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4 <br /> 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 /> 4RPDS Services Client Project ID Unocal #0123, 1034 Central Ave , Tracy <br /> 2401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Jarrel Crider OC Sample Group 5120563-568 Reported Dec 28, 1995 <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 S Chullakorn S Chullakorn S Chullakorn S Chullakorn J Dinsay <br /> MS/MSD <br /> Batch# 5120585 5120585 5120585 5120585 BLK121395 <br /> Date Prepared 12/18/95 12/18/95 12/18/95 12/18/95 12/13/95 <br /> Date Analyzed 12/18/95 12/18/95 12/18/95 12/18/95 12/14/95 <br /> Instrument I D # HP-9 HP-9 HP-9 HP 9 GCHP-3A <br /> Conic Spiked 20ug/L 20Ng/L 20ug/L 60ug/L 300 ug/L <br /> Matrix Spike <br /> % Recovery 95 100 100 115 97 <br /> . Matrix Spike <br /> Duplicate % <br /> Recovery 95 105 105 120 110 <br /> Relative% <br /> Difference 00 49 4 9 43 13 <br /> LCS Batch# 4LCS121895 4LCS121895 4LCS121895 4LCS121895 LCS121395 <br /> Date Prepared 12/18/95 12/18/95 12/18/95 12/18/95 12/13/95 <br /> Date Analyzed 12/18/95 12/18/95 12/18/95 12/18/95 12/14/95 <br /> Instrument 1 D # HP 9 HP 9 HP 9 HP-9 GCHP-3A <br /> LCS % <br /> Recovery 100 110 110 125 100 <br /> Recovery <br /> Control Limits 71-133 72 128 72-130 71 120 38-122 <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, #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 /> Oignature on File 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 /> Alan B Kemp <br /> Project Manager <br /> 5120563 MPD <7> <br />