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Sequoia 580 Chesapeake Dnve Redwood City,CA 9406 (415) 364 9600 FAX(415) 364 9233 <br /> �"V y 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> X11,1 Analytieax 819 Sinker Avenue,Sane 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br />' <br /> MPDS Services Client Project ID Unocal #0123, 1034 Central Ave, Tracy <br /> Y <br /> 2401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Sarkis Karkarlan QC Sample Group 5060155-57 Reported Jun 19, 1995 <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 J Fontecha J Fontecha J Fontecha J Fontecha <br />' MS/MSD <br /> Batch# 5060158 5060158 5060158 5060158 <br />' Date Prepared 6/6/95 6/6/95 6/6/95 6/6/95 <br /> Date Analyzed 6/6/95 6/6/95 6/6/95 6/6/95 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 <br /> Conc Spiked 20pg/L 20)ag/L 20ug/L 50ug/L <br /> Matrix Spike <br /> % Recovery 105 105 115 112 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 120 120 125 127 <br /> Relative % <br /> Difference' 13 X13 1 r 4 e 3 13 <br /> J. l . ., + v yr v • +i ~ r r In <br /> LCS. Batch# 1 LCS060695 1 LCS060695 1 LCS060695 1 LCS060695 <br />' Date Prepared- 6/6/95 6/6/95 6/6/95 6/6/95 <br /> Date Analyzed 6/6/95 6/6/95 6/6/95 6/6/95 <br /> instrument I.D #. HP-2 HP-2 HP-2 HP-2 <br />' LCS % <br /> Recovery 113 114 121 120 <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 /> Signature an 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 /> -- - 5060155 MPD <9> <br />