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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> t900 Bates Avenue Suite L Concord,CA 94520 (510) 686 9600 FAX(510)686 9689 <br /> %07 Analytical 819 Striker Avenue Suite 8 Sacramento, CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> *MPDS Services Client Project ID Unocal #0187, 437 E Miner Ave , Stockton <br /> 2401 Stanwell Dr, Ste 400 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Avo Avedessian OC Sample Group 4111336-338 Reported Dec 5, 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 /> Batch# 4111339 4111339 4111339 4111339 <br /> Date Prepared 12/1/94 12/1/94 12/1/94 12/1/94 <br /> Date Analyzed 12/1/94 12/1/94 12/1/94 12/1/94 <br /> Instrument 1 D # HP-5 HP-5 HP-5 HP-5 <br /> Conc Spiked 20,ug/L 20pg/L 20pg/L 60ug/L <br /> Matrix Spike <br /> %Recovery 100 105 105 103 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 100 105 105 103 <br /> Relative% <br /> Difference 00 00 00 00 <br /> LCS Batch# 3LCS120194 3LCS120194 3LCS120194 3LGS120194 <br /> Date Prepared 12/1/94 12/1/94 12/1/94 12/1/94 <br /> Date Analyzed 12/1/94 12/1/94 12/1/94 12/1/94 <br /> Instrument I D # HP-5 HP-5 HP-5 HP-5 <br /> LCS % <br /> Recovery 99 106 111 109 <br /> ecovery <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 /> Ognature on File the recovery of anaiytes 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 /> 4111336 MPC <4> <br />