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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9239 <br /> (5) 1900 Bates Avcnue Suite L Concord CA 94520 (510) 686 9600 FAX(510) 686 9689 <br /> %F Analytical 819 5tnker Avenuc Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916) 921 0100 <br />�Fugro West, Inc Client Project ID Shell, 2575 Country Club, Stockton, CA <br /> 1050 Melody Lane, Ste 1 E30 Matrix Sod <br /> Roseville, CA 95678 <br /> Attention Sudhakar Talanki CC Sample Group 5050331-340 Reported May 18, 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 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg <br /> LCS Batch# LCS051595 LCS051595 LCS051595 LCS051595 <br /> Date Prepared: 5/15/95 5/15/95 5/15/95 5/15/95 <br /> Date Analyzed 5/15/95 5/15/95 5/15/95 5/15/95 <br /> Instrument I D # GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> . LCS % <br /> Recovery 90 90 90 92 <br /> Control Limits 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch # 5050510 5050510 5050510 5050510 <br /> Date Prepared 5/15/95 5/15/95 5/15/95 5/15/95 <br /> Date Analyzed 5/15/95 5/15/95 5/15/95 5/15/95 <br /> Instrument LD # GCHP-i GCHP-1 GCHP-f GCHP-1 <br /> Matrix Spike <br /> % Recovery 85 85 85 90 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 85 85 90 92 <br /> Relative % <br /> Difference. 00 00 57 20 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LCS 1s a control sample of known,interferent free matrix that 1s analyzed using the same reagents, <br /> Zn' / preparation and analytical methods employed for the samples The LCS%recovery data 1s used for <br /> G �f t �7 validation of sample batch results Due to matrix effects,the QC limits for MS/MSD's are advisory only <br /> Linda C Schneider and are not used to accept or reject patch results <br /> Project Manager 5050331 FUG <5> <br />