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a i ` Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 1900 Bates Avenue Suite L Concord CA 94.520 (510) 686 9600 FAX (510) 686 9689 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916) 921 0100 <br /> RESNA Client Project ID 150047 01, Ekholm Property <br /> 1710 Main Street Matrix Liquid <br /> Escalon, CA 95324 <br /> Attention John Lane OC Sample Group 4F94401-04 Reported Jun 28, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes Diesel <br /> Benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015 <br /> Analyst J Minkel J Minkel J Minkel J Minkel A.Nagra <br /> MS/MSD <br /> Batch#. 4FS6903 41786903 4F86903 4FS6903 4F94403 <br /> Date Prepared - - - - 6/20/94 <br /> Date Analyzed 6/16/94 6/16/94 6/16/94 6/16/94 6/21/94 <br /> Instrument I D # GCHP-17 GCHP-17 GCHP-17 GCHP-17 GCHP-5 <br /> Conc. Spiked 10,ug/L 10Erg/L 101ig/L 30 jrg/L 600 ug/L <br /> Matnx Spike <br /> % Recovery: 100 100 110 107 70 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 100 110 100 103 73 <br /> Relative % <br /> Difference 00 95 95 38 42 <br /> v i r ,. '.r .. r r l r rrr ♦ .. .. r .. r r n} .r.. y v. .. <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 28-122 <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 preparation,and analytical methods employed for the samples The matrix spike is 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 /> interference,the LCS recovery is to be used to validate the batch <br /> Vickie Tague Clark <br /> Project Manager 4F94401 WAT <3> <br />