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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (4151 364 9600 FAX(415)364 9233 <br /> 1900 Batts Avenue,Suite L Concord CA 94520 (510) 686 9600 FAX(510)686 9689 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> ' MPDS Services Client Project ID Unocal #2859, 1665 pacific Ave,Stockton <br /> 2401 Stanwell Dr, Ste 400 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Arco Avedesslan QC Sample Group 4080913-919 Reported Aug 30, 1994 <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 k Tuzon A.Tuzon <br /> MS/MSD <br /> Batch# 4081035 4081035 4081035 4081035 <br /> Date Prepared 8/25/94 6/25/94 8/25/94 8/25/94 <br /> Date Analyzed 8/25/94 8/25/94 8/25/94 8/25/94 <br /> Instrument I.D # HP-4 HP-4 HP-4 HP4 <br /> Conc Spiked 20pg/L 20pg/L 201.rg/L 60pg/L <br /> Matrix Spike <br /> . % Recovery 80 85 90 93 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 80 90 90 93 <br /> Relative % <br /> Difference 00 57 00 00 <br /> LCS Batch# 2LCS082594 2LCS082594 2LCS082594 2LCS082594 <br /> Date Prepared 8/25/94 8/25/94 8/25/94 8/25/94 <br /> Date Analyzed 8/25/94 8/25/94 8/25/94 8/25/94 <br /> instrument I D # HP-4 HP-4 HP-4 HP-4 <br /> LCS % <br /> Recovery 85 95 100 102 <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 /> 14WEQUOIA 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 H <br /> Signature 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 /> 4080913 MPD <6> <br />