/95 5/16/95 <br /> Date Analyzed 5/15/95 5/16/95 5/16/95 5/16/95 <br /> Instrument i D # GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> Matrix Spike <br /> % Recovery- 80 80 85 85 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery- 95 90 95 95 <br /> Relative % <br /> Difference- 17 12 11 11 <br /> EOUOIA ANALYTICAL Please Note <br /> r The LCS is a control sample of known,mterferent free matrix that is analyzed using the same reagents, <br /> preparation and analytical methods employed for the samples The LCS%recovery data 1s used for <br /> validation of sample batch results Due to matrix effects,the CC limits for MS/MSDs are advisory only <br /> / t- <br /> Linda C Schneider and are not used to accept or reject batch results <br /> Project Manager 5050331 FUG <4> <br /> YJ <br />