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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 Stnker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 96W FAX(916)921 4100 <br /> *PDS Services Client Project ID Unocal #0187, 437 Miner Ave Stockton <br /> 1 Ave , <br /> Stockton <br /> Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Jarrel Crider OC Sample Group 6020403-414 Reported Feb 23, 1996 <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 L Huang L Huang L Huang L Huang <br /> MS/MSD <br /> Batch# 6020413 5020413 6020413 6020413 <br /> Date Prepared 2/17/96 2/17/96 2/17/96 2/17/96 <br /> Date Analyzed 2/17/96 2/17/96 2/17/96 2/17/96 <br /> Instrument I D # HP-9 HP-9 HP-9 HP-9 <br /> Cone Spiked 2oug/L 20ug/L 20pg/L 60ug/L <br /> Matrix Spike <br /> % Recovery 115 110 105 113 <br />• Matrix Spike <br /> Duplicate % <br /> Recovery 110 110 105 112 <br /> Relative % <br /> Difference 19 19 18 57 <br /> LCS Batch# 4LCS021796 4LCS021796 4LCS021796 4LCS021796 <br /> Date Prepared 2/17/96 2/17/96 2/17/96 2/17/96 <br /> Date Analyzed 2/17/96 2/17/96 2/17/96 2/17/96 <br /> Instrument I D # HP-9 HP-9 HP-9 HP-9 <br /> LCS % <br /> Recovery 95 95 90 95 <br /> Recovery <br /> Control Limits 71-133 72-128 72-130 71-120 <br /> Please Note <br /> The LCS 1s 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 1s 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 /> Alan B Kemp interference,the LCS recovery is to be used to validate the batch <br /> Project Manager <br /> 6020403 M PD <4> <br />