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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> ID 404 N W,get Lane Walnut Creek,CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Vl-F Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> O <br /> MPDS Services Client Project ID Unocal #6981, 4707 Pacific Ave, Stockton <br /> 2401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Jarrel Crider QC Sample Group 6071861-872 Reported Aug 7, 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 S Chullakorn S Chullakorn S Chullakorn S Chullakorn <br /> MS/MSD <br /> Batch# 6071310 6071310 6071310 6071310 <br /> Date Prepared 7/29/96 7/29/96 7/29/96 7/29/96 <br /> Date Analyzed 7/29/96 7/29/96 7/29/96 7/29/96 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 <br /> Cone Spiked 20pg/L 20ug/L 20frg/L 60ug/L <br /> Matrix Spike <br /> % Recovery 115 110 115 112 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 100 95 100 100 <br /> Relative % <br /> Difference 14 15 14 11 <br /> LCS Batch# 2LCS072996 2LCS072996 2LCS072996 2LCS072996 <br /> Date Prepared 7/29/96 7/29/96 7/29/96 7/29/96 <br /> Date Analyzed 7/29/96 7/29/96 7/29/96 7/29/96 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 <br /> LCS % <br /> Recovery 110 105 115 107 <br /> % ecovery <br /> Control Limits 70-130 70-130 70-130 70-130 <br /> Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> 4iEQUOIA 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 subfected to the entire analytical procedure If <br /> Signature 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 /> 6071861 MPD <6> <br />