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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br /> (415) 364-9600 • FAX (415) 3649233 <br /> I <br /> RESNA Client Project ID W2102 00, Tri Valley Growersµ <br /> 1710 Main Street Matrix Water <br /> Escalon, CA 95320 <br /> Attention Lois Frantz CC Sample Group 3L54001-2 Reported 4 Dee20, 1993 <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: A.Tuzon A.Tuzon A.Tuzon k Tuzon <br /> MS/MSD <br /> Batch# 3120743 3120743 3120743 3120743 <br /> Date Prepared 12/15/93 12/15/93 12/15/93 12/15/93 <br /> Date Analyzed 12/15/93 12/15/93 12/15/93 12/15/93 <br /> Instrument I D # GCHP-4 GCHP-4 GCHP-4 GCHP-4 <br /> Conc Spiked. 20pg/L 20pg/L 20pg/L 60pg/L <br /> Matrix Spike <br /> % Recovery 97 98 100 100 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 99 99 97 95 <br /> Relative% <br /> Difference. 20 10 30 51 <br /> LCS Batch# LCS121593 LCS121593 LCS121593 LCS121593 <br /> Date Prepared- 12/15/93 12/15/93 12/15/93 12/15/93 <br /> Date Analyzed. 12/15/93 12/15/93 12/15/93 12/15/83 <br /> Instrument 1 D,#• GCHP-4 GCHP-4 GCHP-4 GCHP-4 <br /> LCS% <br /> Recovery: 90 90 91 92 <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 is analyzed using the same reagents, <br /> 10SEQUOIA ANALYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> Lfortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> �} 2Tagg"e <br /> the recovery of analytes from the matrix spike does not fall within specified control emits due to matrix <br /> interference,the LCS recovery+s to be used to validate the batchVickie <br /> Project Manager 31-54001 WAT 42> <br />