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j Sequoia 680 Chesapeake Drive Redwood City CA 94063 <br /> p (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 Straker Avenue Suite a Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> RESNA Client Project ID 1 AY <br /> saoo2 Oa, Laidlaw <br /> 1710 Main Street Matrix Liquid <br /> Escalon, CA 95320 <br /> Attention John Lane OC Sample Group 4E32203 w Reported May 19, 1994 <br /> rr <br /> M r, fih rvv, rr <br /> 'A <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 J Fontcha J Fontcha J Fontcha J Fontcha <br /> MS/MSD <br /> Batch# 4050401 4050401 4050401 4050401 <br /> Date Prepared: 5/11/94 5/11/94 5/11/94 5/11/94 <br /> Date Analyzed, 5/11/94 5/11/94 5/11/94 5/11/94 <br /> Instrument I D # GCHP-4 GCHP-4 GCHP-4 GCHP-4 <br /> Cone Spilled: 20ug/L 20ug/L 20ug/L song/L <br /> Matrix Spike <br /> % Recovery. 70 90 95 97 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 70 , 85 90 95 <br /> Relative% <br /> Difference- 00 5 7 54 21 <br /> Y <br /> r <br /> } <br /> LCS Batch#: 2LCS051194 2LCS051194 2LCS051194 2LCS051194 <br /> Date Prepared- 5/11/94 5/11/94 5/11/94 5/11/94 <br /> Date Analyzed 5/11/94 5/11/94 5/11/94 5/11/94 <br /> Instrument I D #: GCHP-4 GCHP-4 GCHP4 GCHP-4 <br /> LCS % <br /> Recovery. 71 88 93 95 <br /> %Recovery <br /> Control Limits 71-133 72-128 72-130 71-120 <br /> Please Note <br /> SEQUOIA ANALYTICAL The LCS is a control sample of known,Interferent free matrix that Is analyzed using the same reagents, <br /> ELAP#1271 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 4E32201 wAT <3> <br />