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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 986 9600 FAX (510) 988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916) 921 0100 <br /> qlcp <br /> Enviros, Inc Client Project ID Shell, 620 Charter Way, Stockton, CA <br /> P O Box 259 Matrix Air <br /> Sonoma, CA 95476-0259 <br /> Attention Matt Donohue QC Sample Group 6080569-70 Reported Aug 20, 1996 <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 B Williams B Williams B Williams B Williams <br /> Concentration <br /> Spiked 2 0 mg/m3 2 0 mg/m3 2 0 mg/m3 6 0 mg/m3 <br /> LCS Batch# LCS081696 LCS081696 LCS081696 LCS081696 <br /> Date Prepared 08/16/95 08/16/96 08/16/96 08/16/96 <br /> Date Analyzed 08/16/96 08/16/96 08/16/96 08/16/96 I <br /> Instrument I D # GCHP-7 GCHP-7 GCHP 7 GCHP 7 <br /> LCS % <br /> Recovery 100 103 102 104 <br /> Control Limits 70-130 70-130 70-130 70-130 <br /> MS/MSD <br /> Batch# BS081696 BS081696 BS081696 BS081696 <br /> Date Prepared 08/16/96 08/16/96 06/16/96 08/16/96 <br /> Date Analyzed 08/16/96 08/16/96 08/16/96 08/16/96 <br /> Instrument I D # GCHP-7 GCHP-7 GCHP-7 GCHP-7 <br /> Matrix Spike <br /> % Recovery 100 103 102 104 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 98 100 99 101 <br /> Relative % <br /> Difference 20 29 30 29 <br /> (of <br /> EQUOIA ANALYTICAL Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> �J,%L,1 �, c yl i� [ry preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> i a /�1�� 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 batch results <br /> Project Manager/Sacramento Laboratory <br /> 6080569 ENV <2> <br />