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,J Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 1900 Bates Avenue Suite L Concord CA 94520 (510) 686 9600 FAX(510)686 9689 <br /> low Analytical 819 Stnkcr Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br />*West, Inc Client Project ID Shell, 141 N EI Dorado, Stockton, CA <br /> 50 Melody Lane, Ste 160 Matnx Air <br /> )seville, CA 95678 <br /> tention Paul Graff QC Sample Gaup 5010975-977 Reported Feb 7, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYT 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 mg/m3 2 0 mg/m3 2 0 mg/m3 6 0 mg/m3 <br /> LCS Batch# LCS020195 LCS020195 LCS020195 LCS020195 <br /> Date Prepared 2/1/95 2/1/95 2/1/95 2/1/95 <br /> We Analyzed 2/1/95 2/1/95 2/1/95 2/1/95 <br /> strument I D.# GCHP-2 GCHP-2 GCHP-2 GCHP 2 <br /> LCS % <br />• Recovery 97 97 98 97 <br /> Control Limits 75-125 75-125 75 125 75 125 <br /> MS/MSD <br /> Batch # BLK020195 BLK020195 BLK020195 BLK020195 <br /> Date Prepared 2/1/95 2/1/95 2/1/95 2/1/95 <br /> )ate Analyzed 2/1/95 2/1/95 2/1/95 2/1/95 <br /> strument i D.# GCHP-2 GCHP-2 GCHP 2 GCHP 2 <br /> Matrix Spike <br /> % Recovery 97 97 98 97 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 96 95 96 96 <br /> Relative% <br /> Difference 1 0 21 21 1 a <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 /> / 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 QC limas for MS/MSDs are advisory only <br /> Inda C Schneider and are not used to accept or reject batch results <br /> rolect Manager <br /> 5010975 FUG -2. <br />