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q} Sequoia 0680 Chesapeake Drive Redwood City,CA 94060D(415) 364 9600 FAX(415) 364 9233 <br /> 1900 Bates Avenue Suite L Concord,CA 94520 (510) 686 9600 FAX(510) 686 9689 <br /> „�► Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)931 0100 <br /> 14radient Client Project ID Apache <br /> 3369 Kimberly Rd Matrix Air <br /> Cameron Park, CA 95682 <br /> Attention Clyde Hebbrom OC Sample Goup 503-0257 Reported Mar 20, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 8020 EPA 6020 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# LCS030395 LCS030395 LCS030395 LCS030395 <br /> Date Prepared 3/3/95 3/3/95 3/3/95 3/3/95 <br /> Date Analyzed 3/3/95 3/3/95 3/3/95 3/3/95 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> LCS <br /> Recovery 65 65 90 87 <br /> Control Limits 75 125 75-125 75-125 75 125 <br /> MS/MSD <br /> Batch# 13LK030395 13LK030395 BLK030395 BLK030395 <br /> Date Prepared 3/3/95 3/3/95 3/3/95 3/3/95 <br /> Date Analyzed 3/3/95 3/3/95 3/3/95 3/3/95 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> % Recovery 85 85 90 87 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 85 85 90 92 <br /> Relative% <br /> Difference 00 00 00 55 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LCS 1s a control sample of known,interferent free matrix that 1s 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 limits for MS/MSD's are advisory only <br /> Jennie Higgins and are not used to accept or reject batch results <br /> Project Manager <br /> 5030256 UPG <2> <br />