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t( ■ , Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> yyyV�� 404 N Wiget Lane Walnut Creek 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 />•, l=ugro West, Inc Client Prolect IDA Shell, 1441 N 5i Dorado, Stocktori, CA <br /> 1050 Melody Lane, Ste 160 Matrix Air <br /> Roseville, CA 95678 <br /> Attention Sudhakar Talankl QC Sample Group 5070004-5 Reported Jul 13, 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 Lee C Lee C Lee C Lee <br /> Concentration <br /> Spiked. 2 0 m9/m3 2 0 mg/m3 2 0 mg/m3 6 0 mg/ms <br /> LCS Batch# LCS070695 LCS070695 LCS070695 LCS070695 <br /> Date Prepared 7/6/95 7/6/95 7/6/95 7/6/95 <br /> Date Analyzed* 7/6/95 7/6/95 7/6/95 7/6/95 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> LCS % <br /> Recovery 92 92 91 92 <br /> Control Limits: 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch # SS070695 BS070695 88070695 BS070695 <br /> Date Prepared 7/6/95 7/6/95 7/6/95 7/6/95 <br /> Date Analyzed 7/6/95 7/6/95 7/6/95 7/6/95 <br /> Instrument LD #- GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> % Recovery- 92 92 91 92 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery: 93 94 92 93 <br /> Relative % <br /> Difference. 1 1 22 1 1 11 <br /> SEQUOIA ANALYTICALPlease Note <br /> / The LCS is a control sample of known,Interferent free matrix that is analyzed using the same reagents, <br /> TLinda <br /> fffj / � ; .Z0 preparation and analytical methods employed for the sampies The LCS 96 recovery data,s used for <br /> validation of sample batch results Due to matrix effects,the CC limits for MS/MSDs are advisory only <br /> 7/ C Schneider and are not used to accept or reject batch results <br /> ✓ <br /> Project Manager <br /> 5070004 FUG <2> <br />