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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 4D 1900 Sates Avenue Suite L Concord CA 94520 (510) 686 9600 FAX(510) 686 9689 <br /> 1W Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (9t6) 921 9600 FAX(9 16) 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 Avo Avedessian QC Sample Group 408091 3-91 9 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 A Tuzon A Tuzon <br /> MS/MSD <br /> I Batch# 4080905 4080905 4080905 4080905 <br /> Date Prepared 8/24/94 8/24/94 8/24/94 8/24/94 <br /> Date Analyzed 8/24/94 8/24/94 8/24/94 8/24/94 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 <br /> Cone Spiked 20Ng/L 20pg/L 20Ng/L 60pg/L <br /> Matrix Spike <br /> % Recovery 95 95 100 105 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 95 95 100 102 <br /> Relative% <br /> Difference 0 0 00 00 29 <br /> LCS Batch# 1 LCS082494 1 LCS082494 1 LCS082494 1 LCS082494 <br /> Date Prepared 8/24/94 8/24/94 8/24/94 8/24/94 <br /> Date Analyzed 8/24/94 8/24/94 8/24/94 8/24/94 <br /> Instrument I D # HP-2 HP-2 HP-2 HP 2 <br /> LCS % <br /> Recovery 105 106 114 112 <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 /> 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 /> OSignature 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 <4> <br />