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• /� '� '\ Sequoia 680 Chesapeake Drive RedwoodCity CA 94063 415) 364 9600 FAX(415) 364 9233 <br /> y ^�� 1900 Bates Avenue Suite L Concord CA 94520 <br /> Analytical (510} 686 9600 FAX(SIO) 686 9689 <br /> 819 Straker Avenue Suite 8 Sacramento CA 95834 1916} 921 9600 FAX(916)921 0100 <br /> 406rown &Caldwell Client Project ID Arco 434-94-5, Lodi <br /> 9616 Micron Avenue, Suite 600 Matrix Air <br /> Sacramento, CA 95827 <br /> Attention Mindy Wright OC Sample Group 4070249-251, 255-256 Reported Jul 19, 1994 <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 J Minkel J Minkel J Minkel J Minkel <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch# N/A N/A N/A N/A <br /> Date Prepared N/A N/A N/A N/A <br /> Date Analyzed N/A N/A N/A N/A <br /> Instrument I D # N/A N/A N/A N/A <br /> LCS <br /> Recovery N/A N/A N/A N/A <br /> Control Limits 71-133 72-128 72-130 71-120 <br /> MS/MSD <br /> Batch# 9407066-015 9407066-015 9407066015 9407066-015 <br /> Date Prepared N/A N/A N/A N/A <br /> Date Analyzed 7/7/94 7/7/94 7/7/94 7/7/94 <br /> Instrument I D # GCHP-20 GCHP 20 GCHP 20 GCHP-20 <br /> Matrix Spike <br /> %Recovery 92 92 92 90 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 96 97 97 97 <br /> Relative % <br /> Difference 43 53 53 75 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> 0( l L C 1 f preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> lJ� validation of sample batch results Due to matrix effects,the QC limits for MS/MSDs are advisory only <br /> Craig C e and are not used to accept or reject batch results <br /> Project Manager <br /> 4070247 ERS <4> <br />