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Sequoia 680 Chesapeake Drive Redwood City, CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> PDS Services Client Project 117 Unocal #2859, 1665 Pacific Ave, Stockton <br /> 2401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Sarkis Karkarian QC Sample Group 5082062-064 Reported Aug 31, 1995 <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 K Nill K Nill, K Nill K Nill <br /> MS/MSD <br /> Batch# 5081591 5081591 5081591 5081591 <br /> Date Prepared 8/29/95 8/29/95 8/29/95 8/29/95 <br /> Date Analyzed 8/29/95 8/29/95 8/29/95 8/29/95 <br /> Instrument I D# HP-2 HP-2 HP-2 HP-2 <br /> Conc Spiked 20pg/L 20pg/L 20pg/L 60pg/L <br /> Matrix Spike <br /> % Recovery 125 130 135 137 <br /> . Matrix Spike <br /> Duplicate% <br /> Recovery 120 125 130 132 <br /> Relative% <br /> Difference 41 39 3 8 37 <br /> LCS Batch# 1 LCS082995 1 LCS082995 1 LCS082995 1 LCS082995 <br /> Date Prepared 8/29/95 8/29/95 8/29/95 8/29/95 <br /> Date Analyzed 6/29/95 8/29/95 8/29/95 8/29/95 <br /> Instrument I D # HP-2 HP 2 HP-2 HP 2 <br /> LCS% <br /> Recovery 110 112 117 118 <br /> ecovery <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 /> SEQUOIA ANALYTICAL,#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 /> Wignature on File the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> Alan B Kemp <br /> interference,the LGS recovery is to be used to validate the batch <br /> ' <br /> Project Manager <br /> 5082062 MPD <3> <br />