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■ , 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 (5 t0)686 9689 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> ISRESNA Client Project ID OW0309 01, Gardner Property <br /> P Y <br /> 1710 Main Street Matrix Liquid <br /> Escalon, CA 95320 <br /> Attention Tom Lutterman QC Sample Group 4FF9701-03 Reported Jul 8, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst. T Granlcher T Granlcher T Granicher T Granocher <br /> MS/MSD <br /> Batch#- 4FE5509 4FE5509 4FE5509 4FE5509 <br /> Date Prepared - _ _ <br /> Date Analyzed: 6/29/94 6/29/94 6/29/94 6/29/94 <br /> Instrument I D # GCHP-6 GCHP-6 GCHP-6 GCHP-6 <br /> Conc Spiked 10lig/L 10ug/L 10pg/L 30yg/L <br /> Matrix Spike <br /> % Recovery 100 100 100 100 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 110 110 110 110 <br /> Relative% <br /> Difference 95 95 95 95 <br /> LCS Batch# - - - <br /> Date Prepared <br /> Date Analyzed. <br /> Instrument I D # _ <br /> LCS % <br /> Recovery - - _ . <br /> Recovery <br /> Control Limits 71-133 72 128 72-130 71-120 <br /> Please Note <br /> The LCS is a control sample of known, interferent free matrix that 1s analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL preparation,and analytical methods employed for the samples The matrix spike 1s an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> V <br /> Vickie Tague Clark interference,the LCS recovery 1s to be used to validate the batch <br /> Project Manager 4FF9701 WAT <2> <br />