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- \ Sequoia . 680 Chesapeake Drive Redwood City CA 94 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget lane Walnut Creek CA 945 (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 /> lopgradient Client Project ID Apache Plastics <br /> 1017 26th St Matrix Air <br />' Sacramento, CA 95816 <br /> Attention Vic Cherven QC Sample Group 512-0298 Reported Dec 19, 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 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# LCS120895 LCS120895 LCS120895 LCS120895 <br />' Date Prepared 12/8/95 12/8/95 12/8/95 12/8/95 <br /> Date Analyzed 12/8/95 12/8/95 12/8/95 12/8/95 <br /> Instrument I D # GCHP 2 GCHP-2 GCHP 2 GCHP 2 <br /> LCS % <br /> Recovery 100 100 100 100 <br /> Control Limits 75-125 75 125 75-125 75-125 <br /> J <br />' MS/MSD <br /> Batch # BS120895 ES120895 BS120895 BS120895 <br /> Date Prepared 12/8/95 12/8/95 12/8/95 12/8/95 <br /> Date Analys=ed 12/8/95 12/8/95 12/8/95 12/8/95 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP 2 GCHP 2 <br /> ' Matrix Spike <br /> % Recovery 100 100 100 1oa <br /> ' Matrix Spike <br /> Duplicate % <br /> Recovery 95 95 95 95 <br /> Relative % <br /> Difference 51 51 51 51 <br /> ' Please Note <br /> The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents <br /> SEQUOIA ANALYTICAL preparatoon and analytical methods employed for the samples The LCS%recovery data is used for <br /> validation of sample batch results Due to matrix effects the QC limits for MS/MSD s are advisory only <br /> and are not used to accept or reject batch results <br /> Janet arlan <br /> ' Project Manager <br /> 5120298 LIPS <3- <br /> 1 <br />